Drying equipment and process for drying alternative fuel by coupling kiln tail low-temperature waste gas

Abstract

The invention discloses a drying device and process for drying alternative fuel through coupling kiln tail low-temperature waste gas, and relates to the technical field of drying materials through kiln tail waste gas. The drying device comprises a support fixed to the ground, and a driving device is installed on one side of the support and at least comprises a rotating motor and a telescopic device; the feeding assembly is mounted on the bracket and communicates with the telescopic equipment; the shell is fixed in the bracket; and the drying assembly is arranged in the shell, is in sliding connection with the feeding assembly and is connected with the rotating motor through a rotating shaft.

Description

Technical Field

[0001] This invention relates to the field of drying materials using kiln tail exhaust gas, specifically a drying equipment and process that couples low-temperature kiln tail exhaust gas for drying alternative fuels. Background Technology

[0002] Bypass venting ash / fly ash washing projects have become quite popular in the past two years. After washing and solid-liquid separation, these bypass ash / fly ash still need to be further dried and dehydrated before they can be put into the cement kiln for harmless calcination. Biomass has a high moisture content and also needs to be pre-dried before it can be used in the decomposition furnace. The industry practice is to use the medium-temperature exhaust gas in the kiln head workshop for drying, which will reduce the power generation of the kiln head waste heat boiler.

[0003] Existing technologies for drying water-washed filter residue have significant drawbacks: 1. Adhesion and agglomeration: The filter residue is highly viscous and easily softens and adheres to the inner wall of the dryer in the initial stage, forming a stubborn crust that reduces heat transfer efficiency and requires frequent shutdowns for cleaning; 2. Uneven drying: The filter residue has poor fluidity within the dryer, easily leading to an over-dry outer layer and an under-dry inner core, affecting the final fuel quality and combustion stability; 3. Exhaust gas pollution: Direct contact drying easily introduces dust and odorous substances from the filter residue into the exhaust gas, increasing the load on subsequent tail gas treatment; 4. Low thermal efficiency: Static or simple rotary structures cannot fully utilize the heat of low-temperature exhaust gas, resulting in a still relatively high exhaust temperature and insufficient thermal energy utilization.

[0004] To address the above problems, this invention provides a drying equipment and process for using coupled kiln tail low-temperature exhaust gas to dry alternative fuels, thereby solving the aforementioned issues. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides the following technical solution: a drying device that couples kiln tail low-temperature waste gas for drying alternative fuels, characterized in that it comprises:

[0006] A bracket, fixed to the ground, has a drive device installed on one side, the drive device including at least a rotary motor and a telescopic device;

[0007] A feeding assembly is mounted on the bracket and communicates with the telescopic device;

[0008] The housing is fixed inside the bracket;

[0009] The drying component is disposed inside the housing and is slidably connected to the feeding component, and is connected to the rotary motor via a rotating shaft.

[0010] Further, preferably, the feeding assembly includes:

[0011] A sliding ring, which is slidably but non-rotatable, is mounted on the rotating shaft;

[0012] Multiple fasteners are configured and are circumferentially and uniformly fixed to the outer wall of the sliding ring;

[0013] The connector is configured in multiple ways, with one end fixed to each of the multiple fixing members, and the other end of the connector is jointly fixed to a sealing ring, which is slidably connected to the drying assembly.

[0014] The feed hopper is fixed on the bracket.

[0015] At least two dividing plates are vertically fixed inside the feed hopper;

[0016] The opening and closing plate is hinged at one end to the bottom of the feed hopper using a hinge shaft.

[0017] Furthermore, preferably, the top of the opening and closing plate has a guiding surface that is concave inward, and one end of the hinge shaft of the opening and closing plate is higher than the other end, and the bottom of the opening and closing plate is in contact with the outer wall of the sealing ring.

[0018] Further, preferably, the drying assembly includes:

[0019] An air inlet plate and an outlet plate are symmetrically fixed inside the housing. The air inlet plate is close to the feeding assembly. An air inlet is provided on the air inlet plate. An outlet is provided at the bottom of the outlet plate. A control valve is installed on the outlet. An inlet and an outlet are provided in the middle of the outlet plate for the entry and exit of exhaust gas.

