A reciprocating grate gasifier

Abstract

The present application relates to the technical fields of gasification furnace, and disclose a reciprocating grate gasification furnace, including furnace body, the furnace body is internally provided with gasification cavity, the bottom of the furnace body is provided with air inlet hole in both ends, the both ends of the gasification cavity inner wall is provided with rotation hole and reciprocating groove, the rotation hole is movably sleeved with center roller I, the reciprocating groove is movably sleeved with center roller II.The present application is through the process of shaking of the relative reciprocating motion of grate I and grate II, the transmission rod in sliding cavity can be extruded to move up and compress spring I, make transmission rod through the stretching pull impact column, and make spring II compression energy storage, when the grate I and grate II are separated in the process of shaking, spring I can push transmission rod down, make pull rope relaxation, so that spring II push impact column and hit the blocking material in the air inlet hole, so that the material is broken loose under the impact, so as to complete the cleaning of the air inlet hole.

Description

Technical Field

[0001] This invention relates to the field of gasifier technology, specifically to a reciprocating grate gasifier. Background Technology

[0002] A gasifier is a device that uses biomass to produce combustible gas through pyrolysis and thermochemical oxidation in a closed, oxygen-deficient environment. The gas is produced by feeding biomass material onto the grate inside the gasifier and then introducing air with a low oxygen content from the bottom. This ignites the oxidation zone at the bottom of the material, causing the material in the oxidation zone to burn and generate a large amount of heat under oxygen-deficient conditions. This heat is used to support the pyrolysis reaction in the upper pyrolysis zone and the reduction reaction in the reduction zone.

[0003] The grate is mainly used to support biomass materials. It contains channels for air input. However, after combustion, the waste residue is easily crushed and blocked by compression or other factors, resulting in less air input and reduced combustion efficiency per unit time. This leads to a decrease in subsequent gasification efficiency. Furthermore, the accumulation of materials in the gasifier reduces the upward transfer of gases, steam, and heat generated in different areas. This accumulation also hinders the upward transfer of these gases and heat per unit time, causing many materials in the middle to receive less heat and thus reducing the overall gasification efficiency of the gasifier. Summary of the Invention

[0004] To address the shortcomings of existing reciprocating grates in gasifiers as mentioned in the background art, this invention provides a reciprocating grate gasifier. This gasifier features the advantages of reciprocating motion of grate II, friction between the protrusions on grate II and grate I during reciprocating motion, relative up-and-down movement and vibration of grate I and grate II, continuous changes in material clearance due to vibration, smooth slag discharge due to grate I rotation, compression of waste material on grate II by grate I rotation and resetting, waste material acting as a friction medium, increased clearance between grate I and grate II providing space for airflow, and reciprocating motion of the transmission rod causing the impact column to strike and break up blockages in the gas delivery holes. This invention solves the technical problems of blocked channels and slow gas delivery speed caused by material accumulation within the grate, as mentioned in the background art.

[0005] This invention provides the following technical solution: a reciprocating grate gasifier, comprising a furnace body, a gasification chamber formed within the furnace body, air inlets at both ends of the bottom of the furnace body, and evenly distributed rotating holes and reciprocating grooves on the inner walls of both ends of the gasification chamber. A central roller I is movably sleeved within the rotating holes, and a central roller II is movably sleeved within the reciprocating grooves. A hydraulic cylinder is fixedly connected to one end of the furnace body, and a hydraulic rod is provided within the hydraulic cylinder. The hydraulic rod penetrates into the gasification chamber and is fixedly connected to the bottom end of the central roller II. Evenly distributed motors are fixedly connected to one end of the furnace body, and the output end of the motor is connected to one end of the central roller I. The ends are fixedly connected, and evenly distributed limiting blocks are fixedly connected to both the central roller I and the central roller II. Evenly distributed grate I is movably sleeved on the central roller I, and evenly distributed grate II is movably sleeved on the central roller II. The grate I and the grate II are in contact. A through hole is opened on the grate I, and a movable groove is opened on the inner wall of the through hole. The limiting block is located in the movable groove, and the arc length of the movable groove is greater than the arc length of the limiting block. A protrusion I is provided at the middle of the top of the grate I, and a protrusion II is provided on the bottom of the grate I away from the through hole. The protrusion I on the grate I and the protrusion II on the grate II are in contact.

