Low-tar biomass gasifier and use method thereof

Abstract

The invention belongs to the technical field of biomass gasification furnaces, and discloses a low-tar biomass gasification furnace and a use method thereof, the low-tar biomass gasification furnace comprises a gasification furnace body; the feeding mechanism is arranged at the top of the right side of the gasifier body; the material guide pipe is arranged on the right side in the gasification furnace body. According to the technical scheme, the movable plate, the spraying pipe head and the valve clack are arranged, after biomass in the material storage net cylinder is combusted and gasified, the biomass can upwards pass through the filtering medium, the filtering medium can adsorb tar in gas, then air pressure can push the movable plate to ascend, and the biomass can be sprayed out through the spraying pipe head. Then, a movable plate pushes gas in a first pneumatic piston cylinder to be guided into the top of a piston plate through a vent groove, the piston plate is pushed downwards, so that liquid in a liquid storage box is sprayed downwards through a spraying pipe head, and at the moment, the movable plate moves upwards to enable the spraying pipe head to push a valve clack to be opened; finally, the spraying pipe head sprays a catalyst to the tar in the filtering medium, so that the tar is pyrolyzed, gasified and discharged, and the tar content is greatly reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of biomass gasifiers, and in particular relates to a low-tar biomass gasifier and a use method thereof. Background Art

[0002] Biomass gasifier is a gasification equipment for producing straw gas (green new energy). It converts biomass raw materials into combustible gases such as CO, H2 and CH4 through high-temperature cracking and gasification processes. This gas can be used in many fields such as power generation, heating, and production of chemicals.

[0003] When the existing biomass gasifier burns biomass, a large amount of tar will be produced while the biomass produces gas, which will not only greatly reduce the gasification efficiency of the biomass, but also reduce the quality of the output gas. Summary of the invention

[0004] In order to solve the problems raised in the above background technology, the present invention provides a low-tar biomass gasifier and a method for using the same, which has the advantage of reducing the tar output of biomass.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a low-tar biomass gasifier, comprising a gasifier body; a feeding mechanism, arranged at the top right side of the gasifier body; a material guide pipe, arranged at the right side inside the gasifier body; a tar removal mechanism comprising a filter medium, the filter medium is fixedly installed in the middle of the inner cavity of the gasifier body, the inner cavity of the gasifier body is movably installed with a movable plate located on the top of the filter medium, a liquid storage box is fixedly installed on the inner wall of the top of the gasifier body, the bottom of the liquid storage box is fixedly connected to a spray pipe head, a valve disc located directly below the spray pipe head is arranged inside the movable plate, first pneumatic components are arranged on both sides of the inside of the liquid storage box, and the bottom of the rear end of the liquid storage box is fixedly connected to a liquid infusion pipe, and the rear end of the liquid infusion pipe runs through the gasifier body.

[0006] Preferably, the first pneumatic assembly comprises a first pneumatic piston cylinder, a venting groove and a piston plate;

[0007] The first pneumatic piston cylinder is fixedly installed on both sides of the inner cavity of the liquid storage box, the ventilation groove is opened on the top of the gasification furnace body and the inner side of the top of the first pneumatic piston cylinder, and the piston plate is movably installed on the top of the inner cavity of the liquid storage box.

[0008] Preferably, a rotating mechanism is provided at the bottom of the inner cavity of the gasifier body, and the rotating mechanism includes a material storage net cylinder, a connecting rod and a first spring;

[0009] The material storage net tube is movably installed at the bottom of the inner cavity of the gasifier body, the connecting rod is fixedly installed at the middle of the bottom end of the material storage net tube, and the first spring is fixedly installed between the right rear of the bottom end of the connecting rod and the inner wall of the gasifier body.

[0010] Preferably, a linkage assembly is provided in the middle of the top of the gasifier body, and the linkage assembly includes a linkage piston cylinder, a first connecting pipe and an arc-shaped piston cylinder;

[0011] The linkage piston cylinder is fixedly installed in the middle of the top of the gasifier body, the arc piston cylinder is fixedly installed inside the gasifier body and in front of the right side of the connecting rod, the first connecting pipe is fixedly connected between the left side of the front end of the arc piston cylinder and the bottom of the front end of the linkage piston cylinder, and the bottom end of the linkage piston cylinder is fixedly connected to the top of the piston plate.

