Decoupling type biomass gasification power generation system and multi-parameter cooperative control method

Abstract

The invention belongs to the technical field of biomass energy power generation, and particularly relates to a decoupling type biomass gasification power generation system and a multi-parameter cooperative control method.The method comprises the steps that 1, biomass raw materials are fed into a vertical multi-section decoupling gasification furnace to be gasified, a gasifying agent and water vapor are introduced into the decoupling gasification furnace, and the biomass raw materials are gasified by adjusting the introduction amount of the gasifying agent and the water vapor; the temperature of a reduction zone is controlled to be 700-900 DEG C; 2) cooling a gasification product of the decoupling gasification furnace through a heat exchanger, performing primary filtration through a filter I, removing moisture through a steam-water condensation separator, pressurizing through a Roots blower, performing secondary filtration through a filter II, and feeding into an internal combustion engine for power generation; and (3) gas exhausted by the internal combustion engine is supercharged by an exhaust turbocharger, compressed by a compressed air generator and sent to the decoupling gasifier as a gasifying agent. The system has the advantages that in-situ high-temperature catalytic cracking of tar, efficient utilization of waste heat and stable operation of the system can be realized, the power generation efficiency is improved, and meanwhile, the equipment cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of biomass energy power generation, and particularly relates to a decoupled biomass gasification power generation system and a multi-parameter collaborative control method. Background Art

[0002] Biomass gasification power generation is a clean energy technology that uses biomass resources (such as crop straws, wood wastes, urban organic wastes, etc.) to be converted into combustible gas through gasification reactions, and then drives power generation equipment to generate electricity. Biomass gasification is a thermochemical conversion process. By heating and decomposing biomass under partial oxidation conditions, it is converted into combustible gas (the main components include hydrogen (H2), carbon monoxide (CO), methane (CH4), etc.). The gasification process is usually carried out in an environment of high temperature (700°C - 1000°C) and limited oxygen (or no oxygen). The organic matter in biomass is decomposed into gaseous products, and at the same time, a small amount of solid residues (such as carbon black) and liquid products (such as tar) are produced. Compared with traditional direct combustion of biomass, the gasification power generation process produces fewer pollutants, and the pollutant emissions can be further reduced through a purification system, meeting the environmental protection requirements. At the same time, with the application of biomass gasification power generation systems, some technical defects have also been found:

[0003] 1. Low biomass gasification efficiency: The gasification efficiency of traditional single gasifying agent (oxidant) is low, and the calorific value of the biomass gas is low.

[0004] 2. High energy consumption for tar treatment: The tar generated during the gasification process is a complex organic mixture, which is easy to deposit in equipment, resulting in blockage and corrosion, affecting the stable operation of the system. The existing tar treatment relies on water washing or an electric tar catcher unit, which accounts for 15% - 20% of the total system energy consumption, and is prone to secondary pollution. At the same time, it also increases the operating cost and the capital investment in the gas purification link.

[0005] 3. Large fluctuations in gas quality: Open-loop control leads to fluctuations in the H2 / CO concentration in the gasified gas reaching ±30%, affecting the power generation stability.

[0006] 4. Low waste heat utilization rate: The waste heat recovery rate of the traditional system is less than 40%, the utilization is single, and the overall power generation efficiency is less than 25%. Summary of the Invention

[0007] To overcome the deficiencies of the prior art, the purpose of the present invention is to provide a decoupled biomass gasification power generation system and a multi-parameter collaborative control method, optimize the system structure and multi-parameter collaborative control, and achieve in-situ high-temperature catalytic cracking of tar, efficient utilization of waste heat, and stable operation of the system.

[0008] To achieve the above purpose, the present invention is realized through the following technical solutions:

[0009] A multi-parameter collaborative control method for decoupled biomass gasification power generation, comprising:

[0010] 1) Biomass gasification treatment: Biomass raw materials are fed into a vertical multi-stage decoupled gasification furnace for gasification. Gasifying agent and steam are introduced into the furnace of the vertical multi-stage decoupled gasification furnace. By adjusting the input amounts of the gasifying agent and steam, the temperature in the reduction zone is controlled at 700-900 °C; the air-fuel ratio in the oxidation zone is controlled at 0.25-0.35;

[0011] 2) Flue gas treatment: The gasification products of the vertical multi-stage decoupled gasification furnace are cooled by a heat exchanger, then filtered once by a filter, the moisture is removed by a steam-water condensation separator, pressurized by a Roots blower, filtered twice by a filter two, and sent to an internal combustion engine for power generation, and the intake temperature is stabilized at 35-50 °C;

[0012] 3) Flue gas waste heat utilization: The gas discharged from the internal combustion engine is pressurized by an exhaust gas turbocharger, and then compressed by a compressed air generator and sent as a gasifying agent to the vertical multi-stage decoupled gasification furnace.

