CN213568081U - Spiral coal feeder for fluidized bed gasification furnace - Google Patents

Abstract

The utility model discloses a spiral feeder for fluidized bed gasification stove belongs to gasifier feeder field. The problem to the complicated and easy jam of ejection of compact of current gasifier feeder structure, the utility model provides a spiral feeder for fluidized bed gasifier, it includes spiral shell, and spiral shell's one end is provided with the feed inlet, and the other end is provided with the discharge gate, is provided with the main shaft in the spiral shell, is provided with helical blade on the main shaft, and the main shaft is connected with drive arrangement, still includes the clear stifled device of material, and the clear top that blocks up the device setting at the discharge gate of material, the clear stifled device of material and spiral shell intercommunication. The utility model discloses a set up the clear stifled device of material in the top of discharge gate, thereby avoid taking place the material bonding in the spiral shell and influence the ejection of compact effect, guarantee that the ejection of compact is more unobstructed in the spiral shell, improve feed efficiency; the whole device is simple in structure, easy to install and maintain and low in overall cost.

Description

Spiral coal feeder for fluidized bed gasification furnace

Technical Field

The utility model belongs to gasifier feeder equipment field, more specifically say, relate to a spiral feeder for fluidized bed gasifier.

Background

The spiral coal feeder is a core device in the production of the fluidized bed gasification system, bears the important task of providing raw materials for the fluidized bed gasification furnace, and is directly related to whether the whole coal gasification system can safely and stably operate or not. Traditional spiral feeder structure is complicated, complex operation, has certain safe risk simultaneously.

Corresponding improvement is also carried out aiming at the problems, for example, Chinese patent application No. CN201921360545.8, the publication date is 24/4/2020, the patent discloses a coal feeding device of a circulating fluidized bed gasification furnace, and belongs to the technical field of coal gasification. It includes spiral feeder, gas-supply pipe, trip valve, safe trachea and coal breakage pipe, the gas outlet of gas-supply pipe is aimed at the import of coal breakage pipe, coal breakage pipe bypass connects safe trachea, and installs the trip valve on it, safe trachea connect in the trip valve with between the export of coal breakage pipe. The disadvantages of the patent are that: in actual operation, materials are easy to harden at a discharge hole to block a coal feeder, and meanwhile, the coal feeding is easy to be unsmooth, so that the temperature in the furnace is over-high, the system operation is forced to be stopped, and the safety and the stability of the system and equipment cannot be guaranteed.

Also like chinese patent application No. CN201720621210.1, published as 2018, 2, 9, the patent discloses a coal feeding system, belonging to the field of fluidized bed gasification furnaces. The coal feeding device comprises a buffering coal hopper, a spiral coal feeder, a coal feeding pipe and a hearth which are sequentially connected, wherein the buffering coal hopper is perpendicular to the spiral coal feeder, and the spiral coal feeder and the coal feeding pipe are horizontally and coaxially arranged. The disadvantages of the patent are that: the spiral main shaft is deformed at high temperature, so that the possibility of friction between the spiral blade and the spiral shell exists, high-temperature combustible coal gas can be caused to flow out of the coal feeder, coal in the spiral is coked slightly, the coal feeder is blocked, the overcurrent of a motor of the coal feeder is stopped, and the dangerous conditions such as coal gas poisoning of surrounding personnel, fire and the like can be caused seriously. The coal feeder is higher in cost, and meanwhile, the safety and the stability of equipment cannot be guaranteed.

SUMMERY OF THE UTILITY MODEL

1. Problems to be solved

To the problem that current gasifier feeder structure is complicated and the ejection of compact is easy to be blockked up, the utility model provides a spiral feeder for fluidized bed gasifier. The material in the spiral shell is timely evacuated through the material blockage removing device, so that the material adhesion in the spiral shell is avoided to influence the discharging effect, the whole structure is simple, and the discharging is smooth.

2. Technical scheme

In order to solve the above problems, the utility model adopts the following technical proposal.

