Normal-pressure fixed bed biomass gasifier

Abstract

The invention discloses a normal pressure fixed bed biomass gasification furnace, and relates to the technical field of gasification furnaces, the normal pressure fixed bed biomass gasification furnace comprises a gasification furnace body, the gasification furnace body is provided with a first auxiliary mechanism and a second auxiliary mechanism, the first auxiliary mechanism comprises a lantern ring, the outer wall of the lantern ring is fixedly provided with two symmetrical connecting blocks, and the connecting blocks are connected with the lantern ring. And a shell is fixed in the lantern ring. By arranging the first auxiliary mechanism and the second auxiliary mechanism, temperature detection and heating can be conducted on the crude fuel gas output end of the normal-pressure fixed bed biomass gasifier, and the situation that due to the fact that heavy tar is condensed into sticky liquid to be attached to the inner wall of an outlet pipeline, fuel gas circulation resistance in the pipeline is increased, pressure is increased, and the fuel gas is heated is avoided. Meanwhile, the temperature in the normal-pressure fixed bed biomass gasification furnace can be detected, and the situation that the conversion rate of raw materials is reduced due to excessive reaction of part of bed layers and insufficient gasification agents of part of bed layers caused by the phenomenon that the gasification agents form bias flow in the furnace is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gasification furnaces, in particular to a normal pressure fixed bed biomass gasification furnace. BACKGROUND

[0002] Under the background of global energy transformation, the limitations of traditional fossil energy are increasingly prominent, such as limited reserves, environmental pollution and other problems, which has prompted people to accelerate the development and utilization of new energy. Biomass gasification technology, as an important direction in the field of renewable energy, is gradually emerging. At the same time, the normal pressure fixed bed biomass gasification furnace, with its unique advantages, has become one of the key equipment for efficient utilization of biomass energy. Its operation in a positive pressure environment not only affects the progress of the gasification reaction, but also plays a crucial role in gasification efficiency and gas quality, opening up a new way for the widespread application of biomass energy.

[0003] When the existing normal pressure fixed bed biomass gasification furnace is used, the gasification agent flows to the opposite side or the lower part of the furnace body after being introduced from one side of the furnace body, which is affected by the superposition of gravity and airflow inertia, forming a "partial flow" phenomenon, which leads to excessive reaction in some bed layers and insufficient gasification agent in some bed layers, thereby reducing the conversion rate of raw materials. At the same time, a small amount of heavy tar will inevitably be carried in the process of discharging the crude fuel gas. When "channeling" or local coking occurs in the bed layer of the furnace, the crude fuel gas quickly escapes outside the furnace without fully absorbing the reaction heat, and the outlet temperature will be lower than that under normal working conditions. The sudden drop in temperature causes the heavy tar, which was originally in a gaseous state, to rapidly condense into a viscous liquid and adhere to the inner wall of the outlet pipe, gradually accumulating and increasing the resistance to gas flow in the pipe, thereby causing the positive pressure in the furnace to lose control.

[0004] Therefore, we propose a normal pressure fixed bed biomass gasification furnace to solve the problems raised in the background technology. SUMMARY

[0005] The present application aims to provide a normal pressure fixed bed biomass gasification furnace, which can detect and heat the crude fuel gas output end of the normal pressure fixed bed biomass gasification furnace by setting the first auxiliary mechanism and the second auxiliary mechanism, avoiding the situation where heavy tar condenses into a viscous liquid and adheres to the inner wall of the outlet pipe, thereby increasing the resistance to gas flow in the pipe and causing the positive pressure in the furnace to lose control. At the same time, the temperature in the normal pressure fixed bed biomass gasification furnace can be detected, avoiding the situation where the gasification agent forms a "partial flow" phenomenon in the furnace, leading to excessive reaction in some bed layers and insufficient gasification agent in some bed layers, thereby reducing the conversion rate of raw materials, in order to solve the problems raised in the background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an atmospheric pressure fixed bed biomass gasifier, comprising a gasifier body, wherein a first auxiliary mechanism and a second auxiliary mechanism are provided on the gasifier body; The first auxiliary mechanism includes a collar, with two symmetrical connecting blocks fixed to the outer wall of the collar. A housing is fixed inside the collar, with a first temperature sensor installed at the input end mounting hole of the housing and a second temperature sensor installed at the output end mounting hole of the housing. A flow control valve is provided below the collar, with vent pipes installed at both the input and output ends of the flow control valve, and a main electric valve installed at the input end of one of the vent pipes. The second auxiliary mechanism includes a first thermocouple and an auxiliary electric valve. A second thermocouple is arranged opposite the first thermocouple. An auxiliary check valve is arranged near the auxiliary electric valve. An auxiliary pressure regulating valve and an auxiliary flow regulating valve are arranged above the auxiliary check valve. Conduits are installed between the auxiliary electric valve and the auxiliary check valve, between the auxiliary check valve and the auxiliary pressure regulating valve, between the auxiliary pressure regulating valve and the auxiliary flow regulating valve, and at the output end of the auxiliary flow regulating valve. The outer wall of the conduit installed at the output end of the auxiliary flow regulating valve is provided with a perforated seat.