[0012] Preferably, the left side of the gasification furnace body is fixedly connected with an exhaust pipe and a liquid discharge pipe located at the upper left of the filter medium and the lower left of the material storage mesh cylinder respectively.

[0013] Preferably, the inner wall of the bottom end of the gasifier body is fixedly mounted on a heating plate outside the connecting rod.

[0014] Preferably, a driving assembly is provided on the top of the material storage mesh cylinder, and the driving assembly includes a lifting mesh plate and a shielding plate;

[0015] The lifting mesh plate is movably mounted on the inner wall of the material storage mesh cylinder, and the shielding plate is fixedly mounted on the right side of the top of the lifting mesh plate and the left inner wall of the material guide tube.

[0016] Preferably, a material blocking assembly is provided inside the gasification furnace body and is located on the right side of the bottom of the material guide pipe, and the material blocking assembly includes a material blocking plate and a second spring;

[0017] The blocking plate is movably installed inside the gasifier body and on the right side of the bottom of the material guide pipe, and the second spring is fixedly installed between the middle part of the right side of the blocking plate and the inner wall of the gasifier body.

[0018] Preferably, a second pneumatic assembly located on the right side of the material blocking plate is provided on the right side of the gasifier body, and the second pneumatic assembly includes a driving piston cylinder, a second pneumatic piston cylinder and a second connecting pipe;

[0019] The driving piston cylinder is fixedly installed on the right side of the gasifier body and the front and rear of the right side of the blocking plate. The left side of the driving piston cylinder is fixedly connected to the right end of the blocking plate. The second pneumatic piston cylinder is fixedly installed inside the gasifier body and above the baffle plate, and the bottom end is fixedly connected to the top of the baffle plate. The second connecting pipe is fixedly connected between the front and rear of the top of the second pneumatic piston cylinder and the inner side of the right end of the driving piston cylinder.

[0020] A method for using a biomass gasifier is applied to a low-tar biomass gasifier, and the steps of use are as follows:

[0021] S1: First, the biomass is transported to the material guide pipe through the feeding mechanism, and then enters the material storage net tube until it is full, which can push the lifting net plate and the shielding plate upward, so that the second pneumatic piston cylinder allows the internal gas to enter the driving piston cylinder through the second connecting pipe and push the blocking plate to the left to block the bottom of the material guide pipe;

[0022] S2: Start the heating plate to heat and burn the biomass in the storage net cylinder to gasify it, and the gas passes through the filter medium to absorb the internal tar;

[0023] S3: The air pressure at the bottom of the movable plate pushes it upward, so that the first pneumatic piston cylinder guides the internal gas to the top of the piston plate through the ventilation groove, so as to smoothly push the catalyst in the liquid storage tank downward and spray out through the spray pipe head;

[0024] S4: When the movable plate is upward, the valve flap at the bottom of the spray pipe head will be opened, so that the catalyst in the spray pipe head will smoothly fall and spray into the filter medium, catalytically cracking the tar, and the generated gas and biomass gasification gas will be discharged and collected from the exhaust pipe;

[0025] S5: When the piston plate moves downward, the gas in the linkage piston cylinder is introduced into the arc-shaped piston cylinder through the first connecting pipe to push the connecting rod and the material storage net cylinder to deflect, so that the biomass in the material storage net cylinder is evenly heated for gasification.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The above technical solution is provided with a movable plate, a spray pipe head and a valve disc. When the biomass in the storage mesh cylinder is burned and gasified, it will pass through the filter medium upward, and the filter medium will adsorb the tar in the gas. Then the air pressure will push the movable plate up, and then the movable plate will push the gas in the first pneumatic piston cylinder to be introduced into the top of the piston plate through the ventilation groove, pushing the piston plate downward, so that the liquid in the liquid storage tank is sprayed downward through the spray pipe head. At this time, since the movable plate is upward, the top movable valve disc of the spray pipe head will be opened, and finally the spray pipe head will spray the catalyst on the tar in the filter medium, so that the tar is catalytically cracked and gasified and discharged, which greatly reduces the tar content.

