Combined waste gas treatment device

Abstract

The utility model provides a combined waste gas treatment device, which relates to the technical field of waste gas treatment and comprises a gas inlet, a gas outlet and a plurality of treatment units. The waste gas treatment area comprises a filler filling area, a demisting structure and an overflowing channel for connecting the waste gas treatment area in each stage of treatment unit, the demisting structure comprises a plate type demisting structure, the plate type demisting structure comprises a plurality of obliquely arranged plate bodies, and a gap for gas to pass through is formed between every two adjacent plate bodies. By arranging the overflowing channel, a traditional pipeline and flange combined connection mode is replaced, and the overall occupied area of equipment is reduced. The demisting structure is arranged in the open space of the overflowing channel, so that the liquid entrainment amount among the stages is reduced, the gas flowing resistance is reduced, and the gas distribution uniformity is enhanced.

Description

Technical Field

[0001] This utility model relates to the field of waste gas treatment technology, and in particular to a combined waste gas treatment device. Background Technology

[0002] Malodorous substances severely impact the daily lives of nearby residents and adversely affect their health. These malodorous components contain not only inorganic compounds such as ammonia and hydrogen sulfide, but also fatty acids, aldehydes, ketones, amines, ethers, halogenated hydrocarbons, aliphatic, aromatic, and heterocyclic nitrogen compounds. To reduce the environmental impact of malodorous gases, appropriate technical measures are needed for treatment. Single treatment processes are often insufficient to achieve odorless removal; therefore, combined treatment methods, such as chemical washing, biological methods, photocatalytic oxidation, activated carbon adsorption-desorption, and chemical filter adsorption, are receiving increasing attention.

[0003] In conventional solutions, such as the waste gas treatment device combining a scrubbing tower and UV photocatalysis disclosed in Chinese patent CN212492321U, the multi-stage combined process equipment is spliced ​​together by connecting pipes and flanges. The pipes between the equipment require a certain amount of space, and the flange connections are prone to bolt corrosion and leakage risks.

[0004] In addition, when multiple processes such as chemical washing, biological treatment, activated carbon adsorption-desorption, chemical filter adsorption, and photocatalytic oxidation are combined, built-in and external demisters are often installed to reduce liquid entrainment between each stage of equipment and reduce mutual interference between stages. However, the installation of demisters results in high gas flow resistance, and the demister effect often fails to meet the treatment requirements.

[0005] This application is filed to address the aforementioned deficiencies. Utility Model Content

[0006] The purpose of this invention is to provide a combined waste gas treatment device that optimizes structural design, reduces equipment footprint, optimizes demisting effect between different processes, reduces demisting structural resistance, and improves waste gas treatment equipment efficiency.

[0007] To address the aforementioned problems, this utility model provides a combined waste gas treatment device, comprising an air inlet, an air outlet, and several treatment units. Each treatment unit includes a waste gas treatment zone, and several waste gas treatment zones are connected sequentially. Each waste gas treatment zone includes a packing area, a demisting structure, and a flow channel for connecting the waste gas treatment zones in each stage of the treatment unit. The demisting structure is preferably disposed in the flow channel. Since the treatment units are connected through the flow channel, there is no need to install pipes, which can reduce the space occupied by the equipment. The demisting structure includes a plate-type demisting structure, and at least a portion of the waste gas treatment zones are provided with a plate-type demisting structure. Waste gas enters the waste gas treatment zone through the air inlet, is treated, and is discharged through the air outlet. The plate-type demisting structure includes several inclined plates, with gaps between adjacent plates for gas to pass through.

[0008] According to one embodiment of the present invention, each processing unit has at least two sets of exhaust gas treatment zones, namely an upper treatment zone and a lower treatment zone, and the exhaust gas can enter the upper treatment zone and the lower treatment zone simultaneously.

[0009] According to one embodiment of the present invention, the exhaust gas treatment zone is provided with a spray module, and the lower treatment zone is provided with a liquid storage tank, which is used to receive the spray liquid flowing out from the demisting structure, the upper treatment zone and the lower treatment zone.

[0010] According to one embodiment of the present invention, the plate-type defogging structure is disposed in the lower processing area, and the defogging structure further includes a polyurethane defogging structure disposed in the upper processing area, and at least two sets of the polyurethane defogging structure are provided. The main component of the polyurethane defogging structure is a polyurethane hollow sphere with a certain diameter.

