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, an upper sealing plate, a lower sealing plate and a cylinder wall, the lower sealing plate is provided with a high-concentration waste gas inlet, the lower part of the cylinder is provided with a tangential low-concentration waste gas inlet, and the upper part of the cylinder is provided with a tangential mixed waste gas outlet; a spiral flow guide plate is arranged in the cylinder body and is used for guiding airflow from the low-concentration waste gas inlet to the mixed waste gas outlet; the high-concentration waste gas distribution pipe is composed of a main pipe vertically arranged in the center of the barrel in a penetrating mode and multiple sets of branch pipes, the multiple sets of branch pipes are arranged in a layered mode, each set of branch pipes extend in the horizontal direction, the branch pipes are arranged in the tangential direction of the main pipe, and holes are formed in the branch pipes; the main pipe is in a free rotating state, and high-concentration waste gas sprayed by the branch pipe reversely drives the main pipe to rotate; and the sprayed high-concentration waste gas is locally opposite to the low-concentration waste gas running on the guide plate in direction. According to the utility model, the concentration distribution of mixed waste gas is more uniform.

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 oxidation asphalt tail gas, reforming catalyst regeneration flue gas, and oxidation desulfurization alcohol tail gas, also includes a large amount of unorganized source waste gas, which needs to be properly enclosed, collected, and centrally treated before being discharged up to standard. 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 sudden high and low change. However, even during the low emission period, the VOCs concentration emitted 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 wastewater biological 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 standard. 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 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 shell, 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 bursting disc is installed on the shell; 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, and there are certain safety hazards.

[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 especially suitable for occasions where the concentration difference and flow difference of organic waste gas are relatively large.

[0009] To achieve the above object, the present utility model provides a device for mixing high and low concentration organic waste gases, which is particularly suitable for mixing small-flow high-concentration waste gases with large-flow low-concentration waste gases, 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 high-concentration waste gas inlet, the lower part of the cylinder body is provided with a tangential low-concentration waste gas inlet, and the upper part of the cylinder body is provided with a tangential mixed waste gas outlet; a spiral rising guide plate is arranged inside the cylinder body for guiding the air flow from the low-concentration waste gas inlet to the mixed waste gas outlet; a high-concentration waste gas distribution pipe, which is composed of a main pipe vertically penetrating through the center of the cylinder body and multiple groups of branch pipes, the multiple groups of branch pipes are arranged in layers and each group of branch pipes extends in the horizontal direction, the branch pipes are arranged tangentially along the main pipe and openings are provided on the branch pipes; the main pipe is in a freely rotating state, and the high-concentration waste gas ejected from the branch pipes drives the main pipe to rotate in the reverse direction; the ejected high-concentration waste gas is locally in the opposite direction to the low-concentration waste gas flowing on the guide plate.

[0010] Further, in the above technical solution, the main pipe can be connected by bearings fixed on the upper sealing plate and the lower sealing plate.

[0011] Further, in the above technical solution, the number of each group of branch pipes in each layer can be 3 to 6 and they are evenly spaced in the horizontal direction. The length of each group of branch pipes is preferably gradually decreasing from bottom to top.

[0012] Further, in the above technical solution, the equivalent diameter of the cross-section of the branch pipe can be 40 to 200 mm, and the total opening area of all the branch pipes satisfies that the high-concentration waste gas flow rate is 10 to 30 m / s.

[0013] Further, in the above technical solution, the distance between two groups of branch pipes in adjacent layers can be 15 to 20 mm; the average length of each group of branch pipes is preferably gradually decreasing by 5% to 20% from bottom to top.

[0014] Further, in the above technical solution, it is preferred that the projection of each branch pipe on the horizontal plane does not overlap.

[0015] Further, in the above technical solution, the low-concentration waste gas inlet pipe is such that the low-concentration waste gas flow rate is the same as the high-concentration waste gas flow rate ejected from the branch pipes.

[0016] Further, in the above technical solution, the cylinder body is preferably in the shape of a frustum of a cone; 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, etc.

[0017] Further, in the above technical solution, the cylinder body and the high-concentration waste gas distribution pipe are preferably made of carbon steel or stainless steel.

