Biological filter material layer gas distribution system for waste gas treatment

Abstract

The invention discloses a gas distribution system for a filter material layer of a biological filter for waste gas treatment, and relates to the technical field of biological filters for waste gas treatment. Comprising a biological filter body, a biological filter material is arranged in the biological filter body, a plurality of gas distributors are uniformly distributed in the biological filter material, each gas distributor is of a vertical barrel structure, a plurality of first through holes are uniformly formed in the side part of each gas distributor, and a perforated bottom plate is arranged at the bottom of each gas distributor; a top sealing plate is arranged at the top end of the gas distributor. By arranging the gas distributor in the biological filter material, waste gas circulates in the first connecting pipe, the upper chamber, the upper filter material layer, the middle filter material layer, the lower filter material layer, the gas distributor, the lower chamber and the second connecting pipe, so that the air passing resistance of the filter material layers is controlled, and the treatment gas amount of the biological filter body is ensured; meanwhile, the gas is more uniformly distributed on the filter material layer, the problem of bias flow of the gas on the filter material layer is relieved, and the waste gas treatment effect is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of biological filter for waste gas treatment, and specifically to a gas distribution system for the filter media layer of a biological filter for waste gas treatment. Background Art

[0002] Waste gas treatment refers to a series of technical means and measures taken to reduce or eliminate harmful gases emitted during activities such as industrial production, transportation, and construction, so as to reduce environmental pollution, improve air quality, and protect human health.

[0003] The biological process is widely used in the field of waste gas treatment. Its representative equipment includes biological trickling filters, biological filters, and biological scrubbers. With the full popularization of this technology, its disadvantages in long-term operation and use have gradually emerged. Among them, the two problems that the pressure of the filter media layer increases year by year, resulting in an increase in the resistance of the later equipment, and the uneven gas distribution in the filter media layer, which easily leads to a low effective utilization rate of the filter media layer, are more prominent. Therefore, the present invention is proposed. Summary of the Invention

[0004] The purpose of the present invention is to provide a gas distribution system for the filter media layer of a biological filter for waste gas treatment to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A gas distribution system for the filter media layer of a biological filter for waste gas treatment, including a biological filter body. Inside the biological filter body, there is biological filter media. A plurality of gas distributors are evenly distributed in the biological filter media. The gas distributor is set as a vertical cylinder structure. A plurality of first through holes are evenly opened on the side of the gas distributor. An opening bottom plate is arranged at the bottom of the gas distributor, and a top sealing plate is arranged at the top of the gas distributor.

[0006] Preferably, a plurality of second through holes are evenly opened on the opening bottom plate. The diameters of the first through holes and the second through holes are smaller than the pore diameter of the biological filter media. The first through holes and the second through holes play a role in guiding the gas flow.

[0007] Preferably, the biological filter body is separated into an upper chamber and a lower chamber by the biological filter media.

[0008] Preferably, a filter media support plate is arranged at the bottom of the biological filter media. The filter media support plate is fixed on the inner wall of the biological filter body, and the gas distributor is installed on the filter media support plate.

[0009] Preferably, a first connecting pipe is connected and arranged on one side of the top of the biological filter body. The first connecting pipe is communicated with the upper chamber. A second connecting pipe is connected and arranged on one side of the lower part of the biological filter body. The second connecting pipe is communicated with the lower chamber.

[0010] Preferably, the biological filter media is provided with multiple layers, which are successively a lower filter media layer, a middle filter media layer, and an upper filter media layer from bottom to top, and are used for multi-stage treatment of waste gas.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] In the air distribution system of the filter media layer of the biological filter for waste gas treatment, through the setting of the gas distributor in the biological filter media, the waste gas flows through the first connecting pipe, the upper chamber, the upper filter media layer, the middle filter media layer, the lower filter media layer, the gas distributor, the lower chamber, and the second connecting pipe, so that the air passing resistance of the filter media layer is controlled, the treatment gas volume of the biological filter body is ensured, at the same time, the distribution of the gas in the filter media layer is made more uniform, the problem of gas deviation in the filter media layer is alleviated, and the waste gas treatment effect is ensured. Description of the Drawings

[0013] Figure 1 is the first sectional view of the present invention;

[0014] Figure 2 is the second sectional view of the present invention;

[0015] Figure 3 is the developed view of the gas distributor of the present invention;

[0016] Figure 4 is the front view of the gas distributor of the present invention;

