CN102242512A

CN102242512A - Environmentally-friendly paper making and pulping technique and system with high yield

Info

Publication number: CN102242512A
Application number: CN2011101115333A
Authority: CN
Inventors: 李刚荣; 李军
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-04-30
Filing date: 2011-04-30
Publication date: 2011-11-16
Also published as: CN102817262B; CN102817262A

Abstract

The application of the invention provides an environmentally-friendly paper making and pulping technique with high yield, which comprises a raw material preprocessing stage, a physical fibrillation impregnating processing stage, an impregnating, steaming and bleaching three-section integrated pulping stage and a thickening and dewatering processing stage. An environmentally-friendly paper making and pulping system with high yield realizing the pulping technique comprises a stock cutter, a hammering and fibrillation screening dust remover, a washing dust remover, dewatering conveying equipment, a spiral steaming conveyor, a crashing, extruding and impregnating machine, a stirring and impregnating cabin, a pump pipe and a discharge pipe of a high-enriched steaming, bleaching and pulping all-in-one machine, wherein the pump pipe is connected to the high-enriched steaming bleaching pulping all-in-one machine; the discharge pipe of the high-enriched steaming, bleaching and pulping all-in-one machine is connected to a pulp cabin; the pump pipe of the pulp cabin is connected with a thickening and dewatering machine; the thickening and dewatering machine is output to the high-enriched pulping machine; the output of the high-enriched pulping machine is connected with a screening purifier and a thickening and squeezing machine in sequence. In the invention, the problems of high pollution, high energy consumption, serious shortage of paper making raw material and the like in present pulping and paper making industry can be solved fundamentally; rich plant fiber in the nature can be used, and the technical purposes of efficient bleaching, high yield, no black liquor and low energy consumption can be realized.

Description

High yield environmental protection paper-making pulping process method and pulping system thereof

Technical field

What the present patent application related to is paper-making pulping process method and process system thereof, especially is suitable for the careless class of annual non-wood fiber, paper-making pulping process method and system's composition thereof of agricultural crop straw class plant material.

Background technology

Comprise cellulose, hemicellulose, lignin and pectin etc. in the plant material that paper-making pulping is used.The careless class of annual non-woody fiber, agricultural crop straw class are for xylophyta, non-fibre fractionations such as fiber fines is many, silicone content is high, ash is big, pentosan content height, heteroproteose cell are many and complicated, self color is dark, lignin structure complexity wherein, content height, the content of lignin and derivative thereof can reach 30-60%, the component that is considered to not have value in the paper-making pulping industry must be done the removal processing to lignin and derivative thereof in pulping process is handled.

Technical problems such as existing pulping technology for paper-making ubiquity yield is low, energy consumption is high, seriously polluted.Several big operations such as its alkaline paper-making pulping technique includes blank, dedusting, boiling, washing, screening and bleaching, concentrate.The core of soda pulping process is boiling and bleaching, and cooking process wherein is the most key.The quality of washing quality also can influence pulping yield.That prior art still generally adopts is high-alkali, high temperature, autoclaving method is lignin stripping as much as possible, and the liquid of extruding of boiling slurry is black liquor, is difficult to reclaim.The carrying out and the quality of operations such as boiling technology affects screening greatly, bleaches and concentrates.High-alkali, the boiling of high temperature and high pressure condition, its conventional highly basic consumption is the 8-18% of plant material weight, boiling temperature is 155-185 ℃, pressure reaches 0.6-0.8MPa, the lignin of stripping exists with the alkali lignin form in the cooking waste liquor, the silicone content height, cause cooking waste liquor viscosity big, the color dark, increased bleaching, the technology difficulty that evaporation and concentration and alkali reclaim, high temperature, high pressure, high-alkali cooking schedule is in the stripping lignin, also make more cellulose degradation and run off, cause boiling, washing, screening process produces large amount of sewage, and suspended matter in the sewage and organic concentration height, viscosity is big, high-alkali, the color and luster dark, biodegradability is poor, the fibre stream vector is big.The operation between boiling operation in early stage, boiling and the bleaching of existing soda pulping process technology and boiling, the bleaching process of core almost do not have any relevance, they are just done some simple physics for core process and cut off and cleaning, technostress all concentrates on this section of boiling operation, thereby is difficult to take into account multi-faceted specification requirement.Alkali recovery technology in the above-mentioned pulping process method is comparatively ripe for woody paper-making pulping black liquor, but then there is very big technology barrier for draft raw material paper-making pulping process black liquor, its reason is silicon component content height in the waste liquid of straw pulp, viscosity is big, filterability is poor, when adopting the lime alkali reclaiming method, high content silicon can obviously reduce the availability of active lime, moreover mobile poor, be difficult to conveying, also can cause the carrier pipe scale problems.

Summary of the invention

The goal of the invention of patent application of the present invention is to provide a kind of high yield environmental protection paper-making pulping process method and pulping system thereof, and it is a kind of yield height, energy consumption is low, pollution-free and be suitable for xylophyta, be more suitable for the paper-making pulping process method and the pulping system of nonwood plant raw material.

The high yield environmental protection paper-making pulping process method that patent application of the present invention provides, its technical scheme is to the effect that: a kind of high yield environmental protection paper-making pulping process method comprises pretreatment of raw material section, physics silk impregnation process section, soaks to steam and float three sections one slurrying sections and thickening processing section; The percentage that medicament is wherein formed is to account for the percentage amounts that plant material is determined weight;

1., the pretreatment of raw material section: plant material through cut off, beat silkization and remove silt particle and the slag thing after, add the preimpregnation soup, be 60-80 ℃ of dipping 5-10 minute down in temperature, dewater, feed decatize enforcement again and softened 5-10 minute; Described preimpregnation soup comprises neopelex 0.02～0.08%, NaOH 0.3～0.8%, chelating agent 0.25～0.6%, bleeding agent fatty alcohol-polyoxyethylene ether JFC 0.025～0.1%, and wherein chelating agent is one of any among EDTA or the DTPA;

2., physics silk impregnation process section: 1. a section material is sent into the squeeze crack machine, is ground, tears, crumples and be the staple shape by powerful squeezing, and injects when beginning to become the staple shape or having become the staple shape and floods medicament; Described dipping medicament includes neopelex 0.02～0.15%, NaOH 2～3.5%, chelating agent 0.15～0.35%, wherein chelating agent be EDTA or in one of any;

