A reflux-type environmentally friendly dust removal equipment

Abstract

A recirculation-type environmentally friendly dust removal device includes a gas collection hood for collecting waste gas, a filtration system unit for filtering the waste gas, a filter fan for providing filtration power to the filtration system unit, an exhaust pipe for discharging filtered gas to the outside, and a recirculation pipe for returning the filtered gas back to the gas collection hood. The inlet end of the recirculation pipe is connected to the outlet end of the filter fan or the interior of the exhaust pipe. The filtered waste gas delivered by the filter fan is split between the exhaust pipe and the recirculation pipe. The exhaust pipe discharges a small portion of the filtered gas to the outside, while the remaining filtered gas is returned to the gas collection hood for further filtration via the recirculation pipe. This structure reduces the amount of filtered gas discharged to the outside by the dust removal device, thereby achieving a low-emission effect for the environmentally friendly dust removal device, effectively reducing air pollution to the outside environment, and meeting the user's environmental protection requirements.

Description

Technical Field

[0001] This invention relates to the field of environmental protection dust removal equipment technology, specifically to a recirculation type environmental protection dust removal equipment. Background Technology

[0002] As technology advances at an increasingly rapid pace and various industries continue to grow and expand, environmental problems are gradually emerging. For example, the metal smelting process often produces waste gas containing a lot of dust. If the harmful substances in this dust are not treated and are directly emitted into the air, it will cause environmental pollution. Therefore, dust removal equipment is needed to remove the dust before it can be emitted into the atmosphere or further treated.

[0003] For example, according to Chinese patent CN204745977U, existing dust removal equipment combines different dust collectors to improve dust removal efficiency. For instance, a cyclone dust collector and a bag filter are connected in series. During dust removal and filtration, the fan uses a collection hood to draw exhaust gas into the cyclone dust collector, where the cyclone separator removes most of the coarse particles. The exhaust gas then enters the bag filter for secondary filtration, separating most of the small particles. Finally, the exhaust gas is directly discharged through an exhaust pipe connected to the fan. This type of dust removal equipment can filter out most of the dust particles in the exhaust gas, ensuring that the discharged gas meets environmental emission standards.

[0004] The gases emitted by this type of dust removal equipment meet the requirements of environmental emission standards. However, when users want to further reduce the pollution of the outside atmosphere caused by the gases emitted by the dust removal equipment, the manufacturers usually modify the cyclone dust collector and / or bag dust collector. For example, they may add cyclone dust collectors and / or bag dust collectors to the existing equipment to improve filtration efficiency. This method of improving filtration efficiency has high modification costs and equipment operating costs, which is not conducive to cost control. In addition, even the dust removal equipment newly produced by the manufacturers consists of multiple cyclone dust collectors and bag dust collectors, which also have high equipment production and operating costs. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention provides a reflux-type environmentally friendly dust removal device.

[0006] The technical solution adopted by this invention to solve its technical problem is:

[0007] A recirculation-type environmentally friendly dust removal device includes a gas collection hood for collecting waste gas, a filtration system unit for filtering waste gas, a filter fan for providing filtration power to the filtration system unit, and an exhaust pipe for discharging filtered gas to the outside. The inlet end of the filtration system unit is connected to the gas collection hood, and the outlet end is connected to the inlet end of the filter fan. One end of the exhaust pipe is connected to the outlet end of the filter fan, and the other end is provided with an exhaust port. The device is characterized by further including a recirculation pipe for sending the filtered gas back into the gas collection hood. The inlet end of the recirculation pipe is connected to the outlet end of the filter fan or the interior of the exhaust pipe, and the outlet end is connected to the interior of the gas collection hood.

[0008] In this invention, the air inlet of the return pipe is connected to the exhaust pipe via an air guide pipe section. The lower end of the air guide pipe section is connected to the exhaust pipe, and the upper end is inclined upward and connected to the air inlet of the return pipe.

[0009] In this invention, the exhaust pipe is also provided with a regulating valve for adjusting the exhaust flow rate of the exhaust port. By using the regulating valve to reduce the exhaust flow rate of the exhaust port, the amount of exhaust gas emitted can be effectively adjusted and reduced.

[0010] In this invention, the regulating valve includes a servo motor, a gearbox driven by the servo motor, and a valve plate controlled by the gearbox. The gearbox is installed on the exhaust pipe, and the valve plate is rotatably installed on the exhaust pipe. The valve plate is used to close or open the exhaust port of the exhaust pipe.

