Biomass gas generation system

Abstract

The present application relates to biomass processing equipment technical field, specifically for a kind of biomass gas generation system, including downdraft gasifier and the sealing top cover being arranged at its top, further include: rotation is installed on the sealing top cover and extends into the guide material elbow pipe of downdraft gasifier inside;Rotation is installed on the bottom end of the guide material elbow pipe installation sleeve shell, the inside fixed mounting of the installation sleeve shell is equipped with a plurality of material dropping holes on the material dropping seat;The installation sleeve shell is provided with corresponding material dropping hole position on the material dropping seat top material mechanism and material dropping seat cover mechanism.The present application is driven installation sleeve shell by guide material elbow pipe in downdraft gasifier inside rotation and drives material dropping seat top material mechanism, and biomass fuel is extruded into group in material dropping hole, and biomass fuel is discharged in group, fundamentally eliminates the longitudinal stratification phenomenon of different fuel components due to the different natural falling speed of light and heavy, dry and wet, ensures that the material composition and density of entering gasification reaction layer are uniform.

Description

Technical Field

[0001] This invention relates to the field of biomass processing equipment technology, specifically a biomass gas generation system. Background Technology

[0002] Biomass energy, as a renewable and carbon-neutral clean energy source, plays a vital role in optimizing the energy structure and reducing environmental pollution through its efficient utilization. Biomass pyrolysis gasification technology is one of the key methods for converting solid biomass fuel into high-quality combustible gas. Among these technologies, downdraft fixed-bed gasifiers are widely used in small- to medium-scale applications due to their relatively simple structure, ease of operation, and low tar content in the produced gas.

[0003] In existing technologies, downdraft gasifiers are typically equipped with a top-mounted feeding mechanism. Biomass fuel is fed into the furnace through this mechanism and undergoes drying, pyrolysis, oxidation, and reduction stages in sequence during its downward movement, ultimately transforming into combustible gas. However, this technology exhibits certain limitations when processing actual biomass fuels with complex compositions.

[0004] Specifically, many common biomass fuels, such as crop residues, are not homogeneous in physical form, typically containing both denser, more compact straw and looser, less dense leaf parts. To improve gasification reactivity, the fuel entering the furnace usually needs to retain a certain moisture content. Under these conditions, the weight of the moist straw segments is significantly greater than that of the leaves. When this mixed fuel enters the furnace through the feeding mechanism, the heavier straw segments fall faster under gravity, often reaching the lower and middle parts of the furnace first; while the lighter leaves fall more slowly, tending to accumulate in the upper and middle parts of the furnace. This stratified structure leads to the upper leaves excessively consuming heat from the rising airflow for moisture evaporation during gasification, forming a thermal shield that severely hinders the effective transfer of heat to the lower and middle straw layers, resulting in slow and incomplete straw pyrolysis. This ultimately leads to low overall biomass fuel conversion efficiency and a decrease in combustible gas yield and quality. Therefore, we propose a biomass gasification system to address these problems. Summary of the Invention

[0005] The purpose of this invention is to provide a biomass gas generation system to overcome the above-mentioned shortcomings of the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a biomass gasification system, comprising a downdraft gasifier and a sealed top cover disposed on its top, and further comprising:

[0007] Rotary installation of the guide pipe on the sealed top cover and extending into the interior of the downward suction gasifier;

[0008] The mounting sleeve is rotatably installed at the bottom end of the guide bend. A clump discharge seat is fixedly installed inside the mounting sleeve, and the clump discharge seat is provided with multiple discharge holes.

[0009] The mounting sleeve is provided with a pelletizing and top-feeding mechanism and a pelletizing and shielding mechanism corresponding to the position of the discharge hole. The pelletizing and top-feeding mechanism is used to compress the biomass fuel into pellets in the discharge hole, and the pelletizing and shielding mechanism is used to control the opening and closing of the bottom of the discharge hole.