[0020] The outer cylinder is rotatably disposed between the air inlet plate and the discharge plate, and an external heating chamber is provided between it and the shell. The external heating chamber is connected to the air inlet.

[0021] The inner cylinder is coaxially fixed inside the outer cylinder;

[0022] The drying chamber is located between the inner cylinder and the outer cylinder.

[0023] Furthermore, preferably, the inner cylinder has an internal heating chamber inside, a spiral plate is fixed inside the internal heating chamber, and multiple fins are uniformly fixed on the outer circumference of the inner cylinder.

[0024] Furthermore, preferably, the drying chamber is configured in sequence as a feeding section, a lifting section, and a discharging section, with the feeding section located close to the feeding assembly.

[0025] Furthermore, preferably, the inner wall of the feeding section is evenly provided with multiple wedge-shaped blocks, the inner circumference of the lifting section is evenly provided with multiple lifting frames, and the inner wall of the discharge section is fixed with a spiral conveyor plate.

[0026] Furthermore, preferably, one end of the wedge block is provided with a cone head, and the upper end face of the cone head is provided with an arc-shaped surface, the arc-shaped surface being concave inward, and the end of the wedge block away from the cone head is provided with a lifting protrusion, and the wedge block is arranged at an angle.

[0027] The lifting frame is inclined, and the inclination angle and direction are the same as those of the wedge block. An opening is provided at one end of the lifting frame near the wedge block, and multiple filter holes are provided on the outer wall of the lifting frame.

[0028] A drying process that couples kiln tail low-temperature exhaust gas for drying alternative fuel includes the following steps:

[0029] S1: The alternative fuel is conveyed to the crusher by conveyor one. After being crushed, the material is conveyed to the metering equipment by conveyor two. The metered material is sent to the drying device for drying. The alternative fuel that meets the discharge moisture requirements enters the crusher two for further crushing. Then, the material is sent to the finished product silo by conveyor three, and the finished product is then conveyed to the decomposition furnace by the pneumatic conveying device.

[0030] S2: During the drying device, crusher 2, and finished product silo conveying process of the alternative fuel in step S1, some dust will be generated. The dust from these three places will be collected by the dust collection fan and sent to the cyclone collector. The cyclone collector will separate the dust from the exhaust gas. The exhaust gas will be drawn to the chimney by the dust collection fan and discharged. The dust will be transferred to the tail of the conveyor 3 through the bottom of the cyclone collector.

[0031] S3: The 90-150℃ exhaust gas from the kiln tail heating components is extracted by the low-temperature induced draft fan II. After being dehumidified by the dehumidifier, it is sent to the drying device to participate in the drying of the alternative fuel. If there is excess flue gas at the kiln tail, the 200-220℃ exhaust gas from the outlet of the high-temperature fan can be extracted and combined with the exhaust gas extracted by the low-temperature induced draft fan II before being sent to the drying device to dry the alternative fuel.

[0032] Compared with the prior art, the present invention provides a drying equipment and process for coupling low-temperature exhaust gas from the kiln tail to dry alternative fuels, which has the following beneficial effects:

[0033] 1. High-efficiency composite heating significantly improves heat utilization:

[0034] The structure of the external heating chamber and the internal heating chamber enables jacketed bidirectional heating of the drying chamber. Low-temperature exhaust gas can exchange heat simultaneously from the inside of the material layer (through the inner cylinder wall and fins) and the outside (through the outer cylinder wall), which greatly increases the heat exchange area and makes full use of the low-temperature exhaust heat. The system's thermal efficiency is significantly improved compared to traditional single-mode dryers.

[0035] 2. Solve the problems of wall sticking and uneven drying:

[0036] Feed section wedge block: Its cone head is conducive to cutting into highly wet and sticky materials, and the inwardly concave arc surface can effectively receive and initially guide the material. The inclined arrangement can generate continuous shearing and peeling action, preventing the material from clumping and sticking to the wall at the most easily adhered stage from the root.

