High-concentration and low-concentration organic waste gas mixing device

Abstract

The utility model discloses a high-low-concentration organic waste gas mixing device, which is particularly suitable for mixing small-flow high-concentration waste gas and large-flow low-concentration waste gas, and at least comprises a cylinder body, which is enclosed by an upper sealing plate, a lower sealing plate and a cylinder wall, the lower sealing plate is provided with a low-concentration waste gas inlet and a high-concentration waste gas inlet, and the upper sealing plate is provided with a mixed waste gas outlet; the mixed waste gas distribution plates are arranged in a multi-layer mode and are horizontally arranged in the cylinder body at intervals, one half area of each mixed waste gas distribution plate is provided with holes, the other half area of each mixed waste gas distribution plate is closed, the hole areas of the adjacent layers are arranged in a staggered mode, and a baffling channel for mixed waste gas from bottom to top is formed; and the high-concentration waste gas distribution pipe is vertically arranged in the center of the barrel and fixed to the mixed waste gas distribution plate in a penetrating mode, and through holes are evenly formed in the wall face of the high-concentration waste gas distribution pipe and used for injecting high-concentration waste gas into the baffling channel in a step-by-step dispersing mode. According to the utility model, the concentration distribution of mixed waste gas is more uniform, and the safe, efficient and stable operation of a subsequent organic waste gas treatment device is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental protection waste gas treatment, and particularly relates to a high-low concentration organic waste gas mixing device. Background Technique

[0002] The waste gas generated in the petrochemical industry, in addition to organized sources such as oxidized asphalt tail gas, reforming catalyst regeneration flue gas, and oxidized mercaptan removal tail gas, also includes a large amount of unorganized source waste gas, which needs to be properly sealed, collected, and centrally treated to meet the discharge standards. The emission characteristics of different types of unorganized source waste gas are different. For example, the VOCs concentration in the tank area waste gas will vary with the breathing volume of the storage tank, and the waste gas concentration shows a fluctuating change of high and low. However, even during the low emission period, the VOCs concentration of its emission is still relatively high; the waste gas emitted during the rubber production process not only has a large VOCs emission volume and a low concentration, but also has a complex pollutant composition; the waste gas emitted from the oil separation tank, air flotation tank, waste oil tank, floating slag tank, etc. in the sewage treatment plant has a small waste gas volume but a high concentration; the waste gas emitted from the biological wastewater treatment facilities such as the aeration tank, A / O tank, oxidation ditch, membrane bioreactor, and anaerobic tank in the sewage treatment plant has a large waste gas volume but a low concentration. When treating waste gas, different types of complex organic waste gas need to be mixed evenly before being sent to the subsequent waste gas treatment device.

[0003] Among many waste gas treatment technologies, catalytic oxidation and regenerative oxidation are the main methods for purifying VOCs waste gas, which can meet the near-zero emission standards. Whether using catalytic oxidation technology or regenerative oxidation technology, to achieve the safe, efficient, and stable operation of the device, the imported VOCs waste gas needs to meet certain requirements, that is, the imported waste gas concentration range should meet the device design requirements, and the waste gas concentration distribution should be relatively uniform.

[0004] Industrially, a homogenization tank is often used to complete the uniform mixing of high-low concentration organic waste gas. Each path of waste gas is sent into the homogenization tank at the same time. Generally, a homogenizing agent layer is provided in the homogenization tank. Under the action of the homogenizing agent, the "peak shaving" and "valley filling" of the waste gas concentration can be realized, so as to quickly suppress the VOCs concentration fluctuation. However, due to the large volume and large floor area of the homogenization tank, and the homogenizing agent in the homogenization tank needs to be replaced regularly, the investment and operation cost of the device are increased.

