CN109282642B - Indirect heating rotary furnace for drying lignite - Google Patents
Indirect heating rotary furnace for drying lignite Download PDFInfo
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- CN109282642B CN109282642B CN201811115083.3A CN201811115083A CN109282642B CN 109282642 B CN109282642 B CN 109282642B CN 201811115083 A CN201811115083 A CN 201811115083A CN 109282642 B CN109282642 B CN 109282642B
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- 239000003077 lignite Substances 0.000 title claims abstract description 48
- 238000010438 heat treatment Methods 0.000 title claims abstract description 42
- 238000001035 drying Methods 0.000 title claims abstract description 33
- 238000007789 sealing Methods 0.000 claims abstract description 58
- 238000007599 discharging Methods 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 15
- 238000005096 rolling process Methods 0.000 claims abstract description 11
- 230000005540 biological transmission Effects 0.000 claims abstract description 7
- 230000000903 blocking effect Effects 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 230000003068 static effect Effects 0.000 claims description 15
- 239000011261 inert gas Substances 0.000 claims description 13
- 238000003825 pressing Methods 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims 2
- 239000002994 raw material Substances 0.000 abstract description 4
- 239000003245 coal Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 230000018044 dehydration Effects 0.000 description 4
- 238000006297 dehydration reaction Methods 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/06—Rotary-drum furnaces, i.e. horizontal or slightly inclined adapted for treating the charge in vacuum or special atmosphere
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/32—Arrangement of devices for charging
- F27B7/3205—Charging
Abstract
The invention discloses an indirect heating rotary furnace for drying lignite, which comprises a furnace body, wherein a plurality of rolling rings are arranged on the furnace body and are respectively supported by a riding wheel device and a riding wheel blocking device; a transmission device for driving the furnace body to continuously rotate on the riding wheel blocking device and the riding wheel device is arranged outside the middle section of the furnace body; the front end of the furnace body is provided with a feeding mechanism, the outside of the rear section is provided with a discharging mechanism, and a combined sealing mechanism and a flexible sealing mechanism are respectively arranged between the furnace body and the feeding mechanism and between the furnace body and the discharging mechanism; the heating system is arranged in the furnace body and is communicated with a rotary joint at the tail part of the furnace body, lignite is fed into a heating zone in the furnace body through the feeding mechanism, and materials are heated through steam in a tube bundle of the heating system, so that the lignite in the furnace body is indirectly dried. Compared with the common external heating rotary furnace, the heat exchange area of the equipment is 3-5 times higher, the raw materials are heated uniformly, and the heat exchange efficiency is high; the continuous and stable operation of the equipment for a long time can be ensured, and the blanking is continuous and uniform.
Description
Technical Field
The invention relates to an indirect heating rotary furnace, in particular to an indirect heating rotary furnace which is airtight, has heat exchange by a tube array in the furnace and has heat preservation outside the furnace body.
Background
Lignite belongs to coal types with low coalification degree, lignite contains high moisture, lignite dehydration and drying can effectively improve lignite quality, and in view of large lignite burying capacity and low surface mining cost, attention and research on lignite dehydration and drying upgrading technology are increased in recent years, basic research and intermediate experiments in the field are actively conducted in Europe, japan, australia, the United states and the like, and lignite dehydration and drying has become an important research subject in coal chemical industry.
In the process of dewatering and drying lignite, external moisture is easy to remove, and the inherent moisture and crystal water contained in minerals are difficult to remove. The dehydration and drying process of lignite is accompanied by some physical and chemical changes of the lignite. When the lignite is heated to more than 100 ℃ from normal temperature, external moisture can be evaporated; thus the water content can be reduced to 15%. And when the lignite is heated to be higher than 180 ℃, the bound water in the lignite can be removed. Because of the strong binding force between lignite and bound water, the removal of bound water requires higher temperature and energy.
At present, the relatively mature lignite drying technology at home and abroad mainly comprises the following steps of
1) High temperature flue gas rotary cylinder drying, normal temperature raw coal enters from the inlet of the drying cylinder, the raw coal forms a material curtain in the cylinder body by the shoveling plate on the furnace wall, and the flue gas is directly contacted with the raw coal for drying. The technology is mature, the operation is stable, but the equipment has large volume and weight, low evaporation intensity and easy explosion, and is not suitable for drying lignite with high volatile content.
