Pyrolysis gasification generator and biomass gasification furnace with same

Abstract

The invention relates to a cracking gasification generator and a biomass gasifier with the cracking gasification generator, and belongs to the technical field of gasifiers, the cracking gasification generator comprises an annular pipe, the annular pipe is provided with a biomass gas inlet, a high-temperature gas inlet and gas distribution holes, a heat exchange cavity and a flow mixing cavity are formed in the annular pipe, and a flow guide heat exchange channel and a heating channel are arranged in the heat exchange cavity; one end of the flow guide heat exchange channel is communicated with the biomass gas inlet, the other end of the flow guide heat exchange channel is communicated with the mixed flow cavity, one end of the heating channel is communicated with the high-temperature gas inlet, the other end of the heating channel is communicated with the mixed flow cavity, and the gas distribution holes are distributed in the cavity wall of the mixed flow cavity. And the wood tar is fully subjected to heat exchange with high-temperature gas, so that the wood tar is subjected to a thermal chemical reaction with superheated water vapor, carbon powder and other airflow carriers in a high-temperature environment, the wood tar is synchronously cracked and catalyzed in the biomass gas production process, and the wood tar content in the biomass gas is greatly reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of gasifiers, and in particular relates to a pyrolysis gasification generator and a biomass gasifier having the same. Background Art

[0002] Biomass gasifier is a gasifier for producing straw gas. Existing fixed bed gasifiers can be divided into upward suction type, downward suction type, horizontal suction type, etc. according to the direction of airflow. In the downward suction gasifier, the gas and materials are mixed and move downward. When the wood tar in the gas passes through the lower high temperature zone, part of it is cracked into small molecular gas. The tar content of the gas out of the furnace is 8000-10000mg / Nm 3 , slightly negative pressure operation, low sealing requirements, high output gas temperature, medium calorific value, materials with a moisture content of less than 30%, blocks and a small amount of coarse particles mixed together; the upward suction gasifier airflow is opposite to the material movement direction, the material moves downward, the airflow is upward, slightly positive pressure operation, high sealing requirements, less ash in combustible gas. Materials with a moisture content of 50% can be used, and the tar content of the outgoing gas is 8000-10000mg / Nm 3 , because there is no wood tar control equipment in the furnace, the biomass gas produced has a high wood tar content.

[0003] Therefore, a pyrolysis gasification generator capable of reducing the wood tar content in biomass gas and a biomass gasifier having the same are in urgent need of appearance. Summary of the invention

[0004] The invention provides a pyrolysis gasification generator and a biomass gasification furnace having the same, which are used to solve the technical problem that the biomass gas in the biomass gasification furnace in the prior art has a high wood tar content and requires a secondary oil removal process.

[0005] The present invention is achieved through the following technical scheme: a pyrolysis gasification generator, comprising an annular tube, the annular tube is provided with a biomass gas inlet, a high-temperature gas inlet and gas distribution holes, a heat exchange chamber and a mixed flow chamber are provided in the annular tube, a guide heat exchange channel and a heating channel are provided in the heat exchange chamber, one end of the guide heat exchange channel is connected to the biomass gas inlet and the other end is connected to the mixed flow chamber, one end of the heating channel is connected to the high-temperature gas inlet and the other end is connected to the mixed flow chamber, and the gas distribution holes are arranged on the cavity wall of the mixed flow chamber.

[0006] In order to better realize the present invention, further optimization is made in the above structure, which also includes a guide tube and a center tube, the annular tube is provided with end plates and ring plates at intervals, the annular tube is divided into the heat exchange chamber and the mixed flow chamber by the end plate and the ring plate, the guide tube and the center tube are arranged in the heat exchange chamber, one end of the center tube is fixedly connected to the end plate and the other end is connected to the mixed flow chamber, one end of the guide tube is fixedly connected to the ring plate and the other end is sleeved outside the center tube, the guide heat exchange channel includes a guide channel and a heat exchange channel, the guide channel is between the guide tube and the annular tube, the heat exchange channel is between the guide tube and the center tube, and the tube hole of the center tube is the heating channel.

