Multistage purification treatment device for oxygen-enriched smelting tail gas

Abstract

The utility model discloses oxygen -enriched smelting tail gas multistage purification treatment device, including processing box and spiral pipe. Advantageous effect: the utility model discloses a spiral pipe and shower head have been used, when purifying and treating the lead -containing tail gas of oxygen -enriched smelting furnace, lead -containing tail gas enters the spiral pipe through the air inlet pipe, enters between the first baffle and the second baffle through the air outlet pipe, and the solid impurities in lead -containing tail gas are filtered by dust removal filter bag, and the tail gas containing lead ions enters the third baffle top through the connecting pipe, and is discharged from the exhaust pipe after pickling treatment, and the purification treatment is completed, when the tail gas passes through the spiral pipe, the water inlet pipe passes in cooling water, and the spiral pipe surface is sprayed through the shower head, and the high -temperature tail gas is cooled through low -temperature, avoids the service life of dust removal filter bag from being influenced by high -temperature tail gas, and further prolongs the service life of dust removal filter bag, simultaneously, the spiral pipe prolongs the moving path of high -temperature flue gas, and further improves the cooling effect.

Description

Technical Field

[0001] This utility model relates to the field of lead-containing tail gas treatment technology in oxygen-enriched smelting furnaces, specifically to a multi-stage purification treatment device for oxygen-enriched smelting tail gas. Background Technology

[0002] In the metallurgical industry, especially in the lead smelting process, oxygen-enriched furnaces are often used for smelting. When smelting lead, the exhaust gas produced by the oxygen-enriched furnace contains a large number of lead-containing solid particles and lead ions. In order to avoid lead pollution to the environment, the lead in the exhaust gas needs to be purified and removed when it is discharged.

[0003] Traditional purification equipment includes gravity settling devices, centrifugal separators, bag filters, and cyclone dust collectors, often combined with activated carbon adsorption and inert packing adsorption. However, when purifying lead-containing exhaust gas, directly introducing high-temperature flue gas into the bag filter can cause high-temperature damage to the filter bags. Prolonged operation affects the structural stability of the filter bags, impacting subsequent pulse cleaning and shortening their lifespan. Lead ions in the exhaust gas are difficult to capture and remove through adsorption and filtration, easily leading to excessive lead ion content in the discharged exhaust gas. Further improvements are needed.

[0004] There are currently no effective solutions to the problems in the relevant technologies. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a multi-stage purification treatment device for oxygen-enriched smelting tail gas, which has the advantages of extending service life and improving purification efficiency, thereby solving the problems mentioned in the background technology.

[0006] To achieve the aforementioned advantages of extended service life and improved purification efficiency, the specific technical solution adopted by this utility model is as follows: A multi-stage purification treatment device for oxygen-enriched smelting tail gas includes a treatment box and a spiral tube. Inside the treatment box, a first partition, a second partition, and a third partition are fixedly connected sequentially from bottom to top. A spiral tube is fixedly installed below the first partition inside the treatment box. A dust filter bag is fixedly connected through the surface of the second partition. A connecting pipe is connected through the surface of one side of the treatment box above the second partition, with the other end of the connecting pipe extending through to the top of the third partition. A water inlet pipe is fixedly mounted above the spiral tube below the first partition, with a spray head connected through its surface. A spray pipe is fixedly mounted above the third partition inside the treatment box, with an atomizing nozzle connected through its surface. An air inlet pipe is connected through one end of the spiral tube, and an air outlet pipe is connected through the other end of the spiral tube, with the other end of the air outlet extending through to the top of the first partition.

[0007] Furthermore, a backflush pipe is fixedly mounted between the second and third partitions, with one end of the backflush pipe extending into the venturi tube at the top opening of the dust collector filter bag.

[0008] Furthermore, the dust collector filter bags are arranged in multiple groups, and the dust collector filter bags are distributed at equal intervals, and a steel reinforcement frame is installed inside the dust collector filter bags.

