A copper smelting flue gas desulfurization system

Abstract

The utility model discloses a copper smelting flue gas desulfurization system, including desulfurization absorption tower and regenerator, desulfurization absorption tower includes washing system, desulfurization system, desalination system, precipitate separation device and a plurality of connecting pipelines, washing system is equipped with washing tower, spray set A and filler layer A, desulfurization system is equipped with spray set B and filler layer B, and desalination system includes two stage filter separation device and ion exchange resin tank, spray set A and filler layer A are located inside washing tower, spray set B and filler layer B are located inside desulfurization absorption tower, washing tower, desulfurization absorption tower, regenerator, two stage filter separation device, ion exchange resin tank and precipitate separation device are connected in proper order through connecting pipeline, the utility model discloses through washing system high -efficient interception dust and acid aerosol, and desulfurization absorption tower removes SO2, and desalination system combines precipitate separation device and removes salt, avoids salt accumulation corrosion and blockage, ensures the long -term safe and stable operation of whole device and subsequent equipment.

Description

Technical Field

[0001] This utility model relates to the field of flue gas purification technology, specifically to a copper smelting flue gas desulfurization system. Background Technology

[0002] During copper smelting, a large amount of flue gas containing high concentrations of SO2 and various impurities is generated. This flue gas has a complex composition, often including heavy metal particles (such as lead and arsenic), gaseous mercury, fluorides, chlorides, and acidic aerosols such as sulfuric acid mist, in addition to sulfur dioxide. Soluble salts such as sodium sulfate and magnesium sulfate are also present. If this flue gas is emitted directly without effective treatment, it will not only cause serious pollution to the atmospheric environment, but also harm the surrounding ecology and the health of residents. Traditional desulfurization systems can effectively remove SO2 when treating flue gas, but they often fail to effectively remove various impurities, especially salts, resulting in poor desulfurization effect and potentially causing corrosion and blockage of downstream equipment. Utility Model Content

[0003] The purpose of this invention is to provide a copper smelting flue gas desulfurization system that efficiently removes SO2 and soluble salts, prevents equipment corrosion and blockage, achieves full recycling of amine and alkali solutions, and ensures long-term stable operation. This system aims to solve the technical problems of existing desulfurization systems, such as incomplete removal of complex impurities, salt accumulation leading to corrosion and blockage, and high operating costs.

[0004] To solve the above technical problems, the solution adopted by this utility model is as follows: A copper smelting flue gas desulfurization system includes a desulfurization absorption tower and a regeneration tower. The desulfurization absorption tower includes a scrubbing system, a desulfurization system, a desalination system, a precipitation separation device, and several connecting pipes. The scrubbing system includes a scrubbing tower, a spray device A, and a packing layer A. The desulfurization system includes a spray device B and a packing layer B. The desalination system includes a two-stage filtration separation device and an ion exchange resin tank. The spray device A and the packing layer A are installed inside the scrubbing tower from top to bottom. The spray device B and the packing layer B are installed inside the desulfurization absorption tower from top to bottom. The scrubbing tower, desulfurization absorption tower, regeneration tower, two-stage filtration separation device, ion exchange resin tank, and precipitation separation device are connected sequentially from left to right through the connecting pipes. After the high-temperature flue gas generated during copper smelting is cooled down, it is fed into the lower end of the scrubbing tower through a connecting pipe. The upper end of the scrubbing tower is connected to the lower end of the desulfurization absorption tower through a connecting pipe. The desulfurization absorption tower is connected to the regeneration tower through a connecting pipe. The regeneration tower is connected to the top of the two-stage filtration separation device and the ion exchange resin tank from left to right through a connecting pipe. The bottom end of the ion exchange resin tank is connected to the precipitation separation device through a connecting pipe. The precipitation separation device is connected to a solid waste treatment device. The packing material of the packing layer A, from bottom to top, consists of ceramic rectangular saddle rings, γ-type activated alumina, and sintered metal fiber felt. The packing material of the packing layer B is modified polytetrafluoroethylene (PTFE) structured packing. Spray device A sprays an alkaline solution, and spray device B sprays a lean amine solution. The ion exchange resin tank is a dual-bed design.