[0006] Preferably, the bottom end of the grate I is provided with a gas distribution chamber, and the end of the grate I away from the through hole is provided with evenly distributed gas delivery holes. One end of the gas delivery hole is connected to the gas distribution chamber, and the gas delivery hole is inclined downward toward the gas distribution chamber.

[0007] Preferably, the grate I has evenly distributed sliding cavities, which are located on both sides of the gas supply hole. The bottom opening of the sliding cavity is located at the part of the protrusion II. The top of the sliding cavity is fixedly connected to the spring I, and the bottom of the spring I is fixedly connected to the transmission rod, which protrudes from the bottom opening of the sliding cavity.

[0008] Preferably, one end of the transmission rod is fixedly connected to a pull rope, and one end of the pull rope is fixedly connected to an impact column. The impact column is T-shaped, and a cavity adapted to the impact column is opened in the grate I. The impact column passes through the gas supply hole, and a spring II is fixedly connected to the end of the impact column facing the transmission rod.

[0009] Preferably, one side of the bottom of the furnace body can be opened, the air inlet is connected to the gas supply device, one end of the gasification chamber is provided with an arc-shaped groove, one end of the grate I near the arc-shaped groove is fixedly connected with an extension block, one end of the extension block is in contact with the arc-shaped groove, and the end of the extension block in contact with the arc-shaped groove is in the shape of an arc.

[0010] Preferably, the rotating holes and reciprocating grooves are staggered, the diameter of the central roller I is matched with the diameter of the rotating holes, the height of the reciprocating groove is the same as the diameter of the central roller II, and the length of the reciprocating groove is greater than the length of the central roller II.

[0011] Preferably, both grate I and grate II are inclined upwards, and grate I and grate II have the same structure.

[0012] Preferably, the diameter of the central roller I is matched with the diameter of the through hole, and the end of the grate I away from the through hole is triangular with an arc-shaped hypotenuse.

[0013] The present invention has the following beneficial effects:

[0014] 1. This invention uses a hydraulic rod to drive the central roller II to move back and forth in a reciprocating groove. This causes the grate II on the central roller II to push the surrounding material, loosening it and preventing it from slagging on the grate, which would block the gas outlet or cause poor slag removal. Simultaneously, the protrusions I and II on the central roller II cause friction and vibration with the grate I on the adjacent central roller I, causing both grate I and grate II to shake. This shaking and pushing causes relative displacement of the material, creating changes in the voids. This allows the gasifying agent to pass through these voids, preventing material accumulation. Material in the middle that cannot receive the gasifying agent or only receives a small amount of gas will have low heat output per unit time, insufficient to support subsequent gasification. At the same time, it allows the combustion gases and water vapor to flow quickly through the voids, accelerating subsequent gasification efficiency.

[0015] 2. This invention uses a motor to drive the central roller I to rotate, thereby causing the grate I to rotate synchronously. This opens the closed grate layer, allowing the ash and slag on the grate layer to fall rapidly to the bottom of the furnace under the rotation of grate I and the reciprocating push of grate II, completing an automatic and rapid slag removal operation. Then, the motor drives the central roller I to rotate back, causing grate I and grate II to close again to form an integral grate layer. At this time, grate I will squeeze the material still on grate II, causing the material to break down and form a granular layer. This allows the material to form larger pores at the joint of grate I and grate II in a short time, preventing the waste from breaking and blocking the gas supply holes during the slag removal process, which would reduce the amount of gasifying agent input, reduce the heat output per unit time, and fail to support subsequent gasification.

[0016] 3. When the crushed material creates a gap at the joint of grate I and grate II, the friction increases due to the influence of the granular material, which intensifies the shaking effect of grate I and grate II. When grate I and grate II are not in contact and the protrusions I and II cannot perform shaking, the shaking energy provided by the crushed material compensates for this and still achieves a continuous shaking effect.