[0010] The guide pipe is driven to rotate and revolve inside the downward suction gasifier. When the installation shell rotates, it drives the agglomeration and top material mechanism to squeeze the biomass fuel entering the discharge hole. When the agglomeration and top material mechanism moves to half of the total stroke, it drives the agglomeration and shielding mechanism to open the bottom of the discharge hole.

[0011] Preferably, the revolution and rotation of the mounting shell are achieved by a transmission mechanism, which includes a transmission gear ring disposed outside the mounting shell and an auxiliary gear ring fixed to the inner wall of the downward suction gasifier, and the transmission gear ring and the auxiliary gear ring mesh with each other.

[0012] Preferably, the agglomeration and top material mechanism includes a reciprocating screw, which is rotatably mounted on the mounting housing and driven to rotate by the rotation of the mounting housing; a transmission bushing, which is located outside the reciprocating screw and is driven to move up and down reciprocally by the reciprocating screw; and an agglomeration top rod, which is fixedly connected to the transmission bushing and extends into the interior of the mounting housing.

[0013] Preferably, a transmission gear disc is fixedly mounted on the outer end of the guide tube near the mounting sleeve, and a transmission gear is fixedly mounted on the top end of the reciprocating screw, wherein the transmission gear meshes with the transmission gear disc.

[0014] Preferably, the cross-section of the part where the agglomerating top rod mates with the mounting sleeve is polygonal, the bottom end of the agglomerating top rod is conical, and its size is adapted to the material discharge hole.

[0015] Preferably, the agglomeration and top material mechanism further includes an extrusion rod, which is linked with the agglomeration top rod and is used to drive the agglomeration and top material mechanism to move when it moves downward.

[0016] Preferably, the agglomeration and shielding mechanism includes a mounting base, which is fixedly mounted on the mounting housing; a transmission screw, which is helically mounted in the mounting base; and a shielding frame, which is rotatably mounted on the bottom end of the mounting base and is connected to the transmission screw in a transmission manner; when the transmission screw is pressed down, it drives the shielding frame to deflect.

[0017] Preferably, one end of the material shielding frame covers the bottom end of the material discharge hole, and the other end is provided with a positioning slider. The transmission screw is provided with a positioning groove that cooperates with the positioning slider.

[0018] Preferably, the discharge hole on the agglomeration discharge seat is arranged around the center position of the bottom end of the guide bend, and the agglomeration discharge seat is provided with a guide slope to guide the biomass fuel to the discharge hole.

[0019] Preferably, the downdraft gasifier is provided with an expansion section that mates with the mounting sleeve, and a grate is provided on the lower inner side of the downdraft gasifier; the material discharge range of the plurality of material discharge holes on the mounting sleeve is adapted to the grate on the lower inner side of the downdraft gasifier.

[0020] In the above technical solution, the beneficial effects of the present invention are as follows: the guide pipe drives the installation sleeve to rotate inside the downdraft gasifier and drives the agglomerating top material mechanism to compress biomass fuel into agglomerates in the material drop holes, and the biomass fuel is fed in agglomerates, which fundamentally eliminates the longitudinal stratification phenomenon caused by the different natural falling speeds of fuel components of different weights and dryness, and ensures that the material composition and density entering the gasification reaction layer are uniform; at the same time, the installation sleeve can simultaneously revolve and rotate inside the downdraft gasifier, thereby ensuring that the agglomerates of fuel falling along multiple material drop holes can be relatively evenly spread on the grate, improving the drying efficiency and gasification effect of biomass fuel.

[0021] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit this disclosure.

[0022] This application provides an overview of various implementations or examples of the technology described in this disclosure, and is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention after assembly;

[0025] Figure 2 This is a schematic diagram highlighting the installation positions of the material guide bend and the mounting sleeve related structures of this invention;

[0026] Figure 3 This is a schematic diagram highlighting the external structure of the material guide bend and the mounting sleeve of this invention;

[0027] Figure 4 This invention is illustrated by a schematic diagram showing the structure of the agglomeration top material mechanism and the agglomeration drop seat working together.