[0005] In the prior art, there are also some technical solutions that do not use homogenizing agents and only optimize the mixing effect of VOCs waste gas through the design of internal components in the mixing device. For example, Chinese Patent CN214261415U discloses an organic waste gas mixing device, including: a mixing cavity is arranged in a housing, a first air inlet is communicated with the mixing cavity, and a second air inlet is connected to the mixing cavity through a plurality of air guide pipes; the included angle between the air inlet directions of the first air inlet and the second air inlet is 45-90°; a rupture disc is installed on the housing; a spoiler is installed in the mixing cavity; an exhaust port is communicated with the mixing cavity. This solution can solve the problem of uneven mixing of high-concentration and low-concentration waste gases in an ordinary mixing box. By setting the first air inlet and the second air inlet, high-air-volume low-concentration waste gas and low-air-volume high-concentration waste gas are simultaneously transported into the mixing cavity, and through the connection of a plurality of air guide pipes, the low-air-volume high-concentration waste gas can be divided into multiple airflows and enter the mixing cavity dispersedly. However, when the concentration of the high-concentration waste gas is relatively high, it is difficult to control the concentration of the mixed waste gas in the local area of the high-concentration waste gas inlet to be lower than the lower explosion limit, which poses a certain safety hazard.

[0006] Therefore, there is an urgent need for an organic waste gas mixing device that is suitable for the case where the concentration difference and flow difference of organic waste gas are relatively large, and can make the concentration distribution of the mixed waste gas more uniform.

[0007] The information disclosed in this background art section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art already known to those of ordinary skill in the art. Summary of the Invention

[0008] The purpose of the present invention is to provide a high-low concentration organic waste gas mixing device, which can make the concentration distribution of the mixed waste gas more uniform, is beneficial to the safe, efficient and stable operation of subsequent organic waste gas treatment devices, and is particularly suitable for the occasion where the concentration difference and flow difference of organic waste gas are relatively large.

[0009] To achieve the above purpose, the present invention provides a high-low concentration organic waste gas mixing device, which is particularly suitable for mixing small-flow high-concentration waste gas and large-flow low-concentration waste gas, and at least includes: a cylinder body, which is enclosed by an upper sealing plate, a lower sealing plate and a cylinder wall, the lower sealing plate is provided with a low-concentration waste gas inlet and a high-concentration waste gas inlet, and the upper sealing plate is provided with a mixed waste gas outlet; a mixed waste gas distribution plate, which is arranged in a multi-level and horizontally spaced manner in the cylinder body, half of the area of the mixed waste gas distribution plate is provided with openings, and the other half is closed, and the opening areas of adjacent levels are arranged staggeredly to form a folded flow channel for the mixed waste gas from bottom to top; a high-concentration waste gas distribution pipe, which is vertically arranged in the center of the cylinder body and passes through and is fixed on the mixed waste gas distribution plate, and through holes are evenly opened on the wall surface of the high-concentration waste gas distribution pipe for injecting high-concentration waste gas into the folded flow channel step by step and dispersedly.

[0010] Furthermore, in the above technical solution, the high-concentration waste gas distribution pipe is arranged through in the cylinder body, with the upper end fixed on the upper sealing plate and the lower end communicated with the high-concentration waste gas inlet.

[0011] Furthermore, in the above technical solution, the high-concentration waste gas distribution pipe can be of a single pipe structure or a multi-branch pipe structure. The number and total area of the openings of the pipe can be determined according to the gas volume of the high-concentration waste gas and the diameter of the high-concentration waste gas distribution pipe.

[0012] Furthermore, in the above technical solution, when a single pipe structure is adopted, the number of openings along the circumferential direction of the pipe is preferably 4 to 6; the equivalent diameter of the opening is preferably 10 to 40 mm; the distance between adjacent openings can be 1.2 to 2 times the aperture.

[0013] Furthermore, in the above technical solution, the openings in half of the area of the mixed waste gas distribution plate are evenly arranged; the number and total area of the openings can be determined according to the gas volume of the mixed waste gas, and the total opening area of each layer of the mixed waste gas distribution plate satisfies that the flow velocity of the mixed waste gas is 0.2 to 3 m / s.

[0014] Furthermore, in the above technical solution, the flow velocity of the mixed waste gas is preferably the same as the flow velocity of the high-concentration waste gas flowing out of the high-concentration waste gas distribution pipe.

[0015] Furthermore, in the above technical solution, the distance between adjacent mixed waste gas distribution plates can be 0.3 to 1 times the radius of the inner cylinder.

