Tail gas treatment system

Abstract

The utility model discloses a tail gas treatment system with high efficiency and strong adaptability, which is formed by connecting a tail gas collecting device, a centrifugal pressurizing conveying device, a tail gas separating tank, a catalytic reaction device and an exhaust chimney in series through a flange type pipeline, and can be directly and additionally arranged on any tank body generating tail gas without a large production line. The tail gas treatment system is rapidly integrated to an existing production line, the equipment modification time is shortened to be within 72 hours from original two months, the time cost is remarkably reduced, meanwhile, the organic matter recovery rate is increased, and the win-win situation of economic benefits and environmental benefits is achieved.

Description

Technical Field

[0001] This utility model relates to the field of exhaust gas treatment technology, specifically an exhaust gas treatment system. Background Technology

[0002] Phenol and acetone are important chemical raw materials. The exhaust gas generated during their production contains high concentrations of phenol, acetone, and trace amounts of aldehydes and ketones. Direct emission of these pollutants not only wastes resources but also causes environmental pollution. Currently, the industry generally adopts end-of-pipe treatment methods, which require the installation of equipment such as condensers and separators on fixed production lines. However, existing production lines have large-scale equipment, fixed process layouts, and complex separator structures. Traditional retrofitting methods suffer from poor equipment compatibility, long construction periods, high retrofitting costs, and low recovery efficiency, resulting in the waste of organic matter and environmental pollution. Utility Model Content

[0003] To address the aforementioned challenges, this invention provides an exhaust gas treatment system comprising an exhaust gas collection device, a centrifugal pressurization and conveying device, an exhaust gas separator, a catalytic reaction device, and an exhaust chimney connected in series via flanged pipes. The exhaust gas separator has a drain port at its bottom, which is connected to a waste liquid recovery tank via a pipe. The exhaust gas separator is equipped with multiple baffle assemblies along the gas flow direction. The baffle assemblies are electrically connected to a controller and a cooler. Each baffle assembly includes a baffle body, and the bottom heights of the multiple baffle bodies are distributed in a progressively decreasing manner, thereby dividing the exhaust gas separator into multiple condensation chambers with different temperature gradients. Each baffle body is provided with micropores.

[0004] Preferably, the thickness of the baffle body is 1~10mm.

[0005] Preferably, the micropore size is 200~500μm.

[0006] Preferably, the surface of the microporous channels is coated with a hydrophobic polytetrafluoroethylene coating.

[0007] Preferably, the height of the top of the multiple baffle bodies is distributed in a progressively increasing manner along the gas flow direction.

[0008] Preferably, the tops of multiple baffle bodies are set at the same horizontal height.

[0009] Preferably, the baffle assembly further includes a rotating shaft and an angle adjusting component. The rotating shaft is placed inside the exhaust gas separator and extends through the top of the exhaust gas separator before being connected to the angle adjusting component located at the top of the exhaust gas separator. The baffle body is located inside the exhaust gas separator and fixed to the rotating shaft.

[0010] Preferably, the angle adjustment component is a stepper motor or a drive motor.

[0011] Preferably, a sealing ring is provided between the rotating shaft and the exhaust gas separator.

[0012] Preferably, the baffle body is equipped with a temperature sensor, a humidity sensor and a gas concentration sensor.

[0013] The beneficial effects are as follows: This application provides a highly efficient and adaptable exhaust gas treatment system that can be directly installed on any tank that generates exhaust gas without major changes to the production line. This allows the exhaust gas treatment system to be quickly integrated into the existing production line, reducing the equipment modification time from the original two months to less than 72 hours. This significantly reduces time costs while improving the organic matter recovery rate, achieving a win-win situation for both economic and environmental benefits. Attached Figure Description

[0014] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0015] Figure 1 This is a schematic diagram of the exhaust gas treatment system of this application;

[0016] In the diagram: 1. Exhaust gas collection device; 2. Centrifugal booster conveying device; 3. Exhaust gas separator; 31. Baffle body; 32. Rotating shaft; 33. Angle adjustment component; 4. Waste liquid recovery tank; 5. Catalytic reaction device; 6. Exhaust chimney. Detailed Implementation

[0017] The following drawings will disclose several embodiments of this utility model. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit this utility model. That is, in some embodiments of this utility model, these practical details are not essential. In addition, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0018] It should be noted that all directional indicators in this utility model embodiment, such as up, down, left, right, front, back, etc., are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indicator will also change accordingly.

