Gasification device and biomass conversion system

Abstract

The utility model relates to a gasification device and a biomass conversion system, and is applied to the field of biomass gasification. The dry distillation device comprises at least two dry distillation pipes which are arranged in parallel, a fuel gas channel and a flue gas channel, and the dry distillation pipes are used for filling biomass raw materials for gasification operation; the fuel gas channels are connected between the adjacent dry distillation pipes in an abutting mode, the output ends of the dry distillation pipes are communicated with the combustion device and / or the collecting device through the fuel gas channels, and the fuel gas channels are used for allowing gas to flow through so as to heat the dry distillation pipes; the flue gas channel covers the peripheries of the dry distillation pipe and the fuel gas channel, and flue gas flows through the flue gas channel so as to heat the dry distillation pipe and the gasified gas. The biomass conversion system integrates the functions of drying, pyrolysis and gasification, and is high in heat efficiency and compact in structure. In addition, the biomass conversion system also adopts a composite heat supply mode that external high-temperature flue gas heating and internal high-temperature gasified gas waste heat heating are simultaneously carried out to jointly provide heat required by gasification, so that the gasified gas waste heat is fully utilized, the heat loss is reduced, and the energy utilization efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of biomass gasification, and in particular to a gasification device and a biomass conversion system. Background Art

[0002] Biomass refers to various organisms formed through photosynthesis, including all plants, animals and microorganisms. It is the energy form of solar energy stored in biomass in the form of chemical energy. It has always been one of the important energy sources for human survival. Biomass is the fourth largest energy source after coal, oil and natural gas, and occupies an important position in the entire energy system.

[0003] In the related technologies, biomass gasification is a thermochemical reaction that uses oxygen or oxygen-containing substances in the air as a gasifying agent to convert the combustible part of biomass fuel into combustible gas under high temperature conditions. Biomass gasification technology plays a positive role in treating a large amount of crop waste, reducing environmental pollution, and improving people's living standards. However, in the process of biomass gasification, the effect of recovering the waste heat from the tail gas of the gasification generator set is poor, which can easily lead to low efficiency of the entire system. Utility Model Content

[0004] Based on this, it is necessary to provide a biomass conversion system and method to address the problem of low gasification efficiency in the above-mentioned biomass gasification technology.

[0005] In a first aspect, the present application provides a gasification device, which adopts the following technical solution:

[0006] A gasification device comprises at least two dry distillation tubes, a gas channel and a smoke channel, wherein all the dry distillation tubes are arranged in parallel with each other, and the dry distillation tubes are used for being filled with biomass raw materials for gasification operation; the gas channel abuts between adjacent dry distillation tubes, and the gas channel can connect the output end of the dry distillation tube to a combustion device and / or a collection device, and the gas channel is used for gasification gas to flow through so as to heat the dry distillation tube; the smoke channel covers the periphery of the dry distillation tube and the gas channel, and the smoke channel is used for flue gas to flow through so as to heat the dry distillation tube and the gasification gas.

[0007] In one embodiment, the gasification device further comprises an air supply wall and a water vapor supply wall arranged at intervals along the longitudinal direction of the distillation tube, and the air supply wall and the water vapor supply wall are both connected to the distillation tube; wherein the air supply wall is used to supply air into the distillation tube; and the water vapor supply wall is used to supply water vapor into the distillation tube.

[0008] In one embodiment, the flue gas channel is arranged in a spiral shape around a first reference axis, and the first reference axis is parallel to the central axis of the distillation tube.

[0009] In a second aspect, the present application provides a biomass conversion system, which adopts the following technical solution:

[0010] A biomass conversion system comprises the above-mentioned gasification device, combustion device and collection device, wherein the gasification device is used to heat biomass raw materials to produce gasification gas and solid residue, and the gasification device can reduce the temperature gradient between biomass raw materials; the output end of the combustion device is connected to the first input end of the gasification device, and is used to supply heat to the gasification device; the input end of the collection device is connected to the first output end of the output end of the gasification device, and the collection device comprises a gas collecting end and a return end, the gas collecting end is used to collect the generated gasification gas, and the return end is connected to the input end of the combustion device.

