Fluidized bed pyrolysis gasification system with micro-positive pressure feeding

Abstract

The utility model discloses a fluidized bed pyrolysis gasification system with micro-positive pressure feeding. The fluidized bed pyrolysis gasification system comprises a low-resistance fluidized bed pyrolysis gasification furnace, a micro-positive pressure feeding device, a fuel gas outlet pipeline and a material outlet pipeline, the section size of a hearth of the low-resistance fluidized bed pyrolysis gasification furnace is large in the upper portion and small in the lower portion, the top of the hearth of the low-resistance fluidized bed pyrolysis gasification furnace is connected with a fuel gas outlet pipeline, and the lower portion of the hearth of the low-resistance fluidized bed pyrolysis gasification furnace is connected with a material outlet pipeline and a micro-positive-pressure feeding device. Based on the system provided by the utility model, the system resistance of the pyrolysis gasifier is reduced, and the operating cost is reduced; a method of combining a low-resistance pyrolysis gasification furnace and a micro-positive pressure fluidized bed feeding device is adopted, so that the feeding stability is improved, and flue gas backflow at a feeding port is reduced; flue gas flow speed on the upper portion of the hearth can be effectively reduced, ash concentration on the upper portion of the hearth is further reduced, and pressure of a feeding port is reduced. The feeding problem of the pyrolysis gasifier is solved, and stable operation of the system is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of biomass and solid waste utilization, and particularly relates to a micro-positive-pressure feeding fluidized bed pyrolysis gasification system. BACKGROUND

[0002] After the biomass or solid waste is treated through pyrolysis gasification, the generated fuel gas can be sent to a boiler for combustion utilization, and the solid product after pyrolysis can be used as a resource or burned.

[0003] The existing fluidized bed pyrolysis gasification furnace adopts a fluidized bed technology to realize efficient treatment of garbage incineration or materials, adopts a non-uniform air distribution differential fluidized bed, and an efficient vortex combustion chamber. The outlet of the combustion chamber is connected with a high-temperature cyclone separator, and the lower end of the cyclone separator is connected with the inlet of a return feeder, and the outlet of the return feeder is connected with the differential fluidized bed again through a return pipe, forming a closed loop system. It ensures that the material can undergo a sufficient gasification and pyrolysis process in the fluidized bed. At the same time, through the synergistic effect of the cyclone separator and the return feeder, the flow and reaction conditions of the material are precisely controlled. When the fluidized bed pyrolysis gasification furnace is working, the material is uniformly heated in the fluidized bed, thereby triggering a gasification reaction, and the generated combustible gas is effectively collected and can be used for power generation or heating purposes; and the remaining solid residues are safely discharged through a special slag discharge system, not only having excellent garbage treatment capacity, but also significantly reducing the impact on the environment, while realizing the recycling of resources.

[0004] The entire system has the ability to run continuously and can flexibly adapt to various types of garbage and material processing needs, demonstrating its excellent versatility and adaptability. One technical difficulty of the fluidized bed pyrolysis gasification furnace is the feeding problem, mainly manifested as smoke backflow and feeding port blockage, which is related to the characteristics of biomass materials or solid waste and the positive pressure operation of the pyrolysis gasification furnace. UTILITY MODEL CONTENTS

[0005] To solve the above problems, the utility model provides a micro-positive-pressure feeding fluidized bed pyrolysis gasification system, and the outlet of the pyrolysis gasification furnace hearth is not provided with a cyclone separator, but a fluidized bed with an upper large lower small hearth structure is adopted, which can effectively reduce the flue gas flow rate at the upper part of the hearth, thereby reducing the ash concentration at the upper part of the hearth, so as to reduce the feeding port pressure. On the other hand, a Venturi structure feeding pipe structure is adopted, a negative pressure is formed at the throat part, and the problem of biomass or solid waste material blockage can be avoided.

[0006] To achieve the above object, the utility model discloses technical scheme is: a micro positive pressure feeding fluidized bed pyrolysis gasification system, including low resistance fluidized bed pyrolysis gasification furnace, micro positive pressure feeding device, gas outlet pipeline and material outlet pipeline, the hearth cross section size of low resistance fluidized bed pyrolysis gasification furnace is big down small, the hearth top of low resistance fluidized bed pyrolysis gasification furnace is connected gas outlet pipeline, and the hearth lower part of low resistance fluidized bed pyrolysis gasification furnace is connected material outlet pipeline and micro positive pressure feeding device.

