System and method for blending combustion of fly ash of gasification furnace in circulating fluidized bed boiler

Abstract

The invention relates to a system and method for blending combustion of fly ash of a gasification furnace in a circulating fluidized bed boiler, and belongs to the technical field of fly ash circulation treatment. The system specifically comprises two groups of steel ash storehouses, a buffer tank is arranged at the bottom of each group of steel ash storehouses, a material distribution mechanism is arranged in each buffer tank, and a first feeding cylinder is arranged at the bottoms of the two groups of buffer tanks; combustion chambers are arranged at the two ends of the bottom of the first feeding cylinder correspondingly, the interiors of the combustion chambers are of wide-end-up structures, material scattering mechanisms are arranged at the bottoms of the combustion chambers correspondingly, and a second feeding cylinder is arranged at the bottoms of the two material scattering mechanisms jointly. Fly ash before combustion is pretreated, the fluidity and combustion stability of the fly ash are guaranteed, the fly ash is evenly stirred in the combustion process so as to improve the heating efficiency, the anti-blocking discharging design of the fly ash slag after combustion is optimized, the fly ash slag is screened, the fly ash slag which is not burnt out is separated for cyclic utilization, and the operation efficiency of the device is comprehensively improved.

Description

Technical Field

[0001] This invention relates to the field of fly ash recycling technology, specifically to a system and method for co-firing fly ash from a gasifier in a circulating fluidized bed boiler. Background Technology

[0002] The fly ash produced after the reaction in the pulverized coal gasifier is carried out of the furnace by the coal gas. After being collected by a cyclone dust collector and a bag filter, the clean coal gas is supplied to the user. The collected fly ash is called pulverized coal gasifier fly ash. Fly ash (such as by-products of coal gasification, biomass gasification, etc.) needs to be sent to the CFB boiler for combustion. The main purpose is to realize the resource utilization of fly ash, reduce waste disposal costs, and improve the combustion efficiency of the boiler. For example, a gasifier fly ash co-firing device with patent number CN216427217U, which uses multiple pipelines, fly ash bins, ash distributors, and limestone compartment structures, can achieve fly ash transportation and energy-saving distribution, but it is difficult to specifically address different time periods of fly ash combustion. Specifically, this is as follows: 1. Problems before and during fly ash combustion: (1) Insufficient pretreatment of fly ash particles, resulting in large differences in fly ash particle size, which can easily lead to uneven fluidization and instability of subsequent combustion; (2) Some fly ash hard particles are too large and can easily cause equipment wear. 2. Problems with ash and slag treatment after combustion: (1) Due to high viscosity or fine particles, the ash and slag are prone to accumulate in the slag discharge port or slag cooler, resulting in blockage or poor slag discharge; (2) The screening efficiency is low, and the unburned carbon is tightly mixed with the ash and slag, which can easily reduce the thermal efficiency of the system when it is recycled. Summary of the Invention

[0003] The purpose of this invention is to pre-treat fly ash before combustion to ensure its fluidity and combustion stability; to uniformly stir fly ash during combustion to improve heating efficiency; to optimize the anti-clogging discharge design of fly ash residue after combustion; and to screen it to separate unburned fly ash residue for recycling, thereby comprehensively improving the system operating efficiency.

[0004] The objective of this invention can be achieved through the following technical solution: a circulating fluidized bed boiler co-firing gasifier fly ash system, comprising two sets of steel ash silos, each set of steel ash silos having a buffer tank at the bottom, and a material distribution mechanism inside the buffer tank, both sets of buffer tanks having a common feeding cylinder I at the bottom, and combustion chambers being respectively provided at both ends of the bottom of the feeding cylinder I, the combustion chambers having a structure that is wider at the top and narrower at the bottom, and a material discharge mechanism being provided at the bottom of each combustion chamber, both sets of material discharge mechanisms having a common feeding cylinder II at the bottom; The material distribution mechanism includes a screening disc movably installed at the top of the buffer tank. A dual-axis motor is installed at the center of the bottom surface of the screening disc, and the top output end of the dual-axis motor extends to the upper end of the screening disc and is fixedly installed on a turntable. Scraper blades are fixedly installed at the four corners of the turntable, and the bottom surface of the scraper blades is in contact with the bottom surface of the screening disc. Vertical sliding rods are provided on the bottom surface of the screening disc at the front end and sides of the dual-axis motor. A spiral rotating rod is fixedly installed at the bottom output end of the dual-axis motor.

