Special coal feeding screw conveyor for gasification furnace

Abstract

The utility model relates to the technical field of conveying, especially a coal screw conveyor special for gasification furnace, which comprises a screw machine rack, a screw machine shell body fixedly connected to the screw machine rack, a driving device fixedly connected to the upper end of the screw machine rack, a solid screw connected to the driving device through a cross slider coupling, the solid screw being arranged in the screw machine shell body, a driving end sealing seat arranged at one end of the solid screw, a tail end sealing seat arranged at the other end of the solid screw, the driving end sealing seat being connected to the screw machine shell body through a flange, the tail end bearing assembly being rotatably connected to the screw machine rack at the tail end of the solid screw, a feeding opening, a discharging opening and an overhaul opening being arranged on the screw machine shell body, and a coal spreading air port being arranged on the overhaul opening. The utility model ensures uniform spreading of the pulverized coal into the gasification furnace, avoids local accumulation of the pulverized coal and coking in the furnace, and thus enables full combustion of the pulverized coal.

Description

Technical Field

[0001] This utility model relates to the field of conveying technology, and in particular to a special coal feeding screw conveyor for gasifiers. Background Technology

[0002] A gasifier is a device that converts solid fuels (such as coal and biomass) into gaseous fuels. Its working principle is mainly based on thermochemical reactions, in which solid fuels and gasifying agents (such as oxygen and steam) undergo a series of chemical reactions under specific furnace conditions to convert into syngas containing combustible gases such as CO, H2, and CH4, and non-combustible gases such as CO2 and N2.

[0003] The feeding device is a crucial component of the gasifier, responsible for delivering solid fuel into the furnace body. Due to the specific structural and technological requirements of the gasifier, the feeding device must continuously and uniformly deliver solid fuel into the furnace. If the feeding is not continuous and uniform, it will lead to problems during operation. Uneven feeding results in uneven material distribution within the gasifier, with some areas having too much material and others too little. In areas with insufficient material, carbon cannot fully react with oxygen and water vapor, leading to a reduced carbon conversion rate. Unreacted carbon will be discharged with the ash and slag, resulting in energy waste. Utility Model Content

[0004] The purpose of this utility model is to solve the shortcomings of discontinuous and uneven feeding in the existing technology, and to propose a special coal feeding screw conveyor for gasifiers.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] Design a special coal feeding screw conveyor for gasifiers, including a screw conveyor frame, a screw conveyor housing fixedly connected to the screw conveyor frame, a drive device fixedly connected to the upper end of the screw conveyor frame, a solid screw connected to the drive device via a cross-slider coupling, the solid screw being disposed inside the screw conveyor housing, a drive end sealing seat installed at one end of the solid screw, a tail end sealing seat installed at the other end of the solid screw, the drive end sealing seat being connected to the screw conveyor housing via a flange, and the end of the solid screw being rotatably connected to the screw conveyor frame via a tail end bearing assembly. The screw conveyor housing is provided with a feed port, a discharge port, and a maintenance port, and a coal feeding duct is provided on the maintenance port.

[0007] Preferably, a drive-end bearing assembly is rotatably connected to the solid spiral, and the drive-end bearing assembly is fixedly connected to the spiral machine frame.

[0008] Preferably, a thermometer is installed on the inspection port, and the thermometer is located on the opposite side of the coal feeding vent.

[0009] Preferably, the screw conveyor housing is provided with an emergency discharge port.

[0010] Preferably, the feeding port is provided with a hand hole, which is located below the adjustment mechanism.

[0011] Preferably, the adjusting mechanism includes two rotating shafts, both of which are rotatably connected to the feeding port via sealed bearings, and both rotating shafts are fixedly connected to a rotating plate. The two rotating shafts are rotated by a rotating mechanism.

[0012] Preferably, the rotating mechanism includes gears, with gears fixedly connected to both rotating shafts and meshing with each other. A telescopic rod is fixedly connected to the outer wall of the feeding port, and a rack is fixedly connected to the upper end of the telescopic rod, with the rack meshing with one of the gears.

[0013] Preferably, the pitch of the helical blades of the solid helix gradually increases from small to large.

