Biomass gasification system and biomass gasification method

Abstract

The invention provides a biomass gasification system and a biomass gasification method, and the method comprises the following steps: a heat supply and decomposition step: calcium-based thermochemical heat storage particles receive heat energy provided by an external heat source and decompose the heat energy; a second gas-solid separation step: carrying out gas-solid separation on a second mixture obtained in the heat supply and decomposition step, and enabling a separated solid decomposition product to enter a biomass gasification furnace through a decomposition product inlet; gasification and synthesis: biomass in the biomass gasification furnace receives heat of the solid decomposer to be gasified to generate synthesis gas, and the solid decomposer reacts with the synthesis gas to obtain a solid composition; a first gas-solid separation step: carrying out gas-solid separation on the first mixture obtained in the gasification and synthesis step, and feeding the separated solid composition into a decomposition reactor; a gas supplementing step: supplementing gas into the biomass gasification furnace; and a synthesis gas storage step. Biomass combustion in the traditional self-heating type biomass process is avoided, the gasification efficiency is improved, and CO2 emission is reduced.

Description

Technical Field

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

[0002] At present, biomass resources are abundant, and the development of efficient utilization technology of biomass resources can reduce the use of fossil energy and reduce carbon emissions. Among the many biomass utilization technologies, biomass gasification technology has advantages over other biomass utilization technologies, such as high technical maturity, rich gasification products, and mature commercial applications. It has been widely studied and applied in developed countries in Europe and the United States.

[0003] The heat required for the traditional natural biomass gasification process is provided by the combustion of part of the biomass, and the balance of the combustion and gasification process is controlled by blowing in air or oxygen. However, the combustion process of biomass will produce pollutants such as nitrogen oxides and sulfides, which will reduce the gas production efficiency of the gasification process and the calorific value of the syngas. It is also difficult to achieve the low-carbon and high-efficiency development of biomass gasification technology. Summary of the invention

[0004] In view of the above problems, the present invention provides a biomass gasification system and a biomass gasification method, which utilizes an external heat source to supplement the heat required for biomass gasification, thereby avoiding biomass combustion for heat supply and improving biomass gasification efficiency. At the same time, calcium-based thermochemical heat storage materials are selected as the heat transfer medium and CO in the biomass cyclic gasification process. 2 Adsorption materials can fully introduce the heat energy of external heat sources into the biomass gasifier and absorb CO in the gasification products. 2 , promoting the generation of high calorific value syngas and reducing CO 2 The calcium-based thermochemical heat storage particles are recycled during the gasification process to reduce emissions.

[0005] The present invention provides a biomass gasification system, comprising:

[0006] The biomass gasifier is used to provide a place for pyrolysis and gasification of biomass. The biomass gasifier includes a biomass inlet; a first mixture outlet for discharging a first mixture in the biomass gasifier, wherein the first mixture includes a solid synthetic material and synthetic gas generated by gasification; a decomposed material inlet, and a gas supply port;

[0007] A decomposition reactor driven by an external heat source, the decomposition reactor is a place where calcium-based thermochemical heat storage particles and coke are decomposed, and the external heat source provides the heat energy required for the decomposition of the calcium-based thermochemical heat storage particles and coke; the decomposition reactor has a second mixture outlet and a synthetic product inlet, and the second mixture outlet is used to discharge the second mixture in the decomposition reactor, and the second mixture includes solid decomposition products obtained by decomposing the calcium-based thermochemical heat storage particles and high-temperature carbon dioxide;

[0008] The first gas-solid separator comprises a first mixture inlet, which is connected to the first mixture outlet; a first gas outlet, which is used to discharge synthesis gas; and a first solid outlet, which is connected to the composition inlet. After the solid composition in the first mixture is separated by the first gas-solid separator, it enters the decomposition reactor through the composition inlet, and the solid composition serves as a reactant for decomposition in the decomposition reactor;

[0009] The second gas-solid separator comprises a second mixture inlet, which is connected to the second mixture outlet; a second gas outlet, which is used to discharge high-temperature carbon dioxide; and a second solid outlet, which is connected to the decomposition product inlet. After the solid decomposition products in the second mixture are separated by the second gas-solid separator, they enter the biomass gasifier through the decomposition product inlet. The solid decomposition products are used to provide heat energy required for biomass gasification. The solid decomposition products react with the synthesis gas generated by biomass gasification to obtain a solid synthesis product.

