CN118347314B

CN118347314B - A rotary kiln waste heat recovery and drying device

Info

Publication number: CN118347314B
Application number: CN202410772432.8A
Authority: CN
Inventors: 冀代明; 李金元; 王新; 吴春玲; 宋月芳
Original assignee: Baotou Mingxin Technology Co ltd
Current assignee: Baotou Mingxin Technology Co ltd
Priority date: 2024-06-17
Filing date: 2024-06-17
Publication date: 2024-08-09
Anticipated expiration: 2044-06-17
Also published as: CN118347314A

Abstract

The application relates to the technical field of waste heat recovery and discloses a rotary furnace waste heat recovery and drying device, which comprises a collecting tank and a raw material bin, wherein a feeding pipe is arranged on the upper side wall of the collecting tank; the lower side wall of the collecting tank is provided with a discharge pipe; a first end cover is arranged at one port of the collecting tank, and a second end cover is arranged at the other port of the collecting tank; the first end cover is provided with a conical cover, the conical cover and the first end cover form an intermediate heat exchange cavity, the first end cover is provided with an air inlet assembly, and the air inlet end of the air inlet assembly is provided with a first Roots blower; the first end cover is provided with an air outlet assembly, the air outlet end of the air outlet assembly is connected with an internal heating assembly through a first air conveying pipe, the internal heating assembly is arranged in a raw material bin, and the raw material bin is used for storing zinc ore powder to be calcined; the waste heat collected by the application has high heat quantity and stable heat quantity, and the waste heat can preheat the raw materials to be fed for production, so that the calcination time and the calcination cost of the raw materials are reduced, the raw materials can be dried, the raw materials are prevented from being wetted, and the raw materials are properly stored.

Description

Rotary furnace waste heat recovery drying device

Technical Field

The invention belongs to parts of a rotary furnace, relates to the technical field of waste heat recovery, and in particular relates to a waste heat recovery and drying device of a rotary furnace.

Background

The furnace body of the rotary furnace is a steel cylinder, the lining is made of refractory materials, and the furnace body is supported on a plurality of pairs of riding wheels and has an inclination of 3% -6%; the gear of the furnace body is driven by a motor to slowly rotate; the materials are added from the higher tail end and discharged from the lower furnace end; the end of the furnace head is injected with fuel, the fuel is burnt in the furnace, and the smoke is discharged from the tail end of the higher furnace, so that the material and the smoke form countercurrent.

Rotary kiln is widely used in chemical industry for drying, dewatering and roasting materials, such as zinc oxide, namely, the rotary kiln is used for calcining a mixture of zinc ore powder and coal dust, so that zinc in the ore powder is reduced into zinc vapor, then air is introduced for oxidation, the generated zinc oxide is captured, and a zinc oxide finished product is prepared, and in the calcining process, the calcining temperature in the rotary kiln can reach 1300 ℃, and the generated waste heat is very considerable.

The chinese patent with application number 202021000686.1 discloses a rotary furnace waste heat recovery device for zinc oxide production, including the furnace body, furnace body left side top welding has the discharge gate, and furnace body right side tail end welding has the gas outlet, the outer wall of leaning on left side top department in the middle of the furnace body is equipped with air heating device, air heating device right side pipe connection has the draught fan, and the raw materials case has been placed on the draught fan right side, and the inside spiral drying tube that is equipped with of raw materials case.

But the furnace body is rotatory, consequently the hot air pipe can't hug closely the furnace body, and the heat of waste heat is lower, and the furnace body is in the external environment always, receives the influence of external environment great, leads to the waste heat of collecting unstable.

Disclosure of Invention

The invention aims to provide a rotary furnace waste heat recovery drying device, which solves the problems that the heat of waste heat proposed in the background art is low and the waste heat is greatly influenced by the external environment.

The technical scheme adopted by the invention is as follows: the waste heat recovery and drying device of the rotary furnace comprises a collecting tank and a raw material bin, wherein the collecting tank is horizontally arranged; the upper side wall of the collecting tank is provided with a feeding pipe which is connected with the kiln head cover; the lower side wall of the collecting tank is provided with a discharge pipe; a first end cover is arranged at one port of the collecting tank, and a second end cover is arranged at the other port of the collecting tank; the first end cover is provided with a conical cover, the conical cover and the first end cover form an intermediate heat exchange cavity, the first end cover is provided with an air inlet assembly, and the air inlet end of the air inlet assembly is provided with a first Roots blower; the first end cover is provided with an air outlet assembly, the air outlet end of the air outlet assembly is connected with an internal heating assembly through a first air conveying pipe, the internal heating assembly is arranged in a raw material bin, and the raw material bin is used for storing zinc ore powder to be calcined; the heat-cultured sand passes through the air inlet assembly and the air outlet assembly in the falling process and exchanges heat with the air conveyed in the air inlet assembly and the air outlet assembly.