[0007] Further, the hearth cross section shape of low resistance fluidized bed pyrolysis gasification furnace is rectangular or circular.

[0008] Further, the material outlet pipeline is located within 300mm below the air distribution device, and the micro positive pressure feeding device is located 2-4m above the air distribution device.

[0009] Further, a Venturi tube is provided on the conveying pipeline of the micro positive pressure feeding device, the throat of the Venturi tube is connected to the biomass or solid waste dropping pipe, the feeding position of the micro positive pressure feeding device is micro negative pressure, and other parts are micro positive pressure. When the fluidized state physical passes through the throat of the Venturi tube, a local low-pressure area is generated due to the increase of flow rate. The throat of the Venturi tube is connected to the dropping pipe of the biomass or solid waste. When the material passes through the Venturi tube, a low-pressure area is formed at the throat. The low-pressure area helps to extract the biomass or solid waste particles from the dropping pipe. Due to the low-pressure effect of the throat, the biomass or solid waste particles are more easily carried by the airflow. The feeding position of the micro positive pressure feeding device is designed to be micro negative pressure, and other parts are micro positive pressure, which helps to maintain the stability and efficiency of the system.

[0010] Further, the material outlet pipeline is made of heat-resistant steel within a range of 400-500mm close to the inlet section of the pyrolysis gasification furnace.

[0011] Further, temperature measuring points are arranged at the air distribution device, the middle part of the hearth and the hearth outlet. The number of temperature measuring points at the lower part of the hearth is arranged to be 6-12 according to the size of the pyrolysis gasification furnace.

[0012] Further, pressure measuring points are arranged at the hearth air chamber, the lower part of the hearth, the feeding port of the hearth, the middle part of the hearth and the hearth outlet.

[0013] Further, the hearth adopts an adiabatic structure, the fire side adopts high-strength wear-resistant plastic or wear-resistant refractory castable, and the inner layer adopts heat-insulating castable.

[0014] Further, during operation, the biomass or solid waste material passing through the micro positive pressure feeding device is sent into the low resistance fluidized bed pyrolysis gasification furnace through the micro positive pressure feeding device to perform pyrolysis gasification. The gas after gasification is sent to the boiler for incineration through the gas outlet pipeline. The material after pyrolysis gasification is sent to the storage device or the boiler for incineration disposal through the material outlet pipeline.

[0015] Further, the upper part of the hearth hot flue gas flow rate 2.5m / s~5m / s, the lower part of the hearth flue gas flow rate 3~6m / s.

[0016] Compared with the prior art, the utility model has the following beneficial effects: the system reduces the system resistance of the pyrolysis gasification furnace, and reduces the operation cost; the low-resistance pyrolysis gasification furnace and the micro-positive pressure fluidized bed feeding device are combined, the feeding stability is improved, and the smoke backflow at the feeding port is reduced; the flue gas flow rate of the upper part of the furnace can be effectively reduced, and the ash concentration of the upper part of the furnace is reduced, thereby reducing the feeding port pressure.

[0017] Further, the Venturi structure feeding pipe structure is adopted, and the negative pressure is formed at the throat part, so that the biomass or solid waste material blocking problem can be avoided.

[0018] The micro-positive pressure feeding device is responsible for sending the biomass or solid waste material into the fluidized bed pyrolysis gasification furnace in a micro-positive pressure mode, the micro-positive pressure environment helps to prevent external air or impurities from entering, ensures the purity and continuity of the material conveying, the pyrolysis gasification of the material is realized in the furnace through the fluidized bed technology, the fluidized bed technology can provide uniform heat distribution and efficient material mixing, helps to improve the pyrolysis gasification efficiency and product quality, the low-resistance design reduces the energy consumption, improves the overall performance of the system, the gasification gas enters the boiler for incineration through the pipeline, the biomass or solid waste material is sent into the fluidized bed pyrolysis gasification furnace through the micro-positive pressure feeding device, the micro-positive pressure environment ensures the stability and continuity of the material conveying, in the fluidized bed pyrolysis gasification furnace, the material is pyrolyzed and gasified under the action of high temperature and the fluidized bed, and fuel gas and solid residues are generated; the gasification gas enters the boiler for incineration through the gas outlet pipeline, and heat energy is generated; the pyrolysis gasification material enters the storage device through the material outlet pipeline for temporary storage, the gasification gas is recycled and utilized, environmental pollution is reduced, the micro-positive pressure feeding device ensures the stability and continuity of the material conveying, and the overall performance of the system is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the overall structure schematic diagram of the utility model.

