Flue gas purification device with waste gas waste heat utilization function

Abstract

The utility model relates to the technical field of electrolytic aluminum smoke exhaust purification, in particular to a smoke purification device with a waste gas waste heat utilization function, which comprises a gas inlet pipe, one end of the gas inlet pipe is inserted into the outer wall of one side of a filter box, an energy recovery box is arranged at the top of the filter box, and a heat exchange mechanism transversely penetrates through the left side and the right side of the energy recovery box. A washing box is arranged at the top of the energy recovery box, a spraying mechanism transversely penetrates through the inner walls of the left side and the right side of the washing box, an exhaust channel is formed in the top of the washing box, and an air conveying pipe is inserted in the position, under the spraying mechanism, of the outer wall of one side of the washing box. According to the improved flue gas purification device and the heat exchange mechanism, effective recovery and utilization of heat energy in waste gas are achieved, the influence of gas emission on the environment is reduced, the heat energy which is originally wasted is converted into useful energy, acid gas and other harmful substances in flue gas can be further removed through the spraying mechanism, the washing effect is enhanced, and the energy consumption is reduced. The removal efficiency of the acid gas is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electrolytic aluminum fume purification, in particular to a fume purification device with the function of waste heat utilization of waste gas. Background Technique

[0002] Electrolytic aluminum is a technology for extracting aluminum metal from aluminum ore by electrolysis. This process is mainly carried out in an electrolytic cell. First, the aluminum ore is converted into aluminum oxide, and then it is reduced to metallic aluminum by electrolysis. Electrolytic aluminum is an energy-intensive process that consumes a large amount of electricity. Therefore, electrolytic aluminum plants are usually built in areas with rich and low-cost power resources. The development and improvement of electrolytic aluminum technology, such as improving the design of electrolytic cells, increasing current efficiency, and reducing energy consumption, are crucial for improving the production efficiency of aluminum and reducing costs.

[0003] A fume purification device is a device used to remove pollutants in industrial exhaust fumes to reduce environmental pollution. Such devices play an important role in various industrial processes, such as power plants, steel plants, chemical plants, cement plants, etc. The fume purification device can effectively remove pollutants such as particulate matter, acidic gases, heavy metals, and nitrogen oxides in the fumes, and at the same time can also reduce air pollution, protect the environment and public health.

[0004] The inventor found the following problems in the process of realizing the utility model: 1. The existing fume purification device does not have the function of waste heat utilization of waste gas, so the heat energy contained in its gas will be wasted and cannot be reused; 2. The existing fume purification device often only washes the waste gas once to remove the acidic gas in it, so its washing effect is not strong enough, and the removal rate of acidic gas is not high enough. Content of the Utility Model

[0005] The purpose of the utility model is to provide a fume purification device with the function of waste heat utilization of waste gas to solve the problems mentioned in the above background technique that the existing fume purification device does not have the function of waste heat utilization of waste gas, so the heat energy contained in its gas will be wasted and cannot be reused, and the existing fume purification device often only washes the waste gas once to remove the acidic gas in it, so its washing effect is not strong enough, and the removal rate of acidic gas is not high enough. To achieve the above purpose, the utility model provides the following technical solution: A fume purification device with the function of waste heat utilization of waste gas, including an air inlet pipe, one end of the air inlet pipe is inserted into the outer wall of one side of a filtering box, a heat recovery box is arranged on the top of the filtering box, a heat exchange mechanism horizontally penetrates through the left and right sides of the heat recovery box, a washing box is arranged on the top of the heat recovery box, a spraying mechanism horizontally penetrates through the inner walls of the left and right sides of the washing box, an exhaust passage is arranged on the top of the washing box, and an air delivery pipe is inserted into the outer wall of one side of the washing box directly below the spraying mechanism.

[0006] Further preferably, a first air pump is provided on the outer wall of the intake pipe.

[0007] Further preferably, a first filter plate and a second filter plate are provided inside the filter box.

[0008] Further preferably, a breathable partition plate is provided at the top opening of the filter box.