[0010] A gas source is used to provide the gas required for biomass gasification to the biomass gasifier, and the outlet of the gas source is connected to the gas supply port;

[0011] The synthesis gas storage tank is connected to the first gas outlet and the second gas outlet.

[0012] According to the technical solution, calcium-based thermochemical heat storage materials are used as heat transfer media, specifically, a decomposition reactor driven by an external heat source converts CaCO 3 Calcination into high temperature calcium oxide (solid decomposition product) and high temperature CO 2 Then the second mixture (mainly containing high-temperature calcium oxide, CO 2 ) After separation by the second gas-solid separator, the separated solid component - high-temperature calcium oxide enters the biomass gasifier. The gas source (air or water vapor or pure oxygen) is introduced into the biomass gasifier to fluidize the biomass and participate in the pyrolysis and gasification of the biomass. The high-temperature calcium oxide transfers heat to the biomass and the introduced gas to promote the pyrolysis and gasification of the biomass.

[0013] In the biomass gasifier, calcium oxide reacts with CO produced during the biomass gasification process. 2 The reaction produces CaCO 3 , which can further release chemical heat, maintain the heat required for the gasification process, and promote the generation of high calorific value synthesis gas (in a reversible reaction, by consuming the product, the reaction proceeds in the direction of generating the product, thereby promoting the generation of high calorific value synthesis gas (H 2 , CO, CH 4)). The first mixture at the outlet of the biomass gasifier (including solid components (coke, ash, solid composition (calcium carbonate)) and gas components) is separated into gas and solid by the first gas-solid separator, and the solid components enter the decomposition reactor driven by the external heat source, and calcium carbonate is used as the main reactant of the decomposition reaction. No combustion of biomass and oxygen occurs in the biomass gasifier to provide heat, thereby reducing the generation of pollutants such as nitrogen oxides or sulfur oxides.

[0014] In the decomposition reactor driven by an external heat source, the coke from the first solid outlet is burned in the decomposition reactor to produce CO 2 and heat, which provides part of the CaCO 3 Calcination and decomposition produce calcium oxide (solid decomposition product), and the additional heat lacking in calcination and decomposition is supplemented by an external heat source.

[0015] The gas separated by the first gas-solid separator and the second gas-solid separator enters the synthesis gas storage tank for storage.

[0016] The main chemical reactions occurring in the biomass gasifier are as follows:

[0017]

[0018] The main chemical reactions occurring in the decomposition reactor driven by an external heat source are as follows:

[0019]

[0020] The optional technical solution of the present invention also includes a heat exchanger, which has a first heat exchange flow path, the first end of the first heat exchange flow path is respectively connected to the first gas outlet and the second gas outlet, and the second end of the first heat exchange flow path is connected to the synthesis gas storage tank; the second heat exchange flow path, the two ends of which are respectively connected to the outlet of the gas source and the gas supply port.

[0021] According to the technical solution, a heat exchanger is provided to exchange heat between the synthesis gas and the gas source, thereby realizing the utilization of the waste heat of the synthesis gas. At the same time, the gas source is preheated, thereby increasing the temperature of the gas source entering the gas supply port. The preheated gas source enters the biomass gasification furnace, realizing the circulation of waste heat and providing thermal energy for biomass gasification.

[0022] In the optional technical solution of the present invention, the decomposition reactor driven by an external heat source includes: a combustion furnace using fossil energy as fuel, a high-throughput solar concentrating thermal reactor, an electric heater driven by clean energy electricity, and an electric heater directly driven by thermal power.

[0023] According to the technical solution, the decomposition reactor driven by an external heat source includes but is not limited to one or more of the following: an electric heating furnace directly driven by conventional electricity, a combustion furnace based on the combustion of fossil energy, an electric heating furnace using renewable energy such as abandoned wind and abandoned solar power, a high-throughput solar concentrating heat collection reactor or a solar furnace, etc. When the decomposition reactor is combined with renewable energy, it can further reduce the pollutant emissions in the biomass gasification process and promote the low-carbon transformation of biomass gasification technology.

