A volatile organic compound condensing device

Abstract

The utility model relates to exhaust treatment technical field, and specifically volatile organic compound condensing device, including casing, one end wall of casing is equipped with waste gas inlet pipe, and the other end wall is equipped with waste gas outlet pipe, the casing is equipped with the baffle of radial extension, is equipped with a plurality of first holes on the baffle, and the baffle divides the inner chamber of casing into first cavity and second cavity, is equipped with the flow uniforming spare in the first cavity, and the flow uniforming spare includes a plurality of concentric setting conical cylinder, and the major diameter end of conical cylinder is fixed with the baffle, and the minor diameter end of conical cylinder corresponds with waste gas inlet pipe and has interval, and the interval between adjacent two conical cylinders gradually reduces from outside to inside, and the length of a plurality of conical cylinders gradually becomes short from outside to inside, and is equipped with at least one group of condensing pipe and trapping spare in the second cavity, and it is through the flow uniforming spare in the first cavity and the baffle cooperation, makes the waste gas after entering the casing and be evenly distributed, improves the condensing efficiency and improves gas-liquid separation effect.

Description

Technical Field

[0001] This utility model relates to the field of waste gas treatment technology, specifically to a volatile organic compound condensation device. Background Technology

[0002] Volatile organic compounds (VOCs) are a major component of air pollution and one of the most difficult substances to treat, making them one of the most important factors affecting air quality. While there are many methods for treating VOCs, only a few methods allow for the recovery of the substances; condensation is one such method. Condensation refers to the method of separating harmful components from waste gas by lowering its temperature, based on the principle that reducing the temperature of harmful gases causes some components to condense into liquids. Existing condensation devices for separating water-soluble VOCs from waste gas typically have a condenser installed inside a waste gas flow channel. The waste gas passing through the condenser is cooled below its dew point temperature, and the condensation of the VOCs themselves, along with the adsorption of condensed water droplets, separates the water-soluble VOCs contained in the waste gas. Patent application CN201810198300.3 discloses a condenser for VOCs treatment, which increases the heat exchange surface area by using a high-area metal wire mesh tube on the heat exchange tubes, resulting in a larger liquid adhesion area below the dew point and facilitating liquid condensation. However, with this method, the exhaust gas is directly introduced into the inner cavity of the shell through the inlet pipe. Due to the influence of the pipeline structure and airflow inertia, the exhaust gas concentrates through the channel in the middle of the shell, resulting in a large difference in flow rate on the windward side of the condenser tube bundle. The flow velocity in the central area is too high and the tube bundle is overloaded, while the tube bundle in the peripheral area is underutilized. Some areas experience overcooling or waste of cooling capacity, resulting in a decrease in overall heat exchange efficiency and unstable condensation effect. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a volatile organic compound condensation device, which divides the shell into a first chamber and a second chamber. The flow equalization element and the baffle in the first chamber work together to make the exhaust gas evenly distributed after entering the shell, thereby improving the condensation efficiency and the gas-liquid separation effect.

[0004] This utility model provides a volatile organic compound condensation device to solve the above-mentioned technical problems. The device includes a shell, with a waste gas inlet pipe on one end wall, a waste gas outlet pipe on the other end wall, and a liquid outlet pipe at the bottom. A radially extending partition is provided inside the shell, with several first holes on the partition. The partition divides the inner cavity of the shell into a first cavity and a second cavity. A flow equalization element is provided in the first cavity, comprising multiple concentrically arranged conical cylinders. The large-diameter end of each conical cylinder is fixed to the partition, and the small-diameter end of each conical cylinder corresponds to and is spaced from the waste gas inlet pipe. The distance between two adjacent conical cylinders decreases sequentially from the outside to the inside, and the length of each conical cylinder decreases sequentially from the outside to the inside. The second cavity contains at least one set of condenser pipes and a collection element.

[0005] Furthermore, the innermost conical cylinder also contains concentrically arranged cones, the axis of which is coaxial with the axis of the exhaust gas inlet pipe.