[0011] According to one embodiment of the present invention, a polyurethane demisting structure is also provided in the lower processing zone. The plate-type demisting structure and the polyurethane demisting structure are arranged sequentially. The main function of the polyurethane demisting structure is to further intercept fine water mist with smaller particle size.

[0012] According to one embodiment of the present invention, the upper processing area is provided with a water baffle plate, which is used to collect water mist intercepted by the demisting structure and return it to the upper filler layer after collection, so as to prevent water droplets from falling and entering the next unit with the airflow.

[0013] According to one embodiment of the present invention, the plate body is provided in at least two columns, and the two adjacent plates in each column are arranged in an inverted "V" shape.

[0014] According to one embodiment of the present invention, the included angle between two adjacent plates in each row is 60~120°, and the distance between two adjacent rows is 5~10cm.

[0015] According to one embodiment of the present invention, in order to reduce the influence between the plates at each level, a V-shaped guide groove is provided on the edge of each plate, and the edge of the V-shaped guide groove is at an angle of 60~90° with the defogging baffle.

[0016] According to one embodiment of the present invention, the plurality of processing units include a primary chemical washing unit, a biological treatment unit, and a secondary chemical washing unit.

[0017] Furthermore, the air outlet can be connected to an end-of-pipe deep treatment process, which can be one or more of activated carbon adsorption-desorption, chemical filter adsorption, and photocatalytic oxidation.

[0018] The beneficial effects of this invention are that by setting up a flow channel to replace the traditional pipe and flange combination connection method, the overall footprint of the equipment is reduced. The open space of the flow channel is used to set up a demisting structure, reducing liquid entrainment between stages, reducing gas flow resistance, and enhancing the uniformity of gas distribution. The optimized demisting structure improves the capture of water mist of different particle sizes, reduces secondary liquid entrainment between the demisting structure plates, improves the demisting efficiency and reagent utilization rate between each unit of the equipment, and reduces the impact of water mist on the final deep treatment process. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of the internal processing unit distribution structure of a combined waste gas treatment device.

[0021] Figure 2 This is a schematic diagram of the internal structure of a combined waste gas treatment device;

[0022] Figure 3 This is a schematic diagram of the airflow direction during waste gas treatment;

[0023] Figure 4 This is a schematic diagram of a plate-type demisting structure;

[0024] Figure 5 This is a three-dimensional structural diagram of a plate-type demisting structure. Detailed Implementation

[0025] The following description is only intended to disclose the present invention so that those skilled in the art can implement it. The embodiments in the following description are merely examples, and those skilled in the art will conceive of other obvious modifications. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other solutions that do not depart from the spirit and scope of the present invention.

[0026]

Example 1

[0027] Combined waste gas treatment devices, such as Figure 1 It includes an air inlet 1, an air outlet 2, a housing, and several processing units 16. The air inlet 1 and the air outlet 2 are located in the middle of the housing, and the processing units 16 are located in the housing.

[0028] In this embodiment, the processing unit 16 is set up in three groups, namely a primary chemical washing unit 11, a biological treatment unit 12, and a secondary chemical washing unit 13. The primary chemical washing unit 11 and the secondary chemical washing unit 13 are basic units, and the biological treatment unit 12 can be added or removed according to the actual working conditions.

[0029] The air outlet 2 can be connected to an end-of-pipe deep treatment process, which can be one or more of activated carbon adsorption-desorption, chemical filter adsorption, and photocatalytic oxidation.

[0030] Each processing unit 16 includes an exhaust gas treatment zone 17, which consists of an upper treatment zone 171 and a lower treatment zone 172. The upper treatment zone 171 and the lower treatment zone 172 are separated by a grid plate 14. The exhaust gas treatment zone 17 includes a packing area 3, a spray module 5, a demisting structure, and a flow channel 15 for connecting the exhaust gas treatment zones 17 in each stage of the processing unit 16. The first and last flow channels 15 are also used to connect the air inlet 1 and the air outlet 2, respectively. The packing area 3 is used to set a packing layer. The spray module 5 includes a nozzle set at the position of the packing area 3. The spray module 5 is connected to the spray liquid pipe 4.