[0007] In order to better realize the present invention, further optimization is made in the above structure, the central tube includes a light tube and a fish scale hole tube, the light tube and the fish scale hole tube are an integrated structural component, one end of the light tube is fixedly connected to the end plate, and the other end of the light tube is connected to the fish scale hole tube.

[0008] In order to better realize the present invention, further optimization is made in the above structure, and the guide tube is a structural member made of high temperature resistant composite material.

[0009] In order to better realize the present invention, further optimization is made in the above structure, and the annular tube is a structural member made of heat-resistant steel.

[0010] A biomass gasifier comprises a furnace body, a circulating air device and a cracking gasification generator, wherein a plurality of annular tubes of the cracking gasification generators are arranged in parallel and at intervals in the furnace body, an air inlet of the circulating air device is communicated with a furnace cavity of the furnace body, an air outlet of the circulating air device is communicated with a biomass gas inlet of the annular tube, a furnace wall of the furnace body is provided with a plurality of vents, one end of the vent is communicated with a high-temperature gas inlet of the annular tube at a corresponding position, and the other end of the vent is communicated with an external burner.

[0011] In order to better realize the present invention, further optimization is made in the above structure. The circulating air device includes an exhaust pipe and multiple circulating fans. The exhaust pipe is vertically arranged at the center of the furnace body. The pipe wall of the exhaust pipe is provided with multiple air inlet holes. An air guide pipe is provided on the top of the exhaust pipe. The air inlets of the circulating fans are connected to the air guide pipe, and the air outlets of the circulating fans are connected to the biomass gas inlet of the annular pipe at the corresponding position.

[0012] In order to better realize the present invention, further optimization is made in the above structure, the exhaust pipe includes an inner pipe and an outer pipe, the air guide pipe includes an inner air guide pipe and an outer air guide pipe, an annular baffle is provided in the middle of the outer pipe, the bottom of the inner pipe is fixedly connected to the annular baffle, the inner air guide pipe is connected to the inner pipe, and the outer air guide pipe is connected to the outer pipe.

[0013] In order to better implement the present invention, the above structure is further optimized to further include an inclined baffle, and the inclined baffle is provided above each of the air inlet holes.

[0014] In order to better realize the present invention, the above structure is further optimized, and further includes a rotating chain ring and an anchor, wherein the rotating chain ring is arranged in the furnace body, and at least two of the anchors are hung on the rotating chain ring.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The pyrolysis gasification generator provided by the present invention comprises an annular tube, which is provided with a biomass gas inlet, a high-temperature gas inlet and gas distribution holes. A heat exchange chamber and a mixed flow chamber are provided in the annular tube. A flow guiding heat exchange channel and a heating channel are provided in the heat exchange chamber. One end of the flow guiding heat exchange channel is connected with the biomass gas inlet and the other end is connected with the mixed flow chamber. One end of the heating channel is connected with the high-temperature gas inlet and the other end is connected with the mixed flow chamber. The gas distribution holes are arranged on the cavity wall of the mixed flow chamber. With this structure, during the production process, the biomass gas rich in wood tar enters the flow guiding heat exchange channel through the biomass gas inlet, thereby fully exchanging heat with the high-temperature gas entering from the high-temperature gas inlet, so that the wood tar reacts with the superheated water steam, carbon powder and other air flow-carried objects in a thermochemical reaction in a high-temperature environment, thereby realizing the simultaneous pyrolysis catalysis of the wood tar during the biomass gas production process, greatly reducing the wood tar content in the biomass gas, and can be directly used for industrial production without secondary tar removal.