2) In the rotary tube type drying technology, raw coal is uniformly distributed into a plurality of drying tubes in a rotary roller through a distributor, the raw coal moves by diversion through spiral blades in the tubes, superheated steam is introduced around the drying tubes, and the raw coal is dried through indirect heat exchange. The whole drying process of the process is safer, the drying area is increased, but the raw coal has the particle size requirement (less than or equal to 6 mm), the equipment is complex to manufacture, and the maintenance is difficult.
3) In the drying technology of the steam fluidized bed, superheated steam is blown in a fluidized bed dryer, so that lignite flows generate fluidization phenomenon in a fluidized bed, the steam takes away moisture evaporated in the lignite, the moisture passes through a cyclone separator to be partially returned for reuse, and the latent heat of circulating steam is completely used in the technical process, so that the heat energy utilization rate is greatly improved, but the difficult problems of easy spontaneous combustion and water re-absorption cannot be solved.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a closed indirect heating type tubular rotary furnace. The equipment is a completely airtight rotary furnace which indirectly heats materials by virtue of the pipe wall, the heat exchange area is 3-5 times higher than that of a common external heating rotary furnace, the raw materials are heated uniformly, and the heat exchange efficiency is greatly improved; the inside of the device is filled with preheated inert carrier gas, so that the danger caused by overhigh oxygen content of the dry tail gas is prevented, the device can continuously and stably operate for a long time, and the discharging is continuous and uniform.
The invention is realized by the following technical scheme.
An indirect heating rotary furnace for drying lignite comprises a furnace body, wherein a plurality of rolling rings are arranged on the furnace body and are respectively supported by a riding wheel device and a retaining riding wheel device; a transmission device for driving the furnace body to continuously rotate on the riding wheel blocking device and the riding wheel device is arranged outside the middle section of the furnace body; the front end of the furnace body is provided with a feeding mechanism, the outside of the rear section is provided with a discharging mechanism, and a combined sealing mechanism and a flexible sealing mechanism are respectively arranged between the furnace body and the feeding mechanism and between the furnace body and the discharging mechanism; the heating system is arranged in the furnace body and is communicated with a rotary joint at the tail part of the furnace body, lignite is fed into a heating zone in the furnace body through the feeding mechanism, and materials are heated through steam in a tube bundle of the heating system, so that the lignite in the furnace body is indirectly dried.
For the above technical solution, the present invention is further preferred:
further, the heating system comprises a central tube, and a steam inlet ring pipe and a water return ring pipe which are distributed along the central tube, wherein the steam inlet ring pipe and the water return ring pipe are respectively communicated with a steam inlet pipe bundle and a water return pipe bundle which extend to the inner cavity of the furnace body, the steam inlet pipe bundles and the water return pipe bundles are uniformly distributed in the furnace body and supported by pipe racks fixed on the furnace body, and each pipe rack is divided into a plurality of pieces of staggered arranged on the inner wall of the furnace body.
Further, the rotary joint is communicated with the central tube, and a steam inlet and a condensate outlet are arranged on the rotary joint.
Further, the feeding mechanism comprises a feeding conveyor erected on the feeding trolley, and the feeding conveyor extends to the inner cavity of the furnace body; the device also comprises an inert gas inlet arranged on the furnace end.
Further, an inert gas outlet and a discharge box are arranged at the rear part of the furnace body.
Further, a combined sealing mechanism arranged between the furnace body and the feeding mechanism adopts a combination of a compensator and a mechanical seal, wherein the mechanical seal is in a double sealing surface structure of a movable ring and a static ring; the movable ring is tightly attached to the stationary ring sealing surface and is fixed through a supporting frame, the stationary ring sealing surface is provided with an oil groove, and two sides of the stationary ring sealing surface are provided with oil injection holes; the static ring support frame is connected with a cylinder and a compensator.
Further, a flexible sealing mechanism arranged between the furnace body and the discharging mechanism comprises a cone flange connected with the discharging box, a plurality of semi-rigid plates are connected along the circumferential direction of the cone flange, and flexible plates are arranged on the inner sides of the semi-rigid plates; the inner side of the flexible board is provided with a heat-resistant plate; a wear-resistant sealing block closely attached to the furnace body sealing ring plate is arranged below the heat-resistant plate; the steel wire ropes fixed by the hooks are wound outside the semi-rigid plates, and balancing weights are added at the two ends of the steel wire ropes.
Further, semi-rigid board one end passes through clamp plate II and cone flange joint, and the other end passes through clamp plate I and is connected with wear-resisting sealing block, and clamp plate I and clamp plate II are fixed by sealing block mounting.
Further, a wind deflector is provided below the heat-resistant plate.