[0005] After the high-temperature flue gas generated during copper smelting is cooled, it is introduced into the scrubbing tower from the bottom through a connecting pipe. As the flue gas flows upward, it first passes through packing layer A for initial adsorption of larger impurities. Spray device A then sprays an alkaline solution to chemically neutralize the acidic gas. The dust-laden wastewater, after neutralizing the acidic gas, is fed into an external neutralization tank for further treatment and then recycled back to spray device A. The purified flue gas is then introduced into the desulfurization absorption tower from the bottom through a connecting pipe. Spray device B sprays lean amine solution. The packing layer B increases the contact area between the flue gas and the absorbent, improving desulfurization efficiency. During the spray desulfurization process, some impurities are also removed along with the absorption of SO2. The SO2-free flue gas is then discharged into the air. The lean amine solution, after absorbing SO2, is transformed into a rich amine solution and transported... The SO2 is transported to the regeneration tower via pipeline. Heated by low-pressure steam inside the tower, SO2 is purified through a desorption reaction and then transported to the acid production system for acid production. The SO2-free amine solution passes through a two-stage filtration and separation device to further remove small-molecule impurities, achieving efficient retention of sulfates. Simultaneously, the amine solution and useful substances are allowed to pass through, and the solution is then transported to the cation exchange resin tank to remove metal ions. After buffering, it enters the anion exchange tank to remove inorganic anions such as sulfides and chlorides for desalination. The desalinated amine solution then enters the precipitation separation device, where flocculants and other chemical agents are added to precipitate impurities. The precipitate is then separated from the supernatant. The bottom precipitate is transported to the solid waste treatment device for further processing, while the supernatant is recycled to the spray device B for reuse.

[0006] Furthermore, the spray device A is equipped with a storage tank A and an atomizing nozzle A; several atomizing nozzles A are provided, evenly distributed on the upper inner wall of the scrubbing tower; the storage tank A is located on one side of the scrubbing tower and connected to the atomizing nozzle A; the spray device B is equipped with a storage tank B and an atomizing nozzle B; several atomizing nozzles B are provided, evenly distributed on the upper inner wall of the desulfurization absorption tower; the storage tank B is located on one side of the desulfurization absorption tower and connected to the atomizing nozzle B.

[0007] Storage tank A stores alkaline solution. Atomizing nozzles A are evenly distributed at the bottom of the scrubbing tower to spray the atomized alkaline solution, ensuring the solution covers the interior of the scrubbing tower and fully contacts the rising flue gas. This removes dust that cannot be adsorbed by packing layer A by settling. Simultaneously, the liquid washes away impurities adsorbed inside packing layer A, preventing blockage. Storage tank B stores amine solution, which is sprayed through atomizing nozzles B onto packing layer B. As flue gas passes through packing layer B, it comes into contact with the amine solution on packing layer B to form a liquid film for desulfurization. Residual SO2 in the rising flue gas then comes into contact with the atomized amine solution for further desulfurization and purification.

[0008] Furthermore, the sedimentation separation device is a solid-liquid separation equipment centrifuge, and is equipped with a circulation pump and a circulation pipeline; one end of the circulation pipeline is connected to the solid-liquid separation equipment centrifuge, and the other end is connected to the liquid storage tank B; the circulation pump is fixedly installed in the middle of the circulation pipeline.

[0009] The centrifuge used in the solid-liquid separation equipment is a horizontal screw centrifuge. After the desalted amine liquid enters the centrifuge, flocculant is added and centrifuged. After centrifugation, the supernatant is pressurized by a circulation pump and circulated to storage tank B through a circulation pipeline as a supplementary liquid for the desulfurization absorbent (amine liquid) for recycling.