[0007] Preferably, the gasifier body includes a furnace shell, a furnace cover is installed on the top of the furnace shell, an insulation layer is provided on the inner wall of the furnace shell, an insulation cover is provided on the inner wall of the furnace cover, and a grate is installed inside the insulation layer.

[0008] Preferably, a pressure sensor is installed on the outer wall of the furnace shell, and the detection end of the pressure sensor moves through the outer wall of the furnace shell and the outer wall of the insulation layer in sequence. An ash chamber is fixed at the lower end of the furnace shell.

[0009] Preferably, a sealed ash discharge valve is installed at the output end of the ash chamber, a controller is installed on the outer wall of the furnace shell, an auxiliary frame is fixed on the outer wall of the furnace shell, and an air filter is installed at the bottom of the inner wall of the auxiliary frame.

[0010] Preferably, a centrifugal fan is installed on the top of the inner wall of the auxiliary frame, a first connecting pipe is installed at the input end of the centrifugal fan, a multi-port pipe is installed at the output end of the centrifugal fan, and a main check valve is installed at one of the output ends of the multi-port pipe.

[0011] Preferably, a main pressure regulating valve and a main flow regulating valve are provided above the main check valve, and a second connecting pipe is installed between the main check valve and the main pressure regulating valve, between the main pressure regulating valve and the main flow regulating valve, and at the output end of the main flow regulating valve.

[0012] Preferably, the input end of the first connecting pipe is mounted with the output end of the air filter, and the output end of the second connecting pipe mounted with the main flow regulating valve is mounted with the gasification agent input end of the furnace shell.

[0013] Preferably, the centrifugal fan is used for pressurizing the filtered air and delivering the pressurized air to the inside of the furnace shell, each of the connecting blocks is fixed with the outer wall of the furnace shell, and the input end of the shell is mounted with the crude gas output end of the furnace shell.

[0014] Preferably, the input end of the main electric valve is mounted with the middle output end of the multi-way pipe, and the first and second thermocouples are mounted on the outer wall mounting points of the furnace shell.

[0015] Preferably, the input end of the auxiliary electric valve is mounted with the other output end of the multi-way pipe, the hole seat is mounted on the outer wall of the furnace shell, the main and auxiliary pressure stabilizing valves are used for stabilizing the positive pressure in the furnace shell, and the output end of the other air pipe is mounted with the input end of the sleeve ring.

[0016] Compared with the prior art, the present application has the following beneficial effects: 1. The first auxiliary mechanism is arranged to detect and heat the crude gas output end of the atmospheric fixed-bed biomass gasification furnace, so as to avoid the situation that the heavy tar condenses into viscous liquid and adheres to the inner wall of the outlet pipeline, thereby increasing the flow resistance of the gas in the pipeline and increasing the pressure, and further causing the positive pressure in the furnace to be out of control. The hot air in the multi-way pipe can be delivered to the sleeve ring and the shell through the cooperation of the started main electric valve, the started flow control valve and the air pipe, so as to heat the inside of the shell. The first temperature sensor is started to detect the temperature of the crude gas entering the inside of the shell.

[0017] 2. The second auxiliary mechanism is arranged to detect the temperature in the atmospheric fixed-bed biomass gasification furnace, so as to avoid the situation that the gasification agent forms a "partial flow" phenomenon in the furnace, thereby causing some bed layers to be excessively reacted and some bed layers to be insufficiently reacted, and reducing the conversion rate of raw materials. The hot air in the multi-way pipe can be delivered to the other side of the furnace shell through the cooperation of the started auxiliary electric valve, the auxiliary check valve, the started auxiliary pressure stabilizing valve, the started auxiliary flow regulating valve and the conduit. The first and second thermocouples are started to detect the temperatures of the two sides of the inside of the furnace shell.