[0005] Furthermore, a spiral sleeve is sleeved at the top of the spiral rotating rod, and connecting rods are fixedly installed at the front and both ends of the spiral sleeve. Each set of connecting rods passes through the outside of the corresponding vertical sliding rod. A scraper ring is sleeved on the outside of the three sets of connecting rods, and the scraper ring is adapted to the inner wall of the buffer tank.

[0006] Furthermore, a heating roller is rotatably installed inside the feeding cylinder, and one end of the heating roller extends to the outside of the feeding cylinder and is equipped with a motor. The other end of the heating roller also extends to the outside of the feeding cylinder and is fixedly installed with a transmission wheel. Several sets of spiral material distribution grooves are respectively provided at both ends of the outer wall of the heating roller.

[0007] Furthermore, a guide frame is fixedly installed on the top of the second feeding cylinder, and a discharge trough is provided on one side of the guide frame. A spiral feeding rod is rotatably installed inside the second feeding cylinder, and a transmission wheel is also provided at one end of the spiral feeding rod extending to the outside of the second feeding cylinder. A transmission belt is sleeved between the upper and lower sets of transmission wheels.

[0008] Furthermore, the material discharge mechanism includes a discharge cylinder, which is rotatably connected to the discharge port at the bottom of the combustion chamber, and the bottom of the discharge cylinder is inserted into the inside of the guide frame. A limit gear is fixedly sleeved in the middle section of the discharge cylinder, and a scraper is fixedly installed inside one side of the discharge cylinder. The top of the scraper extends to the inner wall of the combustion chamber in a bent shape and is attached to the conical inner wall of the combustion chamber.

[0009] Furthermore, the two sets of limiting gears are meshed with a dual-shaft main rotating gear, and a second motor is installed at the top center of the dual-shaft main rotating gear via a rotating rod. The second motor is located at the bottom center of the feeding cylinder. The ends of the two sets of limiting gears away from each other are respectively meshed with dual-shaft driven rotating gears, and the top center of the dual-shaft driven rotating gear is rotatably connected to the bottom surface of the feeding cylinder via a rotating rod.

[0010] Furthermore, a second spiral rotating rod is fixedly installed at the center of the bottom surface of the dual-shaft main rotating gear, and guide rods are fixedly installed on the two sets of dual shafts from the center of the bottom of the rotating gear, and the guide rods extend into the inside of the guide frame. A second spiral sleeve is sleeved on the outside of the second spiral rotating rod, and the bottom of the second spiral sleeve extends into the inside and is fixedly installed with an inclined screen plate. The two ends of the screen plate pass through the outside of the two end guide rods respectively.

[0011] This invention also proposes an operation method for a circulating fluidized bed boiler co-firing gasifier fly ash system, comprising the following steps: Step 1: Pre-treatment of fly ash before combustion. By setting up a material distribution mechanism inside the buffer tank and a heating roller assembly inside the feeding cylinder, the fly ash is screened, crushed, and dried in sequence to ensure its fluidity and combustion stability. Step 2: Fly ash treatment during combustion. A material feeding mechanism is used to mix the fly ash particles entering the combustion chamber for combustion, thereby reducing fly ash accumulation and sticking, so as to achieve full heating of the fly ash particles. Step 3: Treatment of fly ash residue after combustion. First, use a material discharge mechanism to clear the fly ash residue discharged from the combustion chamber to reduce the blockage of the discharge port. Then, screen the discharged fly ash residue to separate the unburned fly ash residue for recycling.

[0012] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention is equipped with a buffer tank, a material distribution mechanism, and other components. It uses a screening disc to screen materials. A dual-shaft motor drives a turntable and a spiral rotating rod to rotate clockwise and counterclockwise. The turntable drives several sets of scraper blades to rotate along the surface of the screening disc and crush large particles of fly ash to achieve relatively uniform particle size of the fly ash material. At the same time, the spiral rotating rod rotates and rotates relative to the spiral sleeve, which forces the spiral sleeve and scraper ring to move up and down to facilitate scraping and discharging of fine fly ash particles adsorbed on the inner wall of the buffer tank, avoiding material retention and waste. Then, a rotating heating roller is used to dry and distribute the screened fly ash particles. This allows for the pretreatment of fly ash materials, including screening, crushing, and drying. It slows down the feeding speed of fly ash particles to reduce equipment impact and wear, while also ensuring the flowability and combustion stability of the fly ash.

