A biomass gasifier with high efficiency and stable operation and use method thereof

Abstract

The present invention discloses a biomass gasifier with high efficiency and stable operation and a method for using the same, and relates to the technical field of biomass gasifiers, comprising: a gasifier body, a feeding mechanism, a blast mechanism, a tower-shaped grate, an ash pan, a supporting base and a slewing bearing, wherein the gasifier body is fixed to the ground through a supporting frame; the feeding structure is used for conveying biomass raw materials into the gasifier body; the blast mechanism is used for blowing air to the gasifier body to gasify the biomass raw materials in the gasifier body; the top of the tower-shaped grate extends into the gasifier body; the top surface of the ash pan is fixedly connected to the bottom end of the tower-shaped grate; the slewing bearing comprises an inner ring and an outer ring, the inner ring is arranged on the inner side of the outer ring and is rotatably connected to the outer ring coaxially, the inner ring is fixedly connected to the bottom of the ash pan, and the outer ring is fixedly connected to the top of the supporting base, the structure is simple, the use is convenient, and the stability of the operation of the biomass gasifier is effectively guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of biomass gasifiers, and in particular to a biomass gasifier with high efficiency and stable operation and a use method thereof. Background Art

[0002] Biomass gasifier is a device that produces combustible gas by high-temperature cracking and reduction reaction of agricultural and forestry waste such as wood chips, bamboo, rice husks, and fruit shells. The biomass raw materials enter the gasifier body through the conveying device, and produce clean and environmentally friendly biomass gas through oxidation, reduction, pyrolysis, drying and other stages.

[0003] During the actual operation of the existing gasifier, the tower-type grate in the tower-type furnace slag discharge mechanism receives pressure in the axial direction of the biomass gasifier during rotation, and is also subjected to pressure in the radial direction of the biomass gasifier. The ash pan in the prior art and the bottom support seat use an upper and lower structure sliding guide structure to achieve relative rotation. The upper and lower structure sliding guide structure has insufficient radial bearing capacity, which causes the sliding guide structure to be damaged during the rotation of the ash pan and the tower furnace, seriously affecting the normal operation of the gasifier. Summary of the invention

[0004] The purpose of the present invention is to provide a biomass gasifier with high efficiency and stable operation and a method of use, so as to solve the problems existing in the above-mentioned prior art, with simple structure, convenient use and effective guarantee of the stability of the operation of the biomass gasifier.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a biomass gasifier with high efficiency and stable operation, comprising: a gasifier body, a feeding mechanism, a blast mechanism, a tower-type grate, an ash pan, a support base and a slewing bearing, wherein the gasifier body is fixed to the ground by a support frame; the feeding structure is used to transport biomass raw materials into the gasifier body; the blast mechanism is used to blow air into the gasifier body to gasify the biomass raw materials in the gasifier body; the top of the tower-type grate extends into the gasifier body; the top surface of the ash pan is fixedly connected to the bottom end of the tower-type grate; the support base is located below the gasifier body; the slewing bearing comprises an inner ring and an outer ring, the inner ring is arranged on the inner side of the outer ring and is coaxially rotatably connected with the outer ring, the inner ring is fixedly connected to the bottom of the ash pan, and the outer ring is fixedly connected to the top of the support base.

[0007] Preferably, the slewing bearing also includes a plurality of balls, a first annular groove is provided on the side of the inner ring facing the outer ring, and a second annular groove is provided on the side of the outer ring facing the inner ring, the first annular groove and the second annular groove are arranged correspondingly and form a ball rotation groove, and each of the balls is rollingly connected in the ball rotation groove so that the inner ring and the outer ring can rotate relative to each other.

[0008] Preferably, the slewing bearing also includes a ring plate, which is fixedly connected to the bottom of the inner ring and protrudes outward from the inner ring. A third annular groove is provided on the inner side of the outer ring. The third annular groove is provided below the second annular groove, and the ring plate is used to extend into the third annular groove.