[0037] Lifting section lifting frame: The inclined opening ensures that the material enters smoothly, and the numerous filter holes create extremely high air permeability when lifting the material, allowing hot air to fully penetrate the material curtain, enhancing convective heat transfer, and ensuring that the material is heated evenly during the core drying period in the middle section.

[0038] The screw conveyor plate in the discharge section is responsible for quickly pushing the dried loose material to the discharge port, avoiding excessive retention or back mixing in the drum, and ensuring smooth discharge and consistent moisture content.

[0039] 3. Dynamic sealed feeding ensures continuous and stable system operation:

[0040] The feeding assembly, through the structure of a sliding ring and a sealing ring, achieves a dynamic sealing connection between the rotating drying assembly and the fixed feeding hopper, ensuring that high-moisture materials can be continuously fed into the drying hopper, while effectively preventing hot air leakage from the feed inlet, maintaining stable negative pressure in the system, and reducing heat loss and dust overflow. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the drying component structure of a drying device that couples low-temperature exhaust gas from the kiln tail for drying alternative fuels.

[0042] Figure 2 This is a schematic diagram of the feeding component structure of a drying device that couples low-temperature exhaust gas from the kiln tail for drying alternative fuels.

[0043] Figure 3 This is a schematic diagram of the internal structure of a drying component in a drying device that couples low-temperature exhaust gas from the kiln tail for drying alternative fuels.

[0044] Figure 4 This is a schematic diagram of the inner cylinder structure of a drying device that couples low-temperature exhaust gas from the kiln tail for drying alternative fuels.

[0045] Figure 5 This is a schematic diagram of the outer cylinder structure of a drying device that couples low-temperature exhaust gas from the kiln tail for drying alternative fuels.

[0046] Figure 6 This is a schematic diagram of the material lifting component structure of a drying device that couples low-temperature exhaust gas from the kiln tail for drying alternative fuels.

[0047] Figure 7 This is a process flow diagram of a drying equipment that couples low-temperature exhaust gas from the kiln tail for drying alternative fuels.

[0048] In the diagram: 1. Support frame; 2. Drive unit; 3. Feeding assembly; 4. Housing; 5. Drying assembly; 31. Sliding ring; 32. Fixing component; 33. Connecting component; 34. Sealing ring; 35. Feeding bin; 36. Dividing plate; 37. Opening and closing plate; 38. Hinge shaft; 39. Guide surface; 41. External heating chamber; 51. Air inlet plate; 52. Discharge plate; 53. Outer cylinder; 54. Air inlet; 55. Inner cylinder; 551. Fin; 552. Internal heating chamber; 553. Spiral plate; 56. Drying chamber; 57. Feeding section; 58. Lifting section; 59. Discharge section; 571. Conical head; 572. Arc-shaped surface; 573. Raised surface; 581. Lifting frame; 582. Filter hole; 583. Opening; 10. Conveyor 1; 20. Crusher 1; 30. Conveyor 2; 40. Metering equipment; 50. Drying device; 60. Crusher 2; 70. Conveyor 3; 80. Finished product silo; 90. Pneumatic conveying equipment; 100. Cyclone collector; 200. Dust collection fan; 300. Chimney; 400. Kiln tail heating assembly; 401. High temperature fan; 402. Kiln tail bag dust collector; 403. Low temperature induced draft fan 1; 404. Raw material mill; 405. Circulating fan; 406. Low temperature induced draft fan 2; 407. Dehumidifier. Detailed Implementation

[0049] Reference Figures 1-7 This invention provides a technical solution: a drying device that couples low-temperature waste gas from the kiln tail for drying alternative fuels, comprising:

[0050] A bracket 1 is fixed to the ground, and a drive device 2 is installed on one side of it. The drive device 2 includes at least a rotary motor and a telescopic device.

[0051] The feeding assembly 3 is mounted on the bracket 1 and is connected to the telescopic device;

[0052] The housing 4 is fixed inside the bracket 1;

[0053] The drying component 5 is disposed inside the housing 4 and is slidably connected to the feeding component 3, and is connected to the rotary motor via a rotating shaft.

