Grate for a biomass gasifier

Abstract

The application discloses a furnace grate of a biomass gasification furnace, which mainly comprises a gasification furnace body, heat exchange water pipes equidistantly arranged at the bottom end of furnace slag in the gasification furnace, and a main shaft connected with the inner wall of the furnace body and arranged at the bottom end of the heat exchange water pipes in an equidistant manner in the axial direction, wherein the outer side of the main shaft is connected with a turning piece arranged between two heat exchange water pipes in the axial direction, and a ventilation hole is formed in the surface of the turning piece in a circumferential direction. The connecting rod and the sliding rod arranged at the inner side of the ventilation hole are moved to the gravity end of the ventilation hole relative to the ventilation hole due to the gravity of the connecting rod and the sliding rod when the ventilation hole rotates along with the turning piece, so that the sliding rod always performs the slag cleaning process on the side close to the gravity of the inner side of the ventilation hole, the slag entering the inner side of the ventilation hole due to the rotation of the turning piece is reduced, and the effect of the turning piece on the ventilation and cooling through the ventilation hole is facilitated.

Description

Technical Field

[0001] This application relates to the field of gasifier technology, and more particularly to a grate for a biomass gasifier. Background Technology

[0002] A biomass gasification furnace is a combustion furnace that uses agricultural and forestry waste, such as straw, corn cobs, and waste wood blocks, as raw materials and fuel. In the entire furnace, wet materials are sent to an externally heated steam dryer for pre-drying, and then sent to a screw conveyor for pyrolysis at 600°C. The pyrolysis product enters the third pyrolysis zone, where it undergoes aerobic high-temperature pyrolysis at 1100°C, which removes 99% of the tar. The remaining coke is then gasified through a hot coke bed to remove the remaining tar. Finally, the gas with almost no tar is sent out from the outlet, and the resulting combustible gas is used for power generation.

[0003] The grate in the gasifier serves to carry fuel and separate slag. However, due to the characteristics of the fuel used in the biomass gasifier and the operation, coking is prone to occur inside the furnace when the temperature exceeds the ash melting point. Since the gasifier requires a sealed environment, once coking occurs inside the furnace, large coke blocks are difficult to remove from the furnace. The furnace must be shut down for manual slag removal, which reduces the cleaning difficulty and combustion efficiency. Summary of the Invention

[0004] This application proposes a grate for a biomass gasifier, which has the advantages of improving slag discharge efficiency and ensuring air tightness, thereby solving the problems of difficult slag discharge and low slag discharge air tightness.

[0005] To achieve the above objectives, this application adopts the following technical solution: a grate for a biomass gasification furnace, comprising a gasification furnace body, wherein hot water exchange pipes are evenly distributed at the bottom end of the slag inside the gasification furnace, the bottom end of the slag being the plane where line a is located, and a main shaft connected to the inner wall of the furnace body is axially evenly provided at the bottom end of the hot water exchange pipes, wherein a turning plate located between two hot water exchange pipes is axially connected to the outer side of the main shaft, wherein a vent hole is circumferentially opened on the surface of the turning plate, and a reverse serrated groove is circumferentially opened on the outer side of the turning plate, wherein a fixing plate is radially fixedly connected to the inner side of the vent hole, wherein a connecting rod is hinged to one end of the fixing plate at the center of the vent hole, and a sliding rod is fixedly connected to one end of the connecting rod near the inner wall of the vent hole.

[0006] Furthermore, an anti-serrated groove is formed on the outer side of the flipping plate. The circumference of the flipping plate is serrated with the tips of the serrations pointing clockwise. A square groove is formed on the outer side of the flipping plate on the counterclockwise side of the anti-serrated groove. A spring is fixedly connected to the inner side of the square groove facing the vent. A fixing head is connected to the square groove through the spring. A connecting groove is formed on the side of the fixing head. A connecting rope is fixedly connected to the fixing head through the bottom end face of the connecting groove. An arc-shaped groove is formed on the inner wall of each vent. A movable rod is slidably connected to the inner side of the vent. The outer side of the connecting rope passes through the flipping plate and passes through the inner side of the arc-shaped groove to be fixedly connected to the side of the movable rod. The connecting rope slides on the inner side of the flipping plate.

