Catalytic cracking regeneration flue gas denitration dust removal device
By designing a catalytic cracking regeneration flue gas denitrification and dust removal device with a horizontal spray liquid delivery pipe and a staggered baffle structure, the problems of pressure loss and uneven purification caused by the spray tower structure were solved, achieving efficient flue gas purification and dust collection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SINOCHEM HONGRUN PETROCHEMICAL CO LTD
- Filing Date
- 2025-04-21
- Publication Date
- 2026-05-29
AI Technical Summary
Existing catalytic cracking regeneration flue gas denitrification and dust removal devices suffer from high pressure loss and high fan energy consumption due to the structure of the spray tower, and the nitrogen oxide spray liquid falls too fast and unevenly, which affects the purification effect.
A denitrification and dust removal device for catalytic cracking regeneration flue gas is designed. It adopts a horizontal spray liquid delivery pipe and a staggered baffle structure, combined with an activated carbon filter and dust collection bag. The flue gas is treated by horizontal spray liquid, and the purification efficiency is improved by using a slow-speed channel and a backwashing system.
It reduces fan energy consumption, improves nitrogen oxide treatment efficiency and dust collection efficiency, reduces pressure loss within the device, and achieves stable flue gas flow and uniform purification.
Smart Images
Figure CN224292914U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of flue gas denitrification and dust removal devices, and in particular to a catalytic cracking regeneration flue gas denitrification and dust removal device. Background Technology
[0002] The catalytic cracking regeneration flue gas denitrification and dust removal unit is an environmentally friendly device used to treat the flue gas generated during the catalytic cracking process. Catalytic cracking is an important step in the petroleum refining process, which uses a catalyst to break down heavy oil into light oil and gas. However, this process generates a large amount of flue gas containing harmful substances such as nitrogen oxides (NOx) and particulate matter (dust), posing a threat to the environment and human health.
[0003] The main function of a catalytic cracking regeneration flue gas denitrification and dust removal device is to remove nitrogen oxides and particulate matter from the flue gas to meet environmental emission standards. For example, Chinese Patent Publication No. CN217939715U provides a catalytic cracking regeneration flue gas denitrification and dust removal device, including a chamber. A cooling component is located on the right side of the chamber, and a flushing component is located above the cooling component on the right side of the chamber. A disassembly assembly is located inside the chamber, including spring grooves on the front and rear sides of the chamber. Two spring rods, each with one end penetrating and extending into the chamber, are movably installed on the outside of the chamber. A stop is fixedly installed on the outer surface of each of the two spring rods, and a telescopic spring is movably installed on the outer surface of each of the two spring rods. The opposite sides of the two telescopic springs are fixedly installed against the opposite sides of the stop, and the opposite sides of the two telescopic springs are fixedly installed against the opposite sidewall of the inner cavity of the spring groove. This catalytic cracking regeneration flue gas denitrification and dust removal device, by incorporating the disassembly assembly, offers the advantage of convenient disassembly and assembly.
[0004] Currently, in flue gas dust removal, it is necessary not only to filter and discharge particulate matter, but also to treat severe nitrogen oxides. Conventional methods use a spray tower-like structure for purification. However, the structure of the spray tower requires the flue gas to flow from bottom to top, which requires overcoming gravity and results in a large pressure loss inside the tower. This not only increases the energy consumption of the fan, but may also affect the flow rate of the flue gas and the purification effect. Furthermore, the spray liquid used to treat nitrogen oxides is sprayed from top to bottom, which is also affected by gravity, causing the falling speed to be too fast and resulting in uneven coverage. Utility Model Content
[0005] The purpose of this invention is to address the aforementioned shortcomings in the existing technology by proposing a catalytic cracking regeneration flue gas denitrification and dust removal device.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] A catalytic cracking regeneration flue gas denitrification and dust removal device is designed, including a treatment cylinder. One end of the treatment cylinder is provided with an air inlet, which is fixed to the treatment cylinder by screws. Inside the treatment cylinder, a spray liquid conveying pipe is provided. The spray liquid conveying pipe is a circular structure with a port at its upper end. The port extends outward through the treatment cylinder. Several groups of spray liquid conveying pipes are arranged along the horizontal direction of the treatment cylinder. Spray liquid nozzles are provided through the inner wall of the spray liquid conveying pipe. The spray liquid nozzles are fixed to the spray liquid conveying pipe by welding. A second spray liquid conveying pipe is provided above the treatment cylinder. The second spray liquid conveying pipe has the same number of ports as the first spray liquid conveying pipe. The second ports are flanged to the first ports. The second ports are fixed to the spray liquid conveying pipe by welding. A feed pump is also provided above the treatment cylinder. The lower end of the outer wall of the feed pump is fixed to the surface of the treatment cylinder by a bracket. The feed end of the feed pump is flanged to the end of the second spray liquid conveying pipe.
