CN102000681B - Thermal decomposition adhesive material removing method and thermal decomposition gasification system - Google Patents
Thermal decomposition adhesive material removing method and thermal decomposition gasification system Download PDFInfo
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- CN102000681B CN102000681B CN201010249036.5A CN201010249036A CN102000681B CN 102000681 B CN102000681 B CN 102000681B CN 201010249036 A CN201010249036 A CN 201010249036A CN 102000681 B CN102000681 B CN 102000681B
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 55
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Abstract
The invention provides a method capable of effectively removing thermal decomposition products on an inner wall of a pipe in a biomass thermal decomposition gasification system and a thermal decomposition gasification system. The thermal decomposition adhesive removing method is that: in the thermal decomposition gasification system (10) of the biomass such as an underwater sludge and a woody biomass, the mixed gas of below 13 volume% of an inactive gas and above 5 volume% of oxygen is arranged in the pipe (12) between a thermal decomposition gasification furnace (11) and a combustion furnace (13) to circulate and the thermal decomposition adhesive material on the inner wall of the pipe at the gas temperature of above 500DEG C burns to be removed.
Description
Technical field
The present invention relates to remove the method that is attached to the thermal decomposition product on pipe arrangement inside etc. in the thermal decomposition gasification system of the living beings of downflow sludge, Wooden Biomass etc.
Background technology
In the illustrative biomass thermal decomposition gasification of Fig. 1 system 10, in thermal decomposition gasification furnace 11, under the atmosphere of 300～600 ℃ of temperature, blocking-up oxygen, biomass thermal is decomposed.Thermal decomposition gas in the 11 interior generations of thermal decomposition gasification furnace is transported to combustion furnace 13 via pipe arrangement 12, in combustion furnace 13 internal combustion.
While making the running of above-mentioned biomass thermal decomposition gasification system, at pipe arrangement inwall and be arranged on the impeller etc. of pipe arrangement air blast 14 midway heat of condensation decomposition gas and adhere to or pile up dust part.After the amount of attachment and deposit (hereinafter referred to as attachment) increases, because of pipe arrangement obturation and impeller balance deterioration, so produce, the output of air blast increases and vibration increase waits continuous operation fault.Therefore, need to make termly thermal decomposition gasification system stop, attachment is also removed in cleaning pipe arrangement inside.
In oil-refinery industry and petro chemical industry etc., be known to a kind of thermal decomposition attachment removal method that is called decoking.Decoking is a kind of method as described below: the steam of high temperature and inactive gas are circulated in pipe arrangement, and the attachment thermal shock of giving pipe arrangement inwall, make thus attachment produce spallation (shrinking fracture) and come off from pipe arrangement, the attachment having come off is discharged by fluid (gas), and utilize the gas of sneaking into a small amount of air make residual attachment burning and decompose.
In patent documentation 1, record in more than 600 ℃ combustion decomposition because avoiding the deteriorated of tubing matter, and need strict running management.When recording in addition attachment amount and implementing spallation when many, the coke of peeling off stops up the problem of pipe.In order to prevent the generation of these situations, in patent documentation 1 disclosed technology be coke that the former wet goods because being attached in pipe is produced under the mixed atmosphere of air and steam or inactive gas, under the condition of 350 ℃～500 ℃ of temperature, oxygen concentration 3 volume %～21 volume %, implement decoking.
Patent documentation 1: No. 2973347 communique of Japanese Patent (right item 1, paragraph [0013]～[0018], [0020])
In biomass thermal decomposition gasification system, although think that the spallation that gas causes has effect to a certain degree to decompose the removal of attachment at the formed more soft biomass thermal of skin section, need to maintain highlyer by the velocity in pipes of gas and pressure.This viewpoint reducing from most important life cycle cost in the biomass energy conversion equipment of biomass thermal decomposition gasification system etc. is unsatisfactory.In addition, in biomass material, to compare attachment more with petroleum, therefore, while at high temperature making biomass thermal decompose attachment combustion decomposition, easily produces local heating and burning out of control.