[0011] In one embodiment, the collecting device includes a separation mechanism and a gas collecting mechanism, the separation mechanism is connected to the first output end of the gasification device, the gas collecting mechanism is connected to the output end of the separation mechanism, the separation mechanism is used to separate the gasified gas, and the gas collecting mechanism is used to collect the separated gasified gas.

[0012] In one embodiment, the separation mechanism includes a gas-carbon separation component and a gas-liquid separation component, the gas-carbon separation component is connected to the first output end of the gasification device, and the gas-liquid separation component is connected between the gas-carbon separation component and the gas collecting mechanism; wherein the gas-carbon separation component is used to separate the generated gasification gas and solid residue; and the gas-liquid separation component is used to separate the liquid in the gasification gas.

[0013] In one embodiment, the separation mechanism further includes a non-return component, which is connected between the gas-carbon separation component and the gas-liquid separation component to prevent the gasification gas from being fed back from the gas-liquid separation component to the gas-carbon separation component.

[0014] In one embodiment, the conversion system further includes a waste discharge device, the input end of the waste discharge device is connected to the second output end of the gasification device, and the output end of the waste discharge device is used to connect to the outside to discharge the flue gas generated during the gasification process.

[0015] In one embodiment, the conversion system further includes a monitoring device for monitoring the temperature inside the gasification device; wherein, along the conveying direction of the biomass raw material, the gasification device includes a drying section, a pyrolysis section and a gasification section arranged in sequence, and the monitoring device includes a first monitor arranged corresponding to the drying section, a second monitor arranged corresponding to the hot stage and a third monitor arranged corresponding to the gasification section.

[0016] In one of the embodiments, the conversion system further includes a feeding device, which is connected to the second input end of the gasification device, and is used to transport biomass raw materials to the dry distillation tube.

[0017] The above-mentioned gasification device adopts a composite heating method of simultaneously performing external high-temperature flue gas heating and internal high-temperature gasification gas waste heat heating, which jointly provides the heat required for the gasification process, fully utilizes the waste heat of the gasification gas, reduces heat loss, and thus improves energy utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the structure of a gasification device in one embodiment of the present application.

[0019] Figure 2 Schematic diagram of the composition structure of a biomass conversion system in one embodiment of the present application.

[0020] Notes on the attached drawings:

[0021] 1. Gasification device; 11. Drying pipe; 12. Smoke channel; 13. Gas channel; 14. Air supply wall; 15. Water vapor supply wall; 16. Gas pipeline sealing plate; 2. Combustion device; 3. Collecting device; 31. Separation mechanism; 311. Gas-carbon separation component; 312. Gas-liquid separation component; 313. Check component; 32. Gas collecting mechanism; 4. Waste discharge device; 6. Feeding device; 7. Gas collecting end; 8. Return end; I1, first input end; I2, second input end; O1, first output end; O2, second output end. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0023] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply 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 a limitation on the present application.

[0024] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0025] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated 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, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0026] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0027] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0028] Biomass refers to various organisms formed through photosynthesis, including all plants, animals and microorganisms. It is the energy form of solar energy stored in biomass in the form of chemical energy. It has always been one of the important energy sources for human survival. Biomass is the fourth largest energy source after coal, oil and natural gas, and occupies an important position in the entire energy system.

[0029] In the related art, biomass gasification gas refers to heating biomass raw materials under oxygen-deficient conditions, so that the high molecular weight organic hydrocarbons cracked at high temperature react with gasifying agents to generate low molecular weight carbon monoxide, hydrogen, methane, carbon dioxide, nitrogen and other mixed gases. The gas composition and properties of different biomass gasification gases, such as combustion speed, flame propagation speed, reaction zone structure, etc., vary greatly due to the differences in biomass raw materials and gasification processes.

[0030] Biomass gasification plays a positive role in treating a large amount of crop waste, reducing environmental pollution, and improving people's living standards. However, in the process of biomass gasification, there are still certain defects in the waste heat recovery effect of the tail gas of the gasification device, which can easily lead to a decrease in the gasification efficiency and energy utilization rate of the entire gas. In order to solve the above problems, this application designs a new gasification device to improve the efficiency of biomass gasification. Figure 1-2 The embodiments of the present application are described in further detail.