[0018] 3、The biomass gasification furnace of the present application can convert biomass resources such as agricultural and forestry waste into combustible gas, and the hot air inside the hot air delivery device can be extracted and filtered, and the filtered hot air can be delivered to the inside of the multi-way pipe through the cooperation of the controller, auxiliary frame, centrifugal fan, first connecting pipe and air filter. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a perspective view of the atmospheric fixed-bed biomass gasification furnace of the present application; Figure 2 It is another angle perspective view of the atmospheric fixed-bed biomass gasification furnace of the present application; Figure 3 It is a structural schematic view of the atmospheric fixed-bed biomass gasification furnace of the present application; Figure 4 It is a partial cross-sectional perspective view of the atmospheric fixed-bed biomass gasification furnace of the present application; Figure 5 It is another angle partial cross-sectional perspective view of the atmospheric fixed-bed biomass gasification furnace of the present application; Figure 6 It is a partial cross-sectional perspective view of the heating mechanism of the atmospheric fixed-bed biomass gasification furnace of the present application; Figure 7 It is another angle structural schematic view of the atmospheric fixed-bed biomass gasification furnace of the present application; Figure 8 It is a partial perspective view of the gasification furnace body of the atmospheric fixed-bed biomass gasification furnace of the present application.

[0020] In the figure: 1, gasification furnace body; 101, furnace shell; 102, furnace cover; 103, heat preservation layer; 104, heat preservation cover; 105, grate; 106, pressure sensor; 107, ash chamber; 108, sealing ash valve; 109, controller; 110, auxiliary frame; 111, air filter; 112, centrifugal fan; 113, first connecting pipe; 114, multi-way pipe; 115, main check valve; 116, main pressure stabilizing valve; 117, main flow regulating valve; 118, second connecting pipe; 2, first auxiliary mechanism; 201, collar; 202, connecting block; 203, shell; 204, first temperature sensor; 205, second temperature sensor; 206, main electric valve; 207, air pipe; 208, flow control valve; 3, second auxiliary mechanism; 301, first thermocouple; 302, second thermocouple; 303, auxiliary electric valve; 304, auxiliary check valve; 305, auxiliary pressure stabilizing valve; 306, auxiliary flow regulating valve; 307, guide pipe; 308, hole seat. DETAILED DESCRIPTION

[0021] Clearly, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts are within the scope of the present application.

[0022] Embodiment one: please refer to Figures 1-5 , Figure 7 and Figure 8 , the present application provides a technical solution: a kind of atmospheric fixed bed biomass gasification furnace, including gasification furnace body 1, gasification furnace body 1 includes furnace shell 101, the top of furnace shell 101 is equipped with furnace cover 102, the inner wall of furnace shell 101 is provided with heat preservation layer 103, the inner wall of furnace cover 102 is provided with heat preservation cover 104, the inside of heat preservation layer 103 is equipped with grate 105, the outer wall of furnace shell 101 is equipped with pressure sensor 106, and the detection end of pressure sensor 106 is sequentially movable and penetrates the outer wall of furnace shell 101 and the outer wall of heat preservation layer 103, the lower end of furnace shell 101 is fixed with ash chamber 107, the output end of ash chamber 107 is equipped with sealed ash valve 108, the outer wall of furnace shell 101 is equipped with controller 109, the outer wall of furnace shell 101 is fixed with auxiliary frame 110, the inner wall bottom of auxiliary frame 110 is equipped with air filter 111, the inner wall top of auxiliary frame 110 is equipped with centrifugal fan 112, the input end of centrifugal fan 112 is equipped with first connecting pipe 113, the output end of centrifugal fan 112 is equipped with multi-way pipe 114, one of the output ends of multi-way pipe 114 is equipped with main check valve 115, main pressure stabilizing valve 116 and main flow regulating valve 117 are arranged above main check valve 115, second connecting pipe 118 is installed between main check valve 115 and main pressure stabilizing valve 116, between main pressure stabilizing valve 116 and main flow regulating valve 117 and the output end of main flow regulating valve 117, the input end of first connecting pipe 113 is installed with the output end of air filter 111, the second connecting pipe 118 installed at the output end of main flow regulating valve 117 is installed with the gasification agent inlet end of furnace shell 101, centrifugal fan 112 is used to pressurize filtered air, and pressurized air is delivered to the inside of furnace shell 101.