[0016] Furthermore, in the above technical solution, the structural forms of the upper sealing plate and the lower sealing plate can be flat cover sealing plates, elliptical sealing plates, semi-circular sealing plates or dish-shaped sealing plates.

[0017] Furthermore, in the above technical solution, the cylinder body, the mixed waste gas distribution plate and the high-concentration waste gas distribution pipe can all be made of carbon steel or stainless steel.

[0018] Compared with the prior art, the present utility model has the following beneficial effects:

[0019] 1) By arranging multiple levels of the mixed waste gas distribution plate and arranging them horizontally at intervals, and staggering the openings of the distribution plates of adjacent layers, the present utility model can arrange the channels of the mixed waste gas as a zigzag channel, increasing the flow length of the mixed waste gas in a limited space, prolonging the mixing time, and enhancing the mass transfer effect;

[0020] 2) The vertical and through arrangement of the high-concentration waste gas distribution pipe of the present utility model can introduce high-concentration waste gas into the zigzag channels of different levels at different heights respectively, realizing the step-by-step and dispersed injection of high-concentration waste gas, rather than injecting all at once and mixing with low-concentration waste gas. This avoids the excessive concentration of the mixed waste gas in a local area, and can ensure that the concentration of the mixed waste gas in the whole area is lower than the lower explosion limit, being safer and more reliable;

[0021] 3) The structural design of the present utility model enables part of the high-concentration waste gas to flow horizontally out from the side walls at different heights of the high-concentration waste gas distribution pipe and flow into the baffle channels at different levels, where it can be fully diffused within the horizontal cross-section above the openings of the mixed waste gas distribution plate. When the high- and low-concentration waste gases flow relatively vertically, the large-flow low-concentration waste gas carries the small-flow high-concentration waste gas and continues to flow, effectively enhancing the uniform mixing effect between the two;

[0022] 4) If the high-concentration waste gas distribution pipe of the present utility model adopts a structural form of multiple branch pipes, the pipe diameter is smaller than that of a single pipe, and the gas flow in all directions can be more uniform, which is more conducive to the uniformity of injecting the high-concentration waste gas into the baffle channel, helping to improve the mixing efficiency and effect;

[0023] 5) The high- and low-concentration organic waste gas mixing device of the present utility model has the characteristics of simple structure, small volume and floor area, and relatively uniform distribution of the waste gas concentration after mixing, which is beneficial to the safe, efficient and stable operation of the subsequent organic waste gas treatment device, and is particularly suitable for occasions where the difference in the concentration of organic waste gas is large and the difference in flow rate is large (that is, the mixing of small-flow high-concentration waste gas and large-flow low-concentration waste gas).

[0024] The above description is only an overview of the technical solution of the present utility model. In order to more clearly understand the technical means of the present utility model and be able to implement it according to the content of the specification, and at the same time to make the above and other purposes, technical features and advantages of the present utility model more understandable, one or more preferred embodiments are listed below and described in detail with reference to the accompanying drawings as follows. Description of the Drawings

[0025] Figure 1 is an internal cross-sectional view of the high- and low-concentration organic waste gas mixing device of the present utility model.

[0026] Figure 2 is Figure 1 the cross-sectional view taken along the line A-A in

[0027] Main reference numeral description:

[0028] 1 - mixing device, 10 - cylinder body, 101 - low-concentration waste gas inlet, 102 - high-concentration waste gas inlet, 103 - mixed waste gas outlet, 11 - mixed waste gas distribution plate, 11A - first-stage mixed waste gas distribution plate, 11B - second-stage mixed waste gas distribution plate, 11C - third-stage mixed waste gas distribution plate, 11D - fourth-stage mixed waste gas distribution plate, 110 - first through hole, 12 - high-concentration waste gas distribution pipe, 120 - second through hole. Detailed Embodiment

[0029] The following will describe in detail the specific embodiments of the present utility model in conjunction with the accompanying drawings. It should be understood that the protection scope of the present utility model is not limited by the specific embodiments.

[0030] Unless otherwise clearly stated, throughout the specification and claims, the term "comprise" or its variations such as "comprises" or "comprising" etc. will be understood to include the stated elements or components, without excluding other elements or other components.