[0031] See also Figure 1 , Figure 1 A schematic structural diagram of a gasification device in an embodiment of the present application is shown. An embodiment of the present application provides a gasification device 1, specifically a double-distillation tube gasifier, the gasification device 1 includes at least two distillation tubes 11 distributed at intervals, the distillation tubes 11 are used for biomass raw materials to be filled for gasification process, thereby converting the biomass raw materials into gasification gas and solid residue.

[0032] In the embodiment of the present application, the main component of the solid residue is carbon, which can be directly discharged and made into an adsorbent, activated carbon or soil conditioner.

[0033] It is understandable that in some other embodiments, the number of distillation tubes 11 can be set to be greater to increase the total amount of biomass raw materials input into the gasification device 1 at a single time, thereby increasing the biomass raw material processing capacity of the gasification device 1 per unit time, and further improving the working efficiency of the gasification device 1.

[0034] Specifically, the gasification device 1 further includes a gas channel 13 connected to the distillation tube 11. The gas channel 13 is formed by surrounding each distillation tube 11. The gas channel 13 can connect the distillation tube 11 to the combustion device 2 and / or the collection device 3 to output the gasified gas generated by gasification in the distillation tube 11. During the transmission of the gasified gas, the high-temperature gasified gas continuously heats the inner side of the distillation tube 11 to achieve effective utilization of the residual temperature of the gasified gas.

[0035] In some embodiments, in order to improve the utilization rate of the flue gas waste heat in the gasification device 1, the gasification device 1 further includes a flue gas channel 12 covering the periphery of the carbonization tube 11, and the flue gas channel 12 is connected to the above-mentioned combustion device 2. During the actual conversion process, the high-temperature flue gas generated by the combustion of the combustible gas in the combustion device 2 is transmitted to the flue gas channel 12, and the high-temperature flue gas can further heat the carbonization tube 11 to provide the heat required for the gasification of the biomass raw material, thereby realizing secondary heating of the outer side of the carbonization tube 11.

[0036] In the embodiment of the present application, the gasification device 1 improves the conversion efficiency of biomass raw materials by reducing the temperature gradient between biomass. In addition, the gasification device 1 of the present application adopts a composite heating method of simultaneously burning and heating external high-temperature flue gas and internal combustible gas to provide the heat required for gasification of biomass raw materials, making full use of the waste heat of gasification gas, reducing heat loss in the gasification process, and improving energy efficiency.

[0037] In some embodiments, in order to further improve the utilization rate of the gasification gas and the flue gas waste heat, the present application also specially designs the shape of the flue gas channel 12. In the embodiment of the present application, the flue gas channel 12 is configured to be arranged in a spiral shape along the first reference axis, so that after the high-temperature flue gas enters the flue gas channel 12, it can flow along the outer wall of the distillation tube 11 along a spiral path, thereby extending the contact time between the high-temperature flue gas and the outer wall of the distillation tube 11, thereby further improving the utilization rate of the gasification gas and the flue gas waste heat.

[0038] Continue reading Figure 1 In some embodiments, from the input end to the output end of the distillation tube 11, the distillation tube 11 includes a drying zone, a pyrolysis zone, an oxidation zone and a reduction zone arranged in sequence. During the conversion process, the biomass raw material is gradually advanced from the drying zone to the reduction zone to gradually perform a gasification operation.

[0039] Specifically, the gasification device 1 also includes an air supply wall 14 and a water vapor supply wall 15 arranged at intervals along the longitudinal direction of the distillation tube 11, and the air supply wall 14 and the water vapor supply wall 15 are both connected to the distillation tube 11. Among them, the air supply wall 14 is used to transport a certain amount of air into the distillation tube 11, so that the biomass raw material is partially burned, and high temperature conditions are provided for the catalytic cracking of the tar produced in the pyrolysis zone and the water gas reaction. The water required for the water gas reaction is introduced into the distillation tube 11 through the above-mentioned water vapor supply wall 15 to ensure the normal operation of the gasification operation.

[0040] Combination Figure 2 As shown, Figure 2 A schematic diagram of the composition structure of a biomass conversion system in an embodiment of the present application is shown. In some embodiments, the biomass conversion system includes a combustion device 2, a collection device 3, and a gasification device 1 as shown in any of the above embodiments.