[0007] Furthermore, the agitator is semi-circular, and the top of the agitator and the hot water pipe tend to be in the plane where line a is located, and the plane where line a is located is parallel to the horizontal plane.

[0008] Furthermore, when the flipping plate rotates clockwise through the plane where line a is located, the fixing plate inside each vent hole moves downward from the center of the vent hole to the inner wall of the vent hole perpendicular to the plane where line a is located, and the connecting rod is located in the clockwise direction of the fixing plate.

[0009] Furthermore, the spring elastic pull fixing head is located inside the square groove, and the connecting rope near the fixing head passes through the inside of the flip plate in an inverted "L" shape. The spring pull fixing head makes the connecting rope in an inverted "U" shape inside the connecting groove and the main shaft.

[0010] Furthermore, the fixing head is located on the circumferential side of the flipping plate and has the same circumferential shape as the flipping plate, and the tip of the fixing head faces the opposite direction to the tip of the circumferential saw teeth of the flipping plate.

[0011] Furthermore, the arc-shaped groove is an arc-shaped groove on the inner wall of the vent, and a movable rod that is always in close contact is slidably connected to the top of the arc-shaped groove.

[0012] Furthermore, the movable rod slides between the two ends of the arc-shaped groove, and the fixed head is located inside the square groove in the initial state. In the initial state, the movable rod is located on the other side of the fixed plate in the same radial direction and is in close contact with the inner wall of the vent hole, and the arc-shaped groove extends from one end of the movable rod to the vent hole in a clockwise direction.

[0013] This application provides a grate for a biomass gasifier. Through connecting rods and sliding rods installed inside the vent holes, as the vent holes rotate with the turning plates, the connecting rods and sliding rods inside the vent holes move towards the gravity end relative to the vent holes due to their own weight. This ensures that the sliding rods are always close to the gravity side inside the vent holes, cleaning the slag and reducing the amount of slag entering the vent holes during the rotation of the turning plates. This facilitates ventilation and cooling through the vent holes. Furthermore, during the rotation of the connecting rods and sliding rods, the side of the sliding rod impacts the side of the fixed plate and the side of the movable rod. The vibration generated by this impact is transmitted, causing the slag adhering to the surface of the turning plates to be dislodged. Simultaneously, the vibration of the turning plates causes the slag above the discharged slag to move downwards, making the remaining slag more compact and ensuring a tighter seal during slag discharge from the gasifier. Attached Figure Description

[0014] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles disclosed in this application.

[0015] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein:

[0016] Figure 1 This is a three-dimensional view of the overall structure of the grate of the present invention;

[0017] Figure 2 This is a diagram showing the non-working state of the flip-plate structure of the present invention;

[0018] Figure 3 This is a diagram showing the state of the flip-up plate structure rotating clockwise and moving above line a.

[0019] Figure 4 This is a diagram showing the state of the flip-up plate structure rotating counterclockwise and moving above line a.

[0020] Figure 5 This is a view of the fixed head structure extending out of the inner side of the square groove structure of the present invention;

[0021] Figure 6 This is a diagram showing the flip-plate structure of the present invention rotating clockwise back to below line a. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application. Example