[0019] Furthermore, in this utility model, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the utility model. They are merely used to distinguish components or operations described with the same technical terms and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0020] Example

[0021] Please see Figure 1 , Figure 1 This is a schematic diagram of the exhaust gas treatment system of this application. This application provides an exhaust gas treatment system, consisting of an exhaust gas collection device 1, a centrifugal booster conveying device 2, an exhaust gas separator 3, a catalytic reaction device 5, and an exhaust chimney 6 connected in series via flanged piping. The exhaust gas separator 3 has a drain port at its bottom and is connected to a waste liquid recovery tank 4 via piping. The exhaust gas collection device 1 is used for initial capture of exhaust gas emitted during the process. The centrifugal booster conveying device 2 is a centrifugal blower used to drive the exhaust gas flow. The exhaust gas separator 3 is the core separation unit of the system. The waste liquid recovery tank 4 is used to collect liquefied organic matter. The catalytic reaction device 5 is used to perform an oxidation / reduction catalytic reaction on the pretreated exhaust gas. The exhaust chimney 6 is used for high-altitude emission of the treated clean gas. Flanged piping refers to a system that connects pipes, fittings, or various devices through flange connections. Flange connections use bolts, nuts, and other fasteners to tightly connect two devices or components with flanges, thereby achieving fluid transport and control.

[0022] See also Figure 1The exhaust gas separator 3 is equipped with multiple baffle assemblies along the gas flow direction, and these baffle assemblies are electrically connected to the controller and the cooler, respectively. Each baffle assembly includes a baffle body 31, a rotating shaft 32, and an angle adjusting member 33. The rotating shaft 32 is placed inside the exhaust gas separator 3, passes through the top of the exhaust gas separator 3, and is connected to the output end of the angle adjusting member 33 located at the top of the exhaust gas separator 3. The baffle body 31 is located inside the exhaust gas separator 3 and fixed to the rotating shaft 32. The baffle body 31 can be made of any of the following materials: stainless steel, aluminum alloy, or titanium alloy. These materials are not only corrosion-resistant but also have high thermal conductivity. Of course, those skilled in the art can also use other corrosion-resistant and high thermal conductivity materials to make the baffle body 31, which will not be elaborated here. Baffle bodies 31 made of these materials should all be within the scope of protection of this application. The baffle body 31 is equipped with a temperature sensor, a humidity sensor, and a gas concentration sensor. The rotating shaft 32 is driven by the angle adjusting component 33 to rotate, which in turn drives the baffle body 31 to rotate, thereby changing the rotation angle of the baffle. The rotation angle of the baffle body 31 can be automatically adjusted according to changes in the exhaust gas flow and composition, optimizing gas-liquid contact efficiency and improving condensation recovery rate. To better control the rotation angle of the baffle body 31, the angle adjusting component 33 is selected from a stepper motor or a drive motor. In this case, one end of the rotating shaft 32 passes through the top of the exhaust gas separator 3 and is connected to the drive end of the stepper motor or drive motor located at the top of the exhaust gas separator 3. To prevent gas leakage, a sealing ring is added between the rotating shaft 32 and the exhaust gas separator 3.

[0023] See also Figure 1 In this application, the bottom height of multiple baffle bodies 31 is distributed in a progressively decreasing manner, thereby dividing the tail gas separator 3 into multiple condensation chambers with different temperature gradients. By utilizing the principle of segmented cooling to gradually reduce the temperature and humidity of the tail gas, selective recovery of components with different boiling points (such as phenol and acetone) is achieved, improving resource utilization. The thickness of the baffle body 31 is 1~10mm, and each baffle body 31 is provided with uniformly distributed micropores, preferably with a pore size of 200~500μm. During the condensation and separation process, the micropores not only act as physical barriers but also promote the formation of micro-turbulence in the gas and liquid phases near the micropores, enhancing heat and mass transfer and further improving separation efficiency. The micropores allow the gas phase medium to permeate and flow, while simultaneously promoting the collision, aggregation, and capture of droplets in the gas-liquid two-phase flow on the plate surface. The micropores need to be small enough to prevent large-scale short-circuiting of gas, but also large enough and reasonably distributed to ensure that the condensate flows smoothly and is not easily blocked by impurities. In order to effectively suppress the formation of liquid film in the micropores that hinders heat transfer, this application coats the surface of the micropores with a hydrophobic polytetrafluoroethylene coating.