[0020] In the drawing: 1-low-resistance fluidized bed pyrolysis gasification furnace, 2-micro-positive pressure feeding device, 3-gas outlet pipeline, 4-material outlet pipeline. DETAILED DESCRIPTION

[0021] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be clearly and completely described below, obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0022] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "inner", "outer", "one side", "one end", "one edge" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0023] The biomass material properties can be improved by crushing the material, and the magnitude of the operating positive pressure of the pyrolysis gasification furnace can be reduced by improving the structure of the fluidized bed to reduce the operating positive pressure value. The surface area of the crushed material increases, which helps to accelerate the pyrolysis reaction process and improve the gasification efficiency, and smaller particle sizes also help to uniformly distribute and flow the material in the fluidized bed, thereby improving the effect of the entire gasification process; the pyrolysis gasification furnace is used to convert biomass into combustible gas, and in this process, a positive pressure is maintained in the furnace to ensure that the material can move smoothly downward and complete the pyrolysis reaction, however, too high a positive pressure can adversely affect the operation and service life of the equipment, such as increased energy consumption, equipment leakage and other problems, the present application sets a micro-positive pressure feeding device, and the separator at the flue gas outlet is removed, which can effectively reduce the required operating positive pressure value. While ensuring the gasification efficiency, the pressure requirement for the operation of the equipment is reduced, thereby improving the safety and economy of the operation.

[0024] The utility model provides a kind of micro-positive pressure feeding's fluidized bed pyrolysis gasification system, including low-resistance fluidized bed pyrolysis gasification furnace 1, micro-positive pressure feeding device 2, gas outlet pipeline 3 and material outlet pipeline 4;Low-resistance fluidized bed pyrolysis gasification furnace 1 hearth outlet is not equipped with high-temperature cyclone separator, system flue gas resistance is smaller, simultaneously that is reduced biomass feeding port place flue gas pressure, so that flue gas pressure at feeding port is in micro-positive pressure state The pressure range of the micro-positive pressure is 1~2kPa, it is convenient for the feeding of biomass material, effectively prevent flue gas backflow. Low-resistance fluidized bed pyrolysis gasification furnace 2 is used to pyrolysis gasification solid waste or biomass, obtains high-temperature solid waste gasification gas rich in CO, H2, CH4 And have a certain calorific value pyrolysis solid product.

[0025] Example 1, as Figure 1As shown, a micro-positive pressure feeding fluidized bed pyrolysis gasification system includes a low-resistance fluidized bed pyrolysis gasification furnace 1, a micro-positive pressure feeding device 2, a fuel gas outlet pipeline 3, and a material outlet pipeline 4; wherein the low-resistance fluidized bed pyrolysis gasification furnace 1 is used for gasifying biomass or solid waste to obtain gasification fuel gas; the hearth cross-sectional shape of the low-resistance fluidized bed pyrolysis gasification furnace 1 is circular, the low-resistance fluidized bed pyrolysis gasification furnace 1 is connected with the micro-positive pressure feeding device 2, the low-resistance fluidized bed pyrolysis gasification furnace is connected with the fuel gas outlet pipeline 3, and the low-resistance fluidized bed pyrolysis gasification furnace 1 is connected with the material outlet pipeline 4.

[0026] The hearth structure of the low-resistance fluidized bed pyrolysis gasification furnace 1 adopts a circular or rectangular cross section, the hearth adopts an adiabatic structure, the fire side adopts high-strength wear-resistant plastic or wear-resistant castable refractory, and the inner layer adopts insulation castable. The whole hearth adopts a support structure. The flue gas flow rate in the hearth is low, and the overall resistance is small. At the outlet of the hearth, no separate cyclone separator is arranged to further reduce the flue gas resistance. The circular cross section is more uniform in fluid mechanics, which helps to reduce the vortex and resistance of the flue gas in the hearth; the rectangular cross section is convenient for the manufacture, installation and maintenance of the equipment, and can also optimize the space utilization inside the hearth to a certain extent. The whole hearth adopts an adiabatic structure to reduce heat loss and improve the thermal efficiency of the pyrolysis gasification furnace. The selection of the adiabatic material should comprehensively consider its thermal conductivity, high-temperature resistance, mechanical strength and chemical stability. The fire side adopts high-strength wear-resistant plastic or wear-resistant castable refractory, which can withstand high-temperature and high-speed flue gas erosion, prolonging the service life of the hearth. At the same time, their wear-resistant performance also helps to reduce the resistance of the flue gas in the hearth. The inner layer adopts insulation castable to improve the heat preservation performance of the hearth, reducing heat loss. The selection of the insulation castable should match the adiabatic material of its outer layer to ensure the overall heat preservation effect. The whole hearth adopts a support structure, which helps to maintain the stability and safety of the hearth.