In addition, deriving from the thermal decomposition attachment (coke) of oil and deriving from the thermal decomposition attachment of living beings, because of composition completely different, so the proterties of attachment and thermal decomposition mechanism are different.In patent documentation 1, in order to prevent from resulting from that the thermal denaturation sclerosis of coke shrinks, peeling off, 500 ℃ of following combustion decomposition of implementing.But, under the condition of patent documentation 1, even if carry out the removal of the thermal decomposition attachment of biomass thermal decomposition gasification system, due to attachment poor removal effect, therefore also can produce the problem that needs long-time this class while removing.That is,, under the condition of patent documentation 1, removing biomass thermal decomposition attachment needs long-time arrestment, poor practicability.
Summary of the invention
The invention provides a kind ofly in the thermal decomposition gasification system of living beings, can effectively remove the method and the thermal decomposition gasification system that are attached to the thermal decomposition product on pipe arrangement inwall etc.
In order to address the above problem, the invention provides a kind of thermal decomposition attachment removal method, in the thermal decomposition gasification system of the living beings such as downflow sludge, Wooden Biomass, making oxygen concentration is that 5 volume % the mist above and inactive gas below 13 volume % and oxygen circulates to the pipe arrangement being arranged between thermal decomposition gasification furnace and combustion furnace, at gas temperature, be under more than 500 ℃ conditions, make to be attached to the thermal decomposition attachment burning on the inwall of described pipe arrangement and remove.
In addition, this aspect provides a kind of thermal decomposition gasification system, is the thermal decomposition gasification system of the living beings such as downflow sludge, Wooden Biomass, wherein, possesses: thermal decomposition gasification furnace; Be arranged on the combustion furnace in this thermal decomposition gasification furnace downstream; Be arranged on the pipe arrangement between described thermal decomposition gasification furnace and described combustion furnace, also possess: oxidant supply port, is connected with described pipe arrangement, for supplying with the oxidant as the mist of inactive gas and oxygen to described pipe arrangement; Oxidant adjustment part, for being adjusted into the oxygen concentration of described oxidant below the above 13 volume % of 5 volume %; For the heating part that the inwall of described pipe arrangement is heated; The temperature of the gas of the inner side circulation at described pipe arrangement is carried out to the gas temperature test section of instrumentation; And for controlling the gas temperature control part of described gas temperature.
For being attached to the pipe arrangement of biomass thermal decomposition gasification system and being arranged on the attachment on pipe arrangement air blast midway, at 300～600 ℃ of vaporized compositions, are main bodys.When thermal decomposition gas arrives pipe arrangement and air blast, lower with respect to the temperature of gas temperature pipe arrangement inwall while starting due to equipment, so gas componant is condensed and is attached on pipe arrangement inwall.During the accumulation horizon thickening of thermal decomposition attachment, accumulation horizon becomes thermal insulation layer, so along with the growth of attachment, higher boiling composition is mainly stacked.That is, the face side of accumulation horizon is mainly higher boiling composition.In the present invention, by forming gas temperature, be 500 ℃ of above conditions, combustion decomposition is removed the higher boiling composition of accumulation horizon face side effectively, so promote the decomposition reaction to accumulation horizon lower floor.At biomass thermal, decompose in the situation of attachment, the thermal denaturation sclerosis not being created within the scope of said temperature is shunk, and does not have attachment to peel off in a large number the also danger of inaccessible pipe arrangement.
While implementing combustion decomposition under the inactive gas more than oxygen concentration is 5 volume % and below 13 volume % and the mixed-gas atmosphere of oxygen, by partial combustion, thermal decomposition attachment is oxidized, promotes the phase change from solid to gas.In addition, in the present invention, can use the inexpensive devices as membrane separation device to adjust within the scope of above-mentioned oxygen concentration, can reduce life cycle cost.When oxygen concentration is also low than 5 volume %, reactivity reduces sharp.On the other hand, when oxygen concentration surpasses 13 volume %, cause burning out of control, the difficulty that becomes is controlled in reaction.