Further, the furnace body is installed in an inclined mode, materials enter from the high-point end of the furnace body, are directly fed into the furnace body through the feeding conveyor, and are fed to the low-point end of the furnace body along with rotation of the furnace body.
Compared with the prior art, the invention has the beneficial effects that:
1) The combined sealing mechanism is adopted in the furnace end of the equipment, so that materials, raw materials and products are separated by a closed reaction space, the raw materials and the products are not polluted by the outside, and meanwhile, preheated inert gas is introduced into the furnace, so that the condition of inflammability of lignite after drying is effectively prevented, and the operation safety of the equipment is ensured.
2) The heating mode is indirect heating of steam in the wall of the furnace body, so that the heat efficiency is greatly improved, the steam is convenient to control the temperature, and the material reaches the ideal drying temperature.
3) The two ends of the discharging box are sealed in a flexible double-layer sealing mode, so that the device has good sealing performance, and environmental pollution is reduced.
4) The tubes are uniformly arranged in the furnace, so that the lignite is uniformly heated and has high thermal efficiency, the equipment specification is effectively reduced, the productivity is improved, and the investment cost is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate and do not limit the invention, and together with the description serve to explain the principle of the invention:
FIG. 1 is a schematic structural view of a rotary kiln for indirectly heating lignite through the outer wall of a closed tube nest of the invention;
FIG. 2 is a schematic diagram of a cartridge assembly and heating system configuration;
FIG. 3 is a schematic view of a feed seal configuration;
FIG. 4 is a schematic view of the sealing structure of the two ends of the discharge box.
The reference numerals in the drawings are as follows: 1. a feed conveyor; 2. a feeding trolley; 3. sealing the feed; 4. a rolling ring I; 5. a large gear ring; 6. a gear cover; 7. a rolling ring II; 8. a furnace body; 9. a heating system; 10. a rotary joint; 11. a rotary joint support; 12. discharging and sealing; 13. a discharging box; 14. a supporting roller device; 15. a transmission device; 16. a riding wheel device; 17. an inert gas inlet; 18. a backwater tube bundle; 19. a steam inlet tube bundle; 20. a pipe rack; 21. an inert gas outlet; 22. a steam inlet ring pipe; 23. a backwater ring pipe; 24. a steam inlet; 25. a condensed water outlet; 26. a central tube; 27. an opening of the furnace body; 28. a cylinder; 29. a compensator; 30. a stationary ring support frame; 31. an oil filling hole; 32. a stationary ring; 33. a moving ring; 34. a movable ring support frame; 35. an oil groove; 36. sealing ring plates; 37. a wear-resistant sealing block; 38. a wind deflector; 39. a flexible board; 40. a pressing plate I; 41. a seal block fixing member; 42. a wire rope; 43. a hook; 44. a semi-rigid plate; 45. a pressing plate II; 46. a cone flange; 47. and (5) a heat-resistant plate.
Detailed Description
The present invention will now be described in detail with reference to the drawings and the specific embodiments thereof, wherein the exemplary embodiments and descriptions of the present invention are provided for illustration of the invention and are not intended to be limiting.
As shown in figure 1, the main body of the rotary kiln for indirectly heating lignite by the outer wall of the closed tube nest is a kiln body 8, a rolling ring I4 and a rolling ring II 7 are arranged on the kiln body 8, the number of the rolling rings can be increased according to the length of the kiln body 8 and the bending stress applied to the kiln body, and the rolling ring I4 and the rolling ring II 7 are respectively supported by a riding wheel device 16 and a riding wheel blocking device 14; the large gear ring 5 is arranged on the furnace body 8 close to the supporting roller device 14, and drives the furnace body 8 to continuously rotate on the supporting roller device 14 and the supporting roller device 16 through meshed transmission with a pinion gear of the transmission device 15; the gear cover 6 is used for protecting the large gear ring 5; the main motor in the transmission device 15 adopts a variable frequency speed regulating motor, and can meet the requirements of the rotating speed of the furnace body 8 under different working conditions. The front end of the furnace body 8 is provided with a feeding conveyor 1, a feeding trolley 2, a feeding seal 3 and the like; the outside of the rear section of the furnace body 8 is provided with a discharging box 13, two end surfaces of the discharging box are provided with discharging seals 12, and a temperature measuring device, a pressure measuring device and the like can be additionally arranged according to requirements. A combined sealing mechanism and a flexible sealing mechanism are respectively arranged between the furnace body 8 and the feeding mechanism and the discharging mechanism; a heating system 9 is arranged in the furnace body 8, the heating system 9 is communicated with a rotary joint 10 arranged at the rear end of the furnace body, and the rotary joint 10 and a rotary joint bracket 11 thereof are used for entering and exiting heat-carrying steam of the heating system 9. And the lignite is fed into a heating zone in the furnace body 8 through a feeding mechanism, and materials are heated through steam in a tube bundle of the heating system 9, so that the lignite in the furnace body is indirectly dried.