[0013] The total spraying amount of the steam introduced into the furnace of the vertical multi-stage decoupled gasification furnace is dynamically regulated based on the fuzzy PID algorithm. The calculation formula for the spraying amount is:

[0014] Q total =Q b +Q pid (1)

[0015] In formula (1), Q total is the total spraying amount, unit: L / min; Q b is the basic spraying amount, unit: L / min; Q pid is the dynamic spraying amount;

[0016] Qb = 0.8×Tgas×ln(P / 101.325P) (2)

[0017] In formula (2), Tgas is the temperature of the gasification furnace, unit: °C; P is the pressure, unit: kPa;

[0018] Q pid = Kp*△t + Ki*∫△t dt (3)

[0019] In formula (3), Q oid is the dynamically adjusted spraying amount, unit: L / min; Kp: proportionality coefficient, dimensionless; Ki: integral coefficient, dimensionless; △t: is the temperature difference between the set value and the actual measured value of the gasification furnace, unit: °C.

[0020] A decoupled biomass gasification power generation system, comprising a vertical multi-stage decoupled gasification furnace, a gas treatment unit, and a flue gas waste heat utilization unit;

[0021] Inside the described vertical multi-stage decoupled gasifier, it is divided into a pyrolysis zone, an oxidation zone, and a catalytic reduction zone from top to bottom by a perforated isolation plate; a decoupling reactor is provided in the reduction zone;

[0022] The described gas treatment unit includes a heat exchanger, a first filter, a steam-water condensation separator, a Roots blower, and a second filter connected in sequence. The vertical multi-stage decoupled gasifier is connected to the heat exchanger, and the heat exchanger is used to reduce the temperature of the gas produced by the vertical multi-stage decoupled gasifier; the outlet of the Roots blower is connected to the internal combustion engine of the flue gas waste heat utilization unit;

[0023] The described flue gas waste heat utilization unit includes an internal combustion engine, an exhaust gas turbocharger, and a compressed air generator. The flue gas treated by the gas treatment unit is input into the internal combustion engine. The exhaust gas turbocharger drives the compressed air generator with the gas discharged from the internal combustion engine, and the compressed gasifying agent output by the compressed air generator is transported to the vertical multi-stage decoupled gasifier.

[0024] A temperature sensor is connected in the oxidation zone, a pressure transmitter is connected in the pyrolysis zone, a spray pipeline is also connected inside the furnace, a high-temperature spray valve is connected to the spray pipeline, and a flow meter is connected to the outlet of the vertical multi-stage decoupled gasifier.

[0025] A gas analyzer is connected to the outlet of the described vertical multi-stage decoupled gasifier.

[0026] The decoupling reactor is filled with a supported nickel-based catalyst.

[0027] The described supported nickel-based catalyst is a nickel-based rare earth element catalyst with a loading of 20% - 25%.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] Through structural optimization and multi-parameter collaborative control, the present invention realizes in-situ high-temperature catalytic cracking of tar, efficient utilization of waste heat, and stable operation of the system, improves power generation efficiency, and reduces equipment costs at the same time. Specific advantages:

[0030] 1. Reducing tar content: The supported nickel-based catalyst has high catalytic activity, good stability and anti-coking performance, a long service life, can effectively crack tar, convert it into small molecule gases, reduce the tar content to 10mg / Nm 3 Below, the tar removal rate reaches more than 99%, almost completely removing tar, with convenient operation, low energy consumption, and no secondary pollution. The traditional water washing / electric tar capture unit equipment is cancelled, and the tar treatment process is optimized.

[0031] 2. Improving power generation efficiency: Through the decoupled gasifier technology, the biomass gasification rate is increased, and the calorific value of the mixed gas is increased, thereby improving the power generation efficiency.