[0006] Furthermore, the condenser tubes are arranged in a serpentine pattern within the second cavity, with the medium inlet of the condenser tubes located on the side of the housing closest to the exhaust gas outlet, and the medium outlet of the condenser tubes located on the side of the housing closest to the exhaust gas inlet.

[0007] Furthermore, the condenser tube is provided with heat-conducting fins.

[0008] Furthermore, the trapping element employs a multi-layered wire mesh, which is arranged radially along the second cavity.

[0009] Furthermore, the bottom inner wall of the housing is provided with an inclined liquid collection tank, and the liquid outlet pipe is located at the bottom end of the liquid collection tank.

[0010] Furthermore, a filter plate is also provided on the side of the second cavity near the partition.

[0011] The beneficial effects of this invention are as follows: A partition inside the casing divides the internal space into a first cavity and a second cavity. A flow equalization element composed of multiple concentric cones is installed in the first cavity, with the length of the cones decreasing sequentially from the outside to the inside, and the distance between adjacent cones decreasing sequentially from the outside to the inside. When exhaust gas enters the first cavity from the exhaust gas inlet pipe, the innermost cone faces the incoming flow direction. The airflow first collides with the innermost cone, is forced to sharply deflect along the cone surface, and diffuses radially outward. It is then intercepted by the outer cones, with some airflow squeezed into the annular gap between adjacent cones, and some continuing to diffuse outward, thus gradually dispersing the airflow entering from the center of the casing. Because the distance between adjacent conical cylinders decreases from the outside to the inside, the gap between the inner rings of adjacent conical cylinders is smaller, resulting in greater resistance and a surge in flow velocity when airflow passes through. This also facilitates the forced compression of excess exhaust gas towards the outer ring. Meanwhile, the increased gap in the outer ring creates an airflow channel with gradually decreasing resistance, counteracting the situation of "large flow at the center and small flow at the periphery," thus achieving automatic compensation and balance of the radial flow of exhaust gas. In other words, this flow equalization component intercepts and guides the concentrated airflow passing through the center in stages, causing the exhaust gas to be evenly distributed radially to all parts of the baffle. The exhaust gas has already formed a uniformly pressured annular static pressure zone in the first chamber, and then enters the second chamber evenly through several first holes on the baffle. This invention features a simple structure and low cost. It effectively eliminates the phenomenon of concentrated exhaust gas impacting the central tube bundle in traditional devices, making the flow distribution on the windward side of the condenser tube more uniform. This avoids the waste of cooling capacity caused by local overcooling and the problem of insufficient condensation caused by local overload, significantly improving the overall heat exchange efficiency of the condenser tube and helping to increase the condensation recovery rate of volatile organic compounds.

[0012] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the cross-sectional structure of the present invention; Figure 2 This is a schematic diagram of the flow divider of this utility model; Figure 3 This is a schematic diagram of the shell structure of this utility model.

[0014] In the attached diagram: 100-shell, 110-exhaust gas inlet pipe, 120-exhaust gas outlet pipe, 130-liquid outlet pipe, 140-liquid collection tank, 200-partition plate, 210-first hole, 300-flow equalization element, 310-conical cylinder, 320-cone, 400-condenser pipe, 410-medium inlet pipe, 420-medium outlet pipe, 500-collecting element, 600-filter plate. Detailed Implementation

[0015] Referring to the accompanying drawings, the specific embodiments of this utility model will be described in detail.

[0016] Reference Figures 1 to 3 This utility model provides an embodiment of a volatile organic compound condensation device.

[0017] A volatile organic compound (VOC) condensation device includes a shell 100, a partition 200, a flow equalization element 300, a condenser tube 400, and a collection element 500. One end wall of the shell 100 is provided with a waste gas inlet pipe 110, the other end wall with a waste gas outlet pipe 120, and the bottom with a liquid outlet pipe 130. The waste gas inlet pipe 110 is connected to an air pump, which pumps the waste gas to be treated into the shell 100. The waste gas outlet pipe 120 can be connected to other waste gas treatment equipment or to an exhaust pipe, depending on whether the treated waste gas meets emission standards. The liquid outlet pipe 130 at the bottom is used to discharge liquid containing VOCs for further treatment in other equipment.