[0017] The present invention also provides a biomass gasification furnace including a furnace body, a circulating air device and a cracking gasification generator, wherein the annular tubes of the plurality of cracking gasification generators are arranged in parallel and at intervals in the furnace body, the air inlet of the circulating air device is connected to the furnace cavity of the furnace body, the air outlet of the circulating air device is connected to the biomass gas inlet of the annular tube, the furnace wall of the furnace body is provided with a plurality of vents, one end of the vent is connected to the high-temperature gas inlet of the annular tube at a corresponding position, and the other end of the vent is connected to an external burner. With this structure, the biomass gas with a high wood tar content generated in the furnace body is continuously fed into the cracking gasification generator through the circulating air device, so that the wood tar is cracked to obtain high-temperature biomass gas with a low wood tar content and discharged into the furnace body, thereby promoting the materials in the furnace body to generate new biomass gas, so that the cracking of wood tar and the generation of biomass gas are circulated, thereby increasing the biomass gas yield and reducing the wood tar content. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 is an expanded view of the cracking gasification generator of the present invention;

[0020] Figure 2 It is a schematic diagram of the structure of the biomass gasifier in the present invention.

[0021] In the figure:

[0022] 1-annular tube; 2-biomass gas inlet; 3-high-temperature gas inlet; 4-air distribution hole; 5-heat exchange chamber; 6-mixing chamber; 7-heating channel; 8-flow guide channel; 9-heat exchange channel; 10-flow guide tube; 11-central tube; 12-end plate; 13-annular plate; 14-fish scale hole tube; 15-furnace body; 16-air vent; 17-inner tube; 18-outer tube; 19-circulating fan; 20-air inlet; 21-inner air guide tube; 22-outer air guide tube; 23-annular baffle; 24-oblique baffle; 25-rotating chain ring; 26-iron anchor; 27-feeding port; 28-slag discharge port; 29-exhaust pipe. DETAILED DESCRIPTION

[0023] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that, unless otherwise specified, the meaning of "plurality" is two or more; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Embodiment 1:

[0027] In this embodiment, a pyrolysis gasification generator, such as Figure 1 As shown, it includes an annular tube 1, which is provided with a biomass gas inlet 2, a high-temperature gas inlet 3 and an air distribution hole 4. A heat exchange chamber 5 and a mixing chamber 6 are provided in the annular tube 1. A guide heat exchange channel 9 and a heating channel 7 are provided in the heat exchange chamber 5. One end of the guide heat exchange channel 9 is connected with the biomass gas inlet 2 and the other end is connected with the mixing chamber 6. One end of the heating channel 7 is connected with the high-temperature gas inlet 3 and the other end is connected with the mixing chamber 6. The air distribution hole 4 is arranged on the cavity wall of the mixing chamber 6. The biomass gas and the high-temperature gas enter the heat exchange chamber 5 through the guide heat exchange channel 9 and the heating channel 7 respectively, so that the biomass gas is fully heated to crack the wood tar therein, and then enters the mixing chamber 6 to be fully mixed to form a biomass gas with a low wood tar content.

[0028] By adopting this structure, the generator is built into the gasifier, and the biomass gas rich in wood tar enters the above-mentioned guide heat exchange channel 9 through the above-mentioned biomass gas inlet 2 during the production process, thereby fully exchanging heat with the high-temperature gas entering from the above-mentioned high-temperature gas inlet 3, so that the wood tar and the superheated water vapor, carbon powder and other air flow carried in the biomass gas undergo thermochemical reactions in a high-temperature environment, thereby achieving simultaneous cracking and catalytic performance of the wood tar during the biomass gas production process, greatly reducing the wood tar content in the biomass gas, and allowing it to be directly used for industrial production without the need for secondary tar removal.

