Gasification furnace for preparing synthesis gas through biomass pyrolysis coupling gasification

Abstract

The invention relates to the technical field of preparation of synthesis gas through biomass gasification, in particular to a gasification furnace for preparation of synthesis gas through biomass pyrolysis coupling gasification, which comprises a gasification furnace, and a feeding system is arranged in the gasification furnace; the gasification furnace comprises a stirring box, a heating box and a discharging box which are sequentially connected from top to bottom; a starting device and an air inlet system are arranged in the heating box; the gas treatment system connected through the gas outlet can be used for treating tar in the synthesis gas; by arranging the double-helix structure controlled by the speed-adjustable motor, the feeding rate can be accurately controlled; through the structure of the stirring box and the heating box which are arranged in a sleeved mode, raw materials can be preheated through high temperature of synthesis gas, and efficient utilization of heat is achieved by reducing the temperature of the synthesis gas; the temperature and pressure monitoring system is arranged in the gasification furnace, the temperature and pressure of all positions in the gasification furnace can be monitored in real time, the starting device, the gas inlet system, the feeding device and the like are accurately controlled through the electric control cabinet, and the device has important value for research in the field of preparation of synthesis gas from biomass.

Description

Technical Field

[0001] The invention relates to the technical field of preparing synthesis gas by gasifying biomass, and in particular to a gasifier for preparing synthesis gas by thermal decomposition coupling gasification of biomass. Background Art

[0002] Biomass materials have the advantages of wide sources, carbon neutrality, large reserves, and short cycle. Biomass will become one of the important raw materials in the future energy and materials fields. The current biomass conversion and utilization field usually uses gasifiers to convert biomass into synthesis gas for downstream processing industries such as urban gas and hydrogen production. Due to the particularity of biomass materials, its feeding and other links are difficult to quantitatively monitor, and there are difficulties in the research on the process optimization of biomass feed quantity, which restricts the development of the field of biomass gasification to prepare synthesis gas.

[0003] In addition, in the process of using gasifiers to prepare synthesis gas, a large amount of tar that is difficult to separate and seriously pollutes will be produced. How to separate, collect and process the tar has also become a difficult problem that restricts the further development and application of biomass gasification synthesis gas technology. Summary of the invention

[0004] The object of the present invention is to provide a biomass pyrolysis coupled gasification gasifier capable of effectively and quantitatively controlling the feed amount and effectively separating tar to prepare synthesis gas.

[0005] Based on the above purpose, the present invention adopts the following technical solution: A biomass pyrolysis coupled gasification gasifier for preparing synthesis gas comprises a gasifier, wherein a feed port is arranged at the top of the gasifier, and a discharge port is arranged at the bottom of the gasifier; a feeding system is arranged in the gasifier, and the feeding system comprises a feeding device matched with the feed port and a discharge device matched with the discharge port; the gasifier comprises a stirring box, a heating box and a discharge box connected in sequence from top to bottom; a starting device is arranged in the heating box, and an air intake system is arranged below the starting device; an air outlet is arranged on the upper side of the gasifier, and the air outlet is connected to a gas treatment system.

[0006] Preferably, the feeding device includes a silo, the bottom of which is connected to the mixing box through a feeding tee; the feeding tee is a T-shaped tee structure, and a primary spiral is coaxially arranged in two coaxial branches of the feeding tee; one end of the primary spiral is connected to a primary spiral motor, and the other end extends into the mixing box.

[0007] Preferably, the feeding device comprises a secondary screw, which is coaxially arranged with the mixing box; a secondary screw motor is arranged on the top of the mixing box, and the output shaft of the secondary screw motor is connected to the secondary screw.

[0008] Preferably, the discharging device includes a discharging tee, one branch of which is connected to the charcoal box; the discharging tee is a T-shaped tee structure, and a discharging spiral is coaxially arranged in the two coaxial branches of the discharging tee, and one end of the discharging spiral is connected to a discharging spiral motor.

[0009] Preferably, the gas processing system includes a tar filtration system connected to the gasifier, and the tar filtration system is connected to the condensation system; the tar filtration system includes a tar filter tank, and a filtration mechanism is arranged in the tar filter tank; the condensation system includes a shell and tube heat exchanger, and the shell and tube heat exchanger is connected to a gas-liquid separator.