[0009] Furthermore, the water inlet pipe penetrates the other side surface of the treatment tank and is connected to the cooling water pumping equipment. Multiple sets of the water inlet pipe are arranged, and multiple sets of spray heads are distributed at equal intervals along the length of the water inlet pipe.

[0010] Furthermore, the nozzle penetrates the other side surface of the treatment box and is connected to the dilute hydrochloric acid pumping equipment. Multiple sets of nozzles are arranged, and multiple sets of atomizing nozzles are distributed at equal intervals along the length of the nozzle.

[0011] Furthermore, a drain pipe is connected through the bottom surface of one side of the treatment box, and a liquid drain pipe is connected through the top surface of the other side of the treatment box above the third partition, and a valve is installed on the surface of the liquid drain pipe.

[0012] Furthermore, an exhaust pipe is connected through the top surface of the processing box.

[0013] Furthermore, the processing box has a cleaning door hinged to its front facade, and the cleaning door is a sealed door.

[0014] Compared with the prior art, this utility model provides a multi-stage purification treatment device for oxygen-enriched smelting tail gas, which has the following beneficial effects: (1) This utility model adopts a spiral tube and a spray head. When purifying the lead-containing tail gas of the oxygen-enriched smelting furnace, the lead-containing tail gas enters the spiral tube through the inlet pipe and enters the space between the first and second partitions through the outlet pipe. The solid impurities in the lead-containing tail gas are filtered by the dust removal filter bag. The tail gas containing lead ions enters the space above the third partition through the connecting pipe. After acid washing, it is discharged through the exhaust pipe to complete the purification treatment. When the tail gas passes through the spiral tube, cooling water is introduced through the water inlet pipe and sprayed on the surface of the spiral tube through the spray head. The high temperature tail gas is cooled by the low temperature, which avoids the high temperature tail gas from affecting the service life of the dust removal filter bag and thus extends the service life of the dust removal filter bag. At the same time, the spiral tube extends the movement path of the high temperature flue gas, thereby improving the cooling effect.

[0015] (2) This utility model adopts an atomizing nozzle. After the flue gas is filtered and cooled, it enters the upper part of the third partition. The nozzle is connected to dilute hydrochloric acid. The dilute hydrochloric acid is sprayed out through the atomizing nozzle to form dilute hydrochloric acid mist, which fully reacts with the lead ions in the exhaust gas to generate lead chloride solution. The lead ions in the exhaust gas are recovered and removed. The multi-stage exhaust gas treatment structure can not only remove solid lead dust, but also effectively remove non-solid lead ions. The lead removal efficiency in the exhaust gas is high. At the same time, lead ions can be recovered, reducing waste. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the internal structure of the multi-stage purification treatment device for oxygen-enriched smelting tail gas proposed in this utility model. Figure 2 This is a front view of the multi-stage purification treatment device for oxygen-enriched smelting tail gas proposed in this utility model. Figure 3 This is a schematic diagram of the external structure of the multi-stage purification treatment device for oxygen-enriched smelting tail gas proposed in this utility model. Figure 4 This is a top view of the spiral tube proposed in this utility model.

[0018] In the picture: 1. Processing box; 2. First partition; 3. Second partition; 4. Third partition; 5. Air inlet pipe; 6. Spiral pipe; 7. Air outlet pipe; 8. Water inlet pipe; 9. Spray head; 10. Drain pipe; 11. Dust filter bag; 12. Backflush pipe; 13. Connecting pipe; 14. Spray pipe; 15. Atomizing nozzle; 16. Drain pipe; 17. Exhaust pipe; 18. Cleaning door. Detailed Implementation

[0019] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0020] According to an embodiment of the present invention, a multi-stage purification treatment device for oxygen-enriched smelting tail gas is provided.

