Biomass gasification device

Abstract

The application relates to a biomass gasification device and relates to the technical field of biomass gasification, which comprises a gasification hearth, a fluidized bed is arranged in the gasification hearth, a bubbling bed is arranged in the gasification hearth, a biomass gasification area is arranged between the bubbling bed and the fluidized bed, and the biomass gasification area is used for making biomass stack combustion; the bubbling bed is located at the upper end of the biomass gasification area, a feeding device is arranged on the gasification hearth, an air inlet pipe is arranged on the gasification hearth, the air inlet pipe is used for blowing air into the fluidized bed, the air inlet pipe is used for making fuel in the biomass gasification area tumble, the air inlet pipe is used for blowing the fuel which is not fully combusted on the fluidized bed to the bubbling bed, a cyclone separator is arranged on the upper portion of the gasification hearth, the cyclone separator outputs relatively clean combustible gas after carrying out gas-solid separation on dust-containing combustible gas, the cyclone separator is used for inputting the fuel which is not fully combusted into the bubbling bed, and an ignition device is arranged on the bubbling bed and the fluidized bed. The application has the effect of fully gasifying biomass fuel.

Description

Technical Field

[0001] This application relates to the field of biomass gasification technology, and in particular to a biomass gasification device. Background Technology

[0002] Biomass gasification is a thermochemical reaction that uses oxygen or oxygen-containing compounds from the air as a gasifying agent to convert biomass energy into combustible gas (mainly hydrogen, carbon monoxide, and methane) under high-temperature conditions. Biomass gasification technology plays a positive role in treating large amounts of agricultural and forestry waste, reducing environmental pollution, replacing fossil fuels, and achieving carbon neutrality. Currently, the most prevalent gasifier types in China are fixed-bed suction and fixed-bed downdraft gasifiers, which are widely used in food, textile, chemical, and industrial park centralized heating sectors. However, fixed-bed gasifiers currently suffer from two major technical drawbacks: the gasification byproduct (char) is discharged outside the furnace as ash without further gasification, and some units even discharge wet char, severely reducing the utilization rate of biomass fuel. Summary of the Invention

[0003] The purpose of this application is to provide a biomass gasification device to solve the technical problem that "gasification by-products (char) are all discharged from the furnace by slag discharge without further gasification".

[0004] This application provides a biomass gasification device with the following technical solution: A biomass gasification device includes a gasification furnace, a fluidized bed installed inside the gasification furnace, a bubbling bed installed inside the gasification furnace, and a biomass gasification zone provided between the bubbling bed and the fluidized bed, the biomass gasification zone being used for biomass gasification; the bubbling bed is located at the upper end of the biomass gasification zone, a feeding device is provided on the gasification furnace, the feeding device being used for feeding fuel onto the fluidized bed, an air inlet pipe is provided on the gasification furnace, the air inlet pipe being used for blowing air into the fluidized bed, the air inlet pipe being used for agitating the fuel in the biomass gasification zone, and the air inlet pipe... This system is used to blow unburned fuel and bubbling bed material from a fluidized bed onto a bubbling bed. A second air inlet pipe is provided on the lower side of the bubbling bed to introduce low-oxygen gas and generate bubbles. A steam input pipe is installed on the bubbling bed to introduce steam. A cyclone separator is installed on the gasification furnace, and a gas delivery fan is installed on one side of the cyclone separator to create negative pressure inside the cyclone separator. The cyclone separator is used to introduce unburned fuel into the bubbling bed. Ignition devices are provided on the bubbling bed and the fluidized bed.

[0005] Optionally, the gasification furnace includes a fluidization zone and a bubbling zone, wherein the cross-sectional area of ​​the bubbling zone is larger than that of the fluidization zone, and the bubbling bed and the fluidization bed are disposed inside the furnace.

[0006] Optionally, the bubbling bed surrounds the biomass gasification zone, and the bubbling bed is inclined and fixed at the upper end of the biomass gasification zone for feeding the cooled fuel and bed material into the fluidized bed; the bubbling bed is inclined and fixed in the fluidized zone, and the side of the bubbling bed near the biomass gasification zone is lower than the side of the bubbling bed near the inner wall of the gasification furnace.