[0013] 2. The present invention also includes components such as a combustion chamber, a material discharge mechanism, a second feeding cylinder, and a guide frame. The discharge cylinder drives the scraper to rotate, which not only uniformly stirs the material during combustion, but also assists in the discharge of fly ash and slag after combustion to reduce blockage. At the same time, it works in conjunction with a screen plate to screen unburned fly ash particles and burnt fly ash slag, so as to collect and recycle unburned fly ash particles. Attached Figure Description

[0014] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a planar sectional view of the overall structure of the present invention; Figure 3This is a half-sectional schematic diagram of the buffer tank of the present invention; Figure 4 This is a cross-sectional view of the buffer tank of the present invention; Figure 5 This is a cross-sectional view of the combined feeding cylinder 1, combustion chamber, material unloading mechanism and feeding cylinder 2 of the present invention; Figure 6 This is a three-dimensional schematic diagram of the combination of the discharge cylinder and the limiting gear of the present invention; Figure 7 This is a three-dimensional schematic diagram of the combination of the feeding cylinder 2 and the guide frame of the present invention; Figure 8 This is a schematic diagram of the operation method of the present invention.

[0016] In the diagram: 1. Steel ash silo; 2. Buffer tank; 3. Material distribution mechanism; 31. Screening disc; 32. Dual-shaft motor; 33. Turntable; 34. Scraper blade; 35. Vertical slide bar; 36. Spiral rotating rod one; 37. Spiral sleeve one; 38. Scraper ring; 4. Feeding cylinder one; 41. Heating roller; 42. Motor one; 43. Transmission wheel; 5. Combustion chamber; 6. Discharge mechanism; 60. Discharge cylinder; 61. Limit gear; 62. Scraper blade; 63. Dual-shaft main rotating gear; 64. Motor two; 65. Dual-shaft driven rotating gear; 66. Spiral rotating rod two; 67. Guide rod; 68. Spiral sleeve two; 69. Screening plate; 7. Feeding cylinder two; 71. Guide frame; 72. Spiral feeding rod. Detailed Implementation