[0024] In an optional technical solution of the present invention, metal oxides for inhibiting sintering are added to the calcium-based thermochemical heat storage particles, and the metal elements in the metal oxides are selected from one or more of Al, Ce, Zr, Mg, Mn, and Y.

[0025] According to the technical solution, CaO / CaCO 3 It is easy to agglomerate and deactivate under high temperature conditions, and the addition of elements with high Tamman temperature can effectively inhibit sintering. Anti-sintering elements include but are not limited to one or more of the above, and technicians can select the required anti-sintering components according to actual needs.

[0026] In an optional technical solution of the present invention, catalytic elements for catalyzing biomass gasification are mixed into the calcium-based thermochemical heat storage particles, and the catalytic elements are selected from one or more of Ce, Ni, Fe, and Mn.

[0027] According to the technical solution, the reaction rate of biomass gasification can be increased by adding catalytic elements, thereby accelerating the biomass gasification process. The catalytic elements are not limited to the above types, and technicians can select the type of catalytic elements according to actual needs.

[0028] In an optional technical solution of the present invention, the gas provided by the gas source is one or more of air, pure oxygen, and water vapor, and the gas source is also used to fluidize the biomass in the biomass gasifier.

[0029] According to the technical solution, by supplementing any one or more of the above gases, the gasification of biomass can be promoted to achieve a better biomass gasification effect.

[0030] The optional technical solution of the present invention further includes a selective gas separation device connected between the synthesis gas outlet and the synthesis gas storage tank, and the selective gas separation device is used to separate the target gas from the synthesis gas.

[0031] According to the technical solution, the gases flowing out of the first gas outlet and the second gas outlet, except CH 4 , CO or H 2 In addition, it may also include carbon dioxide, so by choosing a suitable selective gas separation device (such as CO 2The carbon dioxide in the synthesis gas is removed by a PSA adsorption device to obtain a high calorific value synthesis gas. The technician can select a suitable selective gas separation device as needed to obtain one or more target gases, such as selectively separating hydrogen from the synthesis gas by a PSA pressure swing adsorption device. The type of device required for gas separation can be selected according to the existing technology and is not limited in this application.

[0032] In an optional technical solution of the present invention, the biomass gasifier includes any one of an updraft gasifier, a downdraft gasifier, a transverse suction gasifier, and a bubbling fluidized bed gasifier.

[0033] According to the technical solution, the form of the biomass gasifier can be flexibly selected.

[0034] The present invention further provides a biomass gasification method using the above-mentioned biomass gasification system, comprising the following steps:

[0035] Heat supply and decomposition step: providing heat energy required for decomposition of calcium-based thermochemical heat storage particles through an external heat source, and the calcium-based thermochemical heat storage particles receiving the heat energy provided by the external heat source and decomposing in a decomposition reactor;

[0036] The second gas-solid separation step: the second mixture obtained in the heating and decomposition steps is discharged from the second mixture outlet into the second gas-solid separator for gas-solid separation, the separated high-temperature carbon dioxide is discharged through the second gas outlet, and the separated solid decomposition product enters the biomass gasifier through the decomposition product inlet and serves as a synthetic reactant;

[0037] Gasification and synthesis steps: the biomass in the biomass gasifier receives the heat of the solid decomposition product to gasify and produce synthesis gas, and the solid decomposition product reacts with the synthesis gas to obtain a solid synthesis product;

[0038] The first gas-solid separation step: the first mixture obtained in the gasification and synthesis step is discharged from the first mixture outlet into the first gas-solid separator for gas-solid separation, the separated synthesis gas is discharged through the first gas outlet, and the separated solid synthesis product enters the decomposition reactor through the synthesis inlet and serves as a decomposition reactant;

[0039] Gas supply step: in the gasification and synthesis step, the gasification agent required for biomass gasification is provided to the biomass gasifier;

[0040] Synthesis gas storage step: collecting the gas from the first gas outlet and the second gas outlet.

[0041] The optional technical solution of the present invention further includes a heat exchange preheating step: the gas provided by the gas source exchanges heat with the gas at the first gas outlet and the second gas outlet and then enters the biomass gasifier through the gas supply port.