[0017] 3. In this invention, during the reciprocating motion of grate I and grate II, the transmission rod in the sliding cavity is compressed and moves upward, compressing spring I. This causes the transmission rod to stretch and pull the impact column, compressing and storing energy in spring II. When grate I and grate II separate during the shaking process, spring I pushes the transmission rod downward, loosening the pull rope. This allows spring II to push the impact column to quickly strike the blockage material in the gas delivery hole. The material breaks and loosens under multiple impacts, thus clearing the blockage in the gas delivery hole. This avoids the problem of insufficient gasifying agent input and poor gasification effect caused by the blockage of the gas delivery hole. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the furnace body structure of the present invention;

[0020] Figure 3 This is a schematic diagram showing the structural distribution of grate I and grate II in this invention;

[0021] Figure 4 This is a schematic diagram of the grate I structure of the present invention;

[0022] Figure 5 This is a schematic diagram of the gas delivery port structure of the present invention;

[0023] Figure 6 This is a schematic diagram of the sliding cavity structure of the present invention;

[0024] Figure 7 This is a schematic diagram of the impact column structure of the present invention;

[0025] Figure 8 For the present invention Figure 6 Enlarged schematic diagram of a portion of the structure at point A;

[0026] Figure 9 For the present invention Figure 7 Enlarged schematic diagram of the structure at point B in the middle;

[0027] In the diagram: 1. Furnace body; 2. Gasification chamber; 3. Air inlet; 4. Rotating hole; 5. Reciprocating groove; 6. Arc groove; 7. Center roller I; 8. Limiting block; 9. Motor; 10. Center roller II; 11. Extension block; 12. Hydraulic cylinder; 13. Hydraulic rod; 14. Grate I; 140. Grate II; 141. Protrusion I; 142. Protrusion II; 15. Through hole; 16. Movable groove; 17. Gas distribution chamber; 18. Gas delivery hole; 19. Sliding chamber; 20. Spring I; 21. Transmission rod; 22. Pull rope; 23. Impact column; 24. Spring II. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figures 1 to 3 A reciprocating grate gasifier includes a furnace body 1, with a gasification chamber 2 inside the furnace body 1. One side of the bottom of the furnace body 1 is openable for easy removal of waste material. Air inlets 3 are located at both ends of the bottom of the furnace body 1, connected to a gas supply device, allowing air to enter the gasification chamber 2 through the air inlets 3, providing conditions for incomplete combustion of the material. The inner walls at both ends of the gasification chamber 2 have evenly distributed rotating holes 4 and reciprocating grooves 5, which are staggered, causing the central rollers I 7 and II 10 to be staggered. This ensures that all grates I 140 move synchronously during the reciprocating motion of the grate II 140. A central roller I 7 is movably sleeved within the rotating hole 4, the diameter of which is matched to the diameter of the rotating hole 4, allowing the central roller I 7 to move synchronously. The core roller I7 can only rotate. A central roller II10 is movably sleeved in the reciprocating groove 5. The height of the reciprocating groove 5 is the same as the diameter of the central roller II10, and the length of the reciprocating groove 5 is greater than the length of the central roller II10, so that the central roller II10 can reciprocate in the reciprocating groove 5. An arc-shaped groove 6 is opened at one end of the gasification chamber 2. One end of the extension block 11 is in contact with the arc-shaped groove 6, so that when the grate I14 near the arc-shaped groove 6 is not rotating to discharge material, the extension block 11 can prevent the material from falling. When the grate I14 is rotating slightly, the extension block 11 can rotate in contact with the arc-shaped groove 6 to prevent the material from falling prematurely. Only when the grate I14 is rotating significantly to discharge material will the extension block 11 disengage from the arc-shaped groove 6 to discharge material normally.

[0030] See Figure 1 , Figure 3 A hydraulic cylinder 12 is fixedly connected to one end of the furnace body 1. A hydraulic rod 13 is installed inside the hydraulic cylinder 12. The hydraulic rod 13 passes through the gasification chamber 2 and is fixedly connected to the bottom end of the central roller II 10. When the hydraulic cylinder 12 is started, the hydraulic rod 13 can reciprocate, and the central roller II 10 can reciprocate synchronously in the reciprocating groove 5 under the drive of the hydraulic rod 13, so that the grate II 140 on it can reciprocate. A uniformly distributed motor 9 is fixedly connected to one end of the furnace body 1. The output end of the motor 9 is fixedly connected to one end of the central roller I 7. When it is necessary to discharge waste, the motor 9 can start the central roller I 7 to drive the grate I 14 to rotate, thereby increasing the gap between the grate I 14 and the grate II 140, so that the waste residue can be discharged quickly.