[0021] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. Please refer to them. Figure 1 and Figure 4 According to an embodiment of the present invention, the multi-stage purification treatment device for oxygen-enriched smelting tail gas includes a treatment box 1 and a spiral tube 6. The treatment box 1 is a vertical sealed metal box used to accommodate the purification components at each stage and provide tail gas treatment space. Inside the box, from bottom to top, a first partition 2, a second partition 3, and a third partition 4 are welded and fixedly connected. The first partition 2, the second partition 3, and the third partition 4 are all metal plates and are sealed to the inner wall of the treatment box 1 with sealant, dividing the interior of the treatment box 1 into three independent treatment areas, which respectively realize the functions of tail gas cooling, dust removal, and acid washing purification.

[0022] Below the first partition 2, inside the treatment chamber 1, a spiral tube 6 is fixedly installed via a bracket. The spiral tube 6 is made of high-temperature resistant metal tubing, capable of withstanding the high temperature of oxygen-enriched smelting exhaust gas. Its spiral structure extends the flow path of the exhaust gas within the tube. A dust collector filter bag 11 is threaded through the surface of the second partition 3 and fixedly connected with bolts. The dust collector filter bag 11 is a commonly used high-temperature resistant dust filtration component in industry, made of membrane filter material, and is a common dust removal structure that can effectively filter solid impurities in the exhaust gas.

[0023] Above the second partition 3, on one side of the treatment box 1, a connecting pipe 13 is connected via a flange. The connecting pipe 13 is a metal bend, and its other end extends to the top of the third partition 4, used to transport the exhaust gas after dust removal to the pickling area. Above the spiral tube 6, below the first partition 2, a water inlet pipe 8 is fixedly mounted on a bracket. The water inlet pipe 8 is a metal pipe, and its surface is connected to a spray head 9 via threads. The water outlet direction of the spray head 9 is vertically downward, which can evenly spray cooling water onto the surface of the spiral tube 6.

[0024] Above the third partition 4, inside the treatment box 1, a spray pipe 14 is fixedly mounted by a bracket. The spray pipe 14 is a corrosion-resistant metal pipe, and its surface is connected to an atomizing nozzle 15 by threads. The atomizing nozzle 15 sprays water vertically downwards, which can atomize dilute hydrochloric acid into fine droplets. One end of the spiral pipe 6 is connected to an air inlet pipe 5 through a flange. The air inlet pipe 5 is used to connect to the lead-containing tail gas generated by oxygen-enriched smelting. The other end of the spiral pipe 6 is connected to an air outlet pipe 7 through a flange. The other end of the air outlet pipe 7 extends upwards to above the first partition 2, and is used to transport the cooled tail gas to the dust removal area.

[0025] When purifying lead-containing exhaust gas from an oxygen-enriched smelting furnace, the exhaust gas first enters the spiral tube 6 through the inlet pipe 5. Simultaneously, the water inlet pipe 8 connects to a cooling water pump, and cooling water is delivered to each spray head 9 via the inlet pipe 8. The spray heads 9 evenly spray the cooling water onto the surface of the spiral tube 6, absorbing the heat from the high-temperature exhaust gas inside the spiral tube 6 through heat conduction, thus cooling the exhaust gas. The spiral structure of the spiral tube 6 extends the movement path of the high-temperature exhaust gas, allowing it to fully contact the cooled tube wall, further improving the cooling effect and preventing the high-temperature exhaust gas from directly entering subsequent areas and affecting the service life of the dust collector filter bag 11, thereby extending the service life of the dust collector filter bag 11.