[0023] Please see Figure 1 A grate for a biomass gasifier includes a gasifier body, and hot water exchange pipes 1 are evenly distributed at the bottom of the slag inside the gasifier. (Reference) Figure 2 The diagram shows the non-working state of the flipper 3. The bottom end of the slag is the plane containing line a, and the straight line containing line a is flush with the top surface of the flipper 3 in the non-working state. The top surface of the hot water exchange pipe 1 and the top surface of the flipper 3 located between the hot water exchange pipes 1 form the grate surface. The top surface of the flipper 3 is slightly lower than the plane of the hot water exchange pipe 1, which can better cool the ash and slag and protect the flipper from heat. The bottom end of the hot water exchange pipe 1 is axially and equidistantly provided with main shafts 2 connected to the inner wall of the furnace. Each main shaft 2 is driven to rotate by a motor and belt. The outer side of the main shaft 2 is axially connected to the flipper 3 located between two hot water exchange pipes 1. The rotation of the main shaft 2 drives the flipper 3 to rotate. Adjacent main shafts The two rotating plates 2 rotate in different directions to prevent slag from accumulating on one side. Ventilation holes 4 are provided around the surface of the turning plate 3. The ventilation holes 4 reduce the overall weight of the turning plate 3. At the same time, the opening of the ventilation holes 4 facilitates the ventilation and cooling of the turning plate 3. The outer circumferential of the turning plate 3 is provided with anti-serrated grooves 5 at equal angles. A fixing plate 6 is fixedly connected to the inner radial side of the ventilation hole 4. A connecting rod 7 is hinged to one end of the fixing plate 6 at the center of the ventilation hole 4. A sliding rod 8 is fixedly connected to one end of the connecting rod 7 near the inner wall of the ventilation hole 4. The two ends of the sliding rod 8 protrude from the two sides of the turning plate 3, which facilitates the interaction between the sliding rod 8 and the slag when the turning plate 3 rotates into the inner side of the slag.

[0024] Please see Figure 2 When the main shaft 2 rotates clockwise, the flipping plate 3 rotates along with the main shaft 2, causing the venting holes 4 on the surface and the structures inside the venting holes 4 to rotate synchronously. Under their own weight, the connecting rod 7 and sliding rod 8 inside the venting holes 4 remain perpendicular to line a as the venting holes 4 rotate. When each venting hole 4 passes the plane containing line a, the slag above line a pushes the connecting rod 7 and sliding rod 8 to the furthest point inside the venting hole 4 away from the direction of rotation, ensuring that the connecting rod 7 and sliding rod 8 maintain their position inside the venting hole 4 just after passing line a. Simultaneously, the rotation of the flipping plate 3 causes its circumferential serrations to break up the slag above line a. As the flipping plate 3 continues to rotate, when the venting hole 4 passes the plane containing line a on the other side of the main shaft 2 again, [reference needed]. Figure 6The sliding rod 8 will move towards the gravity end inside the vent 4 due to its own weight at the moment it passes line a, thus bringing the sliding rod 8 closer to the movable rod 14 and causing it to vibrate upon impact. This vibration causes the sliding rod 8 to clean the slag entering the vent 4 while rotating. As the vent 4 rotates below line a, the sliding rod 8 will follow the change in the gravity end of the vent 4 and continue to clean the slag entering the vent 4 at the gravity end inside the vent 4. The sliding rod 8 will always be perpendicular to line a due to its own weight, and it will also vibrate upon impacting the side of the connecting rod 7 during rotation. The vibration generated by the sliding rod 8 impacting the connecting rod 7 and the movable rod 14 is then transmitted to the turning plate 3, causing the turning plate 3 to vibrate and causing the slag attached to its surface to fall off. At the same time, the vibration of the turning plate 3 is transmitted to the slag above, making the slag more compact and ensuring the airtightness of the gasifier. Example