[0031] See Figures 3 to 5Both center roller I7 and center roller II10 are fixedly connected with evenly distributed limiting blocks 8. Evenly distributed grates I14 are movably sleeved on center roller I7. An extension block 11 is fixedly connected to one end of grate I14 near the arc groove 6. The end of the extension block 11 that fits into the arc groove 6 is in an arc shape. Evenly distributed grates II140 are movably sleeved on center roller II10. Grate I14 and grate II140 fit together to form a grate layer. Both grate I14 and grate II140 are inclined upwards, so that the material on them can roll in an inclined downwards direction under their own weight. The grate I 14 and grate II 140 have the same structure. Grate I 14 has a through hole 15, and the diameter of the center roller I 7 matches the diameter of the through hole 15. The end of grate I 14 away from the through hole 15 is triangular, and the inclined side is arc-shaped. When grate II 140 reciprocates, the material can move upward relative to the material along the arc-shaped inclined side when pushed, which can minimize hard damage and avoid excessive material crushing and accumulation in the pushing direction, thus reducing the risk of excessive material crushing. To address the issue of air blockage caused by air entering the gas inlet 18, a movable groove 16 is provided on the inner wall of the through hole 15. A limiting block 8 is located within the movable groove 16, and the arc length of the movable groove 16 is greater than the arc length of the limiting block 8, allowing both grate I 14 and grate II 140 to reciprocate within a certain space. A protrusion I 141 is located at the center of the top of grate I 14, and a protrusion II 142 is located on the bottom end of grate I 14 away from the through hole 15. The protrusion I 141 on grate I 14 fits against the protrusion II 142 on grate II 140, allowing grate II 14... During the reciprocating motion, the protrusions I141 and II142 on the grate I14 at the contact point generate extrusion friction with the protrusions II142 and I141 on the grate I14 at the contact point. This causes the grate I14 and grate II140 to move up and down relative to each other under the pressure. This causes the material on the grate layer to change its voids during the shaking, so that various gases and heat can flow rapidly in the changing voids. This avoids the problem of low combustion efficiency, low pyrolysis efficiency, and low gasification efficiency caused by the accumulation of material, which results in less gas and heat received by the material in the middle per unit time.

[0032] See Figures 5 to 9The bottom end of grate I 14 is provided with a gas distribution chamber 17, and one arc-shaped end of grate I 14 is provided with evenly distributed gas delivery holes 18. One end of the gas delivery holes 18 is connected to the gas distribution chamber 17, and the gas delivery holes 18 are inclined downwards towards the gas distribution chamber 17, so that air can be delivered to the material above the grate layer through the gas distribution chamber 17 and the gas delivery holes 18. At the same time, the blockage material in the gas delivery holes 18 can move obliquely downwards and disengage from the gas delivery holes under the movement of grate I 14 and grate II 140. The grate I 14 is provided with Evenly distributed sliding cavities 19 are located on both sides of the gas inlet 18. The bottom opening of the sliding cavity 19 is located at the part of the protrusion II 142. A spring I 20 is fixedly connected to the top of the sliding cavity 19, and a transmission rod 21 is fixedly connected to the bottom of the spring I 20. The transmission rod 21 protrudes from the bottom opening of the sliding cavity 19. A pull rope 22 is fixedly connected to one end of the transmission rod 21, and an impact column 23 is fixedly connected to one end of the pull rope 22. The impact column 23 is T-shaped. The grate I 14 has openings that are... The impact column 23 has a cavity that matches the gas inlet 18. A spring 24 is fixedly connected to one end of the impact column 23 opposite the transmission rod 21. When the grate I 14 and grate II 140 come into contact during their reciprocating motion, the bottom end of the transmission rod 21 is compressed, causing it to move upwards and compressing the spring I 20. This causes the transmission rod 21 to pull the impact column 23 via the pull rope 22, compressing and storing energy in the spring II 24. Then, when the grate I 14 and grate II 140 come into contact... When the transmission rod 21 separates during the reciprocating motion, the bottom end of the transmission rod 21 loses its compression, causing the spring I 20 to push the transmission rod 21 down, which loosens the pull rope 22. This causes the spring II 24 to push the impact column 23 into the air outlet 18, causing the impact column 23 to continuously impact the air outlet 18. This causes the waste residue in the air outlet 18 to break and deform during the impact, loosening the waste material blocking the air outlet 18. The waste material then falls towards the air distribution chamber 17 during the inclined air outlet and the reciprocating motion, thus clearing the air outlet 18.