[0007] Optionally, the bubbling bed is provided with a partition on the side near the biomass gasification zone, and a feeding channel is provided on the lower side of the partition.

[0008] Optionally, the cyclone separator includes a cyclone separation chamber, on which an air suction pipe is installed. The air suction pipe is connected to the gasification furnace. The gas delivery blower has a boiler furnace at its outlet. A return feeder is installed at the lower end of the cyclone separation chamber. A return chamber is located at the lower end of the return feeder and is connected to the gasification furnace. The return chamber is used to transport unburned fuel to the bubbling bed. The return feeder is used to form a closed structure at the lower end of the cyclone separation chamber and to input fuel into the return chamber.

[0009] Optionally, a bubbling chamber is provided on the lower side of the bubbling bed. The bubbling chamber is connected to the second air inlet pipe and the steam input pipe. The bubbling chamber is used to mix high-temperature flue gas with water vapor. Multiple gas nozzles are provided at the upper end of the bubbling chamber. The gas nozzles are used to input the mixed gas into the bubbling bed.

[0010] Optionally, the return feeder includes a return hopper, an accumulation pipe installed at the upper end of the return hopper, the accumulation pipe connecting the return hopper to the cyclone separation chamber, a vibrating plate inclinedly arranged inside the return hopper, and a return pipe arranged on the upper side of the return hopper, the return pipe connecting the return hopper to the return chamber, and the vibrating plate driving the fuel flow within the return hopper; the accumulation pipe, the return hopper, and the return pipe form a U-shaped structure.

[0011] Optionally, a return flue gas pipe is installed on the return chamber. The return flue gas pipe is used to blow the fuel in the return chamber to the bubbling bed. The return flue gas pipe and the second air inlet pipe are connected to the boiler furnace. The return flue gas pipe and the second air inlet pipe are used to transport the high-temperature flue gas after combustion.

[0012] Optionally, a dust grid is provided in the bubbling chamber, the dust grid is connected to a DC power supply, the dust grid is used to remove dust from the flue gas, a dust outlet is provided on one side of the bubbling chamber, a dust discharge switch is provided on the dust outlet, and a dust collection airbag is detachably installed on the dust outlet.

[0013] Optionally, an air distribution plate is provided on the lower side of the fluidized bed. The air distribution plate is connected to the air inlet pipe and is used to uniformly transport gas to the lower side of the fluidized bed.

[0014] In summary, this application includes at least one of the following beneficial technical effects:

[0015] 1. In the biomass fuel gasification process, biomass fuel is first fed into the biomass gasification zone through a feeding device. After being fully heated on the fluidized bed, it undergoes anaerobic combustion in the biomass gasification zone to generate combustible gas. During the combustion of biomass fuel, organic matter is continuously decomposed and moisture is lost, producing char, which becomes lighter in weight. The gas blown out of the inlet pipe blows the char from the combustion to the bubble bed, where it reacts with steam to generate combustible gas again, thus allowing the biomass fuel to react fully.

[0016] 2. During the combustion of biomass fuel, the cyclone separator works in conjunction with the gas conveying fan to transport combustible gas to the furnace. The cyclone separator then transports the unburned char back to the bubbling bed to react with steam again, thereby allowing the biomass fuel to react fully and produce more combustible gas.

[0017] 3. During the reaction of biomass fuel in the biomass gasification zone, the gas blown out of the inlet pipe agitates the fuel, providing an appropriate amount of oxygen for combustion. This enables the biomass fuel to undergo anaerobic combustion on the fluidized bed, while simultaneously providing heat to the fluidized bed matrix. During combustion, the char from the combustion process travels with the gas flow to the bubbling bed as sparks, where it reacts with water vapor to produce carbon monoxide and hydrogen. After the char cools, it returns to the fluidized bed for reheating until complete gasification.