[0014] This utility model proposes a special coal feeding screw conveyor for gasifiers, which has the following advantages: the coal feeding duct ensures that pulverized coal is evenly distributed into the gasifier, avoiding local accumulation and coking within the furnace, thus ensuring complete combustion of the pulverized coal. Simultaneously, the coal feeding air acts as a seal and cooler at the coal drop pipe, preventing high-temperature flue gas from the furnace from flowing back into the coal feeder and protecting the screw conveyor from high-temperature damage. The solid screw blades adopt a variable pitch screw, with the screw pitch gradually increasing from the feed end to the discharge end. This variable pitch screw blade provides sufficient space and thrust to ensure smooth material conveying and reduces material adhesion and agglomeration during transport. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a special coal feeding screw conveyor for a gasifier proposed in this utility model;

[0016] Figure 2 This is a schematic diagram of the feeding port of a coal feeding screw conveyor for a gasifier according to the present invention.

[0017] Figure 3 This is a perspective view of the feeding port portion of a coal feeding screw conveyor for a gasifier according to the present invention.

[0018] Figure 4 This utility model proposes a special coal feeding screw conveyor for gasifiers. Figure 3 Enlarged view of section A in the middle.

[0019] In the diagram: 1. Drive unit; 2. Cross-slider coupling; 3. Drive end bearing assembly; 4. Drive end sealing seat; 5. Feed port; 6. Solid auger; 7. Screw excavator housing; 8. Coal feeding vent; 9. Inspection port; 10. Tail end sealing seat; 11. Tail end bearing assembly; 12. Discharge port; 13. Thermometer; 14. Emergency discharge port; 15. Hand hole; 16. Screw excavator frame; 17. Telescopic rod; 18. Rotating plate; 19. Gear; 20. Rotating shaft; 21. Rack. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] Example 1: Refer to Figure 1-3 A special coal feeding screw conveyor for a gasifier includes a screw conveyor frame 16, a screw conveyor housing 7 fixedly connected to the screw conveyor frame 16, and a drive device 1 fixedly connected to the upper end of the screw conveyor frame 16. The drive device 1 consists of a motor and a reducer. The motor is a gas explosion-proof motor. A solid screw 6 is connected to the drive device 1 through a cross-slider coupling 2. The solid screw 6 is set inside the screw conveyor housing 7. A drive end sealing seat 4 is installed at one end of the solid screw 6, and a tail end sealing seat 10 is installed at the other end of the solid screw 6. The drive end sealing seat 4 is connected to the screw conveyor housing 7 through a flange. The end of the solid screw 6 is rotatably connected to the screw conveyor frame 16 through a tail end bearing assembly 11. The screw conveyor housing 7 is provided with a feed port 5, a discharge port 12, and a maintenance port 9. A coal feeding vent 8 is provided on the maintenance port 9 to ensure that the coal powder is evenly distributed into the gasifier, avoiding local accumulation of coal powder and coking in the furnace, thereby ensuring complete combustion of the coal powder. At the same time, the coal feeding air plays a sealing and cooling role at the coal drop pipe, preventing the high-temperature flue gas in the furnace from backflowing into the coal feeder and protecting the screw conveyor from high-temperature damage.

[0022] The pitch of the spiral blades of the solid spiral 6 gradually increases from small to large. The variable pitch spiral blades can provide sufficient space and thrust to ensure smooth material conveying by the spiral conveyor, while reducing material adhesion and agglomeration during the conveying process.

[0023] A drive-end bearing assembly 3 is rotatably connected to the solid spiral 6. The drive-end bearing assembly 3 is fixedly connected to the spiral machine frame 16. The connection between the solid spiral 6 and the spiral machine housing 7 at both ends is sealed by an inflatable packing box seal. When the spiral machine is running, compressed nitrogen is injected into the drive-end sealing seat and the tail-end sealing seat through a high-pressure gas pipe. The nitrogen forms an inert positive pressure protective layer in the sealing seat, which can prevent the combustible gas in the gasifier from leaking into the air during the operation of the spiral machine.

[0024] A thermometer 13 is installed on the inspection port 9. The thermometer 13 is located on the opposite side of the coal feeding vent 8 and is used to monitor the temperature of the coal falling pipe of the screw conveyor.

[0025] The screw conveyor housing 7 is equipped with an emergency discharge port 14 and an inspection port 9. When material blockage occurs in the screw conveyor, the emergency discharge port 14 can promptly clear the blocked material.