[0032] 3. Improve system stability: Control the fluctuation range of H2 / CO concentration within ±5%. Through the control strategy of the composite gasifying agent, the ratio of H2 / CO can be adjusted between 1 and 2, and the calorific value of the mixed gas can be controlled between 5 and 12 MJ / Nm 3 and the carbon conversion rate can reach 95%, providing multiple mode options for the subsequent utilization of the mixed gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic structural diagram of a decoupled biomass gasification power generation system.

[0034] Figure 2 is a logic block diagram of multi-parameter coordinated control.

[0035] Figure 3 is a graph of tar content of a traditional gasifier and a vertical multi-stage decoupled gasifier.

[0036] In the figure: 1 - decoupled gasifier; 101 - perforated isolation plate; 102 - pyrolysis zone; 103 - oxidation zone; 104 - catalytic reduction zone; 105 - decoupled reactor; 201 - internal combustion engine; 202 - exhaust gas turbocharger; 211 - flue gas of the internal combustion engine; 212 - gasifying agent;

[0037] 3 - control system; 301 - temperature sensor; 302 - pressure transmitter; 303 - high-temperature spray valve; 304 - gas flow meter; 305 - gas analyzer; 306 - air gasifying agent flow meter;

[0038] 4 - gas treatment unit; 401 - heat exchanger; 402 - filter I; 403 - steam-water condensation separator; 404 - Roots blower. DETAILED DESCRIPTION OF THE INVENTION

[0039] The present invention will be described in detail below with reference to the accompanying drawings of the specification, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0040] See Figure 1 , a decoupled biomass gasification power generation system, including a vertical multi-stage decoupled gasifier 1, a gas treatment unit 4, and a flue gas waste heat utilization unit.

[0041] Inside the vertical multi-stage decoupled gasifier 1, the furnace is divided into a pyrolysis zone 102, an oxidation zone 103, and a catalytic reduction zone 104 from top to bottom by a perforated partition plate 101. A decoupling reactor 105 is provided in the reduction zone. The pyrolysis zone 102 is used for the preliminary decomposition of biomass raw materials to generate volatile matter and fixed carbon. The aperture of the perforated partition plate 101 between the pyrolysis zone 102 and the oxidation zone 103 is 1 - 3 cm. The oxidation zone 103 is supplied with a gasifying agent to ensure sufficient oxygen supply to promote the complete combustion of volatile matter and release a large amount of heat. The aperture of the perforated partition plate 101 between the oxidation zone 103 and the catalytic reduction zone 104 is 0.5 - 1 cm, which helps to reduce the gas flow rate in the catalytic reduction zone 104 and extend the contact time between the gas and the catalyst, thereby improving the efficiency of the reduction reaction and generating high-quality biomass mixed gas. In addition, a temperature sensor 301 is connected inside the oxidation zone 103 to collect temperature data of the oxidation zone 103. The pyrolysis zone 102 is connected with a pressure transmitter 302 for monitoring the pressure change in the furnace to prevent the gasification efficiency and safety from being affected by too high or too low pressure. A spray pipeline is also connected inside the furnace, and a high-temperature spray valve 303 is connected to the spray pipeline. The spray amount is calculated according to the detected values of temperature and pressure, and the spray amount is adjusted by adjusting the opening of the high-temperature spray valve 303 in real time to keep the temperature and pressure in the system within the preset safe range. Real-time monitoring and adjustment are carried out through the temperature sensor 301, the pressure transmitter 302, the high-temperature spray valve 303, a gas analyzer 305 connected to the outlet of the decoupled gasifier 1, and a control system to ensure the stability and high efficiency of the gasification process, and reduce energy consumption and emissions. In addition, the control system is also equipped with a fault self-diagnosis function, which can immediately start protection measures (alarm and reduce load when exceeding the set value, and stop the machine in serious cases) when abnormal temperature, pressure, and gas composition are detected to prevent equipment damage or safety accidents from occurring.

[0042] The decoupling reactor 105 is filled with a supported nickel-based catalyst. The supported nickel-based catalyst is a nickel-based rare earth element catalyst with a loading of 20% - 25%. The nickel-based rare earth element catalyst includes by weight percentage: Ni: 20% - 25%; Al2O3: 65% - 70%; MgO: 3% - 5%; SiO2: 2% - 4%; rare earth elements: 2% - 5%. The rare earth elements are mainly Ce, and the rest are La, Nd, Y, or Z.