[0027] The low flue gas flow rate in the hearth helps to reduce the turbulence and vortex of the flue gas in the hearth, reducing the overall resistance. At the same time, the low flow rate also helps to increase the residence time of the flue gas in the hearth, which is beneficial to the pyrolysis gasification reaction. No separate cyclone separator is arranged at the outlet of the hearth, which reduces the flue gas resistance. However, it should be noted that the absence of a cyclone separator may increase the content of solid particles in the flue gas, which puts a certain burden on the subsequent flue gas treatment equipment. The content of solid particles in the flue gas and the treatment capacity of the subsequent treatment equipment should be considered comprehensively in the design.

[0028] The material inlet of the low-resistance fluidized bed pyrolysis gasification furnace 1 is located at the lower part of the furnace, with a height distance of 2-4 m above the air distribution device of the furnace, and the feeding port is located in front of the furnace to shorten the feeding distance and improve the reliability of conveying. The higher position is beneficial to reduce the back pressure of the feeding port outlet and facilitate the feeding of the material. The material outlet pipe 4 is located at the lower part of the low-resistance fluidized bed pyrolysis gasification furnace 1, at the rear wall of the furnace, and below the air distribution device by 0-300 mm. The lower position of the discharge port is beneficial to the discharge of large particle materials. The material inlet is located at the lower part of the furnace, and the material can enter the furnace at a lower temperature area, which helps to reduce the risk of thermal shock and material coking. The feeding port is located in front of the furnace to shorten the feeding distance, reduce energy consumption and potential material blockage problems; the higher inlet position is beneficial to reduce the back pressure of the feeding port outlet, and as the material falls, its potential energy is converted into kinetic energy, which helps the material to enter the furnace more easily; the feeding port is located in front of the furnace, which not only shortens the feeding distance, but also facilitates operation and maintenance. The material outlet pipe is located at the rear wall of the furnace, and large particle materials are more easily discharged from the lower position due to gravity, reducing the residence time of the material in the furnace and the potential risk of blockage; the low position of the outlet also helps to maintain the fluidization state inside the furnace, and the fluidized bed layer near the material outlet can more effectively push the material to the outlet. The entire fluidized bed pyrolysis gasification furnace is designed as a low-resistance system, which helps to reduce energy consumption and improve the overall efficiency of the system.

[0029] The micro-positive pressure feeding device 2 utilizes a structure similar to a Venturi tube, which creates a micro-negative pressure at the feeding site, and the other parts of the micro-positive pressure feeding device 2 are micro-positive pressure.

[0030] The material outlet pipe 4 is made of heat-resistant steel within a range of 400-500 mm near the pyrolysis gasification furnace inlet section to prevent the feeding from overheating due to pressure fluctuations in the furnace, and the rest is made of carbon steel.

[0031] The low-resistance fluidized bed pyrolysis gasification furnace is provided with temperature measuring points, including the air distribution device at the lower part of the furnace, the middle part of the furnace and the outlet of the furnace. The number of temperature measuring points at the lower part of the furnace is 6-12 according to the size of the pyrolysis gasification furnace. The temperature measuring points are arranged on the air distribution device at the lower part of the furnace, which can monitor the temperature of the area above the air distribution device, and help to monitor the air preheating condition and the initial combustion state of the particles in real time. According to the size of the pyrolysis gasification furnace, usually 6-12 temperature measuring points are arranged to ensure comprehensive coverage of the area above the air distribution device. The middle part of the furnace is the main reaction area of the pyrolysis gasification process, where the fuel particles undergo intense combustion and pyrolysis reaction. The temperature measuring points can monitor the temperature of this area in real time, which helps to judge the stability and efficiency of the pyrolysis gasification process. According to the size and shape of the furnace, multiple temperature measuring points can be flexibly arranged to comprehensively reflect the temperature distribution of the middle part of the furnace. The temperature measuring points are arranged at the outlet of the furnace, which can monitor the outlet temperature of the flue gas, obtain the final temperature of the pyrolysis gasification process and the calorific value of the flue gas, and usually 1-2 temperature measuring points are arranged to accurately reflect the temperature condition at the outlet of the furnace.