[0011] In this invention, the outlet end of the return pipe is provided with an air inlet pipe for sending the filtered gas into the gas collection hood, and the air inlet pipe is provided with an air inlet for sending the filtered gas into the gas collection hood.

[0012] In this invention, there are two air inlet ducts, which are arranged at intervals.

[0013] In this invention, the length direction of the air inlet extends from top to bottom on the air inlet duct.

[0014] In this invention, the gas collecting hood is provided with a smoke hood opening, and the airflow ejected from the air inlet forms an air curtain that blocks the smoke hood opening.

[0015] In this invention, the filtration system unit includes a cyclone separator and a bag filter. The air inlet of the cyclone separator is provided with a first pipe that communicates with the smoke outlet of the gas collection hood, and the air outlet is provided with a second pipe that communicates with the air inlet of the bag filter. The air outlet of the bag filter is provided with a third pipe that communicates with the air inlet of the filter fan.

[0016] The beneficial effects of this invention are:

[0017] 1. This invention is equipped with an exhaust pipe and a return pipe. The filtered exhaust gas sent by the filter fan is divided by the exhaust pipe and the return pipe. The exhaust pipe can discharge a small portion of the filtered gas to the outside, while the remaining filtered gas is sent back to the gas collection hood for further filtration through the return pipe. This structure can reduce the amount of filtered gas discharged to the outside by the dust removal equipment. By reducing the amount of filtered gas discharged to the outside by the dust removal equipment, the low emission effect of the environmentally friendly dust removal equipment is achieved, effectively reducing pollution to the outside air and meeting the environmental protection requirements of users.

[0018] 2. After partial filtration, the gas returns to the gas collection hood and can be filtered again by the filtration system unit, which can further improve the filtration effect and quality of the air.

[0019] 3. Moreover, when the filtered gas returns to the fume hood opening, it becomes an air curtain, effectively blocking the exhaust gas generated by the equipment inside the gas collection hood, reducing the chance of exhaust gas flowing out of the fume hood opening, thereby ensuring the filtration effect of the environmental protection equipment.

[0020] 4. The structure of the present invention is simple and reasonable. Manufacturers of dust removal equipment only need to add a return pipe to the existing dust removal equipment to reduce the pollution of the dust removal equipment to the outside air. It is convenient for both production and modification. Moreover, this method of adding a return pipe is less expensive than adding a cyclone dust collector or / and a bag dust collector. It can meet the user's environmental protection requirements while reducing the user's cost of using dust removal equipment.

[0021] 5. This invention is equipped with an air valve, which can adjust the exhaust flow rate of the exhaust port of the exhaust pipe, allowing users to freely adjust the amount of filtered gas discharged from the dust removal equipment to meet the user's environmental protection requirements. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0023] Figure 1 This is the front view of this embodiment;

[0024] Figure 2 This is a top view of this embodiment;

[0025] Figure 3 This is a schematic diagram of the installation structure of the control valve;

[0026] Figure 4 Schematic diagram of the combination of air inlet duct and air collection hood Figure 1 ;

[0027] Figure 5 Schematic diagram of the combination of air inlet duct and air collection hood Figure 2 ;

[0028] Figure 6 Schematic diagram of the combination of air inlet duct and air collection hood Figure 3 ;

[0029] Figure 7 This is the front view of the cooler;

[0030] Figure 8 This is a top view of the cooler. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0032] In the description of the invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of the invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, including welding, riveting, bonding, etc.; it can also be a detachable connection, including threaded connection, key connection, pin connection, etc.; 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. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] In the description of the invention, it should be noted that, unless otherwise explicitly specified and limited, the exhaust pipe, return pipe, first pipe, second pipe, and third pipe should be interpreted broadly. They may consist of a single duct or multiple ducts connected together. Example

[0035] Reference Figure 1-6A recirculation-type environmentally friendly dust removal device includes a gas collection hood 1 for collecting waste gas, a filtration system unit for filtering waste gas, a filter fan 2 for providing filtration power to the filtration system unit, an exhaust pipe 3 for discharging filtered gas to the outside, and a recirculation pipe 4 for returning the filtered gas back to the gas collection hood 1. The inlet end of the filtration system unit is connected to the gas collection hood 1, and the outlet end is connected to the inlet end of the filter fan 2. One end of the exhaust pipe 3 is connected to the outlet end of the filter fan 2, and the other end is provided with an exhaust port. Furthermore, the inlet end of the recirculation pipe 4 is connected to the outlet end of the filter fan 2 or the interior of the exhaust pipe 3, and the outlet end is connected to the interior of the gas collection hood 1. Thus, a portion of the filtered gas output by the filter fan 2 is discharged outward through the exhaust port of the exhaust pipe 3, while the filtered gas that does not exit through the exhaust port is returned to the gas collection hood 1 by the recirculation pipe 4 and undergoes filtration and purification again through the filtration system unit, thereby effectively improving the filtration quality.