[0009] Preferably, the blowing mechanism includes a blower, a first gas pipeline and a second gas pipeline, one end of the first gas pipeline is connected to the gas delivery end of the blower, and the other end is connected to the air intake pipeline at the bottom of the gasifier body, one end of the second gas pipeline is connected to the first gas pipeline, and the other end is connected to the oxidation zone of the gasifier body.

[0010] Preferably, the blowing mechanism also includes an annular pipe and a plurality of gas branch pipes, wherein the gas branch pipe passes through the side wall of the gasifier body and is sealed and connected to the gasifier body, one end of the gas branch pipe is connected to the oxidation zone, and the other end is connected and communicated with the annular pipe, and the annular pipe is connected to one end of the second gas pipeline away from the blower.

[0011] Preferably, it also includes a plurality of tees and a plurality of sealing flanges, the tee is provided with a first connecting port, a second connecting port and a third connecting port, the first connecting port and the second connecting port are coaxially arranged, the axis of the third connecting port is perpendicular to the axis of the first connecting port, the first connecting port is used to connect and communicate with one end of the gas transmission branch pipe extending out of the gasification furnace body, the sealing flange is used to be detachably sealed and fixedly connected to the second connecting port, and the third connecting port is used to connect and communicate with the annular pipe.

[0012] Preferably, the feeding mechanism includes a conveyor belt, a feed hopper, a valve and a lower barrel. The feed hopper is fixedly connected to the top of the gasifier body, the output end of the conveyor belt is located above the feed hopper to transport the biomass raw material into the feed hopper, the top end of the lower barrel is connected to the bottom of the feed hopper, the bottom end of the lower barrel extends into the gasifier body, and the valve is arranged at the top of the lower barrel.

[0013] Preferably, the discharge barrel is a trapezoidal inverted cone barrel.

[0014] Preferably, it also includes a plurality of slag strips, each of which is fixedly connected to the inner wall of the gasifier body and is evenly arranged in the circumferential direction of the inner wall of the gasifier body, and the top of the slag strip is flush with the top of the tower-type grate to crush the high-temperature ash during the relative rotation with the tower-type grate.

[0015] The present invention also provides a method for using the biomass gasifier with high efficiency and stable operation as described in any one of the above items, comprising the following steps:

[0016] The feeding structure is started to transport the biomass raw materials into the gasifier body, the blowing mechanism is started to blow air into the gasifier body to cause a gasification reaction of the biomass raw materials in the gasifier body, and the slewing bearing drives the ash pan and the tower grate to rotate, so that the ash falls into the ash pan.

[0017] Compared with the prior art, the present invention has achieved the following technical effects:

[0018] 1. The present invention provides a biomass gasifier with efficient and stable operation and a method of use. A slewing bearing is used to replace the sliding guide structure of the upper and lower structures. Compared with the current mainstream sliding guide structure, the slewing bearing can withstand both axial loads and radial loads, and the overall structure is a standard machined part. The structural strength and service life are greatly improved, which can ensure the continuous and stable operation of the rotating slag removal mechanism of the gasifier and effectively improve the stability of the gasification system.

[0019] 2. The gas branch pipe and the annular pipe are connected by a tee, wherein the sealing flange and the second connecting port can be detachably sealed and fixedly connected. When the gas branch pipe is blocked by biomass raw materials or tar in the gasifier, the sealing flange can be opened to clear it, thereby ensuring the annular air supply effect of the gasifier, effectively extending the continuous and efficient operation time of the gasifier, and improving the overall gasification efficiency of the gasifier.

