A circulating fluidized bed gasification device

Abstract

This utility model relates to the field of gasification technology for municipal solid waste that has undergone shallow carbonization and crushing, and particularly to a circulating fluidized bed gasification device. The device includes a pyrolysis gasification unit, a high-temperature gasification chamber, and a cyclone separator. The bottom of the pyrolysis gasification unit has a first gasifying agent inlet, and the side wall has a coarse particle material inlet and a second gasifying agent inlet. The upper part of the high-temperature gasification chamber is connected to the pyrolysis gasification unit to feed the first volatile matter generated by the pyrolysis of coarse particles in the pyrolysis gasification unit into the high-temperature gasification chamber. The bottom of the high-temperature gasification chamber has a first gasifying agent inlet and a second gasifying agent inlet, and the side wall has a fine particle material inlet. The upper part of the high-temperature gasification chamber is connected to the upper part of the cyclone separator to feed the second volatile matter generated by gasification in the high-temperature gasification chamber into the cyclone separator. The gasification device provided by this utility model can effectively reduce tar content, reduce fly ash content, maintain stable operation, and improve gasification intensity and syngas quality.

Description

Technical Field

[0001] This utility model relates to the field of gasification technology for municipal solid waste that has been lightly carbonized and crushed, and particularly to a circulating fluidized bed gasification device. Background Technology

[0002] With continuous urbanization, the amount of urban domestic waste generated is increasing daily. Statistics show that in 2024, the national urban domestic waste collection volume reached approximately 262.3662 million tons, a staggering figure. How to handle this massive amount of urban domestic waste has become a significant environmental issue. Traditional urban waste treatment technologies mainly include sanitary landfill, biocomposting, and incineration. While these technologies can solve the waste disposal problem to some extent, they all have drawbacks. For example, sanitary landfills face difficulties in site selection, occupy large amounts of land resources, and generate leachate and biogas, causing secondary pollution to the natural environment. Biocomposting technology requires a long cycle and has low energy utilization efficiency; furthermore, this technology is more suitable for waste with high organic matter content, low toxicity, and easy degradation. Incineration, while effectively reducing volume and quantity, has relatively low efficiency in terms of energy utilization and recovery, and the dioxins and greenhouse gases produced by incineration have a serious negative impact on the environment. Traditional waste treatment technologies cannot meet the current demand for the harmless treatment of massive amounts of domestic waste, making the development of new and thoroughly harmless domestic waste treatment technologies imperative.

[0003] In recent years, gasification technology has become an effective method for treating municipal solid waste. Gasification is generally more efficient at processing waste and has a much smaller environmental impact. Gasification technology has relatively broad requirements for raw materials, promotes a circular economy, and, more importantly, can produce high-value-added products such as syngas and alkanes. Currently, gasification technologies that are commercially applicable or have commercial operation qualifications include fixed-bed gasification technology, high-temperature gasification melting technology, plasma gasification technology, and fluidized-bed gasification technology. Fixed-bed gasification technology is the most mature and was initially applied to coal gasification. Its advantages include suitability for lumpy and large-particle raw materials. While fixed-bed reactors have a simple design, they suffer from uneven temperature distribution and difficult process control. Furthermore, they produce large amounts of tar, grease, benzene, ammonia, and other substances, making subsequent separation and purification challenging. High-temperature gasification and melting technology for municipal solid waste first pyrolyzes the waste to generate combustible gas, which is then fed into a high-temperature gasifier for further conversion and melting at over 1200°C. Organic components are completely decomposed into syngas under a reducing atmosphere. This technology consumes a large amount of energy, easily accelerates equipment wear, and requires frequent maintenance. High cost; Plasma gasification has proven to be one of the most efficient and environmentally friendly solid waste treatment methods. Plasma gasification technology converts waste into usable energy, reduces slag volume, avoids the generation of toxic organic matter, fixes heavy metals in inert slag, and simultaneously generates syngas, which can be used for energy and heat recovery systems and power generation. Although plasma gasification has high temperature and high thermal density, it consumes a huge amount of energy and has a small processing scale, making it more suitable for treating hazardous waste. Fluidized bed gasification technology can achieve full contact between gas and solid during the reaction process, increasing the contact area by more than 5 times compared to fixed beds. The output per furnace is significantly higher than that of fixed beds, meeting the needs of large-scale continuous production. The particles are thoroughly mixed within the reactor, resulting in uniform bed temperature and concentration, high heat transfer efficiency, and high gasification intensity, making it suitable for large-scale industrial gas supply systems. Currently, fluidized bed gasifiers (especially circulating fluidized bed gasifiers) are widely used due to their large-scale production capacity, feedstock adaptability, and mature engineering experience. However, a series of key issues still exist in actual operation. For example, the gas produced by fluidized bed gasification has a high tar content and a large fly ash content, increasing the difficulty of subsequent purification treatment; fluidized bed gasification technology has high requirements for fuel distribution and temperature uniformity within the bed, and the operation control and detection methods are relatively complex; particle size differences can lead to a chain reaction of fluidization disruption, product quality decline, and reduced operating efficiency; and incomplete carbon combustion during fluidized bed gasification results in a high content of unburned carbon in the product gas. Utility Model Content