[0010] Furthermore, the desalination system is equipped with a lean amine storage tank and an amine liquid pressurizing pump; the two sides of the lean amine storage tank are connected to the regeneration tower and the two-stage filtration and separation device through the connecting pipes; the amine liquid pressurizing pump is fixedly installed in the middle of the connecting pipe connecting the lean amine storage tank and the two-stage filtration and separation device.

[0011] The lean amine solution produced by the regeneration tower flows by gravity into the lean amine storage tank for storage. It is then transported by an amine liquid pressurization pump. The first stage of the two-stage filtration and separation device uses a 20μm metal filter screen to remove particles ≥50μm and an activated carbon fiber felt to adsorb organic colloids, thereby filtering out small molecule impurities in the amine solution and achieving efficient retention of sulfate.

[0012] Furthermore, the scrubbing tower is made of corrosion-resistant fiberglass. The corrosion-resistant fiberglass material of the scrubbing tower allows it to withstand the corrosive characteristics of smelting flue gas.

[0013] The working principle of this utility model is as follows: After the high-temperature flue gas generated during copper smelting is cooled, it is introduced into the scrubbing tower from the bottom through a connecting pipe. As the flue gas flows upward, it first passes through packing layer A for preliminary adsorption of larger impurities. The atomizing nozzles A of spray device A spray alkaline solution from storage tank A into the interior of the scrubbing tower, chemically neutralizing acidic gases. The purified flue gas is then introduced into the desulfurization absorption tower from the bottom through a connecting pipe. The atomizing nozzles B of spray device B spray amine solution from storage tank B onto packing layer B. Packing layer B increases the contact area between the flue gas and the absorbent, improving desulfurization efficiency. During the spray desulfurization process, some impurities are also removed along with the absorption of SO2. The qualified flue gas after SO2 removal is discharged into the air. The lean amine solution after SO2 absorption is transformed into a rich amine solution and transported through a conveying pipeline. The SO2-free amine solution is sent to the regeneration tower and flows into the lean amine storage tank. It is then pressurized by an amine pressurization pump and filtered by a two-stage filtration and separation device to further remove small-molecule impurities from the amine solution, achieving efficient retention of sulfate. At the same time, the amine solution and useful substances are allowed to pass through and are transported to the cation exchange tank of the ion exchange resin tank to remove metal ions. After buffering, it enters the anion exchange tank to remove inorganic anions such as sulfides and chlorides for desalination. The desalinated amine solution enters the horizontal screw centrifuge of the precipitation separation device. By adding flocculants and other chemical agents, the impurities in the amine solution are precipitated and separated from the supernatant. The bottom precipitate is transported to the solid waste treatment device for treatment, while the supernatant is circulated through circulation pipes and circulation pumps to the storage tank B of the spray device for recycling.

[0014] The beneficial effects of this utility model are as follows: 1. This utility model efficiently intercepts dust, heavy metal particles and acidic aerosols through a washing system, removes SO2 through a desulfurization absorption tower, regenerates and recycles resources through a regeneration tower, and effectively removes salts such as sodium sulfate and metal ions through a desalination system combined with a precipitation separation device, avoiding salt accumulation, corrosion and blockage, and ensuring the long-term safe and stable operation of the entire device and subsequent equipment.

[0015] 2. This utility model enables the alkaline liquid and amine liquid to uniformly cover the packing layer in a micro-mist form by using storage tanks A and B and evenly distributed atomizing nozzles A and B. This effectively captures dust and washes the packing, eliminating the risk of blockage. The horizontal screw centrifuge circulates the amine liquid through a circulating pump, reducing resource waste. The lean amine storage tank and the pressure pump work together to steadily transport the regenerated amine liquid through a two-stage filtration and separation device to effectively remove SO2, heavy metals, and soluble salts. This makes the system stable in operation, low in maintenance costs, and has significant overall environmental benefits. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the system structure of this utility model; Figure 2 This is a schematic diagram of the cross-sectional structure of the system of this utility model; Figure 3 This is a flowchart illustrating the present invention.

