Internal circulation biomass fluidized bed device coupling coal-fired boiler gas supply device and method

Abstract

The invention relates to the technical field of biomass fluidized beds, and discloses an internal circulation biomass fluidized bed device coupling coal-fired boiler gas supply device and method, the internal circulation biomass fluidized bed device coupling coal-fired boiler gas supply device comprises: a non-equidistant screw feeder for conveying biomass raw materials; and the output end of the non-equidistant spiral feeder is fixedly connected with the gasification furnace. According to the internal circulation biomass fluidized bed device coupling coal-fired boiler air supply device and method, the stirring device is arranged, air flows sprayed out through the oblique air spraying opening enable materials to generate rolling and fluidizing effects in a gasification furnace, the materials make more sufficient contact with the air, the reaction rate and gasification efficiency are improved, and the gasification efficiency is improved. The airflow can stir the materials, prevent the materials from accumulating or dead angles in the gasification furnace and keep the reaction environment in the gasification furnace stable, and the airflow can optimize heat transfer and material reaction and reduce energy waste, so that the efficiency and reliability of the whole system are improved.

Description

Technical Field

[0001] The invention relates to the technical field of waste disposal, and in particular to an internal circulation biomass fluidized bed device coupled with a coal-fired boiler gas supply device and method. Background Art

[0002] Agricultural and forestry wastes mainly include crop straw, fruit tree pruning branches, forestry residues, etc. These wastes are huge in quantity, and improper treatment will lead to resource waste and environmental pollution. At present, the traditional methods for treating agricultural and forestry wastes mainly include incineration, composting and direct return to the field. However, these methods have many shortcomings. For example, incineration will produce a large amount of pollutants, and composting and returning to the field have problems such as long treatment cycle and low efficiency. Therefore, it is urgent to develop efficient and environmentally friendly agricultural and forestry waste treatment technology. Fluidized bed technology, as an efficient thermochemical conversion method, provides a new way for the treatment and utilization of agricultural and forestry wastes.

[0003] The material in the fluidized bed is usually a mixture of particles of different sizes. Due to the differences in the physical properties of the particles and the effects of airflow, it is easy to cause uneven distribution and packing density of the particles in the bed. First of all, the physical properties of the particles are one of the important factors. Particles with larger particle sizes are more likely to settle at the bottom due to gravity, while smaller particles are more likely to suspend or move upward under the action of airflow, resulting in uneven distribution in the bed. In addition, the density difference of the particles can also lead to similar phenomena: particles with larger density sink faster and are more likely to concentrate at the bottom of the bed, while particles with smaller density are more likely to be distributed in the upper layer. Compared with spherical particles, irregularly shaped particles have poorer fluidization performance and are more likely to accumulate in specific areas, further exacerbating the uneven distribution. Secondly, the uneven distribution of airflow has a significant impact on the distribution of particles. If there are local high-velocity channels in the fluidized bed, the airflow will preferentially drive the movement of particles in these areas, while other areas with lower air velocities may accumulate particles. In addition, vortices or airflow short circuits may form at the wall or where the equipment structure changes. These phenomena will restrict the normal movement of particles and lead to an increase in local packing density. Uneven particle distribution or packing density will directly affect the gas-solid contact efficiency, heat transfer and chemical reaction uniformity of the fluidized bed. This problem will not only reduce equipment performance, but may also cause adverse consequences such as local overheating, incomplete reaction and material waste, which will have a negative impact on the operating efficiency and economic benefits of the equipment. Summary of the invention

[0004] Technical issues solved In view of the shortcomings of the prior art, the present invention provides an internal circulation biomass fluidized bed device coupled with a coal-fired boiler gas supply device and method, which solves the problem that the uneven distribution and stacking density of particles in the fluidized bed are caused by differences in particle characteristics and uneven airflow distribution, affecting gas-solid contact, reaction uniformity and equipment performance.

