Integrated off-gas treatment system and process for making a fracturing proppant ceramsite sand

Abstract

This invention belongs to the field of ceramsite sand preparation technology, specifically relating to an integrated waste gas treatment system for the preparation of fracturing proppant ceramsite sand. The system includes a pretreatment cooling tower, a bag filter, a dry desulfurization tower, an SCR desulfurization unit, an activated carbon adsorption tower, and a chimney, connected sequentially via pipelines. The pretreatment cooling tower is connected to the high-temperature flue gas from the rotary kiln. The bag filter includes a dust collector body with a mounting platform fixed inside. Filter bags are evenly distributed along a matrix on the mounting platform. The dust collector body is equipped with a dust removal device for cleaning the filter bags. This invention effectively solves the problem of poor dust removal efficiency in existing technologies.

Description

Technical Field

[0001] This invention belongs to the field of ceramsite sand preparation technology, specifically relating to an integrated waste gas treatment system and preparation process for the preparation of fracturing proppant ceramsite sand. Background Technology

[0002] Ceramsite sand, a proppant for hydraulic fracturing, is a key material used in oil and gas extraction. In fracturing operations in low-permeability reservoirs such as shale gas and tight oil, ceramsite sand is injected under high pressure into rock fractures to prop them up, prevent closure, and establish long-term effective oil and gas flow channels. Compared with traditional quartz sand, it has higher compressive strength (can withstand a closure pressure of 92MPa), lower breakage rate (<7%), higher temperature resistance (>200℃), and better sphericity / roundness, resulting in significantly improved conductivity. With its high strength, low pollution, and adaptability to complex reservoirs, ceramsite sand has become a core material for unconventional oil and gas extraction.

[0003] The entire process of preparing fracturing proppant ceramsite sand can be divided into seven main stages: raw material pretreatment → batching and grinding → granulation and sieving → drying → rotary kiln sintering → cooling → finished product sieving and packaging. During the rotary kiln sintering process, pollutants such as high-temperature flue gas, particulate matter, sulfur dioxide (SO2), and nitrogen oxides (NOx) are generated. These pollutants require integrated waste gas treatment systems to achieve ultra-low emissions, meet stringent environmental standards (such as DB14 "Emission Standard for Air Pollutants in Refractory Materials Industry"), and simultaneously reduce energy consumption and operating costs.

[0004] Integrated waste gas treatment systems typically include units such as bag filters, dry desulfurization towers, and SCR desulfurization units to treat waste gas. However, after a period of use, existing bag filters accumulate dust on the filter bags, affecting their filtration efficiency and increasing the dust concentration in the exhaust air, thus impacting the dust removal effect of the bag filter. Therefore, regularly cleaning the dust on the filter bags becomes an essential task, usually done through appropriate dust removal devices.

[0005] For example, utility model patent application number 201721137066.0 discloses a dust cleaning device and a bag filter, which solves the technical problem that dust easily adheres to the filter bags after a period of use in industrial dust removal, making it difficult to perform simple and effective dust cleaning, thus greatly reducing the dust removal efficiency of the bag filter. This utility model sets up a dust cleaning device between the filter bags of the bag filter, consisting of a sinusoidal linkage mechanism, a translational main beam, a connecting rod, and a swing arm. The sinusoidal linkage mechanism drives the translational main beam to perform a reciprocating translational motion on the horizontal plane, causing the connecting rod, hinged to the translational main beam, to also perform a reciprocating translational motion on the horizontal plane. This causes the swing arm, fixed to the connecting rod, to swing left and right, striking the filter bags from both sides, causing the dust adhering inside the filter bags to be shaken off by the external force.

