A method for producing biomass gas

Abstract

The application discloses a biomass gas production method, and belongs to the technical field of biomass gas, to solve the problems of low processing capacity and high energy consumption of the biomass gas production system in the prior art. The method comprises the following steps: starting a preheating combustor, supplying flue gas into a carbonization furnace to preheat the carbonization furnace; supplying biomass into a carbonization auger group, and the biomass in the carbonization auger group is initially carbonized to generate initial biomass gas; the biomass gas is ignited by a gas combustor to generate flue gas, and the flue gas is supplied into a heat storage buffer tank; and the flue gas in the heat storage buffer tank is supplied into the carbonization furnace to carbonize the biomass in the carbonization auger group to generate biomass gas. The application can be used for the production of biomass gas.

Description

Technical Field

[0001] This invention belongs to the field of biomass gas technology, and particularly relates to a method for producing biomass gas. Background Technology

[0002] Against the backdrop of global energy structure adjustment and increasing environmental awareness, the research and innovation of biomass gas production technology, as a clean and renewable energy source, is of paramount importance.

[0003] Currently, the production of biomass gas mainly adopts carbonization technology, in which carbon in biomass is converted into combustible gas through reaction.

[0004] However, most existing biomass gas production uses rotary kiln structures. On the one hand, because rotary kilns rely on the rotation of the cylinder to achieve material tumbling and heat exchange, the heat transfer efficiency is low, resulting in slow heating and limited processing capacity. On the other hand, in order to maintain the reaction temperature, a large amount of external energy needs to be continuously consumed, especially when processing materials with high moisture content, the energy cost soars. Summary of the Invention

[0005] Based on the above analysis, the present invention aims to provide a biomass gas production method to solve the problems of low processing capacity and high energy consumption in existing biomass gas production systems.

[0006] The objective of this invention is mainly achieved through the following technical solutions.

[0007] This invention provides a method for producing biomass gas, comprising the following steps:

[0008] Step 1: Turn on the preheating burner to supply flue gas into the carbonization furnace and preheat the furnace.

[0009] Step 2: The biomass is fed into the carbonization auger assembly, where the biomass undergoes initial carbonization to generate initial biomass fuel gas.

[0010] Step 3: Biomass gas is ignited by a gas burner to generate flue gas, which is then fed into a heat storage buffer tank.

[0011] Step 4: The flue gas in the heat storage buffer tank is fed into the carbonization furnace to carbonize the biomass in the carbonization auger assembly, producing biomass fuel gas.

[0012] Furthermore, in step 1, the preheating temperature of the carbonization furnace is 300℃~400℃.

[0013] Furthermore, in step 4, the carbonization temperature of the biomass is 350℃~420℃.

[0014] Furthermore, in step 4, the carbonization pressure of the biomass is -20 Pa to 30 Pa.

[0015] Furthermore, step 4 also includes the following steps:

[0016] During the biomass carbonization process, thermocouples are used to collect temperature data inside the carbonization furnace in real time and transmit it to the controller;

[0017] The controller determines whether the temperature data exceeds the temperature threshold. If it does, it opens the flue gas release port on the heat storage buffer tank to reduce the high-temperature flue gas supplied to the carbonization furnace.

[0018] Furthermore, the temperature threshold is 450℃.

[0019] Furthermore, step 4 also includes the following steps:

[0020] During the biomass carbonization process, pressure sensors are used to collect pressure data inside the carbonization furnace in real time and transmit it to the controller;

[0021] The controller determines whether the pressure data exceeds the pressure threshold. If it does, it opens the flue gas release port on the heat storage buffer tank to reduce the high-temperature flue gas supplied to the carbonization furnace.

[0022] Furthermore, the pressure threshold is 0.05 MPa.

[0023] Furthermore, step 4 is followed by the following steps:

[0024] Step 5: Remove dust from the exhaust gas discharged from the carbonization furnace, and then discharge the exhaust gas through the chimney.

[0025] Furthermore, the biomass gas production method employs a biomass gas production system:

[0026] The biomass gas production system includes a carbonization furnace, a heat storage buffer tank, a gas burner, a cyclone separator, and a tail gas dust collector. The carbonization auger assembly is located in the carbonization furnace.