[0005] (II) Technical solution To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an internal circulation biomass fluidized bed device coupled with a coal-fired boiler gas supply device, comprising: a non-equidistant spiral feeder for conveying biomass raw materials; a gasifier, wherein the output end of the non-equidistant spiral feeder is fixedly connected to the gasifier, and is used to complete the drying, distillation, reduction, oxidation, and tar cracking and fixed carbon hydration reactions of the biomass to generate gasification synthesis gas; a conveying pipeline, wherein the top of the gasifier is fixedly connected to one end of the conveying pipeline, and is used to convey the gasification synthesis gas generated by the gasifier; a heat exchanger, wherein the heat exchanger is fixedly connected to the conveying pipeline, and the front end of the heat exchanger is connected to the conveying pipeline. A high-temperature fan is connected to the rear end of the device for heat exchange with the gasification synthesis gas, so as to improve the gas transportation efficiency and protect the subsequent equipment; a high-temperature fan, the other end of the transportation pipeline is fixedly connected with a high-temperature fan for guiding the gasification synthesis gas; a flame arrester, the output end of the high-temperature fan is fixedly connected with a flame arrester, which is used to prevent the flame in the coal-fired boiler from flowing back to the gasifier to ensure the safety of the system; a coal-fired boiler, the outer wall of the flame arrester is fixedly connected with a coal-fired boiler for burning the gasification synthesis gas; a stirring device, the gasifier is provided with a stirring device for stirring the material at the bottom of the gasifier; a slag discharge mechanism, the gasifier is provided with a slag discharge mechanism for removing the ash at the bottom of the gasifier.

[0006] Preferably, the non-equidistant spiral feeder includes a feeding frame, a biomass silo is arranged on the top of the feeding frame, a driving motor is fixedly connected to the bottom of the feeding frame, the output shaft of the driving motor is fixedly connected to the feeding shaft, and the outer wall of the feeding shaft is fixedly connected to non-equidistant spiral blades.

[0007] Preferably, the feeding frame is arranged at an angle, and a support frame is arranged on the surface of the feeding frame.

[0008] Preferably, the stirring device includes a blower, the output end of the blower is fixedly connected to one end of an air supply pipe, the other end of the air supply pipe is fixedly connected to a hollow ring, the top of the hollow ring is rotatably connected to a hollow column, the outer wall of the hollow column is fixedly connected to a gear, the top of the hollow column is fixedly connected to a hollow square block, the top of the hollow square block is fixedly connected to an oblique jet port, the bottom of the inner wall of the gasifier is rotatably connected to a bottom inner gear ring, the top of the bottom inner gear ring is fixedly connected to a side cleaning piece, and the top of the side cleaning piece is fixedly connected to a top ring.

[0009] Preferably, the inner wall of the air supply pipe is communicated with the inner wall of the hollow ring, and the oblique air jet is arranged obliquely.

[0010] Preferably, the inner wall of the bottom inner gear ring is meshed with the gear, and the outer wall of the top ring is rotatably connected to the inner wall of the gasifier.

[0011] Preferably, the residue discharge mechanism includes a bottom channel, the bottom channel is fixedly connected to the bottom of the gasifier, the bottom of the hollow ring is fixedly connected to one end of a bottom air supply pipe, the other end of the bottom air supply pipe is fixedly connected to an annular groove part, the inner wall of the bottom channel is fixedly connected to a grate, a middle through groove is provided in the middle of the annular groove part, a circular ring part is rotatably connected to the inner wall of the annular groove part, and an arc-shaped sheet is fixedly connected to the outer wall of the circular ring part.

[0012] Preferably, the outer wall of the bottom air supply pipe is fixedly connected to the inner wall of the bottom channel for supporting and fixing the bottom air supply pipe, and the inner wall of the hollow ring is fixedly connected to the outer wall of the bottom channel.

[0013] Preferably, a slag outlet is provided in the middle of the grate for discharging ash produced after the reaction out of the gasifier, and ventilation holes are provided on the inner wall of the grate for uniformly introducing air or other gases.

[0014] A method for using an internal circulation biomass fluidized bed device coupled with a coal-fired boiler gas supply device, further comprising the following steps: Step 1: Ensure that there is sufficient raw material in the biomass silo. The raw material in the silo must meet the specified moisture and particle requirements. Check the connection of each component of the device to ensure that the non-equidistant screw feeder, gasifier, conveying pipeline, etc. are connected normally. Before starting the equipment, ensure that the driving motor, blower, high-temperature blower, heat exchanger, and residue discharge mechanism are functioning normally; Step 2: Start the non-equidistant screw feeder, and the driving motor drives the feed shaft to rotate, so as to uniformly and continuously transport the biomass raw materials from the biomass silo to the gasifier through the feed frame, and the biomass is dried, distilled, reduced, oxidized and other reactions are carried out in the gasifier, and tar cracking and fixed carbonization reactions are completed at the same time to generate gasification synthesis gas; Step three, turn on the stirring device, start the blower, send air into the hollow ring through the air supply pipe, then enter the hollow square block through the hollow column, and then spray out through the oblique jet port. The oblique jet port generates an oblique reaction force, causing the hollow square block to rotate, and the hollow square block drives the hollow column and the gear to rotate. Step 4: The air in the hollow ring is input into the annular groove through the bottom air supply pipe, and the arc-shaped pieces in the annular groove are impacted, so that the airflow in the annular groove evenly impacts the ventilation holes of the grate upwards; Step 5: The gasified syngas is transported to the heat exchanger through a transport pipeline. The gasified syngas after heat exchange is transported by a high-temperature fan and enters the coal-fired boiler through a flame arrester. The gasified syngas is burned in the coal-fired boiler.