[0006] The aforementioned application describes a dust removal process where a swing arm is used to strike the bag from both sides, causing the dust adhering inside the bag to be shaken off. However, in practical use, the following technical problems still exist: 1. The fixed striking position of the swing arm allows for effective dust removal, but the dust removal effect decreases as the distance from the swing arm on the bag increases, affecting the dust removal operation; 2. The single striking method of the swing arm, which only strikes the bag, results in a limited dust removal method and is ineffective at removing stubborn dust from the upper part of the bag, failing to complete the dust removal operation effectively. Summary of the Invention

[0007] In view of the above situation and to overcome the defects of the prior art, the present invention provides an integrated waste gas treatment system and preparation process for fracturing proppant ceramsite sand, which effectively solves the problem of poor dust removal effect in the prior art.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: an integrated waste gas treatment system for fracturing proppant ceramsite sand preparation, comprising a pretreatment cooling tower, a bag filter, a dry desulfurization tower, an SCR desulfurization unit, an activated carbon adsorption tower, and a chimney connected sequentially by pipelines; the pretreatment cooling tower is connected to the high-temperature flue gas of the rotary kiln; the bag filter includes a dust collector body, an installation platform fixedly connected inside the dust collector body, and filter bags evenly distributed along a matrix on the installation platform; the dust collector body is equipped with a dust removal device for cleaning the filter bags.

[0009] Furthermore, the dust removal device includes multiple striking frames arranged along the height direction of the cloth bag, which can move synchronously in a straight line and up and down. A mesh frame is slidably connected above each of the multiple striking frames. The up and down movement of the striking frames can drive the mesh frame to move up and down. The horizontal and vertical bars of the mesh frame are respectively arranged between adjacent cloth bags. Dust removal structures are evenly distributed on the striking frames. The dust removal structures are located below the intersection of the horizontal and vertical bars of the mesh frame. The dust removal structures clean the cloth bag by sliding up and down along the striking frames with the mesh frame. The dust removal structures and the mesh frame squeeze and shake the cloth bag with the linear movement of the striking frames.

[0010] Furthermore, the dust collector body has multiple lifting frames, each corresponding to a striking frame, evenly distributed from top to bottom. The striking frame is slidably connected to the corresponding lifting frame. The dust collector body is provided with a lifting structure that drives the lifting frame to move up and down. The dust collector body also has multiple drive frames, each corresponding to a mesh frame, evenly distributed from top to bottom. The mesh frame is slidably connected to the drive frame. The dust collector body is provided with a traction structure that drives the drive frame to slide along the lifting frame.

[0011] Furthermore, a connecting rod is provided between adjacent lifting frames and adjacent drive frames, and adjacent lifting frames are connected by corresponding connecting rods; a guide frame is fixedly connected inside the dust collector body, and the connecting rod is slidably connected to the guide frame; a guide cylinder is fixedly connected to both the lifting frame and the drive frame, and a guide rod is slidably connected to the guide cylinder on both the striking frame and the mesh frame.

[0012] Furthermore, a synchronization frame is fixedly connected to the guide rod of the mesh frame, and a vertically arranged connecting frame is fixedly connected to each of the multiple synchronization frames; a telescopic rod is fixedly connected to the dust collector body, and a slider that can slide vertically along the connecting frame is fixedly connected to the telescopic end of the telescopic rod.

[0013] Furthermore, the lifting structure includes a lifting motor fixedly connected to the dust collector body, and the output end of the lifting motor is connected to a lifting bevel gear set; the output end of the lifting bevel gear set is connected to a lead screw, and one of the lifting frames is screwed to the lead screw.

[0014] Furthermore, the traction structure includes a drive motor fixedly connected to the dust collector body, and a drive bevel gear set connected to the output end of the drive motor; a spline shaft connected to the output end of the drive bevel gear set, and a spline cylinder rotatably connected to the lifting frame and slidably connected to the spline shaft; a driving bevel gear fixedly connected to the spline cylinder, and a driven bevel gear meshing with the driving bevel gear; a crank connected to the driven bevel gear, and a traction rod rotatably connected to the crank, the traction rod being rotatably connected to the corresponding drive frame.

[0015] Furthermore, the dust removal structure includes a support block fixedly connected to the striking frame, and a plurality of rotating rods rotatably connected to the support block are evenly distributed along the circumference of the support block. Each rotating rod is fixedly connected to a dust removal hammer for striking the cloth bag.