[0018] 4. The bubbling bed removes surface dust from the burning char, allowing the char to come into contact with steam, thereby improving gasification efficiency;

[0019] 5. Bubbling bed and fluidized bed are in the same chamber, which reduces fuel transfer, reduces heat loss, and improves fuel utilization efficiency.

[0020] 6. During the gasification process, tiny sparks (hot charcoal) enter the cyclone separator, where they are separated, allowing combustible gas and dust to be transported to the furnace, while the charcoal is transported back to the bubble bed, thus enabling complete gasification of biomass fuel.

[0021] 7. Gasifying biomass fuel before combustion allows for full utilization of biomass energy while reducing harmful gas emissions. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0023] Figure 2 This is a schematic diagram of the cross-sectional structure of the gasification furnace implemented in this application;

[0024] Figure 3This is a schematic cross-sectional view of the gasification furnace in an embodiment of this application;

[0025] Figure 4 This is a schematic cross-sectional view of the cyclone separator according to an embodiment of this application;

[0026] In the diagram, 1. Gasification furnace; 11. Fluidization zone; 12. Bubbling zone; 2. Fluidized bed; 21. Air distribution plate; 3. Bubbling bed; 31. Second air inlet pipe; 32. Steam input pipe; 33. Bubbling air chamber; 34. Return flue gas pipe; 35. Gas nozzle; 36. Dust grid; 37. Dust outlet; 38. Dust collection air bag; 4. Biomass gasification zone; 41. Baffle plate; 42. Feeding channel; 5. Feeding device; 6. Second air inlet pipe; 7. Cyclone separator; 71. Cyclone separation chamber; 72. Suction pipe; 73. Gas conveying fan; 75. Return feeder; 751. Return hopper; 752. Stacking pipe; 753. Vibrating plate; 754. Return pipe; 76. Return chamber; 8. Ignition device; 9. Boiler furnace. Detailed Implementation

[0027] The following is in conjunction with the appendix Figure 1 - Appendix Figure 4 This application will be described in further detail below.

[0028] Reference Figure 1 , Figure 2A biomass gasification device includes a gasification furnace 1, a fluidized bed 2 installed inside the gasification furnace 1, a bubbling bed 3 installed inside the gasification furnace 1, and a biomass gasification zone 4 between the bubbling bed 3 and the fluidized bed 2. The biomass gasification zone 4 is used for biomass gasification. The bubbling bed 3 is located at the upper end of the biomass gasification zone 4. A feeding device 5 (a conveying auger) is installed on the gasification furnace 1 to feed fuel onto the fluidized bed 2. A first air inlet pipe 6 is installed on the gasification furnace 1 (the first air inlet pipe 6 heats the gas through an air heating device installed on the combustion furnace before feeding it into the fluidized bed 2 to reduce heat loss). The first air inlet pipe 6 is used to blow air into the fluidized bed 2, to agitate the fuel in the biomass gasification zone 4, and to blow unburned fuel and bubbling bed material from the fluidized bed 2 onto the bubbling bed 3. A second air inlet pipe 31 is provided on the lower side of the bubbling bed 3. The second air inlet pipe 31 is used to input low-oxygen gas into the bubbling bed 3 and to cause the bubbling bed 3 to produce bubbles. A steam input pipe 32 is installed on the bubbling bed 3 and is used to input water vapor into the bubbling bed 3. A cyclone separator 7 is installed on the gasification furnace 1. A gas delivery fan 73 is installed on one side of the cyclone separator 7 and is used to generate negative pressure in the cyclone separator 7. The cyclone separator 7 is used to input unburned fuel into the bubbling bed 3. An ignition device 8 is provided on the bubbling bed 3 and the fluidized bed 2 (the ignition device 8 includes a liquid fuel spray head and an electronic pulse igniter. The fuel sprayed on the bubbling bed 3 and the fluidized bed 2 is ignited by the electronic pulse igniter, so as to heat up the bed material on the bubbling bed 3 and the fluidized bed 2 and enable the biomass fuel to be burned in low oxygen).