The utility model provides a spiral feeder for fluidized bed gasification furnace, includes spiral shell, and spiral shell's one end is provided with the feed inlet, and the other end is provided with the discharge gate, is provided with the main shaft in the spiral shell, is provided with helical blade on the main shaft, and the main shaft is connected with drive arrangement, still includes the clear stifled device of material, and the clear stifled device setting of material is in the top of discharge gate, clear stifled device of material and spiral shell intercommunication.

Furthermore, the material blockage removing device comprises a sealed gas main pipe for introducing gas, a sealed gas branch pipe is arranged on the sealed gas main pipe, one end of the sealed gas branch pipe is communicated with the sealed gas main pipe, the other end of the sealed gas branch pipe is communicated with the spiral shell, and the end, communicated with the spiral shell, of the sealed gas branch pipe faces the discharge hole.

Still further, still be provided with the clear stifled pipe on the sealed gas manifold, clear stifled pipe is arranged with sealed gas branch pipe in the same centre of a circle, and the one end of clear stifled pipe is the gaseous access end, and the other end communicates with sealed gas manifold, and the one end orientation discharge gate of clear stifled pipe and sealed gas manifold intercommunication.

Furthermore, a valve is arranged on the blockage removing pipe.

Furthermore, two ends of the main shaft are respectively fixed in the spiral shell through a front bearing chamber and a rear bearing chamber, the front bearing chamber and the rear bearing chamber are both connected with the spiral shell through a flange II, and the front bearing chamber is connected with the driving device through the main shaft.

Furthermore, the front bearing chamber comprises a thrust bearing connected with the main shaft, and the thrust bearing is connected with a flange II through a flange I; the rear bearing chamber comprises a self-aligning roller bearing connected with the main shaft, and the self-aligning roller bearing is connected with a flange II through a flange I.

Furthermore, an end cover is arranged on one side of the flange I, an air inlet groove is formed in the end cover, an annular groove is formed in the position where the end cover is in contact with the main shaft, the annular groove is arranged along the circumferential direction of the main shaft, and the air inlet groove is communicated with the annular groove; a bearing sleeve is arranged on the other side of the flange I, an oil injection port is formed in the bearing sleeve, and the bearing sleeve is sleeved outside the thrust bearing and the self-aligning roller bearing respectively; and a bearing sealing air interface is arranged on the flange I and is communicated with the air inlet groove.

Furthermore, bearing glands are arranged on the thrust bearing and the self-aligning roller bearing.

Furthermore, a hoop is arranged at one end of the main shaft connected with the driving device, and the hoop is connected with the thrust bearing.

Furthermore, helical blade is including setting up the forward helical blade on the main shaft, sets up the reverse helical blade who is close to discharge gate one end at the main shaft, and forward helical blade revolves to the same with material direction of delivery, and reverse helical blade revolves to the opposite with forward helical blade.

3. Advantageous effects

Compared with the prior art, the beneficial effects of the utility model are that:

(1) the utility model discloses a set up the clear stifled device of material in the top of discharge gate, thereby avoid taking place the material bonding in the spiral shell and influence the ejection of compact effect, guarantee that the ejection of compact is more unobstructed in the spiral shell, improve feed efficiency; the whole device has simple structure, easy installation and maintenance and lower overall cost;

(2) the material blockage removing device in the utility model has the advantages that through introducing gas, the gas passes through the spiral shell to loosen and assist in blowing the materials in the spiral shell, and is discharged from the discharge port together with the materials, so that the discharging smoothness is improved, meanwhile, the gas can form pressure at the discharge port, high-temperature coal gas in the fluidized bed gasification furnace can be effectively prevented from flowing backwards into the spiral shell, the problem of coal gas leakage is avoided, and the safety performance of the whole coal feeding process is improved;