[0010] Preferably, the bottom of the mixing box is set to a conical structure, and the top of the heating box is sealed and connected to the maximum diameter of the mixing box; an air outlet is set on the top side of the heating box, and the air outlet is connected to the tar filter tank through a pipeline.

[0011] Preferably, the starting device comprises an electric heating rod, which extends into the heating box.

[0012] Preferably, the air intake system includes an air compressor, which is connected to an air distribution mechanism via a pipeline; the air distribution mechanism is arranged below the starting device in the heating box.

[0013] Preferably, a temperature and pressure monitoring system is provided in the gasifier, and the temperature and pressure monitoring system includes a temperature detection mechanism and a pressure detection mechanism; the temperature detection mechanism includes a plurality of thermocouples arranged vertically in the heating box, and the pressure detection mechanism includes a pressure sensor provided at the top of the gasifier and at the starting device.

[0014] Preferably, the gasifier is connected to an electric control cabinet, in which a temperature monitoring module, a pressure monitoring module, a heating control module, a flow display module, a pore switch module, an analog input and output module, and a digital input and output module are arranged.

[0015] The beneficial effects of the present invention include: The present invention is applicable to the process of preparing synthesis gas from biomass, and can achieve various process research purposes in the field of preparing synthesis gas from biomass gasification; by arranging a double-screw feeding device, the spiral feeding amount can be controlled, thereby realizing the research on the process optimization of the biomass feeding amount and exploring the optimal feeding rate; by being equipped with a detachable silo, the continuity of the silo feeding can be directly observed.

[0016] In the present invention, a conical structure is arranged at the bottom of the mixing box, and the top of the heating box is sleeved on the outer side of the bottom cone of the mixing box, so that the high-temperature gas generated by gasification can exchange heat with the material in the mixing box, thereby reducing the gas temperature at the gas outlet, and at the same time heats the material that has not yet entered the heating box, so that the moisture therein evaporates in advance; the heat utilization rate in the gasifier of the present invention is higher, and the efficiency of biomass gasification treatment is effectively improved.

[0017] The present invention arranges a tar filtering system between the gas outlet and the condensation system, and the tar in the synthesis gas can be preliminarily absorbed, filtered and collected by the filter plate and filter filler arranged in the tar filter tank; the filter filler is composed of the biomass raw material to be reacted, which can be preheated by the synthesis gas before feeding, and can also reduce the temperature of the synthesis gas, so that the overall energy utilization efficiency of the device is higher; then, through the shell and tube heat exchanger and the gas-liquid separator in the condensation system, the tar and other components in the gas are further removed, which effectively reduces the tar content in the output gas, improves the purity of the output gas, and reduces pollution in the production process.

[0018] The present invention is equipped with a comprehensive temperature and pressure sensing and metering system. By arranging a plurality of thermocouples and pressure sensors in the gasifier, the temperature and pressure of various parts of the gasifier can be monitored in real time. By arranging a flow meter at the end of the condensation system and at the air inlet of the gasifier, the gas inlet and outlet of the gasifier can be accurately metered. Combined with the electric control cabinet, the information of sensors and flow meters in various places can be collected in real time, and the starting device, air intake system, feeding device, etc. can be accurately controlled, which can meet various research and experimental requirements in the field of preparing synthesis gas by thermal decomposition and gasification of biomass, and has important value for the research in the field of preparing synthesis gas from biomass. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention; Figure 2 This is a front view of Embodiment 1 of the present invention; Figure 3 It is a side view of embodiment 1 of the present invention; Figure 4 This is a partial enlarged view of the feeding device of Example 1 of the present invention; Figure 5 This is a partial enlarged view of the internal structure of the heating box of Example 1 of the present invention; Figure 6 This is a partial enlarged view of the discharge device of Example 1 of the present invention; Figure 7 It is a partial structural side view of Embodiment 2 of the present invention; Figure 8 This is a partial front view of a silo according to Embodiment 2 of the present invention; Fig. 9 It is a partial enlarged view of the internal structure of the gasifier of Example 2 of the present invention; Fig.10 This is a partial enlarged view of the air distribution plate structure inside the discharge box of Example 2 of the present invention; Fig.11This is a partial enlarged view of the internal discharge spiral structure of the discharge box of Example 2 of the present invention; Fig.12 This is a partial enlarged view of the internal structure of the discharge device of Example 2 of the present invention.

