Novel double-suction gasification furnace and double-suction gasification method

Abstract

The invention discloses a novel double-suction gasification furnace and a double-suction gasification method, and belongs to the technical field of agricultural machinery. The energy-saving and environment-friendly energy-saving furnace comprises a furnace body, a material pushing spiral device, a material throwing spiral device, an inclined sliding plate, a blowing pipe set, a fire grate, an upper exhaust hole, a lower exhaust hole, a buffer chamber and a gas collecting pipeline, the material pushing spiral device is arranged at a feeding port of the furnace body, and the material throwing spiral device is arranged on the portion, located on one side of the tail of the material pushing spiral device, of the furnace body; an inclined sliding plate and a blowing pipe set are arranged on the inner side wall, located below the material throwing spiral device, of the furnace body, a fire grate is arranged in the furnace body, an upper exhaust hole is formed in the side wall, located above the fire grate, of the furnace body, a lower exhaust hole is formed in the side wall, located below the fire grate, of the furnace body, a buffer chamber is arranged at an exhaust port of the furnace body, and the buffer chamber is connected with a gas collecting pipeline. The invention aims to solve the problems of too fast falling speed of biomass materials, insufficient combustion and low gas conversion rate of the existing gasification furnace, reduce the temperature of the output gas and improve the heat efficiency of the gasification furnace.

Description

Technical Field

[0001] The invention relates to a novel double-suction gasifier and a double-suction gasification method, belonging to the technical field of agricultural machinery. Background Art

[0002] Biomass refers to various organic organisms formed through photosynthesis, which convert solar energy into bioenergy and store CO2. Therefore, biomass energy is considered to be the only renewable carbon source. Biomass materials are typical carbon-neutral fuels, that is, raw materials that do not emit net greenhouse gases or produce carbon footprints. Compared with other renewable energy sources, biomass energy can not only provide electricity, but also provide a variety of industrial products such as high-value gas, biodiesel, high-quality chemicals, high-grade steam, biochar fertilizer raw materials, etc., serving people's livelihood, transportation, agriculture, industry, building heating and other fields, and occupying an important position in the future energy utilization field.

[0003] According to the relative direction of airflow and raw materials, fixed bed gasifiers can be divided into upper suction type, lower suction type, horizontal suction type and open-heart type, among which upper suction type and lower suction type are the most widely used. The application of furnace type needs to consider materials and uses. At present, the upper suction fixed bed gasifier on the market can process up to 8t / h of biomass per furnace, equipped with a 35t / h steam boiler, which is mainly used for factory heating. Upper suction fixed bed gasifiers use more wood biomass, and straw biomass needs to be pressed into blocks before entering the furnace. The upper suction fixed bed gasifier has a high adaptability to the moisture content of raw materials, which can reach 30%. The raw materials can be roughly crushed into 2-10cm blocks before entering the furnace for gasification. The outlet pyrolysis gas temperature of the upper suction fixed bed gasifier is the lowest, the tar content is the highest, and the dust content is the least. If the tar is not properly disposed of, it will cause greater environmental damage and energy waste. The upper suction fixed bed gasifier has the simplest structure, but occupies a slightly larger area and can operate within the design load range of 30-110%. The carbon content in the ash of the upward suction fixed bed gasifier can be adjusted to a lower value, so its carbon conversion rate and gasification efficiency are the highest.

[0004] However, the above-mentioned gasifiers all have the following problems:

[0005] 1. The biomass material falls too fast and burns incompletely.

[0006] 2. The biomass material is not in sufficient contact with the air, and the gas conversion rate is not high.

[0007] 3. The tar content in the pyrolysis gas of the currently used downdraft gasifier is low, but the ash content in the fuel gas is too high, while the tar content of the updraft gasifier is high.

[0008] Therefore, it is urgent to propose a new double-suction gasifier and a double-suction gasification method to solve the above technical problems. Summary of the invention

[0009] The purpose of the present invention is to solve the problems of excessively fast falling speed of biomass materials, incomplete combustion, and low gas conversion rate in existing gasifiers. A brief overview of the present invention is given below to provide a basic understanding of certain aspects of the present invention. It should be understood that this overview is not an exhaustive overview of the present invention. It is not intended to identify the key or important parts of the present invention, nor is it intended to limit the scope of the present invention.