[0042] The present invention has at least the following advantages:

[0043] (1) Introducing an external heat source to provide heat for the biomass gasification process avoids the combustion process of biomass, reduces pollutant emissions, and improves the yield and gasification efficiency of syngas;

[0044] (2) Introducing calcium-based materials as heat transfer media and CO 2 Adsorption materials promote the generation of syngas, fully introduce the heat of external heat source into the biomass gasifier in the form of sensible heat and chemical heat, and at the same time, calcium-based materials can serve as a potential carrier of biomass catalysts to accelerate the biomass gasification process;

[0045] (3) By adding a decomposition reactor driven by an external heat source, renewable energy is coupled with the biomass gasification process, which can absorb some of the abandoned wind and electricity, achieve low-carbon and clean gas production, and improve the energy quality of biomass energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 Schematic diagram of the structure of the biomass gasification system in the first embodiment of the present invention.

[0047] Figure 2 Schematic diagram of the structure of the biomass gasification system in the second embodiment of the present invention.

[0048] Reference numerals:

[0049] 1-biomass feeding device; 2-biomass gasifier; 31-first gas-solid separator; 32-second gas-solid separator; 4-decomposition reactor driven by external heat source; 5-heat exchanger; 6-selective gas separation device; 7-synthesis gas storage tank; DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] Hereinafter, two embodiments of the present invention will be described with reference to the drawings.

[0052] Embodiment 1:

[0053] like Figure 1As shown, it is a biomass gasification system using solar energy directly as an external heat source. The biomass gasification system mainly includes: a biomass feeding device 1, a biomass gasifier 2, a first gas-solid separator 31, a second gas-solid separator 32, a decomposition reactor 4 (solar furnace or collector) using solar energy directly as an external heat source, a heat exchanger 5, a selective gas separation device 6, a synthesis gas storage tank 7 and a gas source. Among them,

[0054] The biomass feeding device 1 is composed of a biomass storage tank and a crawler conveyor, and is equipped with a control system capable of adjusting the feeding rate of the biomass.

[0055] Biomass, preheated gas (air or water vapor or pure oxygen), and solid decomposition products (high-temperature CaO) are introduced into the biomass gasifier 2. The biomass gasification process can be adjusted by adjusting the feed rate of each component.

[0056] The first gas-solid separator 31 above the biomass gasifier 2 uses centrifugal force to separate coke, calcium carbonate and other solid ash in the synthesis gas, and the solid components are introduced into the decomposition reactor 4 driven by the external heat source; the second gas-solid separator 32 above the decomposition reactor 4 driven by the external heat source uses centrifugal force to separate high-temperature CO 2 The CaO in the biomass gasifier 2 is introduced into the biomass gasifier 2; the first gas-solid separator 31 and the second gas-solid separator 32 are specifically cyclone separators.

[0057] Decomposition reactor driven by external heat source 4: heating coke and calcium carbonate to promote coke decomposition to produce CO 2 , promoting CaCO 3 Decomposes into CaO.

[0058] The heat exchanger 5 is used to recover the heat of the high-temperature synthesis gas separated by the first gas-solid separator 31 and the CO generated by the combustion of coke. 2 The heat of the biomass gasifier 2 is used to heat the gas (air, water vapor or pure oxygen) to be introduced into the biomass gasifier 2.

[0059] The selective gas separation device 6 can be used to separate CO from the synthesis gas. 2 etc. impurity gases, output CO, CH 4 , H 2 It can also separate high calorific value synthesis gas of single component.

[0060] The synthesis gas storage tank 7 is used to store the synthesis gas separated by the first gas-solid separator 31 and the second gas-solid separator 32 (it should be noted that CO 2 The components that can be attributed to synthesis gas include CO, H 2 and CH 4 It is the part of the synthesis gas with a higher calorific value).

[0061] In this embodiment, the solar furnace or collector using solar energy as an external heat source converts CaCO into 3 Decomposes into high temperature CaO and high temperature CO 2 , high temperature CO 2 After being separated in the second gas-solid separator 32 , the gas is preheated by the heat exchanger 5 to be introduced into the biomass gasifier 2 . The high-temperature CaO is separated in the second gas-solid separator 32 and introduced into the biomass gasifier 2 .