[0031] The demisting structure is installed in the flow channel 15, preferably at the air outlet where the packing area 3 connects to the flow channel 15. This placement at the air outlet enhances airflow distribution and reduces the extra space it occupies inside the equipment, thus decreasing the overall size of the device.

[0032] Each processing unit is connected via a flow channel 15, eliminating the need for piping and reducing the space occupied by the equipment.

[0033] The defogging structure 7 includes a plate-type defogging structure 9 and a polyurethane defogging structure 8.

[0034] To reduce the equipment's footprint, the device integrates demisting and airflow distribution within the flow channel. Taking the primary chemical scrubbing unit 11 as an example, after the exhaust gas enters the unit through the inlet 1, it enters the packing layer from both the top and bottom. The upper airflow exits through the top outlet, where a polyurethane demisting structure 8 is located, situated on a support platform. The lower airflow exits through the bottom outlet, where a plate-type demisting structure 9 is located, situated on a grid plate within the flow channel 15. The two airflows ultimately converge at the middle section before entering the next unit.

[0035] To improve the demisting efficiency of the equipment, the plate-type demisting structure 9 includes several inclined plates 72, all of which are mounted on a support 73. There are gaps between adjacent plates 72 for gas to pass through. Figure 4 , Figure 5 The board 72 is arranged in two columns and multiple rows. The two adjacent boards 72 in each row are arranged in an inverted "V" shape. The included angle between the two boards 72 is 60~120°, and the distance between the upper and lower rows is 5~10cm.

[0036] To reduce the influence between the various plates 72, each plate is provided with a V-shaped guide groove 71 at its edge, with the edge of the V-shaped guide groove at an angle of 60~90° to the demisting baffle.

[0037] The main components of the polyurethane defogging structure are polyurethane hollow spheres of a certain diameter, which are randomly stacked on the grid plate. The diameter of the polyurethane hollow spheres is 2-5cm, and the stacking height is 10-30cm.

[0038] Preferably, when the polyurethane defogging structure 8 is placed in the upper treatment zone 171, the airflow flows from left to right; when placed in the lower treatment zone 172, the airflow flows from bottom to top.

[0039] like Figure 2 A liquid storage tank 6 is provided in the lower treatment zone 172. The liquid storage tank 6 is separated from the packing zone 3 by a grid plate 14. The liquid storage tank 6 is used to receive the sprayed liquid flowing out from the demisting structure, the upper treatment zone 171 and the lower treatment zone 172. The plate demisting structure 9 is provided in the lower treatment zone 172, and the polyurethane demisting structure 8 is provided in the upper treatment zone 171 and the lower treatment zone 172. The plate demisting structure 9 and the polyurethane demisting structure 8 are arranged sequentially in the lower treatment zone 172. The main function of the polyurethane demisting structure 8 is to further intercept fine water mist with smaller particle size.

[0040] A baffle plate 10 is installed at the position of the polyurethane demisting structure 8 in the upper treatment zone 171. The baffle plate 10 is used to collect the water mist intercepted by the demisting structure 7 and return it to the upper packing layer after collection, so as to prevent water droplets from falling and entering the next unit with the airflow.

[0041] Working principle: such as Figure 3 The exhaust gas enters the exhaust gas treatment chamber through the primary chemical scrubbing unit 11, where it undergoes pretreatment. It then enters the biological treatment unit 12 for enhanced treatment. The treated exhaust gas then passes through the secondary chemical scrubbing unit 13 before entering the final treatment device for further treatment.

[0042] Specifically, after the exhaust gas enters through the central inlet 1 of the device, it is split into two paths, upper and lower, passing through the grid plate 14 into the packing layer in the packing area 3 for the first diversion. The exhaust gas is adsorbed and degraded by the spray liquid, biofilm, and solid media in the packing layer. The spray liquid is sprayed from the nozzle, flows down the packing layer from the upper part to the lower part, and falls into the water storage tank 6 from the bottom of the grid plate 14. The airflow intercepts the droplets at the bottom of the grid plate 14 through the demisting structure 7 located at the air outlet, removing the streams of droplets carried in the airflow.

[0043] In order to prevent the droplets falling from the bottom of the grid plate 14 from forming a water curtain on the plate body 72 of the plate-type demisting structure 9 and obstructing the gas flow, the guide channel 71 is used to guide the stream of water at the top of the plate body 72 to both sides of the plate body, thereby avoiding the formation of a water curtain and reducing the air resistance.