[0015] (III) Beneficial effects Compared with the prior art, the present invention provides an internal circulation biomass fluidized bed device coupled with a coal-fired boiler gas supply device and method, which has the following beneficial effects: 1. The internal circulation biomass fluidized bed device is coupled with a coal-fired boiler gas supply device and method, and a stirring device is used to set up the air. The airflow ejected from the oblique jet port can make the material tumble and fluidize in the gasifier, so that the material is in contact with the air more fully, and the reaction rate and gasification efficiency are improved. The airflow can stir the material to prevent the material from piling up or dead corners in the gasifier, and keep the reaction environment in the gasifier stable. The airflow can optimize heat transfer and material reaction, reduce energy waste, and thus improve the efficiency and reliability of the entire system.

[0016] 2. The internal circulation biomass fluidized bed device is coupled with a coal-fired boiler gas supply device and method, and utilizes a non-equidistant spiral feeder to uniformly and continuously transport the biomass raw materials from the silo to the gasifier. The spacing of the non-equidistant spiral blades gradually changes, making the space between the spiral blades uneven. When the spiral blades rotate to transport the material, combined with the sealing effect of the spiral propulsion, the gas in the gasifier can be effectively prevented from flowing back to the biomass silo through the feed frame, thereby ensuring the airtightness and safety of the system. If the moisture content of the material in the biomass silo is high, the inclined setting can prolong the residence time of the material during the transportation process, which helps to pre-dry the material using the hot air escaping from the gasifier, thereby improving the gasification efficiency.

[0017] 3. The internal circulation biomass fluidized bed device is coupled with a coal-fired boiler gas supply device and method. The stirring device is set up and the oblique jet port rotates to jet. The material can be evenly stirred and turned, which helps to avoid local accumulation of materials in the gasifier and improve the contact efficiency between the material and the airflow. The rotation can dynamically change the jet angle of the oblique jet port, making the airflow direction more flexible, optimizing the distribution of gas in the gasifier, and adapting to the needs under different operating conditions. This design achieves a self-cleaning effect through rotational motion, reduces the possibility of material adhesion to the gasifier, extends the service life of the equipment, and reduces maintenance and cleaning costs.

[0018] 4. The internal circulation biomass fluidized bed device is coupled with a coal-fired boiler gas supply device and method, and utilizes a residue discharge mechanism to evenly deliver air to the ventilation holes of the grate, thereby ensuring uniform gas flow in the furnace, thereby improving the stability and efficiency of the reaction in the furnace. Uniform airflow distribution is conducive to the full mixing of fuel and air, improving the heat exchange efficiency during combustion or gasification, and reducing incompletely reacted materials. In addition, the uniform distribution of airflow avoids excessive or weak local airflow through the ventilation holes of the grate, reduces the accumulation of dust or materials at the ventilation holes, thereby keeping the equipment in the furnace clean and unobstructed. The uniform airflow upwardly impacting the grate also helps to improve the thermal convection effect in the furnace, promotes heat transfer, and thereby improves the overall thermal efficiency of the equipment. The adjustment and uniform distribution of the airflow by the arc-shaped sheet can also effectively avoid unstable combustion or incomplete reactions in the gasification process caused by uneven airflow or wind speed fluctuations, thereby ensuring that the combustion or gasification process is more stable and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of an internal circulation biomass fluidized bed device coupled with a coal-fired boiler gas supply device and method proposed by the present invention; Figure 2 It is a cross-sectional structural schematic diagram of a feeding frame of an internal circulation biomass fluidized bed device coupled with a coal-fired boiler gas supply device and method proposed by the present invention; Figure 3 A schematic cross-sectional structure diagram of a gasifier of an internal circulation biomass fluidized bed device coupled with a coal-fired boiler gas supply device and method proposed by the present invention; Figure 4 A schematic cross-sectional structure diagram of a hollow ring member in an internal circulation biomass fluidized bed device coupled to a coal-fired boiler gas supply device and method proposed by the present invention; Figure 5 This is a schematic cross-sectional structure diagram of a hollow square block in an internal circulation biomass fluidized bed device coupled with a coal-fired boiler gas supply device and method proposed by the present invention; Figure 6 This is a schematic structural diagram of the inner gear ring at the bottom of an internal circulation biomass fluidized bed device coupled with a coal-fired boiler gas supply device and method proposed by the present invention; Figure 7 A schematic diagram of a partial cross-sectional structure of a bottom channel of an internal circulation biomass fluidized bed device coupled with a coal-fired boiler gas supply device and method proposed by the present invention; Figure 8 This is a structural schematic diagram of an arc-shaped sheet of an internal circulation biomass fluidized bed device coupled with a coal-fired boiler gas supply device and method proposed by the present invention.