[0026] Example 2: Refer to Figure 1 As another preferred embodiment of this utility model, based on embodiment 1, a hand hole 15 is provided on the feeding port 5. The hand hole 15 is located below the adjustment mechanism. When the feeding port 5 is blocked, the feeding blockage can be cleared through the hand hole 15.

[0027] Example 3: Reference Figure 1-4 In another preferred embodiment of this utility model, based on embodiment 2, the adjustment mechanism includes two rotating shafts 20. Both rotating shafts 20 are rotatably connected to the feeding port 5 through sealed bearings. A rotating plate 18 is fixedly connected to each of the two rotating shafts 20. The two rotating shafts 20 are rotated by a rotating mechanism. The two rotating shafts 20 are driven to rotate by a driving mechanism. The angle of the rotating plate 18 is adjusted, thereby adjusting the size of the feeding port 5 to change the feed amount and realize the adjustment of the conveying amount.

[0028] The rotating mechanism includes gears 19, and gears 19 are fixedly connected to two rotating shafts 20. The two gears 19 mesh with each other. A telescopic rod 17 is fixedly connected to the outer wall of the feeding port 5. A rack 21 is fixedly connected to the upper end of the telescopic rod 17. The rack 21 meshes with one of the gears 19. The telescopic rod 17 is used to extend and retract to drive the rack 21 to move, thereby rotating the two gears 19.

[0029] When the size of the feeding port 5 is adjusted, the telescopic rod 17 extends and retracts, causing the rack 21 to move. The rack 21 drives one of the gears 19 to rotate, which in turn drives the other gear 19 to rotate, thereby driving the two rotating shafts 20 to rotate. The two rotating shafts 20 drive the rotating plate 18 to rotate, thus adjusting the size of the feeding port 5.

[0030] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A special coal feeding screw conveyor for a gasifier, comprising a screw conveyor frame (16), characterized in that, The screw conveyor frame (16) is fixedly connected to the screw conveyor housing (7). The upper end of the screw conveyor frame (16) is fixedly connected to the drive device (1). The drive device (1) is connected to the solid screw (6) through the cross slider coupling (2). The solid screw (6) is set inside the screw conveyor housing (7). One end of the solid screw (6) is equipped with a drive end sealing seat (4). The other end of the solid screw (6) is equipped with a tail end sealing seat (10). The drive end sealing seat (4) is connected to the screw conveyor housing (7) through a flange. The end of the solid screw (6) is rotatably connected to the screw conveyor frame (16) through a tail end bearing assembly (11). The screw conveyor housing (7) is provided with a feeding port (5), a discharge port (12) and a maintenance port (9). The maintenance port (9) is provided with a coal feeding vent (8).

2. The gasifier-specific coal feeding screw conveyor according to claim 1, characterized in that, The solid spiral (6) is rotatably connected to a drive end bearing assembly (3), which is fixedly connected to the spiral machine frame (16).

3. The gasifier-specific coal feeding screw conveyor according to claim 1, characterized in that, A thermometer (13) is installed on the inspection port (9), and the thermometer (13) is located on the opposite side of the coal-spreading air vent (8).

4. The gasifier-specific coal feeding screw conveyor according to claim 1, characterized in that, An emergency discharge port (14) is provided on the screw conveyor housing (7).

5. A special coal feeding screw conveyor for a gasifier according to claim 1, characterized in that, The feeding port (5) is provided with a hand hole (15), which is located below the adjustment mechanism.

6. A special coal feeding screw conveyor for a gasifier according to claim 5, characterized in that, The adjustment mechanism includes two rotating shafts (20), both of which are rotatably connected to the feeding port (5) through sealed bearings. A rotating plate (18) is fixedly connected to each of the two rotating shafts (20), and the two rotating shafts (20) are rotated by a rotating mechanism.

7. A special coal feeding screw conveyor for a gasifier according to claim 6, characterized in that, The rotating mechanism includes gears (19), and gears (19) are fixedly connected to both of the two rotating shafts (20). The two gears (19) mesh with each other. A telescopic rod (17) is fixedly connected to the outer wall of the feeding port (5). A rack (21) is fixedly connected to the upper end of the telescopic rod (17). The rack (21) meshes with one of the gears (19).

8. A special coal feeding screw conveyor for a gasifier according to claim 1, characterized in that, The pitch of the spiral blades of the solid spiral (6) gradually increases from small to large.

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