[0017] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Example 1: Please refer to Figure 1 - Figure 7 As shown, the fly ash system of the gasifier co-firing gasifier in the circulating fluidized bed boiler includes two sets of steel ash silos 1. Each set of steel ash silos 1 is equipped with a buffer tank 2 at the bottom, and the buffer tank 2 is equipped with a material distribution mechanism 3. The bottom of the two sets of buffer tanks 2 is equipped with a feeding cylinder 4. The two ends of the bottom of the feeding cylinder 4 are respectively equipped with combustion chambers 5. The combustion chambers 5 have a structure that is wider at the top and narrower at the bottom. The bottom of the combustion chambers 5 is equipped with a material discharge mechanism 6. The bottom of the two sets of material discharge mechanisms 6 is equipped with a feeding cylinder 7. The material distribution mechanism 3 includes a screening disc 31 movably installed at the top of the buffer tank 2. A dual-axis motor 32 is installed at the center of the bottom surface of the screening disc 31. The top output end of the dual-axis motor 32 extends to the upper end of the screening disc 31 and is fixedly installed with a turntable 33. Scraper blades 34 are fixedly installed at the four corners of the turntable 33. The bottom surface of the scraper blades 34 is in contact with the bottom surface of the screening disc 31. Vertical sliding rods 35 are provided on the bottom surface of the screening disc 31 at the front end and sides of the dual-axis motor 32. A spiral rotating rod 36 is fixedly installed at the bottom output end of the dual-axis motor 32. A spiral sleeve 37 is sleeved on the top of the spiral rotating rod 36. Connecting rods are fixedly installed on the front and both ends of the spiral sleeve 37. Each set of connecting rods passes through the corresponding vertical sliding rod 35. A scraper ring 38 is sleeved on the outside of the three sets of connecting rods. The scraper ring 38 is adapted to the inner wall of the buffer tank 2. In actual operation, fly ash is stored in two sets of steel ash silos 1. Before co-firing, some fly ash is poured into the corresponding buffer tank 2. The buffer tank 2 is used to screen and discharge the material to avoid the situation where particles collide with the combustion chamber 5 and cause wear due to direct discharge. The specific pretreatment process is as follows: the fly ash material is first screened through the screen plate 31, and the large particles of material are retained on the surface of the screen plate 31. Then, the dual-shaft motor 32 is started to drive the turntable 33 and the spiral rod 36 to rotate clockwise and counterclockwise at the same time. The turntable 33 drives several sets of scraper blades 34 to rotate along the surface of the screen plate 31 and crush large particles of fly ash slag to achieve relatively uniform particle size of fly ash material. At the same time, the spiral rotating rod 36 rotates on its own and rotates relative to the spiral sleeve 37, which forces the spiral sleeve 37 and the scraper ring 38 to move up and down to facilitate scraping and feeding of fine fly ash particles adsorbed on the inner wall of the buffer tank 2, avoiding material retention and waste. A heating roller 41 is rotatably installed inside the feeding cylinder 4. One end of the heating roller 41 extends to the outside of the feeding cylinder 4 and is equipped with a motor 42. The other end of the heating roller 41 also extends to the outside of the feeding cylinder 4 and is fixedly installed with a transmission wheel 43. Several sets of spiral material distribution grooves are respectively provided at both ends of the outer wall of the heating roller 41. The fly ash particles that have been screened and crushed sink into the corresponding feeding cylinder 4 and slide into the spiral distribution groove on the surface of the heating roller 41. The heating roller 41 is used to further dry and distribute the screened fly ash particles. The motor 42 is started to drive the heating roller 41 and the transmission wheel 43 to rotate. The material also rotates with the heating roller 41 and is introduced into the corresponding combustion chamber 5. The fly ash that has been doubly dispersed can slow down the feeding speed of the fly ash particles to a certain extent and reduce the impact and wear on the inner wall of the combustion chamber 5. This enables pretreatment of fly ash materials, including screening, crushing, and drying, which slows down the feeding speed of fly ash particles to reduce equipment impact and wear, while ensuring fly ash flowability and combustion stability. Example 2: Please refer to Figure 5 - Figure 7 As shown, the material discharge mechanism 6 includes a discharge cylinder 60, which is rotatably connected to the discharge port at the bottom of the combustion chamber 5. The bottom of the discharge cylinder 60 is inserted into the guide frame 71. A limit gear 61 is fixedly sleeved in the middle section of the discharge cylinder 60. A scraper 62 is fixedly installed inside one side of the discharge cylinder 60. The top of the scraper 62 is bent and extends to the inner wall of the combustion chamber 5 and is attached to the conical inner wall of the combustion chamber 5. Two sets of limiting gears 61 mesh together with a double-shaft main rotating gear 63, and a second motor 64 is installed at the top center of the double-shaft main rotating gear 63 via a rotating rod. The second motor 64 is located at the bottom center of the feeding cylinder 4. The ends of the two sets of limiting gears 61 away from each other are respectively meshed with double-shaft driven rotating gears 65, and the top center of the double-shaft driven rotating gear 65 is rotatably connected to the bottom surface of the feeding cylinder 4 via a rotating rod. During the combustion process: the pre-treated fly ash material is poured into two sets of combustion chambers 5 respectively, the discharge valve at the bottom of the combustion chamber 5 is closed, and then the motor 64 is started to drive the dual-shaft main rotating gear 63 to rotate, and drive the corresponding limit gear 61 to rotate. The dual-shaft driven gear 65, which meshes with the limit gear 61, also rotates accordingly. Therefore, the limiting gear 61 and the discharge cylinder 60 located between the two adjacent sets of dual-shaft driven gears 65 and dual-shaft main gears 63 rotate stably. The scraper 62 rotates with the discharge cylinder 60 and stirs the fly ash material so as to heat it evenly. It also scrapes the material on the inner wall of the combustion chamber 5 to prevent the heated fly ash from sticking to the inner wall of the combustion chamber 5. It is worth noting that when the fly ash residue formed by the complete combustion of fly ash is discharged, the discharge valve at the bottom of the combustion chamber 5 is opened, and then the fly ash residue is fed into the feed cylinder 7 through the discharge cylinder 60. At this time, the rotating scraper 62 is used to stir and discharge the sinking material to reduce blockage. Example 3: Please refer to Figure 5 and Figure 7 As shown, a guide frame 71 is fixedly installed on the top of the feeding cylinder 2 7, and a discharge chute is provided on one side of the guide frame 71. A spiral feeding rod 72 is rotatably installed inside the feeding cylinder 2 7, and a drive wheel 43 is also provided at one end of the spiral feeding rod 72 extending to the outside of the feeding cylinder 2 7. A drive belt is sleeved between the upper and lower sets of drive wheels 43. A spiral rotating rod 66 is fixedly installed at the center of the bottom surface of the dual-shaft main rotating gear 63. Two sets of dual shafts are fixedly installed with guide rods 67 at the center of the bottom of the rotating gear 65, and the guide rods 67 extend into the inside of the guide frame 71. A spiral sleeve 68 is sleeved on the outside of the spiral rotating rod 66, and the bottom of the spiral sleeve 68 extends into the inside and is fixedly installed with an inclined screen plate 69. The two ends of the screen plate 69 pass through the outside of the two end guide rods 67.