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

[0019] 1) The utility model can increase the flow length of the mixed exhaust gas in a limited space through the design of the spiral rising guide plate in the cylinder, prolong the mixing time and enhance the mass transfer effect;

[0020] 2) The vertical and through arrangement of the main pipe of the high-concentration exhaust gas distribution pipe of the utility model and the tangential horizontal extension design of the branch pipe can respectively introduce high-concentration exhaust gas into the spiral channels constructed by the guide plates at different heights in different directions, so as to disperse and inject high-concentration exhaust gas into the cylinder, instead of injecting all of it at one location at one time to mix with low-concentration exhaust gas, thus avoiding excessively high concentration of mixed exhaust gas in a local area, and ensuring that the concentration of mixed exhaust gas in the entire area is lower than the lower explosion limit, which is safer and more reliable;

[0021] 3) The local injection direction of the high-concentration exhaust gas ejected from the branch pipe of the utility model is opposite to the spiral direction of the low-concentration exhaust gas running in the spiral channel constructed by the guide plate, so that the two concentrations of exhaust gas can form a countercurrent locally, and the relative speed during the counter-convection collision can be guaranteed to be a larger value, which can effectively enhance the turbulence degree in the collision area and improve the mass transfer efficiency between high-concentration and low-concentration exhaust gases; since the overall flow rate of low-concentration exhaust gas is large, the airflow after the collision (that is, the mixed exhaust gas) can still rise along the guide plate spirally and finally run to the mixed exhaust gas outlet for discharge;

[0022] 4) The layered arrangement of the branch pipes of the utility model and the extension of multiple branch pipes in each layer in different directions can not only inject high-concentration exhaust gas at different heights, but also face all directions to ensure the uniformity of injection; in addition, by setting the length of each group of branch pipes to decrease layer by layer from bottom to top, more high-concentration exhaust gas can be injected at the bottom of the cylinder, so that this part of high-concentration exhaust gas can be mixed with low-concentration exhaust gas for a longer time, thereby improving the overall mixing effect; the projections of each branch pipe on the horizontal plane do not overlap, which can maximize the uniformity of high-concentration exhaust gas injection in all directions;

[0023] 5) The utility model can make the low-concentration exhaust gas inlet pipe meet the same flow rate of low-concentration exhaust gas as the high-concentration exhaust gas ejected from the branch pipe, and can make the relative speed of the two exhaust gases reach the maximum value at the moment of collision, thereby further enhancing the turbulence degree of the collision area;

[0024] 6) The high- and low-concentration organic waste gas mixing device of the utility model has a simple structure, small size and footprint, and does not require the use of a homogenizer, which can save investment and operating costs; the relatively uniform distribution of waste gas concentration after mixing is conducive to the safe, efficient and stable operation of subsequent organic waste gas treatment devices, and is especially suitable for occasions where the organic waste gas concentrations differ greatly and the flow rates differ greatly (that is, the mixing of small-flow high-concentration waste gas with large-flow low-concentration waste gas).

[0025] 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 implemented 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. Brief Description of the Drawings

[0026] Figure 1 It is a schematic internal structure diagram of the high-low concentration organic waste gas mixing device of the present utility model.

[0027] Figure 2 is Figure 1 a top view schematic diagram of

[0028] Figure 3 is Figure 1 a cross-sectional schematic diagram of

[0029] Main reference numeral description:

[0030] 1 - mixing device, 10 - cylinder body, 101 - low-concentration waste gas inlet, 102 - high-concentration waste gas inlet, 103 - mixed waste gas outlet, 104 - upper sealing plate, 105 - lower sealing plate, 106 - deflector plate, 11A - upper bearing, 11B - lower bearing, 12 - high-concentration waste gas distribution pipe, 121 - main pipe, 122 - branch pipe. Detailed Description of the Preferred Embodiments

[0031] The following will describe in detail the specific embodiments of the present utility model with reference to the accompanying drawings, but it should be understood that the protection scope of the present utility model is not limited by the specific embodiments.

[0032] Unless otherwise clearly stated, throughout the specification and claims, the term "comprising" or its variations such as "comprises" or "including" etc. will be understood to include the stated elements or components, without excluding other elements or other components.

[0033] In this article, for the convenience of description, spatial relative terms such as "below", "beneath", "under", "above", "over", "on" etc. may be used to describe the relationship between one element or feature and another element or feature in the drawings. It should be understood that the spatial relative terms are intended to cover different directions of the object in use or operation in addition to the directions depicted in the drawings. For example, if the object in the drawing is flipped, the element described as "below" or "beneath" another element or feature will be oriented "above" the said element or feature. Therefore, the exemplary term "below" can include both the below and above 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.

[0034] In this text, terms such as "first", "second", etc. are used to distinguish two different components or parts, rather than to define a specific position or relative relationship. In other words, in some embodiments, terms such as "first", "second", etc. can also be interchanged with each other.