[0029] In the process of gasifying biomass fuel, the fluidized bed 2 and the bubbling bed 3 are first heated by the ignition device 8 to raise the temperature of the bed material on the fluidized bed 2 and the bubbling bed 3. At this time, the biomass fuel is fed onto the fluidized bed 2 through the feeding device 5, and the biomass undergoes a gasification reaction on the fluidized bed.

[0030] During the fuel gasification reaction, oxygen-deficient combustion provides the temperature for the gasification reaction. The gas blown in through the first inlet pipe 6 agitates the bed material and fuel. The lighter, incandescent char produced during the oxygen-deficient combustion process is blown into the bubbling bed 3. The incandescent char accumulates on the bubbling bed, generating sufficient heat. At this time, steam is introduced through the steam input pipe 34. The steam reacts with the incandescent char to produce carbon monoxide and hydrogen. Meanwhile, the cyclone separator 7 generates negative pressure under the action of the gas delivery fan 73, drawing the combustible gas from the gasification furnace 1. The combustible gas enters the cyclone separator 7 and is fed into the boiler furnace 9 for combustion via the gas conveying fan 73. The generated dust and unburned char enter the cyclone separator 7, and the unburned char re-enters the bubbling bed 3 for further reaction. The combustible gas and dust follow the airflow into the boiler furnace 9 for combustion. Thus, biomass fuel can fully react in the gasification furnace 1 to generate combustible gas, reducing the generation of gasification by-products (char) and thereby improving the utilization rate of biomass fuel.

[0031] The hot char is blown into the bubbling bed 3. After the water-gas reaction takes place on the bubbling bed 3, the heat is absorbed, and the char can then return to the fluidized bed 2 for another reaction. After being fully heated, the char is blown back to the bubbling bed 3 for another reaction. During the char exchange, the heated bed material on the fluidized bed 2 can also be blown along with the hot char to the bubbling bed 3, thus ensuring that the fluidized bed 2 and the bubbling bed 3 have sufficient heat to complete the gasification of biomass fuel.

[0032] Biomass fuel circulates back and forth between fluidized bed 2, bubbling bed 3 and cyclone separator 7 until it is completely gasified to produce combustible gas and dust, thereby reducing the generation of gasification by-products (char) and improving the utilization rate of biomass fuel.

[0033] Refer to Figure 1. Figure 2 The gasification furnace 1 is equipped with a fluidization zone 11 and a bubbling zone 12. The cross-sectional area of ​​the bubbling zone 12 is larger than that of the fluidization zone 11. Biomass fuel reacts in the fluidized bed 2, and the generated char (hot char) rises with the airflow. When it reaches the bubbling zone 12, the airflow speed slows down, and the char falls onto the bubbling bed 3 to continue gasification. Water vapor is introduced into the burning char, and hydrogen and methane are generated under high temperature (water-gas reaction). After the char reacts with the water vapor, the temperature decreases. Under the action of bubbling, the char that has decreased in temperature falls back onto the sulfurized bed 2 for heating, and then returns to the bubbling bed 3 with the airflow. This cycle continues until complete gasification, thereby reducing the generation of gasification byproducts (char) and improving the utilization rate of biomass fuel.

[0034] Reference Figure 1 , Figure 2A bubbling bed 3 surrounds the biomass gasification zone 4 and is fixed at an incline at the upper end of the biomass gasification zone 4. It is used to feed the cooled fuel and bed material into the fluidized bed 2. The bubbling bed 3 is fixed at an incline in the fluidized zone 11. The biomass fuel is gasified on the fluidized bed 2. The char 3 in combustion follows the airflow to the bubbling bed 3 and reacts with water vapor on the bubbling bed 3 to generate carbon monoxide and hydrogen. After the char reacts with the water vapor, the heat is absorbed and the temperature drops. During the bubbling process, the char slides down with the bed material onto the sulfurized bed 2 and is heated again. The side of the bubbling bed 3 near the biomass gasification zone 4 is lower than the side of the bubbling bed 3 near the inner wall of the gasification furnace 1, which promotes the exchange rate of combustion materials and effectively prevents the char temperature from being too low, thus affecting the biomass gasification efficiency.