[0017] In the diagram: 1. Desulfurization absorption tower; 2. Scrubbing system; 21. Scrubbing tower; 22. Spray device A; 23. Packing layer A; 24. Storage tank A; 25. Atomizing nozzle A; 3. Desulfurization system; 31. Spray device B; 32. Packing layer B; 33. Storage tank B; 34. Atomizing nozzle B; 4. Regeneration tower; 5. Desalination system; 51. Two-stage filtration and separation device; 52. Ion exchange resin tank; 53. Lean amine storage tank; 54. Amine liquid pressurization pump; 6. Precipitation separation device; 61. Circulation pump; 62. Circulation pipeline; 7. Connecting pipeline. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0020] The following is a detailed description of a copper smelting flue gas desulfurization system according to the present invention, with reference to the accompanying drawings: Example

[0021] A copper smelting flue gas desulfurization system includes a desulfurization absorption tower 1 and a regeneration tower 4. The desulfurization absorption tower 1 includes a scrubbing system 2, a desulfurization system 3, a desalination system 5, a sedimentation separation device 6, and eleven connecting pipes 7. The scrubbing system 2 is equipped with a scrubbing tower 21, a spray device A22, and a packing layer A23. The desulfurization system 3 is equipped with a spray device B31 and a packing layer B32. The desalination system 5 includes a two-stage filtration separation device 51 and an ion exchange resin tank 52. The spray device A22 and the packing layer A23 are installed from top to bottom inside the scrubbing tower 21. The spray device B31 and the packing layer B32 are installed from top to bottom inside the desulfurization absorption tower 1; the washing tower 21, the desulfurization absorption tower 1, the regeneration tower 4, the two-stage filtration and separation device 51, the ion exchange resin tank 52, and the precipitation separation device 6 are connected from left to right through the connecting pipe 7; the spray device A22 is equipped with a storage tank A24 and an atomizing nozzle A25; there are 10 atomizing nozzles A25, which are evenly distributed on the upper part of the inner wall of the washing tower 21; the storage tank A24 is located on one side of the washing tower 21 and is connected to the atomizing nozzles A25; The spraying device B31 is equipped with a storage tank B33 and atomizing nozzles B34; fifteen atomizing nozzles B34 are evenly distributed on the upper inner wall of the desulfurization absorption tower 1; the storage tank B33 is located on one side of the desulfurization absorption tower 1 and is connected to the atomizing nozzles B34; the sedimentation separation device 6 is a solid-liquid separation equipment centrifuge, and is equipped with a circulation pump 61 and a circulation pipeline 62; one end of the circulation pipeline 62 is connected to the solid-liquid separation equipment centrifuge, and the other end is connected to the storage tank B33; the circulation pump 61 is fixedly installed in the middle of the circulation pipeline 62; the desalination system 5 is equipped with a lean amine storage tank 53 and an amine liquid pressurizing pump 54; the lean amine storage tank 53 is connected to the regeneration tower 4 and the two-stage filtration separation device 51 on both sides through the connecting pipeline 7; the amine liquid pressurizing pump 54 is fixedly installed in the middle of the connecting pipeline 7 connecting the lean amine storage tank 53 and the two-stage filtration separation device 51; The washing tower 21 is made of corrosion-resistant fiberglass.