[0020] 3. Insert the trapezoidal inverted cone through the top cover of the biomass gasifier into the biomass gasifier. The biomass raw materials are evenly distributed by the trapezoidal inverted cone, and the even distribution and compaction of the biomass raw materials layer by layer are conducive to ensuring the continuous operation of the gasifier and improving the gasification efficiency of the raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of the structure of a biomass gasifier with high efficiency and stable operation provided by the present invention;

[0023] Figure 2 A schematic diagram of the structure of a slewing bearing in a biomass gasifier with high efficiency and stable operation provided by the present invention;

[0024] Figure 3 A schematic diagram of the structure of the annular tube in the biomass gasifier with high efficiency and stable operation provided by the present invention;

[0025] In the figure: 1. gasifier body; 2. feeding mechanism; 21. conveyor belt; 22. feed hopper; 23. valve; 24. discharge barrel; 3. blowing mechanism; 31. blower; 32. first gas pipeline; 33. second gas pipeline; 34. annular pipe; 35. gas branch pipe; 36. tee; 37. sealing flange; 4. tower grate; 5. ash tray; 6. support base; 7. slewing bearing; 71. inner ring; 72. outer ring; 73. ball; 74. ring plate; 8. slag strip. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The purpose of the present invention is to provide a biomass gasifier with high efficiency and stable operation and a method of use, so as to solve the problems existing in the above-mentioned prior art, with simple structure, convenient use and effective guarantee of the stability of the operation of the biomass gasifier.

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Embodiment 1

[0030] This embodiment provides a biomass gasifier with high efficiency and stable operation. Figures 1 to 3As shown, it includes: a gasifier body 1, a feeding mechanism 2, a blast mechanism 3, a tower-type grate 4, an ash pan 5, a support base 6 and a slewing bearing 7, the gasifier body 1 is fixed on the ground through a support frame; the feeding structure is used to transport the biomass raw material into the gasifier body 1; the blast mechanism 3 is used to blow air to the gasifier body 1 to gasify the biomass raw material in the gasifier body 1; the top of the tower-type grate 4 extends into the gasifier body 1; the top surface of the ash pan 5 is fixedly connected to the bottom end of the tower-type grate 4; the slewing bearing 7 includes an inner ring 71 and an outer ring 72, the inner ring 71 is arranged on the inner side of the outer ring 72 and is coaxially rotatably connected with the outer ring 72, the inner ring 71 is fixedly connected to the bottom of the ash pan 5, and the outer ring 72 is fixedly connected to the top of the support base 6, and through the synergistic effect of various components, the efficient and stable operation of the biomass gasifier is achieved. The gasifier body 1 is fixed by a support frame to ensure stability, the feeding mechanism 2 realizes continuous feeding, the blowing mechanism 3 promotes gasification reaction, the tower grate and the ash pan 5 cooperate to treat ash, the slewing bearing 7 connects the ash pan 5 and the support base 6, and the slewing bearing 7 is set to a horizontal relative rotation of the inner ring 71 and the outer ring 72, which can withstand both axial loads and radial loads. The overall structure is a standard machined part, and the structural strength and service life are greatly improved, which can ensure the continuous and stable operation of the rotary slag removal mechanism of the gasifier and effectively improve the stability of the gasification system.

[0031] In a preferred solution of the present embodiment, the slewing bearing 7 further includes a plurality of balls 73, a first annular groove is provided on the side of the inner ring 71 facing the outer ring 72, and a second annular groove is provided on the side of the outer ring 72 facing the inner ring 71, the first annular groove and the second annular groove are provided correspondingly and form a rotation groove for the balls 73, each ball 73 is rollingly connected in the rotation groove for the balls 73 to enable the inner ring 71 and the outer ring 72 to rotate relative to each other, and the provision of the balls 73 makes the relative rotation between the inner ring 71 and the outer ring 72 smoother, reduces friction resistance, and improves the service life and rotation efficiency of the slewing bearing 7.

[0032] In a preferred solution of the present embodiment, the slewing bearing 7 further includes an annular plate 74, which is fixedly connected to the bottom of the inner ring 71 and protrudes outward from the inner ring 71. A third annular groove is provided on the inner side of the outer ring 72, and the third annular groove is provided below the second annular groove. The annular plate 74 is used to extend into the third annular groove. The provision of the annular plate 74 further ensures the axial force bearing capacity of the slewing bearing 7, enhances the stability of the slewing bearing 7, and ensures the normal operation of the slewing bearing 7.