The upper port of the bin body is provided with a powder inlet pipe; the lower port of the bin body is provided with a discharge valve; the bin body is provided with a supporting frame; the raw material bin is used for storing zinc mineral powder.

The first scraping plate component and the second scraping plate component have the same structure, the first scraping plate component comprises a circular plate, scraping holes are formed in the circular plate and are in sliding fit with the air inlet pipe, and the scraping holes are in sliding fit with the air outlet pipe; the side wall of the circular plate is provided with lugs, and the opposite lugs are fixed through connecting bolts; a first spring is arranged between the lugs at the left quadrant point and the right quadrant point; the lug is in sliding connection with the guide rod, the side wall of the circular plate is provided with a push plate, the push plate positioned on the outer side is contacted with the guide rod, and the guide rod intermittently pushes the push plate to displace.

Be equipped with first articulated seat on the push pedal, articulated on the first articulated seat have the connecting rod, the free end of connecting rod articulates there is the articulated seat of second, is equipped with the deflector on the articulated seat of second, and 2 deflector pass through a bull stick and establish ties, are equipped with the axle bed on the bull stick, and the axle bed is fixed with the inlet pipe of collection tank.

The side wall of the branch pipe is provided with a first valve; the side wall of the bypass pipe is provided with a second valve.

A supporting table is arranged on the feeding pipe; the supporting table is provided with a bearing plate, and the bearing plate is provided with a perforation; the top surface of the supporting table is provided with upright posts which are arranged in a matrix, a small-diameter section of each upright post is connected with a separating screen cylinder in a sliding manner, the separating screen cylinder is used for collecting falling heat-cultured sand, a fourth spring is sleeved on the small-diameter section of each upright post, and the fourth spring is used for supporting the separating screen cylinder; the top surface of the supporting table is provided with a Y-shaped seat, a shaft lever is rotationally connected between front forks of the Y-shaped seat, and the shaft lever is driven by a third motor; an eccentric cam is arranged on the shaft lever and is in rolling contact with the top surface of the separation screen cylinder.

The kiln head cover is provided with a flow guide pipe which is used for guiding the hot culture sand into the separation screen cylinder.

The application has the beneficial effects that: the waste heat collected by the application has high heat quantity and stable heat quantity, and the waste heat can preheat the raw materials to be fed for production, so that the calcination time and the calcination cost of the raw materials are reduced, the raw materials can be dried, the raw materials are prevented from being wetted, and the raw materials are properly stored.

Drawings

Fig. 1 is a schematic diagram of a front view structure of a rotary kiln.

Fig. 2 is a schematic diagram of a front view structure of the present application.

Fig. 3 is a schematic view of a cross-sectional front view of the collection tank.

Fig. 4 is a schematic view of a front sectional structure of the intake assembly.

Fig. 5 is a schematic perspective view of an air intake assembly.

Fig. 6 is a schematic view of a front cross-sectional structure of the air outlet assembly.

Fig. 7 is a schematic perspective view of the air outlet assembly.

Fig. 8 is a schematic side sectional structure of the air inlet pipe and the air outlet pipe.

Fig. 9 is a schematic diagram of a front view cross-section structure of a raw stock bin.

FIG. 10 is a schematic view showing a sectional front view of the circulation pipe and the screw auger.

Fig. 11 is a schematic view of a front cross-sectional structure of an internal heat assembly.

Fig. 12 is a schematic view of a sectional front view of a cylindrical cam on a rotating shaft.

Fig. 13 is a schematic top view of a cylindrical cam on a rotating shaft.

Fig. 14 is a schematic perspective view of the guide rail and guide bar.

Fig. 15 is a schematic side sectional structure of a disk and a lug.

Fig. 16 is a schematic perspective view of a first squeegee assembly and a second squeegee assembly.

Fig. 17 is a schematic diagram of the front view structure of the guide plate.

Fig. 18 is a schematic perspective view of a guide plate.

Fig. 19 is a schematic view showing a sectional front view of the burner and the secondary heat exchanger.

Fig. 20 is a schematic view of a front sectional structure of the secondary heat exchanger.

Fig. 21 is a schematic view of a front cross-sectional structure of the wind collecting hood.

Fig. 22 is a schematic view of a front sectional structure of the outer heat shield.

Fig. 23 is a schematic top sectional view of the outer heat shield.

Fig. 24 is a schematic view of a cross-sectional front view of the heat exchange box.

Fig. 25 is a schematic view of a front sectional structure of the dust removing pipe.

Fig. 26 is a schematic view of a sectional front view of a separation screen.

Fig. 27 is a schematic perspective view of an eccentric cam.

Fig. 28 is a schematic perspective view of a separation screen drum.

Fig. 29 is a schematic view of a cross-sectional front view of a draft tube.