[0032] The furnace pressure measuring points are arranged at the air chamber, the lower part of the furnace, the feeding port of the furnace, the middle part of the furnace and the outlet of the furnace. The air chamber is the place where the air needed for combustion is provided to the furnace. The pressure measuring points arranged at this place can monitor the air pressure entering the furnace, so as to understand the air supply condition of the air chamber, which can be used to adjust the amount of air needed for combustion and optimize the combustion process. The lower part of the furnace is the area where the fuel starts to burn. The pressure measuring points arranged at this place can monitor the pressure change in the initial combustion stage, which helps to judge whether the combustion is stable and whether the fuel or air amount needs to be adjusted. The feeding port is the channel through which the fuel enters the furnace. The pressure measuring points arranged at the feeding port can monitor the pressure change when the fuel enters the furnace, understand whether the fuel supply is stable and smooth, and help to prevent fuel blockage and optimize fuel supply. The middle part of the furnace is the area where the fuel burns most intensely. The pressure measuring points arranged at this place can monitor the pressure change in the combustion process, which helps to judge whether the combustion is sufficient and whether there are problems such as local overheating. The pressure measuring points arranged at the outlet of the furnace can monitor the pressure condition when the flue gas is discharged, which can monitor the exhaust capacity of the furnace and the resistance condition of the flue in real time, and is beneficial to prevent flue gas blockage and optimize the flue gas discharge path.

[0033] In example 2, based on the above-mentioned low-resistance fluidized bed pyrolysis gasification system with micro-positive pressure feeding, the operation process is as follows: when the system starts to work, the biomass or solid waste material passing through the micro-positive pressure feeding device 2 enters the low-resistance fluidized bed pyrolysis gasification furnace 1 through the micro-positive pressure feeding device 2 for pyrolysis gasification. The gas after gasification passes through the gas outlet pipeline 3 and is burned in the boiler. The material after pyrolysis gasification passes through the material outlet pipeline 4 and enters the storage device or is sent to the boiler for burning disposal.

[0034] The upper furnace section is large, the hot flue gas flow rate is 2.5-5 m / s, the lower section is small, and the flue gas flow rate is 3-6 m / s. The high flue gas flow rate in the lower section is used to ensure the fluidization of particles. The large upper furnace section can provide a larger combustion space and flue gas residence time, which helps the fuel to burn completely and the flue gas to mix completely, thereby improving the combustion efficiency. The large section can also reduce the flue gas flow rate and reduce the erosion and wear of the furnace wall by flue gas. The small lower furnace section can increase the flue gas flow rate, which helps to ensure the fluidization of particles and prevent particles from depositing and clogging in the lower part of the furnace. The high flue gas flow rate can also enhance the mixing effect of flue gas and fuel, thereby improving the combustion efficiency. The flue gas flow rate in the upper furnace is 2.5-5 m / s, which can ensure that the flue gas has enough residence time in the upper part of the furnace to burn the fuel completely and mix the flue gas completely. At the same time, it can also reduce the erosion and wear of the furnace wall by flue gas. The flue gas flow rate in the lower furnace is 3-6 m / s, which can ensure that the particles in the lower part of the furnace remain in a fluidized state to prevent particles from depositing and clogging. It can also enhance the mixing effect of flue gas and fuel, thereby improving the combustion efficiency.

[0035] In summary, the micro-positive pressure feeding fluidized bed pyrolysis gasification system provided by the utility model has the advantages that the low-resistance fluidized bed pyrolysis gasification furnace, the micro-positive pressure feeding device, the fuel gas outlet pipeline and the material outlet pipeline, the furnace section size of the low-resistance fluidized bed pyrolysis gasification furnace is large at the top and small at the bottom, the furnace top of the low-resistance fluidized bed pyrolysis gasification furnace is connected with the fuel gas outlet pipeline, the lower part of the furnace of the low-resistance fluidized bed pyrolysis gasification furnace is connected with the material outlet pipeline and the micro-positive pressure feeding device, the feeding problem of the pyrolysis gasification furnace is solved, the stable operation of the system is ensured, the system operation resistance is reduced, and the operation power consumption is reduced. The flue gas flow rate in the upper part of the furnace can be effectively reduced, and then the ash concentration in the upper part of the furnace is reduced, so that the feeding port pressure is reduced. The micro-positive pressure feeding device is arranged, and the separator at the flue gas outlet is removed, so that the positive pressure value required during operation can be effectively reduced. The gasification efficiency is ensured, the pressure requirement of equipment operation is reduced, and the safety and economy of operation are improved.