[0018] The housing 100 is provided with a radially extending partition 200, which may be a thin plate. The partition 200 has several first holes 210, dividing the inner cavity of the housing 100 into a first cavity and a second cavity. Waste gas entering the housing 100 is uniformly distributed in the first cavity and then flows evenly into the second cavity through the first holes 210 of the partition 200, ensuring uniform airflow distribution within the second cavity. The second cavity is used for condensing the waste gas, causing volatile organic compounds to condense into a liquid state and separate from the waste gas for recovery. In this application, a single-stage condensation is used. Multiple stages can be connected in series as needed, allowing the temperature of each stage to gradually decrease, facilitating multi-stage separation of complex waste gases.

[0019] The first cavity is equipped with a flow equalization element 300, which includes a plurality of concentrically arranged conical cylinders 310. The large-diameter end of each conical cylinder 310 is fixed to the partition plate 200, and the small-diameter end of each conical cylinder 310 corresponds to and is spaced from the exhaust gas inlet pipe 110. The distance between two adjacent conical cylinders 310 decreases from the outside to the inside, and the length of each conical cylinder 310 decreases from the outside to the inside. When exhaust gas enters the first cavity from the exhaust gas inlet pipe 110, the innermost conical cylinder 310 faces the incoming flow direction. The airflow first collides with the innermost conical cylinder 310 and is forced to turn sharply back along the conical surface, spreading radially outward. Then it is intercepted by the outer conical cylinders 310. Part of the airflow is squeezed into the annular gap between adjacent conical cylinders 310, and part continues to spread outward, thus dispersing the airflow entering from the center of the shell 100 step by step. Furthermore, the innermost conical cylinder 310 is also concentrically arranged with cones 320. The axis of the cones 320 is coaxial with the axis of the exhaust gas inlet pipe 110. This can fill the hollow area in the center of multiple conical cylinders 310, so that the airflow in the central area is forced to flow outward along the surface of the cones 320, fundamentally eliminating the possibility of the central airflow directly impacting the baffle 200.

[0020] Since the distance between adjacent conical cylinders 310 decreases from the outside to the inside, the gap between the inner rings of adjacent conical cylinders 310 is smaller, resulting in greater resistance and a surge in flow velocity when the airflow passes through. This also facilitates the forced compression of excess exhaust gas to the outer ring. Meanwhile, the increased gap in the outer ring allows the airflow to pass through an airflow channel with gradually decreasing resistance, which can counteract the situation of "large flow in the center and small flow in the periphery" and achieve automatic compensation and balance of the radial flow of exhaust gas.

[0021] The second cavity is equipped with at least one set of condenser tubes 400 and a collector 500. When the exhaust gas carrying condensate droplets flows through the collector 500, the droplets are effectively intercepted and converge along the surface of the collector 500, dripping to the bottom of the shell 100 and discharged for recycling through the outlet pipe 130. The synergistic effect of the collector 500 and the flow equalization device 300 ensures both smooth airflow and efficient condensate collection, reducing the content of volatile organic compounds and the amount of droplets carried in the outlet gas, and improving the resource recovery rate. Furthermore, a filter plate 600 is also provided on the side of the second cavity near the partition 200. The pore size of the filter plate is smaller than that of the first hole on the partition plate to form a stepped filtration. This can filter the dust in the airflow entering the second cavity, reducing the possibility of it depositing on the condenser tubes 400 and the wire mesh, ensuring the heat transfer efficiency of the condenser tubes 400, and preventing dust and liquid from mixing and forming blockages that clog the wire mesh.