[0028] The present invention provides a material storage mesh cylinder, a linkage piston cylinder and a first connecting pipe. When the piston plate moves downward, the gas in the inner cavity of the linkage piston cylinder is introduced into the interior of the arc-shaped piston cylinder through the first connecting pipe, so that the output shaft of the arc-shaped piston cylinder pushes the connecting rod and the material storage mesh cylinder to deflect. When the piston plate returns to its original position, the elastic force of the first spring is released to push the connecting rod and the material storage mesh cylinder to return to its original position. Finally, the material storage mesh cylinder and the connecting rod rotate back and forth, so that the biomass in the material storage mesh cylinder is shaken and heated evenly and comprehensively, thereby greatly improving the gasification efficiency.

[0029] The present invention provides a blocking plate, a second spring and a driving piston cylinder. When the biomass enters the material storage mesh cylinder through the feeding mechanism and the material guide pipe, it will slowly accumulate in the material storage mesh cylinder, so that the lifting mesh plate and the shielding plate are upward, until the material storage mesh cylinder is full. At this time, the shielding plate will push all the gas in the second pneumatic piston cylinder to enter the driving piston cylinder through the second connecting pipe, so that the output end of the driving piston cylinder can smoothly push the blocking plate to the left to block the bottom of the material guide pipe and prevent gas from entering. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of the present invention;

[0031] Figure 2 It is a cross-sectional structural schematic diagram of the present invention;

[0032] Figure 3 for Figure 2 A schematic diagram of the local enlarged structure at point A in the middle;

[0033] Figure 4 It is a schematic cross-sectional structural diagram of the side of the present invention;

[0034] Figure 5 for Figure 4 A schematic diagram of the local enlarged structure at B in the middle;

[0035] Figure 6 is a schematic cross-sectional structural diagram of the first spring of the present invention;

[0036] Figure 7 It is a schematic cross-sectional structural diagram of the material blocking plate of the present invention;

[0037] Figure 8 It is a schematic cross-sectional structural diagram of the second pneumatic component of the present invention.

[0038] In the figure: 1, gasifier body; 2, feeding mechanism; 3, material guide pipe; 4, tar removal mechanism; 401, filter medium; 402, movable plate; 403, liquid storage box; 404, spray pipe head; 405, valve disc; 5, first pneumatic assembly; 501, first pneumatic piston cylinder; 502, ventilation groove; 503, piston plate; 6, rotating mechanism; 601, material storage net cylinder; 602, connecting rod; 603, first spring; 7, linkage assembly; 70 1. Linked piston cylinder; 702. First connecting pipe; 703. Arc piston cylinder; 8. Exhaust pipe; 9. Drain pipe; 10. Infusion tube; 11. Driving assembly; 1101. Lifting mesh plate; 1102. Shielding plate; 12. Blocking assembly; 1201. Blocking plate; 1202. Second spring; 13. Second pneumatic assembly; 1301. Driving piston cylinder; 1302. Second pneumatic piston cylinder; 1303. Second connecting pipe; 14. Heating plate. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] like Figures 1 to 8 As shown, the present invention provides a low-tar biomass gasifier, including a gasifier body 1; a feeding mechanism 2, which is arranged at the top right side of the gasifier body 1; a material guide pipe 3, which is arranged on the right side inside the gasifier body 1; a tar removal mechanism 4 includes a filter medium 401, the filter medium 401 is fixedly installed in the middle of the inner cavity of the gasifier body 1, and the inner cavity of the gasifier body 1 is movably installed with a movable plate 402 located at the top of the filter medium 401, a liquid storage box 403 is fixedly installed on the inner wall of the top of the gasifier body 1, and a spray pipe head 404 is fixedly connected to the bottom of the liquid storage box 403, and a valve flap 405 located directly below the spray pipe head 404 is arranged inside the movable plate 402, and first pneumatic components 5 are arranged on both sides of the liquid storage box 403, and a liquid infusion pipe 10 is fixedly connected to the bottom of the rear end of the liquid storage box 403, and the rear end of the liquid infusion pipe 10 runs through the gasifier body 1.