[0016] Furthermore, a drive rod is fixedly connected to the intersection of the horizontal and vertical rods of the mesh frame, and the drive rod is slidably connected to the support block; a mounting block is fixedly connected to the drive rod, and multiple active rods that are rotatably connected to the mounting block are evenly distributed along the circumference of the mounting block; an extension rod is fixedly connected to each of the multiple rotating rods, and the multiple active rods are rotatably connected to the corresponding extension rods respectively.

[0017] A process for preparing fracturing proppant ceramsite sand includes the following steps:

[0018] S1. The semi-finished ceramsite is fed into the rotary kiln. Inside the kiln, the semi-finished ceramsite is continuously lifted and scattered as the kiln rotates, forming a uniform material curtain, and slowly moving towards the kiln head. The semi-finished ceramsite is dried at 600°C-1050°C in the preheating section of the rotary kiln, sintered at 1050°C-1350°C in the sintering reaction zone of the rotary kiln, and finally calcined at 1300°C-1250°C in the heat treatment zone of the rotary kiln. After calcination, the finished ceramsite is obtained.

[0019] S2. The high-temperature flue gas generated by the rotary kiln is fed into the pretreatment cooling tower of the integrated waste gas treatment system made of fracturing proppant ceramsite sand. The waste gas is treated by a bag filter, a dry desulfurization tower, an SCR desulfurization unit, and an activated carbon adsorption tower. The treated flue gas is discharged through the chimney.

[0020] S3. The calcined ceramsite product from step S1 is sent into a cooling kiln to cool to room temperature.

[0021] S4. The cooled ceramsite product from step S2 is fed into a screening machine to screen out the ceramsite product of the required specifications.

[0022] Furthermore, the required specifications for step S4 are: 16 / 30 mesh, 20 / 40 mesh, 30 / 50 mesh, and 40 / 70 mesh.

[0023] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows:

[0024] In use, the present invention allows the mesh frame to slide along the striking frame, thereby enabling the dust removal structure to strike and clean the cloth bag. The dust removal structure and the mesh frame squeeze and shake the cloth bag as the striking frame moves linearly, making the dust removal method of the present invention diverse. By raising and lowering the striking frame and the mesh frame, the dust removal structure on the striking frame can thoroughly clean the cloth bag, thereby improving the dust removal effect of the dust removal device. Attached Figure Description

[0025] Figure 1 This is a connection block diagram of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of the bag filter in this invention;

[0027] Figure 3 This is a schematic diagram showing the coordinated state of the bag, dust removal device, and other structures in this invention;

[0028] Figure 4 This is a bottom view showing the coordinated state of the bag, dust removal device, and other structures in this invention;

[0029] Figure 5 This is a first perspective view of the dust removal device in this invention;

[0030] Figure 6 This is a second perspective view of the dust removal device in this invention;

[0031] Figure 7 This is a top view of the dust removal device in this invention;

[0032] Figure 8 This is a schematic diagram showing the coordinated state of the lifting frame, drive frame, connecting rod, guide cylinder, and other structures in this invention.

[0033] Figure 9 In this invention Figure 8 Enlarged view of region A in the middle;

[0034] Figure 10 This is a schematic diagram showing the cooperative state of the telescopic rod, slider, connecting frame, mesh frame, and other structures in this invention;

[0035] Figure 11 This is a schematic diagram showing the cooperative state of the dust removal structure, drive rod, active rod, and other structures in this invention.