[0043] Catalyst regeneration: The catalyst is installed in the decoupling structure device, and the temperature is above 650°C basically, and the inactivation is low. If activation is required, calcine at no less than 800°C for more than 2 hours, and the activity is restored to 95% of the initial value.

[0044] The multi-stage decoupled gasifier 1 is a fixed downward-exhaust positive-pressure system. Biomass raw materials enter the furnace from the top of the furnace, and the gasifying agent 212 at about 250 °C is evenly injected from the oxidation zone 103, raising the gasification temperature to above 900 °C. The combustion and pyrolysis of the biomass raw materials proceed simultaneously. After the generated high-temperature gas passes through the catalytic reduction zone 104 of the hot carbon layer, the main components will be reduced to H2 and CO. The tar content in the product gas of the downward-exhaust gasifier is relatively low. With the secondary action of the supported nickel-based catalyst, the tar is almost completely removed.

[0045] The gas treatment unit 4 includes a heat exchanger 401, a filter 402, a steam-water condensation separator 403, a Roots blower 404, and a filter 402 connected in sequence. The vertical multi-stage decoupled gasifier 1 is connected to the heat exchanger 401. The heat exchanger 401 is used to reduce the temperature of the gas produced by the vertical multi-stage decoupled gasifier 1, and an air-water heat exchanger can be used; the outlet of the Roots blower 404 is connected to the internal combustion engine 201 of the flue gas waste heat utilization unit; the outlet of the vertical multi-stage decoupled gasifier is connected with a gas analyzer 305. The response speeds of the temperature sensor 301, the pressure transmitter 302, the high-temperature spray valve 303, and the gas analyzer 305 are < 0.5 s.

[0046] The flue gas waste heat utilization unit includes an internal combustion engine 201, an exhaust gas turbocharger 202, and a compressed air generator. The flue gas treated by the gas treatment unit 4 is input into the internal combustion engine 201. The exhaust gas turbocharger 202 uses the gas discharged from the internal combustion engine 201 to drive the compressed air generator, and the compressed gasifying agent 212 output by the compressed air generator is transported to the vertical multi-stage decoupled gasifier 1.

[0047] See Figure 2 , a multi-parameter collaborative control method for decoupled biomass gasification power generation, including:

[0048] 1) Biomass gasification treatment: Biomass raw materials are fed into the vertical multi-stage decoupled gasifier 1 for gasification. The gasifying agent 212 and steam are introduced into the furnace of the vertical multi-stage decoupled gasifier 1. By adjusting the input amounts of the gasifying agent 212 and steam, the temperature in the reduction zone is controlled at 700 - 900 °C; the air-fuel ratio in the oxidation zone 103 is controlled at 0.25 - 0.35; the residence time in the reduction zone > 10 s.

[0049] The gasifying agent adopts a composite gasifying agent: air + steam. During the gasification of biomass, these two gasifying agents are used simultaneously or alternately. Air serves as an oxidant to provide the necessary oxygen, while steam participates in the reaction as a gasifying agent. Their synergistic effect can significantly improve the gasification efficiency. By adjusting the ratio of air to steam, the contents of H2 and CO in the syngas can be controlled. In addition, the addition of steam helps to regulate the temperature distribution in the gasifier, prevent local overheating, and ensure the stability of the gasification process. The participation of steam in the gasification reaction can also effectively reduce the tar production, improve the quality of the syngas, and reduce the occurrence of coking in the furnace.

[0050] Catalytic cracking can easily degrade relatively stable tar to a great extent. The combustible gas containing tar entering the catalytic reduction zone 104 from the oxidation zone 103 is introduced into the decoupling reactor 105 filled with a supported nickel-based catalyst. By spraying steam, the reaction temperature is controlled at 800 - 950 °C, the gas production is increased to 20% (volume percentage), and the calorific value is increased. The mixed gas leaves the gasifier at a temperature of 800 - 950 °C, realizing in-situ tar cracking (CnHm → CO + H2) and CH4 reforming.

[0051] Adaptive control: During the biomass gasification process, the gasification conditions in the furnace are detected in real time by measuring devices such as the temperature sensor 301, pressure sensor 302, gas analyzer 305, mixed gas flowmeter 305, and air gasifying agent flowmeter 306. According to the different physical and chemical characteristics of different biomass raw materials and different gasifying agent usage strategies, different parameter module units are embedded, and different parameter models and compensation models are established to achieve dynamic parameter adjustment and automatic response following, ensuring that the system can quickly and automatically switch, so as to ensure the stable and efficient gasification process and achieve the optimal control under different working conditions.