In thermal decomposition attachment removal method of the present invention, can be combustion decomposition under the low flow velocity in 1m/s left and right at the superficial linear velocity in a column of pipe arrangement, therefore suppress the quantity delivered of mist.Therefore, can reduce life cycle cost.
In thermal decomposition gasification system of the present invention, described oxidant adjustment part possesses the mixing portion of mixing for being collected in the pipeline of the waste gas circulating in described pipe arrangement and the waste gas that this is collected and air, therefore can be reduced in the power needing in oxidant manufacture, so preferably.
In foregoing invention, at described gas temperature, be preferably under the condition below 650 ℃, to remove described decomposition attachment.In addition, in the iron sheet temperature of described pipe arrangement, be preferably under the condition below 600 ℃, to remove described thermal decomposition attachment.
As long as meet the mode of said temperature scope with the iron sheet temperature (temperature of pipe arrangement outer surface) of gas temperature or pipe arrangement, make thermal decomposition attachment combustion decomposition, can prevent the damage of pipe arrangement and deteriorated.
In foregoing invention, preferably to the described mist of supplying with normal temperature in described pipe arrangement.
In the present invention, there is no need in advance the mist of supply to be heated to above-mentioned reaction temperature.Reaction heat when the mist utilization of supplying with is burnt heats up.Therefore, can suppression equipment the use amount of fossil fuel during running, and there is no need mist and supply with the oxymeter of system and be set to high temperature resistant mode and resistance to waste gas mode.Its result, can reduce life cycle cost.
In foregoing invention, preferably to being arranged in the pipe arrangement of described pipe arrangement upstream side midway, supply with described mist.
While supplying with the mist as oxidant from pipe arrangement upstream portion, be deposited in attachment on the impeller etc. of pipe arrangement inwall and air blast from upstream side successively combustion decomposition.Gas temperature and the pipe arrangement temperature of measuring pipe arrangement downstream, if temperature is below setting, the combustion decomposition that can judge pipe arrangement inside finishes.That is,, according to the present invention, even if oxymeter is not set in pipe arrangement inside, also can hold combustion decomposition situation according to gas temperature and reaction temperature.
In foregoing invention, preferably, gas temperature in pipe arrangement described in a place of described pipe arrangement or many places instrumentation, this instrumentation to gas temperature at least one value while surpassing 650 ℃, make the oxygen concentration of the described mist that circulates in described pipe arrangement be reduced to less than 5 volume %.
As mentioned above, when reaction temperature uprises, the possibility that the material of pipe arrangement sustains damage improves.Therefore, when the gas temperature in the pipe arrangement of a place or many places instrumentation surpasses 650 ℃, if make the oxygen concentration less than 5 volume % of mist, suppress combustion decomposition reaction, reduce gas temperature, utilize gas to make pipe arrangement cooling.According to the present invention, easily control combustion decomposition reaction, and can prevent the damage of pipe arrangement.
In foregoing invention, preferably to the inwall of the sloping portion of described pipe arrangement, spray the compressed air of normal temperature.In addition, preferred thermal decomposition gasification system of the present invention also possesses for the inwall to described pipe arrangement and sprays compressed-air actuated nozzle.
For example, the contracted flow portion of pipe arrangement and relatively vertical direction tilt or the inwall of the rake of the pipe arrangement such as horizontally disposed pipe arrangement on, thermal decomposition gas easily concentrates on a side and adheres to, part is formed with the accumulation horizon of thick thermal decomposition attachment.When accumulation horizon is thicker, decoking required time is elongated.In addition, the downside inwall grading at pipe arrangement rake is piled up the ash content generating because of burning, and therefore, the reactivity of thermal decomposition attachment and oxygen declines.