[0020] In the figure: silo 1; gasifier 2; secondary screw motor 21; secondary screw 211; stirring box 22; air outlet 221; heating box 23; air bag 24; discharge box 25; thermocouple 26; electric heating rod 27; level meter 28; pressure sensor 29; feeding device 3; primary screw motor 31; feeding valve 32; primary screw 33; discharge device 4; discharge screw motor 41; charcoal box 42; discharge valve 43; discharge screw 44; primary charcoal box 45; secondary charcoal box 46; air compressor 5; air inlet pipe 51; air distribution pipe 52; air distribution plate 53; tar filter tank 6; condensation system 7; main frame 8; electric control cabinet 9. DETAILED DESCRIPTION

[0021] Example 1 The following is a further explanation of the present invention in conjunction with specific embodiments. Figure 1 As shown, this embodiment is a biomass thermal decomposition coupled gasification gasifier for preparing synthesis gas, which is mainly used for gasification treatment of biomass raw materials to prepare synthesis gas; it mainly includes a gasifier 2, and the gasifier 2 is vertically installed through a two-story main frame 8.

[0022] A silo 1 is provided on the upper layer of the main frame 8, and the silo 1 is used to store biomass raw materials; the silo 1 is connected to the gasifier 2 through a feeding device 3, and the biomass raw materials can be filled into the gasifier 2 for gasification treatment through the feeding device 3; at the bottom of the gasifier 2, a discharging device 4 is connected, and the discharging device 4 can discharge the carbon slag after gasification from the gasifier and pour it into a carbon box 42 for collection; a gas treatment system is connected to the top of the gasifier 2, including a tar filter tank 6 and a condensation system 7; a filter plate and a filter filler are provided in the tar filter tank 6, which can perform preliminary filtering, absorption and collection of tar in the synthesis gas; the filter filler is selected from the biomass raw materials to be reacted, which can reduce the temperature of the synthesis gas and preheat the biomass raw materials to evaporate the water inside, thereby improving the energy utilization rate; the condensation system 7 includes a shell and tube heat exchanger and a gas-liquid separator, which can further separate the tar and other solids and liquids in the synthesis gas, thereby finally producing pure synthesis gas.

[0023] like Figure 2 and Figure 3As shown, the gasifier 2 is divided into three parts from top to bottom, namely a mixing box 22, a heating box 23 and a discharge box 25; the mixing box 22 is connected to the silo 1 through a feeding device 3, a starting device is provided in the heating box 23 to ignite the biomass raw material, and the discharge box 25 is connected to the discharge device 4; the bottom of the heating box 23 is also connected to the air compressor 5 through an air bag 24, so that air can be provided to the heating box 23 from the bottom for internal gasification consumption.

[0024] like Figure 4 As shown, the feeding device 3 includes a feeding tee, which is a T-shaped structure, and a primary spiral 33 is coaxially arranged in its two coaxial branches; one end of the primary spiral 33 is connected to a primary spiral motor 31, and the other end is connected to the mixing box 22 of the gasifier 2; the primary spiral 33 can be driven to rotate by the primary spiral motor 31, and the other end of the primary spiral 33 extends into the mixing box 22, and the material can be pushed from the tee into the mixing box 22 by rotating the primary spiral 33; the other branch of the feeding tee is connected to the silo 1 through the feeding valve 32, and the opening and closing of the silo 1 can be controlled by controlling the feeding valve 32; a secondary spiral motor 21 is coaxially arranged at the top of the mixing box 22, and the bottom output shaft of the secondary spiral motor 21 is connected to the secondary spiral 211; the secondary spiral 211 can rotate under the drive of the secondary spiral motor 21, so as to realize the stirring of the material in the mixing box 22 and push the material downward to leave the mixing box 22 and enter the heating box 23.

[0025] The bottom end of the stirring box 22 is set as a conical structure, and the top end of the heating box 23 is connected to the largest diameter of the stirring box 22, that is, the top of the heating box 23 is arranged outside the bottom conical structure of the stirring box 22; an air outlet 221 is set on the top side of the heating box 23, and the air outlet 221 is connected to the tar filter tank 6 through a pipeline to discharge the synthesis gas generated by the gasification reaction; when the synthesis gas generated by the gasification reaction in the heating box 23 moves upward to the intersection of the stirring box 22 and the heating box 23, the biomass raw material in the stirring box 22 can be preheated to evaporate the water inside it, and the temperature of the synthesis gas can be reduced to achieve effective exchange and utilization of heat.