[0036] The above content only illustrates the technical idea of the utility model, and cannot limit the protection scope of the utility model. Any modification made on the basis of the technical scheme according to the technical idea of the utility model falls within the protection scope of the utility model claim.

Claims

1. A fluidized bed pyrolysis gasification system with micro-positive pressure feeding, characterized in that, The low-resistance fluidized bed pyrolysis gasification furnace (1), the micro-positive pressure feeding device (2), the fuel gas outlet pipeline (3) and the material outlet pipeline (4) are included; the hearth cross-sectional size of the low-resistance fluidized bed pyrolysis gasification furnace (1) is large at the top and small at the bottom, the hearth top of the low-resistance fluidized bed pyrolysis gasification furnace (1) is connected with the fuel gas outlet pipeline (3), and the hearth lower part of the low-resistance fluidized bed pyrolysis gasification furnace (1) is connected with the material outlet pipeline (4) and the micro-positive pressure feeding device (2).

2. The slightly pressurized fed fluidized bed pyrolysis gasification system according to claim 1, characterized in that, The hearth cross-sectional shape of the low-resistance fluidized bed pyrolysis gasification furnace (1) is rectangular or circular.

3. The slightly pressurized fed fluidized bed pyrolysis gasification system according to claim 1, wherein, The material outlet pipeline (4) is located within 300 mm below the air distribution device, and the micro-positive pressure feeding device (2) is located 2-4 m above the air distribution device.

4. The slightly pressurized fed fluidized bed pyrolysis gasification system according to claim 1, wherein, A section of Venturi tube is arranged on the conveying pipeline of the micro-positive pressure feeding device (2), the throat of the Venturi tube is connected with the biomass or solid waste falling pipeline, the feeding position of the micro-positive pressure feeding device (2) is micro-negative pressure, and the part of the micro-positive pressure feeding device (2) other than the feeding position is micro-positive pressure.

5. The slightly pressurized fed fluidized bed pyrolysis gasification system according to claim 1, wherein, The material outlet pipeline (4) is made of heat-resistant steel within a range of 400-500 mm close to the inlet section of the pyrolysis gasification furnace.

6. The slightly pressurized fed fluidized bed pyrolysis gasification system according to claim 1, wherein, Temperature measuring points are arranged at the air distribution device, the middle part of the hearth and the hearth outlet, and the number of temperature measuring points at the lower part of the hearth is 6-12 according to the size of the pyrolysis gasification furnace.

7. The slightly pressurized fed fluidized bed gasification pyrolysis system according to claim 1, wherein, The hearth air chamber, the hearth lower part pressure measuring point, the hearth feeding port, the middle part of the hearth and the hearth outlet are provided with pressure measuring points.

8. The slightly pressurized fed fluidized bed pyrolysis gasification system according to claim 1, wherein, The hearth adopts an adiabatic structure, the high-strength wear-resistant plastic or wear-resistant refractory castable is used on the fire side, and the inner layer adopts the heat preservation castable.

9. The slightly pressurized fed fluidized bed gasification pyrolysis system according to claim 1, wherein, During operation, the biomass or solid waste material passing through the micro-positive pressure feeding device (2) is sent into the low-resistance fluidized bed pyrolysis gasification furnace (1) through the micro-positive pressure feeding device (2) for pyrolysis gasification, the gasified fuel gas is sent to the boiler for incineration through the fuel gas outlet pipeline (3), and the pyrolysis gasified material is sent to the storage device or the boiler for incineration through the material outlet pipeline (4).

10. The slightly pressurized fed fluidized bed pyrolysis gasification system according to claim 1, wherein, The hot flue gas flow rate of the upper part of the hearth is 2.5-5 m / s, and the flue gas flow rate of the lower part of the hearth is 3-6 m / s.

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