3., soak steaming and float three sections one slurrying sections: 2. a section dipping material is sent into high-concentration boiling and bleaching slurrying all-in-one, by the 2. liquid matter of section in the material of filtering in the high-concentration boiling and bleaching slurrying all-in-one, come into effect slaking successively, steam and float reaction and bleaching action, the slaking period: inject the slaking medicament to all-in-one, under 80-100 ℃ of temperature, 0.1-0.3MPa pressure condition slaking 60-90 minute; It is that oxygen floats delignification's reaction period that the reaction period is floated in steaming: inject to steam to all-in-one and float medicament, and aerating oxygen, under 80-100 ℃ of temperature, 0.3-0.5MPa pressure condition, steam and float reaction 30-90 minute; The bleaching action period, need to divide two-four sections to inject oxygen successively and float medicament, keep the 0.3-0.5MPa oxygen pressure, under 70-90 ℃ of temperature conditions bleaching action 30-60 minute, be to be that power is drained slurry during discharge with the oxygen enrichment air pressure of putting aside in the all-in-one, described slaking medicament includes NaOH 1.5～3%, magnesium sulfate 0.1～0.5%, sodium metasilicate 1～3.5%, sodium sulfite 0.5～1.5%, oxygen floats agent 0.5～1.5%, described steaming is floated medicament and is comprised chelating agent 0.25～0.6%, NaOH 1～3%, magnesium sulfate 0.2～1%, sodium metasilicate 1.5～3.5%, oxygen floats agent 2～4%, chelating agent wherein be EDTA or in one of any, described oxygen floats medicament and comprises magnesium sulfate 0.1～0.5%, sodium metasilicate 2～6%, oxygen floats agent 3～5%, and wherein to float agent be SODIUM PERCARBONATE to oxygen, sodium peroxide, hydrogen peroxide, carbamide peroxide, at least a in the peracetic acid;

4., the thickening processing section: by dehydration concentrator press dewatering, again through defibrination, screening, purification, adjust commercial pulp.

Patent application of the present invention also provides the high yield environmental protection paper-making pulping of realizing above-mentioned high yield environmental protection paper-making pulping process method system, this system includes stock-cutter successively by the technology circuit, the hammer bolting silk selects dust removal machine, clean dust removal machine, the dehydration conveying equipment, the decatize conveying worm, the squeeze crack machine, stir impregnation bin, pump line is connected to high-concentration boiling and bleaching slurrying all-in-one, drainage conduit is connected to pulp bin again, the pulp bin pump line connects the thickening machine, the thickening machine exports high-density paste mill to, high-density paste mill output connects screening clearing machine and concentration squeezing machine successively, the preimpregnation drug liquid tube feeds and cleans dust removal machine and decatize screw machine, dipping medicament pipe feeds squeeze crack machine, slaking medicament, steaming is floated medicament and oxygen and is floated the medicament pipe and feed high-concentration boiling and bleaching slurrying all-in-one at times.

In the above-mentioned high yield environmental protection paper-making pulping system, hammer bolting silk wherein selects dust removal machine can select railroad duster, bipyramid dust removal machine or cyclopneumatic separator for use, can also select multi-functional minute bolting silk blanking dirt all-in-one for use.Some roads beaming roller that this multi-functional minute bolting silk blanking dirt all-in-one had by parallel horizontal rotational support in the tunnel passage of charging aperture to the casing of discharging opening, evenly be set with the pin thorn of some quantity on the beaming roller surface, be articulated in interspersed being distributed in the middle of the pin thorn of hammer cutter of beaming roller, the beaming roller top is provided with sieve plate, the below is provided with down sieve plate, following sieve plate has the cambered surface of stinging and hammer into shape the setting of cutter maximal margin circular trace spacing with the beaming roller pin, and cambered surface is provided with some roads and is the bed plate that shearing cooperates with pin thorn and hammer cutter.

In the above-mentioned high yield environmental protection paper-making pulping system, squeeze crack machine wherein can be selected screw extrusion shredder, double helix fiberizer, kneading or grinding leaser, twin-screw roller type paste mill for use, can also adopt the squeeze crack impregnator.Rotational support is provided with two parallel engagement beaming rollers in the casing of this squeeze crack impregnator, charging aperture and discharging opening are separately positioned on the beaming roller two ends, select at least work section one, work section two and work one of in the section three and the quantity of selected work section be at least one group vertically assembled arrangement be arranged on each beaming roller; Described work section one is made of jointly the feed auger section and the section of rolling, the section of rolling is that axial multiple tracks rolls the dish composition, roll dish for having the cam that rolls arc outline, multiple tracks rolls disc radial and is crisscross arranged and constitutes the section of rolling, the spiral section clearance meshing of two rollers cooperates, and rolling of each respective shaft position of the section of rolling coiled staggered the cooperation; Described work section two is made of jointly feed auger section and grinding tooth dish section, and the grinding tooth dish is the multi-groove type sheave, and respectively encircling of grinding tooth dish evenly offers some skewed slots on the tooth, two rollers spiral section and the intersegmental crack of grinding tooth dish engagement fit; Described work section three is made of jointly feed auger section and reverse acting spiral section, evenly be provided with some skewed slots on the reverse thread tooth of reverse acting spiral section with respect to axioversion, the intersegmental crack of two rollers spiral section and reverse acting spiral engagement fit, medicament mouth or steam inlet are arranged at the segment ends of respectively working.

In the above-mentioned high yield environmental protection paper-making pulping system, it is the horizontal pulping tank of sealing with closed sandwich for described high-concentration boiling and bleaching slurrying all-in-one, have with the horizontal central line is the rotary drive mechanism of axis, the pulping tank upper center is provided with feeding-passage, the pulping tank inside of feeding-passage is arranged with the threeway of the mouth of pipe towards both sides, the pulping tank below is provided with leakage fluid dram, is laid on the pulping tank below and is provided with sieve plate; Pulping tank one end is provided with the laterally disposed discharge nozzle of the mouth of pipe; Pulping tank one end axis place is provided with the multichannel rotary valve, the multichannel rotary valve includes valve body and the rotary spool formation that rotatory sealing cooperates, spool is fixed on the pulping tank, the soup cavity connects spool central authorities, and be communicated with drug liquid tube in pulping tank, be evenly equipped with aperture on the drug liquid tube, being provided with the thermal source parallel with medicine liquid channel in the spool introduces cavity and draws cavity, the valve wall that valve body cooperates with valve core rotation is provided with thermal source and introduces annular groove and draw annular groove, corresponding with the corresponding annular groove respectively connection of each cavity, valve body is provided with the external pipeline that communicates with each annular groove, and the thermal source of external pipeline is gone into pipe and introduced cavity through thermal source successively, input pipe, the pulping tank interlayer, return pipe, thermal source is drawn cavity, external pipeline constitutes boiling and adds heat passage.