[0004] To address the problem of incomplete carbon combustion caused by differences in the particle size of materials entering the fluidized bed gasifier in the prior art, this invention provides a circulating fluidized bed gasification device.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0006] A circulating fluidized bed gasification device is suitable for municipal solid waste materials that have undergone shallow carbonization and crushing, including a pyrolysis gasification device, a high-temperature gasification chamber, and a cyclone separator;

[0007] The bottom of the pyrolysis gasification device is provided with a first gasifying agent inlet, and the side wall is provided with a coarse particle material inlet and a second gasifying agent inlet; the upper part of the high-temperature gasification chamber is connected to the pyrolysis gasification device to send the first volatiles generated by the pyrolysis of coarse particles in the pyrolysis gasification device into the high-temperature gasification chamber; the bottom of the high-temperature gasification chamber is provided with a first gasifying agent inlet and a second gasifying agent inlet, and the side wall is provided with a fine particle material inlet; the upper part of the high-temperature gasification chamber is connected to the upper part of the cyclone separator to send the second volatiles generated by gasification in the high-temperature gasification chamber into the cyclone separator.

[0008] In one embodiment of this utility model, the pyrolysis gasification device includes a heating section and a conical section arranged along the direction of gravity.

[0009] In one embodiment of the present invention, a first grid plate is further included, which is disposed inside the transition connection between the heating section and the conical section to allow gas to pass through and to catch particulate matter.

[0010] In one embodiment of the present invention, a second grid plate is further included, which is disposed above the first gasifying agent inlet and / or the second gasifying agent inlet of the high-temperature gasification chamber to allow gas to pass through and to catch particulate matter.

[0011] In one embodiment of the present invention, the first grid plate includes a plurality of first grid holes, and the second grid plate includes a plurality of second grid holes, wherein the diameter of the second grid holes is smaller than the diameter of the first grid holes.

[0012] In one embodiment of this utility model, a feeding device is further included, which consists of a coarse particle feeding component and a fine particle feeding component; the coarse particle feeding device is connected to the coarse particle material inlet, and the fine particle feeding device is connected to the fine particle material inlet.

[0013] In one embodiment of this utility model, the coarse particle feeding device is a screw feeder; and / or

[0014] The fine particle feeding device is a screw feeder.

[0015] In one embodiment of the present invention, a heat exchanger is further included, which is configured to use the waste heat generated by the circulating fluidized bed gasification device to heat the steam gasification agent, thereby increasing the temperature of the steam gasification agent when it enters the pyrolysis gasification device and / or the high-temperature gasification chamber.

[0016] In one embodiment of this utility model, the bottom of the cyclone separator is connected to the lower part of the high-temperature gasification chamber so as to send the separated solid material back to the high-temperature gasification chamber.

[0017] In one embodiment of the present invention, a purification unit is further included, which is connected to the synthesis gas outlet disposed at the top of the cyclone separator.

[0018] Based on the above, compared with the prior art, the circulating fluidized bed gasification device provided by this utility model has a unique circulating fluidized bed device structure, in which the material is first gasified with low reactivity in the pyrolysis gasification zone, and then circulated and gasified again in the high-temperature gasification chamber. It has a wide range of raw material adaptability, more complete gasification, high mass and heat transfer efficiency, and more stable operation.