[0028] Figure 5 This invention is presented in a schematic diagram illustrating the structure of the agglomeration and top feeding mechanism.

[0029] Figure 6 This invention is illustrated by a schematic diagram showing the cooperation between the agglomeration top material mechanism and the agglomeration shielding mechanism.

[0030] Figure 7 This is a schematic diagram illustrating the structure of the agglomeration and shielding mechanism when it is driven to operate.

[0031] Figure 8 This is a schematic diagram of the partially exploded structure of the agglomeration and shielding mechanism of the present invention;

[0032] Figure 9 This is a top view of the structure of the present invention, showing the installation of the casing in conjunction with the downward suction gasifier.

[0033] Explanation of reference numerals in the attached figures:

[0034] In the diagram: 1. Downdraft gasifier; 2. Sealed top cover; 3. Guide bend; 4. Mounting sleeve; 5. Agglomerating material drop seat; 6. Material drop hole; 7. Guide slope; 8. Agglomerating material ejection mechanism; 81. Mounting arm; 82. Reciprocating screw; 83. Transmission bushing; 84. Transmission gear; 85. Agglomerating ejector rod; 86. Extrusion rod; 9. Agglomerating material shielding mechanism; 91. Mounting seat; 92. Transmission screw; 93. Return spring; 94. Material shielding frame; 95. Positioning slide groove; 96. Positioning slider; 10. Transmission gear disc; 11. Transmission gear ring; 12. Auxiliary gear ring; 13. Drive motor. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0036] Please see Figure 1-9 This invention provides a technical solution: a biomass gasification system, including a downdraft gasifier 1 and a sealed top cover 2 disposed on its top, and further comprising:

[0037] Rotary installation of the guide pipe 3 on the sealed top cover 2 and extending into the interior of the downward suction gasifier 1;

[0038] Rotate the mounting sleeve 4 at the bottom of the guide bend 3. The mounting sleeve 4 has a fixedly installed agglomerated material drop seat 5 inside, and the agglomerated material drop seat 5 is provided with multiple material drop holes 6.

[0039] The mounting sleeve 4 is equipped with a pelletizing and top-feeding mechanism 8 and a pelletizing and shielding mechanism 9 corresponding to the position of the discharge hole 6. The pelletizing and top-feeding mechanism 8 is used to compress biomass fuel into pellets in the discharge hole 6, and the pelletizing and shielding mechanism 9 is used to control the opening and closing of the bottom end of the discharge hole 6.

[0040] The guide pipe 3 is driven to rotate the mounting sleeve 4 inside the downward suction gasifier 1. When the mounting sleeve 4 rotates, it drives the agglomeration top material mechanism 8 to squeeze the biomass fuel entering the drop hole 6. When the agglomeration top material mechanism 8 moves to half of the total stroke, it drives the agglomeration shielding mechanism 9 to open the bottom of the drop hole 6.

[0041] Specifically, biomass fuel is fed along the feed bend 3; after entering the feed bend 3, the fuel is guided by the guide slope 7 into each discharge hole 6; the feed bend 3 is driven to rotate the entire mounting sleeve 4 around the central axis of the downdraft gasifier 1 inside the downdraft gasifier 1; during the rotation, the mounting sleeve 4 rotates synchronously through the transmission gear ring 11 and the auxiliary gear ring 12, and during the rotation, the mounting sleeve 4 synchronously drives several agglomeration top feeding mechanisms 8 to act, and the agglomeration top feeding mechanisms 8 compress the biomass fuel entering the discharge holes 6 into agglomerates. When the agglomeration top feeding mechanism 8 initially acts, the bottom of the discharge hole 6 is blocked by the agglomeration shielding mechanism 9, which meets the need for compressing the biomass fuel inside the discharge hole 6. When the top feeding mechanism 8 completes half of its total stroke, it activates the top feeding mechanism 8 to drive the top feeding and blocking mechanism 9, releasing the blockage of the bottom of the discharge hole 6 by the top feeding and blocking mechanism 9. When the top feeding mechanism 8 completes three-quarters of its total stroke, the bottom of the discharge hole 6 is fully open. When the top feeding mechanism 8 completes its total stroke, it pushes the biomass fuel that has been compressed into clumps inside the discharge hole 6 away from the discharge hole 6, allowing the biomass fuel to be discharged in clumps. This fundamentally eliminates the longitudinal stratification phenomenon caused by the different natural falling speeds of fuel components of different weights and dryness. The mounting sleeve 4 rotates synchronously within the downward suction gasifier 1 while revolving around it, so that the clumps of fuel falling along the multiple discharge holes 6 are relatively evenly spread on the grate.