[0054] In this embodiment, the feeding assembly 3 includes:

[0055] A sliding ring 31 is slidably but non-rotatably mounted on the rotating shaft;

[0056] Multiple fasteners 32 are configured and are circumferentially and uniformly fixed to the outer wall of the sliding ring 31;

[0057] Multiple connectors 33 are configured, with one end fixed to one of the multiple fixing members 32 respectively, and the other end being fixed to a sealing ring 34. The sealing ring 34 is slidably connected to the drying assembly 5.

[0058] The feed hopper 35 is fixed on the bracket 1;

[0059] At least two dividing plates 36 are vertically fixed inside the feed hopper 35;

[0060] The opening and closing plate 37 is hinged at one end to the bottom of the feed hopper 35 by a hinge shaft 38.

[0061] In a preferred embodiment, the top of the opening and closing plate 37 has a guide surface 39, which is concave inward, and one end of the hinge shaft 38 of the opening and closing plate 37 is higher than the other end, and the bottom of the opening and closing plate 37 is in contact with the outer wall of the sealing ring 34.

[0062] It should be noted that an arc-shaped protrusion can be provided on the outer wall of the sealing ring 34, so that when the sealing ring 34 rotates, it can generate continuous vibration on the opening and closing plate 37, thereby facilitating the falling of wet and sticky materials.

[0063] In other words, when the sealing ring 34 slides away from the drying component 5, the opening and closing plate 37 is tilted and deflected due to its inclined arrangement, allowing the material to enter the drying component 5. Afterward, the sealing ring 34 resets, pushing the opening and closing plate 37 to reset, thereby closing the feeding hopper 35 and completing the feeding operation. Moreover, when the material enters the feeding hopper 35, the dividing plate 36 can perform preliminary cutting of the material, thereby avoiding large pieces of material that could affect the drying effect.

[0064] It should be noted that the bottom thickness of the sealing ring 34 is greater than the top thickness. That is, when the sealing ring 34 slides open, the bottom of the sealing ring 34 is in contact with the drying component 5, while the top is not in contact with the drying component 5, to prevent the material from flowing out from the bottom when it falls.

[0065] In this embodiment, the drying component 5 includes:

[0066] The air inlet plate 51 and the discharge plate 52 are symmetrically fixed inside the housing 4. The air inlet plate 51 is close to the feeding assembly 3. The air inlet plate 51 has an air inlet 54. The bottom of the discharge plate 52 has a discharge outlet. A control valve is installed on the discharge outlet. The middle position of the discharge plate 52 has an inlet and an outlet for the entry and exit of exhaust gas.

[0067] The outer cylinder 53 is rotatably disposed between the air inlet plate 51 and the discharge plate 52, and an external heating chamber 41 is disposed between it and the housing 4. The external heating chamber 41 is connected to the air inlet 54.

[0068] The inner cylinder 55 is coaxially fixed inside the outer cylinder 53;

[0069] The drying chamber 56 is located between the inner cylinder 55 and the outer cylinder 53.

[0070] It should be noted that the discharge plate 52 and the external heating chamber 41 are also provided with air vents, so as to facilitate the discharge of waste gas in the external heating chamber 41.

[0071] Preferably, an inner heating chamber 552 is provided inside the inner cylinder 55, a spiral plate 553 is fixed inside the inner heating chamber 552, and a plurality of fins 551 are uniformly fixed on the outer circumference of the inner cylinder 55.

[0072] In other words, the structure of the outer heating chamber 41 and the inner heating chamber 552 enables jacketed bidirectional heating of the drying chamber 56. Low-temperature waste gas can simultaneously exchange heat from the inside of the material layer (through the inner cylinder 55 wall and fins 551) and the outside (through the outer cylinder 53 wall), greatly increasing the heat exchange area and making full use of the low-temperature waste heat.

[0073] In addition, the spiral plate 553 inside the inner cylinder 55 can increase the flow path of the exhaust gas, thereby further improving the heat exchange rate.