[0019] Other features and beneficial effects of this invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other beneficial effects of this invention can be realized and obtained through the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Unless otherwise specified, the positional relationships shown in the drawings in the following description are based on the direction in which the components are drawn in the figure.

[0021] Figure 1 The diagram shown is a structural schematic of a circulating fluidized bed gasification device provided in an embodiment of this utility model.

[0022] Figure label:

[0023] 10. Feeding device; 11. Coarse particle feeding assembly; 12. Fine particle feeding assembly; 20. Pyrolysis gasification device; 20a. Heating section; 20b. Conical section; 21. Coarse particle material inlet; 22 / 32. First gasifying agent inlet; 23 / 33. Second gasifying agent inlet; 30. High-temperature gasification chamber; 31. Fine particle material inlet; 40. Heat exchanger; 50. Cyclone separator; 51. Syngas outlet; 60. First grid plate; 70. Second grid plate. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The technical features designed in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0025] In the description of this utility model, it should be noted that all terms used in this utility model (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model pertains, and should not be construed as limiting this utility model; it should be further understood that the terms used in this utility model should be understood to have the same meaning as those in the context of this specification and in the relevant field, and should not be understood in an idealized or overly formal sense, except as expressly defined in this utility model.

[0026] One embodiment of this utility model provides a circulating fluidized bed gasification device, which is suitable for gasification feedstocks such as municipal solid waste that has been lightly carbonized and crushed.

[0027] Shallow carbonization typically refers to a carbonization temperature controlled at 230-290℃, which is much lower than the temperature for complete combustion (above 800℃) or deep carbonization (above 600℃).

[0028] At this temperature, volatile substances (such as moisture and small organic molecules) in organic components (such as kitchen waste, paper, plastics, etc.) are evaporated or decomposed, while the macromolecular structure only undergoes partial breakage and carbonization.

[0029] Please see Figure 1 The circulating fluidized bed gasification device includes a feeding device 10, a pyrolysis gasification device 20, a high-temperature gasification chamber 30, a heat exchanger 40, a cyclone separator 50, and a purification unit (not shown in the figure).

[0030] In this embodiment, the feeding device 10 consists of a coarse particle feeding assembly 11 and a fine particle feeding assembly 12; the fine particles are less than 3 mm in size, and the coarse particles are greater than 3 mm in size; the coarse particle feeding device 10 is connected to the coarse particle material inlet 21, and the fine particle feeding device 10 is connected to the fine particle material inlet 31. Specifically, the coarse particle feeding assembly 11 is connected to the coarse particle inlet, preferably using a screw feeder with wear-resistant steel screw blades, which can stably convey coarse particles; the fine particle feeding assembly 12 is connected to the fine particle inlet, and can also use a screw feeder with wear-resistant steel screw blades, suitable for conveying fine particles.

[0031] In this embodiment, the pyrolysis gasification device 20 includes a heating section 20a and a conical section 20b arranged along the direction of gravity. The heating section 20a has a cylindrical structure and can be made of a high-temperature resistant alloy material (such as 310S stainless steel), providing sufficient space and time for the pyrolysis of coarse-particle materials. The conical section 20b is located below the heating section 20a, also made of a high-temperature resistant alloy material, with a cone angle ranging from 45° to 90°, and a gradually decreasing diameter at the lower end, facilitating material aggregation and conveying.

[0032] In this embodiment, the first grid plate 60 is disposed inside the transition connection between the heating section 20a and the conical section 20b, and may be made of a high-temperature resistant metal material (such as a nickel-chromium alloy). The first grid plate 60 includes a plurality of first grid holes. In this embodiment, the first grid holes are circular to allow gas to pass through and to catch larger particles, preventing them from entering the conical section 20b prematurely.

[0033] It is understood that the heating section 20a of the pyrolysis gasification device 20 is not limited to a cylindrical shape, but can also be other structures such as a cuboid. Similarly, the first grid hole is not limited to a circle, but can also be other structures such as a square.

[0034] In this embodiment, the pyrolysis gasification device 20 has a first gasifying agent inlet 22 at the bottom and a coarse particle material inlet 21 and a second gasifying agent inlet 23 on the side wall. The first gasifying agent (water vapor gasifying agent) is introduced from the bottom. When the gas flows upward, it forms a countercurrent contact with the coarse particle material entering from above, increasing the contact time and contact area between the gasifying agent and the material, thus making the gasification reaction more complete. Simultaneously, the gas introduced from the bottom can provide some support for the material, helping it to form a good fluidization state within the pyrolysis gasification device 20 and preventing material accumulation.