[0020] In the figure: 1, non-equidistant spiral feeder; 11, feeding frame; 12, biomass silo; 13, driving motor; 14, feeding shaft; 15, non-equidistant spiral blades; 2, gasifier; 3, conveying pipeline; 4, heat exchanger; 5, high-temperature fan; 6, flame arrester; 7, coal-fired boiler; 8, stirring device; 81, blower; 82, air supply pipe; 83, hollow ring; 84, hollow column; 85, gear; 86, hollow square block; 87, oblique jet nozzle; 88, bottom inner gear ring; 89, side cleaning part; 810, top ring; 9, residue discharge mechanism; 91, bottom channel; 92, bottom air supply pipe; 93, grate; 94, ring-shaped groove part; 95, middle through groove; 96, circular ring part; 97, arc-shaped piece. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] See also Figure 1-Figure 8 , an internal circulation biomass fluidized bed device coupled with a coal-fired boiler gas supply device, comprising: a non-equidistant spiral feeder 1, used to transport biomass raw materials, ensure uniform and continuous feeding, and prevent air from entering the system; a gasifier 2, the output end of the non-equidistant spiral feeder 1 is fixedly connected to the gasifier 2, used to complete the drying, distillation, reduction, oxidation, tar cracking and fixed carbon hydration reactions of the biomass to generate gasification synthesis gas; a conveying pipeline 3, one end of the conveying pipeline 3 is fixedly connected to the top of the gasifier 2, used to transport the gasification synthesis gas generated by the gasifier 2; a heat exchanger 4, the heat exchanger 4 is fixedly connected to the conveying pipeline 3, the front end of the heat exchanger 4 is connected to the conveying pipeline 3, and the rear end of the heat exchanger 4 is connected to a high-temperature fan 5, used to exchange heat with the gasification synthesis gas, improve the gas transportation efficiency and protect subsequent equipment ; High-temperature fan 5, the other end of the conveying pipeline 3 is fixedly connected with a high-temperature fan 5, which is used to guide the gasification synthesis gas and provide power to transport it to the coal-fired boiler 7 for incineration and power generation; flame arrester 6, the output end of the high-temperature fan 5 is fixedly connected with a flame arrester 6, which is used to prevent the flame in the coal-fired boiler 7 from flowing back to the gasifier 2 to ensure the safety of the system; coal-fired boiler 7, the outer wall of the flame arrester 6 is fixedly connected with the coal-fired boiler 7, which is used to burn the gasification synthesis gas to provide heat energy for power generation, reduce coal use and pollutant emissions; stirring device 8, the gasifier 2 is provided with a stirring device 8, which is used to stir the material at the bottom of the gasifier 2 to prevent accumulation and enhance internal circulation, and at the same time, send air through the ventilation holes to promote the reaction; slag discharge mechanism 9, the gasifier 2 is provided with a slag discharge mechanism 9, which is used to remove the ash at the bottom of the gasifier 2 to keep the system running smoothly.