(3) the utility model discloses still be provided with clear stifled pipe on clear stifled device, when the moisture content of transported substance material is great, the material easily takes place the bonding phenomenon, through let in fast-speed compressed gas can make the material on spiral shell inner wall and the main shaft rush down and make its smooth ejection of compact in clear stifled intraductal, avoid the material to bond for a long time and lead to the situation that the blanking is unobstructed, further improve the blanking effect; meanwhile, the blockage removing pipe is provided with a valve, so that the operation is convenient;

(4) the main shaft of the utility model is fixed in the spiral shell through the front and the rear bearing chambers, which plays a supporting role for the main shaft, ensures the stability of the main shaft in the working process, simultaneously, the flange I in the front and the rear bearing chambers is connected with the spiral shell through the flange II, the connection is stable and the disassembly and the maintenance are convenient;

(5) the utility model selects the thrust bearing in the front bearing chamber, which can bear the reverse thrust when conveying materials; the self-aligning roller bearing is selected in the rear bearing chamber, so that the coaxiality of two bearings in the front bearing chamber and the rear bearing chamber is ensured while rolling is achieved, and the working stability of the main shaft is improved;

(6) the utility model discloses set up the end cover in one side of flange I, the opposite side sets up the bearing sleeve pipe, set up the air inlet duct on the end cover, be provided with the sealed gas interface of bearing on the flange I simultaneously, this interface and air inlet duct intercommunication, the end cover is provided with the ring channel around main shaft department simultaneously, this ring channel and air inlet duct intercommunication, sealed gas enters into the gas channel through the sealed gas interface of bearing and then enters into the ring channel finally and enters into the spiral shell, prevent that the gas in the spiral shell entrains the buggy and enters into the indoor card dead bearing of bearing, guarantee the stable operation of front and back bearing room;

(7) the utility model discloses still be provided with the clamp on the main shaft, the clamp is connected with thrust bearing, and the clamp plays the thrust effect, prevents that the thrust bearing of thrust pushing that receives on the main shaft from moving on the main shaft, guarantees thrust bearing's firm performance of work; meanwhile, one end of the main shaft, which is close to the discharge port, is provided with a reverse helical blade, the rotating direction of the reverse helical blade is opposite to the material conveying direction, and the reverse helical blade plays a role in extrusion guiding, so that material blockage at the discharge port is avoided, and the discharge efficiency is improved.

Drawings

FIG. 1 is a view of the overall working structure of the present invention;

FIG. 2 is a schematic view of the gas sealing and plugging device;

FIG. 3 is a schematic structural view of the rear bearing housing;

FIG. 4 is a view taken along line A-A of FIG. 3;

fig. 5 is an enlarged view of a portion a in fig. 1.

In the figure: 1. a variable frequency motor; 2. a speed reducer; 3. a coupling; 4. a bearing thrust sleeve; 5. clamping a hoop; 6. a flange I; 7. A bearing sleeve; 8. a bearing seal air interface; 9. an end cap; 10. an oil filling port; 11. a bearing gland; 12. a thrust bearing; 13. A flange II; 14. a feed inlet; 15. a spiral housing; 16. a main shaft; 17. a forward helical blade; 18. a reverse helical blade; 19. sealing the gas main pipe; 20. clearing the blockage pipe; 21. sealing the gas branch pipe; 22. a self-aligning roller bearing; 23. a discharge port; 24. supporting; 25. a frame; 26. a valve; 27. an air inlet groove; 28. an annular groove; 29. sealing and filling; 101. a front bearing chamber; 102. a material blockage clearing device; 103. a rear bearing chamber.

Detailed Description

The invention will be further described with reference to specific embodiments and drawings.