[0041] When the gas produced by biomass combustion passes through the filter medium 401, the filter medium 401 will block part of the tar, and then the air pressure will push the movable plate 402 upward, so that the first pneumatic component 5 pushes the catalyst in the liquid storage box 403 to spray downward through the spray pipe head 404, and finally the catalyst is sprayed onto the tar in the filter medium 401 for cracking treatment.

[0042] like Figure 2 As shown, the first pneumatic assembly 5 includes a first pneumatic piston cylinder 501, a venting groove 502 and a piston plate 503;

[0043] The first pneumatic piston cylinder 501 is fixedly installed on both sides of the inner cavity of the liquid storage box 403, the ventilation groove 502 is opened on the top of the gasification furnace body 1 and the inner side of the top of the first pneumatic piston cylinder 501, and the piston plate 503 is movably installed on the top of the inner cavity of the liquid storage box 403.

[0044] The above scheme is adopted: by providing a first pneumatic piston cylinder 501, when the movable plate 402 is upward, the output end of the first pneumatic piston cylinder 501 will be pushed to retract into the inner cavity of the first pneumatic piston cylinder 501, so that the gas in the first pneumatic piston cylinder 501 can be introduced into the top of the piston plate 503 through the ventilation groove 502, thereby pushing the piston plate 503 to move downward as a whole.

[0045] like Figure 3 and Figure 6As shown, a rotating mechanism 6 is provided at the bottom of the inner cavity of the gasifier body 1, and the rotating mechanism 6 includes a material storage net cylinder 601, a connecting rod 602 and a first spring 603;

[0046] The material storage net tube 601 is movably installed at the bottom of the inner cavity of the gasifier body 1, the connecting rod 602 is fixedly installed in the middle of the bottom end of the material storage net tube 601, and the first spring 603 is fixedly installed between the right rear of the bottom end of the connecting rod 602 and the inner wall of the gasifier body 1.

[0047] By adopting the above solution, the first spring 603 is provided, and due to the elastic force of the first spring 603, the connecting rod 602 and the material storage net cylinder 601 can be smoothly pushed to deflect and reset as a whole.

[0048] like Figure 4 and Figure 6 As shown, a linkage assembly 7 is provided in the middle of the top of the gasification furnace body 1, and the linkage assembly 7 includes a linkage piston cylinder 701, a first connecting pipe 702 and an arc-shaped piston cylinder 703;

[0049] The linkage piston cylinder 701 is fixedly installed in the middle of the top of the gasifier body 1, the arc piston cylinder 703 is fixedly installed inside the gasifier body 1 and in front of the right side of the connecting rod 602, the first connecting pipe 702 is fixedly connected between the left side of the front end of the arc piston cylinder 703 and the bottom of the front end of the linkage piston cylinder 701, and the bottom end of the linkage piston cylinder 701 is fixedly connected to the top of the piston plate 503.

[0050] By adopting the above solution, the linkage piston cylinder 701 is provided, and when the piston plate 503 moves downward, the gas in the linkage piston cylinder 701 can be pushed through the first connecting pipe 702 and introduced into the interior of the arc-shaped piston cylinder 703 .

[0051] like Figure 2 As shown, the left side of the gasifier body 1 is fixedly connected with an exhaust pipe 8 and a liquid discharge pipe 9 located at the upper left of the filter medium 401 and the lower left of the material storage net cylinder 601 respectively.

[0052] With the above solution, when the movable plate 402 is facing upward, the gas pressure generated by the biomass gasification will be discharged through the exhaust pipe 8 for collection and treatment.

[0053] like Figure 2 As shown, the inner wall of the bottom end of the gasifier body 1 is fixedly mounted on the heating plate 14 outside the connecting rod 602 .