[0041] The gasification device 1 includes a first input end I1, and the output end of the combustion device 2 is connected to the first input end I1 of the gasification device 1, so as to deliver high-temperature flue gas to the flue gas channel 12 of the gasification device 1, thereby realizing the heating operation of the outer side of the carbonization tube 11. The input end of the collection device 3 is connected to the first output end O1 of the gasification device 1, so as to realize the recovery and utilization of the gasification gas generated by the gasification operation.

[0042] The collecting device 3 includes a gas collecting end 7 and a return end 8 which are arranged at intervals. The gas collecting end 7 is used to collect and store the generated gasification gas, and the return end 8 is used to connect to the input end of the combustion device 2, so as to return part of the generated gasification gas to the combustion device 2 to assist the combustion heating of the combustion device 2.

[0043] In some embodiments, the biomass conversion system further comprises a feeding device 6, the output end of which is connected to the second input end I2 of the gasification device 1, so as to continuously input biomass raw materials into the dry distillation tube 11 of the feeding device 6. In the embodiment of the present application, the feeding device 6 is specifically a hydraulic feeding device capable of realizing rapid and continuous feeding.

[0044] Continue reading Figure 2 As shown, in some embodiments, the collecting device 3 specifically includes a separation mechanism 31 and a gas collecting mechanism 32. The separation mechanism 31 is connected between the above-mentioned gasification device 1 and the gas collecting mechanism 32 to filter impurities entrained in the gasified gas, thereby purifying the gasified gas collected by the gas collecting mechanism 32.

[0045] Specifically, the separation mechanism 31 includes a gas-carbon separation component 311 and a gas-liquid separation component 312 connected in sequence. The input end of the gas-carbon separation component 311 is connected to the first output end O1 of the gasification device 1, so as to separate the solid residue generated after the biomass raw material undergoes the gasification process from the gasification gas. The gas-carbon separation component 311 includes a discharge port, and the solid residue is regularly discharged through the discharge port after accumulating to a certain amount, so that the solid residue is discharged from the biomass conversion system as a final product.

[0046] The input end of the gas-liquid separation component 312 is connected to the output end of the gas-carbon separation component 311. There may be some liquid residue in the gasified gas after preliminary filtration treatment. The gas-liquid separation component 312 is used to separate the liquid in the gasified gas so that the gas collecting mechanism 32 can collect gasified gas with higher purity.

[0047] Furthermore, in order to achieve effective control of the gasification gas flow direction, in some embodiments, the separation mechanism 31 further includes a check assembly 313 connected between the gas-carbon separation assembly 311 and the gas-liquid separation assembly 312. In the embodiment of the present application, the check assembly 313 is specifically a one-way valve connected between the gas-carbon separation assembly 311 and the gas-liquid separation assembly 312. In the actual preparation process, the gasification gas can only flow from the gas-carbon separation assembly 311 to the gas-liquid separation assembly 312 under the action of the one-way valve, thereby further ensuring the purity of the gasification gas collected by the gas collection mechanism 32.

[0048] See also Figure 2 As shown, in some embodiments, the biomass conversion system further includes a waste discharge device 4, the input end of which is connected to the second output end O2 of the gasification device 1. Specifically, the waste discharge device 4 is an induced draft fan whose input end is connected to the output end of the flue gas channel 12.

[0049] In the embodiment of the present application, the induced draft fan is used to discharge the flue gas that has absorbed the excess heat out of the conversion system, which completes the waste discharge operation on the one hand, so that the cleanliness inside the conversion system is guaranteed. On the other hand, the setting of the induced draft fan guides the flow of the flue gas, so that the high-temperature flue gas can be smoothly transmitted from the input end of the flue gas channel 12 to the output end of the flue gas channel 12 under the traction of the induced draft fan, thereby achieving the overall heating of the outer wall of the distillation tube 11.

[0050] In some other embodiments, the biomass conversion system further includes a monitoring device, which is used to monitor the temperature inside the gasification device 1 in real time, and to achieve real-time regulation of the operating state of the biomass conversion system according to the temperature data obtained through monitoring.

[0051] In the embodiment of the present application, the monitoring device includes a first monitor, a second monitor and a third monitor arranged at intervals, and the first monitor, the second monitor and the third monitor are all common thermocouples. Specifically, along the longitudinal direction of the gasification device 1, the gasification device 1 includes a drying section, a pyrolysis section and a gasification section arranged in sequence, the drying section is located at the raw material inlet of the gasification device 1, the pyrolysis section is located in the middle of the gasification device 1, and the gasification section is located at the end of the gasification device 1.