[0042] Compared with the prior art, the present invention uses the guide pipe 3 to drive the mounting sleeve 4 to rotate inside the downdraft gasifier 1 and drive the agglomerating top material mechanism 8 to compress biomass fuel into agglomerates in the discharge holes 6, and to discharge biomass fuel in agglomerates. This fundamentally eliminates the longitudinal stratification phenomenon caused by the different natural falling speeds of fuel components of different weights and moisture levels, ensuring that the material composition and density entering the gasification reaction layer are uniform. At the same time, the mounting sleeve 4 can simultaneously revolve and rotate inside the downdraft gasifier 1, thereby ensuring that the agglomerates of fuel falling along the multiple discharge holes 6 can be relatively evenly spread on the grate, improving the drying efficiency and gasification effect of biomass fuel.

[0043] As a preferred technical solution in this embodiment, the revolution and rotation of the mounting sleeve 4 are achieved through a transmission mechanism. The transmission mechanism includes a transmission gear ring 11 disposed outside the mounting sleeve 4 and an auxiliary gear ring 12 fixed to the inner wall of the downward suction gasifier 1. The transmission gear ring 11 and the auxiliary gear ring 12 mesh with each other. Specifically, the transmission gear ring 11 has a clearance groove that cooperates with the extrusion rod 86. A drive motor 13 is fixedly installed on the top of the sealing top cover 2, and the drive motor 13 is connected to the guide pipe 3 through a transmission connection. The transmission between the three parts is via gears, belts, or chains and sprockets; the drive motor 13 drives the guide pipe 3 to rotate, thereby enabling the entire mounting sleeve 4 to revolve around the central axis of the down-draft gasifier 1 inside the down-draft gasifier 1. The transmission gear ring 11 on the outside of the mounting sleeve 4 and the auxiliary gear ring 12 on the inner wall of the down-draft gasifier 1 cooperate to drive the entire mounting sleeve 4 to rotate, thereby enabling the clumps of fuel falling along the multiple dropping holes 6 to be relatively evenly spread on the grate inside the down-draft gasifier 1.

[0044] In another embodiment of the present invention, the agglomeration and top feeding mechanism 8 includes a reciprocating screw 82, which is rotatably mounted on the mounting housing 4 and driven to rotate by the rotation of the mounting housing 4; a transmission bushing 83, which is disposed outside the reciprocating screw 82 and driven to move back and forth up and down by the reciprocating screw 82; and an agglomeration top rod 85, which is fixedly connected to the transmission bushing 83 and extends into the interior of the mounting housing 4. Specifically, the agglomeration and top feeding mechanism 8 also includes a mounting arm 81, which is fixedly mounted on the top of the mounting housing 4, and the reciprocating screw 82 is rotatably mounted on the mounting arm 81 in a vertical state; when the reciprocating screw 82 is driven to rotate, it can drive the transmission bushing 83 to move back and forth up and down. The working principle of the reciprocating screw 82 and the transmission bushing 83 is common existing technology and will not be described in detail here. The agglomerating top rod 85 is fitted outside the reciprocating screw 82 and its top end is fixedly connected to the transmission bushing 83. When the transmission bushing 83 is driven by the reciprocating screw 82 to move up and down, it can synchronously drive the agglomerating top rod 85 to move, thereby realizing the extrusion of the biomass fuel inside the discharge hole 6 by the agglomerating top rod 85. It should be noted that the extrusion in this application does not compress the biomass fuel into a dense block, but only compresses the biomass fuel entering the discharge hole 6 into a clump to meet the combination of straw and leaf parts in the biomass fuel and avoid stratification during discharge.