[0019] The fully combusted fly ash is discharged through two sets of discharge cylinders 60 and introduced onto the surface of the inclined screen plate 69. The burnt fly ash is screened down through the mesh of the screen plate 69 and fed into the second feeding cylinder 7. The two sets of drive wheels 43 rotate simultaneously under the drive of the drive belt. The bottom drive wheel 43 drives the spiral feed rod 72 to rotate synchronously and feed the material into the second feeding cylinder 7. The ash that does not pass through the screen plate 69 is unburned fly ash particles, which slide down the inclined surface of the screen plate 69 to the discharge chute for collection and subsequent recycling. It is worth noting that during the clockwise or counterclockwise rotation of the dual-shaft main rotating gear 63, the second spiral rotating rod 66 rotates synchronously with the dual-shaft main rotating gear 63 and rotates relative to the second spiral sleeve 68, forcing the second spiral sleeve 68 to pull the screen plate 69 to move up and down reciprocally, and the two ends of the screen plate 69 move up and down along the guide rod 67 to accelerate the screening speed of the material on the surface of the screen plate 69.

[0020] Example 4: Please refer to Figure 1 - Figure 8 As shown, the present invention also proposes an operation method for a circulating fluidized bed boiler co-firing gasifier fly ash system, including the following steps: Step 1: Pre-treatment of fly ash before combustion. By setting up a material distribution mechanism 3 inside the buffer tank 2 and a heating roller 41 assembly inside the feeding cylinder 4, the fly ash is screened, crushed, and dried in sequence to ensure its fluidity and combustion stability. Step 2: Fly ash treatment during combustion. The fly ash particles entering the combustion chamber 5 are mixed and burned using the material feeding mechanism 6 to reduce fly ash accumulation and sticking, so as to achieve full heating of the fly ash particles. Step 3: After combustion, the fly ash residue is treated by first using the material discharge mechanism 6 to clear the fly ash residue discharged from the combustion chamber 5 to reduce the blockage of the discharge port. Then, the discharged fly ash residue is screened to separate the unburned fly ash residue for recycling.

[0021] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A circulating fluidized bed boiler co-firing gasifier fly ash system, comprising two sets of steel ash silos (1), characterized in that: Each of the steel ash silos (1) is equipped with a buffer tank (2) at the bottom, and a material distribution mechanism (3) is provided inside the buffer tank (2). The bottom of the two sets of buffer tanks (2) is provided with a feeding cylinder (4), and the two ends of the bottom of the feeding cylinder (4) are respectively provided with combustion chambers (5). The combustion chamber (5) has a structure that is wider at the top and narrower at the bottom, and the bottom of the combustion chamber (5) is provided with a material discharge mechanism (6). The bottom of the two sets of material discharge mechanisms (6) is provided with a feeding cylinder (7). The material distribution mechanism (3) includes a screening disc (31) movably disposed at the top of the buffer tank (2). A dual-axis motor (32) is disposed at the center of the bottom surface of the screening disc (31). The top output end of the dual-axis motor (32) extends to the upper end of the screening disc (31) and is fixedly mounted on a turntable (33). Scraper blades (34) are fixedly mounted at the four corners of the turntable (33). The bottom surface of the scraper blades (34) is in contact with the bottom surface of the screening disc (31). Vertical sliding rods (35) are disposed at the front end and sides of the dual-axis motor (32) on the bottom surface of the screening disc (31). A spiral rotating rod (36) is fixedly mounted at the bottom output end of the dual-axis motor (32).