High yield environmental protection paper-making pulping process method and pulping system thereof that patent application of the present invention provides, change the technology prejudice that traditional alkaline paper-making pulping technique is considered as lignin in the discarded object that must remove, each step of its a whole set of process technology scheme is all linked with one another, earlier stage treatment process has all been made substantive contribution for the core processing section: 1. Duan pretreatment of raw material section, by the washing of preimpregnation soup dipping, the raw material of silkization has been beaten in preimpregnation, by penetrating agent JFC, surfactant neopelex and low-concentration sodium hydroxide aqueous solution swollen raw fiber, improve infiltration efficient, the fortifying fibre wettability and the uniformity, be the 2. the squeeze crack of section physics silk impregnation process section handle the condition of having created.In physics silk impregnation process section, the squeeze crack machine is unfavorable for raw material inside the non-fibre composition of slurrying in the silk material, as lignin, pectin, tannin, heteroproteose cell, ash, resins etc. comprise that also air is extruded, remove, eliminate the adverse effect of non-fibre fractionation to greatest extent to pulping process, the ability that is had strong absorption dipping medicament by squeeze crack silk material as compressed sponge, the dipping medicament is rapid, the deep fibrous inside that is impregnated into, in cell membrane, be exactly before the core pulping process, mass transport process with chemical reaction, specific area, permeability, the uniformitys etc. are all accomplished optimization, these all are that the 3. the step soaks to steam and floats three sections one slurrying sections and made sufficient preparation, digestion process also is the beginning of bleaching, at low alkali, the degraded loss that treatment process has significantly reduced hydrocarbon is floated in low temperature and steaming, has improved the bleachability of slurry to a certain extent.Soak steam float three sections one slurrying sections should be with lignin from fully stripping between cellulose, when guaranteeing the quality of cellulose own, the lignin of stripping is easy in pulping process by process modification and polymerization, polymerization becomes the slurry functional component or becomes copies the slurry papermaking filler, thereby utilize each type organic in the material to greatest extent, especially account for the lignin of total amount of organic 30-60%, after the slurrying of draft material, the negative effect that the pulp-making waste-water that no longer exerts an influence reclaims, and the dissolution rate of silicon also is significantly less than traditional soda pulping process technology, realizes efficiently bleaching, high yield, no black liquor, the technical purpose of low energy consumption.Lignin between string is mainly by methoxyl group-OCH3, base substance such as hydroxyl-OH and carbonyl-CO constitutes, this paper-making pulping process method is a kind of low alkalinity, under 70-100 ℃ the temperate condition free radical deep oxidation is reacted, each group modified monomer molecule that becomes with lignin, and activate into hydroxyl radical free radical HOO-and hydrophilic active oxygen radical O2-etc., destroy the chromophoric group in the lignin, color development system in the oxidation pigment, reach the technical purpose of colour killing bleaching, meanwhile, at low alkalinity pH is under the condition of 9-10.5, also causing oxygen floats agent such as H2O2 and generates OH ° of free radical and carry out the deep oxidation reaction, destroy pectic substance, two keys in wax and the nitrogen substance molecular structure, make it reduce between cellulose active force and remove, quickened phenylpropyl alcohol alkanes construction unit with carbon/carbon or ehter bond combination, make the monomer macromolecular compound lignin and the hemicellulose fully stripping from fibre wall that contain methoxyl group, the big molecule lignin of monomer contains two keys or covalent bond mostly, under medicament effects such as low alkalinity and surfactant, radical polymerization or free radical type copolyreaction take place, generate new lignin polyester, the lignin of stripping simultaneously is mainly with lignosulphonates, be that the sulfonated lignin form exists in solution, sulfonated lignin is compared with the alkali lignin of traditional highly basic high temperature pulping process stripping, its good water solubility, surface-activity is strong, under the media environment condition that is softened, more increased and other ion complexation, the probability of polymerization and modification, become the sulfonated lignin condensate, and be trapped in the slurry, reach the technical purpose that improves pulp yield.Lignin polymers or lignosulfonate condensate are used effectively as " adhesive " or " stuffing " in copying slurry papermaking.Not chloride in each medicament in the technical program, compositions such as sulphur, for environmentally friendly oxygen floats medicament, steaming is floated to separate out in the disposed slurry and is not contained organic chloride in the waste liquid; as poisonous and harmful carcinogens such as bioxin, and hemicellulose and modification have been kept to greatest extent, the lignin of polymerization is not dissolved, chromophoric group changes colourless group into, thereby the middle-stage wastewater contamination index that produces is low, be easy to handle, it is little to load, its part can be used for the material washing and the diluted slurry water of pretreatment of raw material section after simple filtering, the residue middle-stage wastewater is sent into wastewater treatment and is utilized system again, processing cost is low, but water qualified discharge after the processing or fully recovering are in pulping system.The low alkali oxygen of the employing of the technical program floats medicament, normal pressure or low-pressure, low temperature steams and floats reaction, and its paper pulp yield can reach 50-70%, whiteness 70-80%ISO.The technical program has solved especially that the nonwood plant slurrying difficulty that always perplexs people is big, wastewater flow rate is many, be difficult for reclaiming clean treatment technology problem, technical problem as annual straw fiber raw material paper-making pulping, the finished product paper pulp physical index of producing can meet and exceed the index of leaf wood chemical pulp, and fracture length can reach 6.94km.The technical program has fundamentally solved problems such as present pulping and papermaking industry high pollution, high energy consumption, paper making raw material be in short supply, utilize the abundant string of occurring in nature, particularly annual straw or like vegetable fiber can promote the cycling and reutilization and the sustainable development of agricultural resource.