[0052] The drying section corresponds to the drying area of ​​the above-mentioned distillation tube 11, the pyrolysis section corresponds to the pyrolysis section of the distillation tube 11, and the gasification section corresponds to the oxidation section and the reduction section of the distillation tube 11. The above-mentioned first monitor, second monitor and third monitor are arranged corresponding to the drying section, pyrolysis section and gasification section of the gasification device 1 in sequence, so as to monitor the temperatures of the three sections in sections and in real time.

[0053] During the actual conversion process, the feeding device 6 pushes the biomass raw material into the double distillation tube 11, and feeds it repeatedly and continuously. The high-temperature flue gas generated by burning the gasification gas in the combustion device 2 heats the outside of the distillation tube 11 through the spiral flue gas duct. The waste heat of the gasification gas generated after the gasification reaction in the gasification device 1 circulates in the gas flow to heat the inside of the distillation tube 11.

[0054] Specifically, the biomass raw material is gradually pushed forward, gradually passing through the drying zone, pyrolysis zone, oxidation zone and reduction zone in sequence, during which a certain amount of air is supplied to the dry distillation tube 11 through the air supply wall 14, and partial combustion occurs, providing high temperature conditions for the catalytic cracking of the tar produced in the pyrolysis zone and the water gas reaction. The water required for the water gas reaction is introduced through the water vapor supply wall 15, and the generated gasification gas and solid residue are separated in the gas-carbon separation component 311, and the solid residue falls and is discharged regularly. The generated gasification gas is discharged through the gas channel 13.

[0055] The gas channel 13 is surrounded by the above-mentioned distillation tube 11 and two upper and lower gas pipeline sealing plates 16. When the gas is discharged through the gas channel 13, it also plays a role of heating the distillation tube 11 to cool itself.

[0056] In some embodiments, the present application further provides a conversion method, which can be applied to the conversion system shown in any of the above embodiments to achieve the conversion operation of biomass raw materials, and the conversion method comprises the following steps:

[0057] S101: heating the gasification device 1;

[0058] S102: When the temperature of the drying section of the gasification device 1 reaches a preset value, biomass raw materials are loaded into the gasification device 1;

[0059] S103: The biomass raw material is heated to generate gasification gas, a part of which is transported to the combustion furnace, and the other part is transported to the collection device 3.

[0060] In step S101, the combustible gas is ignited in the combustion device 2, and the combustible gas is burned to generate high-temperature flue gas, which is transported to the periphery of the carbonization tube 11 through the flue gas channel 12, thereby realizing the heating operation of the gasification device 1. The combustible gas can be liquefied gas or gasified gas. At the beginning of the gasification operation, the combustible gas is usually liquefied gas. After the gasification operation has been carried out for a period of time, that is, after the biomass raw material has produced a certain amount of gasified gas under the gasification effect, the liquefied gas is replaced by the gasified gas, and the heating of the gasification device 1 continues.

[0061] In step S102, the temperature values ​​monitored at the first monitor, the second monitor, and the third monitor are read respectively. When the temperature at the first monitor reaches the preset temperature, the feed device 6 is started to push the biomass raw material into the gasification device 1. In the embodiment of the present application, the preset temperature is set to 200° C. It can be understood that in some other embodiments, the preset temperature can be flexibly designed according to the actual performance of the gasification device 1, and the present application does not limit this.

[0062] In step S103, water vapor is used as a gasifying agent, and the high-temperature flue gas in the combustion device 2 is used as a heat source. The biomass raw material is dried, pyrolyzed and gasified in the gasification device 1 to produce gasification gas and solid residue. The gasification gas and the solid residue are separated in the gas-carbon separation component 311. A part of the gasification gas is transported to the combustion device 2 for combustion, and the other part enters the gas-liquid separation component 312, where the liquid in the gasification gas is separated and collected by the gas collecting mechanism 32. The remaining solid residue can be transported to the outside as the final product.

[0063] Before step S101 , the method further includes step S100 : starting the waste discharge device 4 and adjusting the operation rate of the waste discharge device 4 , so as to discharge the flue gas out of the gasification device 1 .