In the figure: 1. a rotary kiln; 2. a gear supporting wheel; 3. a support device; 4. a transmission device; 5. a kiln head cover; 6. a kiln tail hood; 7. a collection tank; 8. a raw material bin; 9. support legs; 10. a feed pipe; 11. a discharge pipe; 12. a first end cap; 13. a second end cap; 14. a conical cover; 15. an intermediate heat exchange cavity; 16. an air intake assembly; 17. a first Roots blower; 18. an air outlet assembly; 19. a first gas pipe; 20. an internal heating assembly; 21. an air inlet pipe; 22. a first pipe joint; 23. a first gas-collecting channel; 24. an air outlet pipe; 25. a second pipe joint; 26. a second gas-collecting hood; 27. a bin body; 28. a powder inlet pipe; 29. a discharge valve; 30. a support frame; 31. a powder outlet pipe; 32. a circulation pipe; 33. a spiral auger; 34. a first motor; 35. a powder feeding pipe; 36. a support plate; 37. a through hole; 38. heating pipes; 39. a second gas pipe; 40. zhong Gai; 41. a rotating shaft; 42. a second motor; 43. a cylindrical cam; 44. a curved groove; 45. a guide rail; 46. a guide groove; 47. a slide; 48. a support rod; 49. ball head; 50. a guide rod; 51. guide sleeve; 52. a slide bar; 53. a first squeegee assembly; 54. a second squeegee assembly; 55. a first spring; 56. a circular plate; 57. scraping holes; 58. a lug; 59. a connecting bolt; 61. a push plate; 62. a first hinge base; 63. a connecting rod; 64. the second hinge seat; 65. a guide plate; 66. a rotating rod; 67. a shaft seat; 68. a third gas pipe; 69. a secondary heat exchanger; 70. a burner; 71. a main pipe; 72. an air inlet heat exchange tube; 73. an air outlet heat exchange tube; 74. a U-shaped tube; 75. a wind collecting hood; 76. a fourth gas pipe; 77. a second Roots blower; 78. a fifth gas pipe; 79. a conical tube; 80. a sixth gas delivery pipe; 81. a seventh gas delivery pipe; 82. an outer heat shield; 83. a connecting pipe; 84. an air outlet pipe; 85. a smoke inlet pipe; 86. a branch pipe; 87. a dust removal pipe; 88. a top cover; 89. an ash discharge valve; 90. a second spring; 91. a bypass pipe; 92. a smoke outlet pipe; 93. a centrifugal fan; 94. a heat exchange box; 95. an eighth gas delivery pipe; 96. a ninth gas delivery pipe; 97. a first valve; 98. a second valve; 99. a support table; 100. a carrying plate; 101. perforating; 102. a column; 103. a separation screen drum; 104. a fourth spring; 105. a Y-shaped seat; 106. a shaft lever; 107. a third motor; 108. an eccentric cam; 109. and a flow guiding pipe.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the like or similar elements throughout or elements having like or similar functionality; the embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

In the description of the present invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "circumferential," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the invention.

Furthermore, the terms "first," second, "" third, "" fourth, "" fifth, "" sixth, "" seventh, "" eighth, "and ninth" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; the specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

As shown in fig. 1, the side wall of the rotary furnace 1 is provided with a backing wheel 2, the backing wheel 2 is connected with a supporting device 3 in a rolling way, and the rotary furnace 1 is driven to rotate by a transmission device 4; a kiln head cover 5 is arranged at one end opening of the rotary furnace 1, and a kiln tail cover 6 is arranged at the other end opening.

As shown in fig. 2-3, in a first embodiment, a waste heat recovery and drying device for a rotary furnace comprises a collection tank 7 and a raw material bin 8, wherein the collection tank 7 is horizontally arranged, and a support leg 9 is arranged on the side wall of the collection tank 7; the upper side wall of the collecting tank 7 is connected with a feeding pipe 10, and the feeding pipe 10 is connected with the kiln head cover 5, so that hot (high-temperature) sand culture falls down through the kiln head cover 5 and enters the collecting tank 7; the lower side wall of the collecting tank 7 is connected with a discharge pipe 11, and the discharge pipe 11 is used for discharging the sand which is changed with waste heat in the collecting tank 7; preferably, the discharging pipe 11 is opposite to the feeding pipe 10, and the caliber of the discharging pipe 11 is larger than that of the feeding pipe 10, so that the whole sand culture is conveniently discharged; one port of the collecting tank 7 is connected with a first end cover 12 through a flange, and the other port of the collecting tank 7 is connected with a second end cover 13 through a flange; the first end cover 12 is connected with a conical cover 14, the conical cover 14 and the first end cover 12 form an intermediate heat exchange cavity 15, the first end cover 12 is provided with an air inlet assembly 16, the air inlet end of the air inlet assembly 16 extends out of the second end cover 13, and the air inlet end of the air inlet assembly 16 is connected with a first Roots blower 17; the first end cover 12 is provided with an air outlet assembly 18, the air outlet end of the air outlet assembly 18 extends out of the second end cover 13, the air outlet end of the air outlet assembly 18 is connected with an internal heat component 20 through a first air pipe 19, the internal heat component 20 is arranged in a raw material bin 8, and the raw material bin 8 is used for storing zinc ore powder or coal powder to be calcined; the air inlet assembly 16 and the air outlet assembly 18 form a screen-shaped structure, hot (high-temperature) sand culture passes through the air inlet assembly 16 and the air outlet assembly 18 in the falling process, and generates full heat exchange with air conveyed in the air inlet assembly 16 and the air outlet assembly 18.