[0045] As a preferred technical solution in this embodiment, a transmission gear disk 10 is fixedly mounted on the outer end of the guide tube 3 near the mounting sleeve 4, and a transmission gear 84 is fixedly mounted on the top end of the reciprocating screw 82. The transmission gear 84 meshes with the transmission gear disk 10. Specifically, when the mounting sleeve 4 rotates, it drives the agglomerating and feeding mechanism 8 to move synchronously, thereby enabling several agglomerating and feeding mechanisms 8 to rotate around the transmission gear disk 10. Through the cooperation of the transmission gear disk 10 and the transmission gear 84, the reciprocating screw 82 can be driven to rotate, providing power for the extrusion and agglomeration of biomass fuel inside the discharge hole 6. It should be noted that, in order to prevent the mounting sleeve 4 from falling along several discharge holes 6 during revolution... The clumps of biomass fuel are too concentrated. In the initial state, there can be a height difference between the transmission bushings 83 in several clumping and feeding mechanisms 8, that is, a height difference between the clumping and feeding rods 85 in several clumping and feeding mechanisms 8. This ensures that the biomass fuel clumps are always falling when the mounting shell 4 revolves, instead of the biomass fuel clumps falling in one place when the mounting shell 4 revolves. This achieves uniform spreading of the clumps of biomass fuel on the grate. It should also be noted that the module and diameter of the transmission gear disk 10 are 3-8 times that of the transmission gear 84, so as to ensure that the biomass fuel clumps fall at the included angle between adjacent feeding holes 6 for every rotation of the mounting shell 4.

[0046] As a preferred technical solution in this embodiment, the cross-section of the part where the agglomerating top rod 85 mates with the mounting sleeve 4 is polygonal, and the bottom end of the agglomerating top rod 85 is conical, with dimensions adapted to the discharge hole 6. Specifically, to limit the axial rotation of the transmission bushing 83, the cross-section of the part where the agglomerating top rod 85 mates with the mounting sleeve 4 is set as polygonal, ensuring that the reciprocating screw 82 can drive the transmission bushing 83 to move stably up and down when rotating. The upper half of the discharge hole 6 is connected to the guide slope 7 in a flared shape, and the lower half is a straight section. The conical shape at the bottom end of the agglomerating top rod 85 is adapted to the straight section of the lower half of the discharge hole 6. When the agglomerating top rod 85 is driven to move downward, the agglomeration of biomass fuel is mainly completed in the straight section of the discharge hole 6.

[0047] As a preferred technical solution in this embodiment, the agglomeration and top feeding mechanism 8 also includes an extrusion rod 86, which is linked with the agglomeration top rod 85 and is used to drive the agglomeration and shielding mechanism 9 to move when it moves downward. Specifically, the extrusion rod 86 is fixedly connected to the agglomeration top rod 85. By setting the extrusion rod 86 to link the agglomeration and shielding mechanism 9 with the agglomeration and top feeding mechanism 8, when the agglomeration top rod 85 moves down to about half of the total stroke, the extrusion rod 86 opens the top pressure transmission screw 92 to move downward, and drives the shielding frame 94 to deflect through the transmission screw 92, thereby releasing the blockage on the bottom end of the discharge hole 6. When the agglomeration top rod 85 moves down to about three-quarters of the total stroke, the bottom end of the discharge hole 6 is fully open. When the agglomeration top rod 85 moves down completely, it pushes the agglomerated biomass fuel inside the discharge hole 6 away from the discharge hole 6.