[0035] As Figures 1 to 3 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 and a high-concentration waste gas distribution pipe 12. Among them, the cylinder body 10 is enclosed by an upper sealing plate 104, a lower sealing plate 105 and a cylinder wall. The cylinder body can be a cylindrical or frustum-shaped structure, preferably a frustum-shaped structure, and 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, etc. The lower sealing plate 105 is provided with a high-concentration waste gas inlet 102, the lower part of the cylinder body 10 is provided with a tangential low-concentration waste gas inlet 101, and the upper part of the cylinder body 10 is provided with a tangential mixed waste gas outlet 103. A spiral rising deflector 106 is arranged in the cylinder body 10 for guiding the air flow from the low-concentration waste gas inlet 101 to the mixed waste gas outlet 103. The high-concentration waste gas distribution pipe 12 is composed of a main pipe 121 vertically penetrating through the center of the cylinder body 10 and multiple groups of branch pipes 122. The multiple groups of branch pipes 122 are arranged in layers and each group of branch pipes extends in the horizontal direction. The branch pipes 122 are arranged tangentially along the main pipe 121 and openings are formed on the branch pipes (not shown in the figure). The main pipe 121 is in a freely rotatable state (preferably using the main pipe 121 as the rotation axis and connected by bearings fixed on the upper and lower sealing plates, that is, the upper bearing 11A and the lower bearing 11B), and the high-concentration waste gas ejected from the branch pipes 122 can reversely drive the main pipe 121 to rotate. The high-concentration waste gas ejected from the branch pipes is locally in the opposite direction to the low-concentration waste gas flowing on the deflector 106. The cylinder body 10 and the high-concentration waste gas distribution pipe 12 of the present utility model are preferably made of carbon steel or stainless steel.

[0036] Adopting the above technical solution of the present utility model, through the design of the guide plate spirally rising inside the cylinder body, the flow length of the mixed waste gas can be increased within a limited space, the mixing time can be prolonged, and the mass transfer effect can be enhanced; the vertical and through setting of the main pipe of the high-concentration waste gas distribution pipe and the tangential horizontal extension design of the branch pipes can introduce high-concentration waste gas into the spiral channels constructed by the guide plates at different heights in different directions, realizing the dispersed injection of high-concentration waste gas inside the cylinder body, rather than injecting and mixing with low-concentration waste gas all at once in one position, avoiding the excessive concentration of the mixed waste gas in a local area, 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; the local injection direction of the high-concentration waste gas ejected from the branch pipes is opposite to the direction of the low-concentration waste gas flowing in the spiral channel constructed by the guide plates, so that the waste gases of the two concentrations can form a countercurrent locally, and the relative speed during the reverse convective impact can ensure a relatively large value, effectively enhancing the turbulence degree of the impact area and improving the mass transfer efficiency between the high- and low-concentration waste gases; due to the large overall flow rate of the low-concentration waste gas, the overall airflow (i.e., the mixed waste gas) after the collision can still spiral upward along the guide plate and finally run to the mixed waste gas outlet for discharge.

[0037] Further as Figure 1 , 3 shown, the number of each group of branch pipes 122 in each layer is 3 to 6 ([ Figure 3 4 are set in each layer in [ Figure 3 shown) and are evenly spaced in the horizontal direction. The number of groups of branch pipes 122 (i.e., the number of layers) is determined according to the height of the cylinder body 10 and the spacing between the branch pipes. As Figure 3 shown, the 4 branch pipes 122 in each layer are all tangent to the main pipe 121, and the included angle between adjacent branch pipes is 90°. Preferably but not restrictively, the length of each group of branch pipes 122 decreases layer by layer from bottom to top. The preferred distance between two groups of branch pipes in adjacent layers is 15 to 20 mm; the average length of each group of branch pipes preferably decreases by 5% to 20% layer by layer from bottom to top. Through such a setting method, not only can high-concentration waste gas be injected at different heights, but also the injection direction is facing all directions, ensuring the uniformity of injection; in addition, through the setting method that the length of each group of branch pipes decreases layer by layer from bottom to top, more high-concentration waste gas can be injected at the bottom of the cylinder body, enabling this part of the high-concentration waste gas to have a longer mixing time with the low-concentration waste gas, thereby improving the overall mixing effect. The lengths of the branch pipes 122 in the same group can be the same or can vary within the corresponding length range; the number of branch pipes in each group can be the same or different. Further as Figure 3 shown, the projections of each branch pipe 122 on the horizontal plane do not overlap, so as to ensure the uniformity of the injection of high-concentration waste gas in all directions to the greatest extent.

[0038] Furthermore, the cross-section of the branch pipe can be circular, square, rhombic, elliptical, etc. Circular and elliptical shapes are preferred. The equivalent diameter of the cross-section of the branch pipe is preferably 40 - 200 mm. The total opening area of all branch pipes satisfies a high-concentration waste gas flow velocity of 10 - 30 m / s. The low-concentration waste gas inlet pipe satisfies the same flow velocity of the low-concentration waste gas as that of the high-concentration waste gas ejected from the branch pipes. Through such a setting method, the relative velocity of the two can reach the maximum value at the moment when the two kinds of waste gases with different concentrations collide, thereby further enhancing the turbulence degree in the collision area.