[0009] Further preferably, the heat exchange mechanism is composed of a cooling pipe, a water pump, a water valve and a water storage tank. A water pump is provided on one side wall of the cooling pipe, and a water valve is provided on the other side wall. The water inlet end and the water outlet end of the cooling pipe are respectively inserted into the left and right outer walls of the water storage tank.

[0010] Further preferably, the spraying mechanism is composed of a spray head, a liquid suction pipe and a liquid suction pump. The liquid inlet end and the liquid outlet end of the liquid suction pipe are respectively inserted into the left and right outer walls of the washing box. The spray head is provided at the bottom of the liquid suction pipe, and the liquid suction pump is installed on one outer wall of the liquid suction pipe.

[0011] Further preferably, a metal filter screen is provided on the inner wall of the exhaust passage.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] In the present utility model, through heat exchange, the heat in the waste gas is transferred to the water in the cooling pipe, realizing the effective recovery and utilization of the heat energy in the waste gas, improving the energy efficiency of the whole system. Moreover, the heat exchange mechanism absorbs the heat in the gas, reducing the gas temperature and turning it into low-temperature gas, which also helps to reduce the environmental impact of gas emissions. At the same time, the hot water generated by heat exchange can be used for heating in industrial processes, domestic hot water supply or heating systems, thus converting the heat energy that would otherwise be wasted into useful energy.

[0014] In the present utility model, by spraying an alkaline solution with the spray head, the flue gas that has been preliminarily washed is washed a second time to further remove acidic gases and other harmful substances in the flue gas. This can increase the contact area and washing time of the flue gas, enhance the washing effect, and improve the removal efficiency of acidic gases. The effective secondary washing of the spraying mechanism helps to reduce the emission of harmful substances and the environmental impact of flue gas emissions. At the same time, the spraying mechanism can also improve the stability of the whole flue gas purification system, ensure that the flue gas emissions meet the environmental protection standards. A metal filter screen is provided on the inner wall of the exhaust passage, which can effectively intercept finer impurity particles in the gas, improve the purification quality of the flue gas, ensure that the gas discharged into the atmosphere meets the environmental protection standards, and reduce environmental pollution. Description of the Drawings

[0015] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0016] Figure 2 This is the front view sectional structure schematic diagram of the utility model.

[0017] Figure 3 This is the structure schematic diagram of the filter box of the utility model.

[0018] Figure 4 This is the structure schematic diagram of the heat exchange mechanism of the utility model.

[0019] Figure 5 This is the structure schematic diagram of the spraying mechanism of the utility model.

[0020] In the figure: 1. Air inlet pipe; 101. First air extraction pump; 2. Filter box; 201. First filter plate; 202. Second filter plate; 203. Permeable partition; 3. Energy recovery box; 4. Heat exchange mechanism; 401. Cooling pipe; 402. Water pump; 403. Water valve; 404. Water storage tank; 5. Washing box; 6. Spraying mechanism; 601. Sprinkler head; 602. Liquid extraction pipe; 603. Liquid extraction pump; 7. Exhaust passage; 701. Metal filter net; 8. Gas transmission pipe. Specific embodiments

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0022] Please refer to Figures 1 to 5 , the present utility model provides a technical solution: a flue gas purification device with the function of waste gas waste heat utilization, including an air inlet pipe 1, one end of the air inlet pipe 1 is inserted into the outer wall of one side of a filter box 2, a top of the filter box 2 is provided with an energy recovery box 3, a heat exchange mechanism 4 horizontally penetrates through the left and right sides of the energy recovery box 3, a top of the energy recovery box 3 is provided with a washing box 5, a spraying mechanism 6 horizontally penetrates through the inner walls of the left and right sides of the washing box 5, a top of the washing box 5 is provided with an exhaust passage 7, and a gas transmission pipe 8 is inserted into an outer wall of one side of the washing box 5 directly below the spraying mechanism 6.