[0074] Preferably, the drying chamber 56 is configured in sequence as a feeding section 57, a lifting section 58 and a discharging section 59, with the feeding section 57 located close to the feeding assembly 3.

[0075] In a preferred embodiment, the inner wall of the feeding section 57 is evenly provided with a plurality of wedge-shaped blocks, the inner circumference of the lifting section 58 is evenly provided with a plurality of lifting frames 581, and the inner wall of the discharge section 59 is fixed with a spiral conveyor plate.

[0076] In addition, a cone head 571 is provided at one end of the wedge block, and an arc-shaped surface 572 is provided on its upper end face. The arc-shaped surface 572 is concave inward. A lifting protrusion 573 is provided at the end of the wedge block away from the cone head 571, and the wedge block is arranged at an angle.

[0077] The lifting frame 581 is inclined, and the inclination angle and direction are the same as those of the wedge block. The lifting frame 581 has an opening 583 at one end near the wedge block, and the outer wall of the lifting frame 581 has multiple filter holes 582.

[0078] In other words, the wedge-shaped block of the feeding section 57 has a cone head 571 that is conducive to cutting into highly wet and sticky materials, and an inwardly concave arc surface 572 that can effectively receive and initially guide the materials. The inclined arrangement can generate continuous shearing and peeling action, preventing the materials from clumping and sticking to the wall at the stage where they are most likely to adhere.

[0079] The lifting frame 581 of the lifting section 58 is inclined and has an opening 583 to ensure that the material enters smoothly. The numerous filter holes 582 create extremely high air permeability when lifting the material, allowing hot air to fully penetrate the material curtain, enhancing convective heat transfer, and ensuring that the material is heated evenly in the core drying period of the middle section.

[0080] The spiral conveyor plate of the discharge section 59 is responsible for quickly pushing the dried loose material to the discharge port, avoiding excessive residence or back mixing in the cylinder, ensuring smooth discharge and consistent moisture content, and the reverse rotation can cause the material to flow back, so as to circulate and dry when the discharge moisture content does not meet the requirements.

[0081] A drying process that couples kiln tail low-temperature exhaust gas for drying alternative fuel includes the following steps:

[0082] S1: The alternative fuel is conveyed to the crusher 20 by conveyor 10. After crushing, the material is conveyed to the metering device 40 by conveyor 2 30. The metered material is sent to the drying device 50 for drying. The alternative fuel that meets the discharge moisture requirements enters the crusher 2 60 for further crushing. Then, the material is sent to the finished product bin 80 by conveyor 3 70, and then the finished product is sent to the decomposition furnace by pneumatic conveying device 90.

[0083] S2: During the conveying and processing of alternative fuel in the drying device 50, crusher 2 60 and finished product silo 80 in step S1, some dust will be generated. The dust from these three locations will be collected by the dust collection fan 200 to the cyclone collector 100. The cyclone collector 100 will separate the dust from the exhaust gas. The exhaust gas will be drawn by the dust collection fan 200 to the chimney 300 for discharge. The dust will be transferred to the tail of the conveyor 3 70 through the bottom of the cyclone collector 100.

[0084] S3: The 90-150℃ exhaust gas from the kiln tail heating component 400 is extracted by the low-temperature induced draft fan 406. After being dehumidified by the dehumidifier 407, it is sent to the drying device 50 to participate in the drying of the alternative fuel. If there is excess flue gas at the kiln tail, the 200-220℃ exhaust gas from the outlet of the high-temperature fan 401 can be extracted and combined with the exhaust gas extracted by the low-temperature induced draft fan 406 before being sent to the drying device 50 to dry the alternative fuel.

[0085] It should be noted that the kiln tail heating component 400 includes a high-temperature fan 401, a kiln tail bag dust collector 402, a low-temperature induced draft fan 1 403, a raw material mill 404, a circulating fan 405, a low-temperature induced draft fan 2 406, and a dehumidifier 407.