[0052] It can be seen from Figure 3 that the tar washing system of the traditional gasifier fails after running for 36 hours, resulting in secondary pollution and a sharp increase in tar content. While starting from running for 36 hours, the vertical multi-stage decoupling gasifier 1 has a multi-parameter closed-loop control response and can almost completely remove tar.

[0053] 2) Flue gas treatment: Before the biomass mixed gas enters the gas internal combustion engine 201 group, most of the dust needs to be removed through a filter, and then it undergoes processes such as condensation dehydration in a dehumidification and cooling system, pressure boosting and dust removal. The gasification product of the vertical multi-stage decoupling gasifier 1 is cooled by the heat exchanger 401 (the heat exchanger 401 can adopt a gas-water heat exchanger), then filtered once by the filter 402, the moisture is removed by the steam-water condensation separator 403, pressurized by the Roots blower 404, and filtered twice by the filter 2, and then sent to the internal combustion engine 201 for power generation, with the intake temperature stabilized at 35 - 50 °C;

[0054] 3) Flue gas waste heat utilization: The gas discharged from the internal combustion engine 201 is pressurized by the exhaust gas turbocharger 202 and then compressed by the compressed air generator and sent as the gasifying agent 212 to the vertical multi-stage decoupled gasifier 1. Gas flow meters 304 are installed on the pipelines such as the outlet of the decoupled gasifier and the inlet of the internal combustion engine to detect the flow data in real time and provide control reference data. The unused exhaust energy can be effectively utilized, especially using the flow energy for gasification and power generation, reducing the external supply energy consumption.

[0055] The use of the composite gasifying agent is based on the air gasifying agent supplemented by high-temperature steam as the auxiliary gasifying agent. Among them, the spraying amount of the steam gasifying agent is dynamically regulated based on the fuzzy PID algorithm. The calculation formula for the spraying amount (also applicable to the use conditions of a single steam gasifying agent) is as follows:

[0056] Q total =Q b +Q pid (1)

[0057] In formula (1), Q total is the total spraying amount, unit: L / min; Q b is the basic spraying amount, unit: L / min; Q pid is the dynamic spraying amount;

[0058] Qb = 0.8×Tgas×ln(P / 101.325P) (2)

[0059] In formula (2), Tgas is the temperature of the gasifier, unit: °C; P is the pressure, unit: kPa;

[0060] Q pid = Kp*△t + Ki*∫△t dt (3)

[0061] In formula (3), Q oid is the dynamically regulated spraying amount, unit: L / min; Kp: proportional coefficient, dimensionless; Ki: integral coefficient, dimensionless; △t: is the temperature difference between the set value and the actual measured value of the gasifier, unit: °C.

[0062] The basic spraying amount provides the basic set spraying amount, and the PID controller adjusts the dynamic spraying amount in real time according to the temperature difference on this basis.

[0063] The control system makes adaptive adjustments: For different biomass raw materials and gasifying agent use strategies, the system parameters are dynamically adjusted to achieve system adaptive following, which can ensure that the system quickly reaches the ideal operating state.

[0064] Reference + feedback control: The empirical model quickly responds to static parameter changes, and the PID controller suppresses dynamic disturbances, improving the system robustness.

[0065] Efficiency and stability: The benchmark value reduces the PID adjustment range to avoid overshoot; dynamically adjusts the compensation for transient errors to ensure stable gas quality. It realizes the intelligent, high-precision, and low-fluctuation operation of the biomass gasification power generation system.

[0066] Extreme working conditions: When the moisture content of biomass > 24%, the gasification efficiency will decrease, the contents of H2 and CO will decline, and the calorific value of the mixed gas will decrease. Adjust the air-fuel ratio to above 0.30, increase the oxygen supply, stabilize the temperature in the furnace, and reduce the variation in the mixed gas data;

[0067] In the initial startup stage of the decoupled biomass gasification power generation system, air is used as the main gasifying agent to rapidly increase the furnace temperature to the operating temperature; after stabilizing the operating temperature, it enters the stable operation stage, and the ratio of air to steam is adjusted according to the target syngas composition. In the load adjustment stage, the gasifying agent ratio is changed to adapt to the raw material characteristics or load changes.