[0023] In this embodiment, in use, first, the raw material bin is connected to the input end of the furnace cover 102, then the ash shell is connected to the sealed ash valve 108, then the hot air conveying device is connected to the input end of the air filter 111, then the controller 109 is connected to the external power supply, when everything is ready, at this time, first, through the raw material bin, the furnace cover 102 and the heat preservation cover 104, the appropriate amount of pretreated raw material is released to the upper part of the grate 105, then the biomass on the grate 105 is ignited, after the stable flame appears on the biomass on the grate 105, the centrifugal fan 112, the main pressure stabilizing valve 116, the main flow regulating valve 117 and the pressure sensor 106 are started through the controller 109, at this time, the started centrifugal fan 112 will extract the hot air in the hot air conveying device through the auxiliary frame 110, the first connecting pipe 113 and the air filter 111, filter and pressurize the hot air to the inside of the multi-way pipe 114, then through the main check valve 115, the main pressure stabilizing valve 116, the main flow regulating valve 117 and the second connecting pipe 118, the filtered hot air is conveyed to the inside of the heat preservation layer 103, at this time, the gasifier body 1 can carry out the biomass gasification operation, at the same time, the started pressure sensor 106 will continuously detect the pressure between the furnace body shell 101 and the furnace cover 102, and transmit the detected pressure data to the controller 109, and the controller 109 will set the pressure threshold value and the received pressure data, and stabilize the pressure in the furnace body shell 101 through the main pressure stabilizing valve 116 and the main flow regulating valve 117, at the same time, the ash in the furnace body shell 101 which completes the gasification operation will fall into the ash chamber 107 through the through hole on the grate 105, then through the controller 109 and the sealed ash valve 108, the ash in the ash chamber 107 can be sealed and discharged under the premise of ensuring the sealing effect of the furnace body shell 101.

[0024] Embodiment two: according to Figures 1-8As shown, the gasifier body 1 is provided with a first auxiliary mechanism 2 and a second auxiliary mechanism 3, the first auxiliary mechanism 2 includes a collar 201, the outer wall of the collar 201 is fixed with two symmetrical connecting blocks 202, the inside of the collar 201 is fixed with a shell 203, the input end mounting hole of the shell 203 is installed with a first temperature sensor 204, the output end mounting hole of the shell 203 is installed with a second temperature sensor 205, the lower part of the collar 201 is provided with a flow control valve 208, the input end and the output end of the flow control valve 208 are both installed with an air pipe 207, the input end of one of the air pipes 207 is installed with a main electric valve 206, the second auxiliary mechanism 3 includes a first thermocouple 301 and an auxiliary electric valve 303, the opposite side of the first thermocouple 301 is provided with a second thermocouple 302, the vicinity of the auxiliary electric valve 303 is provided with an auxiliary check valve 304, the upper part of the auxiliary check valve 304 is provided with an auxiliary pressure stabilizing valve 305 and an auxiliary flow regulating valve 306, and the output end of the auxiliary flow regulating valve 306 is installed with a conduit 307 between the auxiliary electric valve 303 and the auxiliary check valve 304, between the auxiliary check valve 304 and the auxiliary pressure stabilizing valve 305, between the auxiliary pressure stabilizing valve 305 and the auxiliary flow regulating valve 306, and the output end of the auxiliary flow regulating valve 306, the outer wall of the conduit 307 installed at the output end of the auxiliary flow regulating valve 306 is provided with a hole seat 308, each connecting block 202 is fixed with the outer wall of the furnace body shell 101, the input end of the shell 203 is installed with the coarse gas output end on the furnace body shell 101, the input end of the main electric valve 206 is installed with the middle output end of the multi-way pipe 114, the first thermocouple 301 and the second thermocouple 302 are both installed on the outer wall mounting point of the furnace body shell 101, the input end of the auxiliary electric valve 303 is installed with the other output end of the multi-way pipe 114, the hole seat 308 is installed on the outer wall of the furnace body shell 101, the main pressure stabilizing valve 116 and the auxiliary pressure stabilizing valve 305 are used to stabilize the positive pressure in the furnace body shell 101, and the output end of the other air pipe 207 is installed with the input end of the collar 201.