Example 1

Referring to fig. 1 and 2, a screw feeder for a fluidized bed gasification furnace includes a screw housing 15, and the screw housing 15 is fixed to a frame 25 by a support 24 to ensure the stability of the whole apparatus. The spiral shell 15 is cut into required length by using a whole section of seamless steel pipe, and the overall strength is high. Spiral shell 15's one end is provided with feed inlet 14, and feed inlet 14 adopts the steel sheet welding to form, and the certain slope angle is formed along direction of delivery to the junction of steel sheet and spiral shell 15, and such setting increases the area that the material advances spiral shell 15, plays the material whereabouts guide effect simultaneously for the unloading of material in feed inlet 14 department is more unobstructed, and difficult bridge card dies. The other end is provided with discharge gate 23, and in a similar way, discharge gate 23 sets up the lower extreme at spiral shell 15, adopts the steel sheet welding to form equally, and the certain bank angle is formed along direction of delivery to the junction of steel sheet and spiral shell 15 for the material that is close to discharge gate 23 is loose naturally under self gravity, makes things convenient for the unloading. Be provided with main shaft 16 in spiral shell 15, be provided with helical blade on the main shaft 16, it is preferred, in this implementation, helical blade is including setting up forward helical blade 17 on main shaft 16, set up the reverse helical blade 18 that is close to discharge gate 23 one end at main shaft 16, forward helical blade 17 revolves to the same with material direction of delivery, reverse helical blade 18 revolves to reverse with forward helical blade 17, the material is carried the material to the direction of discharge gate 23 through forward helical blade 17's rotation, when carrying discharge gate 23 top, the material passes through reverse helical blade 18's extrusion direction, in addition the effect of material self gravity, fall to in the discharge gate 23. Adopt such blade setting can effectively guarantee that the material enters into discharge gate 23 smoothly, avoid the material to take place to spill the condition of leaking. The main shaft 16 is connected with a driving device, in the embodiment, the driving device comprises a variable frequency motor 1 and a speed reducer 2 connected with the variable frequency motor 1, the main shaft 16 is connected with the speed reducer 2 through a coupler 3, and the whole driving device is simple in structure and stable in power transmission.

The spiral coal feeder for the fluidized bed gasification furnace also comprises a material blockage removing device 102, the material blockage removing device 102 is arranged above the discharge port 23, and the material blockage removing device 102 is communicated with the spiral shell 15; the material blockage removing device 102 is used for removing materials in the spiral shell 15, and preventing the materials from being bonded in the spiral shell 15 or blocked at the discharge port 23 to influence discharge. Specifically, the material blockage removing device 102 comprises a sealing gas main pipe 19 for introducing gas, a sealing gas branch pipe 21 is arranged on the sealing gas main pipe 19, one end of the sealing gas branch pipe 21 is communicated with the sealing gas main pipe 19, the other end of the sealing gas branch pipe 21 is communicated with the spiral shell 15, and the end, communicated with the spiral shell 15, of the sealing gas branch pipe 21 faces the discharge hole 23; the number of the sealing air branch pipes 21 is at least two, the sealing air branch pipes 21 and the spiral shell 15 are arranged in an inclined mode, and in order to avoid mutual interference between the sealing air branch pipes 21 and blades on the main shaft 16, the blades are not arranged on the positions, corresponding to the sealing air branch pipes 21, of the main shaft 16. The sealing gas enters the sealing gas branch pipe 21 from the sealing gas main pipe 19 and downwards passes through the spiral shell 15 and the discharge port 23, and when the gas passes through the spiral shell 15, a gap between the spiral shell 15 and the main shaft 16 passes through the gas, so that internal materials can be loosened and blown, and the gas and the materials are discharged from the discharge port 23; because the sealing gas branch pipe 21 extends into the spiral shell 15 and faces the discharge port 23, gas cannot blow materials around the main shaft 16, so that the situation that the blanking is not smooth and the gas reversely flows to the feed port 14 is caused, and the discharging of the coal feeder is smoother. The gas is compressed air, the pressure of the compressed air is 10-20 Kpa higher than the operating pressure of the hearth, and when the gas amount is more than 500Nm3/h, the gas can form pressure at the discharge port 23, so that the high-temperature gas in the fluidized bed gasification furnace can be effectively prevented from flowing backwards, the problem of gas leakage is avoided, and the safety of equipment is improved.