[0062] The biomass enters the biomass gasifier 2 through the biomass feeding device 1, and the biomass in the biomass gasifier 2 is fluidized by the preheated gas.

[0063] The high-temperature CaO separated by the second gas-solid separator 32 provides the heat required for biomass gasification and absorbs the CO generated during the biomass gasification process. 2 Formation of CaCO 3 Release chemical heat, CaCO in biomass gasifier 2 3 , coke, ash and other solid components and CO 2 , CH 4 , CO, H 2 The gas components are separated by the first gas-solid separator 31, and the separated solid components enter the solar furnace or collector that directly uses solar energy as an external heat source, and are decomposed under the drive of the external heat source. The separated gas components enter the heat exchanger 5 to exchange heat with the gas source, and the gas components after releasing heat then enter the selective gas separation device 6. The separated specific gas components (such as CH 4 , CO, H 2 One or more of the above) enters the synthesis gas storage tank 7.

[0064] The biomass double-bed gasification system with external heat source driven calcium circulation designed in this embodiment is centered on biomass gasification to prepare high calorific value syngas, realizing efficient utilization of biomass. The introduction of external heat source in the whole process reduces the biomass combustion process and realizes CaCO 3 / CaO recycling reduces CO 2 emissions and realizes the utilization of waste heat.

[0065] Embodiment 2:

[0066] like Figure 2 As shown, this embodiment further provides a biomass gasification system, which is different from Example 1 in that the decomposition reactor 4 is driven by external electric energy, such as an electric heater, which provides the heat energy required for the decomposition of the calcium-based thermochemical heat storage particles by heating the electric heater.

[0067] In this embodiment, the calcium-based thermochemical heat storage material is formed into particles, which can better absorb heat and move in the decomposition reactor 4, ensuring that CaCO 3 The calcium-based particles can be formed by one or more of the following methods: extrusion spheronization, rolling molding, and spray granulation.

[0068] In this embodiment, the calcium-based thermochemical heat storage particles are composite calcium-based particles doped with anti-sintering components and catalyst components. The anti-sintering component is an aluminum-containing active component such as aluminum oxide, and the catalyst component is a nickel-containing catalyst such as nickel oxide. The doped calcium-based particles have a long cycle life, a fast biomass gasification rate, can achieve rapid gasification of biomass, and have good high temperature stability and cycle characteristics. The doping method includes but is not limited to one or more of the following: solid phase doping method, sol-gel doping method, hydrothermal doping method, etc.

[0069] In some embodiments, the thermochemical heat storage material is not limited to calcium-based materials, and other thermochemical heat storage materials that can undergo synthesis and decomposition and absorb gasification products for synthesis to promote the biomass gasification process can be applicable to the present invention.

[0070] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A biomass gasification system, characterized in that: include: A biomass gasifier is used to provide a place for pyrolysis and gasification of biomass. The biomass gasifier includes biomass imports; A first mixture outlet, used to discharge a first mixture in the biomass gasifier, wherein the first mixture includes a solid synthetic material and synthetic gas generated by gasification; Import of decomposition products, and Air supply port; A decomposition reactor driven by an external heat source, the decomposition reactor is used to provide a place for decomposing calcium-based thermochemical heat storage particles and coke, and the external heat source provides the heat energy required for the decomposition of the calcium-based thermochemical heat storage particles; the decomposition reactor has a second mixture outlet and a synthetic material inlet, the second mixture outlet is used to discharge the second mixture in the decomposition reactor, the second mixture includes solid decomposition products obtained by decomposing the calcium-based thermochemical heat storage particles and high-temperature carbon dioxide; The first gas-solid separator comprises a first mixture inlet, connected to the first mixture outlet; a first gas outlet for discharging the synthesis gas; and a first solid outlet, connected to the composition inlet; the solid composition in the first mixture is separated by the first gas-solid separator and then enters the decomposition reactor through the composition inlet; the solid composition serves as a reactant for decomposition in the decomposition reactor; The second gas-solid separator comprises a second mixture inlet, connected to the second mixture outlet; a second gas outlet, for discharging the high-temperature carbon dioxide; and a second solid outlet, connected to the decomposition product inlet; the solid decomposition product in the second mixture is separated by the second gas-solid separator and then enters the biomass gasifier through the decomposition product inlet; the solid decomposition product is used to provide heat energy required for biomass gasification; the solid decomposition product reacts with the synthesis gas generated by the biomass gasification to obtain the solid synthesis gas; A gas source, used for providing a gasifying agent required for biomass gasification to the biomass gasifier, wherein the outlet of the gas source is connected to the gas supply port; A synthesis gas storage tank is connected to the first gas outlet and the second gas outlet.