[0054] By adopting the above solution, the heating plate 14 is provided, and the operator can heat, burn and gasify the biomass in the material storage net cylinder 601 by starting the heating plate 14 .

[0055] like Figure 3 and Figure 4As shown, a driving assembly 11 is disposed on the top of the material storage net cylinder 601, and the driving assembly 11 includes a lifting net plate 1101 and a shielding plate 1102;

[0056] The lifting mesh plate 1101 is movably installed on the inner wall of the material storage mesh tube 601, and the shielding plate 1102 is fixedly installed on the top right side of the lifting mesh plate 1101 and the left inner wall of the material guide tube 3.

[0057] By adopting the above solution, when the biomass enters the material storage net cylinder 601 through the material guide pipe 3 and is slowly filled up, the lifting net plate 1101 and the shielding plate 1102 can be pushed upward as a whole.

[0058] like Figure 3 and Figure 8 As shown, a material blocking assembly 12 is provided inside the gasification furnace body 1 and is located at the right side of the bottom of the material guide pipe 3. The material blocking assembly 12 includes a material blocking plate 1201 and a second spring 1202;

[0059] The blocking plate 1201 is movably installed inside the gasifier body 1 and on the right side of the bottom of the material guide pipe 3 , and the second spring 1202 is fixedly installed between the middle of the right side of the blocking plate 1201 and the inner wall of the gasifier body 1 .

[0060] The above solution is adopted: by providing the second spring 1202, due to the pulling force of the second spring 1202, the blocking plate 1201 can be pulled to the left as a whole, thereby releasing the blocking of the bottom of the material guide tube 3.

[0061] like Figure 8 As shown, a second pneumatic assembly 13 is disposed on the right side of the gasifier body 1 and is located on the right side of the material blocking plate 1201. The second pneumatic assembly 13 includes a driving piston cylinder 1301, a second pneumatic piston cylinder 1302 and a second connecting pipe 1303;

[0062] The driving piston cylinder 1301 is fixedly installed on the right side of the gasifier body 1 and the front and rear of the right side of the blocking plate 1201. The left side of the driving piston cylinder 1301 is fixedly connected to the right end of the blocking plate 1201. The second pneumatic piston cylinder 1302 is fixedly installed inside the gasifier body 1 and above the baffle plate 1102, and the bottom end is fixedly connected to the top of the baffle plate 1102. The second connecting pipe 1303 is fixedly connected between the front and rear of the top of the second pneumatic piston cylinder 1302 and the inner side of the right end of the driving piston cylinder 1301.

[0063] The above solution is adopted: by providing a second pneumatic piston cylinder 1302, when the baffle plate 1102 is upward, the gas in the inner cavity of the second pneumatic piston cylinder 1302 can be pushed through the second connecting pipe 1303 and introduced into the driving piston cylinder 1301, so as to push the blocking plate 1201 to move to the left.

[0064] The working principle and use process of the present invention:

[0065] First, the operator can load the biomass into the guide pipe 3 through the loading mechanism 2, and then after it enters the storage mesh cylinder 601, the biomass will slowly accumulate in the storage mesh cylinder 601, so that the lifting mesh plate 1101 and the baffle plate 1102 are pushed upward, and then the baffle plate 1102 will push all the gas in the second pneumatic piston cylinder 1302 through the second connecting pipe 1303 to enter the inside of the driving piston cylinder 1301, so that the driving piston cylinder 1301 pushes the blocking plate 1201 to the left to block the bottom of the guide pipe 3, stop loading, and then start the heating plate 14 to heat and burn the biomass in the storage mesh cylinder 601.

[0066] Afterwards, after the biomass in the storage mesh tube 601 is burned and gasified, the gas will pass upward through the filter medium 401, and the filter medium 401 can absorb the tar in the gas. The gas gradually increases, which will cause the air pressure to push the movable plate 402 to move upward, and then the gas in the first pneumatic piston cylinder 501 can be pushed to be introduced into the top of the piston plate 503 through the ventilation groove 502, so that the air pressure pushes the piston plate 503 downward as a whole, and then the liquid in the liquid storage box 403 can be squeezed and pushed to be sprayed downward through the spray pipe head 404. Finally, the catalyst spray pipe head 404 sprays the catalyst on the tar in the filter medium 401, so that the tar is catalytically cracked and gasified, and the gas discharged along with the biomass gasification is collected through the exhaust pipe 8.