[0033] In a preferred scheme of the present embodiment, the blowing mechanism includes a blower 31, a first gas pipeline 32 and a second gas pipeline 33. One end of the first gas pipeline 32 is connected to the gas delivery end of the blower 31, and the other end is connected to the air intake pipeline at the bottom of the gasifier body 1. One end of the second gas pipeline 33 is connected to a gas pipeline, and the other end is connected to the oxidation zone of the gasifier body 1. Through the arrangement of the first and second gas pipelines 33, blowing is provided for the bottom of the gasifier body 1 and the oxidation zone respectively, ensuring that the biomass raw materials can get sufficient oxygen supply in different areas, thereby improving the gasification efficiency.

[0034] In a preferred scheme of the present embodiment, the blowing mechanism also includes an annular tube 34 and a plurality of gas branch pipes 35, the gas branch pipes 35 pass through the side wall of the gasifier body 1 and are sealed and connected to the gasifier body 1, one end of the gas branch pipe 35 is connected to the oxidation zone, and the other end is connected and communicated with the annular tube 34, the annular tube 34 is connected to an end of the second gas pipeline 33 away from the blower 31, the arrangement of the annular tube 34 and the gas branch pipes 35 makes the blowing of the oxidation zone more uniform, thereby improving the uniformity and stability of the gasification reaction.

[0035] In a preferred solution of the present embodiment, a plurality of tees 36 and a plurality of sealing flanges 37 are also included. The tees 36 are provided with a first connecting port, a second connecting port and a third connecting port. The first connecting port and the second connecting port are coaxially arranged, and the axis of the third connecting port is arranged perpendicularly to the axis of the first connecting port. The first connecting port is used to connect and communicate with one end of the gas delivery branch pipe 35 extending out of the gasifier body 1, and the sealing flange 37 is used to be detachably sealed and fixedly connected with the second connecting port, and the third connecting port is used to connect and communicate with the annular pipe 34. The arrangement of the tees 36 and the sealing flange 37 facilitates the installation and maintenance of the blast mechanism. The sealing flange 37 can be disassembled for maintenance when necessary. When the gas delivery branch pipe 35 is blocked by biomass raw materials or tar in the gasifier, the inspection pipe can be opened to clear it, so as to ensure the annular air supply effect of the gasifier, effectively extend the continuous and efficient operation time of the gasifier, and improve the overall gasification efficiency of the gasifier. The reliability of the system is improved.

[0036] In a preferred solution of this embodiment, the feeding mechanism 2 includes a conveyor belt 21, a feed hopper 22, a valve 23 and a discharge barrel 24. The feed hopper 22 is fixedly connected to the top of the gasifier body 1. The output end of the conveyor belt 21 is located above the feed hopper 22 to transport the biomass raw material into the feed hopper 22. The top of the discharge barrel 24 is connected to the bottom of the feed hopper 22. The bottom of the discharge barrel 24 extends into the gasifier body 1. The valve 23 is arranged at the top of the discharge barrel 24. The various components of the feeding mechanism 2 work together to achieve continuous and stable feeding of the biomass raw material. The conveyor belt 21 and the feed hopper 22 improve the feeding efficiency. The valve 23 can control the feeding speed and amount to ensure the stable operation of the gasifier.

[0037] In a preferred solution of this embodiment, the lower barrel 24 is a trapezoidal inverted cone barrel. The trapezoidal inverted cone barrel shape of the lower barrel 24 allows the biomass raw materials to enter the gasifier body 1 more evenly, preventing raw materials from piling up and hanging, and improving gasification efficiency.

[0038] In a preferred scheme of the present embodiment, a plurality of slag strips 8 are further included, each of which is fixedly connected to the inner wall of the gasifier body 1 and is evenly arranged in the circumferential direction of the inner wall of the gasifier body 1. The top of the slag strip 8 is flush with the top of the tower-type grate 4, so that the high-temperature ash can be crushed during the relative rotation with the tower-type grate 4. The high-temperature ash produced during the oxidation of the biomass raw materials inside the gasifier is crushed by the relative movement between the tower-type grate 4 and the slag strip 8, and falls into the ash tray 5, which can prevent the accumulation of agglomerated high-temperature ash and affect the normal gasification of the biomass raw materials, thereby effectively ensuring the stable operation of the gasification system.