[0023] The non-equidistant spiral feeder 1 includes a feeding frame 11, a biomass silo 12 is arranged on the top of the feeding frame 11, and the biomass silo 12 is used to temporarily store the biomass raw materials to be gasified, so as to ensure that the system has sufficient material supply during operation, and to avoid affecting the continuity of the gasification process due to interruption of raw material supply. A driving motor 13 is fixedly connected to the bottom of the feeding frame 11, and a feeding shaft 14 is fixedly connected to the output shaft of the driving motor 13. The outer wall of the feeding shaft 14 is fixedly connected to a non-equidistant spiral sheet 15. The driving motor 13 drives the feeding shaft 14 to rotate through the output shaft, thereby driving the non-equidistant spiral sheet 15 operates to uniformly and continuously transport the biomass raw materials from the silo to the gasifier 2. The spacing of the non-equidistant spiral blades 15 changes gradually, making the space between the spiral blades uneven. When the spiral blades rotate to transport the material, the gas will be affected by the pressure gradient in the material transport direction, and it is difficult to directly flow back to the silo. The design of the non-equidistant spiral blades 15 allows the material to form a dense layer during the transportation process, filling the gaps between the spiral blades, further blocking the backflow of the gas. Compared with the equidistant structure, the non-equidistant structure can more effectively compress the material, thereby improving the sealing effect. Through these characteristics, the non-equidistant structure The equidistant spiral blades 15 provide a dynamic sealing function while conveying the material, which not only ensures the isolation of the gasifier 2 from the outside world, but also improves the safety and operation efficiency of the system. The feed frame 11 is tilted. This tilting method gradually conveys the material from the low-position feed port to the high-position discharge port through the rotation of the non-equidistant spiral blades 15, effectively realizing the material lifting function, and is suitable for occasions where gravity cannot directly complete the conveying. The feed port is located at a low position, combined with the sealing effect of the spiral propulsion, which can effectively prevent the gas in the gasifier 2 from flowing back to the biomass silo 12 through the feed frame 11, ensuring System airtightness and safety: if the moisture content of the material in the biomass silo 12 is high, the inclined setting can prolong the residence time of the material during transportation, help to use the hot air escaping from the gasifier 2 to pre-dry the material, and improve the gasification efficiency. A support frame is provided on the surface of the feed frame 11, and the support frame provides a stable support structure for the feed frame 11 to ensure that it can be firmly installed in the equipment system to avoid position displacement or loosening due to vibration or external force. During the operation of the system, the movement of the motor will generate vibration, and the support frame helps to disperse these forces and reduce the impact of vibration on the overall device.

[0024] The stirring device 8 includes a blower 81, the output end of the blower 81 is fixedly connected to one end of an air supply pipe 82, the other end of the air supply pipe 82 is fixedly connected to a hollow ring member 83, the top of the hollow ring member 83 is rotatably connected to a hollow column 84, the outer wall of the hollow column 84 is fixedly connected to a gear 85, the top of the hollow column 84 is fixedly connected to a hollow square block 86, the top of the hollow square block 86 is fixedly connected to an oblique air jet 87, the bottom of the inner wall of the gasifier 2 is rotatably connected to a bottom inner gear ring 88, the top of the bottom inner gear ring 88 is fixedly connected to a side cleaning member 89, the top of the side cleaning member 89 is fixedly connected to a top ring 810, the inner wall of the air supply pipe 82 is connected to the inner wall of the hollow ring member 83, the oblique air jet 87 is inclined, and can form a circumferential rotational force when jetting, and can make the gas and material rotate through the circumferential rotation. Full contact improves the gas-solid mixing effect, thereby improving the efficiency of the gasification reaction. The inner wall of the bottom inner gear ring 88 is meshed with the gear 85, and the outer wall of the top ring 810 is rotatably connected to the inner wall of the gasifier 2. The top ring 810 is rotatably connected to the inner wall of the gasifier 2 to provide support for the side cleaning member 89 to ensure that the side cleaning member 89 remains stable during rotation. At the same time, the rotational motion can effectively clean the attachments on the inner wall of the gasifier 2 to maintain the clean state in the furnace, which can reduce the interference of the attachments on the airflow distribution and avoid local gas velocity changes due to the accumulation of attachments, thereby improving the uniform distribution and stacking density of the particles. For the problem of uneven particle distribution and stacking density in the fluidized bed, this cleaning effect helps to optimize the gas-solid contact, improve the uniformity of the reaction and equipment performance, and reduce the reaction efficiency reduction or equipment operation problems caused by local particle accumulation.