[0027] The gas outlet of the carbonization auger assembly is connected in sequence to the gas burner and the heat storage buffer tank, and the exhaust gas outlet of the carbonization furnace is connected in sequence to the cyclone separator and the tail gas dust collector.

[0028] Furthermore, the gas burner includes a combustible gas inlet pipe, an inner cylinder, an outer cylinder, a flue gas outlet pipe, and an igniter.

[0029] Furthermore, the combustible gas inlet pipe, inner cylinder, and flue gas outlet pipe are connected in sequence. The inner cylinder is located inside the outer cylinder and is coaxially and fixedly connected to the outer cylinder. The inner cylinder is equipped with a central diffuser cone and cyclone blades coaxially arranged with the inner cylinder. There is a gap between the outer wall of the central diffuser cone and the inner wall of the inner cylinder. The cyclone blades are sleeved on the outer wall of the central diffuser cone. The inner end of the cyclone blades is fixedly connected to the central diffuser cone, and the outer end of the cyclone blades is fixedly connected to the inner wall of the inner cylinder. The cyclone blades are located in the gap between the outer wall of the central diffuser cone and the inner wall of the inner cylinder.

[0030] Furthermore, multiple cyclone air holes are opened on the side wall of the inner cylinder, and a main air inlet is opened on the side wall of the outer cylinder. There is a gap between the inner cylinder and the outer cylinder. The main air inlet, the gap between the inner cylinder and the outer cylinder, and the cyclone air holes constitute a cyclone channel. The ignition end of the igniter extends into the inner cylinder.

[0031] Furthermore, the outer cylinder is a constant diameter cylinder structure.

[0032] Furthermore, the combustible gas inlet pipe and the flue gas outlet pipe are constant diameter pipes.

[0033] Furthermore, the inner cylinder includes an expanding section, a contracting section, and a constant diameter section connected sequentially along the direction of combustible gas flow. The central diffuser cone and cyclone blades are both located within the expanding section. The cyclone air holes are located on the side wall of the expanding section and on the side of the cyclone blades away from the combustible gas inlet pipe. The igniter is located on the side of the cyclone blades away from the combustible gas inlet pipe.

[0034] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0035] A) In the biomass gas production method provided by the present invention, the carbonization and heating of biomass in the carbonization furnace is achieved by burning the gas generated from biomass carbonization. Only a small amount of natural gas needs to be provided for combustion in the initial stage of operation to generate the initial carbonization heat required by the biomass. The subsequent operation of the device can achieve self-sufficiency in heat by using the gas generated by itself, reducing external energy consumption, lowering operating costs, and saving energy and protecting the environment.

[0036] B) In the biomass gas production method provided by the present invention, due to the setting of the expansion section and the constant diameter section of the outer cylinder, when air is supplied from the main air inlet into the gap between the inner cylinder and the outer cylinder, the cross-section of the gap gradually decreases, causing the air velocity to continuously increase, and the high-speed swirling air is supplied into the outer cylinder through the cyclone air hole.

[0037] C) In the biomass gas production method provided by the present invention, due to the setting of the central diffusion cone, the flow cross section of the combustible gas can be reduced, the flow velocity of the combustible gas can be increased, the flow resistance caused by the setting of the cyclone blades can be reduced, and the combustible gas can flow smoothly through the cyclone blades.

[0038] D) In ​​the biomass gas production method provided by the present invention, the use of a specific structure for the outer and inner cylinders and the specific positions of each component can increase the air flow rate and the combustible gas flow rate on the basis of realizing the nested structure of the outer and inner cylinders, thereby forming two high-speed swirling flows and achieving full mixing of air and combustible gas.

[0039] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained through the embodiments described and the accompanying drawings, which are particularly pointed out. Attached Figure Description

[0040] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0041] Figure 1 This is a flowchart of a biomass gas production method provided in Embodiment 1 of the present invention;

[0042] Figure 2 This is a schematic diagram of the biomass gas production system in the biomass gas production method provided in Embodiment 1 of the present invention;

[0043] Figure 3 This is a schematic diagram of the biomass gas production system in the biomass gas production method provided in Embodiment 1 of the present invention from another perspective.

[0044] Figure 4 This is a schematic diagram of the carbonization screw conveyor assembly in the biomass gas production method provided in Embodiment 1 of the present invention;

[0045] Figure 5 This is a schematic diagram of the gas burner in the biomass gas production method provided in Embodiment 1 of the present invention.