Furthermore, still be provided with clear stifled pipe 20 on the sealed gas main 19, clear stifled pipe 20 is arranged with sealed gas branch pipe 21 in the same centre of a circle, and the one end of clear stifled pipe 20 is the gas access end, and the other end communicates with sealed gas main 19, and the one end of clear stifled pipe 20 and sealed gas main 19 intercommunication is towards discharge gate 23. Specifically, the sealing gas main pipe 19 is used as a reference, the blockage removing pipe 20 is arranged above the sealing gas main pipe 19, the sealing gas branch pipes 21 are arranged below the sealing gas main pipe 19, the number of the blockage removing pipes 20 corresponds to the number of the sealing gas branch pipes 21 one by one, the blockage removing pipes 20 and the sealing gas branch pipes 21 are arranged concentrically, one end of each blockage removing pipe 20 is communicated with the sealing gas main pipe 19, compressed blockage removing gas is introduced into the other end of each blockage removing pipe, meanwhile, a valve 26 is arranged at the end of each blockage removing pipe to control input and stop of the compressed blockage removing gas conveniently, the compressed blockage removing gas enters the sealing gas branch pipes 21 through the blockage removing pipes 20, the valve 26 is in a closed state when the spiral coal feeder operates normally, and the compressed blockage removing pipes 20 do not convey the compressed blockage removing gas. When the materials conveyed in the spiral shell 15 have high moisture and are easy to bond, the valve 26 on the blockage removing pipe 20 can be opened discontinuously, and the materials on the wall surface of the spiral shell 15 and the main shaft 16 are flushed down by high-speed compressed blockage removing gas, so that the unsmooth coal breakage caused by long-term bonding is prevented. The compressed blockage removing gas adopts compressed nitrogen or compressed air of 0.3-0.8 Mpa.

Example 2

Basically as in embodiment 1, in this embodiment, as shown in fig. 3 and 4, in order to ensure the stable performance of the main shaft 16 during operation, in this embodiment, two ends of the main shaft 16 are respectively fixed in the spiral housing 15 through a front bearing chamber 101 and a rear bearing chamber 103, the front bearing chamber 101 and the rear bearing chamber 103 are both connected with the spiral housing 15 through a flange II13, and the front bearing chamber 101 is connected with the driving device through the main shaft 16. Specifically, the front bearing chamber 101 comprises a thrust bearing 12 connected with the main shaft 16, and the thrust bearing 12 is connected with a flange II13 through a flange I6; the rear bearing chamber 103 comprises a self-aligning roller bearing 22 connected with the main shaft 16, the self-aligning roller bearing 22 is connected with a flange II13 through a flange I6, the arrangement of the bearings in the front bearing chamber and the rear bearing chamber is inconsistent because the thrust bearing 12 in the front bearing chamber 101 can bear the reverse thrust when materials are conveyed, the self-aligning roller bearing 22 in the rear bearing chamber 103 mainly plays a role in rolling, the coaxiality of the two bearings in the front bearing chamber and the rear bearing chamber is ensured, and the working stability of the main shaft 16 is improved. Meanwhile, the hole in the middle of the flange I6 is smaller than the hole in the middle of the flange II13, and the shaft diameter of the main shaft 16 is smaller, so that the hole in the middle of the flange I6 is smaller and matched with the shaft diameter of the main shaft 16, and the flange I6 is conveniently connected with the main shaft 16.

Furthermore, the flange I6 is connected with the flange II13 through a gasket, the connecting surface between the flange I6 and the flange II13 is machined, the size of a matching surface is ensured, the installation coaxiality of the main shaft 16 and the spiral shell 15 is ensured, so that the gap between the outer diameter of the blade on the main shaft 16 and the inner diameter of the spiral shell 15 is smaller, the filling coefficient of materials inside the spiral shell 15 is increased, the working efficiency of feeding the gasification furnace is further improved, meanwhile, the reverse channeling of high-temperature coal gas in the fluidized bed gasification furnace to a coal feeding port can be further prevented, the problem of coal gas leakage is avoided, and the safety of equipment is improved.