The contrast table of the high yield environmental protection of the present invention paper-making pulping process method simultaneous interpretation controlling paste-making method is as follows:

High yield environmental protection paper-making pulping process method and traditional pulping process relevant parameter contrast table of the present patent application are as follows:

Description of drawings

The combination of Fig. 1 and Fig. 2 is the composition diagram of this high yield environmental protection paper-making pulping system

Fig. 3 and Fig. 4 are the main sectional structure chart of multi-functional minute bolting silk blanking dirt all-in-one and sectional structure chart radially

Fig. 5 and Fig. 6 are the front view and the vertical views of squeeze crack impregnator

Fig. 7 and Fig. 8 are the radial cross-section of the squeeze crack impregnator section of rolling

Fig. 9 and Figure 10 are the structure charts of squeeze crack impregnator grinding tooth section and reverse acting spiral section

Figure 11 is the structure chart of high-concentration boiling and bleaching slurrying all-in-one

Figure 12 and Figure 13 are the main cutaway view and the radial cross-section of the multichannel rotary valve of high-concentration boiling and bleaching slurrying all-in-one.

The specific embodiment

Disclosed high yield environmental protection paper-making pulping process method of patent application of the present invention and pulping system thereof, wherein realize the high yield environmental protection paper-making pulping system of high yield environmental protection paper-making pulping process method, include stock-cutter 1 successively by the setting of technology circuit, the hammer bolting silk selects dust removal machine 2, send into cleaning dust removal machine 4 by conveying equipment 3, through dehydration conveying equipment 5, decatize conveying worm 6, squeeze crack machine 7, send material to stirring impregnation bin 9 through conveying equipment 8, pump line is connected to high-concentration boiling and bleaching slurrying all-in-one 11, drainage conduit is connected to pulp bin 12 again, pulp bin 12 pump lines connect thickening machine 14, thickening machine 14 exports high-density paste mill 16 to, and high-density paste mill 16 outputs are sent into low dense fiberizer 19 successively through latency chest 10, screening clearing machine 22 and concentration squeezing machine 23 are adjusted slurry concentration and are got commercial pulp.Clean and add the preimpregnation medicament in the dust removal machine 4, preimpregnation medicament pipe feeds decatize conveying worm 6, dipping medicament pipe feeds squeeze crack machine 7, and the dipping medicament adds and stirs impregnation bin 9, the slaking medicament, steams and floats medicament and oxygen and float the medicament pipe and feed high-concentration boiling and bleaching slurrying all-in-one at times.Wherein clean dust removal machine 4, dehydration conveying equipment 5, decatize conveying worm 6, stir impregnation bin 9 genus wet method preimpregnation.

Stock-cutter wherein can be rotor formula chaffcutter, disk chipper or cut reed machine etc.

Hammer bolting silk wherein selects dust removal machine can increase hammering mechanism composition on the architecture basics that is railroad duster, bipyramid dust removal machine, cyclopneumatic separator, can also select multi-functional minute bolting silk blanking dirt all-in-one for use.The formation of this multi-functional minute bolting silk blanking dirt all-in-one is as shown in Figure 3 and Figure 4: the some roads beaming roller 30 that is had by parallel horizontal rotational support in the tunnel passage of charging aperture 31 to the casing of discharging opening 32, be provided with eight road beaming rollers in the present embodiment, constitute dust-collecting cavity 33 between the sieve plate of beaming roller 30 tops and the upper housing, dust-collecting cavity 33 is communicated with negative pressure mechanism.Evenly be set with the pin thorn 34 of some quantity on beaming roller 30 surfaces, the interspersed pin thorn 4 middle hammer cuttves 35 that are hinged on the beaming roller 30 that evenly are provided with that are distributed in, the top of described pin thorn 34 can be a spine, also can be the blunt top of circle.Beaming roller 30 belows are provided with down sieve plate 36, and following sieve plate 36 has with beaming roller pin thorn 34 and hammers the cambered surface that cutter 35 maximal margin circular trace spacings are provided with into shape, and cambered surface is provided with some roads and is the bed plate 37 that shearing cooperates with pin thorn 34 and hammer cutter 35.From charging aperture 31 to the rotation at a high speed that raises of going forward one by one successively of each beaming roller rotating speeds of discharging opening 32 directions.Raw material is advanced by a lot of beaming roller, 37 effects are broken, cut silk, beat, separate with bed plate by the hammer cutter 35 of each road beaming roller 30, pin thorn 34, the plaster of lightweight, the broken foam of leaf etc. are siphoned away by dust-collecting cavity 33 negative pressure on top, sieve aperture by sieve plate such as the rhabdion of bulk, marrow, slag, stone falls into outside slag trapping chamber 38 and the discharge machine, is long filament shape coarse fiber bundles clean, the size homogeneous by discharging opening 32 outputs finally.

Described cleaning dust removal machine 4 can be selected drum-type rinsing machine, waterpower material washing machine for use, preferably selects multi roll sandstone metal collectors for use.

Described squeeze crack machine, can be screw extrusion shredder, double helix fiberizer, kneading or grinding leaser, twin-screw roller type paste mill, what select for use in this implementation system is the squeeze crack impregnator, extremely shown in Figure 10 as Fig. 5, agent structure comprises casing, casing fixedly is made of upper and lower two

halves casing

84,85 make-ups, and rotational support is provided with two-parallel axis roller 80a, 80b in the casing, and charging aperture 86 and discharging opening 87 are separately positioned on the upper and lower side direction in beaming roller two ends.Beaming roller is axially gone up by different order or quantity permutation and combination work section one or work section two or work section three.Work section one is made of feed auger section and the section of rolling A2, the section of rolling A1 is that axial multiple tracks rolls dish 81 stacked compositions, roll dish 81 for having the cam that rolls arc outline, multiple tracks rolls dish and is crisscross arranged diametrically successively and constitutes the section of rolling, and to the discharging direction, the radially stagger angle that multiple tracks rolls dish is by dwindling setting greatly gradually from charging; Work section two is made of feed auger section B1 and grinding tooth dish section B2, grinding tooth dish 82 is the multi-groove type sheave, and respectively encircling of grinding tooth dish 82 evenly offers some skewed slots 83 on the tooth, and the height of skewed slot 83 is identical with the tooth depth of grinding tooth dish 82, its notch is rectangular, and is 15～25 ° angle with the beaming roller axis; Work section three is made of feed auger section C 1 and reverse acting spiral section C2, evenly be provided with some skewed slots 89 on the reverse thread tooth 88 of reverse acting spiral section, the height of skewed slot 89 is identical with the tooth depth of reverse thread tooth 88, and its notch is rectangular, and is 30～45 ° of angles with axis.Raw material is sent into this squeeze crack impregnator by decatize conveying worm 6, the physics extruding is implemented in the two rollers engagement, raw material is torn into thread, the heat of Shi Fanging raises built-in temperature significantly and produces boil-off gas simultaneously, the raw material cell wall extruding is split, the moisture content of fibrous inside, air and non-fibre composition, as lignin, pectin, tannin, heteroproteose cell, ash, materials such as resin are come out by a certain amount of extruding, sift out by screen cloth in the machine and to drain, raw material extremely is squeezed into the velvet shape, in the adding medicine mouth or steam inlet 84a adding machine of dipping medicament by each work segment ends, material is impregnated into fibrous inside rapidly as the sponge of extremely compression in cell membrane with soup, makes fibrous raw material obtain the rapid osmotic action-reaction.