[0010] The technical solution of the present invention:

[0011] A novel double-suction gasifier comprises a furnace body, a pushing screw device, a throwing screw device, an inclined slide plate, a blowing pipe group, a grate, an upper exhaust hole, a lower exhaust hole, a buffer chamber and an air collecting pipeline. A pushing screw device is arranged at the feed inlet of the furnace body, a throwing screw device is arranged on the furnace body on one side of the tail of the pushing screw device, an inclined slide plate and a blowing pipe group are arranged on the inner side wall of the furnace body below the throwing screw device, a grate is arranged in the furnace body, an upper exhaust hole is opened on the side wall of the furnace body above the grate, a lower exhaust hole is opened on the side wall of the furnace body below the grate, a buffer chamber is arranged at the exhaust port of the furnace body, and the buffer chamber is connected to the air collecting pipeline.

[0012] Preferably, there are multiple inclined slide plates, which are arranged on the inner wall of the furnace body in opposite directions and staggered on the left and right sides.

[0013] Preferably, the blow pipe group comprises an upper blow pipe and a lower blow pipe, and the upper blow pipe and the lower blow pipe are longitudinally arranged on the side wall of the furnace body in sequence.

[0014] Preferably, an ash conveying belt transmission device is arranged just below the grate at the bottom of the furnace body.

[0015] Preferably: heat conducting fins are arranged in the buffer chamber.

[0016] Preferably, the air collection pipeline is located on the side wall of the buffer chamber at the top of the heat conducting fins.

[0017] Preferably, a plurality of upper blowing pipes are provided, and the side protruding into the furnace body is arranged upward, and a plurality of lower blowing pipes are provided, and the side protruding into the furnace body is arranged downward.

[0018] Preferably, the material-throwing spiral device comprises a spiral shaft and material-throwing blades, the spiral shaft is provided with material-throwing blades, the spiral shaft is a hollow structure, and is provided with an air outlet connected to the outside.

[0019] It also includes a swirl wheel, which is rotatably installed at the lower part of the furnace body through a rotating shaft. A driving motor is fixedly installed on the furnace body, and the rotating shaft is connected to the output end of the driving motor through a chain transmission mechanism.

[0020] The double-suction gasification method of the novel double-suction gasifier comprises:

[0021] After the biomass material is fed into the furnace from the feed port, it is pushed into the furnace by the pushing screw device, and then thrown by the throwing screw device, so that the biomass material is evenly distributed in the combustion chamber in the furnace.

[0022] When the biomass material falls, it passes through the inclined slides arranged alternately in opposite directions, so that the biomass material slows down its falling speed during the falling process, thereby extending the residence time of the biomass material in the drying area and the cracking area in the furnace body.

[0023] An upper blow pipe and a lower blow pipe are installed at the throat of the oxidation zone in the furnace body. The upper blow pipe and the lower blow pipe spray air into the furnace body from the upper and lower sides, and together with the jet on the throwing spiral device, form an air intake mode combining upper and lower air intake and internal and external air intake, so that the biomass material is fully in contact with the air;

[0024] The flue gas generated by the combustion of the material enters the buffer chamber, exchanges heat with the heat-conducting fins in the buffer chamber, and then enters the air collection pipeline.

[0025] The present invention has the following beneficial effects:

[0026] 1. The present invention uses a throwing screw device to throw materials during feeding, so that the biomass materials are evenly distributed in the combustion chamber, thereby improving the gasification rate;

[0027] 2. The inclined slide plates of the present invention are installed alternately in opposite directions, so that the falling speed of the biomass materials is slowed down by the action of the inclined slide plates during the falling process, thereby improving the gasification rate;

[0028] 3. The present invention provides upper exhaust holes and lower exhaust holes on the upper and lower sides of the grate, respectively, so that the ash content in the flue gas generated after the combustion of the biomass material can be reduced, and the tar that has not yet cracked can continue to be thermally decomposed under the action of high-temperature ash, and heat transfer between the gas phase and the solid phase can still be carried out;

[0029] 4. The present invention has an air inlet hole on the spiral rotor shaft, and upward and downward blowing pipes are installed on both sides of the throat, respectively, to achieve an air intake mode combining upward and downward air intake and internal and external air intake, so that the material is fully in contact with the air and the gasification rate is improved;

[0030] 5. After exhausting the gas, the present invention does not directly collect the gas, but adds a buffer chamber, and installs a plurality of heat-conducting fins on the inner wall of the buffer chamber to increase the heat exchange area between the output gas and the buffer chamber, reduce the temperature of the output gas, and improve the thermal efficiency of the gasifier. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of a new type of double-suction gasifier;