While spraying normal temperature compressed air to the part that is formed with the accumulation horizon of thick attachment, because spraying the impact producing, at accumulation horizon, crack.In addition, the ash content after burning disperses towards downstream.Thus, the contact-making surface of thermal decomposition attachment and oxygen increases, so reactivity improves.To the compressed-air actuated of pipe arrangement inwall, be injected in effective especially in deposit thermal decomposition gasification system more, that the living beings of take are raw material.In addition, because utilizing in the present invention the compressed air of normal temperature, so with the steam spallation comparison of common importing, can significantly reduce life cycle cost.
In described invention, preferred described thermal decomposition attachment burning and the waste gas that produces mixes with auxiliary fuel in described combustion furnace, and carry out above oxidation processes 700 ℃ of temperature.
In the combustion decomposition of described thermal decomposition attachment, the waste gas that contains CO is discharged from.In being arranged at the combustion furnace of back segment, waste gas is mixed with auxiliary fuel, under more than 700 ℃ temperature conditions, carry out oxidation processes, can be used as thus CO
2emit.
If use thermal decomposition attachment removal method of the present invention, can remove safely at short notice the thermal decomposition attachment that derives from living beings.In addition, can reduce the life cycle cost of thermal decomposition gasification system.
Accompanying drawing explanation
Fig. 1 is the skeleton diagram of biomass thermal decomposition gasification system;
Fig. 2 means the skeleton diagram of a part of the biomass thermal decomposition gasification system of Fig. 1;
Fig. 3 means the curve map of the attachment mass change while making biomass thermal decompose attachment burning;
Fig. 4 means the curve map that the gas temperature of each position in decoking and the timeliness of iron sheet temperature change;
Fig. 5 is the part sectioned view of pipe arrangement rake.
The specific embodiment
Below, describe thermal decomposition attachment removal method of the present invention in detail.
In the biomass thermal decomposition gasification system shown in Fig. 1, when the output of air blast 14 surpasses a reference value or after during making the running of biomass thermal decomposition gasification system certain, stop thermal decomposition gasification furnace.Then the combustion decomposition that, is implemented in the upper thermal decomposition attachments of piling up such as impeller of pipe arrangement inwall and air blast is removed (decoking).
Fig. 2 means the skeleton diagram of pipe arrangement part of the biomass gasification system of Fig. 1.In the thermal decomposition attachment removal method of present embodiment, oxidant is from least one importing of pipe arrangement.For example, from oxidant supply port L (the upstream side pipe arrangement of air blast 14), oxidant supply port M (pipe arrangement of thermal decomposition gasification furnace outlet 15), the oxidant supply port N (connecting portion of the sloping portion of pipe arrangement (pipe arrangement rake) 16 and the pipe arrangement being connected with combustion furnace 13) of Fig. 2, supply with oxidant.While supplying with oxidant from being arranged on the oxidant supply port L of upstream side (thermal decomposition gasification furnace side) of air blast 14 or oxidant supply port M, can effectively remove the attachment on the impeller that is attached to air blast, so preferably.In Fig. 2, be provided with an oxidant supply port L, but also a plurality of oxidant supply port L can be set between thermal decomposition gasification furnace 13 and air blast 14.
In the present embodiment, oxidant is the mist of oxygen and nitrogen.More than oxygen concentration in oxidant is made as 5 volume % and below 13 volume %.Oxygen concentration is than 5 volume % when low, and reactivity sharply declines.On the other hand, when oxygen concentration surpasses 13 volume %, cause burning out of control, the difficulty that becomes is controlled in reaction.
Oxygen concentration in oxidant be take the nitrogen of oxygen concentration less than 5 volume % and adjusts as main low oxygen concentration gas and the mixing ratio between compressed air by changing.Low oxygen concentration gas can be used gas film separator and potential device (PSA) to manufacture.For example, be provided with low oxygen concentration gas storage tank and compressed air cylinder, after low oxygen concentration gas and compressed air are mixed with the ratio of hope, supply with in from oxidant supply port to pipe arrangement.