[0036] In a preferred embodiment, one end of the exhaust pipe 3 is provided with an air inlet connecting to the outlet of the filter fan 2, and the other end is provided with an exhaust port. A return port is provided on the exhaust pipe 3 between the air inlet and the exhaust port. The air inlet of the return pipe 4 is connected to the interior of the exhaust pipe 3 through the return port. The return port is not shown in the accompanying drawings. In this embodiment, the air inlet of the return pipe 4 is connected to the exhaust pipe 3 via a guide pipe section 10. The lower end of the guide pipe section 10 is connected to the exhaust pipe 3 and correspondingly connected to the return port, while the upper end is inclined upwards and connected to the air inlet of the return pipe 4. Further, the guide pipe section 10 can be fixedly connected to the exhaust pipe 3 or fixedly connected to the air inlet of the return pipe 4; preferably, the guide pipe section 10 is fixedly connected to the exhaust pipe 3.

[0037] In a preferred embodiment, to control the exhaust flow rate of the exhaust port, the exhaust pipe 3 is also equipped with a regulating valve 5 for adjusting the exhaust flow rate. Workers can use the regulating valve 5 to adjust the flow rate of the filtered gas discharged from the exhaust port. After adjusting the exhaust flow rate of the exhaust port using the regulating valve 5, the flow rate of the filtered gas transported through the return pipe 4 is also adjusted, thereby achieving the regulation of the transport flow rate in the return pipe 4. When the worker reduces the exhaust flow rate of the exhaust port using the regulating valve 5, the air supply flow rate of the return pipe 4 increases, allowing more filtered gas to return to the gas collection hood 1 through the return pipe 4 for further filtration, thus reducing the air pollution caused by the dust removal equipment.

[0038] In this embodiment, the regulating valve 5 is an electric air valve. The regulating valve 5 includes a servo motor 51, a reduction gearbox 52 driven by the servo motor 51, and a valve plate 53 controlled by the reduction gearbox 52. The reduction gearbox 52 is installed on the exhaust pipe 3, and the valve plate 53 is rotatably installed on the exhaust pipe 3. The valve plate 53 is used to close or open the exhaust port of the exhaust pipe 3. Electric air valves are prior art and therefore will not be described in detail.

[0039] In this embodiment, the gas collection hood 1 is provided with a fume hood opening 11, which is located on one side of the gas collection hood 1. The fume hood opening 11 is used for workers to feed materials into the furnace 100, and can also allow external air to enter the gas collection hood 1. Furthermore, the gas collection hood 1 is provided with a smoke outlet 12 for sending exhaust gas to the filtration system unit. The smoke outlet 12 is located at the top center of the gas collection hood 1, and the air inlet of the filtration system unit is connected to the smoke outlet 12.

[0040] In a preferred embodiment, to ensure that the gas transported by the return pipe 4 can smoothly return to the gas collection hood 1, the outlet end of the return pipe 4 is provided with an air inlet pipe 6 for sending the filtered gas into the gas collection hood 1. The air inlet pipe 6 is provided with an air inlet 61 for sending the filtered gas into the gas collection hood 1, so that the gas transported by the return pipe 4 can return into the gas collection hood 1. In addition, the airflow ejected from the air inlet 61 forms an air curtain that blocks the smoke hood opening 11. By blocking the smoke hood opening 11 through the action of the air curtain, the exhaust gas is effectively blocked inside the gas collection hood 1, reducing the probability of exhaust gas flowing out of the smoke hood opening 11, thereby ensuring the filtration effect of the environmental protection equipment.

[0041] In this embodiment, there are two air inlet pipes 6, which are arranged at intervals. By using the two air inlet pipes 6 to deliver filtered gas into the gas collection hood 1, the efficiency of gas delivery in the return pipe 4 can be improved.