[0031] In this article, for the convenience of description, spatial relative terms such as "below", "beneath", "under", "above", "over", "on" etc. can be used to describe the relationship between one element or feature and another element or feature in the accompanying drawings. It should be understood that the spatial relative terms are intended to encompass different directions of the object in use or operation in addition to the directions depicted in the figures. For example, if the object in the figure is flipped, the element described as "below" or "under" other elements or features will be oriented "above" the said element or feature. Therefore, the exemplary term "below" can include both the lower and upper directions. The object can also have other orientations (rotated 90 degrees or other orientations) and the spatial relative terms used herein should be interpreted accordingly.

[0032] In this article, terms such as "first", "second" etc. are used to distinguish two different elements or parts, and are not used to limit a specific position or relative relationship. In other words, in some embodiments, the terms "first", "second" etc. can also be interchanged with each other.

[0033] As Figure 1 、 2 shown, the present utility model provides a high-low concentration organic waste gas mixing device 1, which is particularly suitable for mixing small-flow high-concentration waste gas and large-flow low-concentration waste gas, and at least includes a cylinder body 10, a mixed waste gas distribution plate 11 and a high-concentration waste gas distribution pipe 12. Among them, the cylinder body 10 is enclosed by an upper sealing plate, a lower sealing plate and a cylinder wall. The lower sealing plate is provided with a low-concentration waste gas inlet 101 and a high-concentration waste gas inlet 102, and the upper sealing plate is provided with a mixed waste gas outlet 103. The structural forms of the upper sealing plate and the lower sealing plate can adopt flat cover plates, oval cover plates, semi-circular cover plates or dish-shaped cover plates etc. The cross-section of the cylinder body can be circular or square, preferably circular. The mixed waste gas distribution plate 11 is arranged in multiple levels and horizontally spaced in the cylinder body 10. For example, it can adopt the Figure 1 four-level setting shown, that is, a first-level mixed waste gas distribution plate 11A, a second-level mixed waste gas distribution plate 11B, a third-level mixed waste gas distribution plate 11C and a fourth-level mixed waste gas distribution plate 11D which are sequentially spaced from bottom to top. Half of the area of the mixed waste gas distribution plate 11 is provided with openings (that is, the first through holes 110), and the other half of the area is closed. The opening areas of adjacent levels are arranged staggeredly (for example, the first-level mixed waste gas distribution plate 11A is inFigure 1 The right side is open and the left side is closed in the [specific context]; the secondary mixed waste gas distribution plate 11B is Figure 1 open on the left side and closed on the right side in the [specific context], and so on), forming a zigzag flow channel for the mixed waste gas to flow upward. The high-concentration waste gas distribution pipe 12 is vertically arranged in the center of the cylinder body 10 and is fixedly arranged on the mixed waste gas distribution plate 11 through penetration. Further, the high-concentration waste gas distribution pipe 12 is arranged in a through manner within the cylinder body 10, with the upper end fixed on the upper sealing plate and the lower end communicating with the high-concentration waste gas inlet 102. Through holes (i.e., the second through holes 120) are uniformly formed on the wall surface of the high-concentration waste gas distribution pipe 12 for injecting high-concentration waste gas into the zigzag flow channel step by step. The cylinder body 10, the mixed waste gas distribution plate 11, and the high-concentration waste gas distribution pipe 12 of the present utility model are preferably made of carbon steel or stainless steel.

[0034] Adopting the above solution of the present utility model, through the multi-level setting and horizontal spaced arrangement of the mixed waste gas distribution plate, and staggering the openings of the distribution plates of adjacent layers, the channel of the mixed waste gas can be arranged as a zigzag flow channel, increasing the flow length of the mixed waste gas within a limited space, prolonging the mixing time, and enhancing the mass transfer effect; the vertical and through arrangement of the high-concentration waste gas distribution pipe can introduce high-concentration waste gas into the zigzag flow channels of different levels at different heights respectively, realizing the step-by-step and dispersed injection of high-concentration waste gas instead of injecting it all at once and mixing it with low-concentration waste gas, avoiding the excessive concentration of the mixed waste gas in local areas, ensuring that the concentration of the mixed waste gas in the whole area is lower than the lower explosion limit, and being safer and more reliable; some high-concentration waste gas flows out horizontally from the side walls at different heights of the high-concentration waste gas distribution pipe and flows into the zigzag flow channels of different levels, which can be fully diffused in the horizontal cross-section above the openings of the mixed waste gas distribution plate. When the high- and low-concentration waste gases flow relatively vertically, the large-flow low-concentration waste gas can carry the small-flow high-concentration waste gas and continue to flow, effectively enhancing the uniform mixing effect of the two.