[0033] The method of using (working principle) of this invention is as follows:

[0034] First, the material is fed into the gasification chamber 2 through the opening at the top of the furnace body 1, causing it to accumulate on the grate layer formed by grate I and grate II. Then, a gasifying agent (air with low oxygen content) is introduced into the bottom of the gasification chamber 2 through the air inlet 3. The air is then sprayed through the air distribution chamber 17 and the air delivery port 18 towards the oxidation zone at the bottom of the material. At this time, the ignition device ignites the material in the oxidation zone, causing incomplete combustion in an oxygen-deficient state. The generated heat and reducing gas flow upwards to the pyrolysis zone and drying zone. Simultaneously, the hydraulic cylinder 12 is activated, causing the hydraulic rod 13 to reciprocate, moving the central roller II 10 along the hydraulic rod. Driven by 13, it makes synchronous reciprocating motion in the reciprocating groove 5, causing the grate II 140 on it to reciprocate. This causes the end of grate II 140 to push the surrounding material. At the same time, the protrusions I 141 and II 142 on it generate squeezing friction with the protrusions II 142 and I 141 on the grate I 14 at the contact point. This causes grate I 14 and grate II 140 to move up and down relative to each other under the squeezing, causing the material on the grate layer to change the gap during the shaking. At this time, the limiting block 8 reciprocates in the movable groove 16, limiting the range of up and down reciprocating motion of grate I 14 and grate II 140.

[0035] Then, when grate I 14 and grate II 140 come together in reciprocating motion, the bottom end of drive rod 21 is compressed, causing drive rod 21 to move upward, compressing spring I 20. This causes drive rod 21 to pull impact column 23 via pull rope 22, compressing and storing energy in spring II 24. Next, when grate I 14 and grate II 140 separate in reciprocating motion, the bottom end of drive rod 21 loses compression, causing spring I 20 to push drive rod 21 downward, loosening pull rope 22. This causes spring II 24 to push impact column 23 into gas inlet 18. Then, during material combustion, some waste... As the slag gradually moves, it enters the air inlet 18. Then, when slag discharge is required, the motor 9 drives the grate 14 to rotate upward through the central roller 17 and the limiting block 8, causing the slag to fall from the opening of the grate 14 and grate 2140 to the bottom of the grate layer. Then, the motor 9 reverses, causing the grate 14 to rotate and reset, pressing against the grate 2140, causing the slag on the grate 2140 to be crushed by compression. At this time, the grate 14 and grate 2140 cannot be completely closed for a short time. The crushed slag acts as an obstacle, allowing air to be transported from the gap between the grate 14 and grate 2140 to the material above the grate layer.