[0025] Please see Figure 2 The outer side of the turning plate 3 has a sawtooth groove 5. The turning plate 3 is serrated in the circumference with the tips of the serrations pointing clockwise. The sawtooth groove 5 allows the turning plate 3 to break up the coke blocks in the furnace during its clockwise rotation. The slag then passes through the gaps between the turning plates 3 and between the turning plate 3 and the hot water pipe 1. The rotation of the turning plate 3 itself causes the slag to fall into the lower ash bin, and then the slag is discharged from the furnace by the spiral shaft. A square groove 9 is located on the counter-clockwise side of the sawtooth groove 5 on the outer side of the turning plate 3. (Reference) Figure 5 A spring is fixedly connected to the inner side of the square groove 9 facing the vent 4. A fixing head 10 is connected to the square groove 9 via the spring. A connecting groove 11 is provided on the side of the fixing head 10. A connecting rope 12 is fixedly connected to the fixing head 10 through the bottom end face of the connecting groove 11, and the connecting rope 12 is always in a taut state. (Reference) Figure 2 Each vent hole 4 has an arc-shaped groove 13 on its inner wall. A movable rod 14 is slidably connected to the inner side of the vent hole 4. The outer side of the connecting rope 12 passes through the flip plate 3 and passes through the inner side of the arc-shaped groove 13 to be fixedly connected to the side of the movable rod 14. The connecting rope 12 slides on the inner side of the flip plate 3, that is, pushing the movable rod 14 can pull the fixed head 10 through the connecting rope 12. The number of fixed heads 10 is a multiple of the number of vent holes 4, and the quotient obtained by dividing the number of fixed heads 10 by the number of vent holes 4 is the number of fixed heads 10 pulled by the movable rod 14 inside one vent hole 4.

[0026] Please see Figure 2The agitator 3 is semi-circular, and the top of the agitator 3 and the hot water pipe 1 tend to be on the plane where line a is located. The plane where line a is located is parallel to the horizontal plane. The agitator 3 is made of heat-resistant steel. The shape of the agitator 3 makes the slag discharge surface formed by the hot water pipe 1 and the agitator 3 more compact and flat. The shape of the agitator 3 facilitates the rotation of the agitator 3, and the slag is crushed by the saw teeth formed by the axially opened anti-saw groove 5.

[0027] Please see Figures 3-4 , Figure 6 When the flipping plate 3 rotates clockwise through the plane containing line a, the fixing plate 6 inside each vent hole 4 moves downward from the center of the vent hole 4 to the inner wall of the vent hole 4 perpendicular to the plane containing line a. The connecting rod 7 is located clockwise on the fixing plate 6. The two connecting rods 7 are respectively located on both sides of the fixing plate 6 in a radial direction within the vent hole 4. The sliding rod 8 is a rod tightly attached to the vent hole 4. The connecting rod 7 rotates and moves only around the vent hole 4, except for the position of the fixing plate 6, through the sliding rod 8. The sliding rod 8 cleans the slag inside the vent hole 4 in the circumferential direction, reducing slag residue and allowing for rapid slag discharge. This reduces the weight of the flipping plate 3 and facilitates its movement. Simultaneously, due to the position setting of the fixing plate 6, when the main shaft 2 rotates clockwise, the weight of the connecting rod 7 and the sliding rod 8 causes the fixing plate 6 and the connecting rod 7 to tend towards the same radius. The position is such that the fixed plate 6 and the connecting rod 7 simultaneously enter the area above line a. As the flipping plate 3 continues to rotate and move below line a, the fixed plate 6 and the connecting rod 7 simultaneously move below a. The range of movement of the connecting rod 7 and the sliding rod 8 due to their own gravity is a semi-circle clockwise from the position of the fixed plate 6. When the main shaft 2 rotates counterclockwise, the gravity of the connecting rod 7 and the sliding rod 8 causes the fixed plate 6 and the connecting rod 7 to no longer be in the same radius position. That is, the fixed plate 6 moves above a first, and then the connecting rod 7 and the sliding rod 8 move above a again, so that there is an obtuse angle between the fixed plate 6 and the connecting rod 7. That is, after the flipping plate 3 continues to rotate and causes the fixed plate 6 to move below a first, the connecting rod 7 and the sliding rod 8 move below a again due to gravity. At this time, the range of movement of the connecting rod 7 and the sliding rod 8 is a semi-circle counterclockwise from the position of the connecting rod 7 inside the vent 4.