[0026] The cooled exhaust gas enters the dust removal area between the first partition 2 and the second partition 3 through the exhaust pipe 7. The lead-containing exhaust gas flows upwards in this area. When it passes through the dust filter bag 11, solid lead dust and other impurities in the exhaust gas are trapped and filtered by the dust filter bag 11, and the filtered exhaust gas continues to flow upwards. Subsequently, the lead-containing exhaust gas enters the acid washing area above the third partition 4 through the connecting pipe 13. The nozzle 14 is connected to a dilute hydrochloric acid pump, and the dilute hydrochloric acid is delivered to each atomizing nozzle 15 through the nozzle 14. The atomizing nozzle 15 atomizes the dilute hydrochloric acid into a fine acid mist. The acid mist fully contacts and chemically reacts with the lead ions in the exhaust gas to generate a water-soluble lead chloride solution, thus achieving the removal and recovery of lead ions in the exhaust gas. The clean exhaust gas after acid washing is finally discharged through the exhaust pipe 17, completing the entire purification process.

[0027] Please refer to Figure 1 and Figure 2 A backflush pipe 12 is fixedly mounted between the second partition 3 and the third partition 4 via a bracket. The backflush pipe 12 is a metal pipe, with one end extending into the venturi tube at the top opening of the dust collector filter bag 11. A pulse valve is threaded onto the surface of the backflush pipe 12, and the other end is connected to a compressed air pump via a pipe. When excessive solid impurities adhere to the surface of the dust collector filter bag 11, causing a decrease in filtration efficiency, high-pressure gas generated by the compressed air pump is periodically injected into the dust collector filter bag 11 through the backflush pipe 12 and the pulse valve, causing the dust collector filter bag 11 to expand and vibrate instantaneously, shaking off the impurities adhering to the surface to the bottom between the first partition 2 and the second partition 3. This is a common backflush cleaning structure, which will not be described in detail here. This structure can effectively restore the filtration performance of the dust collector filter bag 11 and extend its service life.

[0028] Please refer to Figure 1Multiple sets of dust collector filter bags 11 are arranged according to the size of the treatment box 1 and the exhaust gas treatment volume. The dust collector filter bags 11 are evenly distributed on the surface of the second partition 3. This distribution method can expand the filtration and dust removal area, allowing the exhaust gas to pass through each dust collector filter bag 11 more evenly, avoiding excessive load on local filter bags, and improving the overall dust removal efficiency. In addition, a steel reinforcement frame is installed inside the dust collector filter bag 11. The steel reinforcement frame has a ring or spiral structure, which can support the dust collector filter bag 11 to keep it in an unfolded state and prevent the filter bag from being excessively deformed or collapsed during exhaust gas flow and backflushing. This is a common structure in the field.

[0029] Please refer to Figure 1 and Figure 2 One end of the water inlet pipe 8 penetrates the other side of the treatment tank 1 and is connected to the cooling water pumping equipment through a flange to ensure a continuous and stable supply of cooling water. Multiple sets of water inlet pipes 8 are arranged according to the distribution of the spiral tubes 6, with each set of water inlet pipes 8 corresponding to a section of the spiral tube 6. Multiple sets of spray heads 9 are evenly distributed along the length of the water inlet pipes 8. This design allows the cooling water to evenly cover the outer surface of the spiral tubes 6, avoiding inadequate cooling in localized areas, improving the uniformity of cooling and the efficiency of spray cooling, and ensuring a stable exhaust gas cooling effect.

[0030] Please refer to Figure 1 and Figure 2 One end of the nozzle 14 penetrates the other side of the treatment chamber 1 and is connected to the dilute hydrochloric acid pumping equipment via a flange, ensuring a continuous supply of dilute hydrochloric acid to the pickling area. Multiple sets of nozzles 14 are arranged according to the space above the third partition 4, and multiple sets of atomizing nozzles 15 are evenly distributed along the length of the nozzle 14. These multiple sets of atomizing nozzles 15 ensure that the dilute hydrochloric acid is atomized and evenly distributed within the pickling area, forming a dense acid mist field. After dust removal and cooling, the flue gas enters above the third partition 4 and can fully contact the acid mist, ensuring that the lead ions in the exhaust gas fully react with the dilute hydrochloric acid to generate lead chloride solution. This not only achieves efficient removal of lead ions from the exhaust gas but also allows for lead ion recovery, reducing resource waste. This multi-stage exhaust gas treatment structure removes solid lead dust first, then non-solid lead ions. Compared to a single treatment method, this results in higher lead removal efficiency and more thorough treatment of the exhaust gas.