[0036] In the diagram: 1. Dust collector body, 2. Collection hopper, 3. Air inlet, 4. Filter bag, 5. Air outlet, 6. Dust removal device, 7. Dust discharge pipe, 8. Lifting motor, 9. Lead screw, 10. Lifting frame, 11. Drive motor, 12. Drive bevel gear set, 13. Splined shaft, 14. Drive frame, 15. Mesh frame, 16. Impact frame, 17. Dust removal structure, 18. Telescopic rod, 19. Guide frame, 20. Connecting frame, 21. Slider, 22. Connecting rod, 23. Guide cylinder, 24. Splined cylinder, 25. Driving bevel gear, 26. Driven bevel gear, 27. Crank, 28. Traction rod, 29. Guide rod, 30. Synchronizing frame, 31. Drive rod, 32. Support block, 33. Rotating rod, 34. Driving rod, 35. Extension rod, 36. Dust removal hammer, 37. Mounting block. Detailed Implementation

[0037] An integrated waste gas treatment system prepared from fracturing proppant ceramsite sand, such as Figure 1-11As shown, the system includes a pretreatment cooling tower, a bag filter, a dry desulfurization tower, an SCR desulfurization unit, an activated carbon adsorption tower, and a chimney, which are connected in sequence by pipelines. The pretreatment cooling tower is connected to the high-temperature flue gas of the rotary kiln. An induced draft fan is installed on the pipeline between the SCR desulfurization unit and the activated carbon adsorption tower. The air volume is automatically adjusted according to the system resistance to ensure stable negative pressure operation of the system.

[0038] The bag filter dust collector includes a dust collector body 1, an installation platform fixed inside the dust collector body 1, and filter bags 4 evenly distributed along a matrix on the installation platform. The dust collector body 1 is equipped with a dust cleaning device 6 for cleaning the filter bags 4. A collection hopper 2 for collecting dust is connected to the dust collector body 1 and is located below the filter bags 4. The collection hopper 2 is equipped with a dust discharge pipe 7. The collection hopper 2 is equipped with an air inlet 3, and the dust collector body 1 is equipped with an air outlet 5. The air outlet 5 is located above the installation platform, and the gas filtered by the filter bags 4 is discharged through the air outlet 5.

[0039] Furthermore, such as Figure 5 and Figure 6 As shown, the dust removal device 6 includes multiple striking frames 16 arranged along the height direction of the cloth bag 4, which can move synchronously in a straight line and up and down. A mesh frame 15 is slidably connected above each of the multiple striking frames 16. The up and down movement of the striking frames 16 can drive the mesh frame 15 to move up and down. The horizontal and vertical bars of the mesh frame 15 are respectively arranged between adjacent cloth bags 4. Dust removal structures 17 are evenly distributed on the striking frames 16. The dust removal structures 17 are located below the intersection of the horizontal and vertical bars of the mesh frame 15. The dust removal structures 17 clean the cloth bag 4 by sliding up and down along the striking frames 16 with the mesh frame 15. The dust removal structures 17 and the mesh frame 15 squeeze and shake the cloth bag 4 with the straight movement of the striking frames 16.

[0040] When in use, the dust removal device 6 slides along the tapping frame 16 via the mesh frame 15, thereby causing the dust removal structure 17 to tap and clean the cloth bag 4. The dust removal structure 17 and the mesh frame 15 squeeze and shake the cloth bag 4 as the tapping frame 16 moves linearly, making the dust removal method of the present invention diverse. By raising and lowering the tapping frame 16 and the mesh frame 15, the dust removal structure 17 on the tapping frame 16 can thoroughly clean the cloth bag 4, thereby improving the dust removal effect of the dust removal device 6.

[0041] Furthermore, the dust collector body 1 is provided with multiple lifting frames 10, each corresponding to a striking frame 16, evenly distributed from top to bottom. The striking frame 16 is slidably connected to the corresponding lifting frame 10. The dust collector body 1 is provided with a lifting structure that drives the lifting frame 10 to move up and down. The lifting structure drives the lifting frame 10 to move up and down, thereby driving the striking frame 16 to move up and down. In addition, the striking frame 16 can also slide along the lifting frame 10 in a straight line. The dust collector body 1 is provided with multiple drive frames 14, each corresponding to a mesh frame 15, evenly distributed from top to bottom. The mesh frame 15 and the drive frames are connected. 14. A sliding connection is provided on the dust collector body 1, which drives the drive frame 14 to slide along the lifting frame 10. The traction structure connects the drive frame 14 and the lifting frame 10 into one unit, so that when the lifting frame 10 moves up and down, the drive frame 14 moves up and down synchronously. In addition, the traction structure can also drive the drive frame 14 to slide along the lifting frame 10. Since the mesh frame 15 is slidably connected to the drive frame 14, the drive frame 14 can drive the mesh frame 15 to slide along the striking frame 16, thereby driving the dust removal structure 17 and causing the dust removal structure 17 to strike and clean the filter bag 4.