As shown in fig. 4 and 5, as an optimization of the first embodiment, the air intake assembly 16 includes air intake pipes 21, the number of the air intake pipes 21 in the first embodiment is 8, the 8 air intake pipes 21 are arranged at equal angles, the shape of the air intake pipe 21 is a flat pipe, and the flat pipe can be replaced by a round pipe or a square pipe; the air inlet end of the air inlet pipe 21 is connected with a first pipe joint 22, a first air collecting cover 23 is connected to the first pipe joint 22, and the air inlet end of the first air collecting cover 23 is connected with the first Roots blower 17; the first Roots blower 17 injects air into the air inlet pipe 21, the air exchanges heat with hot (high temperature) sand during flowing, and the air enters the intermediate heat exchange cavity 15 and is discharged from the air outlet assembly 18.

As shown in fig. 6 to 8, as an optimization of the first embodiment, the air outlet assembly 18 includes air outlet pipes 24, the number of the air outlet pipes 24 in the first embodiment is 16, the 16 air outlet pipes 24 are arranged at equal angles, the air outlet pipes 24 are located at the outer ring of the air inlet assembly 16, the shape of the air outlet pipes 24 is a flat pipe, and the flat pipe can be replaced by a round pipe or a square pipe; the end of giving vent to anger of outlet duct 24 is connected with second coupling 25, is connected with second gas-collecting channel 26 on the second coupling 25, and the end of giving vent to anger of second gas-collecting channel 26 links to each other with first gas-supply pipe 19, through setting up outlet duct 24 for gaseous heat transfer with hot (high temperature) sand culture in the in-process that flows, and the quantity of outlet duct 24 is greater than the quantity of intake pipe 21, and the gas velocity of flow slows down, and heat transfer time gets longer, and the waste heat collection effect obtains promoting.

As shown in fig. 9, as an optimization of the first embodiment, the raw material bin 8 includes a bin body 27, the upper section of the bin body 27 is square-tube-shaped, and the lower section of the bin body 27 is conical-tube-shaped; the upper port of the bin body 27 is provided with a powder inlet pipe 28; the lower port of the bin body 27 is provided with a discharge valve 29; the bin body 27 is connected with a supporting frame 30; the raw material bin 8 is used for storing zinc mineral powder or coal dust.

As shown in fig. 10, as an optimization of the first embodiment, considering that the zinc ore powder of the raw material bin 8 is fixed, a powder outlet pipe 31 is arranged on the bin body 27, the powder outlet pipe 31 is positioned at a lower section taper pipe, a circulating pipe 32 is connected to the powder outlet pipe 31, the circulating pipe 32 is vertically arranged, a spiral auger 33 is rotationally connected to the circulating pipe 32, and the spiral auger 33 is driven by a first motor 34; the upper end of the circulating pipe 32 is connected with a powder feeding pipe 35, the powder feeding pipe 35 is used for feeding materials to the raw material bin 8, the spiral auger 33 circulates the zinc ore powder in the raw material bin 8, and the drying efficiency is improved.

As shown in fig. 11, as an optimization of the first embodiment, the internal heat assembly 20 comprises a supporting plate 36, wherein the supporting plate 36 is arranged in the raw material bin 8, and the supporting plate 36 does not influence the normal flow of zinc mineral powder; the supporting plate 36 is provided with a through hole 37, and the through hole 37 is used for being connected with the air outlet end of the first air pipe 19; the support plate 36 is connected with a heating pipe 38, the preferred heating pipe 38 is positioned in the center of the raw material bin 8, the upper side wall of the heating pipe 38 is connected with a second gas pipe 39, the second gas pipe 39 extends to the outside of the raw material bin 8, and the second gas pipe 39 is used for discharging gas of the heating pipe 38; the upper port of the heating pipe 38 is detachably provided with Zhong Gai and Zhong Gai is in a flat-top cone shape, and Zhong Gai can guide zinc ore powder falling from the powder feeding pipe 35, so that zinc ore powder in the raw material bin 8 is distributed around the heating pipe 38, and further heat dissipation and drying of the heating pipe 38 from inside to outside are realized.