[0031] Please refer to Figure 1 and Figure 2A drain pipe 10 is connected to the bottom surface of one side of the treatment tank 1 via a flange. The drain pipe 10 is used to discharge the wastewater generated after the spray cooling below the first partition 2, which facilitates the regular discharge and treatment of cooling wastewater by the staff and prevents the wastewater from accumulating at the bottom of the treatment tank 1. A drain pipe 16 is connected to the top surface of the other side of the treatment tank 1 via a flange above the third partition 4. The drain pipe 16 is used to discharge the lead chloride solution and residual dilute hydrochloric acid generated during the pickling process. A valve is installed on the surface of the drain pipe 16 via threads, which allows the staff to control the timing and speed of the discharge, facilitating the collection and subsequent treatment of the lead chloride solution.

[0032] Please refer to Figure 1 and Figure 3 The top surface of the treatment chamber 1 is connected to an exhaust pipe 17 via a flange. The exhaust pipe 17 is used to discharge the clean exhaust gas after acid washing treatment from the treatment chamber 1. To further ensure that the exhaust gas emissions meet the standards, the exhaust pipe 17 can be connected to a solid-liquid separation device, such as a demister, to remove any dilute hydrochloric acid droplets and lead chloride solution droplets that may be present in the exhaust gas. This prevents the dilute hydrochloric acid and lead chloride solution from being discharged into the air in an atomized state, causing secondary pollution and ensuring that the exhaust gas emissions meet environmental protection standards.

[0033] Please refer to Figure 1 and Figure 3 The front of the treatment box 1 is hinged with a cleaning door 18, which corresponds to the dust removal area between the first partition 2 and the second partition 3. The cleaning door 18 is a sealed door, and a sealing strip is provided between the door frame and the treatment box 1 to ensure the airtightness of the treatment box 1. When a large amount of lead-containing dust accumulates at the bottom of the dust removal area, the staff can open the cleaning door 18 to collect and clean the dust. The operation is convenient and quick, and it avoids the long-term accumulation of dust in the treatment box 1, which will affect the normal operation of the equipment.

[0034] Working principle: When purifying lead-containing exhaust gas from an oxygen-enriched smelting furnace, the cooling water pump and dilute hydrochloric acid pump are first started, while the lead-containing exhaust gas is simultaneously introduced into the spiral tube 6 through the inlet pipe 5. The cooling water pump delivers cooling water to the inlet pipe 8, which is then evenly sprayed onto the surface of the spiral tube 6 through the spray nozzles 9. The high-temperature exhaust gas inside the spiral tube 6 is cooled through heat conduction. The spiral structure of the spiral tube 6 extends the flow path of the exhaust gas, improving the cooling effect. The cooled exhaust gas then enters the dust removal area between the first baffle 2 and the second baffle 3 through the outlet pipe 7.

[0035] The exhaust gas flows upward within the dust removal area, passing through multiple sets of equally spaced dust filter bags 11. Solid lead dust in the exhaust gas is trapped by the filter bags, and the filtered exhaust gas enters the acid washing area above the third partition 4 through the connecting pipe 13. The dilute hydrochloric acid pumping equipment delivers dilute hydrochloric acid to the nozzle 14, which is atomized into acid mist by the atomizing nozzle 15. The acid mist reacts fully with the lead ions in the exhaust gas to generate lead chloride solution, thereby achieving the removal and recovery of lead ions.

[0036] The clean exhaust gas after acid washing is discharged through exhaust pipe 17. If further purification is required, exhaust pipe 17 can be connected to a solid-liquid separation device to remove residual droplets. When there is a lot of dust on the surface of the dust collector filter bag 11, the compressed air pump is started, and high-pressure gas is sprayed into the filter bag through the backflush pipe 12 and the pulse valve. The shaken dust accumulates at the bottom of the dust collection area, and the staff can periodically open the cleaning door 18 to clean the dust. The cooling wastewater below the first partition 2 is discharged through the drain pipe 10, and the lead chloride solution and residual dilute hydrochloric acid above the third partition 4 are discharged and collected through the drain pipe 16.