[0042] Furthermore, such as Figure 8 As shown, connecting rods 22 are provided between adjacent lifting frames 10 and adjacent drive frames 14. Adjacent lifting frames 10 are connected by corresponding connecting rods 22, and adjacent drive frames 14 are connected by corresponding connecting rods 22. A guide frame 19 is fixedly connected inside the dust collector body 1, and the connecting rods 22 are slidably connected to the guide frame 19. The connecting rods 22 on the lifting frames 10 enable multiple lifting frames 10 arranged from top to bottom to move up and down synchronously. The connecting rods 22 on the drive frames 14 enable multiple drive frames 14 arranged from top to bottom to move up and down synchronously. The guide frame 19 guides the connecting rods 22 to improve the stability of the lifting frames 10 and drive frames 14. Guide cylinders 23 are fixedly connected to both the lifting frames 10 and drive frames 14, and guide rods 29 are slidably connected to the guide cylinders 23 on both the striking frame 16 and the mesh frame 15. The guide cylinders 23 guide the guide rods 29, enabling the striking frame 16 and the mesh frame 15 to move linearly.

[0043] Furthermore, such as Figure 10As shown, a synchronous frame 30 is fixedly connected to the guide rod 29 of the mesh frame 15, and a vertically arranged connecting frame 20 is fixedly connected to each of the synchronous frames 30; a telescopic rod 18 is fixedly connected to the dust collector body 1, and a slider 21 that can slide vertically along the connecting frame 20 is fixedly connected to the telescopic end of the telescopic rod 18; when the mesh frame 15 moves linearly, the telescopic rod 18 is activated, and the telescopic rod 18, through the slider 21 and the connecting frame 20, drives the synchronous frame 30 to move, and the synchronous frame 30 drives the guide rod 29 to slide along the guide cylinder 23, and the guide rod 29 drives the mesh frame 15 to move linearly; when the mesh frame 15 moves up and down, the mesh frame 15 drives the connecting frame 20 to move up and down through the guide rod 29 and the synchronous frame 30, and the connecting frame 20 slides up and down along the slider 21.

[0044] Furthermore, such as Figure 5 As shown, the lifting structure includes a lifting motor 8 fixedly connected to the dust collector body 1, and a lifting bevel gear set connected to the output end of the lifting motor 8; a lead screw 9 is connected to the output end of the lifting bevel gear set, and one of the lifting frames 10 is screwed to the lead screw 9; when the lifting structure drives the lifting frame 10 to move up and down, the lifting motor 8 drives the lead screw 9 to rotate through the lifting bevel gear set, and the lead screw 9 drives the lifting frame 10 to move up and down. The guide frame 19 guides the connecting rod 22 on the lifting frame 10 to realize the up and down movement of the lifting frame 10.

[0045] Furthermore, such as Figure 5 , 8 As shown in Figure 9, the traction structure includes a drive motor 11 fixedly connected to the dust collector body 1, and a drive bevel gear set 12 connected to the output end of the drive motor 11; a spline shaft 13 connected to the output end of the drive bevel gear set 12, and a spline cylinder 24 rotatably connected to the lifting frame 10 and slidably connected to the spline shaft 13; a driving bevel gear 25 fixedly connected to the spline cylinder 24, and a driven bevel gear 26 meshing with the driving bevel gear 25; a crank 27 connected to the driven bevel gear 26, and a traction rod 28 rotatably connected to the crank 27, and the traction rod 28 rotatably connected to the corresponding drive frame 14.