[0025] The residue discharge mechanism 9 includes a bottom channel 91, which is fixedly connected to the bottom of the gasifier 2. The bottom of the hollow ring 83 is fixedly connected to one end of a bottom air supply pipe 92, and the other end of the bottom air supply pipe 92 is fixedly connected to an annular groove 94. The inner wall of the bottom channel 91 is fixedly connected to a furnace grate 93. The middle of the annular groove 94 is provided with a middle through groove 95. The inner wall of the annular groove 94 is rotatably connected to a circular ring 96, and the outer wall of the circular ring 96 is fixedly connected to The arc-shaped sheet 97 is designed as an arc-shaped sheet. When the wind from the bottom air supply pipe 92 blows into the annular groove 94, the arc-shaped sheet 97 in the annular groove 94 is blown to rotate. At this time, the air is blown upward to the ventilation holes of the grate 93 through the annular groove 94. This rotation produces a uniform airflow distribution. The airflow is blown upward into the fluidized bed through the ventilation holes of the grate 93. This airflow can effectively disturb the bed particles, improve the fluidization state of the particles, and alleviate the differences in particle characteristics and airflow. The problem of uneven particle distribution and stacking density caused by uneven distribution can be solved by uniform airflow, which can enhance gas-solid contact and promote reaction uniformity, while preventing excessive accumulation or insufficient reaction of particles in certain areas. This not only improves the gasification reaction efficiency, but also improves the equipment performance and operation stability. The outer wall of the bottom air supply pipe 92 is fixedly connected to the inner wall of the bottom channel 91, which is used to support and fix the bottom air supply pipe 92. The inner wall of the hollow ring 83 is fixedly connected to the outer wall of the bottom channel 91. A slag outlet is provided in the middle of the grate 93 to discharge the ash produced after the reaction out of the gasifier 2 to avoid ash accumulation affecting the fluidization of the material and the progress of the gasification reaction. Ventilation holes are provided on the inner wall of the grate 93 to evenly introduce air or other gases, improve airflow distribution, ensure sufficient fluidization of the bed material and promote the efficiency of the gasification reaction. This design takes into account the functions of slag discharge and ventilation, which helps to maintain stable operation and efficient reaction conditions in the gasifier 2.

[0026] A method for using an internal circulation biomass fluidized bed device coupled with a coal-fired boiler gas supply device, further comprising the following steps: Step 1: Ensure that there is sufficient raw material in the biomass silo 12. The raw material in the silo must meet the specified moisture and particle requirements. Check the connection of each component of the device to ensure that the non-equidistant screw feeder 1, gasifier 2, conveying pipeline 3, etc. are normally connected. Before starting the equipment, ensure that the driving motor 13, blower 81, high-temperature blower 5, heat exchanger 4, and residue discharge mechanism 9 are functioning normally; Step 2: Start the non-equidistant screw feeder 1, and the driving motor 13 drives the feed shaft 14 to rotate, so as to uniformly and continuously transport the biomass raw material from the biomass silo 12 to the gasifier 2 through the feed frame 11, and the biomass is dried, distilled, reduced, oxidized and other reactions are carried out in the gasifier 2, and tar cracking and fixed carbonization reactions are completed at the same time to generate gasification synthesis gas; Step 3, turn on the stirring device 8, start the blower 81, send air into the hollow ring 83 through the air supply pipe 82, then enter the hollow square block 86 through the hollow column 84, and then spray out through the oblique jet port 87. The airflow sprayed from the oblique jet port 87 can make the material produce a tumbling and fluidization effect in the gasifier 2, so that the material and the air are in contact more fully, and the reaction rate and gasification efficiency are improved. The airflow can stir the material to prevent the material from being piled up or dead in the gasifier 2, and keep the reaction environment in the gasifier 2 stable. The airflow can optimize heat transfer and material reaction, reduce energy waste, and thus improve the efficiency and reliability of the entire system. 87 generates an oblique reaction force, so that the hollow square block 86 rotates, and the hollow square block 86 drives the hollow column 84 and the gear 85 to rotate. Through the rotation of the hollow column 84 and the gear 85, the material can be evenly stirred and turned, which helps to avoid local accumulation of materials in the gasifier 2 and improve the contact efficiency between the material and the airflow. The rotation can dynamically change the jet angle of the oblique jet port 87, making the airflow direction more flexible, optimizing the distribution of gas in the gasifier 2, and adapting to the needs under different operating conditions. This design achieves a self-cleaning effect through rotational motion, reduces the possibility of material adhering to the gasifier 2, extends the service life of the equipment, and reduces maintenance and cleaning costs. Step 4: The air in the hollow ring 83 is input into the annular groove 94 through the bottom air supply pipe 92. The arc-shaped sheet 97 in the annular groove 94 is impacted, so that the airflow in the annular groove 94 evenly impacts the ventilation holes of the grate 93 upward. This process can effectively and evenly transport the air to the ventilation holes of the grate 93, ensuring that the gas flow in the furnace is uniform, thereby improving the stability and efficiency of the reaction in the furnace. The uniform airflow distribution is conducive to the full mixing of fuel and air, improving the heat exchange efficiency in the combustion or gasification process, and reducing the material that is not fully reacted. In addition, The uniform distribution of airflow through the ventilation holes of the grate 93 avoids excessive or weak local airflow, reduces the accumulation of dust or materials at the ventilation holes, and thus keeps the equipment in the furnace clean and unobstructed. The uniform airflow upwardly impacting the grate 93 also helps to improve the heat convection effect in the furnace, promotes heat transfer, and thus improves the overall thermal efficiency of the equipment. The adjustment and uniform distribution of the airflow by the arc-shaped sheet 97 can also effectively avoid unstable combustion or incomplete reaction in the gasification process caused by uneven airflow or wind speed fluctuations, ensuring that the combustion or gasification process is more stable and efficient. In step five, the gasified syngas is transported to the heat exchanger 4 through the transport pipeline 3 for heat exchange to improve the gas transport efficiency and protect the subsequent equipment. The gasified syngas after heat exchange is transported by the high-temperature fan 5 and enters the coal-fired boiler 7 through the flame arrester 6. The gasified syngas is burned in the coal-fired boiler 7, and the generated heat energy is used for power generation, thereby reducing the use of coal and pollutant emissions.