[0035] Reference Figure 1 , Figure 2 , Figure 3 A baffle 41 is provided on the side of the bubbling bed 3 near the biomass gasification zone 4, and a feeding channel 42 is provided on the lower side of the baffle 41. Under the action of the baffle 41, the burning char and bed material can accumulate on the bubbling bed 3. The bubbling bed 3 can have sufficient heat to react with water vapor to generate carbon monoxide and hydrogen. The char that has cooled down can return to the fluidized bed 2 through the feeding channel to absorb heat again.

[0036] Reference Figure 1 , Figure 2 , Figure 4 The cyclone separator 7 includes a cyclone separation chamber 71, on which a suction pipe 72 is installed. The suction pipe 72 is connected to the gasification furnace 1. A boiler furnace 9 is provided at the outlet end of the gas conveying blower 73. A return feeder 75 is installed at the lower end of the cyclone separation chamber 71. A return chamber 76 is provided at the lower end of the return feeder 75. The return chamber 76 is connected to the gasification furnace 1. The return chamber 76 is used to transport unburned fuel to the bubbling bed 3. The return feeder 75 is used to form a closed structure at the lower end of the cyclone separation chamber 71 and input the fuel into the return chamber 76.

[0037] During operation, the gas conveying fan 73 rotates, creating a negative pressure in the cyclone separation chamber 71. Combustible gas enters the cyclone separation chamber 71 through the suction pipe 72. The airflow in the suction pipe 72 is much greater than that in the cyclone separation chamber 71, causing unburned char to fall downwards into the return feeder 75 and be transported to the return chamber 76. Through the return chamber 76, it is transported to the bubbling bed 3 to continue reacting with water vapor to generate carbon monoxide and hydrogen. The lighter ash is output with the airflow and enters the boiler furnace 9.

[0038] Reference Figure 2 , Figure 3A bubbling chamber 33 is provided on the lower side of the bubbling bed 3. The bubbling chamber 33 is connected to the second air inlet pipe 31 and the steam input pipe 32. The bubbling chamber 33 is used to mix high-temperature flue gas with water vapor. Multiple gas nozzles 35 are provided on the upper end of the bubbling chamber 33. The gas nozzles 35 are used to input the mixed gas into the bubbling bed 3.

[0039] The second air inlet pipe 31 is connected to the boiler furnace 9 at the end away from the bubbling air chamber 33, and introduces the high-temperature gas in the boiler furnace 9 into the bubbling air chamber 33. After mixing with water vapor in the bubbling air chamber 33, the gas is discharged from the gas nozzle 35 fixed on the upper side of the bubbling air chamber 33, causing the bed material on the upper side of the bubbling bed 3 to turn over. The bed material can remove the dust on the surface of the carbon, promote the reaction between carbon and water vapor, and produce carbon monoxide and hydrogen, thereby increasing the reaction rate.

[0040] Under the action of the bubbling chamber 33, the air pressure reaching the gas nozzle 35 is the same, thereby making the bubbling of the bubbling bed 3 uniform;

[0041] Introducing high-temperature flue gas into the bubbling chamber 33 and reacting it with high-temperature carbon can reduce the heat loss of the high-temperature carbon. At the same time, carbon dioxide reacts with carbon at high temperature to generate carbon monoxide, which can increase fuel production.

[0042] Reference Figure 1 , Figure 4 The return feeder 75 includes a return hopper 751, with an accumulation pipe 752 installed at the upper end of the return hopper 751. The accumulation pipe 752 connects the return hopper 751 to the cyclone separator 71. A vibrating plate 753 is inclinedly arranged inside the return hopper 751. A return pipe 754 is arranged on the upper side of the return hopper 751. The return pipe 754 is used to connect the return hopper 751 to the return chamber 76. The vibrating plate 753 is used to promote the flow of fuel in the return hopper 751. The return pipe 754 includes a vertical section and an inclined section. The vertical section, the accumulation pipe 752, and the return hopper 751 form a U-shaped structure. The inclined section is used to input carbon into the return chamber 76.