[0025] In use, the crude gas treatment device is first connected to the output end of the shell 203, then the delivery pipe is connected to the output end of the sleeve 201, and then the controller 109 simultaneously starts the first thermocouple 301 and the second thermocouple 302. At this time, the started first thermocouple 301 and the started second thermocouple 302 both continuously detect the temperatures on both sides of the heat preservation layer 103 inside, and transmit the detected temperature data to the controller 109. The controller 109 calculates the two received temperature data, compares the calculated temperature difference with the first temperature threshold set in advance, and does not start the auxiliary electric valve 303 when the temperature difference is within the range of the first temperature threshold. When the temperature difference is greater than the range of the first temperature threshold, the controller 109 starts the auxiliary electric valve 303, the auxiliary pressure stabilizing valve 305, and the auxiliary flow regulating valve 306. At this time, the started auxiliary electric valve 303 sends the hot air inside the multi-way pipe 114 to the other side of the furnace body shell 101 through the auxiliary pressure stabilizing valve 305, the auxiliary flow regulating valve 306, the auxiliary check valve 304, and the conduit 307, so as to uniformly distribute the gasification agent inside the furnace body shell 101 and avoid reaction imbalance. At the same time, the controller 109 simultaneously starts the first temperature sensor 204 and the second temperature sensor 205. At this time, the started first temperature sensor 204 continuously detects the temperature inside the input end of the shell 203 and transmits the detected temperature data to the controller 109. The controller 109 compares the received temperature data with the second temperature threshold set in advance. When the temperature data received by the controller 109 is within the range of the second temperature threshold set in advance, the controller 109 does not start the main electric valve 206. When the temperature data received by the controller 109 is lower than the range of the second temperature threshold set in advance, the controller 109 starts the main electric valve 206 and the flow control valve 208. At this time, the started main electric valve 206 sends the hot air inside the multi-way pipe 114 to the space between the sleeve 201 and the shell 203 through the air pipe 207 and the flow control valve 208, so as to heat the inside of the shell 203. The started second temperature sensor 205 continuously detects the temperature inside the input end of the shell 203 and transmits the detected temperature data to the controller 109. The controller 109 compares the received temperature data with the second temperature threshold set in advance. When the temperature data is lower than the range of the second temperature threshold set in advance, the controller 109 adjusts the amount of hot air sent to the inside of the sleeve 201 through the flow control valve 208 until the temperature inside the shell 203 is within the range of the second temperature threshold set in advance, so as to avoid that the heavy tar in the crude gas adheres to the outlet pipe.