[0008] The other end of the treatment cylinder is provided with an exhaust port. The connection between the exhaust port and the treatment cylinder is fixed by screws. The internal channel of the exhaust port is a rectangular channel. Several baffles are fixed in a staggered manner inside the rectangular channel. The other end of the exhaust port is flanged to a fan interface. A dust collection bag is embedded and fixed inside the fan interface. The dust collection bag is made of non-woven fabric.
[0009] In detail, an activated carbon filter is provided between two baffles near the treatment cylinder in the rectangular channel of the exhaust port, and gaps are left between several baffles and the treatment cylinder.
[0010] In detail, a backwashing port is provided through the upper end of the exhaust port. The connection between the backwashing port and the exhaust port is fixed by welding. A backwashing nozzle is fixedly installed at the lower end of the backwashing port. Multiple sets of backwashing nozzles are provided and correspond vertically to the position of the activated carbon filter.
[0011] In detail, a waste liquid inlet is provided through the lower end of the treatment cylinder, and the connection between the waste liquid inlet and the treatment cylinder is fixed by welding. A transition cylinder is provided at the lower end of the waste liquid inlet, and a discharge port is provided at the lower end of the transition cylinder.
[0012] In detail, the transition cylinder is equipped with a mesh plate inside, and the edge of the mesh plate is fixedly assembled to the inner wall of the transition cylinder by welding. The mesh plate is made of aluminum alloy wire mesh material.
[0013] In detail, the end of the waste liquid interface is provided with a through hole one, the two ends of the transition cylinder are provided with through holes two, and the end of the discharge interface is provided with through hole three. Through holes one, through holes two, and through holes three are corresponding to each other.
[0014] In detail, the same threaded rod runs through the interior of through hole one, through hole two, and through hole three located on the same vertical line. There are at least four threaded rods, which are arranged in a ring around the outside of the transition cylinder. A limit head is provided at the lower end of the threaded rod, and the limit head is set in close contact with the surface of the discharge interface.
[0015] In detail, the upper end of the threaded rod is threadedly connected to a threaded sleeve, which is tightly fitted to the surface of the waste liquid interface.
[0016] The design scheme proposed in this utility model has the following beneficial effects in application:
[0017] 1. When flue gas needs to be treated, the air enters the treatment cylinder through the inlet. The horizontal movement encounters less resistance compared to upward movement. A feed pump sprays external scrubbing liquid for treating nitrogen oxides in the flue gas. The flue gas is treated through the annularly distributed scrubbing nozzles. A fan is connected to the fan interface to guide the flue gas's movement. After being sprayed with the scrubbing liquid, the flue gas continues to move towards the fan interface, entering the exhaust interface and being discharged there. The exhaust interface contains staggered baffles, forming a slow-moving channel. Initially, the flue gas is filtered and purified by an activated carbon filter, further improving the treatment of nitrogen oxides. Finally, the flue gas enters the fan interface, where dust is collected by a dust collection bag, achieving dust removal.
[0018] 2. When the activated carbon filter is continuously filtering, dust will accumulate in the air intake area at the lower end. It is connected to an external clean water pipe through the backwash interface to supply clean water. The activated carbon filter can be rinsed through the backwash nozzle, which can also help to reduce dust with water mist.