[0043] When high-temperature char and combustible gas enter the cyclone separator 71, after separation, the high-temperature char falls into the return hopper 751 and accumulates there, eventually sealing the accumulation pipe 752 to form a closed structure. As the high-temperature char continues to accumulate, it is then vibrated by the vibrating plate 753, causing the heights of the vertical sections of the accumulation pipe 752 and the return pipe 754 to become more consistent. Once the height of the char in the vertical section exceeds that of the vertical section, it flows into the return hopper 76 from the inclined section. This allows the high-temperature char to be transported from the return pipe 754 to the return hopper 76, and then transported back to the bubbling bed 3, thus completely gasifying the biomass fuel.

[0044] Reference Figure 1 , Figure 3A dust grid 36 is installed inside the bubbling chamber 33. The dust grid 36 is connected to a DC power supply and is used to remove dust from the flue gas. A dust discharge outlet 37 is provided on one side of the bubbling chamber 33. A dust discharge switch is provided on the dust discharge outlet 37. A dust collection air bag 38 is detachably installed on the dust discharge outlet 37.

[0045] Optionally, an air distribution plate 21 is provided on the lower side of the fluidized bed 2. The air distribution plate 21 is connected to the first air inlet pipe 6. The air distribution plate 21 is used to uniformly transport the gas to the lower side of the fluidized bed 2.

[0046] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A biomass gasification device, characterized in that: The system includes a gasification furnace (1), a fluidized bed (2) installed inside the gasification furnace (1), a bubbling bed (3) installed inside the gasification furnace (1), and a biomass gasification zone (4) between the bubbling bed (3) and the fluidized bed (2), the biomass gasification zone (4) being used to gasify biomass; the bubbling bed (3) is located at the upper end of the biomass gasification zone (4), a feeding device (5) is provided on the gasification furnace (1), the feeding device (5) being used to feed fuel onto the fluidized bed (2), a first air inlet pipe (6) is provided on the gasification furnace (1), the first air inlet pipe (6) being used to blow air into the fluidized bed (2), and the first air inlet pipe (6) being used to feed fuel into the biomass gasification zone (4). The first air inlet pipe (6) is used to blow the unburned fuel and bubbling bed material on the fluidized bed (2) to the bubbling bed (3). A second air inlet pipe (31) is provided on the lower side of the bubbling bed (3). The second air inlet pipe (31) is used to input low-oxygen gas into the bubbling bed (3) and to cause the bubbling bed (3) to produce bubbles. A steam input pipe (32) is installed on the bubbling bed (3). The steam input pipe (32) is used to input water vapor into the bubbling bed (3). A cyclone separator (7) is installed on the gasification furnace (1). A gas conveying fan (73) is installed on one side of the cyclone separator (7). The gas conveying fan (73) is used to cause the cyclone separator (7) to produce bubbles. Negative pressure; the cyclone separator (7) is used to input unburned fuel into the bubbling bed (3); an ignition device (8) is provided on the bubbling bed (3) and the fluidized bed (2); the cyclone separator (7) includes a cyclone separation chamber (71); a suction pipe (72) is installed on the cyclone separation chamber (71); the suction pipe (72) is connected to the gasification furnace (1); a boiler furnace (9) is provided at the outlet end of the gas conveying blower (73); a return feeder (75) is installed at the lower end of the cyclone separation chamber (71); a return chamber (76) is provided at the lower end of the return feeder (75); the return chamber (76) is connected to the gasification furnace (1); the return chamber (76) is used to input unburned fuel into the bubbling bed (3); an ignition device (8) is provided on the bubbling bed (3) and the fluidized bed (2); the cyclone separator (7) includes a cyclone separation chamber (71); a suction pipe (72) is installed on the cyclone separation chamber (71); the suction pipe (72) is connected to the gasification furnace (1); the return chamber (76) is used to input unburned fuel into the bubbling bed (3); an ignition device (8) is provided on the bubbling bed (3) and the fluidized bed (2); the cyclone separator (7) includes a cyclone separation chamber (71); a suction pipe (72) is installed on the cyclone separation chamber (71); a suction pipe (72) is connected to the gasification furnace (1); the return chamber (76) is used to input unburned fuel into the gasification furnace (1); the return chamber (76) is used to input unburned fuel into the gasification furnace (2); the cyclone separator (71) includes a cyclone separation chamber (71); a suction pipe (72) is installed on the cyclone separation chamber (71); a suction pipe (7 The fuel is fed onto the bubbling bed (3). The return feeder (75) is used to form a closed structure at the lower end of the cyclone separator (71) and input the fuel into the return feed chamber (76). The return feeder (75) includes a return hopper (751). An accumulation pipe (752) is installed at the upper end of the return hopper (751). The accumulation pipe (752) connects the return hopper (751) to the cyclone separator (71). A vibrating plate (753) is inclinedly arranged inside the return hopper (751). A return pipe (754) is arranged on the upper side of the return hopper (751). The return pipe (754) is used to connect the return hopper (751) to the return feed chamber (76). The vibrating plate (753) is used to push the fuel flow in the return hopper (751).The stacking pipe (752), the return hopper (751), and the return pipe (754) form a U-shaped structure.