[0035] Further, preferably but not restrictively, the high-concentration waste gas distribution pipe 12 can be a single-pipe structure (such as Figure 1 shown), or can be a multi-branch pipe structure (not shown in the figure). When adopting a multi-branch pipe structure, the pipe diameter is relatively smaller than that of a single pipe, and the gas flow in all directions can be more uniform, which is more conducive to the uniformity of injecting high-concentration waste gas into the zigzag flow channel and helps to improve the mixing uniformity. Whether adopting a single-pipe structure or a branch pipe structure, the number and total area of the openings of the pipe can be determined according to the gas volume of the high-concentration waste gas and the diameter of the high-concentration waste gas distribution pipe. When adopting a single-pipe structure, the number of openings along the circumferential direction of the pipe is preferably 4 - 6; the equivalent diameter of the opening is preferably 10 - 40 mm; the adjacent opening spacing is preferably 1.2 - 2 times the aperture.

[0036] Further, as shown in Figure 1 、 2As shown, the openings in half of the area of the mixed waste gas distribution plate 11 are evenly arranged; the number and total area of the openings are determined according to the gas volume of the mixed waste gas. The total opening area of each layer of the mixed waste gas distribution plate satisfies that the flow velocity of the mixed waste gas is 0.2 - 3 m / s. The flow velocity of the mixed waste gas is the same as that of the high-concentration waste gas flowing out of the high-concentration waste gas distribution pipe. The matching of the flow velocities can ensure further improvement of the mixing uniformity. The distance between adjacent mixed waste gas distribution plates 11 is preferably 0.3 - 1 times the radius of the inner cylinder.

[0037] When the high- and low-concentration organic waste gas mixing device of the present utility model works, the small-flow high-concentration waste gas enters the high-concentration waste gas distribution pipe 12 from the high-concentration waste gas inlet 102, and the large-flow low-concentration waste gas enters the cylinder body 10 from the low-concentration waste gas inlet 101. Part of the high-concentration waste gas flowing out of the second through hole 120 between the lower sealing plate and the first-stage mixed waste gas distribution plate 11A is mixed with the low-concentration waste gas for the first time in the first stage. When the mixed waste gas flows through the first through hole 110 of the first-stage mixed waste gas distribution plate 11A, the gas is redistributed to complete the second mixing in the first stage; part of the high-concentration waste gas flowing out of the second through hole 120 between the first-stage mixed waste gas distribution plate 11A and the second-stage mixed waste gas distribution plate 11B is mixed with the first-stage mixed waste gas to complete the first mixing in the second stage. When the mixed waste gas flows through the first through hole 110 of the second-stage mixed waste gas distribution plate 11B, the gas is redistributed to complete the second mixing in the second stage. According to the above rules, the mixed waste gas sequentially passes through the mixed waste gas distribution plates 11 of each layer and finally flows out from the mixed waste gas outlet 103. The high-concentration waste gas is injected into the mixed waste gas in multiple directions through the openings of the high-concentration waste gas distribution pipe 12 and can be fully diffused in the horizontal cross-section above and below the openings of the mixed waste gas distribution plate 11. Therefore, when the high- and low-concentration waste gases flow relatively vertically, the large-flow low-concentration waste gas carries the small-flow high-concentration waste gas to continue flowing, enhancing the uniform mixing effect of the two. At the same time, the mixed waste gas distribution plate 11 divides the mixed waste gas flow channel into several connected areas (i.e., the aforementioned baffle channels), which can increase the flow length of the mixed waste gas in a limited space, extend the mixing time, and enhance the mass transfer effect.