As shown in fig. 2, the cylinder device consists of a furnace body 8 and a built-in heating system 9, wherein the heating system 9 consists of a pipe frame 20, a steam inlet pipe bundle 19, a water return pipe bundle 18, a steam inlet ring pipe 22, a water return ring pipe 23, a central pipe 26 and the like. A steam inlet ring pipe 22 and a water return ring pipe 23 are distributed along the central pipe 26, and the steam inlet ring pipe 22 and the water return ring pipe 23 are respectively communicated with a steam inlet pipe bundle 19 and a water return pipe bundle 18 which extend to the inner cavity of the furnace body 8, and the steam inlet pipe bundle 19 and the water return pipe bundle 18 are uniformly distributed in the furnace body and supported by a pipe rack 20 fixed on the furnace body 8. The rotary joint 10 is communicated with a central pipe 26, and a steam inlet 24 and a condensate outlet 25 are arranged on the rotary joint 10. The heating steam indirectly transfers heat to the lignite through a tube bundle loop in the furnace body, has higher heat utilization rate, and is supplied to the lignite to be heated uniformly in the furnace body, and condensed water generated after heat exchange of the steam is discharged through the rotary joint 10. The dried lignite is sent into a heating area in a furnace body 8 by a feeding conveyor 1, the lignite moves towards the tail of the furnace in the furnace body, the drying process is completed by heat transfer of heating steam in a tube bundle to the tube wall, and finally the lignite enters a discharging box 13 from a furnace opening 27 and is sent to the next process.
Heating steam enters a central tube 26 of the heating system 9 from a steam inlet 24 of the rotary joint 10, steam inlet circular tubes 22 are evenly distributed to a plurality of steam inlet tube bundles 19 to heat and dry lignite, steam condensate water after heat exchange flows out from a condensate water outlet 25 of the rotary joint 10 through a water return tube bundle 18, and materials are heated and dried in a countercurrent mode, so that the drying effect is optimized; the rotary joint 10 has the function of realizing continuous inlet and discharge of heating steam and condensed water of the furnace body under the rotary working condition and realizing the drying process of materials. The support of the rotary joint support 11 adopts elastic support to eliminate damage to the rotary joint seal caused by radial runout.
The steam inlet tube bundle 19 and the water return tube bundle 18 are supported by a tube rack 20 fixed on the furnace body 8, so that the tube bundles are not bent, and meanwhile, the tube bundles are movably sleeved on the tube rack 20 so as to be freely telescopic in the process of thermal expansion and cold contraction. Each rake 20 is divided into a plurality of pieces which are staggered on the inner wall of the furnace body 8, so that the smooth flow of materials in the furnace body 8 can be ensured. The tube bundle material is a heat-resistant material; the tube bundle is provided with a structural design for eliminating thermal expansion and contraction.
The feeding mechanism comprises a feeding conveyor 1 arranged on a feeding trolley 2, and the feeding conveyor 1 extends to the inner cavity of a furnace body 8. The feeding device is provided with a circumferential channel, and preheated inert gas is introduced into the furnace body through the circumferential channel and is discharged from the top of the tail discharge box. The rear part of the furnace body 8 is provided with an inert gas outlet 21 and a discharge box 13, and the top of the discharge box discharges water vapor and dust and enters a dust removal system. Solid materials are discharged from the bottom of the discharging box, and discharging seals are arranged at two ends of the discharging box to prevent dust leakage. Inert gas enters the furnace body 8 through the inert gas inlet 17 and is discharged through the inert gas outlet 21 to enter the subsequent process. The inert gas is introduced into the furnace body 8, so that the condition that brown coal is inflammable after being dried is effectively prevented, and the safety of equipment operation is ensured.