Example 3

Basically as in example 2, more specifically, in this embodiment, an end cap 9 is disposed on one side of the flange I6, and the end cap 9 is welded to the flange I6, so as to ensure the stability. An air inlet groove 27 is formed in the end cover 9, an annular groove 28 is formed in the position where the end cover 9 is in contact with the main shaft 16, the annular groove 28 is arranged along the circumferential direction of the main shaft 16, and the air inlet groove 27 is communicated with the annular groove 28. The annular groove 28 is arranged at the position, surrounding the main shaft 16, of the end cover 9, so that gas protection is guaranteed to be arranged in a gap between the main shaft 16 and the end cover 9, coal dust cannot enter the front bearing chamber and the rear bearing chamber, and the service lives of the front bearing chamber and the rear bearing chamber are further guaranteed. A bearing sleeve 7 is arranged on the other side of the flange I6, an oil filling port 10 is arranged on the bearing sleeve 7, and the bearing sleeve 7 is sleeved outside the thrust bearing 12 and the self-aligning roller bearing 22 respectively; the flange I6 is provided with a bearing sealing air interface 8, the bearing sealing air interface 8 is communicated with the air inlet groove 27, the flange I6, the end cover 9 and the bearing sleeve 7 are all made of carbon through machining, the size before installation can guarantee the coaxiality requirement between the flange I6, the end cover 9 and the bearing sleeve, so that the gap between the flange I6 and the main shaft 16 can be smaller than 1mm, and the sealing of the bearing sealing air and the sealing of the sealing filler 29 between the flange I6 and the main shaft 16 on grease are facilitated. When the main shaft 16 works, firstly, lubricating grease is filled in the front bearing chamber and the rear bearing chamber through the oil injection port 10, the valve 26 controlled by bearing sealing gas is opened, the bearing sealing gas enters from the bearing sealing gas interface 8 on the flange I6, passes through the gas inlet groove 27 on the end cover 9 and reaches the annular groove 28 between the end cover 9 and the main shaft 16, and then enters the spiral shell 15, the bearing sealing gas adopted in the implementation is compressed nitrogen or compressed air with the pressure of more than 0.3-0.8 Mpa, and the gas forms a gas barrier in the annular groove 28, so that the gas in the spiral shell 15 is prevented from carrying coal dust to enter the front bearing chamber and the rear bearing chamber, and the bearing is blocked. The long-term stable operation of the equipment is ensured, the gas leakage is further prevented, and the safety of the equipment is improved

Furthermore, the thrust bearing 12 and the self-aligning roller bearing 22 are both provided with bearing glands 11, the bearing glands 11 play a role in sealing the bearings, dust or other interference objects in the external environment are prevented from entering the bearings to influence the work of the bearings, and the service life of the front and rear bearings in the bearing chamber is further prolonged. As shown in fig. 5, a clamp 5 is further arranged at one end of the main shaft 16 connected with the driving device, the clamp 5 is connected with the thrust bearing 12, a bearing thrust sleeve 4 is further arranged at one end of the main shaft 16 connected with the driving device, the bearing thrust sleeve 4 is connected with the clamp 5, the bearing thrust sleeve 4 and the clamp 5 jointly play a thrust role, the main shaft 16 is prevented from being subjected to a reverse thrust, the reverse thrust pushes the bearing to move on the main shaft 16, the stability of the bearing on the main shaft 16 is ensured, and the safety performance of the whole device is further improved.

The examples of the utility model are only right the utility model discloses a preferred embodiment describes, and not right the utility model discloses design and scope are injectd, do not deviate from the utility model discloses under the prerequisite of design idea, the field engineering technical personnel are right the utility model discloses a various deformation and improvement that technical scheme made all should fall into the protection scope of the utility model.