Described stirring impregnation bin can be hydrabrusher, waterpower grass washing machine, preferably selects for use waterpower to stir impregnator.

Described high-concentration boiling and bleaching slurrying all-in-one, it is the horizontal pulping tank of sealing with closed sandwich A, and having with the horizontal central line is the rotary drive mechanism of axis, and the pulping tank both sides are rotated through bearing 150 and are provided with, its central authorities are set with gear wheel 30, drive through worm and gear and rotate.The pulping tank upper center is provided with feed pipe 100, the pulping tank inside of feed pipe 100 is arranged with the threeway 170 of the mouth of pipe towards two side direction, slurry pours in pulping tank by threeway 170 to both sides, distribution in pulping tank is comparatively even, the pulping tank below is provided with a plurality of leakage fluid drams 80, be laid on the pulping tank below and be provided with sieve plate B, discharged pulping tank by leakage fluid dram 80 by the liquid matter of filtering; Pulping tank one side bottom is provided with the laterally disposed discharge nozzle of the mouth of pipe 90, after slurrying finishes, has accumulated suitable oxygen enrichment air pressure in jar, and this air pressure is initiatively arranged form slurry and outwards spurted, and has reached the technical purpose of smooth and easy blowdown.Run through axially to support being provided with drug liquid tube 101 in the pulping tank, be evenly equipped with aperture on the drug liquid tube 101 by stay pipe 120.Be set with material toggling sheet 110 on the pulping tank tank skin, in the pulping tank rotation, strengthen even stirring and mixing effect.Pulping tank one end axial location is provided with the multichannel rotary valve, as shown in Figure 3 and Figure 4, the multichannel rotary valve includes valve body 41 and rotary spool 42 formations that rotatory sealing cooperates, spool 42 is fixed on the pulping tank, the soup cavity 43 that is connected by spool central authorities is communicated with pulping tank inner liquid medicine pipe 101, the parallel thermal source that also is provided with medicine liquid channel is introduced cavity 44 and is drawn cavity 45 and compressed air introducing cavity and draw cavity in the spool 42, low-temperature receiver is introduced cavity and is drawn cavity, valve body 41 is provided with thermal source introducing annular groove 144 and draws annular groove 145 and compressed air introducing annular groove 140 and draw annular groove 141 with the valve wall that spool 42 is rotatably assorted, low-temperature receiver is introduced annular groove and is drawn annular groove, corresponding with the corresponding annular groove respectively connection of each cavity, valve body 41 is provided with the external pipeline that communicates with each annular groove, and thermal source or low-temperature receiver external pipeline 46 are introduced cavity 44 or low-temperature receiver introducing cavity through thermal source successively, input pipe 50, pulping tank interlayer A, return pipe 60, thermal source is drawn cavity 45 or low-temperature receiver is drawn cavity, external pipeline 47 constitutes boiling heating or cooling channel.

High-concentration boiling and bleaching slurrying all-in-one discharge gate is communicated to pulp bin 12, the pulp bin pump line connects thickening machine 14, described thickening machine is thickening equipment such as single Double screw pulp extruder, belt filter press, Var-nip press, pressafiner, implement the operation of squeezing delignified pulp middle-stage wastewater, its discharging concentration is controlled at 25-30%, its waste water recovery rate 〉=90%.Be delivered to high middle-density refiner by conveying equipment, dilution, low dense fiberizer, screening, slurry squeezing thickener output concentration are the commercial pulp of 25-30%.

The disclosed high yield environmental protection paper-making pulping process method of the present patent application, include pretreatment of raw material section, physics silk impregnation process section, soak to steam and float three sections one slurrying sections and thickening processing section, below the percentage formed of each medicament be the percentage amounts that accounts for plant material weight;

1., pretreatment of raw material section: plant material is through cutting off and the hammering silkization, remove the preimpregnation soup that silt particle and slag thing add softening swollen raw material simultaneously, be 60-80 ℃ in temperature and flooded 5-10 minute down, cleaning residual silt particle, chip in the raw material, thereafter dehydration, softening raw material 5-10 minute of decatize; Described preimpregnation soup includes neopelex 0.02～0.08%, NaOH 0.3～0.8%, chelating agent 0.25～0.6%, bleeding agent fatty alcohol-polyoxyethylene ether JFC 0.025～0.1%; Described chelating agent is one of any among EDTA or the DTPA;

2., physics silk impregnation process section: will handle a raw material through 1. section and send into the squeeze crack machine, implementing powerful the squeezing of physics grinds, tears, crumples and be the staple shape, add the dipping medicament in squeeze crack machine work segment ends, in steeper, stir dipping, make medicament fully impregnated in fibrous inside; Described dipping medicament includes neopelex 0.02～0.15%, NaOH 2～3.5%, chelating agent 0.15～0.35%, and described chelating agent is one of any among EDTA or the DTPA;