As shown in FIG. 3, the furnace end adopts various sealing combination structures such as a compensator, a mechanical seal and the like to ensure the sealing performance of the furnace body. The combined sealing mechanism of the furnace body 8 and the feeding mechanism adopts a compensator and mechanical seal combination, and the mechanical seal is in a double sealing surface structure of a movable ring and a static ring; the sealing surfaces of the movable ring 33 and the static ring 32 are tightly attached and fixed by a supporting frame, the sealing surface of the static ring 32 is provided with an oil groove 35, and two sides of the sealing surface are provided with oil injection holes 31; a cylinder 28 and a compensator 29 are connected to the stationary ring support frame. When the equipment runs, the furnace body 8 is heated and expanded, the movable ring 33 is fixed on the movable ring support frame 34, the movable ring support frame 34 is fixed on the furnace body 8, the movable ring 33 and the stationary ring 32 are tightly attached to each other along with the thermal expansion of the furnace body 8, and meanwhile, the compensator 29 is pressed and contracted to adjust and compensate the elongation of the furnace body 8 due to the heated expansion; after the furnace body 8 stretches stably, the cylinder 28 arranged on the static ring support frame 30 pushes the static ring 32 in a certain reverse direction, so that the static ring 32 is always clung to the movable ring 33, and the oil filling holes 31 arranged on two sides of the static ring 32 and the oil grooves 35 arranged on the sealing surfaces ensure that lubricating grease automatically supplied by a lubricating system forms good lubrication and sealing between the two sealing surfaces of the static ring 32 and the movable ring 33, and the sealing safety and reliability are ensured.
As shown in fig. 4, the sealing at two ends of the discharging box adopts a flexible sealing mode, and comprises a cone flange 46 connected with the discharging box 13, a plurality of semi-rigid plates 44 are connected along the circumferential direction of the cone flange 46, and flexible plates 39 are arranged on the inner sides of the semi-rigid plates 44; the flexible board 39 is provided with a heat-resistant board 47 inside; the flexible plate 39, the heat-resistant plate 47 and the plurality of semi-rigid plates 44 are connected with the wear-resistant sealing block 37 on one side through the pressing plate I40 and the sealing block fixing piece 41, the other side is connected with the cone flange 46 through the pressing plate II 45 and the sealing block fixing piece 41, the wear-resistant sealing block 37 is tightly attached to the furnace body sealing ring plate 36 under the action of the flexible plate 39, the heat-resistant plate 47 and the semi-rigid plates 44, the externally wound steel wire rope 42 is fixed by the hooks 43 and used for tightening gaps among the plurality of semi-rigid plates 44, the balancing weights are added at the two ends of the steel wire rope 42 to adjust the attachment between the wear-resistant sealing block 37 and the furnace body sealing ring plate 36, so that the sealing performance is ensured, the wear-resistant sealing block 37 cannot be worn too fast, the wind shield 38 is built under the heat-resistant plate 47, positive pressure gas generated occasionally is operated, vortex is generated at the place, and resistance is reduced, and a large amount of leakage is reduced.
As shown in fig. 1, the whole furnace body 8 is obliquely arranged, materials enter from the high-point end of the furnace body 8, are directly fed into the furnace body 8 through the feeding conveyor 1, and are fed to the low-point end of the furnace body 8 along with the rotation of the furnace body 8.
It should be noted that: while the invention has been described in detail with reference to the foregoing embodiments, it will be apparent to one skilled in the art that modifications may be made to the invention and equivalents thereof without departing from the spirit, principles and spirit of the invention.
Claims (7)
1. An indirect heating rotary kiln for drying lignite, which is characterized in that: comprises a furnace body (8), wherein a plurality of rolling rings are arranged on the furnace body (8), and the rolling rings are respectively supported by a riding wheel device (16) and a riding wheel blocking device (14); a transmission device (15) for driving the furnace body (8) to continuously rotate on the riding wheel blocking device (14) and the riding wheel device (16) is arranged outside the middle section of the furnace body (8); the front end of the furnace body (8) is provided with a feeding mechanism, the outside of the rear section is provided with a discharging mechanism, and a combined sealing mechanism and a flexible sealing mechanism are respectively arranged between the furnace body (8) and the feeding mechanism and between the furnace body and the discharging mechanism;
the flexible sealing mechanism arranged between the furnace body (8) and the discharging mechanism comprises a cone flange (46) connected with the discharging box (13), a plurality of semi-rigid plates (44) are connected along the circumferential direction of the cone flange (46), and flexible plates (39) are arranged on the inner sides of the semi-rigid plates (44); a heat-resistant plate (47) is arranged on the inner side of the flexible plate (39); a wind deflector (38) is arranged below the heat-resistant plate (47); a wear-resistant sealing block (37) tightly attached to the furnace body sealing ring plate (36) is arranged below the heat-resistant plate (47); steel wire ropes (42) fixed by hooks (43) are wound on the plurality of semi-rigid plates (44), and balancing weights are added at two ends of the steel wire ropes (42);
the heating furnace comprises a furnace body (8), and is characterized in that a heating system (9) is arranged in the furnace body (8), the heating system (9) comprises a central pipe (26), and a steam inlet ring pipe (22) and a water return ring pipe (23) which are distributed along the central pipe (26), the steam inlet ring pipe (22) and the water return ring pipe (23) are respectively communicated with a steam inlet pipe bundle (19) and a water return pipe bundle (18) which extend to the inner cavity of the furnace body (8), the steam inlet pipe bundles (19) and the water return pipe bundles (18) are uniformly distributed in the furnace body and are supported by pipe racks (20) fixed on the furnace body (8), and each pipe rack (20) is divided into a plurality of pieces which are staggered on the inner wall of the furnace body (8);
the heating system (9) is communicated with a rotary joint (10) at the tail of the furnace body (8), lignite is fed into a heating zone in the furnace body (8) through a feeding mechanism, and materials are heated through steam in a tube bundle of the heating system (9), so that indirect drying of the lignite in the furnace body is completed.