To the oxidant of supplying with in pipe arrangement, be preferably normal temperature.So-called normal temperature refers to and is provided with the identical temperature of temperature (extraneous gas temperature) in the place of compressed air cylinder and low oxygen concentration gas storage tank, for example, be 25 ℃ of left and right.
Above-mentioned low oxygen concentration gas can be at waste gas pipe arrangement 12 interior circulations, that comprise the CO being produced by combustion decomposition.In this situation, on pipe arrangement 12, link and have pipeline.A part for waste gas is discharged and is collected to pipe arrangement is outside by this pipeline.The other end of the pipeline linking with pipe arrangement 12 and the pipeline link that air circulates.At linking part, be provided with flow control valve, regulate the exhausted air quantity of supplying with to the pipeline of circulation of air.By being made as this structure, collected waste gas and air are mixed within the scope of above-mentioned oxygen concentration.Mixed waste gas and air are supplied with to pipe arrangement 12 from oxidant supply port L, M, N as oxidant.
By being made as this structure, do not need, for generating compressed-air actuated air compressor, can reduce oxidant and manufacture needed power.
The oxidant (mist) of the normal temperature of supplying with from oxidant supply port with the superficial linear velocity in a column of 1m/s left and right in the interior circulation of pipe arrangement 12.By heater heating pipe arrangement 12, thereby thermal decomposition attachment is heated.Thermal decomposition attachment is heated to 400 ℃ when above, catches fire and starts decoking.Thermal decomposition attachment partial combustion and after decomposing, gas temperature rises.The gas temperature when combustion decomposition of present embodiment is reacted is more than 500 ℃.By above implementing decokings at 500 ℃, the higher boiling composition gasification mainly comprising in the face side of attachment accumulation horizon, and the reaction of the oxygen in oxidant and promote combustion decomposition reaction.After higher boiling composition is decomposed and removes, carry out the combustion decomposition reaction to accumulation horizon lower layer side.The waste gas that comprises the CO being produced by combustion decomposition and ash content are carried to pipe arrangement 12 downstreams together with mist.
During pyrolysis excess Temperature, the pipe arrangement of austenite stainless steel system produces damage and deteriorated.In order to prevent the damage of pipe arrangement and deteriorated, in the iron sheet temperature of pipe arrangement, be to implement decoking under the condition below 600 ℃.Or, owing to having dependency relation between gas temperature and iron sheet temperature, so also can set according to gas temperature the higher limit of decoking temperature.Because gas temperature is also higher than iron sheet temperature, so the higher limit of gas temperature is set as higher than the higher limit of iron sheet temperature.In the present embodiment, gas temperature during decoking is made as below 650 ℃.To the inner thermometer that inserts of pipe arrangement, gas temperature is carried out to instrumentation.Consider the accumulating amount of attachment and be suitably set in the insertion position of pipe arrangement section.For example, for the pipe arrangement of Φ 300mm, the gas temperature of the position from pipe arrangement inwall to center 100mm is carried out to instrumentation.
Oxygen concentration in oxidant is higher, and the reactivity of thermal decomposition attachment and oxygen is higher.When decoking starts, within the scope of above-mentioned oxygen concentration, supply with after the oxidant of the hyperoxia concentration of comparing, there is the possibility sharply rising because of the gas temperature that catches fire.Therefore, also the oxygen in the oxidant of supplying with can be set as to low concentration when decoking starts, monitor the iron sheet temperature of gas temperature and pipe arrangement, and periodically make oxygen concentration increase.Like this, control reaction and can prevent the generation that temperature sharply rises.