[0046] Figure label:

[0047] 1-Carbonization tube body; 2-Carbonization auger blades; 3-Carbonization shaft; 4-Cyclone separator; 5-Exhaust gas dust collector; 6-Pressure sensor; 7-Thermocouple; 8-Cooling tube body; 9-Cooling auger blades; 10-Cooling shaft; 11-Drive motor; 12-Reducer; 13-Carbonization furnace; 14-Heat storage buffer tank; 15-Gas burner; 151-Combustible gas inlet pipe; 152-Inner cylinder; 153-Outer cylinder; 154-Flue gas outlet pipe; 155-Igniter; 156-Central diffuser cone; 157-Cyclone blades; 158-Main air outlet; 159-Cyclone air hole. Detailed Implementation

[0048] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0049] This invention provides a method for producing biomass gas, see [link to relevant documentation]. Figure 1 It includes the following steps:

[0050] Step 1: Turn on the preheating burner to supply high-temperature flue gas into the carbonization furnace 13 to preheat the carbonization furnace 13;

[0051] Step 2: The biomass is fed into the carbonization auger assembly, where the biomass undergoes initial carbonization to generate initial biomass fuel gas (e.g., carbon monoxide and / or hydrogen).

[0052] Step 3: After the biomass gas is ignited by the gas burner 15, it generates high-temperature flue gas, which is then fed into the heat storage buffer tank 14.

[0053] Step 4: The high-temperature flue gas in the heat storage buffer tank 14 is fed into the carbonization furnace 13 to carbonize the biomass in the carbonization screw conveyor group and continuously generate biomass fuel gas.

[0054] Compared with the prior art, the biomass gas production method provided by the present invention utilizes the combustion of gas generated during biomass carbonization to achieve carbonization heating of biomass in carbonization furnace 13. Only a small amount of natural gas needs to be provided for combustion in the initial stage of operation to generate the initial carbonization heat required by the biomass. The subsequent operation of the device can achieve self-sufficiency in heat by utilizing the gas generated by itself, reducing external energy consumption, lowering operating costs, and saving energy and protecting the environment.

[0055] For example, in order to enable sufficient initial carbonization of biomass, the preheating temperature of the carbonization furnace 13 in step 1 above is 300°C to 400°C.

[0056] Accordingly, in order to achieve continuous and complete carbonization of biomass, for example, in step 4 above, the carbonization temperature of biomass is 350℃~420℃ and the carbonization pressure of biomass is -20Pa~30Pa.

[0057] In order to ensure the accuracy of carbonization parameter control within the carbonization furnace 13, step 4 above also includes the following steps:

[0058] During the biomass carbonization process, thermocouple 7 is used to collect temperature data inside the carbonization furnace 13 in real time and transmit it to the controller;

[0059] The controller determines whether the temperature data exceeds the temperature threshold;

[0060] If the temperature exceeds the limit, the flue gas release port on the heat storage buffer tank 14 will be opened to reduce the high-temperature flue gas supplied to the carbonization furnace 13.

[0061] It should be noted that the above temperature threshold is 450℃.

[0062] Accordingly, in order to ensure the safety of biomass carbonization in carbonization furnace 13, step 4 above also includes the following steps:

[0063] During the biomass carbonization process, pressure sensor 6 is used to collect pressure data in the carbonization furnace 13 in real time and transmit it to the controller;

[0064] The controller determines whether the pressure data exceeds the pressure threshold;

[0065] If the temperature exceeds the limit, the flue gas release port on the heat storage buffer tank 14 will be opened to reduce the high-temperature flue gas supplied to the carbonization furnace 13.

[0066] It should be noted that the pressure threshold mentioned above is 0.05 MPa.

[0067] In this way, by adopting the above method, the temperature and pressure inside the carbonization furnace 13 can be monitored in real time, ensuring the stable operation of biomass carbonization, avoiding the dangers of over-temperature and over-pressure, and improving the overall safety of the method.

[0068] In order to treat the exhaust gas discharged from the carbonization furnace 13, the following steps are included after step 4 above:

[0069] Step 5: Remove dust from the exhaust gas discharged from the carbonization furnace 13, and then discharge the exhaust gas through the chimney.