[0029] As a specific implementation of this embodiment, Figure 1As shown, it also includes a guide tube 10 and a central tube 11. Specifically, an end plate 12 and a ring plate 13 are arranged in the annular tube 1. The annular tube 1 is divided into the heat exchange chamber 5 and the mixed flow chamber 6 by the end plate 12 and the ring plate 13. The guide tube 10 and the central tube 11 are coaxially arranged in the heat exchange chamber 5. One end of the central tube 11 is fixedly connected to the end plate 12 and the other end is connected to the mixed flow chamber 6. One end of the guide tube 10 is fixedly connected to the ring plate 13 and the other end is sleeved outside the central tube 11. The non-fixed ends of the guide tube 10 and the central tube 11 are both suspended. The guide heat exchange channel 9 includes a guide channel 8 and a heat exchange channel 9. The guide channel 8 is between the guide tube 10 and the annular tube 1, and the heat exchange channel 9 is between the guide tube 10 and the central tube 11. The central tube 11 The pipe hole is the above-mentioned heating channel 7, and the above-mentioned guide channel 8 is connected with the above-mentioned biomass gas inlet 2. The biomass gas needs to pass through the above-mentioned guide channel 8 and the heat exchange channel 9 in the above-mentioned heat exchange chamber 5, so that the heat exchange time and path are longer, so that the wood tar in the biomass gas can be more fully cracked. On the other hand, the high-temperature gas enters the above-mentioned heating channel 7 through the above-mentioned high-temperature gas inlet 3, and the high-temperature gas flows through the above-mentioned central tube 11 throughout the process. The regional temperature of the above-mentioned heating channel 7 is the highest, and the temperature gradually rises from the inside to the outside through the above-mentioned central tube 11 and the guide tube 10, so that the heat exchange with the biomass gas is more sufficient, the heating process is longer, and the cracking efficiency of the wood tar is further improved. The above-mentioned guide tube 10 is a structural member made of high-temperature resistant composite materials, and the above-mentioned annular tube 1 is a structural member made of heat-resistant steel to improve the overall heat resistance of the equipment and increase its service life.

[0030] In this embodiment, the central tube 11 includes a light tube and a fish scale hole tube 14, which are an integrated structural component. One end of the light tube is fixedly connected to the end plate 12, and the other end of the light tube is connected to the fish scale hole tube 14. The fish scale hole tube 14 extends the flow length of the gas inside and outside the tube, thereby extending the residence time of wood tar in the high temperature zone, which is beneficial to the cracking of wood tar.

[0031] Embodiment 2:

[0032] In this embodiment, a biomass gasifier, such as Figure 2 As shown, it includes a furnace body 15, a circulating air device and the above-mentioned cracking gasification generator. Specifically, the above-mentioned annular tubes 1 of the plurality of the above-mentioned cracking gasification generators are arranged in parallel and at intervals in the above-mentioned furnace body 15, the air inlet of the above-mentioned circulating air device is communicated with the furnace cavity of the above-mentioned furnace body 15, the air outlet of the above-mentioned circulating air device is communicated with the above-mentioned biomass gas inlet 2 of the above-mentioned annular tube 1, and the furnace wall of the above-mentioned furnace body 15 is provided with a plurality of vents 16, one end of the above-mentioned vent 16 is communicated with the above-mentioned high-temperature gas inlet 3 of the above-mentioned annular tube 1 at a corresponding position, and the other end of the above-mentioned vent 16 is communicated with an external burner.

[0033] By adopting this structure, the biomass gas with high wood tar content generated in the above-mentioned furnace body 15 is continuously fed into the above-mentioned pyrolysis gasification generator through the above-mentioned circulating air device, so that the wood tar is cracked to obtain high-temperature biomass gas with low wood tar content and is re-discharged into the above-mentioned furnace body 15, which in turn promotes the material in the above-mentioned furnace body 15 to generate new biomass gas, so that the cracking of wood tar and the generation of biomass gas are circulated, thereby increasing the biomass gas output and reducing the wood tar content.