[0064] In step S100, before starting the combustion device 2, the operation rate of the exhaust device 4 is adjusted so that the high-temperature flue gas generated by the combustion device 2 can pass through the flue gas channel 12 at a specific rate under the traction of the induced draft fan, thereby ensuring the heating effect on the outside of the dry distillation tube 11. The flue gas after the residual heat is absorbed is led out of the conversion system by the exhaust device 4, so that the cleanliness of the inside of the conversion system is guaranteed.

[0065] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A gasification device, characterized in that: The gasification device comprises: At least two dry distillation tubes, all of which are arranged parallel to each other, and are used for being filled with biomass raw materials for gasification operation; a gas channel abutting between the adjacent distillation tubes, the gas channel being capable of connecting the output end of the distillation tube to a combustion device and / or a collection device, the gas channel being used for gasification gas to flow through so as to heat the distillation tube; and A flue gas channel is coated on the periphery of the dry distillation tube and the fuel gas channel, and the flue gas channel is used for allowing flue gas to flow through so as to heat the dry distillation tube and the gasification gas.

2. The gasification device according to claim 1, characterized in that: The gasification device further comprises an air supply wall and a water vapor supply wall arranged at intervals along the longitudinal direction of the dry distillation tube, and the air supply wall and the water vapor supply wall are both connected to the dry distillation tube; The air supply wall is used to supply air into the dry distillation tube; the water vapor supply wall is used to supply water vapor into the dry distillation tube.

3. The gasification device according to claim 1, characterized in that: The flue gas channel is arranged in a spiral shape around a first reference axis, and the first reference axis is parallel to the central axis of the distillation tube.

4. A biomass conversion system, characterized in that: The transformation system comprises: The gasification device according to any one of claims 1 to 3, used for heating biomass raw materials to produce gasification gas and solid residue, wherein the gasification device is capable of reducing the temperature gradient between the biomass raw materials; a combustion device, wherein an output end of the combustion device is connected to a first input end of the gasification device for providing heat to the gasification device; and A collecting device, wherein the input end of the collecting device is connected to the first output end of the gasification device, and the collecting device comprises a gas collecting end and a return end, wherein the gas collecting end is used to collect the generated gasification gas, and the return end is connected to the input end of the combustion device.

5. The biomass conversion system according to claim 4, characterized in that: The collecting device comprises a separation mechanism and a gas collecting mechanism, wherein the separation mechanism is connected to the first output end of the gasification device, and the gas collecting mechanism is connected to the output end of the separation mechanism, the separation mechanism is used to separate the gasified gas, and the gas collecting mechanism is used to collect the separated gasified gas.

6. The biomass conversion system according to claim 5, characterized in that: The separation mechanism comprises a gas-carbon separation component and a gas-liquid separation component, the gas-carbon separation component is connected to the first output end of the gasification device, and the gas-liquid separation component is connected between the gas-carbon separation component and the gas collection mechanism; The gas-carbon separation component is used to separate the generated gasification gas and solid residue; the gas-liquid separation component is used to separate the liquid in the gasification gas.

7. The biomass conversion system according to claim 6, characterized in that: The separation mechanism further includes a non-return component, which is connected between the gas-carbon separation component and the gas-liquid separation component to prevent the gasification gas from being fed back from the gas-liquid separation component to the gas-carbon separation component.

8. The biomass conversion system according to claim 4, characterized in that: The conversion system further comprises a waste discharge device, the input end of which is connected to the second output end of the gasification device, and the output end of which is used to be connected to the outside to discharge the flue gas generated during the gasification process.

9. The biomass conversion system according to claim 4, characterized in that: The conversion system further comprises a monitoring device, wherein the monitoring device is used to monitor the temperature inside the gasification device; Among them, along the conveying direction of the biomass raw materials, the gasification device includes a drying section, a pyrolysis section and a gasification section arranged in sequence, and the monitoring device includes a first monitor arranged corresponding to the drying section, a second monitor arranged corresponding to the pyrolysis section and a third monitor arranged corresponding to the gasification section.

10. The biomass conversion system according to claim 4, characterized in that: The conversion system further comprises a feeding device, which is connected to the second input end of the gasification device and is used for conveying biomass raw materials to the dry distillation tube.

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