[0070] For example, the above-mentioned biomass gas production method adopts a biomass gas production system with the following structure:

[0071] See Figures 2 to 3 It includes a carbonization furnace 13, a heat storage buffer tank 14, a gas burner 15, a cyclone separator 4, and a tail gas dust collector 5, with the carbonization auger assembly located in the carbonization furnace 13.

[0072] The gas outlet of the carbonization auger assembly is connected in sequence to the gas burner 15 and the heat storage buffer tank 14, and the exhaust gas outlet of the carbonization furnace 13 is connected in sequence to the cyclone separator 4 and the tail gas dust collector 5.

[0073] For the structure of the carbonized auger assembly, see [link / reference]. Figure 4 It includes multiple parallel carbonized auger pipes, each carbonized auger pipe comprising a carbonized pipe body 1, carbonized auger blades 2 and a carbonized rotating shaft 3 disposed within the carbonized pipe body 1, the carbonized auger blades 2 being sleeved on the outer wall of the carbonized rotating shaft 3, and the multiple carbonized pipe bodies 1 connected end to end forming a zigzag biomass conveying pipeline.

[0074] The spiral directions of two adjacent carbonized auger blades 2 are opposite. The carbonized auger blades 2 are driven to rotate by the carbonized rotating shaft 3 to realize the transportation of biomass.

[0075] In order to cool down the carbonized biomass, the carbonization auger assembly also includes a cooling auger pipe, which is arranged in parallel with the carbonization auger pipe.

[0076] The cooling auger tube includes a cooling tube body 8, cooling auger blades 9 and a cooling shaft 10 disposed inside the cooling tube body 8. The cooling auger blades 9 are sleeved on the outer wall of the cooling shaft 10. The feed end of the cooling tube body 8 is connected to the discharge end of the last carbonized tube body 1. The spiral direction of the cooling auger blades 9 is opposite to the spiral direction of the last carbonized auger blades 2. The carbonized biomass is cooled through the cooling auger tube.

[0077] To simplify the structure of the carbonization auger assembly and simultaneously enable the rotation of multiple carbonization shafts 3 and cooling shafts 10, the aforementioned carbonization auger assembly also includes a drive motor 11, a reducer 12, and a synchronous pulley. The output shaft of the drive motor 11 is connected to the input end of the synchronous pulley via the reducer 12, and the output end of the synchronous pulley is connected to multiple carbonization shafts 3 and cooling shafts 10 respectively. In this way, the drive motor 11 sequentially drives multiple carbonization shafts 3 and cooling shafts 10 to rotate synchronously via the reducer 12 and the synchronous pulley, thereby achieving the conveying of biomass within the carbonization auger assembly.

[0078] For the structure of the gas burner 15, see [link / reference]. Figure 5 It includes a combustible gas inlet pipe 151, an inner cylinder 152, an outer cylinder 153, a flue gas outlet pipe 154, and an igniter 155.

[0079] The combustible gas inlet pipe 151, inner cylinder 152 and flue gas outlet pipe 154 are connected in sequence. The inner cylinder 152 is located inside the outer cylinder 153 and is coaxially fixedly connected to the outer cylinder 153. The inner cylinder 152 is provided with a central diffuser cone 156 and a cyclone blade 157 coaxially arranged with the inner cylinder 152. There is a gap between the outer wall of the central diffuser cone 156 and the inner wall of the inner cylinder 152. The cyclone blade 157 is sleeved on the outer wall of the central diffuser cone 156. The inner end of the cyclone blade 157 is fixedly connected to the central diffuser cone 156 and the outer end of the cyclone blade 157 is fixedly connected to the inner wall of the inner cylinder 152. The cyclone blade 157 is located in the gap between the outer wall of the central diffuser cone 156 and the inner wall of the inner cylinder 152.

[0080] Multiple cyclone air holes 159 are opened on the side wall of the inner cylinder 152, and a main air inlet 158 ​​is opened on the side wall of the outer cylinder 153. There is a gap between the inner cylinder 152 and the outer cylinder 153. The main air inlet 158, the gap between the inner cylinder 152 and the outer cylinder 153 and the cyclone air holes 159 form a cyclone channel. The ignition end of the igniter 155 extends into the inner cylinder 152.