2. The circulating fluidized bed boiler co-firing gasifier fly ash system according to claim 1, characterized in that, The spiral rotating rod (36) is sleeved at the top of the spiral sleeve (37), and the spiral sleeve (37) is fixedly installed at the front end and both ends. Each set of connecting rods passes through the corresponding vertical sliding rod (35). The three sets of connecting rods are sleeved together with a scraper ring (38), and the scraper ring (38) is adapted to the inner wall of the buffer tank (2).

3. The circulating fluidized bed boiler co-firing gasifier fly ash system according to claim 1, characterized in that, The feeding cylinder (4) is equipped with a heating roller (41) that rotates inside. One end of the heating roller (41) extends to the outside of the feeding cylinder (4) and is equipped with a motor (42). The other end of the heating roller (41) also extends to the outside of the feeding cylinder (4) and is fixedly installed with a transmission wheel (43). Several sets of spiral material distribution grooves are respectively provided at both ends of the outer wall of the heating roller (41).

4. The circulating fluidized bed boiler co-firing gasifier fly ash system according to claim 1, characterized in that, The top of the feeding cylinder (7) is fixedly installed with a guide frame (71), and a discharge trough is provided on one side of the guide frame (71). The feeding cylinder (7) is rotatably provided with a spiral feeding rod (72), and one end of the spiral feeding rod (72) extends to the outside of the feeding cylinder (7) and is also provided with a transmission wheel (43). The upper and lower sets of transmission wheels (43) are connected together with a transmission belt.

5. The circulating fluidized bed boiler co-firing gasifier fly ash system according to claim 1, characterized in that, The material discharge mechanism (6) includes a discharge cylinder (60), which is rotatably connected to the discharge port at the bottom of the combustion chamber (5), and the bottom of the discharge cylinder (60) is inserted into the guide frame (71). A limit gear (61) is fixedly sleeved in the middle section of the discharge cylinder (60), and a scraper (62) is fixedly installed inside one side of the discharge cylinder (60). The top of the scraper (62) extends to the inner wall of the combustion chamber (5) in a bent shape and is attached to the conical inner wall of the combustion chamber (5).

6. The circulating fluidized bed boiler co-firing gasifier fly ash system according to claim 5, characterized in that, The two sets of limiting gears (61) are meshed together with a double-shaft main rotating gear (63), and a motor (64) is installed at the top center of the double-shaft main rotating gear (63) through a rotating rod. The motor (64) is installed at the bottom center of the feeding cylinder (4). The ends of the two sets of limiting gears (61) away from each other are respectively meshed with a double-shaft driven rotating gear (65), and the top center of the double-shaft driven rotating gear (65) is rotatably connected to the bottom surface of the feeding cylinder (4) through a rotating rod.

7. The circulating fluidized bed boiler co-firing gasifier fly ash system according to claim 6, characterized in that, A spiral rotating rod (66) is fixedly installed at the center of the bottom surface of the dual-shaft main rotating gear (63). Two sets of dual shafts are respectively fixedly installed with guide rods (67) from the center of the bottom of the rotating gear (65), and the guide rods (67) extend into the inside of the guide frame (71). A spiral sleeve (68) is sleeved on the outside of the spiral rotating rod (66), and the bottom of the spiral sleeve (68) extends into the inside and is fixedly installed with an inclined screen plate (69). The two ends of the screen plate (69) pass through the outside of the two end guide rods (67).

8. The operating method of the circulating fluidized bed boiler co-firing gasifier fly ash system according to any one of claims 1-7, characterized in that, Includes the following steps: Step 1: Pre-treatment of fly ash before combustion. By setting up a material distribution mechanism (3) inside the buffer tank (2) and a heating roller (41) assembly inside the feeding cylinder (4), the fly ash is screened, crushed, and dried in sequence to ensure its fluidity and combustion stability. Step 2: Fly ash treatment during combustion. The fly ash particles entering the combustion chamber (5) are mixed and burned using the material feeding mechanism (6) to reduce fly ash accumulation and sticking, so as to achieve full heating of fly ash particles. Step 3: After combustion, fly ash is treated. First, the discharge mechanism (6) is used to clear the fly ash discharged from the combustion chamber (5) to reduce the blockage of the discharge port. Then, the discharged fly ash is screened to separate the unburned fly ash for recycling.

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