[0086] The connection relationships are as follows: the head of conveyor 10 is connected to the inlet of crusher 20, the outlet of crusher 20 is connected to the tail of conveyor 30, the head of conveyor 30 is connected to the inlet of metering device 40, the outlet of metering device 40 is connected to the inlet of drying device 50, the outlet of drying device 50 is connected to the inlet of crusher 60, the outlet of crusher 60 is connected to the tail of conveyor 70, the head of conveyor 70 is connected to the inlet of finished product bin 80, the outlet of finished product bin 80 is connected to pneumatic conveying device 90, and the pneumatic conveying device 90 delivers the processed alternative fuel to the decomposition furnace.

[0087] The inlet of cyclone collector 100 is connected to the dryer 50, the inlet of crusher 2 60, and the top of finished product silo 80. The dust collector fan 200 is connected to the outlet of cyclone collector 100. The discharge port of cyclone dust collector 100 is connected to the tail of conveyor 3 70. The dust collector fan 200 is connected to chimney 300 to discharge the flue gas into the atmosphere.

[0088] The high-temperature fan 401 has a three-way exhaust duct. One way is connected to the inlet of the kiln tail bag dust collector 402 via a bypass duct. Another way is connected to the circulating fan 405 via the raw material mill 404. The circulating fan 405 is connected to the kiln tail bag dust collector 402. The last way is connected to the low-temperature induced draft fan 403. An air intake point is set on the exhaust duct of the kiln tail bag dust collector 402 and connected to the low-temperature induced draft fan 406. The outlet of the low-temperature induced draft fan 406 is connected to the inlet of the dehumidifier 407. The exhaust ducts of the low-temperature induced draft fan 403 and the dehumidifier 407 merge and are then connected to the drying device 50.

[0089] It should be noted that the drying device 50 includes multiple drying components 5 and related parts, thereby enabling multi-line drying operations and improving drying efficiency.

[0090] Preferably, a monitoring device can be installed at the discharge port on the discharge plate 52 of the drying component 5 to monitor the material moisture content. The discharge port is a control valve that opens when the material moisture content meets the standard and closes when the material moisture content does not meet the standard. At this time, the rotary motor rotates in the reverse direction, so that the spiral conveyor plate of the discharge section 59 can reverse the flow of the material, thereby performing cyclic drying when the discharge moisture content does not meet the requirements.

[0091] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A drying device that couples kiln tail low-temperature waste gas for drying alternative fuel, characterized in that, include: A bracket (1) is fixed on the ground, and a drive device (2) is installed on one side of it. The drive device (2) includes at least a rotary motor and a telescopic device. The feeding assembly (3) is mounted on the bracket (1) and is connected to the telescopic device; The housing (4) is fixed inside the bracket (1); The drying component (5) is disposed inside the housing (4), is slidably connected to the feeding component (3), and is connected to the rotary motor by a rotating shaft.

2. The drying equipment for drying alternative fuel using coupled kiln tail low-temperature waste gas according to claim 1, characterized in that, The feeding assembly (3) includes: A sliding ring (31) is slidably and non-rotatably mounted on the shaft; The fasteners (32) are configured in multiple ways and are circumferentially fixed to the outer wall of the sliding ring (31); The connector (33) is configured in multiple ways, with one end fixed to one of the multiple fixing members (32) respectively, and the other end together fixed to a sealing ring (34), which is slidably connected to the drying assembly (5); The feed hopper (35) is fixed on the bracket (1); At least two dividing plates (36) are vertically fixed inside the feed hopper (35); The opening and closing plate (37) is hinged at one end to the bottom of the feed hopper (35) by a hinge shaft (38).

3. The drying equipment for drying alternative fuel using coupled kiln tail low-temperature waste gas according to claim 2, characterized in that, The top of the opening and closing plate (37) has a guide surface (39), which is concave inward, and one end of the hinge shaft (38) of the opening and closing plate (37) is higher than the other end. The bottom of the opening and closing plate (37) is in contact with the outer wall of the sealing ring (34).