For example, hyperoxia concentration is maintained to oxygen concentration more than 12% and while carrying out decoking, the reactivity of thermal decomposition attachment and oxygen is good, so often gas temperature surpasses 650 ℃ because of reaction heat.In the present embodiment, also can be in the situation that surpass 650 ℃ by the gas temperature of thermometer instrumentation, blocking-up, as the compressed-air actuated supply of oxidant, makes the oxygen concentration in oxidant reduce to less than 5 volume % thus.As mentioned above, during oxygen concentration less than 5 volume %, the combustion reaction rate that biomass thermal decomposes attachment sharply reduces.Therefore, the generation of inhibitory reaction heat, decomposes attachment by oxidant (mist) heat of cooling, and therefore, the gas temperature of institute's instrumentation and heter temperature reduce.During being reduced, oxygen concentration also can decide according to the reduction amplitude of gas temperature.Or, also can set in advance and control according to the mode of blocking compressed-air actuated supply with the stipulated time.At the many places of pipe arrangement instrumentation gas temperature, in the situation that the gas temperature at least one place surpasses 650 ℃ when oxygen concentration is reduced, the control accuracy of combustion decomposition reaction improves, and can further prevent reliably the damage of pipe arrangement and deteriorated.
Decoking is carried out towards downstream from the upstream side of pipe arrangement.This is that oxygen is difficult to arrive the downstream of reaction generation place because react the oxygen in the position oxygen consumed agent producing in combustion decomposition.At attachment, fully burn and remove and the position of decoking after finishing, do not react thermogenetic effect, normal temperature oxidation agent circulation, so the gas temperature of institute's instrumentation reduces.At this moment, in downstream, continue decoking, so gas temperature maintains high temperature.Therefore, the timeliness by mensurated gas composition temperature changes, and can carry out the judgement that decoking finishes.In addition, by a plurality of positions at pipe arrangement, monitor gas temperature, can hold decoking and carry out situation.As mentioned above, associated because existing between gas temperature and iron sheet temperature, so by monitoring the iron sheet temperature of pipe arrangement, also can hold the situation of carrying out of decoking, can judge that decoking finishes.
Fig. 3 represents as 400 ℃ of atmosphere temperatures, 600 ℃ and 800 ℃ of these three conditions, supplies with the oxidant of 400 ℃ of oxygen concentrations 11%, temperature, the attachment mass change while making biomass thermal decompose attachment burning.In the figure, transverse axis is the reaction time, and the longitudinal axis is the ratio with respect to the residual attachment quality of initial attachment quality (20g).
Compare with 400 ℃ of temperature, because of larger in 600 ℃ of temperature and 800 ℃ of quality reductions, therefore can say reactive raising.The reactivity of 600 ℃ of temperature and 800 ℃ is roughly equal.The result of Fig. 3 represents that the decoking in 600 ℃ of left and right of temperature is favourable if consider reactive and pipe arrangement material.
Fig. 4 is an example of result of implementing the thermal decomposition attachment method of removaling of present embodiment, means the gas temperature of diverse location of the pipe arrangement in air blast surface temperature (iron sheet temperature) and decoking and the curve map of the timeliness of iron sheet temperature variation.In the figure, transverse axis is the elapsed time, and the longitudinal axis is the oxygen concentration in the gas temperature of each instrumentation position or iron sheet temperature and oxidant.At air blast 14 entrances and the combustion furnace 13 entrance instrumentation gas temperatures of Fig. 2, in air blast 14, rake a (16a) and rake b (16b) instrumentation iron sheet temperature.
According to Fig. 4, at the decoking initial stage, the iron sheet temperature of the gas temperature at blower inlet place, air blast and rake a surpasses 500 ℃, so can judge in this part generation decoking.On the other hand, the iron sheet temperature of the rake b in rake a downstream and the gas temperature of combustion furnace entrance postpone than air blast and rake a and over 500 ℃.In addition, near through 16 hours, in the iron sheet temperature of rake b and the gas temperature of combustion furnace entrance, rise, in contrast, in the iron sheet temperature decline of blower inlet gas temperature, air blast and rake a.This is illustrated in upstream side decoking and roughly finishes, but continues decoking in downstream.Like this, from Fig. 4, can confirm that decoking starts to carry out from upstream side.