[0046] When the traction structure drives the mesh frame 15 to slide along the striking frame 16, the drive motor 11 drives the spline shaft 13 to rotate through the drive bevel gear set 12. The spline shaft 13 drives the spline cylinder 24 to rotate along the lifting frame 10. The spline cylinder 24 drives the crank 27 to rotate through the driving bevel gear 25 and the driven bevel gear 26. The crank 27 drives the drive frame 14 to move along the lifting frame 10 through the traction rod 28. The drive frame 14 drives the mesh frame 15 to slide along the striking frame 16, thereby driving the dust removal structure 17.

[0047] Furthermore, such as Figure 11As shown, the dust removal structure 17 includes a support block 32 fixedly connected to the striking frame 16. Multiple rotating rods 33, rotatably connected to the support block 32, are evenly distributed along the circumference of the support block 32. Each rotating rod 33 is fixedly connected to a dust removal hammer 36 for striking the cloth bag 4. Drive rods 31 are fixedly connected to the intersections of the horizontal and vertical rods of the mesh frame 15. The drive rods 31 are slidably connected to the support block 32. An mounting block 37 is fixedly connected to the drive rod 31. Multiple active rods 34, rotatably connected to the mounting block 37, are evenly distributed along the circumference of the mounting block 37. Extension rods 35 are fixedly connected to each of the multiple rotating rods 33. Each of the multiple active rods 34 is rotatably connected to a corresponding extension rod 35.

[0048] When the mesh frame 15 slides along the striking frame 16, the mesh frame 15 drives the drive rod 31 to slide along the support block 32. The drive rod 31 drives the active rod 34 to move through the mounting block 37. The active rod 34 drives the rotating rod 33 to rotate along the support block 32 through the extension rod 35. The rotating rod 33 strikes the filter bag 4 through the cleaning hammer 36 to achieve the cleaning operation of the filter bag 4.

[0049] like Figures 1 to 11 As shown below, the working process of the present invention will be explained in detail.

[0050] When this invention is used, the pretreatment cooling tower sprays atomized water for rapid cooling to avoid the formation of dioxins and reduces the flue gas temperature to 200-250℃, which is suitable for the subsequent working temperature of the bag filter.

[0051] Baghouse dust collector: Flue gas enters the dust collector body 1 through the inlet 3. Dust is intercepted on the outer surface by the filter bags 4. The purified gas passes through the filter bags 4 and is discharged through the outlet 5. The dust removal device 6 cleans the filter bags 4 periodically.

[0052] Dry desulfurization tower: The flue gas after dust removal enters the dry desulfurization tower. The flue gas comes into full contact with the calcium-based desulfurizing agent (such as Ca(OH)2) in the tower and undergoes a chemical reaction. The sulfur dioxide (SO2) in the flue gas is solidified and absorbed, generating calcium sulfate slag, which reduces the SO2 emission concentration to an ultra-low level (≤30mg / m³).

[0053] SCR desulfurization unit: Subsequently, the flue gas enters the SCR (Selective Catalytic Reduction) reactor; the system precisely injects ammonia water (NH3·H2O) as a reducing agent. Under the action of a special catalyst, the nitrogen oxides (NOx) in the flue gas react with ammonia to generate harmless nitrogen (N2) and water (H2O), thereby achieving deep denitrification (NOx≤100mg / m³).

[0054] Activated carbon adsorption tower: It performs final adsorption and purification of residual trace heavy metals, dioxins or VOCs, serving as "insurance" for achieving emission standards.

[0055] When cleaning the filter bag 4, the cleaning device 6 of the present invention starts the lifting motor 8, the drive motor 11, and intermittently starts the telescopic rod 18. The lifting motor 8 drives the lead screw 9 to rotate through the lifting bevel gear set. The lead screw 9 drives the lifting frame 10 to move up and down. The lifting frame 10 drives the striking frame 16 to move up and down, so that the cleaning structure 17 on the striking frame 16 can contact the filter bag 4 at various heights. The lifting frame 10 drives the drive frame 14 to move up and down through the traction structure.