[0042] In this embodiment, the air inlet 61 is a rectangular or oblong hole, and its length extends from top to bottom along the air inlet pipe 6. In this embodiment, the air inlet pipe 6 is located at the fume hood opening 11; for example, two air inlet pipes 6 are respectively located on the left and right sides of the fume hood opening 11. The air outlet direction of the air inlet 61 is inclined towards the central area of ​​the fume hood 1. For example, in this embodiment, the smoke outlet 12 is located at the top center of the fume hood 1, and the central area inside the fume hood 1 is the area directly below the smoke outlet 12. In this case, the air inlet 61, with its air outlet direction inclined towards the central area inside the fume hood 1, allows the gas to flow directly to the central area below the smoke outlet 12, mix with the exhaust gas inside the fume hood 1, and then enter the filtration system unit through the smoke outlet 12.

[0043] In a preferred embodiment, a distribution pipe 50 is provided at the outlet end of the return pipe 4, and the inlet pipe 6 is connected to the distribution pipe 50. The inlet pipe 6 is connected to the outlet end of the return pipe 4 through the distribution pipe 50. The distribution pipe 50 is used to distribute the filtered gas to the inlet pipe 6. In addition, if necessary, an air inlet for inputting filtered gas into the gas collection hood 1 can also be provided on the distribution pipe 50, which can also serve to supply gas to the gas collection hood 1, so that the filtered gas can quickly enter the gas collection hood 1. At the same time, the filtered gas returning to the gas collection hood 1 mixes with the exhaust gas generated by the furnace, which can reduce the temperature of the exhaust gas entering the filtration system unit and prevent the exhaust gas temperature from being too high and affecting the filter bags of the bag filter 8.

[0044] In a preferred embodiment, the filtration system unit includes a cyclone separator 7 and a bag filter 8. The inlet end of the cyclone separator 7 is provided with a first pipe 20 that communicates with the smoke outlet 12 of the gas collection hood 1, and the outlet end is provided with a second pipe 30 that communicates with the inlet end of the bag filter 8. The outlet end of the bag filter 8 is provided with a third pipe 40 that communicates with the inlet end of the filter fan 2.

[0045] As a preferred embodiment, refer to Figure 1 , 7 8. To further reduce the temperature of the exhaust gas entering the filtration system unit, a cooler 9 for reducing the exhaust gas temperature is connected between the air inlet end of the first pipe 20 and the smoke outlet 12 of the gas collection hood 1. The cooler 9 includes a cooling bracket 91, a cooling ash hopper 92 mounted on the cooling bracket 91, a lower air box 93 mounted on the top of the cooling ash hopper 92, an upper air box 94 mounted above the lower air box 93, and a heat exchange module between the lower air box 93 and the upper air box 94. The upper air box 94 is divided into an upper air inlet chamber 941 and an upper air outlet chamber 942 by an upper partition 95. An air inlet pipe 60 is mounted on the upper air box 94, and the air outlet end of the air inlet pipe 60 is connected to the upper air box 94. The first pipe 20 is connected to the upper air inlet 941 and its air inlet end is connected to the smoke outlet 12 of the gas collection hood 1; the air inlet end of the first pipe 20 is connected to the upper air box 94 and connected to the upper air outlet 942; the lower air box 93 is divided into a lower air inlet 931 and a lower air outlet 932 by a lower partition 96; the heat exchange module includes a first heat exchange air pipe 97 and a second heat exchange air pipe 98, the upper ends of the first heat exchange air pipe 97 and the second heat exchange air pipe 98 are both connected to the upper air box 94, and the lower ends are both connected to the lower air box 93; the upper air inlet 941, the first heat exchange pipe, the lower air inlet 931, the cooling ash hopper 92, the lower air outlet 932, the second heat exchange pipe, and the upper air outlet 942 are connected in sequence to form a waste gas flow channel.

[0046] When the cooler 9 cools the exhaust gas, the exhaust gas collected by the gas collection hood 1 flows from the air inlet pipe 60 into the upper air inlet chamber 941, then flows downwards sequentially through the first heat exchange pipe, the lower air inlet chamber 931, and the cooling ash hopper 92, then flows upwards sequentially through the lower air outlet chamber 932, the second heat exchange pipe, and the upper air outlet chamber 942, and then flows through the first pipe 20 into the cyclone separator 7 for filtration. During this process, the cooler 9 exchanges heat with both the exhaust gas and the outside air, thereby transferring the temperature of the exhaust gas to the outside air and achieving the cooling treatment of the exhaust gas.