[0032] Figure 2 It is a structural schematic diagram of a furnace body of the present invention;

[0033] Figure 3 is a top view of the inclined slide plate of the present invention;

[0034] Figure 4 is a front view of the inclined slide plate of the present invention;

[0035] Figure 5 is a top view of the cyclone wheel of the present invention;

[0036] Figure 6 It is a matching installation diagram of the spiral shaft of the present invention;

[0037] Figure 7 It is a structural schematic diagram of the spiral shaft of the present invention;

[0038] Figure 8 It is a structural schematic diagram of the spiral shaft and the rotary plug of the present invention.

[0039] In the figure, 1-furnace body, 2-pushing screw device, 3-throwing screw device, 4-inclined slide plate, 5-blowing pipe group, 6-grate, 7-upper exhaust hole, 8-lower exhaust hole, 9-buffer chamber, 10-air collection pipeline, 11-ash conveying belt transmission device, 12-heat conducting fins, 13-swirl wheel, 31-screw shaft, 32-throwing blades, 33-air outlet, 51-upper blowing pipe, 52-lower blowing pipe. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0041] The connection mentioned in the present invention is divided into fixed connection and detachable connection. The fixed connection is a non-detachable connection including but not limited to conventional fixed connection methods such as folding connection, rivet connection, bonding connection and welding connection. The detachable connection includes but not limited to conventional detachable methods such as threaded connection, snap connection, pin connection and hinge connection. When the specific connection method is not clearly defined, it is assumed that at least one connection method can always be found in the existing connection methods to achieve the function. Those skilled in the art can choose according to their needs. For example: a fixed connection is selected as a welding connection, and a detachable connection is selected as a hinge connection.

[0042] Specific implementation method 1: Combination Figure 1-Figure 8The present embodiment is described. A novel double-suction gasifier of the present embodiment comprises a furnace body 1, a pushing screw device 2, a throwing screw device 3, an inclined slide plate 4, a blowing pipe group 5, a grate 6, an upper exhaust hole 7, a lower exhaust hole 8, a buffer chamber 9 and an air collecting pipeline 10. The pushing screw device 2 is arranged at the feed inlet of the furnace body 1, the throwing screw device 3 is arranged on the furnace body 1 located on the tail side of the pushing screw device 2, the inclined slide plate 4 and the blowing pipe group 5 are arranged on the inner side wall of the furnace body 1 below the throwing screw device 3, the grate 6 is arranged in the furnace body 1, the upper exhaust hole 7 is opened on the side wall of the furnace body 1 above the grate 6, the lower exhaust hole 8 is opened on the side wall of the furnace body 1 located below the grate 6, and the buffer chamber 9 is arranged at the exhaust port of the furnace body 1, and the buffer chamber 9 is connected to the air collecting pipeline 10.

[0043] The furnace body 1 comprises an upper furnace body and a lower furnace body, wherein the upper furnace body and the lower furnace body are butt-jointed by stoppers and connected together by bolts, and the furnace body 1 comprises an inner shell and an outer shell, wherein an insulation layer is filled between the inner shell and the outer shell.

[0044] The biomass material undergoes a chemical reaction in the furnace body 1 , and there are four zones in the furnace body 1 , namely, a drying zone, a cracking zone, an oxidation zone and a reduction zone.

[0045] The push screw device 2 is welded by a spiral blade and a push shaft, powered by a motor, and fixed at the feed port of the furnace body 1 through a bracket with bolts.

[0046] The inclined slide plate 4 is processed into an arc shape with the same curvature as the inner tank of the furnace body 1. The inclined slide plate 4 is installed on the inner wall of the furnace body 1 through a support rod and is arranged in a spiral line on the inner tank. The normal installation angle is set to 30° with the horizontal. The angle can be adjusted according to the situation, and the adjustment range is 10° to 60°.

[0047] There are multiple inclined slide plates 4, which are arranged on the inner side wall of the furnace body 1 in a staggered manner in the left and right directions. In this embodiment, there are four inclined slide plates 4, and the biomass material is pushed into the furnace body 1 by the pushing screw device 2, and then thrown and dropped by the throwing screw device 3. When the biomass material falls, it passes through four inclined slide plates 4 that are alternately installed at an angle of 30 degrees, so that the biomass material slows down its falling speed through the action of the inclined slide plates 4 during the falling process, thereby improving the gasification rate.