[0056] Meanwhile, the drive motor 11 drives the spline shaft 13 to rotate through the drive bevel gear set 12, and the spline shaft 13 drives the spline cylinder 24 to rotate along the lifting frame 10; the spline cylinder 24 drives the crank 27 to rotate through the driving bevel gear 25 and the driven bevel gear 26, and the crank 27 drives the drive frame 14 to move along the lifting frame 10 through the traction rod 28, and the drive frame 14 drives the mesh frame 15 to slide along the striking frame 16; the mesh frame 15 drives the drive rod 31 to slide along the support block 32, and the drive rod 31 drives the drive rod 34 to move through the mounting block 37, and the drive rod 34 drives the rotating rod 33 to rotate along the support block 32 through the extension rod 35, and the rotating rod 33 strikes the filter bag 4 through the cleaning hammer 36 to realize the cleaning operation of the filter bag 4.

[0057] Additionally, after the striking hammer strikes the cloth bag 4, the striking hammer opens to its maximum position under the action of the rotating rod 33, activating the telescopic rod 18. The telescopic rod 18, through the slider 21 and the connecting frame 20, drives the synchronous frame 30 to move. The synchronous frame 30 drives the guide rod 29 to slide along the guide cylinder 23. The guide rod 29 drives the mesh frame 15 to move linearly, and the mesh frame 15 squeezes and shakes the cloth bag 4. At the same time, the mesh frame 15 drives the striking frame 16 to move linearly through the drive rod 31. The striking frame 16 drives the striking hammer on the dust removal structure 17 to squeeze and shake the cloth bag 4, thereby improving the dust removal effect of the dust removal device 6.

[0058] A process for preparing fracturing proppant ceramsite sand includes the following steps:

[0059] S1. The semi-finished ceramsite is fed into the rotary kiln. Inside the kiln, the semi-finished ceramsite is continuously lifted and scattered as the kiln rotates, forming a uniform material curtain, and slowly moving towards the kiln head. The semi-finished ceramsite is dried at 600°C-1050°C in the preheating section of the rotary kiln, sintered at 1050°C-1350°C in the sintering reaction zone of the rotary kiln, and finally calcined at 1300°C-1250°C in the heat treatment zone of the rotary kiln. After calcination, the finished ceramsite is obtained.

[0060] S2. The high-temperature flue gas generated by the rotary kiln is fed into the pretreatment cooling tower of the integrated waste gas treatment system made of fracturing proppant ceramsite sand. The waste gas is treated by a bag filter, a dry desulfurization tower, an SCR desulfurization unit, and an activated carbon adsorption tower. The treated flue gas is discharged through the chimney.

[0061] S3. The calcined ceramsite product from step S1 is sent into a cooling kiln to cool to room temperature.

[0062] S4. The cooled ceramsite product from step S2 is fed into a screening machine to screen out the ceramsite product of the required specifications.

[0063] Furthermore, the required specifications for step S4 are: 16 / 30 mesh, 20 / 40 mesh, 30 / 50 mesh, and 40 / 70 mesh, and the screening machine is preferably a multi-stage screening machine.