As shown in fig. 12 to 14, as an optimization of the first embodiment, considering that the hot (high temperature) sand culture falls on the air inlet assembly 16 and the air outlet assembly 18 to accumulate the slag, the slag becomes thicker and affects the heat exchange efficiency, the first end cover 12 and the second end cover 13 are provided with a rotating shaft 41, the rotating shaft 41 is driven by a second motor 42, and the 2 second motors 42 are respectively fixed with the first end cover 12 and the second end cover 13; taking a rotating shaft 41 as an example, a cylindrical cam 43 is arranged on the side wall of the rotating shaft 41 positioned in the collecting tank 7, and a curve groove 44 is formed in the cylindrical cam 43; the guide rails 45 are arranged on the inner wall of the collecting tank 7, the number of the guide rails 45 is 2, the 2 guide rails 45 are symmetrically arranged, guide grooves 46 are formed in the guide rails 45, sliding seats 47 are connected to the guide grooves 46 in a sliding mode, supporting rods 48 are connected to the sliding seats 47, ball heads 49 are connected to the supporting rods 48, and the ball heads 49 are in sliding fit with the curve grooves 44; guide rods 50 are connected to two sides of the sliding seat 47, guide sleeves 51 are connected to the side walls of the guide rods 50 in a sliding manner, and the guide sleeves 51 are connected with the guide rails 45; the sliding rods 52 are installed in the gaps between the first end cover 12 and the second end cover 13, the number of the sliding rods 52 is 3 in the embodiment, and the 3 sliding rods 52 are positioned at the front quadrant point, the rear quadrant point and the lower quadrant point; the sliding rod 52 is connected with the first scraper component 53 and the second scraper component 54 in a sliding manner, the first scraper component 53 and the second scraper component 54 are pushed by the guide rod 50 to generate linear reciprocating motion, a first spring 55 is installed in a gap between the first scraper component 53 and the second scraper component 54, the first spring 55 has a resetting effect, and the first scraper component 53 and the second scraper component 54 scrape off the broken slag on the air inlet pipe 21 and the air outlet pipe 24, so that the heat exchange efficiency is effectively improved.

As shown in fig. 15 and 16, as an optimization of the first embodiment, the first scraper assembly 53 and the second scraper assembly 54 have the same structure, the first scraper assembly 53 includes at least two circular plates 56, the number of the circular plates 56 is at least two, the circular plates 56 are provided with scraping holes 57, the scraping holes 57 are in sliding fit with the air inlet pipe 21, and the scraping holes 57 are in sliding fit with the air outlet pipe 24; the side wall of the circular plate 56 is provided with lugs 58, the number of the lugs 58 is 3 in the embodiment, 3 lugs 58 are positioned at the left quadrant points, the right quadrant points and the lower quadrant points, and the opposite lugs 58 are fixed by connecting bolts 59; since the first squeegee assembly 53 and the second squeegee assembly 54 are identical in structure, the first spring 55 is mounted between the lugs 58 at the left and right quadrant points, the position of the first spring 55 being such that hot (high temperature) sand culture is reduced from being caught in the first spring 55; the lug 58 is in sliding connection with the guide rod 50, the side wall of the circular plate 56 is provided with a push plate 61, the push plate 61 is positioned at the upper quadrant point of the circular plate 56, the push plate 61 positioned at the outer side is contacted with the guide rod 50, and the guide rod 50 intermittently pushes the push plate 61 to displace; the clearance is realized to clear the slag on the air inlet pipe 21 and the air outlet pipe 24.

As shown in fig. 17 and 18, as an optimization of the first embodiment, considering that hot (high temperature) sand is vertically dropped on the air inlet pipe 21 and the air outlet pipe 24, the opposite 2 pushing plates 61 are provided with first hinging seats 62,2, the positions of the first hinging seats 62 are staggered, the first hinging seats 62 are hinged with connecting rods 63, the free ends of the connecting rods 63 are hinged with second hinging seats 64, the second hinging seats 64 are connected with guide plates 65,2, the guide plates 65 are connected in series through a rotating rod 66, the rotating rod 66 is connected with shaft seats 67, and the shaft seats 67 are fixed with the feed pipe 10 of the collecting tank 7; the angular rotation of the guide plate 65 intermittently moves along with the push plate 61 to disperse the vertically falling hot (high temperature) sand culture so as to improve the heat exchange efficiency of the air inlet assembly 16 and the air outlet assembly 18.

As shown in fig. 19, as an optimization of the first embodiment, considering that primary air of the rotary furnace 1 is all cold air entering the kiln at present, namely, the primary air is directly connected with a burner 70 of the rotary furnace 1, the primary air is blown into the burner 70, and no other links exist in the middle; the free end of the second air pipe 39 is connected with a third air pipe 68, the free end of the third air pipe 68 is connected with a secondary heat exchanger 69, the air outlet end of the secondary heat exchanger 69 is connected with a burner 70, the burner 70 stretches into the kiln hood 5 to heat, the waste heat of calcine is utilized to dry the materials in the raw material bin 8, the kiln inlet temperature of primary air is increased, the pulverized coal is combusted more fully, and combustion flame with better performance is obtained.