[0048] The blow pipe group 5 includes an upper blow pipe 51 and a lower blow pipe 52, which are longitudinally arranged on the side wall of the furnace body 1 in sequence, and are connected to the furnace body 1 by screws using a fixing sleeve, and the upper blow pipe 51 and the lower blow pipe 52 are installed at an angle of 30° to the horizontal.

[0049] The grate 6 includes: ash discharge rods, ash discharge wheels and chain transmission mechanism, etc. The ash discharge wheel has 6 teeth with an angle of 60°. 30 ash discharge wheels are installed on one ash discharge rod, and the ash discharge wheels of two adjacent rods are staggered at an angle of 30 degrees. There are a total of 6 ash discharge rods, which are rotatably installed on the furnace frame. Each ash discharge rod has a sprocket at the end, which is connected by a chain transmission mechanism and powered by a motor.

[0050] An ash conveying belt transmission device 11 is arranged just below the grate 6 at the bottom of the furnace body 1. The ash conveying belt transmission device 11 includes: an ash conveying rod, a belt transmission mechanism and a support frame, etc. The ash conveying rod is installed on the support frame, connected to the motor by the belt transmission mechanism, and powered by the motor.

[0051] The buffer chamber 9 is provided with heat-conducting fins 12 which are processed into an arc shape and connected to the inner wall of the buffer chamber 9 with screws. There are 7 rows of heat-conducting fins 12, with 10 fins in each row.

[0052] The air collecting pipeline 10 is located on the side wall of the buffer chamber 9 at the top of the heat conducting fin 12, and a total of four air collecting pipes are installed.

[0053] There are multiple upper blowing pipes 51 , which are all arranged upward on one side extending into the furnace body 1 . There are multiple lower blowing pipes 52 , which are all arranged downward on one side extending into the furnace body 1 .

[0054] The throwing screw device 3 includes a screw shaft 31 and a throwing blade 32. The throwing blade 32 is arranged on the screw shaft 31. The screw shaft 31 is a hollow structure and is provided with an air outlet 33 connected to the outside. The throwing screw device 3 is powered by a motor, connected with a chain transmission mechanism, and connected to the motor as a whole. The motor is fixed on the bracket. When the screw shaft 31 rotates, it is connected to the air intake structure pipeline of an air pump, etc.

[0055] The top of the spiral shaft 31 is provided with a rotating plug through a bearing. Figure 7 and 8 As shown, the rotary plug is connected to an air pump or other equipment through an air intake structure pipeline, and the rest flows out from the air pump or other equipment, enters the interior of the spiral shaft 31 from the rotary plug through the pipeline, and is discharged from the air outlet 33.

[0056] The design of the air outlet 33 and the blowing pipe group 5 on the throwing screw device 3 realizes an air intake method that combines upper and lower air intake and internal and external air intake, so that the material is fully in contact with the air and the gasification rate is improved. After the gas is discharged, the gas is not directly collected, but a buffer chamber 9 is added, and a plurality of heat-conducting fins 12 are installed on the inner wall of the buffer chamber 9 to increase the heat exchange area between the output gas and the buffer chamber 9, reduce the temperature of the output gas, and improve the thermal efficiency of the gasifier.

[0057] It also includes a swirl wheel 13, which is rotatably mounted at the bottom of the furnace body 1 through a rotating shaft, and a driving motor is fixedly mounted on the furnace body 1;

[0058] The rotating shaft is connected to the output end of the driving motor through a chain transmission mechanism, and the chain transmission mechanism includes a driving sprocket, a driven sprocket and a transmission chain. The driving sprocket is installed on the output end of the driving motor or the motor, and the driven sprocket is installed on the bottom of the rotating shaft. The rotating shaft is coaxially arranged, and the driving sprocket and the driven sprocket are connected through a transmission chain.

[0059] The reaction generally occurring in the reduction zone below the throat of the furnace body 1 is a reduction reaction, and substances in three states of solid, liquid and gas exist.

[0060] The combustion products generated in the previous stage will react with the carbon to generate CO, and the water vapor released in the previous stage will react with the carbon to generate water gas (including H 2 and CO), the product H 2 It will react with carbon at high temperature to generate CH 4 , thus the solid biomass raw material can be transformed into gaseous fuel. The addition of the swirl wheel 13 can promote the complete solid-liquid-gas reaction in the reduction zone and increase the absorption of combustible gas.