Claims

1. An integrated waste gas treatment system for fracturing proppant ceramsite sand preparation, characterized in that: The system includes a pretreatment cooling tower, a bag filter, a dry desulfurization tower, an SCR desulfurization unit, an activated carbon adsorption tower, and a chimney, which are connected in sequence through pipelines. The pretreatment cooling tower is connected to the high-temperature flue gas of the rotary kiln. The bag filter includes a dust collector body (1), an installation platform is fixed inside the dust collector body (1), and filter bags (4) are evenly distributed along the matrix on the installation platform. The dust collector body (1) is equipped with a dust removal device (6) for cleaning the filter bags (4). The dust removal device (6) includes multiple striking frames (16) arranged along the height direction of the cloth bag (4) and capable of synchronous linear and vertical lifting movements. A mesh frame (15) is slidably connected above each of the multiple striking frames (16). The vertical lifting of the striking frames (16) can drive the mesh frame (15) to lift up and down. The horizontal and vertical rods of the mesh frame (15) are respectively arranged between adjacent cloth bags (4). Dust removal structures (17) are evenly distributed on the striking frames (16). The dust removal structures (17) are located below the intersection of the horizontal and vertical rods of the mesh frame (15). The dust removal structures (17) slide up and down along the striking frames (16) with the mesh frame (15) to clean the cloth bag (4). The dust removal structures (17) and the mesh frame (15) squeeze and shake the cloth bag (4) with the linear movement of the striking frames (16). The dust collector body (1) has multiple lifting frames (10) with knocking frames (16) evenly distributed from top to bottom. The knocking frames (16) and the corresponding lifting frames (10) are slidably connected. The dust collector body (1) is provided with a lifting structure that drives the lifting frames (10) to move up and down. The dust collector body (1) has multiple driving frames (14) with mesh frames (15) evenly distributed from top to bottom. The mesh frames (15) and the driving frames (14) are slidably connected. The dust collector body (1) is provided with a traction structure that drives the driving frames (14) to slide along the lifting frames (10). A connecting rod (22) is provided between adjacent lifting frames (10) and adjacent drive frames (14). Adjacent lifting frames (10) are connected by corresponding connecting rods (22), and adjacent drive frames (14) are connected by corresponding connecting rods (22). A guide frame (19) is fixedly connected inside the dust collector body (1), and the connecting rod (22) is slidably connected to the guide frame (19). A guide cylinder (23) is fixedly connected to both the lifting frame (10) and the drive frame (14), and a guide rod (29) is slidably connected to the guide cylinder (23) on both the striking frame (16) and the mesh frame (15). A synchronous frame (30) is fixedly connected to the guide rod (29) of the mesh frame (15), and a vertically arranged connecting frame (20) is fixedly connected to each of the synchronous frames (30); a telescopic rod (18) is fixedly connected to the dust collector body (1), and a slider (21) that can slide vertically along the connecting frame (20) is fixedly connected to the telescopic end of the telescopic rod (18). The traction structure includes a drive motor (11) fixedly connected to the dust collector body (1), and a drive bevel gear set (12) connected to the output end of the drive motor (11); a spline shaft (13) is connected to the output end of the drive bevel gear set (12), and a spline cylinder (24) rotatably connected to the spline shaft (13) is slidably connected to the lifting frame (10); an active bevel gear (25) is fixedly connected to the spline cylinder (24), and a driven bevel gear (26) meshes with the active bevel gear (25); a crank (27) is connected to the driven bevel gear (26), and a traction rod (28) is rotatably connected to the crank (27), and the traction rod (28) is rotatably connected to the corresponding drive frame (14); The cleaning structure (17) includes a support block (32) fixedly connected to the striking frame (16). Multiple rotating rods (33) that are rotatably connected to the support block (32) are evenly distributed along the circumference of the support block (32). Each rotating rod (33) is fixedly connected to a cleaning hammer (36) for striking the cloth bag (4).

2. The integrated waste gas treatment system prepared from fracturing proppant ceramsite sand as described in claim 1, characterized in that: The lifting structure includes a lifting motor (8) fixedly connected to the dust collector body (1), and the output end of the lifting motor (8) is connected to a lifting bevel gear set; the output end of the lifting bevel gear set is connected to a lead screw (9), and one of the lifting frames (10) is screwed to the lead screw (9).

3. The integrated waste gas treatment system prepared from fracturing proppant ceramsite sand as described in claim 1, characterized in that: The intersections of the horizontal and vertical rods of the mesh frame (15) are all fixed with drive rods (31), and the drive rods (31) are slidably connected to the support block (32); the drive rods (31) are fixed with mounting blocks (37), and multiple active rods (34) that are rotatably connected to the mounting blocks (37) are evenly distributed along the circumference of the mounting blocks (37); multiple rotating rods (33) are all fixed with extension rods (35), and multiple active rods (34) are rotatably connected to the corresponding extension rods (35).

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