[0034] In this embodiment, Figure 2 As shown, a feeding port 27 is provided on the top of the furnace body 15, and the biomass material fills the furnace body 15. A plurality of the pyrolysis gasification generators are installed in a vertical direction, and each of the pyrolysis gasification generators is fed with high-temperature gas through an external burner, so that the temperature of the pyrolysis gasification generator is increased, and then the materials around it are heated, so that all the materials in the furnace body 15 react to generate biomass gas at the same time, which is biomass gas with a high wood tar content at this time. The biomass gas is absorbed by the circulating air device and pumped into each of the pyrolysis gasification generators for wood tar cracking reaction to obtain biomass gas with a low wood tar content, and is re-discharged into the furnace body 15 through the air distribution holes 4. In this cycle, the wood tar in the biomass gas is repeatedly cracked many times, so that the wood tar content in the biomass gas is greatly reduced.

[0035] It is worth noting that by controlling the temperature of the above-mentioned circulating air device and the temperature of the biomass gas discharged into the above-mentioned furnace body 15, the biomass material in the above-mentioned furnace body 15 is reacted to obtain charcoal or activated carbon, and the charcoal or activated carbon can catalyze the cracking of wood tar. The water in the material and the carbon powder and other carrying materials in the charcoal or activated carbon are pumped into the above-mentioned cracking gasification generator together with the biomass gas by the above-mentioned circulating air device, further catalyzing the cracking process and efficiency of the wood tar. The bottom of the above-mentioned furnace body 15 is provided with a slag discharge port 28. After the reaction is completed, the charcoal or activated carbon can be discharged through the above-mentioned slag discharge port 28.

[0036] In this embodiment, Figure 2As shown, the above-mentioned circulating air device includes an exhaust pipe and a plurality of circulating fans 19. Specifically, the above-mentioned exhaust pipe is vertically arranged at the center of the above-mentioned furnace body 15, and the above-mentioned circulating fan 19 is installed in the above-mentioned furnace body 15. Each of the above-mentioned annular tubes 1 is correspondingly provided with one of the above-mentioned circulating fans 19. The pipe wall of the above-mentioned exhaust pipe is provided with a plurality of air inlet holes 20. The top of the above-mentioned exhaust pipe is provided with an air guide pipe. The air inlet of the above-mentioned circulating fan 19 is connected with the above-mentioned air guide pipe, and the air outlet of the above-mentioned circulating fan 19 is connected with the biomass gas inlet 2 of the above-mentioned annular tube 1 at the corresponding position. When in use, the above-mentioned circulating fan 19 is started to form a negative pressure in the above-mentioned exhaust pipe. , so that the biomass gas in the furnace body 15 is sucked into the exhaust pipe through the air inlet 20, and then enters the heat exchange chamber 5 of the annular tube 1 through the air guide pipe, the circulating fan 19 and the biomass gas inlet 2, so that the wood tar is cracked to form low-content biomass gas, and then is re-discharged into the furnace body 15 through the air distribution holes 4, the biomass material in the furnace body 15 is heated, and new biomass gas is continuously generated, and then it is continuously sucked into the pyrolysis gasification generator by the exhaust pipe for cracking reaction, cyclic cracking, and finally the wood tar content in the biomass gas in the furnace body 15 is minimized.