[0038] The high- and low-concentration organic waste gas mixing device of the present utility model has the characteristics of simple structure, small volume and floor area, and relatively uniform concentration distribution of the mixed waste gas, which is beneficial to the safe, efficient and stable operation of the subsequent organic waste gas treatment device, and is especially suitable for the occasions where the difference in the concentration and flow rate of the organic waste gas is relatively large.

[0039] The foregoing description of the specific exemplary embodiments of the present utility model is for the purposes of illustration and exemplification. These descriptions are not intended to limit the present utility model to the precise forms disclosed, and it is apparent that many changes and variations are possible in light of the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present utility model and its practical applications, so that those skilled in the art can implement and utilize the various different exemplary embodiments of the present utility model, as well as various different selections and changes. Any simple modifications, equivalent variations, and embellishments made to the above exemplary embodiments shall fall within the protection scope of the present utility model.

Claims

1. A high- and low-concentration organic waste gas mixing device, characterized in that: Used for mixing small flow high concentration exhaust gas with large flow low concentration exhaust gas, including: The cylinder body is formed by an upper sealing plate, a lower sealing plate and a cylinder wall; the lower sealing plate is provided with a low-concentration exhaust gas inlet and a high-concentration exhaust gas inlet, and the upper sealing plate is provided with a mixed exhaust gas outlet; A mixed exhaust gas distribution plate is arranged in multiple levels and arranged horizontally in the cylinder; half of the mixed exhaust gas distribution plate is open and the other half is closed, and the open areas of adjacent levels are arranged in a staggered manner to form a baffle channel for the mixed exhaust gas from bottom to top; The high-concentration exhaust gas distribution pipe is vertically arranged in the center of the cylinder and is fixed on the mixed exhaust gas distribution plate; the wall surface of the high-concentration exhaust gas distribution pipe is evenly provided with through holes for injecting high-concentration exhaust gas into the deflection channel in a step-by-step dispersed manner.

2. The high- and low-concentration organic waste gas mixing device according to claim 1 is characterized in that: The high-concentration exhaust gas distribution pipe is arranged through the cylinder, the upper end is fixed on the upper sealing plate, and the lower end is connected to the high-concentration exhaust gas inlet.

3. The high- and low-concentration organic waste gas mixing device according to claim 1 is characterized in that: The high-concentration exhaust gas distribution pipe is a single pipe structure or a plurality of branch pipe structures.

4. The high- and low-concentration organic waste gas mixing device according to claim 3 is characterized in that: The number of openings and the total area of ​​the pipeline are determined according to the volume of high-concentration exhaust gas and the diameter of the high-concentration exhaust gas distribution pipe.

5. The high- and low-concentration organic waste gas mixing device according to claim 4 is characterized in that: When a single pipe structure is used, the number of openings along the circumference of the pipe is 4 to 6; the equivalent diameter of the openings is 10 to 40 mm; and the spacing between adjacent openings is 1.2 to 2 times the hole diameter.

6. The high- and low-concentration organic waste gas mixing device according to claim 1 is characterized in that: The openings in half of the mixed exhaust gas distribution plate are evenly arranged; The number of openings and the total area are determined according to the volume of the mixed exhaust gas, and the total opening area of ​​each level of the mixed exhaust gas distribution plate satisfies the mixed exhaust gas flow rate of 0.2 to 3 m / s.

7. The high- and low-concentration organic waste gas mixing device according to claim 6 is characterized in that: The mixed exhaust gas flow rate is the same as the high-concentration exhaust gas flow rate flowing out of the high-concentration exhaust gas distribution pipe.

8. The high- and low-concentration organic waste gas mixing device according to claim 6, characterized in that: The distance between adjacent mixed exhaust gas distribution plates is 0.3 to 1 times the radius of the inner cylinder.

9. The high- and low-concentration organic waste gas mixing device according to claim 1, characterized in that: The upper sealing plate and the lower sealing plate are in the form of a flat sealing plate, an elliptical sealing plate, a semicircular sealing plate or a disc-shaped sealing plate.

10. The high- and low-concentration organic waste gas mixing device according to claim 1, characterized in that: The cylinder, the mixed exhaust gas distribution plate and the high-concentration exhaust gas distribution pipe are made of carbon steel or stainless steel.

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