[0061] The main reactions at this stage are:

[0062] C+H 2 O→CO+H 2

[0063] C+CO 2 →2CO

[0064] C+2H 2 →CH 4

[0065] 2H 2 O+C→CO 2 +2H 2

[0066] CH 4 +H 2 O→CO+3H 2

[0067] A double-suction gasification method of a novel double-suction gasifier in this embodiment includes:

[0068] After the biomass material is fed into the furnace body 1 through the feed port, it is pushed into the furnace body 1 by the pushing screw device 2 and then thrown by the throwing screw device 3 so that the biomass material is evenly distributed in the combustion chamber of the furnace body 1 .

[0069] When the biomass material falls, it passes through the inclined slide plates 4 arranged alternately in opposite directions, so that the biomass material slows down its falling speed during the falling process, prolonging the residence time of the biomass material in the drying zone and the cracking zone in the furnace body 1. The temperature in the drying zone is about 100-250°C. The wet material in the biomass material exchanges heat with the hot gas from below, and the evaporated water vapor becomes gas phase and enters the pyrolysis zone. In the cracking zone, the biomass material undergoes cracking reaction after being heated, and most of the volatile matter is separated from the solid. Cracking requires a lot of heat, and the temperature drops to 400-600°C.

[0070] The cracking reaction equation is:

[0071] CH 1.4 O 0.6 =0.64C+0.44H 2 +0.15H 2 O+0.17CO+0.13CO 2 +0.005CH 4

[0072] The main products in the cracking zone are C, H 2 , H 2 O, CO, CO 2 , CH 4 , tar and hydrocarbons, etc., after which the hot gases rise to the drying zone and the char descends to the oxidation zone.

[0073] An upper blowing pipe 51 and a lower blowing pipe 52 are installed at the throat of the oxidation zone in the furnace body 1. The upper blowing pipe 51 and the lower blowing pipe 52 spray air into the furnace body 1 from the upper and lower sides, and form an air intake mode combining upper and lower air intake and internal and external air intake with the air jet on the throwing screw device 3, so that the biomass material is fully in contact with the air, providing sufficient oxygen and increasing the gasification temperature;

[0074] Biomass materials contain a lot of oxygen. When the temperature rises to a certain level, oxygen will participate in the reaction and rapidly increase the temperature, thereby accelerating the completion of thermal decomposition. Since the reduction reaction between carbon and carbon dioxide and water vapor and the thermal decomposition of biomass materials are endothermic reactions, in order to maintain the high temperature in the gasifier, the residual carbon after gasification is usually partially burned with the oxygen in the gasifying agent to release heat.

[0075] The temperature in the oxidation zone can reach 1000-1200°C.

[0076] 2C+O 2 →2CO;

[0077] ΔH=246.034KJ / mol.

[0078] C+O 2 →CO 2 ;

[0079] ΔH=408.177KJ / mol.

[0080] There is no O in the reduction zone 2 There is CO generated in the oxidation reaction 2 In this area, it undergoes a reduction reaction with carbon and water vapor to generate CO and H 2 Since the reduction reaction is an endothermic reaction, the temperature of the reduction zone also decreases accordingly, to about 700-900°C.

[0081] C+CO 2 →2CO;

[0082] ΔH = -162.142 KJ / mol.

[0083] C+H 2 O(g)→CO+H 2 ;

[0084] ΔH = -118.628 KJ / mol.

[0085] C+2H 2 Og→CO 2 +2H 2 ;

[0086] ΔH = -75.114 KJ / mol.

[0087] Upper exhaust holes and lower exhaust holes are respectively arranged on the upper and lower sides of the grate, which can reduce the ash content in the flue gas generated after the combustion of biomass materials, while the tar that has not yet cracked continues to be thermally decomposed under the action of high-temperature ash, and heat transfer between gas and solid phases can still be carried out.

[0088] The flue gas generated after the combustion of the material enters the buffer chamber 9, exchanges heat with the heat-conducting fins 12 in the buffer chamber 9, and then enters the gas collection pipeline 10. The heat-conducting fins 12 increase the heat exchange area between the output gas and the buffer chamber 9, reduce the temperature of the output gas, and improve the thermal efficiency of the gasifier.