2. The biomass gasification device according to claim 1, characterized in that, The gasification furnace (1) includes a fluidization zone (11) and a bubbling zone (12). The cross-sectional area of ​​the furnace in the bubbling zone (12) is larger than that in the furnace in the fluidization zone (11). The bubbling bed (3) and the fluidization bed (2) are located inside the fluidization zone (11).

3. The biomass gasification device according to claim 2, characterized in that, The bubbling bed (3) surrounds the biomass gasification zone (4) and is fixed at an angle to the upper end of the biomass gasification zone (4) for feeding the cooled fuel and bed material into the fluidized bed (2); the bubbling bed (3) is fixed at an angle to the fluidized zone (11), and the side of the bubbling bed (3) near the biomass gasification zone (4) is lower than the side of the bubbling bed (3) near the inner wall of the gasification furnace (1).

4. A biomass gasification device according to claim 3, characterized in that, The bubble bed (3) is provided with a partition (41) on the side near the biomass gasification zone (4), and a feeding channel (42) is provided on the lower side of the partition (41).

5. A biomass gasification device according to claim 4, characterized in that, A bubbling chamber (33) is provided on the lower side of the bubbling bed (3). The bubbling chamber (33) is connected to the second air inlet pipe (31) and the steam input pipe (32). The bubbling chamber (33) is used to mix high-temperature flue gas with water vapor. Multiple gas nozzles (35) are provided at the upper end of the bubbling chamber (33). The gas nozzles (35) are used to input the mixed gas into the bubbling bed (3).

6. A biomass gasification device according to claim 5, characterized in that, The return material chamber (76) is equipped with a return material flue gas pipe (34), which is used to blow the fuel in the return material chamber (76) to the bubbling bed (3). The return material flue gas pipe (34) and the second air inlet pipe (31) are connected to the boiler furnace (9). The return material flue gas pipe (34) and the second air inlet pipe (31) are used to transport the high-temperature flue gas after combustion.

7. A biomass gasification device according to claim 6, characterized in that, The bubbling chamber (33) is equipped with a dust grid (36), which is connected to a DC power supply. The dust grid (36) is used to remove dust from the flue gas. A dust discharge port (37) is provided on one side of the bubbling chamber (33). A dust discharge switch is provided on the dust discharge port (37). A dust collection air bag (38) can be detachably installed on the dust discharge port (37).

8. A biomass gasification device according to claim 1, characterized in that, A distribution plate (21) is provided on the lower side of the fluidized bed (2). The distribution plate (21) is connected to the first air inlet pipe (6). The distribution plate (21) is used to uniformly transport gas to the lower side of the fluidized bed (2).

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