[0035] A second gasifying agent (oxygen gasifying agent) inlet is provided on the side wall, which enables a more uniform distribution of oxygen within the pyrolysis gasification device 20, supplementing the amount of oxygen required for the reaction. The oxygen is thoroughly mixed with the upward-flowing material and the steam gasifying agent, allowing for adjustment of the oxygen content in the reaction, control of the reaction temperature, and prevention of excessively high or low local temperatures, ensuring the stable progress of the pyrolysis gasification reaction.

[0036] Coarse particles are fed in through the side wall. Once inside, the material moves downwards under gravity, creating a cross-flow with the upward-flowing gasifying agent, further enhancing the mixing effect. Side-wall feeding also prevents the material from directly impacting the bottom structure, reducing wear on the bottom of the unit and extending its service life.

[0037] In this embodiment, the high-temperature gasification chamber 30 is a cylindrical structure, for example, with a refractory brick lining and a steel plate shell, which can withstand high-temperature environments.

[0038] In this embodiment, the second grid plate 70 is disposed above the first gasifying agent inlet 32 ​​and / or the second gasifying agent inlet 33 of the high-temperature gasification chamber 30. The second grid plate 70 may be made of high-temperature resistant ceramic material. The second grid plate 70 includes a plurality of second grid holes, which are also circular. In a preferred embodiment of this invention, the aperture of the second grid holes is smaller than that of the first grid holes to accommodate the processing of fine particulate materials, allowing gas to pass through and collecting fine particulate matter.

[0039] In this embodiment, the upper part of the high-temperature gasification chamber 30 is connected to the pyrolysis gasification device 20 so as to send the first volatiles generated by the pyrolysis of coarse particles in the pyrolysis gasification device 20 into the high-temperature gasification chamber 30.

[0040] In this embodiment, the bottom of the high-temperature gasification chamber 30 is provided with a first gasifying agent inlet 32 ​​and a second gasifying agent inlet 33, and the side wall is provided with a fine particulate material inlet 31. When the gasifying agent is introduced from the bottom, the upward flow of the gas allows it to fully contact the fine particulate material, causing the fine particulate material to form a vigorous fluidization state within the high-temperature gasification chamber 30, thereby increasing the reaction rate. Simultaneously, the bottom air intake can re-raise materials deposited at the bottom, preventing material accumulation and ensuring that all materials participate in the reaction, thus improving material utilization.

[0041] Fine particulate material enters the high-temperature gasification chamber 30 from the side wall. After entering, it is rapidly diffused throughout the gasification chamber space under the action of airflow, and quickly mixes with the gasifying agent rising from the bottom. This feeding method can avoid the local accumulation of fine particulate material, ensuring that the material is evenly distributed in the high-temperature gasification chamber 30, which is conducive to the stable reaction.

[0042] In this embodiment, the cyclone separator 50 can adopt a tangential air intake structure, consisting of a cylinder, a cone, and an exhaust pipe, and is made of wear-resistant cast iron or ceramic. Its upper part is connected to the upper part of the high-temperature gasification chamber 30 through a pipe to send the second volatiles generated by gasification in the high-temperature gasification chamber 30 into the cyclone separator 50;

[0043] It should be noted that the second volatiles produced by gasification in the high-temperature gasification chamber 30 typically carry some solid particles. Feeding them from the top into the upper part of the cyclone separator 50 better suits the working principle of the cyclone separator 50. As the gas rotates within the cyclone separator 50, the solid particles are separated under centrifugal force, improving separation efficiency. Simultaneously, the second volatiles entering the upper part of the cyclone separator 50 directly from the top of the high-temperature gasification chamber 30 shortens the transport path, reduces energy loss during transport, and helps maintain gas pressure and flow rate, ensuring the normal operation of subsequent purification units. Furthermore, the upper connection method prevents solid particle deposition caused by reduced flow rate during transport, ensuring unobstructed pipeline flow and reducing equipment maintenance costs.