[0028] Please see Figure 2 , Figure 5The spring inside the square groove 9 elastically pulls the fixing head 10 to be located inside the square groove 9. The connecting rope 12, near the fixing head 10, passes through the inside of the flip plate 3 in an inverted "L" shape. The spring pulls the fixing head 10, causing the connecting rope 12 to form an inverted "U" shape inside the connecting groove 11 and the main shaft 2. The elasticity of the spring keeps the fixing head 10 in the state inside the square groove 9. When the fixing head 10 is inside the square groove 9, the connecting rope 12 will be pulled by the fixing head 10 to form an inverted "U" shape. The shape allows the fixed head 10 to extend out of the square groove 9 when the connecting rope 12 is pulled by the movable rod 14. This allows the fixed head 10 to perform the slag crushing process on the outside of the square groove 9, so that the entire turning plate 3 can effectively crush the slag through the serrated tip, whether it is clockwise or counterclockwise. At the same time, the extension of the fixed head 10 can also clean the slag attached to the outside of the turning plate 3, reducing the extra weight of the turning plate 3 due to the slag load.

[0029] Please see Figure 4 The fixed head 10 is located on the circumferential side of the flipping plate 3 and has the same circumferential shape as the flipping plate 3. The tip of the fixed head 10 faces the opposite direction of the tip of the circumferential sawtooth of the flipping plate 3. That is, the fixed head 10 and the sawtooth shape formed after the anti-sawtooth groove 5 is opened on the outer side of the flipping plate 3 are the same. When the flipping plate 3 rotates counterclockwise, the slag is crushed through the fixed head 10. After the slag is crushed and discharged, the slag above will be shaken off by the vibration generated by the fixed head 10 retracting into the inner side of the square groove 9, the vibration generated by the collision of the sliding rod 8 and the fixed plate 6, and the vibration generated by the collision of the sliding rod 8 and the movable rod 14. In turn, the vibration causes the slag above to move downward while making the slag more tightly connected, ensuring the sealing of the gasifier itself during the slag discharge process and improving the sealing effect during slag discharge.

[0030] Please see Figure 2 The arc-shaped groove 13 is an arc-shaped groove on the inner wall of the vent 4. The top of the arc-shaped groove 13 is slidably connected to a movable rod 14 that is always in close contact. The arc-shaped groove 13 is set inside the inner wall of the vent 4, and one end of the arc-shaped groove 13 is located in the same radial direction as the fixed plate 6, while the other end of the arc-shaped groove 13 is clockwise. This ensures that the arc-shaped groove 13 is not on the path of the sliding rod 8 when the flipping plate 3 rotates clockwise, but is on the path of the sliding rod 8 when the flipping plate 3 rotates counterclockwise. Thus, the extension of the fixed head 10 is controlled by the difference between clockwise and counterclockwise rotation. When the fixed head 10 is inside the square groove 9, the flipping plate 3 works clockwise, and when the fixed head 10 is outside the square groove 9, the flipping plate 3 works counterclockwise. This makes the work of the fixed head 10 more targeted, and the extension of the fixed head 10 can also break the slag attached to the circumference of the flipping plate 3, improving the cleaning efficiency.