[0037] This oxygen-enriched smelting tail gas multi-stage purification treatment device, through a multi-stage treatment process of cooling, dust removal, and acid washing, can not only efficiently remove solid lead dust and non-solid lead ions from the tail gas, but also recover lead resources, reduce waste, and ensure the service life of equipment components, thus meeting the requirements of environmental protection and resource recycling.

[0038] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. 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 multi-stage purification treatment device for oxygen-enriched smelting tail gas, characterized in that, The assembly includes a processing box (1) and a spiral tube (6). Inside the processing box (1), a first partition (2), a second partition (3), and a third partition (4) are fixedly connected from bottom to top. The spiral tube (6) is fixedly installed below the first partition (2) inside the processing box (1). A dust filter bag (11) is fixedly connected through the surface of the second partition (3). A connecting pipe (13) is connected through the surface of the second partition (3) on one side of the processing box (1), and the other end of the connecting pipe (13) extends through to the third partition (4). In this case, a water inlet pipe (8) is fixedly mounted above the spiral tube (6) below the first partition (2), and a spray head (9) is connected through the surface of the water inlet pipe (8). A spray pipe (14) is fixedly mounted above the third partition (4) inside the treatment box (1), and an atomizing nozzle (15) is connected through the surface of the spray pipe (14). An air inlet pipe (5) is connected through one end of the spiral tube (6), and an air outlet pipe (7) is connected through the other end of the spiral tube (6), and the other end of the air outlet pipe (7) extends to the top of the first partition (2).

2. The multi-stage purification treatment device for oxygen-enriched smelting tail gas according to claim 1, characterized in that, A backflush pipe (12) is fixedly mounted between the second partition (3) and the third partition (4), and one end of the backflush pipe (12) extends into the venturi tube at the top opening of the dust filter bag (11).

3. The multi-stage purification treatment device for oxygen-enriched smelting tail gas according to claim 1, characterized in that, The dust collector filter bags (11) are arranged in multiple sets, and the dust collector filter bags (11) are distributed at equal intervals, and a steel frame is installed inside the dust collector filter bags (11).

4. The multi-stage purification treatment device for oxygen-enriched smelting tail gas according to claim 1, characterized in that, The water inlet pipe (8) passes through the other side of the treatment box (1) and is connected to the cooling water pumping equipment. Multiple sets of the water inlet pipe (8) are arranged, and multiple sets of the spray heads (9) are distributed at equal intervals along the length of the water inlet pipe (8).

5. The multi-stage purification treatment device for oxygen-enriched smelting tail gas according to claim 1, characterized in that, The nozzle (14) penetrates the other side of the treatment box (1) and is connected to the dilute hydrochloric acid pumping equipment. Multiple sets of nozzles (14) are arranged, and multiple sets of atomizing nozzles (15) are distributed at equal intervals along the length of the nozzle (14).

6. The multi-stage purification treatment device for oxygen-enriched smelting tail gas according to claim 1, characterized in that, A drain pipe (10) is connected to the bottom surface of one side of the treatment box (1), and a drain pipe (16) is connected to the top surface of the other side of the treatment box (1) above the third partition (4), and a valve is installed on the surface of the drain pipe (16).

7. The multi-stage purification treatment device for oxygen-enriched smelting tail gas according to claim 1, characterized in that, The top surface of the processing box (1) is connected to an exhaust pipe (17).

8. The multi-stage purification treatment device for oxygen-enriched smelting tail gas according to claim 1, characterized in that, The processing box (1) has a cleaning door (18) hinged to its front facade, and the cleaning door (18) is a sealed door.

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