Claims

1. A multi-parameter collaborative control method for decoupled biomass gasification power generation, characterized in that Including: 1) Biomass gasification treatment: The biomass raw materials are fed into a vertical multi-stage decoupled gasification furnace for gasification. Gasifying agent and steam are introduced into the furnace of the vertical multi-stage decoupled gasification furnace. By adjusting the input amounts of the gasifying agent and steam, the temperature in the reduction zone is controlled at 700 - 900 °C; the air-fuel ratio in the oxidation zone is controlled at 0.25 - 0.

35. 2) Flue gas treatment: The gasification products of the vertical multi-stage decoupled gasification furnace are cooled by a heat exchanger, then filtered once by a filter, the moisture is removed by a steam-water condensation separator, pressurized by a Roots blower, filtered twice by a second filter, and sent to an internal combustion engine for power generation. The intake temperature is stabilized at 35 - 50 °C. 3) Flue gas waste heat utilization: The gas discharged from the internal combustion engine is pressurized by an exhaust gas turbocharger, and then compressed by a compressed air generator and sent as the gasifying agent to the vertical multi-stage decoupled gasification furnace.

2. The multi-parameter collaborative control method for decoupled biomass gasification power generation according to claim 1, wherein, The total spraying amount of the steam introduced into the furnace of the vertical multi-stage decoupled gasification furnace is dynamically regulated based on the fuzzy PID algorithm. The calculation formula for the spraying amount is: Q total = Q b + Q pid (1) In formula (1), Q total is the total spraying amount, unit: L / min; Q b is the basic spraying amount, unit: L / min; Q pid is the dynamic spraying volume; Qb = 0.8 × Tgas × ln(P / 101.325P) (2) In formula (2), Tgas is the temperature of the gasification furnace, unit: °C; P is the pressure, unit: kPa. Q pid = Kp * Δt + Ki * ∫Δt dt (3) In formula (3), Q oid is the dynamically adjustable spray volume, unit: L / min; Kp: proportionality coefficient, dimensionless; Ki: integral coefficient, dimensionless. △t: is the temperature difference between the set value and the actual measured value of the gasification furnace, unit: °C.

3. A decoupled biomass gasification power generation system for implementing the multi-parameter collaborative control method according to claim 1 or 2, characterized in that, Including a vertical multi-stage decoupled gasification furnace, a gas treatment unit, and a flue gas waste heat utilization unit; The interior of the furnace of the said vertical multi-stage decoupled gasification furnace is divided into a pyrolysis zone, an oxidation zone, and a catalytic reduction zone from top to bottom by a perforated partition plate; a decoupling reactor is provided in the reduction zone. The said gas treatment unit includes a heat exchanger, a first filter, a steam-water condensation separator, a Roots blower, and a second filter connected in sequence. The vertical multi-stage decoupled gasification furnace is connected to the heat exchanger, and the heat exchanger is used to reduce the temperature of the gas produced by the vertical multi-stage decoupled gasification furnace; the outlet of the Roots blower is connected to the internal combustion engine of the flue gas waste heat utilization unit. The said flue gas waste heat utilization unit includes an internal combustion engine, an exhaust gas turbocharger, and a compressed air generator. The flue gas treated by the gas treatment unit is input into the internal combustion engine. The exhaust gas turbocharger drives the compressed air generator with the gas discharged from the internal combustion engine, and the compressed gasifying agent output by the compressed air generator is transported to the vertical multi-stage decoupled gasification furnace.

4. A decoupled biomass gasification power generation system according to claim 3, characterized in that, A temperature sensor is connected in the oxidation zone, a pressure transmitter is connected in the pyrolysis zone, a spraying pipeline is also connected inside the furnace, a high-temperature spraying valve is connected to the spraying pipeline, and a flowmeter is connected to the outlet of the vertical multi-stage decoupled gasification furnace.

5. The decoupled biomass gasification power generation system according to claim 3, wherein, A gas analyzer is connected to the outlet of the said vertical multi-stage decoupled gasification furnace.

6. The decoupled biomass gasification power generation system according to claim 3, wherein The decoupling reactor is filled with a supported nickel-based catalyst.

7. A decoupled biomass gasification power generation system according to claim 6, characterized in that, The said supported nickel-based catalyst is a nickel-based rare earth element catalyst with a loading amount of 20% - 25%.

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