[0039] In a preferred solution of the present embodiment, the tower grate comprises an outer grate and an inner grate, wherein the outer grate is a tower structure, the bottom edge of the outer grate is used to be tightly connected with the top surface of the ash pan, and the top surface of the outer grate is provided with a plurality of air outlets; the inner grate is a tower structure and is located on the inner side of the outer grate, the bottom edge of the outer grate is used to be tightly connected with the top surface of the ash pan to form an air cooling space between the outer grate and the inner grate, and each air outlet is connected with the air cooling space; the air inlet duct at the bottom of the gasifier body 1 is closed and rotatably connected with the inner grate, One end of the air intake duct at the bottom of the gasifier body 1 is connected to the air cooling space, and the other end is connected to the air source. By arranging an outer grate and an inner grate above the ash tray and forming an air cooling space between the outer grate and the inner grate, air can flow in the space between the inner and outer grate to provide cooling for the outer grate, effectively preventing the outer grate from being deformed or melted due to high temperature. At the same time, the closed rotating connection between the air intake duct at the bottom of the gasifier body 1 and the inner grate ensures the stable delivery of air and improves the stability of the gasifier system.

[0040] Embodiment 2

[0041] This embodiment provides a method for using the biomass gasifier that operates efficiently and stably as in the first embodiment, comprising the following steps:

[0042] 1. Installation and debugging

[0043] Install the gasifier body 1:

[0044] The gasifier body 1 is fixed on the ground through a support frame to ensure firmness and stability.

[0045] Install feeding mechanism 2:

[0046] The feed hopper 22 is fixedly connected to the top of the gasifier body 1 .

[0047] The output end of the conveyor belt 21 is placed above the feed hopper 22 so as to transport the biomass raw materials into the feed hopper 22 .

[0048] The lower barrel 24 is installed so that its top end is connected with the bottom of the feed hopper 22 and its bottom end extends into the gasifier body 1, and a valve 23 is installed on the top of the lower barrel 24. The lower barrel 24 adopts a trapezoidal inverted cone shape.

[0049] Install the blower mechanism 3:

[0050] The first gas delivery pipeline 32 is connected, one end of which is connected to the gas delivery end of the blower 31 , and the other end of which is connected to the gas inlet pipeline at the bottom of the gasifier body 1 .

[0051] The second gas pipeline 33 is connected, one end of which is connected to the first gas pipeline 32 , and the other end of which is connected to the oxidation zone of the gasifier body 1 .

[0052] An annular pipe 34 and a plurality of gas delivery branches 35 are installed. The gas delivery branch pipe 35 passes through the side wall of the gasifier body 1 and is sealed and connected. One end of the gas delivery branch pipe 35 is connected to the oxidation zone, and the other end is connected and communicated with the annular pipe 34.

[0053] A tee 36 is installed at one end of the gas delivery branch pipe 35 extending out of the gasifier body 1 . The third connecting port of the tee 36 is connected to the annular pipe 34 , and the first connecting port is connected to the gas delivery branch pipe 35 .

[0054] A sealing flange 37 is installed at the second communication port of the tee 36 .

[0055] Install slewing bearing 7:

[0056] The inner ring 71 of the slewing bearing 7 is fixedly connected to the bottom of the ash pan 5 , and the outer ring 72 is fixedly connected to the top of the supporting base 6 .

[0057] The slag strips 8 are installed on the inner wall of the gasifier body 1 so as to be evenly arranged in the circumferential direction of the inner wall of the gasifier body 1 , and the top of the slag strips 8 is flush with the top of the tower-shaped grate 4 .

[0058] 2. Operation

[0059] Start feeding mechanism 2:

[0060] The conveyor belt 21 is turned on to transport the biomass raw materials into the feed hopper 22 .