In this experiment, in decoking, make the oxygen concentration in oxidant drop to less than 5% (approximately 4.7%) from 12%, almost side by side the gas temperature of each portion and iron sheet temperature start to reduce with oxygen concentration decline, while again making oxygen concentration in oxidant rise to 12%, in gas temperature and the iron sheet temperature of each portion, rise.Its result represents, by making the oxygen concentration in oxidant change, can adjust gas temperature in decoking.
In the present embodiment, at the pipe arrangement inwall that vertical direction is obliquely installed relatively such as the contracted flow portion of pipe arrangement and the downside inwall of the pipe arrangement rake 16 shown in Fig. 2, easily pile up thermal decomposition attachment.In addition, in the situation that oxidant (mist) flows through pipe arrangement with low flow velocity, at the downside inwall of pipe arrangement rake, easily pile up the ash content producing by combustion decomposition.In the present embodiment, compressed air is sprayed in the position that also can easily pile up to thermal decomposition attachment and ash content in decoking.
Fig. 5 is the part sectioned view of pipe arrangement rake.On the top of pipe arrangement rake 16, be provided with two nozzles 20.Nozzle 20 is connected with air blast (not shown).The compressed air that in Fig. 5, nozzle 20 is configured to be supplied with by air blast contacts with the roughly the same position of the downside inwall of pipe arrangement rake 16.
For pipe arrangement rake 16, can said nozzle be set in the many places of airflow direction.The nozzle of airflow direction arranges interval and for example by analog computation, goes out the position or the distance till disappearing that from the compressed air of nozzle ejection, arrive pipe arrangement (thermal decomposition attachment) and determine.
Compressed-air actuated injection from nozzle 20 is for example implemented with specific time interval under the condition of pressure 0.5MPa left and right, ejaculation amount 200l/s.Injection interval considers to adhere to/pile up the suitably settings such as the rate of climb of the pressure loss producing.Utilize compressed air to clash into the collision of the accumulation horizon of thermal decomposition attachment, at the accumulation horizon that is formed at the thermal decomposition attachment of pipe arrangement downside inwall, crack.In addition, by combustion decomposition, produce and the ash content piled up side flow downstream together with compressed air.Thus, in the part having cracked, new reaction surface contacts with oxidant, promotes the combustion decomposition of thermal decomposition attachment.
In addition, from the compressed-air actuated injection of nozzle, also can in thermal decomposition gasification reaction, implement.Thus, on pipe arrangement inwall, before formed thermal decomposition attachment thickening, thermal decomposition attachment can be peeled off to removal.Its result can suppress thermal decomposition adhesion amount, and the temperature sharply in the time of can preventing decoking rises, and can further cut down decoking required time.
It is the partial combustion decomposition under low oxygen concentration that the thermal decomposition attachment of present embodiment is removed, and the waste gas instant heating decomposition gas therefore producing in above-mentioned thermal decomposition attachment is removed arrives the combustion furnace in downstream.Thermal decomposition gas is from the gas burner that is arranged on upper furnace to burning furnace injection, with the mixed combining combustion of the auxiliary fuels such as town gas of supplying with from upper furnace.Furnace temperature during thermal decomposition gas combustion is 700 ℃ of left and right.In thermal decomposition gas, comprise a large amount of CO, thus, CO completing combustion and generate CO
2, from combustion furnace, discharge.
Claims (9)
1. a thermal decomposition attachment removal method, in the thermal decomposition gasification system of living beings, to being arranged at pipe arrangement between thermal decomposition gasification furnace and combustion furnace, take normal temperature and supply with the inactive gas of oxygen concentration more than 5 volume % and below 13 volume % and the mist of oxygen, described mist is circulated in described pipe arrangement, at gas temperature, be more than 500 ℃ and the iron sheet temperature of described pipe arrangement is under the condition below 600 ℃, make to be attached to the thermal decomposition attachment burning on the inwall of described pipe arrangement and remove.