As shown in fig. 20, as an optimization of the first embodiment, the secondary heat exchanger 69 includes a main pipe 71, one port of the main pipe 71 is connected to the third gas pipe 68, the other port of the main pipe 71 is connected to the combustor 70, the main pipe 71 is connected to an inlet heat exchange pipe 72 and an outlet heat exchange pipe 73, the inlet heat exchange pipe 72 and the outlet heat exchange pipe 73 are Z-shaped, and the middle section plays a main role in heat exchange; the upper ports of the inlet heat exchange tube 72 and the outlet heat exchange tube 73 are communicated through a U-shaped tube 74; the secondary heat exchanger 69 can raise the temperature of the primary air and balance the temperature of the primary air entering the kiln.

As shown in fig. 21, as an optimization of the first embodiment, considering that part of waste heat on the outer wall of the furnace body of the rotary furnace 1 is not utilized, a wind collecting cover 75 is circumferentially arranged on the rotary furnace 1, the wind collecting cover 75 is in clearance fit with the rotary furnace 1, normal rotation of the rotary furnace 1 is not affected, and the wind collecting cover 75 is connected with a second Roots blower 77 through a fourth air pipe 76; the wind collecting cover 75 is connected with a conical pipe 79 through a fifth air pipe 78, the conical pipe 79 is fixed with the first end cover 12, the conical pipe 79 is used for covering the conical cover 14, and the waste heat of the side wall of the rotary furnace 1 is utilized to heat the gas in the middle heat exchange cavity 15, so that the heat exchange temperature of primary air is improved.

As shown in fig. 22 and 23, as an optimization of the first embodiment, the side wall of the conical tube 79 is connected to the intake heat exchange tube 72 through a sixth air delivery tube 80; the air outlet heat exchange tube 73 is connected with an outer heat cover 82 through a seventh air transmission tube 81, the outer heat cover 82 is fixed with the outer wall of the raw material bin 8, the adjacent outer heat covers 82 are communicated through a connecting tube 83, and one outer heat cover 82 is connected with an air outlet tube 84; through setting up sixth gas-supply pipe 80 and seventh gas-supply pipe 81 can be with the primary air balance temperature of going into the stove, and waste heat continues to carry backward to former feed bin 8, carries out the drying from former feed bin 8's outside, has further promoted the stoving effect.

As shown in fig. 24 and 25, as an optimization of the first embodiment, considering that in the use process of the rotary kiln 1, the generated flue gas is usually directly discharged, or is discharged after primary filtration, but the flue gas contains more heat, so that a great amount of resource waste is caused by direct discharge, the kiln tail cover 6 is connected with a flue gas inlet pipe 85, and the flue gas inlet pipe 85 is of an open end structure; the side wall of the smoke inlet pipe 85 is welded with symmetrically arranged branch pipes 86, and the free ends of the branch pipes 86 are welded with dust removing pipes 87; a top cover 88 is fixed on the upper port of the dust removing pipe 87 through bolts; the lower port of the dust removal pipe 87 is provided with an ash discharge valve 89; a second spring 90 which is arranged at intervals of 90 degrees is detachably arranged between the ash discharge valve 89 and the top cover 88, and the second spring 90 can be used for coating dust on the surface to remove dust in high-temperature flue gas; the side wall of the dust removing pipe 87 is welded with a bypass pipe 91; a smoke outlet pipe 92 is welded between the bypass pipes 91; the smoke outlet pipe 92 is of an open-ended structure, and a centrifugal fan 93 is connected to the smoke outlet pipe 92; the outer side wall of the dust removal pipe 87 is welded with a heat exchange box 94, one end of the heat exchange box 94 is connected with the fourth air pipe 76 through an eighth air pipe 95, the other end of the heat exchange box 94 is connected with the fifth air pipe 78 through a ninth air pipe 96, and the flue gas waste heat of the rotary furnace 1 is utilized to heat the gas in the middle heat exchange cavity 15, so that the heat exchange temperature of primary air is improved.

As shown in fig. 25, as an optimization of the first embodiment, a first valve 97 is installed on the side wall of the branch pipe 86; the side wall of the bypass pipe 91 is provided with a second valve 98; the first valve 97 and the second valve 98 on the same side can be closed to carry out ash cleaning operation on the dust removing pipe 87 on the closed side, and the dust removing pipe 87 on the non-closed side carries out dust removing operation, so that continuous production is realized.