[0026] like Figure 5As shown, a starting device and an air intake system are provided at the bottom of the heating box 23. The starting device includes a plurality of electric heating rods 27, which can realize the starting and ignition of material gasification and the heat supplement in the combustion gasification process; a plurality of air distribution ducts 52 are provided below the starting device, and the air distribution ducts 52 are connected to the air compressor 5 through the air bag 24 (the connecting pipeline diagram is not shown); the air distribution ducts 52 are provided with air holes on the side walls inside the heating box 23, and air can be provided to the inside of the heating box 23 from below for consumption by the gasification reaction; the heating box 23 is configured as a double-layer structure, and is provided with a flame-retardant layer (not shown in the figure), and the electric heating rods 27 and the thermocouples 26 are all arranged through the gaps in the flame-retardant layer; and the heating box 23 is designed with a variable diameter, and its diameter is narrow at the top and wide at the bottom.

[0027] like Figure 6 As shown, the discharging device 4 includes a discharging tee, which is a T-shaped structure, and a discharging screw 44 is arranged in two coaxial pipes, and the other pipe is connected to the end of the discharging box 25; one end of the discharging screw 44 is connected to the discharging screw motor 41, which can rotate under the drive of the discharging screw motor 41, so as to discharge the material in the discharging tee to the outside; the other end of the discharging tee is the outlet, and a charcoal box 42 is arranged therewith; the discharging screw 44 pushes the remaining charcoal after the gasification reaction of the biomass raw material to be discharged from the discharging tee, and finally collected through the charcoal box 42.

[0028] In this embodiment, a temperature and pressure monitoring system is provided, including a plurality of thermocouples 26 provided in the gasifier 2, such as Figure 2 As shown; in this embodiment, a total of five thermocouples are arranged vertically from top to bottom and inserted into the interior of the gasifier 2, so as to monitor the temperature of various places inside the gasifier 2 in real time; a pressure sensor is arranged on the top of the gasifier 2 to collect the pressure information of the top of the gasifier 2, and an ultra-high temperature pressure sensor is also arranged at the starting device, which is arranged on the side intersection surface of the electric heating rod 27 to collect the pressure information at the starting device.

[0029] In actual use of this embodiment, the biomass raw material is first added to the silo 1, and then the gasifier 2 can be controlled to start working through the electric control cabinet 9 arranged in the lower layer; first, the feed valve 32 is controlled to open to allow the raw material to enter the feed tee; then the first-level screw motor 31 is turned on to make the first-level screw 33 work to push the raw material into the mixing box 22 of the gasifier 2; the second-level screw motor 21 is controlled to work to make the second-level screw 211 work to stir the raw material in the mixing box 22 and push it downward into the heating box 23.

[0030] The start-up device is controlled by the electric control cabinet 9, and the electric heating rod 27 is powered on; during the early start-up, the furnace needs to be warmed up first, and the oxygen (i.e., air) supply is kept sufficient through the air intake system. At this time, more heat is generated, so that the internal temperature of the gasifier 2 is quickly raised to the gasification temperature, and the air supply of the air intake system is reduced, and only part of the oxygen is supplied, so as to achieve the gasification effect; the synthesis gas produced by gasification moves upward to the top of the heating box 23 and is discharged through the air outlet 221, and the remaining carbon residue moves downward into the discharge box 25; open the discharge valve 43, and the carbon residue can enter the discharge tee; turn on the discharge screw motor 41, control the rotation of the discharge screw 44, and the carbon residue can be discharged from the discharge tee to the carbon box for collection.

[0031] The synthesis gas generated by gasification is discharged through the gas outlet 221 and enters the tar filter tank 6. The tar in the synthesis gas is preliminarily filtered and collected through the filter plate and filter filler in the tar filter tank 6. The synthesis gas continues to enter the condensation system, and is processed by the shell and tube heat exchanger and the gas-liquid separator in turn to obtain pure synthesis gas, which finally enters the inspection link or is burned and exhausted through the flow meter.