[0048] In another embodiment of the present invention, the agglomeration and shielding mechanism 9 includes a mounting base 91, which is fixedly mounted on the mounting sleeve 4; a transmission screw 92, which is helically mounted in the mounting base 91; and a shielding frame 94, which is rotatably mounted on the bottom end of the mounting base 91 and is connected to the transmission screw 92 in a transmission connection. When the transmission screw 92 is pressed down, it drives the shielding frame 94 to deflect. Specifically, when the transmission screw 92 is pressed down by the extrusion rod 86, since the transmission screw 92 and the mounting base 91 are helically connected, the transmission screw 92 moves axially inside the mounting base 91. Simultaneously, the screw rotates, causing the transmission screw 92 to drive the material shield 94 to deflect, thus controlling the opening and closing of the bottom end of the material drop hole 6. The transmission screw 92 is externally fitted with a return spring 93 located above the mounting base 91, which is used to drive the transmission screw 92 and the material shield 94 to return to their original positions. It should be noted that the pitch between the transmission screw 92 and the mounting base 91 is such that when the transmission screw 92 moves one-quarter of the total stroke of the top rod 85, the material shield 94 can change from completely covering the bottom end of the material drop hole 6 to completely opening the bottom end of the material drop hole 6.

[0049] As a preferred technical solution in this embodiment, one end of the material shielding frame 94 covers the bottom end of the material drop hole 6, and the other end is provided with a positioning slider 96. The transmission screw 92 is provided with a positioning groove 95 that cooperates with the positioning slider 96. Specifically, by setting the positioning groove 95 and the positioning slider 96 that cooperate with each other, the transmission screw 92 can be axially moved under pressure, and the transmission screw 92 can drive the material shielding frame 94 to deflect when it rotates, thereby realizing the control of the opening and closing state of the bottom end of the material drop hole 6 by the material shielding frame 94.

[0050] As a preferred technical solution in this embodiment, the dropping holes 6 on the agglomerating dropping seat 5 are arranged around the center position of the bottom end of the guide bend 3. The agglomerating dropping seat 5 is provided with a guide slope 7 to guide the biomass fuel to the dropping holes 6. Specifically, when the biomass fuel enters the installation sleeve 4 along the bottom end of the guide bend 3, the biomass fuel is guided to the dropping hole 6 by the guide slope 7, which meets the need for the biomass fuel to move into the dropping hole 6. At the same time, the biomass fuel can fall relatively evenly into several dropping holes 6, thereby ensuring that the biomass fuel in several dropping holes 6 is compressed relatively evenly.

[0051] As a preferred technical solution in this embodiment, the downdraft gasifier 1 is provided with an expansion section that cooperates with the mounting sleeve 4, and a grate is provided on the lower inner side of the downdraft gasifier 1; the material discharge range of the plurality of material discharge holes 6 on the mounting sleeve 4 is adapted to the grate on the lower inner side of the downdraft gasifier 1. It should be noted that, since the material discharge holes 6 are a certain distance from the edge of the mounting sleeve 4, if the upper and lower parts of the downdraft gasifier 1 have the same diameter, the material discharge range of the plurality of material discharge holes 6 on the mounting sleeve 4 is difficult to cover the edge and center area of ​​the grate. Therefore, the mounting area of ​​the downdraft gasifier 1 used to install the mounting sleeve 4 is expanded so that when the mounting sleeve 4 revolves and rotates inside the downdraft gasifier 1, the material discharge range of the plurality of material discharge holes 6 on the mounting sleeve 4 can completely cover the grate.

[0052] All electrical components involved in this application are existing technologies. Those skilled in the art can select appropriate models of electrical components according to their needs. No restrictions or elaborations are made here. Those skilled in the art understand their connection methods. With the help of those skilled in the art, all electrical components in this application and their compatible power supplies can be connected by wires. And according to the actual situation, appropriate controllers can be selected to meet control requirements.