[0044] To further improve the interception of small water mist particles in the airflow, a polyurethane demisting structure 8 is installed at the rear end of the plate-type demisting structure 9. This structure utilizes porous polyurethane spheres to increase the contact probability between the fine water mist and the spheres, thereby intercepting more fine water mist. Through multi-stage interception of water mist, the mutual influence between different units is reduced.

[0045] For the upper treatment zone 171, since there is no flowing water, a two-stage polyurethane demister structure 8 is installed at the air outlet connecting the packing area 3 and the flow channel 15 to enhance the interception of fine water mist, thereby improving the demister effect in the upper area of ​​the device. The water mist carried by the airflow is largely intercepted in the first-stage demister structure and flows back to the upper packing layer through the water collection tank set between the two stages. At the same time, when the gas passes through the first-stage demister structure, turbulence is formed in the first- and second-stage interval area under the action of the polyhedral spheres, increasing the contact area between the airflow and the second-stage demister structure, thereby improving the demister efficiency and reducing liquid entrainment. A baffle plate 10 is set at the rear end of the demister structure to collect the water mist intercepted by the demister structure. After collection, the water mist flows back to the upper packing layer to prevent water droplets from falling and entering the next unit with the airflow.

[0046] After being processed by one of the treatment units 16, the exhaust gas converges into the flow channel 15 in the middle section and then splits into upper and lower paths to pass through the packing layer of the next treatment unit 16, and then converges back into the middle section. The above steps are repeated until the exhaust port 2 is reached.

[0047] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations and modifications.

Claims

1. A combined waste gas treatment device, characterized in that: It includes an air inlet (1), an air outlet (2) and several processing units (16). Each processing unit (16) includes a waste gas treatment zone (17). Several waste gas treatment zones (17) are connected in sequence. Each waste gas treatment zone (17) includes a packing area (3), a spray module (5), a demisting structure and a flow channel (15) for connecting the waste gas treatment zones (17) in each level of processing unit (16). Waste gas enters the waste gas treatment zone through the air inlet (1) and is discharged through the air outlet (2) after being treated. The demisting structure (7) includes a plate demisting structure (9). The plate demisting structure (9) is set in the flow channel (15) and includes several inclined plates (72). There is a gap between adjacent plates (72) for gas to pass through.

2. The combined waste gas treatment device according to claim 1, characterized in that: Each processing unit (16) has at least two sets of exhaust gas treatment zones (17), namely an upper treatment zone (171) and a lower treatment zone (172), and the exhaust gas can enter the upper treatment zone (171) and the lower treatment zone (172) at the same time.

3. The combined waste gas treatment device according to claim 2, characterized in that: The lower treatment zone (172) is provided with a liquid storage tank (6), which is used to receive the spray liquid flowing out from the demisting structure, the upper treatment zone (171) and the lower treatment zone (172).

4. The combined waste gas treatment device according to claim 3, characterized in that: The plate-type demisting structure (9) is located in the lower treatment zone (172). The demisting structure (7) also includes a polyurethane demisting structure (8). The polyurethane demisting structure (8) is located in the upper treatment zone (171), and at least two sets are provided.

5. The combined waste gas treatment device according to claim 4, characterized in that: The lower processing zone (172) is also equipped with a polyurethane demisting structure (8), and the plate demisting structure (9) and the polyurethane demisting structure (8) are arranged sequentially.

6. The combined waste gas treatment device according to claim 4 or 5, characterized in that: The upper processing zone (171) is provided with a water baffle (10), which is used to collect water mist intercepted by the demisting structure (7).

7. The combined waste gas treatment device according to any one of claims 1-4, characterized in that: The plate (72) is provided in at least two columns, and the two adjacent plates (72) in each row are arranged in an inverted "V" shape.

8. The combined waste gas treatment device according to claim 7, characterized in that: The included angle between two adjacent plates (72) in each row is 60~120°, and the distance between two adjacent rows is 5~10cm.

9. The combined waste gas treatment device according to claim 8, characterized in that: The plate (72) is provided with a flow guide groove (71).

10. The combined waste gas treatment device according to any one of claims 1-4, characterized in that: The plurality of processing units include a primary chemical washing unit (11), a biological treatment unit (12), and a secondary chemical washing unit (13).

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