3., soak to steam and float three sections one slurrying sections: 2. section dipping raw material is sent into high-concentration boiling and bleaching slurrying all-in-one, and filter screen filters the 2. liquid matter composition of section raw material, implements slaking successively in same mash vessel, steams and float reaction and bleaching action; The slaking period: run through drug liquid tube by central authorities in the all-in-one and add the slaking medicament, under the pressure condition of 80-100 ℃ of temperature and 0.1-0.3MPa slaking 60-90 minute; It is that oxygen floats delignification's reaction period that the reaction period is floated in steaming: added to steam by drug liquid tube and float medicament, again by the drug liquid tube aerating oxygen, steam under the pressure condition of 80-100 ℃ of temperature and 0.3-0.5MPa and float reaction 30-90 minute; The bleaching action period, need to divide two-four periods to add oxygen successively and float medicament by drug liquid tube, keep the 0.3-0.5MPa oxygen pressure, under 70-90 ℃ of temperature conditions bleaching action 30-60 minute, at last by the oxygen enrichment gas pressure discharging slurry of putting aside in the all-in-one space; Described slaking medicament includes NaOH 1.5～3%, magnesium sulfate 0.1～0.5%, sodium metasilicate 1～3.5%, sodium sulfite 0.5～1.5%, oxygen and floats agent 0.5～1.5%; Described steaming is floated medicament and is comprised that chelating agent 0.25～0.6%, NaOH 1～3%, magnesium sulfate 0.2～1%, sodium metasilicate 1.5～3.5%, oxygen float agent 2～4%; Described oxygen floats medicament and comprises that magnesium sulfate 0.1～0.5%, sodium metasilicate 2～6%, oxygen float agent 3～5%; It is at least a in SODIUM PERCARBONATE, sodium peroxide, hydrogen peroxide, carbamide peroxide, the peracetic acid that oxygen wherein floats agent;

4., thickening processing section:,, get commercial pulp again through defibrination, screening, purification by dehydration concentrator press dewatering.

Below with reference to specific embodiment, the aforementioned techniques scheme is given to launch and describe in detail, but the technical scheme of patent application of the present invention is not limited to by following embodiment.

Embodiment 1

Raw material: paddy and wheat grass

Raw material enters in the branch bolting silk blanking dirt all-in-one by rotor formula chaffcutter chaffcutter, the waste residue bits that filter out are delivered to the waste residue biomass gasification system, shown in the frame of broken lines structure of Fig. 1, the raw material that broken silk is handled is sent into multi roll sandstone metal gathering machine, add the preimpregnation medicament, the preimpregnation medicament includes neopelex 0.05%, bleeding agent fatty alcohol-polyoxyethylene ether JFC0.05%, NaOH 0.5%, DTPA0.5%, liquor ratio 1: 20, effect by multiple roll material toggling sheet and current, raw material is through pre-wash, washing, dipping temperature is 75 ℃, quicken infiltration, the swollen raw fiber, with bulk sandstone or the great foreign bodies removal of carrying secretly in the raw material of metal sundries geometric ratio, fall into outside the bottom collection slag ladle timing discharge machine, washing material is flow in the inclined screw Water Extraction Machinery certainly by the effect of current, raw material is upwards carried by the gravity effect by the bottom, the free water that is mingled with in the raw material is discharged from the spiral sieve aperture, raw material dewaters after the decatize screw machine is sent in the squeeze crack impregnator, 100 ℃ of steam temperatures, through the extruding and tearing of squeeze crack impregnator and the impregnation process of dipping soup, raw material changes crude fibre into, described dipping medicament comprises neopelex 0.05%, NaOH 3%, DTPA0.2%, press transportation concentration 6% and calculate its liquor ratio, be delivered in the high-concentration boiling and bleaching slurrying all-in-one through pre-dipping machine of waterpower and raw material pump line, by the dipping soup of the pre-dipping machine of waterpower as delivery vehicles, 70 ℃ of temperature, transportation concentration 6%, the dipping soup leaches in the pre-dipping machine of gravity flow backwater power and recycles when high-concentration boiling and bleaching slurrying all-in-one is reinforced, thereafter add the slaking medicament, temperature is 100 ℃, pressure is 0.2MPa, reaction time is 60 minutes; Add steaming by drug liquid tube and float medicament and oxygen, keep oxygen to press to 0.35MPa, reaction temperature are 80 ℃, the reaction time is 60min, and then divides two-four sections to add oxygen successively by drug liquid tube and float medicament, temperature is 80 ℃, reaction time is 60min, and bleaching finishes the back and slurry sprayed into to pulp bin above-mentioned slaking pharmacy kit sulfur acid magnesium 0.5% by discharge gate, sodium sulfite 1.5%, NaOH 3%, SODIUM PERCARBONATE 1.5%, sodium metasilicate 2.5%; Steaming is floated medicament and is comprised NaOH 2.5%, magnesium sulfate 0.5%, sodium metasilicate 3%, hydrogen peroxide 4%; Oxygen floats pharmacy kit and contains sodium metasilicate 4%, magnesium sulfate 0.5%, hydrogen peroxide 4%, carbamide peroxide 1%.

Spurting two senior middle school's concentration fiberizers that the slurry that sends into series connection by conveying worm after by the acroll press washer press dewatering pulls an oar successively, beating consistency 25%, mill disposed slurry gravity flow falling into the pond 10 of diving of disappearing and disappearing to dive and handle, delivering to pressurized screen by stock pump again screens, good slurry is admitted to belt filter press, pass through filter-press dehydration, obtain the wet shape market pulp of concentration 25-30%, also can send into the online of sizing mixing of paper machine system and copy paper, the slag slurry in the pressure screening process is sent into defibrination system reslurry again.

Spurt the slurry that after floating and float the back waste residue by what acroll press washer was deviate from, wherein a part is back to the wet method preimpregnation behind simple and easy sedimentation and filtration, be used as and wash pre-immersion of material and pulp bin circulation dilution water, the water that removes of remaining most middle-stage wastewater and dehydration conveying equipment 5 is sent into wastewater treatment jointly and is utilized in the system again, through coarse rack filtration, flotation tank precipitation, flocculation, air supporting, through screen, preliminary sedimentation tank, the pre-acidification pool of adjusting, IC anaerobic reactor, aerobic aeration tank and second pond, the processing water of output is back in the pulping system.

At chaffcutter, divide the broken thin waste material slag bits that sift out in the bolting silk blanking dirt process, foreign material, squeeze crack impregnator that the wet method preimpregnation is discharged to discharge organic substance and wastewater treatment to utilize waste residues such as sediment in the systematic procedure, high concentration press filtration mud again, abundant mixing by double roller mixer, send into biomass fuel feed bin, biomass gasifying furnace system successively, producing biological fuel gas is stored in the gas tank, produce electric energy by the gas electricity generator system and be back in the system equipment and use, the heat release of can also burning is used.