As shown in fig. 26 to fig. 28, as an optimization of the first embodiment, considering that the hot (high temperature) sand culture directly falls down, the heat exchange duration is short, and the support table 99 is connected to the feed pipe 10; the supporting table 99 is provided with a bearing plate 100, and the bearing plate 100 is provided with a perforation 101; the top surface of the supporting table 99 is provided with upright posts 102 which are arranged in a matrix (4) way, the section of each upright post 102 is of a T-shaped structure, a small-diameter section of each upright post 102 is slidably connected with a separating screen cylinder 103, the separating screen cylinders 103 are used for collecting falling hot (high-temperature) sand culture, a small-diameter section of each upright post 102 is sleeved with a fourth spring 104, and the fourth springs 104 are used for supporting the separating screen cylinders 103; the top surface of the supporting table 99 is provided with Y-shaped seats 105, 2Y-shaped seats 105 are symmetrically arranged, a shaft lever 106 is rotationally connected between front forks of the Y-shaped seats 105, the shaft lever 106 is driven by a third motor 107, and the third motor 107 is positioned outside the feeding pipe 10; the shaft lever 106 is fixedly connected with eccentric cams 108 which are symmetrically arranged, the eccentric cams 108 are in rolling contact with the top surface of the separation screen cylinder 103, and the vibration process is as follows: the third motor 107 rotates, the eccentric cam 108 on the shaft rod 106 synchronously rotates, and the separation screen cylinder 103 is intermittently pressed down, so that the heat (high temperature) sand culture shaking separation in the separation screen cylinder 103 is realized, and the heat exchange time of the heat (high temperature) sand culture and the air inlet assembly 16 and the air outlet assembly 18 is delayed.

As shown in fig. 29, as an optimization of the first embodiment, a flow guide pipe 109 is connected to the kiln hood 5, and the flow guide pipe 109 is used for guiding hot (high temperature) sand into the separation screen 103.

Although the present invention has been described in detail with reference to the foregoing examples, it will be apparent to those skilled in the art that the foregoing embodiments may be modified and practiced in the field of the invention, and that certain modifications, equivalents, improvements and substitutions may be made thereto without departing from the spirit and principles of the invention.

Claims

1. A rotary kiln waste heat recovery and drying device, comprising a collecting tank (7) and a raw material bin (8), characterized in that: a feed pipe (10) is provided on the upper side wall of the collecting tank (7), and the feed pipe (10) is connected to a kiln head cover (5); a discharge pipe (11) is provided on the lower side wall of the collecting tank (7); a first end cover (12) is provided at one end of the collecting tank (7), and a second end cover (13) is provided at the other end of the collecting tank (7); a conical cover (14) is provided on the first end cover (12), and the conical cover (14) and the first end cover (12) form an intermediate heat exchange cavity (15); the first end cover (12) is provided with an air inlet assembly (16); the air inlet end of the air inlet assembly (16) is provided with a first Roots blower (17); the first end cover (12) is provided with an air outlet assembly (18); the air outlet end of the air outlet assembly (18) is connected to an internal heat component (20) via a first air delivery pipe (19); the internal heat component (20) is arranged inside the raw material bin (8); the hot culture sand passes through the air inlet assembly during the falling process. (16) and an air outlet assembly (18), and heat is exchanged with air transported in the air intake assembly (16) and the air outlet assembly (18); the air intake assembly (16) comprises an air intake pipe (21), an air intake end of the air intake pipe (21) is connected to a first pipe joint (22), a first air collecting hood (23) is connected to the first pipe joint (22), and an air intake end of the first air collecting hood (23) is connected to a first Roots blower (17); the air outlet assembly (18) comprises an air outlet pipe (24), and the air outlet pipe (24) The outer ring of the air intake assembly (16) is located; a second pipe joint (25) is provided at the outlet end of the air outlet pipe (24); a second air collecting hood (26) is provided on the second pipe joint (25); the outlet end of the second air collecting hood (26) is connected to the first air delivery pipe (19); a rotating shaft (41) is provided on the first end cover (12) and the second end cover (13); the rotating shaft (41) is driven by a second motor (42); a cylindrical cam (43) is provided on the side wall of the rotating shaft (41) located in the collecting tank (7); The column cam (43) has a curved groove (44); the inner wall of the collecting tank (7) is provided with a guide rail (45), the guide rail (45) has a guide groove (46), a slide seat (47) is slidably connected to the guide groove (46), a support rod (48) is provided on the slide seat (47), a ball head (49) is provided on the support rod (48), and the ball head (49) is slidably matched with the curved groove (44); guide rods (50) are provided on both sides of the slide seat (47), and the side walls of the guide rods (50) are slidably connected to guide sleeves (51). 1, the guide sleeve (51) is connected to the guide rail (45); a sliding rod (52) is provided in the gap between the first end cover (12) and the second end cover (13); a first scraper assembly (53) and a second scraper assembly (54) are slidably connected to the sliding rod (52); the first scraper assembly (53) and the second scraper assembly (54) are pushed by the guide rod (50) to generate linear reciprocating motion; a first spring (55) is provided in the gap between the first scraper assembly (53) and the second scraper assembly (54); The feed pipe (10) is connected to a support platform (99); a bearing plate (100) is installed on the support platform (99), and a perforation (101) is processed on the bearing plate (100); a matrix-arranged column (102) is installed on the top surface of the support platform (99), the cross section of the column (102) is a T-shaped structure, and a separation sieve cylinder (103) is slidably connected to the small diameter section of the column (102), and the separation sieve cylinder (103) is used to collect the fallen hot sand. The small diameter section is sleeved with a fourth spring (104), and the fourth spring (104) is used to support the separation screen drum (103); a Y-shaped seat (105) is installed on the top surface of the support platform (99), and a shaft (106) is rotatably connected between the front forks of the Y-shaped seat (105), and the shaft (106) is driven by a third motor (107); symmetrically arranged eccentric cams (108) are fixedly connected to the shaft (106), and the eccentric cams (108) are in rolling contact with the top surface of the separation screen drum (103).