[0031] Please see Figures 2-3The movable rod 14 slides between the two ends of the arc-shaped groove 13. The fixed head 10 is located inside the square groove 9 in the initial state. In the initial state, the movable rod 14 is located on the other side of the fixed plate 6 in the same radial direction and is close to the inner wall of the vent hole 4. The arc-shaped groove 13 extends clockwise from one end of the movable rod 14 towards the vent hole 4. When the flipping plate 3 rotates clockwise, the connecting rod 7 and the sliding rod 8 move downwards at a. Since the movable rod 14 is located in the same radial position as the fixed plate 6, the movable rod 14 is located in the gravity end direction inside the vent hole 4. That is, while the connecting rod 7 and the sliding rod 8 move by their own gravity, the vent hole 4 will also rotate with the flipping plate 3, so that the connecting rod 14 moves downwards at this time. The weight of rod 7 and sliding rod 8 cannot push the movable rod 14 to slide. However, as the flipping plate 3 rotates counterclockwise, the fixed plate 6 will first connect rod 7 to the upper part of a. Therefore, the connecting rod 7 and sliding rod 8 will be pushed by the slag during the process of entering the upper part of a. Then, through the interaction force between sliding rod 8 and slag and the weight of sliding rod 8 itself, the movable rod 14 is pushed, causing the movable rod 14 to slide clockwise on the inner wall of the vent hole 4. Then, the sliding of the movable rod 14 pulls the connecting rope 12 inside the arc groove 13, so that the connecting rope 12 can pull the fixed head 10, causing the fixed head 10 to extend out of the inner side of the square groove 9. The slag crushing process is carried out counterclockwise through the tip of the fixed head 10.

[0032] Please see Figure 4When the main shaft 2 rotates counterclockwise, the flipping plate 3, which has never been in operation, is driven by the rotation of the main shaft 2. The vent hole 4 on the surface of the flipping plate 3 will first pass through the plane where line a is located on one side, so that the connecting rod 7 and the sliding rod 8 will be at the gravity end inside the vent hole 4 due to their own weight. At this time, the movable rod 14 is located at the gravity end inside the vent hole 4, so that the side of the sliding rod 8 abuts against the side of the movable rod 14. As the flipping plate 3 rotates and gradually penetrates into the slag, the slag will push the connecting rod 7 and the sliding rod 8, so that the connecting rod 7 and the sliding rod 8 are pushed by the slag and thus push the movable rod 14. 4. Move the movable rod 14 in the opposite direction to the rotation direction of the flipping piece 3 inside the vent hole 4. This causes the sliding rod 8 to push the movable rod 14 to move closer to the other end of the fixed plate 6 in the arc groove 13. Simultaneously, after the movable rod 14 is pushed, the side of the movable rod 14 pulls the connecting rope 12 into the inner side of the arc groove 13, causing the connecting rope 12 to pull the fixed head 10. This causes one end of the connecting rope 12 located inside the connecting groove 11 to slide along the inverted "U" shaped path. Consequently, the end of the connecting rope 12 pulls the fixed head 10 towards the outer side of the flipping piece 3 through the inner side of the connecting groove 11. The fixed head 10 is moved so that it protrudes beyond the outer side of the square groove 9. As the fixed head 10 extends, it pushes out the coke lumps attached to the circumference of the turning plate 3, facilitating cleaning of the circumferential surface of the turning plate 3. After the turning plate 3 enters the slag, the tip of the fixed head 10 also performs circumferential slag crushing, facilitating slag discharge. The turning plate 3 continues to move. When a vent 4 passes the a-line on one side again, the connecting rod 7 and sliding rod 8 inside the vent 4 will move to the gravity end inside the vent 4 under their own weight. At this time, the fixed plate 6 approaches the gravity end inside the vent 4. The position of the connecting rod 7 and the sliding rod 8 causes them to impact the outer side of the fixed plate 6 during rotation, generating vibration. This causes the entire flipping plate 3 to vibrate and drives the slag above it to vibrate, causing the slag attached to the surface of the flipping plate 3 to be shaken off. The slag above the flipping plate 3 becomes more compact due to the vibration. At the same time, the rotation of the connecting rod 7 and the sliding rod 8 causes the slag entering the vent 4 to be scraped out. The movement of the connecting rod 7 and the sliding rod 8 releases the movable rod 14, causing the fixed head 10 to be pulled back by the square groove 9 again. This moves the movable rod 14 to the end of the arc groove 13 that is circumferentially away from the fixed plate 6, waiting for the next action.