Embodiment 2

Raw material: reed

Raw material is by the disk chipper blank, enter in multi-functional minute bolting silk blanking dirt all-in-one, the waste material slag that filters out is considered to be worth doing to the waste residue biomass gasification system, the raw material that broken silk is handled is sent in the multi roll sandstone metal gathering machine, add the preimpregnation medicament, the preimpregnation medicament comprises neopelex 0.05 %, bleeding agent fatty alcohol-polyoxyethylene ether JFC0.05%, NaOH 0.5%, DTPA0.5%, liquor ratio 1: 20, effect by multiple roll material toggling sheet and current, raw material is through pre-wash, washing, dipping temperature is 75 ℃, quicken infiltration, the swollen raw fiber, with bulk sandstone or the great foreign bodies removal of carrying secretly in the raw material of metal sundries geometric ratio, fall into outside the bottom collection slag ladle timing discharge machine, washing material is flow in the inclined screw Water Extraction Machinery certainly by the effect of current, raw material is upwards carried by the gravity effect by the bottom, the free water that is mingled with in the raw material is discharged from the spiral sieve aperture, raw material dehydration back is sent in the squeeze crack impregnator by the decatize spiral, 100 ℃ of steam temperatures, through the extruding and tearing of squeeze crack impregnator and the impregnation process of dipping soup, raw material changes crude fibre into, the dipping medicament comprises neopelex 0.05%, NaOH 3%, DTPA0.2%, press transportation concentration 6% and calculate its liquor ratio, be delivered to high-concentration boiling and bleaching slurrying all-in-one through pre-dipping machine of waterpower and feedstock pump, the pre-dipping machine of waterpower uses the dipping soup as delivery vehicles, temperature is 70 ℃, when high-concentration boiling and bleaching slurrying all-in-one is reinforced, leach in the pre-dipping machine of dipping soup gravity flow backwater power and recycle, add the slaking medicament thereafter, temperature is 100 ℃, pressure 0.3MPa, 60 minutes reaction time, by drug liquid tube add steam and float medicament and oxygen thereafter, keep oxygen to press and be 0.5MPa, reaction temperature is 80 ℃, reaction time is 60 minutes, divide two-four sections to add oxygen successively by drug liquid tube and float medicament again, reaction temperature is 90 ℃, reaction time is 60 minutes, bleaching finishes the back and by discharge gate slurry is sprayed into to pulp bin, wherein slaking pharmacy kit sulfur acid magnesium 0.5%, sodium sulfite 1.5%, NaOH 3%, SODIUM PERCARBONATE 2%, sodium metasilicate 2.5%; Steaming is floated pharmacy kit and is contained NaOH 3%, magnesium sulfate 0.5%, sodium metasilicate 3%, hydrogen peroxide 4%; Oxygen floats pharmacy kit and contains sodium metasilicate 5%, magnesium sulfate 0.5%, hydrogen peroxide 4%, carbamide peroxide 1%.

Spurting two senior middle school's concentration fiberizers that the slurry that sends into series connection by conveying worm after by the acroll press washer press dewatering pulls an oar successively, high consistency beating disposed slurry gravity flow falling into the pond of diving of disappearing and disappearing to dive and handle, be pumped to 1 DFSP awl flat double disc refiner correct grinding again, refining concentration 3.5%, sending into pressurized screen again screens, good slurry is admitted to belt filter press, by filter-press dehydration, obtains the wet shape market pulp of concentration 25-30%.Slag in pressure screening process slurry is refluxed again to be sent into the DFSP fiberizer and finish grindes making beating again.

The slurry that floats back ejection floats the back waste residue by what acroll press washer was deviate from, wherein a part is back to the wet method preimpregnation behind simple and easy sedimentation and filtration, be used as and wash pre-immersion of material and pulp bin circulation dilution water, the water that removes of remaining most middle-stage wastewater and dehydration conveying equipment 5 is sent into wastewater treatment jointly and is utilized in the system again, through coarse rack filtration, flotation tank precipitation, flocculation, air supporting, through screen, preliminary sedimentation tank, the pre-acidification pool of adjusting, IC anaerobic reactor, aerobic aeration tank and second pond, the processing water of output is back in the pulping system.

Embodiment 3

Raw material: Chinese holly trees sheet

Raw material enters chip screen by chipping machine, accepted chips is sent in the multi roll sandstone metal gathering machine by belt conveyor, add the preimpregnation medicament, the preimpregnation medicament comprises neopelex 0.05%, bleeding agent fatty alcohol-polyoxyethylene ether JFC0.05%, NaOH 0.5%, DTPA0.5%, liquor ratio 1: 20, washing, dipping temperature is 80 ℃, quicken infiltration, the swollen raw fiber, effect by multiple roll material toggling sheet and current, raw material is through pre-wash, with bulk sandstone or the great foreign bodies removal of carrying secretly in the raw material of metal sundries geometric ratio, fall into outside the bottom collection slag ladle timing discharge machine, washing material flow in the inclined screw Water Extraction Machinery under the effect of current certainly, raw material is upwards carried by the gravity effect by the bottom, the free water that is mingled with in the raw material is discharged from the spiral sieve aperture, raw material dehydration back is sent in the squeeze crack impregnator by the decatize spiral, 100 ℃ of steam temperatures, send into the extruding and tearing effect of squeeze crack impregnator and the impregnation process of dipping soup, raw material changes crude fibre into, its dipping medicament comprises neopelex 0.05%, NaOH 3%, DTPA0.2%, deliver in the high-concentration boiling and bleaching slurrying all-in-one through waterpower preimpregnation pump, the pre-dipping machine of waterpower uses the dipping soup as delivery vehicles, transportation concentration 6%, 70 ℃ of temperature, recycle in the pre-dipping machine of dipping soup gravity flow backwater power that when high-concentration boiling and bleaching slurrying all-in-one is reinforced, leaches, add the slaking medicament thereafter, temperature is 100 ℃, pressure 0.3MPa, reaction time 70min, add to steam by drug liquid tube again and float medicament and oxygen, keep oxygen to press and be 0.5MPa, reaction temperature is 90 ℃, reaction time is 80 minutes, two-four sections add oxygen successively by drug liquid tube and float medicament again, reaction temperature is 90 ℃, reaction time is 80 minutes, bleaching finishes the back and by discharge gate slurry is sprayed into to pulp bin, wherein slaking pharmacy kit sulfur acid magnesium 0.5%, sodium sulfite 1.5%, NaOH 3%, SODIUM PERCARBONATE 2%, sodium metasilicate 2.5%; Steaming is floated pharmacy kit and is contained NaOH 3%, magnesium sulfate 0.5%, sodium metasilicate 3%, hydrogen peroxide 4%; Oxygen floats pharmacy kit and contains sodium metasilicate 5%, magnesium sulfate 0.5%, hydrogen peroxide 3.5%, carbamide peroxide 1.5%.