[0019] 3. The waste liquid from the spray nozzles after treating nitrogen oxides and the waste liquid from the backwash nozzles after rinsing the activated carbon filter will be discharged through the waste liquid interface. The screen plate can filter impurities such as particulate dust, so that the waste liquid discharged from the discharge interface can be initially filtered. When it is necessary to clean the impurities on the screen plate regularly, rotate the threaded sleeve to separate it from the threaded rod. This allows the threaded rod to separate from the through hole one, through hole two, and through hole three in sequence, thereby removing the transition cylinder and cleaning the screen plate. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0021] Figure 2 This is a schematic diagram of the internal structure of the present invention;
[0022] Figure 3This is a schematic diagram of the shape of the spray liquid delivery pipe of this utility model;
[0023] Figure 4 This is a schematic diagram of the exhaust port and fan port structure of this utility model;
[0024] Figure 5 This is an enlarged schematic diagram of the waste liquid interface portion of this utility model.
[0025] In the diagram: 1. Processing cylinder; 11. Air inlet; 12. Spray liquid delivery pipe one; 13. Spray liquid nozzle; 14. Spray liquid delivery pipe two; 15. Material pump; 16. Exhaust port; 17. Baffle; 18. Fan port; 19. Dust collection bag; 2. Activated carbon filter; 21. Backwash nozzle; 22. Backwash port; 3. Waste liquid port; 31. Transition cylinder; 32. Discharge port; 33. Mesh plate; 34. Limiting head; 35. Threaded sleeve; 36. Threaded rod. Detailed Implementation
[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.
[0027] Reference Figures 1-5 A catalytic cracking regeneration flue gas denitrification and dust removal device includes a treatment cylinder 1. One end of the treatment cylinder 1 has an air inlet 11, which is fixed to the treatment cylinder 1 by screws. Inside the treatment cylinder 1 is a spray liquid delivery pipe 12, which has a circular structure and a port 1 at its upper end. The port 1 extends outward through the treatment cylinder 1. Several groups of spray liquid delivery pipes 12 are arranged horizontally along the treatment cylinder 1. Spray liquid nozzles 13 are installed through the inner wall of the spray liquid delivery pipe 12. The connection between 13 and the spray liquid conveying pipe 12 is fixed by welding. A second spray liquid conveying pipe 14 is provided above the treatment cylinder 1. The second spray liquid conveying pipe 14 is provided with the same number of ports as the first spray liquid conveying pipe 12. The second ports are flanged together with the first ports. The connection between the second ports and the second spray liquid conveying pipe 14 is fixed by welding. A material pump 15 is also provided above the treatment cylinder 1. The lower end of the outer wall of the material pump 15 is fixedly assembled to the surface of the treatment cylinder 1 by a bracket. The feed end of the material pump 15 is flanged together with the end of the second spray liquid conveying pipe 14.
[0028] The other end of the treatment cylinder 1 is provided with an exhaust port 16. The connection between the exhaust port 16 and the treatment cylinder 1 is fixed by screws. The internal channel of the exhaust port 16 is a rectangular channel. Several baffles 17 are fixed in a staggered manner in the rectangular channel. The flue gas exhaust deceleration channel formed between the baffles 17 can appropriately increase the path of flue gas movement, thereby achieving a deceleration effect. The other end of the exhaust port 16 is flanged to a fan port 18. A dust collection bag 19 is embedded and fixed inside the fan port 18. The dust collection bag 19 is made of non-woven fabric. The fan port 18 is connected to an external slow-speed fan. Through the effect of slow and gentle air extraction, the flue gas can be stably transported horizontally. Compared with bottom-up transportation, the suction force of the fan can be reduced, reducing the pressure abnormality in the treatment cylinder 1.
[0029] It should be further noted that an activated carbon filter 2 is provided between two baffles 17 near the treatment cylinder 1 in the rectangular channel of the exhaust port 16, and gaps are left between several baffles 17 and the treatment cylinder 1.
[0030] It should be further noted that a backwashing port 22 is provided through the upper end of the exhaust port 16. The connection between the backwashing port 22 and the exhaust port 16 is fixed by welding. A backwashing nozzle 21 is fixedly installed at the lower end of the backwashing port 22. Multiple sets of backwashing nozzles 21 are provided and correspond vertically to the position of the activated carbon filter 2. The backwashing nozzles 21 are equidistantly distributed along a straight line so that when spraying clean water, they can fully cover the activated carbon filter 2 through atomization.