[0044] The bottom of the cyclone separator 50 is connected to the lower part of the high-temperature gasification chamber 30 via a return pipe, so as to send the separated solid material back to the high-temperature gasification chamber 30 and realize the recycling of materials. Specifically, the solid material separated by the cyclone separator 50 contains unreacted material. Sending it back to the lower part of the high-temperature gasification chamber 30 allows it to re-participate in the reaction, improving the utilization rate of materials and reducing resource waste. At the same time, the solid material sent back to the lower part of the high-temperature gasification chamber 30 can be rapidly fluidized under the action of the bottom gasifying agent, and fully mixed with the newly added fine particulate material and gasifying agent, ensuring a good fluidization state in the high-temperature gasification chamber 30 and promoting uniform reaction. Moreover, the returned solid material has a certain temperature, which can help maintain the temperature stability in the high-temperature gasification chamber 30, avoid excessive local temperature fluctuations caused by the addition of new materials, and ensure the consistency of reaction conditions.

[0045] In this embodiment, the syngas outlet 51 is located at the top of the cyclone separator 50. After cyclone separation, the solid material settles under gravity and returns to the high-temperature gasification chamber 30 from the bottom, while the syngas is discharged from the top outlet. This can reduce the amount of solid particles carried in the syngas, improve the purity of the syngas, and reduce the processing load of the subsequent purification unit.

[0046] In this embodiment, the heat exchanger 40 is a shell-and-tube heat exchanger 40, with the shell material being carbon steel and the heat exchange tubes being stainless steel. The heat exchanger 40 is configured to use the waste heat generated by the circulating fluidized bed gasification device to heat the steam gasification agent, thereby increasing the temperature of the steam gasification agent when it enters the pyrolysis gasification device 20 and / or the high-temperature gasification chamber 30, and thus improving the gasification reaction efficiency.

[0047] In another embodiment of this invention, the purification unit is connected to the syngas outlet 51 located at the top of the cyclone separator 50; for example, the purification unit includes a cooler, a dust collector, and a desulfurization tower connected in sequence. The cooler is water-cooled, which can reduce the temperature of the syngas to room temperature; the dust collector is a bag filter; the desulfurization tower uses a wet desulfurization process, using sodium hydroxide solution as a desulfurizing agent, which can reduce the sulfur content in the syngas, etc.

[0048] This utility model provides the working principle of the circulating fluidized bed gasification device as described in the above embodiment, as follows:

[0049] After pre-treatment processes such as drying and crushing, municipal solid waste is divided into waste materials of different sizes, which are then screened into coarse and fine particles. First, the first gasifying agent (steam gasifying agent) is introduced into the pyrolysis gasification furnace through a heat exchanger via the first gasifying agent inlet. Then, the coarse particles are fed into the pyrolysis gasification furnace through the coarse particle feeding assembly via the coarse particle inlet. Simultaneously, the second gasifying agent (oxygen gasifying agent) enters the pyrolysis gasification furnace through the second gasifying agent inlet. The oxygen-steam gasifying agent reacts with the coarse particles in a gasification reaction. The particles shrink, and low-reactivity volatiles are released in the pyrolysis gasification zone. Both are then conveyed to the high-temperature gasification chamber via a material conveying system. Simultaneously, the sieved fine particulate material is conveyed into the high-temperature gasification chamber through the fine particulate material inlet. The first gasifying agent (water vapor gasifying agent) and the second gasifying agent (oxygen gasifying agent) are continuously fed into the high-temperature gasification chamber from the first gasifying agent inlet and the second gasifying agent inlet at the bottom of the high-temperature gasification chamber. The fine particulate material and the gasifying agent react in a fluidized reaction in the high-temperature gasification chamber. To ensure a complete reaction, some material will be continuously returned to the high-temperature gasification chamber for recirculation and gasification through the cyclone separator. Finally, the gasified syngas enters the subsequent purification unit from the syngas outlet at the top of the cyclone separator.

[0050] In summary, compared with existing technologies, the circulating fluidized bed gasification device provided by this invention can efficiently process materials of different particle sizes. By setting up a pyrolysis gasification device to process coarse particles and a high-temperature gasification chamber to process fine particles, the gasification reaction is carried out according to the characteristics of different particle sizes, improving the degree of material reaction and thus increasing gasification efficiency. Secondly, the gasification technology used in the circulating fluidized bed gasification device provided by this invention is oxygen-water vapor circulating fluidized bed gasification technology, which differs from other municipal solid waste gasification technologies. Other technologies use fixed-bed gasifiers or entrained gasifiers, while this technology uses a circulating fluidized bed gasifier with oxygen-water vapor as the gasifying agent. This gasifier has low tar content, low fly ash content, high gasification intensity, and good syngas quality.