[0036] Finally, grate II 140 continues its reciprocating motion, causing grate I 14 to vibrate under the influence of irregularly broken waste residue, further crushing the waste residue. Meanwhile, transmission rod 21 repeats the above actions, causing impact column 23 to continuously impact the gas outlet 18, causing the waste residue inside the gas outlet 18 to break and deform during the impact, loosening the waste material blocking the gas outlet 18, and falling towards the gas distribution chamber 17 in the direction of the inclined gas outlet and reciprocating motion, thus clearing the gas outlet 18. Then, the waste material between grate I 14 and grate II 140 gradually breaks down and rolls down towards the bottom of the gasification chamber 2 during the movement of the grate. Then, the above actions are repeated to continuously gasify the material.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A reciprocating grate gasifier, comprising a furnace body (1), characterized in that: The furnace body (1) has a gasification chamber (2) inside. The inner walls of both ends of the gasification chamber (2) have evenly distributed rotating holes (4) and reciprocating grooves (5). A central roller I (7) is movably sleeved in the rotating hole (4), and a central roller II (10) is movably sleeved in the reciprocating groove (5). A hydraulic cylinder (12) is fixedly connected to one end of the furnace body (1). A hydraulic rod (13) is provided inside the hydraulic cylinder (12). The hydraulic rod (13) passes through the gasification chamber (2) and is fixedly connected to the bottom end of the central roller II (10). Evenly distributed limiting blocks (8) are fixedly connected to both the central roller I (7) and the central roller II (10). Evenly distributed grate I (14) is movably sleeved on the central roller I (7). A uniformly distributed grate II (140) is movably sleeved on the center roller II (10). The grate I (14) and grate II (140) have the same structure. A through hole (15) is opened on the grate I (14). A movable groove (16) is opened on the inner wall of the through hole (15). The limiting block (8) is located in the movable groove (16). The arc length of the movable groove (16) is greater than the arc length of the limiting block (8). A protrusion I (141) is provided at the middle of the top of the grate I (14). A protrusion II (142) is provided on the side of the bottom of the grate I (14) away from the through hole (15). The protrusion I (141) on the grate I (14) fits against the protrusion II (142) on the grate II (140). The bottom end of the grate I (14) is provided with a gas distribution chamber (17), and the end of the grate I (14) away from the through hole (15) is provided with evenly distributed gas delivery holes (18). One end of the gas delivery hole (18) is connected to the gas distribution chamber (17), and the gas delivery hole (18) is inclined downward towards the gas distribution chamber (17). The grate I (14) has evenly distributed sliding cavities (19) inside. The sliding cavities (19) are located on both sides of the gas supply hole (18). The bottom opening of the sliding cavity (19) is located at the part of the protrusion II (142). The top of the sliding cavity (19) is fixedly connected to the spring I (20). The bottom of the spring I (20) is fixedly connected to the transmission rod (21). The transmission rod (21) protrudes out of the bottom opening of the sliding cavity (19). One end of the transmission rod (21) is fixedly connected to a pull rope (22), and one end of the pull rope (22) is fixedly connected to an impact column (23). The impact column (23) is T-shaped. A cavity adapted to the impact column (23) is opened in the grate I (14). The impact column (23) penetrates into the gas supply hole (18). A spring II (24) is fixedly connected to one end of the impact column (23) facing the transmission rod (21). The bottom of the furnace body (1) is provided with air inlet holes (3) at both ends. The air inlet holes (3) are connected to the gas supply device. One end of the gasification chamber (2) is provided with an arc groove (6). One end of the grate I (14) near the arc groove (6) is fixedly connected with an extension block (11). One end of the extension block (11) is in contact with the arc groove (6). The end of the extension block (11) in contact with the arc groove (6) is in an arc shape. The rotating hole (4) and the reciprocating groove (5) are staggered. The diameter of the center roller I (7) is matched with the diameter of the rotating hole (4). The height of the reciprocating groove (5) is the same as the diameter of the center roller II (10). The length of the reciprocating groove (5) is greater than the length of the center roller II (10).

2. The reciprocating grate gasifier according to claim 1, characterized in that: One end of the furnace body (1) is fixedly connected to a uniformly distributed motor (9), the output end of the motor (9) is fixedly connected to one end of the central roller I (7), and one side of the bottom of the furnace body (1) can be opened.

3. The reciprocating grate gasifier according to claim 1, characterized in that: Both grate I (14) and grate II (140) are inclined upwards. Grate I (14) and grate II (140) are attached to form a grate layer. The gasification chamber (2) is located above the grate layer and is equipped with an ignition device.

4. A reciprocating grate gasifier according to claim 1, characterized in that: The diameter of the central roller I (7) is matched with the diameter of the through hole (15). The end of the grate I (14) away from the through hole (15) is triangular and the hypotenuse is arc-shaped.

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