[0037] Further, such as Figure 2As shown, the exhaust pipe includes an inner pipe 17 and an outer pipe 18, the air guide pipe includes an inner air guide pipe 21 and an outer air guide pipe 22, an annular baffle 23 is provided in the middle of the outer pipe 18, the bottom of the inner pipe 17 is fixedly connected to the annular baffle 23, the inner air guide pipe 21 is connected to the inner pipe 17, and the outer air guide pipe 22 is connected to the outer pipe 18. In this way, the annular space between the inner pipe 17 and the outer pipe 18 is separated from the pipe hole of the outer pipe 18 below the annular baffle 23, and the space between the inner pipe 17 and the outer pipe 18 is The annular space absorbs the biomass gas in the upper half of the furnace body 15, and the space of the lower tube hole of the outer tube 18 absorbs the biomass gas in the lower half of the furnace body 15. The biomass material in the furnace body 15 will gradually carbonize and become smaller in volume as the reaction process proceeds. During the production process, new biomass material will be added to the furnace body 15 through the feeding port 27. As the production proceeds, the lower part of the furnace body 15 gradually becomes charcoal or activated carbon, and the upper part becomes the newly added biomass material, so that the lower half of the furnace body 15 The biomass gas inside the above-mentioned pyrolysis gasification generator is more thoroughly pyrolyzed, the wood tar content is lower near the bottom, and the wood tar content is higher near the top. By separating the annular space between the inner tube 17 and the outer tube 18 from the tube hole of the outer tube 18 below the annular baffle 23, the above-mentioned pyrolysis gasification generator in the lower half of the furnace body 15 only draws and circulates the biomass gas in the lower half of the furnace body 15, and the above-mentioned pyrolysis gasification generator in the upper half of the furnace body 15 only draws and circulates the biomass gas in the upper half of the furnace body 15. At the same time, Under the action of gravity, the biomass gas in the upper part will also slowly flow to the lower part of the above-mentioned furnace body 15, so that the biomass gas in the above-mentioned furnace body 15 can be separated and purified. The lower the biomass gas is below the above-mentioned furnace body 15, the lower the wood tar concentration contained in it. As an optimization, the side wall of the above-mentioned furnace body 15 is provided with an exhaust pipe 29. The above-mentioned exhaust pipe 29 is located below all the above-mentioned pyrolysis gasification generators. During the production process, the biomass gas with a wood tar concentration that meets the standard can be extracted and can be directly used for industrial production without the need for complicated post-processing procedures for wood tar.

[0038] As an optimization, an inclined baffle 24 is also included. Each of the above-mentioned air inlet holes 20 is provided with the above-mentioned inclined baffle 24. The above-mentioned inclined baffle 24 allows the biomass gas in the area between two adjacent above-mentioned pyrolysis gasification generators to form a small circulation, and also facilitates the reaction of biomass materials, charcoal, and activated carbon to move from top to bottom.

[0039] In this embodiment, Figure 2 As shown, it also includes a rotating chain ring 25 and an anchor 26. The rotating chain ring 25 is arranged in the furnace body 15, and at least two anchors 26 are hung on the rotating chain ring 25. The rotating chain ring 25 is driven to rotate by a motor, driving the anchor 26 to move horizontally in a circular motion, thereby smoothing the surface of the material.

[0040] Compared with the prior art, the gas production rate of the present invention is fast, wood tar cracking and catalytic cracking are carried out in the cracking gasification generator in the furnace, it is easier to control the depth of the reaction, the wood tar is decomposed more thoroughly, the wood tar content of the biomass gas discharged from the furnace is low, and no complicated purification treatment outside the furnace is required to meet the production needs. The solid product after the material reaction is equivalent to the external heating dry distillation product, and the carbonization-activation process can be realized without the need for external gasification agent (such as superheated water steam). According to different operating parameters, the solid product is carbon-based fertilizer or biomass charcoal or activated carbon, and the activated carbon yield is relatively high. Compared with the fluidized bed, which requires heavy medium heat storage to maintain a stable furnace temperature and the fluidized state requires more power energy consumption, this furnace type only consumes less fluidized power energy. Under the same furnace bottom area conditions, the gasification intensity is much higher than that of various fixed beds.

[0041] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A pyrolysis gasification generator, characterized in that: The invention comprises an annular tube (1), wherein the annular tube (1) is provided with a biomass gas inlet (2), a high-temperature gas inlet (3) and gas distribution holes (4); a heat exchange chamber (5) and a mixed flow chamber (6) are provided in the annular tube (1); a flow guiding heat exchange channel (9) and a heating channel (7) are provided in the heat exchange chamber (5); one end of the flow guiding heat exchange channel (9) is connected to the biomass gas inlet (2) and the other end is connected to the mixed flow chamber (6); one end of the heating channel (7) is connected to the high-temperature gas inlet (3) and the other end is connected to the mixed flow chamber (6); the gas distribution holes (4) are arranged on the chamber wall of the mixed flow chamber (6).