[0027] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. An internal circulation biomass fluidized bed device coupled with a coal-fired boiler gas supply device, characterized in that: include: A non-equidistant screw feeder (1) is used to transport biomass raw materials; A gasifier (2), wherein the output end of the non-equidistant spiral feeder (1) is fixedly connected to the gasifier (2), and is used to complete the drying, carbonization, reduction, oxidation, tar cracking and fixed carbonization reactions of biomass to generate gasification synthesis gas; A conveying pipeline (3), one end of which is fixedly connected to the top of the gasifier (2) and is used to convey the gasified synthesis gas generated by the gasifier (2); A heat exchanger (4), the heat exchanger (4) being fixedly connected to the delivery pipeline (3), the front end of the heat exchanger (4) being connected to the delivery pipeline (3), and the rear end of the heat exchanger (4) being connected to a high-temperature fan (5), for performing heat exchange on the gasified synthesis gas, thereby improving the gas delivery efficiency and protecting subsequent equipment; A high-temperature fan (5), the other end of the delivery pipeline (3) being fixedly connected to the high-temperature fan (5) for introducing and delivering the gasified synthesis gas; A flame arrester (6), wherein the output end of the high-temperature fan (5) is fixedly connected to the flame arrester (6), which is used to prevent the flame in the coal-fired boiler (7) from flowing back to the gasifier (2) to ensure system safety; A coal-fired boiler (7), the outer wall of the flame arrester (6) being fixedly connected to the coal-fired boiler (7) for burning gasified synthesis gas; A stirring device (8), wherein the gasifier (2) is provided with a stirring device (8) for stirring materials at the bottom of the gasifier (2); A residue discharge mechanism (9), wherein the gasifier (2) is provided with a residue discharge mechanism (9) for removing ash and slag at the bottom of the gasifier (2).

2. The internal circulation biomass fluidized bed device coupled with a coal-fired boiler gas supply device according to claim 1, characterized in that: The non-equidistant spiral feeder (1) comprises a feeding frame (11), a biomass silo (12) is arranged on the top of the feeding frame (11), a driving motor (13) is fixedly connected to the bottom of the feeding frame (11), an output shaft of the driving motor (13) is fixedly connected to a feeding shaft (14), and the outer wall of the feeding shaft (14) is fixedly connected to non-equidistant spiral plates (15).

3. The internal circulation biomass fluidized bed device coupled with a coal-fired boiler gas supply device according to claim 2, characterized in that: The feeding frame (11) is arranged to be inclined, and a support frame is arranged on the surface of the feeding frame (11).

4. The internal circulation biomass fluidized bed device coupled with a coal-fired boiler gas supply device according to claim 2, characterized in that: The stirring device (8) comprises an air blower (81), the output end of the air blower (81) is fixedly connected to one end of an air supply pipe (82), the other end of the air supply pipe (82) is fixedly connected to a hollow ring member (83), the top of the hollow ring member (83) is rotatably connected to a hollow column (84), the outer wall of the hollow column (84) is fixedly connected to a gear (85), the top of the hollow column (84) is fixedly connected to a hollow square block (86), the top of the hollow square block (86) is fixedly connected to an oblique air jet (87), the bottom of the inner wall of the gasifier (2) is rotatably connected to a bottom inner gear ring (88), the top of the bottom inner gear ring (88) is fixedly connected to a side cleaning member (89), and the top of the side cleaning member (89) is fixedly connected to a top ring (810).