2. thermal decomposition attachment removal method as claimed in claim 1, wherein, is under the condition below 650 ℃, to remove described thermal decomposition attachment at described gas temperature.
3. thermal decomposition attachment removal method as claimed in claim 1, wherein, supplies with described mist to being arranged in the pipe arrangement of described pipe arrangement air blast upstream side midway.
4. thermal decomposition attachment removal method as claimed in claim 1, wherein, gas temperature in pipe arrangement described in a place of described pipe arrangement or many places instrumentation, this instrumentation to gas temperature at least one value while surpassing 650 ℃, make the oxygen concentration of the described mist that circulates in described pipe arrangement reduce to less than 5 volume %.
5. the thermal decomposition attachment removal method as described in any one in claim 1～4, wherein, sprays the compressed air of normal temperature to the inwall of the sloping portion of described pipe arrangement.
6. thermal decomposition attachment removal method as claimed in claim 1, wherein, described thermal decomposition attachment burning and the waste gas that produces mixes with auxiliary fuel in described combustion furnace, and in the more than 700 ℃ oxidized processing of temperature.
7. a thermal decomposition gasification system, is the thermal decomposition gasification system of living beings, wherein, possesses:
Thermal decomposition gasification furnace;
Be arranged on the combustion furnace in this thermal decomposition gasification furnace downstream;
Be arranged on the pipe arrangement between described thermal decomposition gasification furnace and described combustion furnace,
Also possess:
Oxidant supply port, is connected with described pipe arrangement, for supplying with the oxidant as the mist of inactive gas and oxygen to described pipe arrangement;
Oxidant adjustment part, for more than being adjusted into the oxygen concentration of described oxidant 5 volume % and below 13 volume %;
For the heating part that the inwall of described pipe arrangement is heated;
The temperature of the gas of the inner side circulation at described pipe arrangement is carried out to the gas temperature test section of instrumentation; And
For controlling the gas temperature control part of described gas temperature.
8. thermal decomposition gasification system as claimed in claim 7, wherein, described oxidant adjustment part possesses the mixing portion of mixing for being collected in the pipeline of the waste gas circulating in described pipe arrangement and the waste gas that this is collected and air.
9. thermal decomposition gasification system as claimed in claim 7, wherein, also possesses for spraying compressed-air actuated nozzle at the inwall of described pipe arrangement.
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| JP2009-196670 | 2009-08-27 | ||
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| JP6016367B2 (en) * | 2012-01-30 | 2016-10-26 | 三菱重工環境・化学エンジニアリング株式会社 | Method for suppressing generation of pyrolysis deposits in pyrolysis gasification system and pyrolysis gasification system |
| HK1202574A1 (en) | 2012-05-18 | 2015-10-02 | 日本蓝色能源株式会社 | Biomass gasifier device |
| CA2913293C (en) | 2013-07-11 | 2017-10-24 | Mitsubishi Heavy Industries Environmental & Chemical Engineering Co., Ltd. | Method for inhibiting occurrence of pyrolysis deposit in pyrolysis gasification system, and pyrolysis gasification system |
| US10059886B2 (en) | 2014-08-07 | 2018-08-28 | Inaeris Technologies, Llc | Rejuvenation of biopyrolysis oil hydroprocessing reactors |
| CN106001012B (en) * | 2016-06-03 | 2018-07-17 | 上海华钢不锈钢有限公司 | Hot removing system and the method for removing steel pipe internal-surface residue using it |
| JP7010676B2 (en) * | 2017-11-29 | 2022-01-26 | 川崎重工業株式会社 | Fluidized bed furnace |
| WO2022209196A1 (en) * | 2021-03-29 | 2022-10-06 | Ｕｂｅ三菱セメント株式会社 | Apparatus for carbonizing biomass |
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| CN102000681A (en) | 2011-04-06 |
| JP5713592B2 (en) | 2015-05-07 |
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