[0022] Furthermore, the condenser tube 400 is arranged in a serpentine pattern within the second cavity, significantly extending the flow path of the refrigerant within the shell 100. This increases the contact time and heat exchange area between the refrigerant and the exhaust gas, allowing the refrigerant to fully absorb heat from the exhaust gas within the tube. Furthermore, the condenser tube 400 is equipped with heat-conducting fins, further increasing the heat exchange area. The medium inlet pipe 410 of the condenser tube 400 is located on the side of the shell 100 near the exhaust gas outlet pipe 120, and the medium outlet pipe 420 of the condenser tube 400 is located on the side of the shell 100 near the exhaust gas inlet pipe 110. This constitutes counter-current heat exchange, where the temperature of the exhaust gas gradually decreases along the flow direction, while the temperature of the refrigerant gradually increases along the opposite direction. This ensures that the initial inlet section does not experience thermal shock due to excessive temperature difference, and that the outlet section reaches the required low condensation temperature.

[0023] Furthermore, the trapping element 500 employs a multi-layered wire mesh, which is arranged radially along the second cavity. When droplets pass through the wire mesh with the airflow, they are intercepted. The captured tiny droplets adhere to the wire mesh surface, gradually accumulating and growing. When the droplet's gravity exceeds its surface tension, it slides down the wire mesh and eventually drips into the collection tank 140 at the bottom of the housing 100 for discharge. Furthermore, the inner wall at the bottom of the housing 100 is provided with an inclined collection tank 140, and the outlet pipe 130 is located at the bottom end of the collection tank 140 to facilitate the discharge of condensed liquid within the housing 100.

[0024] By adopting this utility model, the phenomenon of concentrated exhaust gas impacting the central tube bundle in traditional devices is effectively eliminated, making the flow distribution on the windward side of the condenser tube 400 more uniform. This avoids the waste of cooling capacity caused by local overcooling and the problem of insufficient condensation caused by local overload, significantly improving the overall heat exchange efficiency of the condenser tube 400 and helping to improve the condensation recovery rate of volatile organic compounds.

[0025] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0026] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A volatile organic compound condensation device, characterized in that, Includes a housing (100), with an exhaust gas inlet pipe (110) on one end wall, an exhaust gas outlet pipe (120) on the other end wall, and a liquid outlet pipe (130) at the bottom. The housing (100) is provided with a radially extending partition (200), and the partition (200) is provided with a plurality of first holes (210). The partition (200) divides the inner cavity of the housing (100) into a first cavity and a second cavity. The first cavity is provided with a flow equalization element (300), which includes a plurality of concentrically arranged conical cylinders (310). The large-diameter end of the conical cylinder (310) is fixed to the partition plate (200), and the small-diameter end of the conical cylinder (310) corresponds to and is spaced from the exhaust gas inlet pipe (110). The distance between two adjacent conical cylinders (310) decreases from the outside to the inside, and the length of the plurality of conical cylinders (310) decreases from the outside to the inside. The second cavity is provided with at least one set of condenser tubes (400) and collectors (500).

2. The volatile organic compound condensation device according to claim 1, characterized in that, The innermost conical cylinder (310) also contains a concentric cone (320), the axis of which is coaxial with the axis of the exhaust gas inlet pipe (110).

3. The volatile organic compound condensation device according to claim 1, characterized in that, The condenser tube (400) is arranged in a serpentine pattern within the second cavity. The medium inlet pipe (410) of the condenser tube (400) is located on the side of the housing (100) near the exhaust gas outlet pipe (120), and the medium outlet pipe (420) of the condenser tube (400) is located on the side of the housing (100) near the exhaust gas inlet pipe (110).

4. The volatile organic compound condensation device according to claim 3, characterized in that, The condenser tube (400) is provided with heat-conducting fins.

5. The volatile organic compound condensation device according to claim 1, characterized in that, The trapping element (500) is made of a multi-layered wire mesh, which is arranged radially along the second cavity.

6. The volatile organic compound condensation device according to claim 1, characterized in that, The bottom inner wall of the housing (100) is provided with an inclined liquid collection tank (140), and the liquid outlet pipe (130) is located at the bottom end of the liquid collection tank (140).

7. The volatile organic compound condensation device according to claim 1, characterized in that, A filter plate (600) is also provided on the side of the second cavity near the partition (200).

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