[0026] The method for using the device and the working principle: in use, first, the raw material bin and the input end of the furnace cover 102 are connected, then the ash shell and the sealing ash valve 108 are connected, then the hot air conveying device and the input end of the air filter 111 are connected, then the crude gas treatment device and the output end of the shell 203 are connected, then the conveying pipe and the output end of the sleeve ring 201 are connected, and then the controller 109 and the external power supply are connected. When everything is ready, first, the appropriate amount of pretreated raw materials is released through the raw material bin, the furnace cover 102 and the heat preservation cover 104 to the upper side of the grate 105, then the biomass on the grate 105 is ignited, and after the stable flame appears on the grate 105, the centrifugal fan 112, the main pressure stabilizing valve 116, the main flow regulating valve 117 and the pressure sensor 106 are started through the controller 109. At this time, the centrifugal fan 112 started will extract the hot air in the hot air conveying device through the auxiliary frame 110, the first connecting pipe 113 and the air filter 111, filter and pressurize the hot air to the inside of the multi-way pipe 114. Then, through the main check valve 115, the main pressure stabilizing valve 116, the main flow regulating valve 117 and the second connecting pipe 118, the filtered hot air is conveyed to the inside of the heat preservation layer 103. At this time, the gasifier body 1 can carry out biomass gasification operation. At the same time, the pressure sensor 106 started will continuously detect the pressure between the furnace body shell 101 and the furnace cover 102, and transmit the detected pressure data to the controller 109. The controller 109 will stabilize the pressure in the furnace body shell 101 according to the pressure threshold set in advance and the received pressure data through the main pressure stabilizing valve 116 and the main flow regulating valve 117. At the same time, the ash in the furnace body shell 101 completed by the gasification operation will fall into the ash chamber 107 through the through hole on the grate 105, and then through the controller 109 and the sealing ash valve 108, the ash in the ash chamber 107 can be sealed and discharged under the premise of ensuring the sealing effect of the furnace body shell 101. Then the controller 109 will start the first thermocouple 301 and the second thermocouple 302 at the same time. At this time, the first thermocouple 301 started and the second thermocouple 302 started will continuously detect the temperature on both sides of the heat preservation layer 103, and transmit the detected temperature data to the controller 109. The controller 109 will calculate the two temperature data received, and compare the calculated temperature difference with the first temperature threshold set in advance. When the temperature difference is within the range of the first temperature threshold, the controller 109 will not start the auxiliary electric valve 303. When the temperature difference is greater than the range of the first temperature threshold, the controller 109 will start the auxiliary electric valve 303, the auxiliary pressure stabilizing valve 305 and the auxiliary flow regulating valve 306. At this time, the auxiliary electric valve 303 started will convey the hot air in the multi-way pipe 114 to the other side of the furnace body shell 101 through the auxiliary pressure stabilizing valve 305, the auxiliary flow regulating valve 306, the auxiliary check valve 304 and the guide pipe 307.When the controller 109 receives the temperature data within the second temperature threshold range, the controller 109 does not start the main electric valve 206. When the controller 109 receives the temperature data below the second temperature threshold range, the controller 109 starts the main electric valve 206 and the flow control valve 208. The main electric valve 206, which is started, transports the hot air in the multi-way pipe 114 to the space between the sleeve 201 and the shell 203 through the air pipe 207 and the flow control valve 208 to heat the inside of the shell 203. The second temperature sensor 205, which is started, detects the temperature inside the input end of the shell 203 and transmits the detected temperature data to the controller 109. The controller 109 compares the received temperature data with the second temperature threshold. When the temperature data is below the second temperature threshold range, the controller 109 adjusts the amount of hot air transported to the inside of the sleeve 201 through the flow control valve 208 until the temperature inside the shell 203 is within the second temperature threshold range, so as to avoid the heavy tar in the raw fuel gas from adhering to the outlet pipe.

[0027] The wiring diagram of the pressure sensor 106, the sealing ash discharge valve 108, the controller 109, the centrifugal fan 112, the main pressure stabilizing valve 116, the main flow regulating valve 117, the first temperature sensor 204, the second temperature sensor 205, the main electric valve 206, the flow control valve 208, the first thermocouple 301, the second thermocouple 302, the auxiliary electric valve 303, the auxiliary pressure stabilizing valve 305, and the auxiliary flow regulating valve 306 belongs to the common knowledge in the art, and the working principle thereof is a known technology. The type thereof is selected according to the actual use. Therefore, the control mode and the wiring arrangement of the pressure sensor 106, the sealing ash discharge valve 108, the controller 109, the centrifugal fan 112, the main pressure stabilizing valve 116, the main flow regulating valve 117, the first temperature sensor 204, the second temperature sensor 205, the main electric valve 206, the flow control valve 208, the first thermocouple 301, the second thermocouple 302, the auxiliary electric valve 303, the auxiliary pressure stabilizing valve 305, and the auxiliary flow regulating valve 306 are not explained in detail.

[0028] Although the present application has been described in detail with reference to the foregoing embodiments, the technical solutions recorded in the foregoing embodiments can be modified, or some of the technical features can be replaced by equivalent features, by those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An atmospheric pressure fixed-bed biomass gasifier, comprising a gasifier body (1), characterized in that: The gasifier body (1) is provided with a first auxiliary mechanism (2) and a second auxiliary mechanism (3). The first auxiliary mechanism (2) includes a collar (201), two symmetrical connecting blocks (202) are fixed on the outer wall of the collar (201), a housing (203) is fixed inside the collar (201), a first temperature sensor (204) is installed at the input end mounting hole of the housing (203), a second temperature sensor (205) is installed at the output end mounting hole of the housing (203), a flow control valve (208) is provided below the collar (201), and a vent pipe (207) is installed at both the input and output ends of the flow control valve (208), and a main electric valve (206) is installed at the input end of one of the vent pipes (207). The second auxiliary mechanism (3) includes a first thermocouple (301) and an auxiliary electric valve (303). A second thermocouple (302) is provided opposite to the first thermocouple (301). An auxiliary check valve (304) is provided near the auxiliary electric valve (303). An auxiliary pressure regulating valve (305) and an auxiliary flow regulating valve (306) are provided above the auxiliary check valve (304). A conduit (307) is installed between the auxiliary electric valve (303) and the auxiliary check valve (304), between the auxiliary check valve (304) and the auxiliary pressure regulating valve (305), between the auxiliary pressure regulating valve (305) and the auxiliary flow regulating valve (306), and at the output end of the auxiliary flow regulating valve (306). A perforated seat (308) is provided on the outer wall of the conduit (307) installed at the output end of the auxiliary flow regulating valve (306).