Spurting the slurry that sends into two senior middle school's concentration fiberizers of series connection by conveying worm after by the acroll press washer press dewatering and pulls an oar successively, high consistency beating disposed slurry gravity flow falling into the pond of diving of disappearing and disappearing to dive and handle, deliver to 2 DFSP awl flat double disc refiner correct grindings by stock pump again, refining concentration 3.5%, entering pressurized screen again screens, good slurry is admitted to belt filter press, by filter-press dehydration, obtains the wet shape market pulp of concentration 25-30%.Slag in pressure screening process slurry is refluxed again to be sent into the DFSP fiberizer and finish grindes making beating again.

Spurt the slurry that after floating and float the back waste residue by what acroll press washer was deviate from, wherein a part is back to the wet method preimpregnation behind simple and easy sedimentation and filtration, be used as and wash material and soak in advance and spurt pulp bin circulation dilution water, remaining most middle-stage wastewater and dehydration conveying equipment 5 remove water and send into wastewater treatment jointly and utilize in the system again, through coarse rack filtration, flotation tank precipitation, flocculation, air supporting, through screen, preliminary sedimentation tank, the pre-acidification pool of adjusting, IC anaerobic reactor, aerobic aeration tank and second pond, the processing water of output is back in the pulping system.

Claims

1. one kind high yield environmental protection paper-making pulping process method is characterized in that this method comprises pretreatment of raw material section, physics silk impregnation process section, soaks to steam and float three sections one slurrying sections and thickening processing section; The percentage that medicament is wherein formed is the percentage amounts that accounts for plant material weight;

2. high yield environmental protection paper-making pulping system that realizes claim 1 paper-making pulping process method, it is characterized in that system includes stock-cutter successively by the technology circuit, the hammer bolting silk selects dust removal machine, clean dust removal machine, the dehydration conveying equipment, the decatize conveying worm, the squeeze crack machine, stir impregnation bin, pump line is connected to high-concentration boiling and bleaching slurrying all-in-one, drainage conduit is connected to pulp bin again, the pulp bin pump line connects the thickening machine, the thickening machine exports high-density paste mill to, high-density paste mill output connects screening clearing machine and concentration squeezing machine successively, the preimpregnation drug liquid tube feeds and cleans dust removal machine and decatize screw machine, dipping medicament pipe feeds squeeze crack machine, slaking medicament, steaming is floated medicament and oxygen and is floated the medicament pipe and feed high-concentration boiling and bleaching slurrying all-in-one at times.

3. high yield environmental protection paper-making pulping according to claim 2 system, it is characterized in that hammering into shape bolting silk, to select dust removal machine be multi-functional minute bolting silk blanking dirt all-in-one, its structure is: the some roads beaming roller that is had by parallel horizontal rotational support in the tunnel passage of charging aperture to the casing of discharging opening, evenly be set with the pin thorn of some quantity on the beaming roller surface, be articulated in interspersed being distributed in the middle of the pin thorn of hammer cutter of beaming roller, the beaming roller top is provided with sieve plate, the below is provided with down sieve plate, following sieve plate has the cambered surface of stinging and hammer into shape the setting of cutter maximal margin circular trace spacing with the beaming roller pin, and cambered surface is provided with some roads and is the bed plate that shearing cooperates with pin thorn and hammer cutter.

4. high yield environmental protection paper-making pulping according to claim 2 system, it is characterized in that squeeze crack extruding strings device wherein is the squeeze crack impregnator of twin shaft roller work structuring, rotational support is provided with two parallel engagement beaming rollers in the casing of squeeze crack impregnator, charging aperture and discharging opening are separately positioned on the beaming roller two ends, select at least work section one, work section two and work one of in the section three and the quantity of selected work section be at least one group vertically assembled arrangement be arranged on each beaming roller; Described work section one is made of jointly the feed auger section and the section of rolling, the section of rolling is that axial multiple tracks rolls the dish composition, roll dish for having the cam that rolls arc outline, multiple tracks rolls disc radial and is crisscross arranged and constitutes the section of rolling, the spiral section clearance meshing of two rollers cooperates, and rolling of each respective shaft position of the section of rolling coiled staggered the cooperation; Described work section two is made of jointly feed auger section and grinding tooth dish section, and the grinding tooth dish is the multi-groove type sheave, and respectively encircling of grinding tooth dish evenly offers some skewed slots on the tooth, two rollers spiral section and the intersegmental crack of grinding tooth dish engagement fit; Described work section three is made of jointly feed auger section and reverse acting spiral section, evenly be provided with some skewed slots on the reverse thread tooth of reverse acting spiral section with respect to axioversion, the intersegmental crack of two rollers spiral section and reverse acting spiral engagement fit, medicament mouth or steam inlet are arranged at the segment ends of respectively working.

5. high yield environmental protection paper-making pulping according to claim 2 system, it is characterized in that high-concentration boiling and bleaching slurrying all-in-one wherein is the horizontal pulping tank of sealing with closed sandwich, have with the horizontal central line is the rotary drive mechanism of axis, the pulping tank upper center is provided with feeding-passage, the pulping tank inside of feeding-passage is arranged with the threeway of the mouth of pipe towards both sides, the pulping tank below is provided with leakage fluid dram, is laid on the pulping tank below and is provided with sieve plate; Pulping tank one end is provided with the laterally disposed discharge nozzle of the mouth of pipe; Pulping tank one end axis place is provided with the multichannel rotary valve, the multichannel rotary valve includes valve body and the rotary spool formation that rotatory sealing cooperates, spool is fixed on the pulping tank, the soup cavity connects spool central authorities, and be communicated with drug liquid tube in pulping tank, be evenly equipped with aperture on the drug liquid tube, being provided with the thermal source parallel with medicine liquid channel in the spool introduces cavity and draws cavity, the valve wall that valve body cooperates with valve core rotation is provided with thermal source and introduces annular groove and draw annular groove, corresponding with the corresponding annular groove respectively connection of each cavity, valve body is provided with the external pipeline that communicates with each annular groove, and the thermal source of external pipeline is gone into pipe and introduced cavity through thermal source successively, input pipe, the pulping tank interlayer, return pipe, thermal source is drawn cavity, external pipeline constitutes boiling and adds heat passage.