[0081] It should be noted that the central diffuser cone 156 is positioned so that its larger end faces the flame direction, which can also block the flame and prevent it from flowing back to the other layer of the central diffuser cone 156, thus ensuring the combustion safety of the preheating burner and the gas burner 15.

[0082] For example, the outer cylinder 153 is a constant diameter cylinder structure.

[0083] The combustible gas inlet pipe 151 and the flue gas outlet pipe 154 are constant diameter pipes.

[0084] The inner cylinder 152 includes an expanding section, a narrowing section and a constant diameter section connected in sequence along the direction of combustible gas flow. The central diffuser cone 156 and the cyclone blade 157 are both located in the expanding section. The cyclone air hole 159 is located on the side wall of the expanding section and is located on the side of the cyclone blade 157 away from the combustible gas inlet pipe 151. The igniter 155 is located on the side of the cyclone blade 157 away from the combustible gas inlet pipe 151.

[0085] Thus, on the one hand, due to the setting of the expansion section and the constant diameter section of the outer cylinder 153, when air is supplied from the main air outlet 158 ​​into the gap between the inner cylinder 152 and the outer cylinder 153, the cross-section of the gap gradually decreases, causing the air velocity to continuously increase, and the air flows through the cyclone air hole 159 to form a high-speed swirling flow of air which is supplied into the outer cylinder 153.

[0086] On the other hand, due to the setting of the central diffuser cone 156, the flow cross section of the combustible gas can be reduced, the flow velocity of the combustible gas can be increased, the flow resistance caused by the setting of the cyclone blades 157 can be reduced, and the combustible gas can flow smoothly through the cyclone blades 157.

[0087] In summary, by adopting a specific structure for the outer cylinder 153 and the inner cylinder 152, as well as the specific positions of each component, it is possible to increase the air velocity and the combustible gas velocity while realizing the nested structure of the outer cylinder 153 and the inner cylinder 152, thereby forming two high-speed swirling streams and achieving full mixing of air and combustible gas.

[0088] It is worth noting that the generation of two high-speed swirling streams may cause a decrease in air pressure near the axis of the inner cylinder 152, resulting in a lower concentration of combustible gas and air at this location, which may affect the uniformity of combustion within the inner cylinder 152.

[0089] Therefore, the gas burner 15 also includes a double-helix central gas supply pipe assembly.

[0090] Specifically, the central gas supply pipe assembly is located inside the inner cylinder 152 and is coaxially arranged with the inner cylinder 152. The central gas supply pipe assembly includes a spiral combustible gas supply pipe and a spiral air supply pipe, which are intertwined to form a double spiral structure. Multiple combustible gas nozzles are opened on the combustible gas supply pipe, and the gas outlet direction of the combustible gas nozzles is perpendicular to the side wall of the combustible gas supply pipe. Multiple air nozzles are opened on the air supply pipe, and the gas outlet direction of the air nozzles is perpendicular to the side wall of the air supply pipe. The combustible gas ejected from the combustible gas nozzles has the same swirling direction as the combustible gas flowing out of the cyclone blades 157. The air ejected from the air nozzles has the same swirling direction as the air supplied from the cyclone air holes 159.

[0091] In this way, the double-helix central gas supply pipe assembly can effectively compensate for the low concentration of combustible gas and air in the central area, and improve combustion uniformity.

[0092] In addition, the combustible gas ejected from the combustible gas nozzle and the air ejected from the air nozzle are still two swirling streams, further enhancing the overall swirling flow of the airflow inside the inner cylinder 152.