[0017] Figure 5 is the schematic diagram of the flow state when the gas passes through the biological filter media from bottom to top without the gas distributor of the present invention;

[0018] Figure 6 is the schematic diagram of the flow state when the gas passes through the biological filter media from top to bottom without the gas distributor of the present invention;

[0019] Figure 7 is the schematic diagram of the flow state when the gas passes through the biological filter media from bottom to top with the gas distributor of the present invention;

[0020] Figure 8 is the schematic diagram of the flow state when the gas passes through the biological filter media from top to bottom with the gas distributor of the present invention;

[0021] Figure 9 is the schematic diagram of the flow state when the gas passes through the biological filter media from bottom to top with the gas distributor in the middle and late stages of the operation of the biological filter of the present invention;

[0022] Figure 10 is the schematic diagram of the flow state when the gas passes through the biological filter media from top to bottom with the gas distributor in the middle and late stages of the operation of the biological filter of the present invention;

[0023] Figure 11Schematic structural diagram of the placement mode of the gas distributor of the present invention on the filter media support plate.

[0024] In the figure: 1. Biological filter body; 2. Biological filter media; 201. Filter media support plate; 3. Gas distributor; 301. First through hole; 302. Perforated bottom plate; 303. Top sealing plate. Specific implementation mode

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] In the process of waste gas treatment, a filter media layer air distribution system needs to be used. The air distribution system provided by the present invention is specifically used to control the air passing resistance of the filter media layer, ensure the treatment gas volume of the biological filter, and at the same time make the gas distribution in the filter media layer more uniform, reducing the problem of gas deviation in the filter media layer. During the use of this system, prior inspection and other preparatory work need to be carried out to ensure the normal operation of this system.

[0027] As Figures 1-11 shown, the present invention provides a technical solution: a biological filter media layer air distribution system for waste gas treatment, including a biological filter body 1, a biological filter media 2 is arranged inside the biological filter body 1, a plurality of gas distributors 3 are evenly distributed in the biological filter media 2, the gas distributor 3 is set as a vertical cylinder structure, a plurality of first through holes 301 are evenly opened on the side of the gas distributor 3, a perforated bottom plate 302 is arranged at the bottom of the gas distributor 3, and a top sealing plate 303 is arranged at the top of the gas distributor 3. It should be noted that the gas distributor 3 has non-fixed dimensions and shapes, and is usually set as a circular cylinder structure or a square cylinder structure.

[0028] In the embodiment, a plurality of second through holes are evenly opened on the perforated bottom plate 302. The diameters of the first through holes 301 and the second through holes are smaller than the aperture of the biological filter media 2. The first through holes 301 and the second through holes play a role in guiding the gas flow. It should be noted that the first through holes 301 and the second through holes are not limited to small apertures. When the first through holes 301 and the second through holes are large holes, that is, the apertures of the first through holes 301 and the second through holes are larger than the aperture of the biological filter media 2, a fine mesh screen is covered on the inner wall or outer wall of the gas distributor 3 to prevent the biological filter media 2 from entering, and the arrangement quantity and form of the gas distributor 3 in the biological filter media 2 need to be confirmed through calculation.

[0029] In an embodiment, the biological filter body 1 is divided into an upper chamber and a lower chamber by a biological filter material 2. A filter material support plate 201 is arranged at the bottom of the biological filter material 2, and the filter material support plate 201 is fixed on the inner wall of the biological filter body 1. A gas distributor 3 is installed on the filter material support plate 201.

[0030] In an embodiment, a first connecting pipe is communicatively connected to one side of the top of the biological filter body 1. The first connecting pipe is communicatively connected to the upper chamber. A second connecting pipe is communicatively connected to one side of the lower part of the biological filter body 1. The second connecting pipe is communicatively connected to the lower chamber. The biological filter material 2 is provided with multiple layers, which are, from bottom to top, a lower filter material layer, a middle filter material layer, and an upper filter material layer, for performing multi-stage treatment on the waste gas. Through the arrangement of the gas distributor 3 in the biological filter material 2, the waste gas flows through the first connecting pipe, the upper chamber, the upper filter material layer, the middle filter material layer, the lower filter material layer, the gas distributor 3, the lower chamber, and the second connecting pipe, so that the air passing resistance of the filter material layer is controlled, the gas treatment capacity of the biological filter body 1 is ensured, and at the same time, the distribution of the gas in the filter material layer is made more uniform, the problem of gas deviation in the filter material layer is alleviated, and the waste gas treatment effect is ensured. Among them, the biological filter material 2 is a prior art.