[0023] In this embodiment, as Figure 1 and Figure 3As shown in the figure, a first air pump 101 is provided on the outer wall of the pipe body of the intake pipe 1. It should be noted that when an operator needs to use the flue gas purification device in the present utility model to purify the waste gas generated by electrolytic aluminum, the first air pump 101 can be started first to generate a suction force, and the waste gas generated during electrolytic aluminum is extracted into the interior of the intake pipe 1. At the same time, the first air pump 101 will push the waste gas and convey it to one side, so that the waste gas can enter the interior of the filter box 2 along the pipeline for filtering operations. During this period, the suction force generated by the first air pump 101 can ensure that the waste gas is effectively sucked into the intake pipe 1 from the source, improve the collection efficiency of the flue gas, and thus enhance the processing capacity of the entire purification device. At the same time, through the push of the first air pump 101, the flow direction and speed of the waste gas can be controlled to ensure that the flue gas evenly passes through the interior of the filter box 2 and sequentially passes through the first filter plate 201 and the second filter plate 202, thereby effectively completing the filtering operation of the waste gas.

[0024] In this embodiment, as Figure 2 and Figure 3 shown, a first filter plate 201 and a second filter plate 202 are provided inside the filter box 2. It should be noted that after the first air pump 101 inputs the waste gas from the intake pipe 1 into the interior of the filter box 2, the waste gas will first come into contact with and pass through the first filter plate 201 provided directly above it, removing the large particulate impurities contained therein. Then, it will pass upward through the filtration of the second filter plate 202, thereby filtering out the fine particles and harmful gases contained in the waste gas, and thus completing the multi-stage filtration of the waste gas. In actual application, the first filter plate 201 is usually designed as a coarse filtration layer for removing large particulate impurities in the waste gas. Preliminary filtration can reduce the load of the subsequent filtration layer and extend the service life of the entire filtration system. The second filter plate 202 serves as a fine filtration layer for removing the remaining fine particles and harmful gases in the waste gas. This fine filtration ensures the purification quality of the waste gas. Through multi-stage filtration, various particles and harmful substances in the waste gas can be removed more effectively, improving the filtration efficiency, so as to ensure that the waste gas generated by electrolytic aluminum meets the environmental protection standards before being discharged and reduce environmental pollution.

[0025] In this embodiment, as Figure 3As shown, a breathable partition 203 is provided at the top opening of the filtration box 2; it should be noted that when the waste gas inside the filtration box 2 passes through the multi-stage filtration of the first filter plate 201 and the second filter plate 202 in sequence, its gas will continue to flow upward until it reaches the breathable partition 203 provided at the top opening of the filtration box 2, and passes through the breathable holes opened on the surface of the breathable partition 203 and continues to flow upward into the energy recovery box 3 connected to the top end of the filtration box 2, so as to perform the heat exchange operation. During this period, the breathable partition 203 helps to evenly distribute the airflow entering the energy recovery box 3, improve the heat exchange efficiency, and the setting of the breathable partition 203 can provide a certain space for the heat exchange between the waste gas and the heat exchange mechanism 4, which helps to fully recover the heat of the waste gas. At the same time, the breathable partition 203 also enhances the stability and reliability of the system, which helps to achieve the efficient purification of waste gas and the effective recovery of waste heat.

[0026] In this embodiment, as Figure 4 shown, the heat exchange mechanism 4 is composed of a cooling pipe 401, a water pump 402, a water valve 403 and a water storage tank 404. Among them, a water pump 402 is provided on one side wall of the cooling pipe 401, and a water valve 403 is provided on the other side wall. The water inlet end and the water outlet end of the cooling pipe 401 are respectively inserted into the left and right outer walls of the water storage tank 404; it should be noted that when the filtered gas enters the energy recovery box 3, it will come into contact with the cooling pipe 401 provided inside it. At this time, because the cooling pipe 401 is filled with cooling water, its high-temperature gas will exchange heat with the cooling water in the cooling pipe 401, causing the cooling water in the cooling pipe 401 to heat up, while the temperature of its gas drops and turns into low-temperature gas. After the heat exchange is completed, the operator can open the water valve 403 and start the water pump 402 to pump the hot water in the cooling pipe 401 into the interior of the water storage tank 404, thus realizing the recovery of heat. In actual operation, through heat exchange, the heat in the waste gas is transferred to the water in the cooling pipe 401, realizing the effective recovery and utilization of the heat energy in the waste gas, improving the energy efficiency of the entire system, and the heat exchange mechanism 4 absorbs the heat in the gas, causing the gas temperature to drop and turn into low-temperature gas, which also helps to reduce the impact of gas emissions on the environment. At the same time, the hot water generated through heat exchange can be used for heating in industrial processes, domestic hot water supply or heating systems, thus converting the heat energy that would otherwise be wasted into useful energy.