[0047] In this embodiment, to improve heat exchange efficiency, there are multiple first heat exchange ducts 97 and multiple second heat exchange ducts 98. These multiple first heat exchange ducts 97 and multiple second heat exchange ducts 98 are arranged in a longitudinal and transverse interval. The increased number of first and second heat exchange ducts 97 and multiple second heat exchange ducts 98 increases the heat exchange area of ​​the cooler 9, thereby improving the efficiency of heat exchange between the cooler 9 and the outside air, effectively reducing the temperature of the exhaust gas, and preventing excessively high exhaust gas temperature from affecting the service life of the filter bags in the bag filter 8. Furthermore, during the flow of exhaust gas inside the cooler 9, some particles in the exhaust gas fall into the cooling ash hopper 92, thus the cooler 9 also has a certain filtration function, improving the filtration effect of the environmental dust removal equipment. Simultaneously, to facilitate the cleaning of dust particles in the cooling ash hopper 92, a heat exchange ash discharge valve is provided at the bottom of the cooling ash hopper 92.

[0048] In a preferred embodiment, the exhaust pipe 3 is provided with a rain cover 70 located above the exhaust port. The rain cover 70 is used to reduce the probability of external rainwater and debris entering the exhaust pipe 3 from the exhaust port.

[0049] The above description is only a preferred embodiment of the present invention. Any technical solution that achieves the purpose of the present invention by essentially the same means is within the protection scope of the present invention.

Claims

1. A recirculating environmental dust removal device, comprising a gas collection hood (1) for collecting waste gas, a filtration system unit for filtering waste gas, a filter fan (2) for providing filtration power to the filtration system unit, and an exhaust pipe (3) for discharging filtered gas to the outside, wherein the air inlet of the filtration system unit is connected to the gas collection hood (1), and the air outlet is connected to the air inlet of the filter fan (2); one end of the exhaust pipe (3) is connected to the air outlet of the filter fan (2), and the other end is provided with an exhaust port, characterized in that: It also includes a return pipe (4) for sending the filtered gas back into the gas collection hood (1), wherein the inlet end of the return pipe (4) is connected to the outlet end of the filter fan (2) or the interior of the exhaust pipe (3), and the outlet end is connected to the interior of the gas collection hood (1). The outlet end of the return pipe (4) is provided with an air inlet pipe (6) for sending the filtered gas into the gas collection hood (1), and the air inlet pipe (6) is provided with an air inlet (61) for sending the filtered gas into the gas collection hood (1). There are two air inlet pipes (6), and the two air inlet pipes (6) are arranged at intervals; The air inlet (61) extends from top to bottom along the air inlet duct (6); The gas collection hood (1) is provided with a smoke hood opening (11), and the airflow ejected from the air inlet (61) forms an air curtain that blocks the smoke hood opening (11); The two air inlet pipes (6) are respectively located on the left and right sides of the fume hood opening (11). The air outlet (61) is inclined towards the central area of ​​the fume hood (1). The smoke outlet (12) is located at the top center of the fume hood (1). The central area inside the fume hood (1) is the area directly below the smoke outlet (12) inside the fume hood (1).

2. The reflux-type environmental dust removal equipment according to claim 1, characterized in that: The air inlet of the return pipe (4) is connected to the exhaust pipe (3) via an air guide pipe section (10). The lower end of the air guide pipe section (10) is connected to the exhaust pipe (3), and the upper end is inclined upward and connected to the air inlet of the return pipe (4).

3. The reflux-type environmental dust removal equipment according to claim 1, characterized in that: The exhaust pipe (3) is also equipped with a regulating valve (5) for adjusting the exhaust flow rate of the exhaust port.

4. The reflux-type environmental dust removal equipment according to claim 3, characterized in that: The regulating valve (5) includes a servo motor (51), a gearbox (52) driven by the servo motor (51), and a valve plate (53) controlled by the gearbox (52). The gearbox (52) is installed on the exhaust pipe (3), and the valve plate (53) is rotatably installed on the exhaust pipe (3). The valve plate (53) is used to close or open the exhaust port of the exhaust pipe (3).

5. A reflux-type environmental dust removal device according to any one of claims 1-4, characterized in that: The filtration system unit includes a cyclone separator (7) and a bag filter (8). The inlet end of the cyclone separator (7) is provided with a first pipe (20) that is connected to the smoke outlet (12) of the gas collection hood (1), and the outlet end is provided with a second pipe (30) that is connected to the inlet end of the bag filter (8). The outlet end of the bag filter (8) is provided with a third pipe (40) that is connected to the inlet end of the filter fan (2).

6. The reflux-type environmental dust removal equipment according to claim 5, characterized in that: The inlet end of the first pipe (20) and the outlet (12) of the gas collection hood (1) are connected together by a cooler (9) for reducing the temperature of the exhaust gas.

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