[0089] It should be noted that in the above embodiments, as long as the technical solutions are not contradictory, they can be arranged and combined, and those skilled in the art can exhaust all possibilities based on the mathematical knowledge of arrangement and combination. Therefore, the present invention will no longer describe the technical solutions after arrangement and combination one by one, but it should be understood that the technical solutions after arrangement and combination have been disclosed by the present invention.

[0090] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A new type of double-suction gasifier, characterized in that: The invention comprises a furnace body (1), a material pushing screw device (2), a material throwing screw device (3), an inclined slide plate (4), a blowing pipe group (5), a grate (6), an upper exhaust hole (7), a lower exhaust hole (8), a buffer chamber (9) and an air collecting pipeline (10). The material pushing screw device (2) is arranged at the material inlet of the furnace body (1), the material throwing screw device (3) is arranged on the furnace body (1) at the rear side of the material pushing screw device (2), the inclined slide plate (4) and the blowing pipe group (5) are arranged on the inner side wall of the furnace body (1) below the material throwing screw device (3), the furnace body (1) is provided with a grate (6), the upper exhaust hole (7) is opened on the side wall of the furnace body (1) above the grate (6), the lower exhaust hole (8) is opened on the side wall of the furnace body (1) below the grate (6), the exhaust hole of the furnace body (1) is arranged with a buffer chamber (9), and the buffer chamber (9) is connected to the air collecting pipeline (10).

2. A novel double-suction gasifier according to claim 1, characterized in that: The inclined slide plates (4) are multiple in number and are arranged in a staggered manner on the inner side wall of the furnace body (1) in opposite directions.

3. A novel double-suction gasifier according to claim 2, characterized in that: The blowing pipe group (5) comprises an upper blowing pipe (51) and a lower blowing pipe (52), and the upper blowing pipe (51) and the lower blowing pipe (52) are longitudinally arranged in sequence on the side wall of the furnace body (1).

4. A novel double-suction gasifier according to claim 3, characterized in that: An ash conveying belt transmission device (11) is arranged directly below the grate (6) at the bottom of the furnace body (1).

5. A novel double-suction gasifier according to claim 4, characterized in that: Heat-conducting fins (12) are arranged in the buffer chamber (9).

6. A novel double-suction gasifier according to claim 5, characterized in that: The air collection pipeline (10) is located on the side wall of the buffer chamber (9) at the top of the heat conducting fin (12).

7. A novel double-suction gasifier according to claim 6, characterized in that: There are a plurality of upper blowing pipes (51), all of which are arranged upwards on the side that protrudes into the furnace body (1), and there are a plurality of lower blowing pipes (52), all of which are arranged downwards on the side that protrudes into the furnace body (1).

8. A novel double-suction gasifier according to claim 7, characterized in that: The material throwing screw device (3) comprises a screw shaft (31) and a material throwing blade (32). The material throwing blade (32) is arranged on the screw shaft (31). The screw shaft (31) is a hollow structure and is provided with an air outlet (33) communicating with the outside.

9. A novel double-suction gasifier according to claim 8, characterized in that: It also comprises a swirl wheel (13), which is rotatably mounted at the bottom of the furnace body (1) via a rotating shaft, a driving motor is fixedly mounted on the furnace body (1), and the rotating shaft is connected to the output end of the driving motor via a chain transmission mechanism.

10. The double-suction gasification method of the novel double-suction gasifier according to claim 9, characterized in that: include: After the biomass material is fed into the feed port of the furnace body (1), it is pushed into the furnace body (1) by the pushing screw device (2) and then thrown by the throwing screw device (3) so that the biomass material is evenly distributed in the combustion chamber in the furnace body (1). When the biomass material falls, it passes through the inclined slide plates (4) arranged alternately in opposite directions, so that the biomass material slows down its falling speed during the falling process through the inclined slide plates (4), thereby prolonging the residence time of the biomass material in the drying area and the cracking area in the furnace body (1). An upper blowing pipe (51) and a lower blowing pipe (52) are installed at the throat of the oxidation zone in the furnace body (1). The upper blowing pipe (51) and the lower blowing pipe (52) spray air into the furnace body (1) from both sides, and together with the jet on the throwing screw device (3), form an air intake mode combining upper and lower air intake and internal and external air intake, so that the biomass material is fully in contact with the air. The smoke generated after the combustion of the material enters the buffer chamber (9), exchanges heat with the heat-conducting fins (12) in the buffer chamber (9), and then enters the air collection pipeline (10).

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