[0032] The motors used in this embodiment are all adjustable speed motors, and are controlled by the electric control cabinet 9, which can accurately control the screw speed to adjust the feeding and discharging speeds; the thermocouple 26 and the pressure sensor arranged in the gasifier 2 can monitor the temperature and pressure conditions at various places in the gasifier in real time, and feedback to the operator through the electric control cabinet 9; the control system in the electric control cabinet 9 adopts the AI ​​intelligent instrument development solution and is controlled by a manual device; the AI ​​intelligent instrument module adopts a single-body control, and the interference between the modules is small and the stability is high; the main modules include a temperature monitoring module, a pressure monitoring module, a speed adjustment module, a heating control module, a flow display module, a pore switch module, an analog input and output module, and a digital input and output module, which can realize all-round data monitoring and reaction control; and a safety control mechanism is provided, when the system detects that the temperature reaches the high limit (Hi), it will issue an audible and visual alarm to remind the operator to handle it; when the system detects that the temperature reaches the high limit (HiHi), it will actively cut off the power supply of the electric heating rod 27 and take more relevant logical operations to prevent accidents.

[0033] Example 2 The difference between this embodiment and embodiment 1 is that a different feeding system and air distribution mechanism are used in this embodiment; Figure 7 As shown ( Figure 7 The structure that is substantially the same as that of Example 1 is omitted), the discharge tee in this embodiment is a Y-shaped structure, and its two coaxial branches are coaxially connected to the discharge box 25, and the obliquely connected branches are sequentially connected to the primary carbon box 45 and the secondary carbon box 46; Figure 8As shown, the tar filter tank 6 in this embodiment is designed to be integrated with the silo 1, and the tar filter tank 6 is arranged above the silo 1, and an electromagnetic valve control switch is arranged between the two, so that the biomass raw material used as filter filler in the tar filter tank 6 can automatically and directly enter the silo 1 for standby after being preheated by heat exchange with the synthesis gas.

[0034] like Fig. 9 As shown, the secondary spiral 211 in this embodiment extends downward into the heating box 23, and can further push and stir the material in the heating box 23; level meters 28 are respectively provided in the middle of the heating box 23 and the middle of the stirring box 22. The level meters 28 can monitor the material heights in the heating box 23 and the stirring box 22, thereby controlling the feeding work of the primary spiral 33 and the secondary spiral 211.

[0035] like Fig.10 As shown, in this embodiment, an air distribution plate 53 is used to supply air to the gasifier 2, and the air distribution plate 53 is a conical structure that cooperates with the discharge box 25; the air distribution plate 53 is sleeved inside the discharge box 25, and its top and bottom ends are fixedly connected to the inner wall of the discharge box 25; a through hole is opened on the side wall of the air distribution plate 53, and an air inlet pipe 51 is arranged on the side wall of the discharge box 25; the air inlet pipe 51 is connected to the air compressor 5, and air can be provided to the discharge box 25 through the air compressor 5, and uniform and stable air can be further provided to the discharge box 25 through the through holes on the air distribution plate 53.

[0036] like Fig.11 and Fig.12 As shown, in this embodiment, the discharging screw 44 is coaxially arranged with the discharging box 25, and the discharging screw 44 extends upward into the discharging box 25; the spiral plate on the discharging screw 44 is divided into three sections from top to bottom, the first section is a section inside the discharging box 25, and its diameter matches the inner diameter of the discharging box 25, and it presents a uniform variable diameter structure from top to bottom; the second section is the upper half of the discharging tee, and its spiral plate diameter matches the inner wall of the pipe of the discharging tee and is uniformly arranged; the third section is the lower half of the discharging tee, specifically the part below the oblique branch pipe; the rotation direction of the spiral plate of the third section is opposite to that of the first two sections, and its pitch is shorter than that of the second section; the second section and the third section of the spiral plate rotate in opposite directions, and can provide downward and upward thrusts at the same time on the basis of using the same motor drive, so as to push the remaining carbon slag from gasification to the oblique branch pipe in the middle; compared with the discharging device of Example 1, the discharging device of this embodiment has smoother discharging and better sealing.

[0037] In actual use, the feeding, gas discharge and treatment processes of this embodiment are basically the same as those of Example 1; the difference is that the secondary spiral 211 in this embodiment still pushes the material to stir in the heating box 23, which helps to fully and quickly gasify the material; during the discharging process, the discharging spiral 44 extends into the discharging box 25, which can provide additional thrust to help push the carbon slag downward and quickly enter the discharging tee and quickly discharge from the gasification furnace 2; the end of the inclined branch pipe of the discharging tee is connected to the primary carbon box 45, and the primary carbon box 45 is connected to the secondary carbon box 46 through the discharging valve 43. The remaining carbon slag can be cached through the primary carbon box 45 when the machine is shut down, thereby avoiding the risk of carbon slag accumulating in the discharging tee and causing the operation of the discharging spiral 44 to be blocked or damaged.