[0031] It should be further explained that a waste liquid interface 3 is provided through the lower end of the treatment cylinder 1. The connection between the waste liquid interface 3 and the treatment cylinder 1 is fixed by welding. A transition cylinder 31 is provided at the lower end of the waste liquid interface 3. A discharge interface 32 is also provided at the lower end of the transition cylinder 31. The waste liquid interface 3 can play the role of waste liquid leakage. A valve can be connected to the lower end of the discharge interface 32, and the opening and closing of the discharge interface 32 can be set according to actual needs.
[0032] It should be further explained that a mesh plate 33 is provided inside the transition cylinder 31. The edge of the mesh plate 33 is fixedly assembled to the inner wall of the transition cylinder 31 by welding. The mesh plate 33 is made of aluminum alloy wire mesh material. The mesh plate 33 can filter impurities in the waste liquid and can perform preliminary filtration when the waste liquid is discharged.
[0033] It should be further explained that the end of the waste liquid interface 3 is provided with a through hole 1, the two ends of the transition cylinder 31 are provided with through holes 2, and the end of the discharge interface 32 is provided with through holes 3. The through holes 1, 2, and 3 are positioned in relation to each other. By cooperating with the threaded rod 36 through the through holes 1, 2, and 3, the waste liquid interface 3, the transition cylinder 31, and the discharge interface 32 can be quickly positioned and connected.
[0034] It should be further noted that the same threaded rod 36 runs through the interior of the through hole 1, through hole 2, and through hole 3 located on the same vertical line. There are at least four threaded rods 36, which are arranged in a ring around the outside of the transition cylinder 31. A limiting head 34 is provided at the lower end of the threaded rod 36. The limiting head 34 is closely attached to the surface of the discharge interface 32. The limiting head 34 can play a role in resisting and limiting, which can ensure the stable installation of the threaded rod 36.
[0035] It should be further explained that the upper end of the threaded rod 36 is threadedly connected to a threaded sleeve 35. The threaded sleeve 35 is tightly fitted to the surface of the waste liquid interface 3. When it is necessary to periodically clean the impurities on the screen plate 33, the threaded sleeve 35 is rotated to separate it from the threaded rod 36, so that the threaded rod 36 can be separated from the through hole one, through hole two and through hole three in sequence. Thus, the transition cylinder 31 can be removed to achieve cleaning of the screen plate 33.
[0036] Working method: When flue gas needs to be treated, it enters the treatment cylinder 1 through the inlet port 11. The horizontal movement is less obstructed than the upward movement. The feed pump 15 sprays out the external spray liquid for treating nitrogen oxides in the flue gas. The flue gas is treated through the ring-shaped spray liquid nozzles 13. The fan port 18 is connected to a fan to guide the movement path of the flue gas. After being sprayed by the spray liquid, the flue gas continues to move towards the fan port 18. During this process, it enters the exhaust port 16 and is discharged towards the fan port 18. The exhaust port 16 has staggered baffles 17. Multiple baffles 17 form a slow channel. When the flue gas first enters the slow channel, it can be treated and filtered by the activated carbon filter 2 to further improve the treatment of nitrogen oxides. Finally, the flue gas enters the fan port 18 and the dust is collected by the dust collection bag 19 to achieve the dust removal effect.
[0037] When the activated carbon filter 2 is continuously filtering, dust will adhere to the air intake area at the lower end. It is connected to an external clean water pipe through the backwash port 22 to deliver clean water. The activated carbon filter 2 can be rinsed through the backwash nozzle 21, which can also help to reduce dust with water mist.
[0038] The waste liquid from the spray nozzle 13 after treating nitrogen oxides and the waste liquid from the backwash nozzle 21 after rinsing the activated carbon filter 2 will be discharged through the waste liquid interface 3. The screen plate 33 can filter impurities such as particulate dust, so that the waste liquid discharged from the discharge interface 32 can be preliminarily filtered. When it is necessary to clean the impurities on the screen plate 33 regularly, rotate the threaded sleeve 35 to separate it from the threaded rod 36. The threaded rod 36 can then be separated from the through hole one, through hole two and through hole three in sequence. Thus, the transition cylinder 31 can be removed to clean the screen plate 33.