[0039] When the high- and low-concentration waste gas mixing device of the present utility model works, a large flow of low-concentration waste gas enters the cylinder body 10 tangentially from the low-concentration waste gas inlet 101 and continues to flow spirally upward along the spiral channel constructed by the guide plate 106; at the same time, a small flow of high-concentration waste gas enters the main pipe 121 of the high-concentration waste gas distribution pipe 12 from the high-concentration waste gas inlet 102, and then is ejected through the branch pipes 122. Due to the relatively high velocity of the high-concentration waste gas, a relatively large reverse pushing force is generated on the high-concentration waste gas distribution pipe 12, causing the overall rotation of the distribution pipe, and driving the high-concentration waste gas to be in a divergent state while rotating. Since the rotation directions of each group of branch pipes 122 are opposite to that of the low-concentration waste gas inlet pipe, the local flow rotation directions of the high-concentration waste gas and the low-concentration waste gas are also opposite. When the two flow in opposite directions and collide, the relative velocity reaches the maximum value, enhancing the turbulence degree in the collision area and improving the mass transfer efficiency between the high- and low-concentration waste gases; moreover, the branch pipes 122 of the high-concentration waste gas distribution pipe extend in different directions in the horizontal direction, enabling the high-concentration waste gas to be ejected in different directions, so it can be fully diffused within the horizontal cross-section, enhancing the uniform mixing effect of the two. The mixed waste gas flows out from the mixed waste gas outlet 103 of the cylinder body 10 along the tangential direction.

[0040] 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 mixed waste gas concentration, which is beneficial to the safe, efficient and stable operation of subsequent organic waste gas treatment devices, and is especially suitable for occasions where the difference in organic waste gas concentration and flow rate is relatively large.

[0041] The foregoing description of 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 obvious that many changes and variations can be made 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 various different exemplary embodiments of the present utility model, as well as various different selections and changes. Any simple modifications, equivalent variations and modifications 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 is formed by an upper sealing plate, a lower sealing plate and a cylinder wall; the lower sealing plate is provided with a high-concentration exhaust gas inlet, the lower part of the cylinder is provided with a tangential low-concentration exhaust gas inlet, and the upper part of the cylinder is provided with a tangential mixed exhaust gas outlet; a spiral ascending guide plate is provided in the cylinder to guide the airflow from the low-concentration exhaust gas inlet to the mixed exhaust gas outlet; The high-concentration exhaust gas distribution pipe is composed of a main pipe vertically penetrating the center of the cylinder and multiple groups of branch pipes. The multiple groups of branch pipes are arranged in layers and each group of branch pipes extends in the horizontal direction. The branch pipes are arranged tangentially along the main pipe and have holes on the branch pipes. The main pipe is in a free rotation state, and the high-concentration exhaust gas ejected from the branch pipe drives the main pipe to rotate in the reverse direction. The ejected high-concentration exhaust gas is locally opposite to the low-concentration exhaust gas running on the guide plate.

2. The high- and low-concentration organic waste gas mixing device according to claim 1 is characterized in that: The main pipe is connected via bearings fixed on the upper sealing plate and the lower sealing plate.

3. The high- and low-concentration organic waste gas mixing device according to claim 1 is characterized in that: The number of branch pipes in each group of each layer is 3 to 6 and they are evenly spaced in the horizontal direction.

4. The high- and low-concentration organic waste gas mixing device according to claim 3 is characterized in that: The length of each group of branch pipes decreases layer by layer from bottom to top.

5. The high- and low-concentration organic waste gas mixing device according to claim 4 is characterized in that: The equivalent diameter of the branch pipe cross section is 40 to 200 mm, and the total opening area of ​​all branch pipes satisfies the high-concentration exhaust gas flow rate of 10 to 30 m / s.

6. The high- and low-concentration organic waste gas mixing device according to claim 4 is characterized in that: The distance between two groups of branch pipes in adjacent layers is 15 to 20 mm; the average length of each group of branch pipes decreases by 5% to 20% from bottom to top.

7. The high- and low-concentration organic waste gas mixing device according to claim 4 is characterized in that: The projections of each branch pipe on the horizontal plane do not overlap.

8. The high- and low-concentration organic waste gas mixing device according to claim 5, characterized in that: The low-concentration exhaust gas inlet connection pipe satisfies that the flow rate of the low-concentration exhaust gas is the same as the flow rate of the high-concentration exhaust gas ejected from the branch pipe.

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

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

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