[0051] Furthermore, those skilled in the art should understand that although many problems exist in the prior art, each embodiment or technical solution of this utility model can be improved in only one or a few aspects, without necessarily solving all the technical problems listed in the prior art or background art simultaneously. Those skilled in the art should understand that any content not mentioned in a claim should not be construed as a limitation on that claim.

[0052] Although this document frequently uses terms such as feeding device, coarse particle feeding assembly, fine particle feeding assembly, pyrolysis gasification device, heating section, conical section, coarse particle material inlet, first gasifying agent inlet, second gasifying agent inlet, high-temperature gasification chamber, fine particle material inlet, heat exchanger, cyclone separator, syngas outlet, first grid plate, and second grid plate, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model. The terms "first," "second," etc. (if present), in the description, claims, and accompanying drawings of the embodiments of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A circulating fluidized bed gasification device, suitable for municipal solid waste materials that have undergone shallow carbonization and crushing, characterized in that, Includes a pyrolysis gasification unit, a high-temperature gasification chamber, and a cyclone separator; The bottom of the pyrolysis gasification device is provided with a first gasifying agent inlet, and the side wall is provided with a coarse particle material inlet and a second gasifying agent inlet; the upper part of the high-temperature gasification chamber is connected to the pyrolysis gasification device to send the first volatiles generated by the pyrolysis of coarse particles in the pyrolysis gasification device into the high-temperature gasification chamber; the bottom of the high-temperature gasification chamber is provided with a first gasifying agent inlet and a second gasifying agent inlet, and the side wall is provided with a fine particle material inlet; the upper part of the high-temperature gasification chamber is connected to the upper part of the cyclone separator to send the second volatiles generated by gasification in the high-temperature gasification chamber into the cyclone separator.

2. The circulating fluidized bed gasification device according to claim 1, characterized in that, The pyrolysis gasification device includes a heating section and a conical section arranged along the direction of gravity.

3. The circulating fluidized bed gasification device according to claim 2, characterized in that, It also includes a first grid plate, which is disposed inside the transition connection between the heating section and the conical section to allow gas to pass through and catch particulate matter.

4. The circulating fluidized bed gasification device according to claim 3, characterized in that, It also includes a second grid plate, which is disposed above the first gasifying agent inlet and / or the second gasifying agent inlet of the high-temperature gasification chamber to allow gas to pass through and catch particulate matter.

5. The circulating fluidized bed gasification device according to claim 4, characterized in that, The first grid plate includes a plurality of first grid holes, and the second grid plate includes a plurality of second grid holes, wherein the diameter of the second grid holes is smaller than the diameter of the first grid holes.

6. The circulating fluidized bed gasification device according to claim 1, characterized in that, The circulating fluidized bed gasification device also includes a feeding device, which consists of a coarse particle feeding component and a fine particle feeding component; the coarse particle feeding component is connected to the coarse particle material inlet, and the fine particle feeding component is connected to the fine particle material inlet.

7. The circulating fluidized bed gasification device according to claim 6, characterized in that, The coarse particle feeding assembly is a screw feeder; and / or The fine particle feeding assembly is a screw feeder.

8. The circulating fluidized bed gasification device according to claim 1, characterized in that, The circulating fluidized bed gasification device further includes a heat exchanger configured to use the waste heat generated by the circulating fluidized bed gasification device to heat the steam gasification agent, thereby increasing the temperature of the steam gasification agent when it enters the pyrolysis gasification device and / or the high-temperature gasification chamber.

9. The circulating fluidized bed gasification device according to claim 1, characterized in that, The bottom of the cyclone separator is connected to the lower part of the high-temperature gasification chamber so as to send the separated solid material back to the high-temperature gasification chamber.

10. The circulating fluidized bed gasification device according to claim 1, characterized in that, A purification unit is also included, which is in communication with a syngas outlet provided at the top of the cyclone separator.

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