[0031] Working principle: When using this system for waste gas treatment, in the initial stage of the operation of the biological filter body 1, the air passing speed of the filter material layer is relatively low. When the waste gas passes through the biological filter material 2 from bottom to top, a large amount of waste gas starts from the lower chamber in the lower space of the biological filter material 2 and passes through the lower filter material layer, the middle filter material layer, and the upper filter material layer in sequence and then reaches the upper chamber in the upper space of the filter material layer. A small amount of waste gas directly enters the middle filter material layer through the gas distributor 3 and then reaches the upper chamber in the upper space of the biological filter material 2 through the upper filter material layer. When the waste gas passes through the biological filter material 2 from top to bottom, a large amount of waste gas starts from the upper chamber in the upper space of the biological filter material 2 and passes through the upper filter material layer, the middle filter material layer, and the lower filter material layer in sequence and then reaches the upper chamber in the upper space of the filter material layer. After a small amount of waste gas passes through the upper filter material layer, it directly enters the lower chamber in the lower space of the biological filter material 2 through the gas distributor 3 in the middle filter material layer. At this time, the gas distributor 3 plays a role in guiding the air flow. Compared with the filter material structure without the gas distributor 3, the distribution of the gas in the filter material layer is more uniform, and the problem of gas deviation in the filter material layer is alleviated.

[0032] In the middle and late stages of the operation of the biological filter body 1, due to problems such as the accumulation of microbial metabolism and the compression of the filter media layer, the porosity of the filter media layer decreases or even local caking occurs. This situation mostly appears in the middle filter media layer and the lower filter media layer, which in turn leads to an increase in the air passing velocity of the filter media layer and a significant increase in the air passing resistance of the filter media layer. Since the gas distributor 3 itself will not become a carrier for microbial film formation or has a low film formation rate and no blockage problem, at this time, the gas distributor 3 provides a channel for the exhaust gas to directly pass through the lower filter media layer or the middle filter media layer. When the exhaust gas passes through the middle filter media layer and the lower filter media layer, a small amount of exhaust gas directly passes through the filter media layer, and a large amount of exhaust gas will pass through the middle filter media layer and the lower filter media layer through the gas distributor 3, effectively controlling the air passing resistance of the filter media layer and ensuring the gas treatment volume of the biological filter body 1.

[0033] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A gas distribution system for the filter media layer of a biological filter for waste gas treatment, comprising a biological filter body (1), characterized in that: Inside the biological filter body (1), there is biological filter media (2). Multiple gas distributors (3) are evenly distributed within the biological filter media (2). The gas distributor (3) is arranged in a vertical cylindrical structure. A plurality of first through holes (301) are evenly formed on the side of the gas distributor (3). An opening bottom plate (302) is provided at the bottom of the gas distributor (3), and a top sealing plate (303) is provided at the top of the gas distributor (3).

2. The air distribution system for the biological filter media layer used in waste gas treatment according to claim 1, wherein: A plurality of second through holes are evenly formed on the opening bottom plate (302). The diameters of the first through holes (301) and the second through holes are smaller than the pore diameter of the biological filter media (2). The first through holes (301) and the second through holes play a role in guiding the gas flow.

3. The air distribution system for the biological filter media layer for waste gas treatment according to claim 1, wherein: The biological filter body (1) is divided into an upper chamber and a lower chamber by the biological filter media (2).

4. The air distribution system for the biological filter media layer for waste gas treatment according to claim 1, wherein: A filter media support plate (201) is provided at the bottom of the biological filter media (2). The filter media support plate (201) is fixed to the inner wall of the biological filter body (1), and the gas distributor (3) is installed on the filter media support plate (201).

5. The air distribution system for the biological filter media layer used in waste gas treatment according to claim 3, characterized in that: One side at the top of the biological filter body (1) is connected and provided with a first connecting pipe, and the first connecting pipe is communicated with the upper chamber. One side at the lower part of the biological filter body (1) is connected and provided with a second connecting pipe, and the second connecting pipe is communicated with the lower chamber.

6. The air distribution system for the biological filter media layer for waste gas treatment according to claim 1, characterized in that: The biological filter media (2) is provided with multiple layers, which are successively the lower filter media layer, the middle filter media layer, and the upper filter media layer from bottom to top, for multi-stage treatment of the waste gas.

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