[0053] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A biomass gasification system, comprising a downdraft gasifier (1) and a sealed top cover (2) disposed on its top, characterized in that, Also includes: Rotary installation of the material guide bend (3) on the sealed top cover (2) and extending into the bottom suction gasifier (1); Rotate the mounting sleeve (4) installed at the bottom of the guide tube (3). The mounting sleeve (4) has a fixedly installed a pelletizing material drop seat (5), and the pelletizing material drop seat (5) is provided with multiple dropping holes (6). The mounting sleeve (4) is provided with a clumping and top material mechanism (8) and a clumping and shielding mechanism (9) corresponding to the position of the material drop hole (6). The clumping and top material mechanism (8) is used to compress biomass fuel into clumps in the material drop hole (6), and the clumping and shielding mechanism (9) is used to control the opening and closing of the bottom end of the material drop hole (6). The guide pipe (3) is driven to rotate and revolve inside the down-draft gasifier (1) by the mounting sleeve (4). When the mounting sleeve (4) rotates, it drives the agglomeration top material mechanism (8) to squeeze the biomass fuel entering the drop hole (6). When the agglomeration top material mechanism (8) moves to half of the total stroke, it drives the agglomeration shielding mechanism (9) to open the bottom of the drop hole (6).

2. The biomass gasification system according to claim 1, characterized in that, The revolution and rotation of the mounting shell (4) are achieved by a transmission mechanism, which includes a transmission gear ring (11) located outside the mounting shell (4) and an auxiliary gear ring (12) fixed to the inner wall of the downward suction gasifier (1). The transmission gear ring (11) and the auxiliary gear ring (12) mesh with each other.

3. The biomass gasification system according to claim 1, characterized in that, The agglomeration top material mechanism (8) includes a reciprocating screw (82), which is rotatably mounted on the mounting sleeve (4) and driven to rotate by the rotation of the mounting sleeve (4); a transmission bushing (83), which is located outside the reciprocating screw (82) and is driven to move up and down reciprocally by the reciprocating screw (82); and an agglomeration top rod (85), which is fixedly connected to the transmission bushing (83) and extends into the interior of the mounting sleeve (4).

4. A biomass gasification system according to claim 3, characterized in that, The guide tube (3) is fixedly fitted with a transmission gear disk (10) at one end near the mounting sleeve (4), and a transmission gear (84) is fixedly fitted at the top of the reciprocating screw (82). The transmission gear (84) meshes with the transmission gear disk (10).

5. A biomass gasification system according to claim 3, characterized in that, The cross-section of the part where the agglomerating top rod (85) and the mounting sleeve (4) meet is polygonal, and the bottom end of the agglomerating top rod (85) is conical, and its size is adapted to the material drop hole (6).

6. A biomass gasification system according to claim 3, characterized in that, The agglomeration top material mechanism (8) also includes an extrusion rod (86), which is linked with the agglomeration top rod (85) and is used to drive the agglomeration shielding mechanism (9) to move when it moves downward.

7. A biomass gasification system according to claim 1, characterized in that, The agglomeration and shielding mechanism (9) includes a mounting base (91), which is fixedly installed on the mounting sleeve (4); a transmission screw (92), which is spirally installed in the mounting base (91); and a shielding frame (94), which is rotatably installed at the bottom of the mounting base (91) and is connected to the transmission screw (92) for transmission. When the transmission screw (92) is pressed down, it drives the shielding frame (94) to deflect.

8. A biomass gasification system according to claim 7, characterized in that, One end of the material shield (94) covers the bottom end of the material drop hole (6), and the other end is provided with a positioning slider (96). The transmission screw (92) is provided with a positioning groove (95) that cooperates with the positioning slider (96).

9. A biomass gasification system according to claim 1, characterized in that, The dropping hole (6) on the agglomeration dropping seat (5) is set around the center position of the bottom end of the guide bend (3), and the agglomeration dropping seat (5) is provided with a guide slope (7) to guide biomass fuel to the dropping hole (6).

10. A biomass gasification system according to claim 1, characterized in that, The downdraft gasifier (1) is provided with an expansion section that cooperates with the mounting sleeve (4), and a grate is provided on the lower inner side of the downdraft gasifier (1); the material dropping range of several material dropping holes (6) on the mounting sleeve (4) is adapted to the grate on the lower inner side of the downdraft gasifier (1).

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