[0067] Then, when the piston plate 503 moves downward, the gas in the inner cavity of the linkage piston cylinder 701 will be introduced into the interior of the arc piston cylinder 703 through the first connecting pipe 702, so that the arc piston cylinder 703 pushes the connecting rod 602 and the material storage net cylinder 601 to deflect, and when the elastic force of the first spring 603 is released, the connecting rod 602 and the material storage net cylinder 601 will be pushed to return to rotation. Finally, the material storage net cylinder 601 and the connecting rod 602 rotate back and forth, so that the biomass in the material storage net cylinder 601 is evenly heated, and the catalyst liquid dripping in the filter medium 401 is thrown off and discharged through the drain pipe 9.

[0068] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0069] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-tar biomass gasifier, characterized in that: It comprises a gasifier body (1); A feeding mechanism (2) is arranged on the top right side of the gasification furnace body (1); A material guide pipe (3) is arranged on the right side inside the gasification furnace body (1); The tar removal mechanism (4) comprises a filter medium (401), the filter medium (401) is fixedly installed in the middle of the inner cavity of the gasifier body (1), the inner cavity of the gasifier body (1) is movably installed with a movable plate (402) located at the top of the filter medium (401), a liquid storage box (403) is fixedly installed on the inner wall of the top of the gasifier body (1), the bottom of the liquid storage box (403) is fixedly connected to a spray pipe head (404), a valve flap (405) located directly below the spray pipe head (404) is arranged inside the movable plate (402), first pneumatic components (5) are arranged on both sides of the liquid storage box (403), the bottom of the rear end of the liquid storage box (403) is fixedly connected to a liquid infusion pipe (10), and the rear end of the liquid infusion pipe (10) passes through the gasifier body (1).

2. The low-tar biomass gasifier according to claim 1, characterized in that: The first pneumatic assembly (5) comprises a first pneumatic piston cylinder (501), a venting groove (502) and a piston plate (503); The first pneumatic piston cylinder (501) is fixedly installed on both sides of the inner cavity of the liquid storage box (403), the ventilation groove (502) is opened on the top of the gasification furnace body (1) and the inner side of the top of the first pneumatic piston cylinder (501), and the piston plate (503) is movably installed on the top of the inner cavity of the liquid storage box (403).

3. The low-tar biomass gasifier according to claim 1, characterized in that: A rotating mechanism (6) is provided at the bottom of the inner cavity of the gasifier body (1), and the rotating mechanism (6) comprises a material storage net cylinder (601), a connecting rod (602) and a first spring (603); The material storage mesh cylinder (601) is movably installed at the bottom of the inner cavity of the gasifier body (1), the connecting rod (602) is fixedly installed at the middle of the bottom end of the material storage mesh cylinder (601), and the first spring (603) is fixedly installed between the right rear of the bottom end of the connecting rod (602) and the inner wall of the gasifier body (1).

4. The low-tar biomass gasifier according to claim 1, characterized in that: A linkage assembly (7) is provided in the middle of the top of the gasification furnace body (1), and the linkage assembly (7) comprises a linkage piston cylinder (701), a first connecting pipe (702) and an arc-shaped piston cylinder (703); The linkage piston cylinder (701) is fixedly installed in the middle of the top of the gasifier body (1), the arc-shaped piston cylinder (703) is fixedly installed inside the gasifier body (1) and in front of the right side of the connecting rod (602), the first connecting pipe (702) is fixedly connected between the left side of the front end of the arc-shaped piston cylinder (703) and the bottom of the front end of the linkage piston cylinder (701), and the bottom end of the linkage piston cylinder (701) is fixedly connected to the top of the piston plate (503).