[0061] Open the valve 23 at the top of the lower barrel 24, so that the biomass raw materials evenly enter the gasifier body 1 through the lower barrel 24 in the shape of a trapezoidal inverted cone. With the help of the spreading effect of the trapezoidal inverted cone, the biomass raw materials are evenly distributed and compacted layer by layer, which is conducive to ensuring the continuous operation of the gasifier and improving the raw material gasification efficiency.

[0062] Start the blowing mechanism 3:

[0063] The blower 31 is turned on to supply air to the bottom of the gasifier body 1 through the first gas pipeline 32 to provide oxygen for the biomass raw material and promote the gasification reaction at the bottom.

[0064] At the same time, air enters the annular pipe 34 through the second gas pipeline 33, and is then distributed to each gas branch pipe 35 by the annular pipe 34 to supply air to the oxidation zone of the gasifier body 1. This ensures that the biomass raw materials can get sufficient oxygen supply in different areas, thereby improving the gasification efficiency.

[0065] If the gas delivery branch pipe 35 is blocked by biomass raw materials or tar in the gasifier, the sealing flange 37 can be opened to clear it, thereby ensuring the annular air supply effect of the gasifier, extending the continuous and efficient operation time of the gasifier, and improving the overall gasification efficiency of the gasifier.

[0066] Slewing bearing 7 operation:

[0067] As the gasification reaction proceeds, the slewing bearing 7 drives the ash pan 5 and the tower grate to rotate.

[0068] The high-temperature ash produced during the oxidation of biomass raw materials in the gasifier is crushed under the relative movement of the tower-shaped grate 4 and the slag strip 8, and falls into the ash pan 5. This prevents the accumulation of agglomerated high-temperature ash and slag, which affects the normal gasification of biomass raw materials, and effectively ensures the stable operation of the gasification system.

[0069] The slewing bearing 7 can bear both axial load and radial load, thereby ensuring the continuous and stable operation of the rotary slag removal mechanism of the gasifier and effectively improving the stability of the gasification system.

[0070] 3. Suspension of operation and maintenance

[0071] Stop running:

[0072] The blower 31 is turned off to stop the blowing.

[0073] Close the conveyor belt 21 of the feeding mechanism 2 and the valve 23 of the unloading barrel 24 to stop feeding.

[0074] Maintenance inspection:

[0075] Regularly check the status of various components of the gasifier, such as whether the support frame is firm, whether the feeding mechanism 2 is normal, whether the blast mechanism 3 pipeline is blocked, whether the slewing bearing 7 rotates smoothly, whether the slag strip 8 is worn, etc.

[0076] Repair or replace damaged parts in a timely manner to ensure the performance and stability of the gasifier when it is operated next time.

[0077] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A biomass gasifier with high efficiency and stable operation, characterized by: include: A gasifier body (1), wherein the gasifier body (1) is mounted on a support frame; A feeding mechanism (2), the feeding mechanism (2) being located at the upper end of the gasifier body (1) and being used for conveying biomass raw materials into the gasifier body (1); An air blowing mechanism (3), the air blowing mechanism (3) being located at one side of the lower part of the gasifier body (1) and being used for blowing air to the gasifier body (1) so as to cause a gasification reaction of the biomass raw materials in the gasifier body (1); A support base (6), the support base (6) being located below the gasification furnace body (1); A slewing bearing (7), wherein an outer ring (72) of the slewing bearing (7) is fixedly connected to the top of the supporting base (6); An ash tray (5), the ash tray (5) being located above the slewing bearing (7) and fixed to its inner ring (71); A tower-shaped grate (4), the top of which extends into the gasification furnace body (1), and the lower end of which is fixed to the ash tray (5).

2. The biomass gasifier with high efficiency and stable operation according to claim 1 is characterized in that: The slewing bearing (7) further comprises a plurality of balls (73); a first annular groove is provided on a side of the inner ring (71) facing the outer ring (72); a second annular groove is provided on a side of the outer ring (72) facing the inner ring (71); the first annular groove and the second annular groove are provided correspondingly and form a ball (73) rotation groove; each of the balls (73) is rollingly connected in the ball (73) rotation groove so that the inner ring (71) and the outer ring (72) rotate relative to each other.