[0093] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for producing a biomass gas, characterized by, The method comprises the following steps: step 1, starting a preheating burner to supply flue gas into a carbonization furnace to preheat the carbonization furnace; step 2, supplying biomass into a carbonization auger group, the biomass in the carbonization auger group is initially carbonized to generate initial biomass gas; step 3, the biomass gas is ignited by a gas burner to generate flue gas, which is supplied into a heat storage buffer tank; and step 4, the flue gas in the heat storage buffer tank is supplied into the carbonization furnace to carbonize the biomass in the carbonization auger group to generate biomass gas. The biomass gas production method adopts a biomass gas production system, which comprises a carbonization furnace and a gas burner, the carbonization auger group is arranged in the carbonization furnace, and the gas burner comprises a combustible gas inlet pipe, an inner cylinder, an outer cylinder, a flue gas outlet pipe and an igniter; the combustible gas inlet pipe, the inner cylinder and the flue gas outlet pipe are sequentially connected, the inner cylinder is arranged in the outer cylinder and is fixedly connected with the outer cylinder in a coaxial manner, the inner cylinder is provided with a central diffusion cone and a cyclone blade which are arranged in a coaxial manner in the inner cylinder, the central diffusion cone has a gap between an outer wall thereof and an inner wall of the inner cylinder, the cyclone blade is sleeved on the outer wall of the central diffusion cone, an inner end of the cyclone blade is fixedly connected with the central diffusion cone, an outer end of the cyclone blade is fixedly connected with the inner wall of the inner cylinder, and the cyclone blade is located in the gap between the outer wall of the central diffusion cone and the inner wall of the inner cylinder; a plurality of cyclone air holes are formed in the side wall of the inner cylinder, a main air inlet is formed in the side wall of the outer cylinder, the inner cylinder and the outer cylinder have a gap therebetween, the ignition end of the igniter extends into the inner cylinder, and the large end of the central diffusion cone faces the flame direction. The outer cylinder has a constant-diameter cylinder structure; the inner cylinder comprises a diameter-expanding section, a diameter-reducing section and a constant-diameter section which are sequentially connected in the flow direction of the combustible gas, the central diffusion cone and the cyclone blade are arranged in the diameter-expanding section, the cyclone air holes are arranged in the side wall of the diameter-expanding section and are located on the side of the cyclone blade away from the combustible gas inlet pipe, and the igniter is located on the side of the cyclone blade away from the combustible gas inlet pipe. The gas burner further comprises a double-helical central gas supply pipe group, which is located in the inner cylinder; the central gas supply pipe group comprises a helical combustible gas supply pipe and a helical air supply pipe; a plurality of combustible gas injection holes are formed in the combustible gas supply pipe; a plurality of air injection holes are formed in the air supply pipe; the combustible gas injected from the combustible gas injection holes has the same swirling direction as the combustible gas flowing out of the cyclone blade; and the air injected from the air injection holes has the same swirling direction as the gas flowing out of the cyclone air holes.

2. The method of claim 1, wherein the biomass gas production method is characterized by, In step 1, the preheating temperature of the carbonization furnace is 300-400℃.

3. The method of claim 1, wherein the biomass gas production method is characterized by, In step 4, the carbonization temperature of the biomass is 350-420℃.

4. The method of claim 1, wherein the biomass gas production method is characterized by, In step 4, the carbonization pressure of the biomass is -20-30 Pa.

5. The method of claim 1, wherein the biomass gas production method is characterized by, In step 4, the following steps are further included: In the biomass carbonization process, a thermocouple is used to collect temperature data in the carbonization furnace in real time and transmit the temperature data to a controller; The controller judges whether the temperature data exceeds a temperature threshold value, if yes, opens a flue gas release opening formed in the heat storage buffer tank to reduce the high-temperature flue gas supplied into the carbonization furnace.

6. The method of claim 5, wherein the biomass gas production method is characterized by, The temperature threshold value is 450℃.

7. The method of claim 1, wherein the biomass gas production method is characterized by, In step 4, the following steps are further included: In the biomass carbonization process, a pressure sensor is used to collect the pressure data in the carbonization furnace in real time and transmit them to the controller; The controller determines whether the pressure data exceeds the pressure threshold value. If it does, the flue gas release opening on the heat storage buffer tank is opened, reducing the high-temperature flue gas supplied into the carbonization furnace.

8. The method of claim 7, wherein the biomass gas production method is characterized by, The pressure threshold value is 0.05 MPa.

9. The method of claim 1, wherein the biomass gas production method is characterized by, The step 4 is followed by the following steps: Step 5: Dust removal is performed on the exhaust gas discharged from the carbonization furnace, and the dust-removed exhaust gas is discharged through a chimney.

10. The method of claim 1 to 9, wherein The biomass gas production system further comprises a heat storage buffer tank, a cyclone separator, and a tail gas dust removal tank. The gas outlet of the carbonization auger group is connected with a gas burner and a heat storage buffer tank in sequence, and the exhaust gas outlet of the carbonization furnace is connected with a cyclone separator and a tail gas dust removal tank in sequence.

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