Claims (10)

1. The utility model provides a spiral feeder for fluidized bed gasification stove, includes spiral shell (15), and the one end of spiral shell (15) is provided with feed inlet (14), and the other end is provided with discharge gate (23), is provided with main shaft (16) in spiral shell (15), is provided with helical blade on main shaft (16), and main shaft (16) are connected with drive arrangement, its characterized in that: the material blockage removing device is characterized by further comprising a material blockage removing device (102), wherein the material blockage removing device (102) is arranged above the discharge hole (23), and the material blockage removing device (102) is communicated with the spiral shell (15).

2. The screw feeder for the fluidized bed gasification furnace according to claim 1, wherein: the material blockage removing device (102) comprises a sealing gas main pipe (19) for introducing gas, a sealing gas branch pipe (21) is arranged on the sealing gas main pipe (19), one end of the sealing gas branch pipe (21) is communicated with the sealing gas main pipe (19), the other end of the sealing gas branch pipe is communicated with the spiral shell (15), and the end, communicated with the spiral shell (15), of the sealing gas branch pipe (21) faces the discharge hole (23).

3. The screw feeder for the fluidized bed gasification furnace according to claim 2, wherein: still be provided with on sealed gas main (19) and clear stifled pipe (20), clear stifled pipe (20) is arranged with sealed gas branch pipe (21) in the same centre of a circle, and the one end of clear stifled pipe (20) is the gaseous end of leading to, and the other end and sealed gas main (19) intercommunication, and the one end of clear stifled pipe (20) and sealed gas main (19) intercommunication is towards discharge gate (23).

4. The screw feeder for the fluidized bed gasification furnace according to claim 3, wherein: and a valve (26) is arranged on the blockage removing pipe (20).

5. The screw feeder for the fluidized bed gasification furnace according to claim 1, wherein: two ends of the main shaft (16) are respectively fixed in the spiral shell (15) through a front bearing chamber (101) and a rear bearing chamber (103), the front bearing chamber (101) and the rear bearing chamber (103) are both connected with the spiral shell (15) through a flange II (13), and the front bearing chamber (101) is connected with a driving device through the main shaft (16).

6. The screw feeder for the fluidized bed gasification furnace according to claim 5, wherein: the front bearing chamber (101) comprises a thrust bearing (12) connected with the main shaft (16), and the thrust bearing (12) is connected with a flange II (13) through a flange I (6); the rear bearing chamber (103) comprises a self-aligning roller bearing (22) connected with the main shaft (16), and the self-aligning roller bearing (22) is connected with a flange II (13) through a flange I (6).

7. The screw feeder for the fluidized bed gasification furnace according to claim 6, wherein: an end cover (9) is arranged on one side of the flange I (6), an air inlet groove (27) is formed in the end cover (9), an annular groove (28) is formed in a position where the end cover (9) is in contact with the main shaft (16), the annular groove (28) is arranged along the circumferential direction of the main shaft (16), and the air inlet groove (27) is communicated with the annular groove (28); a bearing sleeve (7) is arranged on the other side of the flange I (6), an oil filling port (10) is formed in the bearing sleeve (7), and the bearing sleeve (7) is sleeved outside the thrust bearing (12) and the self-aligning roller bearing (22) respectively; the flange I (6) is provided with a bearing sealing air interface (8), and the bearing sealing air interface (8) is communicated with the air inlet groove (27).

8. The screw feeder for the fluidized bed gasification furnace according to claim 6 or 7, wherein: bearing glands (11) are arranged on the thrust bearing (12) and the self-aligning roller bearing (22).

9. The screw feeder of claim 8, wherein: one end of the main shaft (16) connected with the driving device is also provided with a hoop (5), and the hoop (5) is connected with the thrust bearing (12).

10. The screw feeder for the fluidized bed gasification furnace according to claim 1, wherein: the spiral blade comprises a forward spiral blade (17) arranged on the main shaft (16) and a reverse spiral blade (18) arranged at one end, close to the discharge hole (23), of the main shaft (16), the rotating direction of the forward spiral blade (17) is the same as the material conveying direction, and the rotating direction of the reverse spiral blade (18) is opposite to that of the forward spiral blade (17).

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