2. The indirectly heated rotary kiln for drying lignite according to claim 1 wherein: the rotary joint (10) is communicated with the central pipe (26), and the rotary joint (10) is provided with a steam inlet (24) and a condensate outlet (25).
3. The indirectly heated rotary kiln for drying lignite according to claim 1 wherein: the feeding mechanism comprises a feeding conveyor (1) arranged on a feeding trolley (2), and the feeding conveyor (1) extends to the inner cavity of the furnace body (8); also comprises an inert gas inlet (17) arranged at the furnace end.
4. The indirectly heated rotary kiln for drying lignite according to claim 1 wherein: an inert gas outlet (21) and a discharge box (13) are arranged at the rear part of the furnace body (8).
5. The indirectly heated rotary kiln for drying lignite according to claim 1 wherein: the combined sealing mechanism arranged between the furnace body (8) and the feeding mechanism adopts a compensator and mechanical seal combination, and the mechanical seal is in a double sealing surface structure of a movable ring and a static ring; the sealing surfaces of the movable ring (33) and the static ring (32) are tightly attached and fixed through a supporting frame, an oil groove (35) is formed in the sealing surface of the static ring (32), and oil injection holes (31) are formed in two sides of the sealing surface of the static ring; the static ring support frame is connected with a cylinder (28) and a compensator (29).
6. The indirectly heated rotary kiln for drying lignite according to claim 1 wherein: one end of the semi-rigid plate (44) is connected with the cone flange (46) through the pressing plate II (45), the other end of the semi-rigid plate is connected with the wear-resistant sealing block (37) through the pressing plate I (40), and the pressing plate I (40) and the pressing plate II (45) are fixed by the sealing block fixing piece (41).
7. The indirectly heated rotary kiln for drying lignite according to claim 1 wherein: the furnace body (8) is obliquely installed, materials enter from the installation high-point end of the furnace body (8), are directly fed into the furnace body (8) through the feeding conveyor (1), and are fed to the installation low-point end of the furnace body (8) along with the rotation of the furnace body (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811115083.3A CN109282642B (en) | 2018-09-25 | 2018-09-25 | Indirect heating rotary furnace for drying lignite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811115083.3A CN109282642B (en) | 2018-09-25 | 2018-09-25 | Indirect heating rotary furnace for drying lignite |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109282642A CN109282642A (en) | 2019-01-29 |
| CN109282642B true CN109282642B (en) | 2024-03-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811115083.3A Active CN109282642B (en) | 2018-09-25 | 2018-09-25 | Indirect heating rotary furnace for drying lignite |
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| CN111765736B (en) * | 2020-09-01 | 2020-11-24 | 潍坊市和成工程机械制造有限公司 | Sealed rotary drying furnace |
| CN112547277B (en) * | 2020-10-26 | 2023-08-01 | 克拉玛依东方国源环保科技有限公司 | Method and device for producing recycled masonry mortar and concrete |
| CN113265507A (en) * | 2021-06-28 | 2021-08-17 | 王恩礼 | Oxygen-free reduction process for iron oxide ore and closed reduction converter thereof |
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| CN202440462U (en) * | 2012-02-10 | 2012-09-19 | 西安三瑞实业有限公司 | Rotary cooling furnace for dry quenching of semi-coke |
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