5. The low-tar biomass gasifier according to claim 1, characterized in that: The left side of the gasification furnace body (1) is fixedly connected to an exhaust pipe (8) and a liquid discharge pipe (9) located at the upper left of the filter medium (401) and the lower left of the material storage net cylinder (601).

6. The low-tar biomass gasifier according to claim 1, characterized in that: The inner wall of the bottom end of the gasifier body (1) is fixedly mounted on a heating plate (14) outside the connecting rod (602).

7. The low-tar biomass gasifier according to claim 3, characterized in that: A driving assembly (11) is arranged on the top of the material storage mesh cylinder (601), and the driving assembly (11) comprises a lifting mesh plate (1101) and a shielding plate (1102); The lifting mesh plate (1101) is movably mounted on the inner wall of the material storage mesh cylinder (601), and the shielding plate (1102) is fixedly mounted on the right side of the top of the lifting mesh plate (1101) and the left inner wall of the material guide tube (3).

8. The low-tar biomass gasifier according to claim 1, characterized in that: A material blocking assembly (12) is provided inside the gasification furnace body (1) and is located on the right side of the bottom of the material guide pipe (3); the material blocking assembly (12) comprises a material blocking plate (1201) and a second spring (1202); The blocking plate (1201) is movably installed inside the gasifier body (1) and on the right side of the bottom of the material guide pipe (3), and the second spring (1202) is fixedly installed between the middle part of the right side of the blocking plate (1201) and the inner wall of the gasifier body (1).

9. The low-tar biomass gasifier according to claim 1, characterized in that: A second pneumatic assembly (13) is provided on the right side of the gasifier body (1) and is located on the right side of the material blocking plate (1201). The second pneumatic assembly (13) comprises a driving piston cylinder (1301), a second pneumatic piston cylinder (1302) and a second connecting pipe (1303); The driving piston cylinder (1301) is fixedly installed on the right side of the gasifier body (1) and the front and rear sides of the right side of the blocking plate (1201); the left side of the driving piston cylinder (1301) is fixedly connected to the right end of the blocking plate (1201); the second pneumatic piston cylinder (1302) is fixedly installed inside the gasifier body (1) and above the shielding plate (1102), and the bottom end is fixedly connected to the top of the shielding plate (1102); the second connecting pipe (1303) is fixedly connected between the front and rear sides of the top of the second pneumatic piston cylinder (1302) and the inner side of the right end of the driving piston cylinder (1301).

10. A method for using a biomass gasifier, applied to the low-tar biomass gasifier according to any one of claims 1 to 9, characterized in that: The steps used are as follows: S1: The biomass is first transported to the material guide pipe (3) through the feeding mechanism (2), and then enters the material storage mesh cylinder (601) to be filled, and the lifting mesh plate (1101) and the shielding plate (1102) are pushed upward, so that the second pneumatic piston cylinder (1302) allows the internal gas to enter the driving piston cylinder (1301) through the second connecting pipe (1303) to push the blocking plate (1201) to the left to block the bottom of the material guide pipe (3); S2: Start the heating plate (14) to heat and burn the biomass in the material storage net cylinder (601) to gasify it, and the gas passes through the filter medium (401) to absorb the tar inside; S3: The air pressure at the bottom of the movable plate (402) pushes it upward, so that the first pneumatic piston cylinder (501) guides the internal gas through the ventilation groove (502) to the top of the piston plate (503), so as to smoothly push the catalyst in the liquid storage box (403) downward and spray out through the spray pipe head (404); S4: When the movable plate (402) is upward, the valve flap (405) at the bottom of the spray pipe head (404) is turned open, so that the catalyst in the spray pipe head (404) smoothly falls and sprays into the filter medium (401), catalytically cracking the tar, and the generated gas and biomass gasification gas are discharged and collected from the exhaust pipe (8); S5: When the piston plate (503) moves downward, the gas in the linkage piston cylinder (701) is introduced into the arc-shaped piston cylinder (703) through the first connecting pipe (702), pushing the connecting rod (602) and the material storage net cylinder (601) to deflect, so that the biomass in the material storage net cylinder (601) is evenly heated and gasified.

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