Claims

1. A grate for a biomass gasification furnace, characterized in that, The gasifier includes a gasifier body. The bottom of the slag inside the gasifier is provided with heat exchange pipes (1) at equal intervals. The bottom of the slag is the plane where line a is located. The bottom of the heat exchange pipes (1) is provided with a main shaft (2) connected to the inner wall of the gasifier body at equal axial intervals. The outer side of the main shaft (2) is connected with a turning plate (3) located between two heat exchange pipes (1). The surface of the turning plate (3) is provided with a ventilation hole (4) in the circumferential direction. The outer side of the turning plate (3) is provided with a reverse sawtooth groove (5) at equal angles. The inner side of the ventilation hole (4) is fixedly connected with a fixing plate (6). The fixed plate (6) is hinged to a connecting rod (7) at one end of the center of the ventilation hole (4). The connecting rod (7) is fixedly connected to a sliding rod (8) at one end near the inner wall of the ventilation hole (4). The flipping plate (3) has an anti-serrated groove (5) on its outer side. The flipping plate (3) is serrated in the circumference and the tips of the serrations face the clockwise direction of the flipping plate (3). The flipping plate (3) has a square groove (9) on its outer side located on the counterclockwise side of the anti-serrated groove (5). A spring is fixedly connected to the inner side of the square groove (9) facing the vent (4). The square groove (9) is connected to a fixing head (10) through the spring. A connecting groove is provided on the side of the fixing head (10). 11), the fixed head (10) is fixedly connected to the bottom end face of the connecting groove (11) with a connecting rope (12), and each of the ventilation holes (4) has an arc groove (13) on its inner wall. The inner side of the ventilation hole (4) is slidably connected to a movable rod (14). The outer side of the connecting rope (12) passes through the flip plate (3) and passes through the inner side of the arc groove (13) to be fixedly connected to the side of the movable rod (14). The connecting rope (12) slides on the inner side of the flip plate (3). The flipping plate (3) is semi-circular, and the top of the flipping plate (3) and the hot water pipe (1) tend to be in the plane where line a is located. The plane where line a is located is parallel to the horizontal plane. The spring elastic pull fixing head (10) inside the square groove (9) is located inside the square groove (9). The connecting rope (12) near the fixing head (10) passes through the inside of the flip plate (3) in an inverted "L" shape. The spring pull fixing head (10) makes the connecting rope (12) in an inverted "U" shape inside the connecting groove (11) and the main shaft (2).

2. The grate of a biomass gasification furnace according to claim 1, characterized in that, When the flipping plate (3) rotates clockwise through the plane where line a is located, the fixing plate (6) inside the vent (4) moves downward from the center of the vent (4) to the inner wall of the vent (4) perpendicular to the plane where line a is located, and the connecting rod (7) is located in the clockwise direction of the fixing plate (6).

3. The grate of a biomass gasification furnace according to claim 1, characterized in that, The fixing head (10) is located on the circumferential side of the flipping plate (3) and has the same circumferential shape as the flipping plate (3). The tip of the fixing head (10) faces the opposite direction of the tip of the circumferential saw teeth of the flipping plate (3).

4. The grate of a biomass gasification furnace according to claim 1, characterized in that, The arc groove (13) is an arc groove on the inner wall of the vent (4), and the top of the arc groove (13) is slidably connected to a movable rod (14) that is always in close contact.

5. The grate of a biomass gasification furnace according to claim 4, characterized in that, The movable rod (14) slides between the two ends of the arc groove (13). The fixed head (10) is located inside the square groove (9) in the initial state. In the initial state, the movable rod (14) is located on the other side of the fixed plate (6) in the same radial direction and is close to the inner wall of the vent hole (4). The arc groove (13) extends from one end of the movable rod (14) to the vent hole (4) in a clockwise direction.

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