4. The drying equipment for drying alternative fuel using coupled kiln tail low-temperature waste gas according to claim 1, characterized in that, The drying assembly (5) includes: An air inlet plate (51) and an outlet plate (52) are symmetrically fixed inside the housing (4), and the air inlet plate (51) is close to the feeding assembly (3). An air inlet (54) is provided on the air inlet plate (51), and an outlet is provided at the bottom of the outlet plate (52). A control valve is installed on the outlet, and an inlet and an outlet are provided in the middle of the outlet plate (52) for the entry and exit of exhaust gas. The outer cylinder (53) is rotatably disposed between the air inlet plate (51) and the discharge plate (52), and an external heating chamber (41) is disposed between it and the shell (4). The external heating chamber (41) is connected to the air inlet (54). The inner cylinder (55) is coaxially fixed inside the outer cylinder (53); The drying chamber (56) is located between the inner cylinder (55) and the outer cylinder (53).

5. A drying device for drying alternative fuel using coupled kiln tail low-temperature waste gas according to claim 4, characterized in that, The inner cylinder (55) has an internal heating chamber (552) inside, and a spiral plate (553) is fixed inside the internal heating chamber (552). Multiple fins (551) are evenly fixed on the outer circumference of the inner cylinder (55).

6. A drying device for drying alternative fuel using coupled kiln tail low-temperature waste gas according to claim 4, characterized in that, The drying chamber (56) is configured in sequence as a feeding section (57), a lifting section (58) and a discharging section (59), with the feeding section (57) located close to the feeding assembly (3).

7. A drying device for drying alternative fuel using coupled kiln tail low-temperature waste gas according to claim 6, characterized in that, The inner wall of the feeding section (57) is evenly provided with multiple wedge-shaped blocks, the inner circumference of the lifting section (58) is evenly provided with multiple lifting frames (581), and the inner wall of the discharge section (59) is fixed with a spiral conveyor plate.

8. A drying device for drying alternative fuel using coupled kiln tail low-temperature waste gas according to claim 7, characterized in that, One end of the wedge block is provided with a cone head (571), and an arc surface (572) is provided on its upper end face. The arc surface (572) is concave inward. The end of the wedge block away from the cone head (571) is provided with a lifting protrusion (573), and the wedge block is arranged at an angle. The lifting frame (581) is inclined and the inclination angle and direction are the same as those of the wedge block. The lifting frame (581) has an opening (583) at one end near the wedge block, and the outer wall of the lifting frame (581) has multiple filter holes (582).

9. A drying process for using coupled kiln tail low-temperature waste gas to dry alternative fuel, comprising the drying equipment described in any one of claims 1-8 for using coupled kiln tail low-temperature waste gas to dry alternative fuel, characterized in that, Includes the following steps: S1: The alternative fuel is conveyed to the crusher (20) via conveyor one (10). After being crushed, the material is conveyed to the metering device (40) by conveyor two (30). The metered material is sent to the drying device (50) for drying. The alternative fuel that meets the discharge moisture requirements enters the crusher two (60) for further crushing. The material is then sent to the finished product warehouse (80) by conveyor three (70). The finished product is then sent to the decomposition furnace by the pneumatic conveying device (90). S2: During the conveying and processing of alternative fuel in the drying device (50), crusher two (60), and finished product warehouse (80) in step S1, some dust will be generated. The dust from these three places will be collected by the dust collection fan (200) to the cyclone collector (100). The cyclone collector (100) will separate the dust from the exhaust gas. The exhaust gas will be drawn by the dust collection fan (200) to the chimney (300) for discharge. The dust will be transferred to the tail of the conveyor three (70) through the bottom of the cyclone collector (100). S3: The 90-150°C exhaust gas from the kiln tail heating component (400) is extracted by the low-temperature induced draft fan (406), dehumidified by the dehumidifier (407), and then sent to the drying device (50) to participate in the drying of the alternative fuel. If there is excess flue gas at the kiln tail, the 200-220°C exhaust gas from the outlet of the high-temperature fan (401) can be extracted and combined with the exhaust gas extracted by the low-temperature induced draft fan (406) and then sent to the drying device (50) to dry the alternative fuel.

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