2. The biomass gasification system according to claim 1, characterized in that: Also includes a heat exchanger having a first heat exchange flow path, wherein a first end of the first heat exchange flow path is connected to the first gas outlet and the second gas outlet respectively, and a second end of the first heat exchange flow path is connected to the synthesis gas storage tank; The second heat exchange flow path has two ends connected to the outlet of the gas source and the gas supply port respectively.

3. The biomass gasification system according to claim 2, characterized in that: The decomposition reactor driven by the external heat source includes: a combustion furnace using fossil energy as the external heat source, a combustion furnace using solar energy directly as the external heat source, an electric heater driven by clean energy electricity, and an electric heater directly driven by thermal power.

4. The biomass gasification system according to claim 2, characterized in that: The calcium-based thermochemical heat storage particles are doped with metal oxides for inhibiting sintering, and the metal elements in the metal oxides are selected from one or more of Al, Ce, Zr, Mg, Mn, and Y.

5. The biomass gasification system according to claim 4, characterized in that: The calcium-based thermochemical heat storage particles are doped with catalytic elements for catalyzing biomass gasification, and the catalytic elements are selected from one or more of Ce, Ni, Fe, and Mn.

6. The biomass gasification system according to claim 1, characterized in that: The gas provided by the gas source is one or more of air, pure oxygen, and water vapor. The gas source is also used to fluidize the biomass in the biomass gasifier.

7. The biomass gasification system according to claim 1, characterized in that: Also includes A selective gas separation device is connected between the synthesis gas outlet and the synthesis gas storage tank, and the selective gas separation device is used to separate impurity gases in the synthesis gas.

8. The biomass gasification system according to any one of claims 1 to 7, characterized in that: The biomass gasifier includes any one of an updraft gasifier, a downdraft gasifier, a transverse-draft gasifier, and a bubbling fluidized bed gasifier.

9. A biomass gasification method using the biomass gasification system according to any one of claims 1 to 8, characterized in that: The following steps are involved: Heat supply and decomposition step: the heat energy required for decomposition of the calcium-based thermochemical heat storage particles is provided by the external heat source, and the calcium-based thermochemical heat storage particles receive the heat energy provided by the external heat source and decompose in the decomposition reactor; A second gas-solid separation step: the second mixture obtained in the heat supply and decomposition step is discharged from the second mixture outlet into the second gas-solid separator for gas-solid separation, the separated synthesis gas is discharged through the second gas outlet, and the separated solid decomposition product enters the biomass gasifier through the decomposition product inlet and serves as a synthetic reactant; Gasification and synthesis step: the biomass in the biomass gasifier receives the heat of the solid decomposition product and is gasified to produce synthesis gas, and the solid decomposition product reacts with the synthesis gas to obtain a solid synthesis product; A first gas-solid separation step: discharging the first mixture obtained in the gasification and synthesis step from the first mixture outlet into the first gas-solid separator for gas-solid separation, wherein the separated synthesis gas is discharged through the first gas outlet, and the separated solid synthesis product enters the decomposition reactor through the synthesis inlet and serves as a decomposition reactant; Gas supply step: in the gasification and synthesis step, providing the biomass gasifier with a gasifying agent required for biomass gasification and a gas source required for synthesis of the solid decomposed product; Synthesis gas storage step: collecting the gases from the first gas outlet and the second gas outlet.

10. The biomass gasification method according to claim 9, characterized in that: Also includes Heat exchange preheating step: the gas provided by the gas source exchanges heat with the synthesis gas from the first gas outlet and the second gas outlet and then enters the biomass gasifier through the gas supply port.

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