[0022] The working principle of this embodiment is as follows: After the high-temperature flue gas generated during copper smelting is cooled down, it is introduced into the scrubbing tower 21 from the bottom through connecting pipe 7. As the flue gas flows upward, it first passes through the packing layer A23 for preliminary adsorption of larger impurities. The atomizing nozzle A25 of the spray device A22 sprays the alkaline solution in the storage tank A24 into the interior of the scrubbing tower 21 to chemically neutralize the acidic gases. The purified flue gas is then introduced into the desulfurization absorption tower 1 from the bottom through connecting pipe 7. The atomizing nozzle B34 of the spray device B31 sprays the amine solution in the storage tank B33 onto the packing layer B32. The packing layer B32 increases the contact area between the flue gas and the absorbent, improving the desulfurization efficiency. During the spray desulfurization process, some impurities are also removed along with the absorption of SO2. The qualified flue gas after SO2 removal is discharged into the air. The lean amine solution after SO2 absorption is transformed into a rich amine solution and transported to the regeneration plant through the conveying pipe 7. In tower 4, SO2 gas is removed by high-temperature steam. The SO2-free amine solution flows into the lean amine storage tank 53, and is then pressurized by the amine liquid pressurization pump 54 and transported to the two-stage filtration separation device 51 for filtration. This further removes small-molecule impurities from the amine solution, achieving efficient retention of sulfates. At the same time, the amine solution and useful substances are allowed to pass through and are transported to the cation tank of the ion exchange resin tank 52 to remove metal ions. After buffering, it enters the anion tank to remove inorganic anions such as sulfides and chlorides for desalination. The desalinated amine solution enters the horizontal screw centrifuge of the precipitation separation device. Flocculants are added to cause impurities in the amine solution to precipitate. The precipitate is then separated from the supernatant by the horizontal screw centrifuge. The bottom precipitate is transported to an external solid waste treatment device for treatment, while the supernatant is circulated through the circulation pipe 62 and the circulation pump 61 to the storage tank B33 of the spray device B31 for recycling.

[0023] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A copper smelting flue gas desulfurization system, comprising a desulfurization absorption tower (1) and a regeneration tower (4), characterized in that: The desulfurization absorption tower (1) includes a washing system (2), a desulfurization system (3), a desalination system (5), a sedimentation separation device (6), and several connecting pipes (7); the washing system (2) is equipped with a washing tower (21), a spray device A (22), and a packing layer A (23); the desulfurization system (3) is equipped with a spray device B (31) and a packing layer B (32); the desalination system (5) includes a two-stage filtration separation device (51) and an ion exchange resin tank (52); the spray device A (22) and the packing layer A (23) are installed from top to bottom inside the washing tower (21); the spray device B (31) and the packing layer B (32) are installed from top to bottom inside the desulfurization absorption tower (1); the washing tower (21), the desulfurization absorption tower (1), the regeneration tower (4), the two-stage filtration separation device (51), the ion exchange resin tank (52), and the sedimentation separation device (6) are connected from left to right through the connecting pipes (7).

2. The copper smelting flue gas desulfurization system according to claim 1, characterized in that: The spray device A (22) is provided with a liquid storage tank A (24) and an atomizing nozzle A (25); there are several atomizing nozzles A (25), which are evenly distributed on the upper part of the inner wall of the washing tower (21); the liquid storage tank A (24) is located on one side of the washing tower (21) and is connected to the atomizing nozzle A (25); The spray device B (31) is provided with a storage tank B (33) and an atomizing nozzle B (34); there are several atomizing nozzles B (34), which are evenly distributed on the upper part of the inner wall of the desulfurization absorption tower (1); the storage tank B (33) is located on one side of the desulfurization absorption tower (1) and is connected to the atomizing nozzle B (34).

3. The copper smelting flue gas desulfurization system according to claim 2, characterized in that: The sedimentation separation device (6) is a centrifuge for solid-liquid separation and is equipped with a circulation pump (61) and a circulation pipeline (62); one end of the circulation pipeline (62) is connected to the centrifuge for solid-liquid separation and the other end is connected to the storage tank B (33); the circulation pump (61) is fixedly installed in the middle of the circulation pipeline (62).

4. The copper smelting flue gas desulfurization system according to claim 1, characterized in that: The desalination system (5) is equipped with a lean amine storage tank (53) and an amine liquid pressurizing pump (54); the lean amine storage tank (53) is connected to the regeneration tower (4) and the two-stage filtration and separation device (51) on both sides through the connecting pipe (7); the amine liquid pressurizing pump (54) is fixedly installed in the middle of the connecting pipe (7) connecting the lean amine storage tank (53) and the two-stage filtration and separation device (51).

5. A copper smelting flue gas desulfurization system according to claim 1, characterized in that: The washing tower (21) is made of corrosion-resistant fiberglass.

Images