[0038] The above description is only a further explanation of the present invention in combination with specific embodiments. All descriptions do not limit the scope of protection of the present invention. Any changes or replacement schemes that can be easily thought of by any technician in this field within the technical scope disclosed by the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A biomass thermal decomposition coupled gasification gasifier for preparing synthesis gas, comprising a gasifier, characterized in that: The gasifier is provided with a feed port at the top and a discharge port at the bottom; a feeding system is provided in the gasifier, and the feeding system includes a feeding device cooperating with the feed port and a discharge device cooperating with the discharge port; the gasifier includes a stirring box, a heating box and a discharge box connected in sequence from top to bottom; a starting device is provided in the heating box, and an air intake system is provided below the starting device; an air outlet is provided on the upper side of the gasifier, and the air outlet is connected to a gas treatment system.

2. The biomass thermal decomposition coupled gasification gasifier for preparing synthesis gas according to claim 1, characterized in that: The feeding device includes a silo, the bottom of which is connected to the mixing box via a feeding tee; the feeding tee is a T-shaped tee structure, and a primary spiral is coaxially arranged in two coaxial branch pipes of the feeding tee; one end of the primary spiral is connected to a primary spiral motor, and the other end extends into the mixing box.

3. The biomass thermal decomposition coupled gasification gasifier for preparing synthesis gas according to claim 2, characterized in that: The feeding device comprises a secondary screw, and the secondary screw is coaxially arranged with the mixing box; a secondary screw motor is arranged on the top of the mixing box, and the output shaft of the secondary screw motor is connected with the secondary screw.

4. The biomass thermal decomposition coupled gasification gasifier for preparing synthesis gas according to claim 1, characterized in that: The discharging device comprises a discharging tee, one branch of which is connected to a charcoal box; the discharging tee is a T-shaped tee structure, a discharging screw is coaxially arranged in two coaxial branches of the discharging tee, and one end of the discharging screw is connected to a discharging screw motor.

5. The biomass thermal decomposition coupled gasification gasifier for preparing synthesis gas according to claim 1, characterized in that: The gas treatment system includes a tar filtration system connected to the gasifier, and the tar filtration system is connected to a condensation system; the tar filtration system includes a tar filtration tank, and a filtration mechanism is arranged in the tar filtration tank; the condensation system includes a shell and tube heat exchanger, and the shell and tube heat exchanger is connected to a gas-liquid separator.

6. The biomass thermal decomposition coupled gasification gasifier for preparing synthesis gas according to claim 5, characterized in that: The bottom of the mixing box is set as a conical structure, and the top of the heating box is sealed and connected to the largest diameter of the mixing box; an air outlet is set on the top side of the heating box, and the air outlet is connected to the tar filter tank through a pipeline.

7. The biomass thermal decomposition coupled gasification gasifier for preparing synthesis gas according to claim 1, characterized in that: The starting device comprises an electric heating rod, and the electric heating rod extends into the heating box.

8. The biomass thermal decomposition coupled gasification gasifier for preparing synthesis gas according to claim 1, characterized in that: The air intake system includes an air compressor, and the air compressor is connected to an air distribution mechanism through a pipeline; the air distribution mechanism is arranged below the starting device in the heating box.

9. The biomass thermal decomposition coupled gasification gasifier for preparing synthesis gas according to claim 1, characterized in that: A temperature and pressure monitoring system is provided in the gasifier, and the temperature and pressure monitoring system includes a temperature detection mechanism and a pressure detection mechanism; the temperature detection mechanism includes a plurality of thermocouples arranged vertically in a heating box, and the pressure detection mechanism includes pressure sensors provided at the top of the gasifier and at a starting device.

10. The biomass thermal decomposition coupled gasification gasifier for preparing synthesis gas according to claim 9, characterized in that: The gasifier is connected to an electric control cabinet, in which a temperature monitoring module, a pressure monitoring module, a heating control module, a flow display module, a pore switch module, an analog input and output module, and a digital input and output module are arranged.

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