2. A rotary kiln waste heat recovery and drying device according to claim 1, characterized in that: the raw material bin (8) includes a bin body (27); a powder outlet pipe (31) is provided on the bin body (27), a circulation pipe (32) is provided on the powder outlet pipe (31), a spiral auger (33) is rotatably connected in the circulation pipe (32), and the spiral auger (33) is driven by a first motor (34); a powder feeding pipe (35) is connected to the upper end of the circulation pipe (32), and the powder feeding pipe (35) is used to feed materials into the raw material bin (8).

3. A rotary kiln waste heat recovery and drying device according to claim 1, characterized in that: the internal heat component (20) includes a support plate (36); a through hole (37) is opened on the support plate (36), and the through hole (37) is used to connect the gas outlet end of the first gas pipe (19); a heating pipe (38) is provided on the support plate (36), and a second gas pipe (39) is provided on the upper side wall of the heating pipe (38), and the second gas pipe (39) extends to the outside of the raw material bin (8); a bell cover (40) is provided at the upper end of the heating pipe (38).

4. A rotary kiln waste heat recovery and drying device according to claim 3, characterized in that: a third gas pipe (68) is provided at the free end of the second gas pipe (39), and a secondary heat exchanger (69) is provided at the free end of the third gas pipe (68); the secondary heat exchanger (69) comprises a main pipe (71), and an air inlet heat exchange pipe (72) and an air outlet heat exchange pipe (73) are provided on the main pipe (71); upper ends of the air inlet heat exchange pipe (72) and the air outlet heat exchange pipe (73) are connected through a U-shaped pipe (74); a burner (70) is provided at the air outlet end of the main pipe (71), and the burner (70) extends into the kiln head cover (5) for heating.

5. A rotary kiln waste heat recovery and drying device according to claim 4, characterized in that: an air collecting hood (75) is provided in the circumferential direction of the rotary kiln (1), and the air collecting hood (75) is connected to the second Roots blower (77) through a fourth air supply pipe (76); a conical tube (79) is connected to the air collecting hood (75) through a fifth air supply pipe (78), the conical tube (79) is fixed to the first end cover (12), and the conical tube (79) is used to cover the conical hood (14).

6. A rotary kiln waste heat recovery and drying device according to claim 5, characterized in that: the side wall of the tapered tube (79) is connected to the air inlet heat exchange pipe (72) through a sixth air supply pipe (80); the air outlet heat exchange pipe (73) is connected to an outer heat cover (82) through a seventh air supply pipe (81), the outer heat cover (82) is fixed to the outer wall of the raw material bin (8), adjacent outer heat covers (82) are connected through a connecting pipe (83), and one of the outer heat covers (82) is connected to an air outlet pipe (84).

7. A rotary kiln waste heat recovery and drying device according to claim 6, characterized in that: a smoke inlet pipe (85) is provided on the kiln tail cover (6) of the rotary kiln (1); a symmetrically arranged branch pipe (86) is provided on the side wall of the smoke inlet pipe (85); a dust removal pipe (87) is provided at the free end of the branch pipe (86); a top cover (88) is provided at the upper end of the dust removal pipe (87); an ash discharge valve (89) is provided at the lower end of the dust removal pipe (87); a valve (89) is provided between the ash discharge valve (89) and the top cover (88); A second spring (90) is provided; a bypass pipe (91) is provided on the side wall of the dust removal pipe (87); a smoke outlet pipe (92) is provided between the bypass pipes (91); a centrifugal fan (93) is provided on the smoke outlet pipe (92); a heat exchange box (94) is provided on the outer side wall of the dust removal pipe (87); one end of the heat exchange box (94) is connected to the fourth gas supply pipe (76) through an eighth gas supply pipe (95), and the other end of the heat exchange box (94) is connected to the fifth gas supply pipe (78) through a ninth gas supply pipe (96).