[0027] In this embodiment, as Figure 5As shown in the figure, the spraying mechanism 6 is composed of a spray head 601, a liquid suction pipe 602 and a liquid suction pump 603. The liquid inlet end and the liquid outlet end of the liquid suction pipe 602 are respectively inserted into the left and right outer walls of the washing tank 5. The spray head 601 is arranged at the bottom of the liquid suction pipe 602, and the liquid suction pump 603 is installed on one outer wall of the liquid suction pipe 602. It should be noted that after the flue gas passes through the heat exchange mechanism 4 and is transformed into low-temperature gas, the gas will continue to rise and enter the lower end inside the washing tank 5 through the pipeline of the gas transmission pipe 8. At the same time, the gas will be mixed with the alkaline solution contained inside the washing tank 5, so as to remove the acidic gas contained in the gas. At the same time, the liquid will pass through the solution and travel upward to the spraying mechanism 6. At this time, the operator can start the liquid suction pump 603, so that the liquid suction pump 603 extracts the alkaline solution at the lower end inside the washing tank 5 into the pipeline through the liquid suction pipe 602, and makes it flow along the pipeline through the spray head 601 and then spray downward from the spray holes opened at the bottom of the spray head 601, so as to perform secondary washing with the upward flowing gas, and further remove harmful substances such as acidic gas contained in the gas. In actual use, by spraying the alkaline solution through the spray head 601 to perform secondary washing on the flue gas that has undergone preliminary washing, so as to further remove the acidic gas and other harmful substances in the flue gas, the contact area and washing time of the flue gas can be increased, the washing effect can be enhanced, and the removal efficiency of the acidic gas can be improved. The effective secondary washing of the spraying mechanism 6 helps to reduce the emission of harmful substances, reduce the impact of flue gas emission on the environment. At the same time, the spraying mechanism 6 can also improve the stability of the entire flue gas purification system and ensure that the flue gas emission meets the environmental protection standards.

[0028] In this embodiment, as Figure 5 shown, a metal filter screen 701 is provided on the inner wall of the exhaust passage 7. It should be noted that after the flue gas is washed through the washing tank 5 and the spraying mechanism 6 to remove the acidic gas contained in the flue gas, the filtered and purified gas will continue to rise and enter the exhaust passage 7. At this time, while the gas is flowing inside the exhaust passage 7, it will contact the metal filter screen 701 provided inside it, so as to further filter and intercept the fine impurity particles that may be missed and not removed in the gas, thereby ensuring the cleanliness of the discharged gas. In actual use, the metal filter screen 701 can effectively intercept finer impurity particles in the gas, improve the purification quality of the flue gas, ensure that the gas discharged into the atmosphere meets the environmental protection standards, reduce environmental pollution. At the same time, through the further filtration of the metal filter screen 701, the stable operation of the entire purification system is ensured and the operation safety is improved.

[0029] The usage method and advantages of the present utility model: When the flue gas purification device with the function of waste heat utilization of waste gas is in use, the working process is as follows:

[0030] As Figure 1 、 Figure 2 、Figure 3 , Figure 4 and Figure 5 As shown in Figure 3 , Figure 4 and Figure 5 , first, the operator can start the first air extraction pump 101 to generate suction force and extract the waste gas generated during electrolytic aluminum into the interior of the intake pipe 1. At the same time, the first air extraction pump 101 will push the waste gas and convey it to one side, so that the waste gas can enter the filter box 2 along the pipeline. Then, the waste gas will first come into contact with and pass through the first filter plate 201 located directly above it, removing the large particulate impurities contained therein. Then, it will pass upward through the filtration of the second filter plate 202, thereby filtering and removing the fine particles and harmful gases contained in the waste gas, and thus completing the multi-stage filtration of the waste gas. At this time, the gas will continue to flow upward until it reaches the breathable partition 203 provided at the top opening of the filter box 2 and passes through the breathable holes opened on the surface of the breathable partition 203 and continues to flow upward into the energy recovery box 3 connected to the top end of the filter box 2. At the same time, the gas comes into contact with the cooling pipe 401 provided inside the energy recovery box 3. Because the cooling pipe 401 is filled with cooling water, its high-temperature gas will exchange heat with the cooling water in the cooling pipe 401, causing the cooling water in the cooling pipe 401 to heat up, while the temperature of the gas drops and turns into low-temperature gas. After the heat exchange is completed, the operator can open the water valve 403 and start the water pump 402 to extract and convey the hot water in the cooling pipe 401 into the interior of the water storage tank 404, thus realizing the recovery of heat. The low-temperature gas will continue to rise and enter the lower end of the washing box 5 through the pipeline of the air delivery pipe 8. During this period, the gas will be mixed with the alkaline solution contained inside the washing box 5, thereby removing the acidic gas contained in the gas. At the same time, the liquid will pass through the solution and travel upward to reach the spraying mechanism 6. At this time, the operator can start the liquid extraction pump 603, so that the liquid extraction pump 603 extracts the alkaline solution at the lower end inside the washing box 5 into the pipeline through the liquid extraction pipe 602 and makes it flow along the pipeline through the nozzle 601 and then spray downward from the spray holes opened at the bottom of the nozzle 601, so as to perform secondary washing on the upward-flowing gas and further remove the harmful substances such as acidic gas contained in the gas. Finally, the filtered and purified gas will continue to rise and enter the exhaust passage 7. While the gas is flowing inside the exhaust passage 7 at this time, it will come into contact with the metal filter screen 701 provided inside it, thereby further filtering and intercepting the fine impurity particles that may be missed and not removed in the gas, and finally discharging them into the air.

[0031] The above has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present utility model and are not used to limit the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A flue gas purification device with waste heat utilization function of exhaust gas, comprising an intake pipe (1), characterized in that: One end of the intake pipe (1) is inserted into one side outer wall of the filtration box (2). A power recovery box (3) is provided at the top of the filtration box (2). A heat exchange mechanism (4) horizontally penetrates through the left and right sides of the power recovery box (3). A washing box (5) is provided at the top of the power recovery box (3). A spraying mechanism (6) horizontally penetrates through the left and right inner walls of the washing box (5). An exhaust passage (7) is provided at the top of the washing box (5). A gas transmission pipe (8) is inserted into one side outer wall of the washing box (5) directly below the spraying mechanism (6).

2. The flue gas purification device with waste heat utilization function according to claim 1, characterized in that: A first air pump (101) is provided on the outer wall of the pipe body of the intake pipe (1).

3. The flue gas purification device with waste heat utilization function according to claim 2, characterized in that: A first filter plate (201) and a second filter plate (202) are provided inside the filtration box (2).

4. The flue gas purification device with waste heat utilization function according to claim 1, wherein: A breathable partition plate (203) is provided at the top opening of the filtration box (2).

5. The flue gas purification device with waste heat utilization function according to claim 1, characterized in that: The heat exchange mechanism (4) is composed of a cooling pipe (401), a water pump (402), a water valve (403), and a water storage tank (404). A water pump (402) is provided on one side pipe wall of the cooling pipe (401), and a water valve (403) is provided on the other side pipe wall. The water inlet end and the water outlet end of the cooling pipe (401) are respectively inserted into the left and right side outer walls of the water storage tank (404).

6. The flue gas purification device with waste heat utilization function according to claim 1, characterized in that: The spraying mechanism (6) is composed of a spray head (601), a liquid suction pipe (602), and a liquid suction pump (603). The liquid inlet end and the liquid outlet end of the liquid suction pipe (602) are respectively inserted into the left and right side outer walls of the washing box (5). The spray head (601) is provided at the bottom of the liquid suction pipe (602), and the liquid suction pump (603) is installed on one side outer wall of the liquid suction pipe (602).

7. The flue gas purification device with waste heat utilization function according to claim 1, characterized in that: A metal filter screen (701) is provided on the inner wall of the exhaust passage (7).

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