5. The internal circulation biomass fluidized bed device coupled with a coal-fired boiler gas supply device according to claim 4, characterized in that: The inner wall of the air supply pipe (82) is in communication with the inner wall of the hollow ring (83), and the oblique air jet port (87) is arranged obliquely.

6. The internal circulation biomass fluidized bed device coupled with a coal-fired boiler gas supply device according to claim 4, characterized in that: The inner wall of the bottom inner gear ring (88) is meshed with the gear (85), and the outer wall of the top ring (810) is rotatably connected to the inner wall of the gasifier (2).

7. The internal circulation biomass fluidized bed device coupled with a coal-fired boiler gas supply device according to claim 4, characterized in that: The residue discharge mechanism (9) comprises a bottom channel (91), the bottom channel (91) is fixedly connected to the bottom of the gasifier (2), one end of a bottom air supply pipe (92) is fixedly connected to the bottom of the hollow ring member (83), the other end of the bottom air supply pipe (92) is fixedly connected to an annular groove member (94), the inner wall of the bottom channel (91) is fixedly connected to a furnace grate (93), a middle through groove (95) is provided in the middle of the annular groove member (94), a circular ring member (96) is rotatably connected to the inner wall of the circular groove member (94), and an arc-shaped sheet (97) is fixedly connected to the outer wall of the circular ring member (96).

8. The internal circulation biomass fluidized bed device coupled with a coal-fired boiler gas supply device according to claim 7, characterized in that: The outer wall of the bottom air supply pipe (92) is fixedly connected to the inner wall of the bottom channel (91) and is used to support and fix the bottom air supply pipe (92); the inner wall of the hollow ring (83) is fixedly connected to the outer wall of the bottom channel (91).

9. The internal circulation biomass fluidized bed device coupled with a coal-fired boiler gas supply device according to claim 7, characterized in that: A slag outlet is provided in the middle of the grate (93) for discharging ash produced after the reaction out of the gasifier (2); ventilation holes are provided on the inner wall of the grate (93) for uniformly introducing air or other gases.

10. A method for using an internal circulation biomass fluidized bed device coupled with a coal-fired boiler gas supply device, characterized in that: The internal circulation biomass fluidized bed device coupled with a coal-fired boiler gas supply device as described in any one of claims 1 to 9 above also includes the following use steps: Step 1: Ensure that there is sufficient raw material in the biomass silo (12). The raw material in the silo must meet the specified moisture and particle requirements. Check the connection of the various components of the device to ensure that the non-equidistant screw feeder (1), the gasifier (2), the conveying pipeline (3), etc. are properly connected. Before starting the equipment, ensure that the driving motor (13), the air blower (81), the high-temperature fan (5), the heat exchanger (4), the residue discharge mechanism (9), etc. are functioning properly. Step 2: starting the non-equidistant screw feeder (1), and driving the feed shaft (14) to rotate by the driving motor (13), so as to uniformly and continuously transport the biomass raw material from the biomass silo (12) through the feed frame (11) to the gasifier (2), wherein the biomass is dried, distilled, reduced, oxidized, etc., and tar cracking and fixed carbonization reactions are completed in the gasifier (2), thereby generating gasification synthesis gas; Step 3, the stirring device (8) is turned on, the air supply fan (81) is started, and air is sent into the hollow ring (83) through the air supply pipe (82), and then enters the hollow square block (86) through the hollow column (84), and then ejected through the oblique air jet (87). The oblique air jet (87) generates an oblique reaction force, causing the hollow square block (86) to rotate, and the hollow square block (86) drives the hollow column (84) and the gear (85) to rotate. Step 4: the air in the hollow ring member (83) is input into the annular groove member (94) through the bottom air supply pipe (92), and the arc-shaped sheet (97) in the annular groove member (94) is impacted, so that the airflow in the annular groove member (94) evenly impacts the ventilation holes of the grate (93) upwards; In step five, the gasified synthesis gas is transported to the heat exchanger (4) via the transport pipeline (3). The gasified synthesis gas after heat exchange is transported by the high-temperature fan (5) and enters the coal-fired boiler (7) through the flame arrester (6). The gasified synthesis gas is burned in the coal-fired boiler (7).

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