2. The atmospheric pressure fixed-bed biomass gasifier according to claim 1, characterized in that: The gasifier body (1) includes a furnace shell (101), a furnace cover (102) is installed on the top of the furnace shell (101), an insulation layer (103) is provided on the inner wall of the furnace shell (101), an insulation cover (104) is provided on the inner wall of the furnace cover (102), and a grate (105) is installed inside the insulation layer (103).

3. The atmospheric pressure fixed-bed biomass gasifier according to claim 2, characterized in that: A pressure sensor (106) is installed on the outer wall of the furnace shell (101), and the detection end of the pressure sensor (106) moves through the outer wall of the furnace shell (101) and the outer wall of the insulation layer (103) in sequence. An ash chamber (107) is fixed at the lower end of the furnace shell (101).

4. The atmospheric pressure fixed-bed biomass gasifier according to claim 3, characterized in that: A sealed ash discharge valve (108) is installed at the output end of the ash chamber (107), a controller (109) is installed on the outer wall of the furnace shell (101), an auxiliary frame (110) is fixed on the outer wall of the furnace shell (101), and an air filter (111) is installed at the bottom of the inner wall of the auxiliary frame (110).

5. The atmospheric pressure fixed-bed biomass gasifier according to claim 4, characterized in that: A centrifugal fan (112) is installed on the top of the inner wall of the auxiliary frame (110). A first connecting pipe (113) is installed at the input end of the centrifugal fan (112). A multi-port pipe (114) is installed at the output end of the centrifugal fan (112). A main check valve (115) is installed at one of the output ends of the multi-port pipe (114).

6. The atmospheric pressure fixed-bed biomass gasifier according to claim 5, characterized in that: A main pressure regulating valve (116) and a main flow regulating valve (117) are provided above the main check valve (115). A second connecting pipe (118) is installed between the main check valve (115) and the main pressure regulating valve (116), between the main pressure regulating valve (116) and the main flow regulating valve (117), and at the output end of the main flow regulating valve (117).

7. The atmospheric pressure fixed-bed biomass gasifier according to claim 6, characterized in that: The input end of the first connecting pipe (113) is installed with the output end of the air filter (111), and the second connecting pipe (118) installed at the output end of the main flow regulating valve (117) is installed with the gasifying agent inlet end of the furnace shell (101).

8. The atmospheric pressure fixed-bed biomass gasifier according to claim 5, characterized in that: The centrifugal fan (112) is used to pressurize the filtered air and deliver the pressurized air to the interior of the furnace shell (101). Each of the connecting blocks (202) is fixed to the outer wall of the furnace shell (101). The input end of the shell (203) is installed with the crude gas output end on the furnace shell (101).

9. The atmospheric pressure fixed-bed biomass gasifier according to claim 5, characterized in that: The input end of the main electric valve (206) is installed with one of the middle output ends of the multi-port pipe (114), and the first thermocouple (301) and the second thermocouple (302) are both installed on the outer wall mounting point of the furnace shell (101).

10. The atmospheric pressure fixed-bed biomass gasifier according to claim 6, characterized in that: The input end of the auxiliary electric valve (303) is installed with the other output end of the multi-port pipe (114), the perforated seat (308) is installed on the outer wall of the furnace shell (101), the main pressure regulating valve (116) and the auxiliary pressure regulating valve (305) are used to stabilize the positive pressure inside the furnace shell (101), and the output end of the other vent pipe (207) is installed with the input end of the collar (201).

Images