3. The biomass gasifier with high efficiency and stable operation according to claim 2 is characterized in that: The slewing bearing (7) further comprises an annular plate (74), wherein the annular plate (74) is fixedly connected to the bottom of the inner ring (71) and protrudes outward from the inner ring (71); a third annular groove is arranged on the inner side of the outer ring (72), wherein the third annular groove corresponds to the bottom of the second annular groove; and the annular plate (74) is used to extend into the third annular groove.

4. The biomass gasifier with high efficiency and stable operation according to claim 1 is characterized in that: The blowing mechanism comprises a blower (31), a first gas pipeline (32) and a second gas pipeline (33); one end of the first gas pipeline (32) is connected to the gas delivery end of the blower (31), and the other end is connected to the air inlet pipeline at the bottom of the gasifier body (1); one end of the second gas pipeline (33) is connected to the first gas pipeline, and the other end is connected to the oxidation zone of the gasifier body (1).

5. The biomass gasifier with high efficiency and stable operation according to claim 4 is characterized in that: The blast mechanism further includes an annular tube (34) and a plurality of gas supply branch pipes (35), wherein the gas supply branch pipes (35) pass through the side wall of the gasifier body (1) and are sealedly connected to the gasifier body (1), one end of the gas supply branch pipe (35) is connected to the oxidation zone, and the other end is connected and communicated with the annular tube (34), and the annular tube (34) is connected to an end of the second gas supply pipeline (33) away from the blower (31).

6. The biomass gasifier with high efficiency and stable operation according to claim 5 is characterized in that: It also includes a plurality of tees (36) and a plurality of sealing flanges (37), wherein the tee (36) is provided with a first connecting port, a second connecting port and a third connecting port, wherein the first connecting port and the second connecting port are coaxially arranged, and the axis of the third connecting port is arranged perpendicular to the axis of the first connecting port, wherein the first connecting port is used to be connected and communicated with an end of the gas delivery branch pipe (35) extending out of the gasifier body (1), wherein the sealing flange (37) is used to be detachably sealed and fixedly connected with the second connecting port, and wherein the third connecting port is used to be connected and communicated with the annular pipe (34).

7. The biomass gasifier with high efficiency and stable operation according to claim 1 is characterized in that: The feeding mechanism (2) comprises a conveyor belt (21), a feed hopper (22), a valve (23) and a lower barrel (24); the feed hopper (22) is fixedly connected to the top of the gasifier body (1); the output end of the conveyor belt (21) is located above the feed hopper (22) to transport the biomass raw material into the feed hopper (22); the top end of the lower barrel (24) is connected to the bottom of the feed hopper (22); the bottom end of the lower barrel (24) extends into the gasifier body (1); and the valve (23) is arranged at the top of the lower barrel (24).

8. The biomass gasifier with high efficiency and stable operation according to claim 7 is characterized in that: The lower material cylinder (24) is a trapezoidal inverted cone cylinder.

9. The biomass gasifier with high efficiency and stable operation according to claim 1 is characterized in that: It also includes a plurality of slag-beating bars (8), each of which is fixedly connected to the inner wall of the gasifier body (1) and is evenly arranged in the circumferential direction of the inner wall of the gasifier body (1), and the top of the slag-beating bar (8) is flush with the top of the tower-type grate (4) so ​​as to crush the high-temperature ash during the relative rotation with the tower-type grate (4).

10. A method for using the biomass gasifier with high efficiency and stable operation according to any one of claims 1 to 9, characterized in that: The following steps are involved: The feeding structure is started to transport the biomass raw material into the gasification furnace body (1), the blowing mechanism (3) is started to blow air into the gasification furnace body (1) to cause the biomass raw material in the gasification furnace body (1) to undergo a gasification reaction, and the slewing bearing (7) drives the ash pan (5) and the tower grate to rotate, causing the ash to fall into the ash pan (5).

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