[0039] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A catalytic cracking regeneration flue gas denitrification and dust removal device, comprising a treatment cylinder (1), characterized in that: One end of the processing cylinder (1) is provided with an air inlet (11), and the connection between the air inlet (11) and the processing cylinder (1) is fixed by screws. Inside the processing cylinder (1) is a spray liquid delivery pipe (12), which is a ring structure with a port at its upper end. The port extends outward through the processing cylinder (1). Several groups of spray liquid delivery pipes (12) are arranged along the horizontal direction of the processing cylinder (1). Spray liquid nozzles (13) are installed through the inner ring wall of the spray liquid delivery pipes (12). The spray liquid nozzles (13) are connected to the spray liquid delivery pipes (12). The connection position of (12) is fixed by welding. A second spray liquid conveying pipe (14) is provided above the treatment cylinder (1). The second spray liquid conveying pipe (14) has the same number of ports as the first spray liquid conveying pipe (12). The second ports and the first ports are connected by flanges. The connection position of the second ports and the second spray liquid conveying pipe (14) is fixed by welding. A material pump (15) is also provided above the treatment cylinder (1). The lower end of the outer wall of the material pump (15) is fixedly assembled to the surface of the treatment cylinder (1) by a bracket. The feed end of the material pump (15) is connected to the end flange of the second spray liquid conveying pipe (14). The other end of the processing cylinder (1) is provided with an exhaust port (16). The connection between the exhaust port (16) and the processing cylinder (1) is fixed by screws. The internal channel of the exhaust port (16) is a rectangular channel. Several baffles (17) are fixed in the rectangular channel. The other end of the exhaust port (16) is flanged to a fan port (18). A dust collection bag (19) is embedded and fixed inside the fan port (18). The dust collection bag (19) is made of non-woven fabric.
2. The catalytic cracking regeneration flue gas denitrification and dust removal device according to claim 1, characterized in that: An activated carbon filter (2) is provided between two baffles (17) near the treatment cylinder (1) in the rectangular channel of the exhaust port (16), and a gap is left between several baffles (17) and the treatment cylinder (1).
3. The catalytic cracking regeneration flue gas denitrification and dust removal device according to claim 2, characterized in that: The upper end of the exhaust port (16) is provided with a backwash port (22). The connection between the backwash port (22) and the exhaust port (16) is fixed by welding. The lower end of the backwash port (22) is fixedly installed with a backwash nozzle (21). There are multiple sets of backwash nozzles (21), and they correspond vertically to the positions of the activated carbon filter (2).
4. The catalytic cracking regeneration flue gas denitrification and dust removal device according to claim 1, characterized in that: The lower end of the treatment cylinder (1) is provided with a waste liquid interface (3), and the connection between the waste liquid interface (3) and the treatment cylinder (1) is fixed by welding. The lower end of the waste liquid interface (3) is provided with a transition cylinder (31), and the lower end of the transition cylinder (31) is also provided with a discharge interface (32).
5. The catalytic cracking regeneration flue gas denitrification and dust removal device according to claim 4, characterized in that: The transition cylinder (31) is provided with a mesh plate (33) inside. The edge of the mesh plate (33) is fixedly assembled to the inner wall of the transition cylinder (31) by welding. The mesh plate (33) is made of aluminum alloy wire mesh material.
6. The catalytic cracking regeneration flue gas denitrification and dust removal device according to claim 5, characterized in that: The waste liquid interface (3) is provided with a through hole 1 at the end of the waste liquid interface (3), the two ends of the transition cylinder (31) are provided with through holes 2, and the end of the discharge interface (32) is provided with through holes 3. The through holes 1, 2 and 3 are in corresponding positions.
7. The catalytic cracking regeneration flue gas denitrification and dust removal device according to claim 6, characterized in that: The same threaded rod (36) runs through the interior of the through hole 1, through hole 2 and through hole 3 located on the same vertical line. There are at least four threaded rods (36), which are arranged in a ring around the outside of the transition cylinder (31). A limit head (34) is provided at the lower end of the threaded rod (36), and the limit head (34) is closely attached to the surface of the discharge interface (32).
8. The catalytic cracking regeneration flue gas denitrification and dust removal device according to claim 7, characterized in that: The upper end of the threaded rod (36) is threadedly connected to a threaded sleeve (35), and the threaded sleeve (35) is tightly fitted to the surface of the waste liquid interface (3).