2. A pyrolysis gasification generator according to claim 1, characterized in that: The invention also comprises a flow guide tube (10) and a central tube (11); an end plate (12) and an annular plate (13) are arranged in the annular tube (1); the annular tube (1) is divided into the heat exchange chamber (5) and the mixed flow chamber (6) by the end plate (12) and the annular plate (13); the flow guide tube (10) and the central tube (11) are arranged in the heat exchange chamber (5); one end of the central tube (11) is fixedly connected to the end plate (12) and the other end is connected to the mixed flow chamber (6), one end of the flow guide tube (10) is fixedly connected to the ring plate (13) and the other end is sleeved outside the central tube (11); the flow guide and heat exchange channel (9) comprises a flow guide channel (8) and a heat exchange channel (9); the flow guide channel (8) is between the flow guide tube (10) and the ring tube (1); the heat exchange channel (9) is between the flow guide tube (10) and the central tube (11); and the tube hole of the central tube (11) is the heating channel (7).

3. A pyrolysis gasification generator according to claim 2, characterized in that: The central tube (11) comprises a light tube and a fish scale hole tube (14), wherein the light tube and the fish scale hole tube (14) are an integrated structural component, one end of the light tube is fixedly connected to the end plate (12), and the other end of the light tube is connected to the fish scale hole tube (14).

4. A pyrolysis gasification generator according to claim 2, characterized in that: The flow guide tube (10) is a structural component made of a high temperature resistant composite material.

5. A pyrolysis gasification generator according to claim 2, characterized in that: The annular tube (1) is a structural component made of heat-resistant steel.

6. A biomass gasifier, characterized in that: The invention comprises a furnace body (15), a circulating air device and a cracking gasification generator according to any one of claims 1 to 5, wherein a plurality of annular tubes (1) of the cracking gasification generator are arranged in parallel and at intervals in the furnace body (15), an air inlet of the circulating air device is communicated with a furnace cavity of the furnace body (15), an air outlet of the circulating air device is communicated with a biomass gas inlet (2) of the annular tube (1), a furnace wall of the furnace body (15) is provided with a plurality of vents (16), one end of the vent (16) is communicated with a high-temperature gas inlet (3) of the annular tube (1) at a corresponding position, and the other end of the vent (16) is communicated with an external burner.

7. The biomass gasifier according to claim 6, characterized in that: The circulating air device comprises an exhaust pipe and a plurality of circulating fans (19), wherein the exhaust pipe is vertically arranged at the center of the furnace body (15), a plurality of air inlet holes (20) are arranged on the pipe wall of the exhaust pipe, an air guide pipe is arranged on the top of the exhaust pipe, the air inlets of the circulating fans (19) are all connected to the air guide pipe, and the air outlets of the circulating fans (19) are connected to the biomass gas inlet (2) of the annular pipe (1) at the corresponding position.

8. The biomass gasifier according to claim 7, characterized in that: The exhaust pipe comprises an inner pipe (17) and an outer pipe (18); the air guide pipe comprises an inner air guide pipe (21) and an outer air guide pipe (22); an annular baffle plate (23) is provided in the middle of the outer pipe (18); the bottom of the inner pipe (17) is fixedly connected to the annular baffle plate (23); the inner air guide pipe (21) is in communication with the inner pipe (17); and the outer air guide pipe (22) is in communication with the outer pipe (18).

9. The biomass gasifier according to claim 7, characterized in that: It also includes an inclined baffle (24), and the inclined baffle (24) is provided above each of the air inlet holes (20).

10. The biomass gasifier according to claim 7, characterized in that: It also comprises a rotating chain ring (25) and an iron anchor (26), wherein the rotating chain ring (25) is arranged in the furnace body (15), and at least two of the iron anchors (26) are hung on the rotating chain ring (25).

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