[0024] See also Figure 1Along the gas flow direction, the height of the tops of multiple baffle bodies 31 is distributed in a progressively increasing manner. This design, with the tops of the baffle bodies 31 rising and the bottoms falling, not only improves the exhaust gas separation efficiency but also adapts to exhaust gas treatment under different operating conditions. Specifically, as the exhaust gas flows in the exhaust gas separator 3, its velocity gradually decreases. The progressively increasing height distribution of the baffle tops better adapts to changes in exhaust gas velocity. At the front end of the gas flow, the velocity is relatively high, and the lower baffle tops allow the exhaust gas to fully contact the baffles, initially separating larger droplets. As the gas continues to flow to the rear end, the velocity decreases, and the progressively increasing baffle tops provide a longer flow path and more sufficient separation time for the gas, which is beneficial for separating smaller droplets, thereby improving the overall separation efficiency. For exhaust gases containing droplets of different sizes and different compositions, the progressively rising baffles can better achieve staged separation. In the early stage of exhaust gas flow, large droplets can be separated, and in the later stage, small droplets can be separated by the progressively rising baffles. This can effectively handle more complex exhaust gas compositions and meet the exhaust gas treatment requirements under various operating conditions.

[0025] In other embodiments of this application, the tops of multiple baffle bodies 31 may also be set at the same horizontal height. With all baffle bodies 31 having flush tops, processing and installation are simpler and more direct. Furthermore, when the exhaust gas flows in the exhaust gas separator 3, if the tops of the baffle bodies 31 are at the same horizontal height, the velocity distribution of the exhaust gas passing through each baffle body 31 can be relatively uniform. This uniform velocity distribution ensures that droplets have similar collision and settling conditions at each baffle body 31, thereby improving separation efficiency.

[0026] This application, by precisely controlling the cooling capacity input of the exhaust gas separator 3, can establish and maintain a preset temperature gradient field in each condensing chamber connected in series along the airflow direction. Ideally, the temperature is set to be highest in the inlet-side chamber and gradually decreases to the lowest temperature in the outlet-side chamber. After the exhaust gas carrying condensable volatile organic compounds or moisture enters the exhaust gas separator 3, it flows sequentially through condensing chambers with different temperature gradients. During the gradual cooling process, components with different boiling points / dew points undergo phase change condensation on the surface of the baffle body 31 at the corresponding temperature. The condensate droplets flow downwards along the surface of the baffle body 31 under gravity and collect at the drain port, then are discharged into the waste liquid recovery tank 4.

[0027] In summary, this application provides a highly efficient and adaptable exhaust gas treatment system that can be directly installed on any tank that generates exhaust gas without major changes to the production line. This allows the exhaust gas treatment system to be quickly integrated into the existing production line, reducing the equipment modification time from two months to less than 72 hours. This significantly reduces time costs while improving the organic matter recovery rate, achieving a win-win situation for both economic and environmental benefits.

[0028] The above are merely embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. An off-gas treatment system, characterized by, The tail gas collecting device, the centrifugal booster conveying device, the tail gas separation tank, the catalytic reaction device and the exhaust chimney are connected in series by flange type pipelines, the tail gas separation tank is provided with a liquid discharge port at the bottom and is connected with a waste liquid recovery tank by a pipeline, a plurality of baffle assemblies are arranged in the tail gas separation tank along the gas flow direction, the baffle assemblies are electrically connected with a controller and a refrigerator respectively, each baffle assembly comprises a baffle body, the heights of the baffle bodies at the bottom are distributed in a step-down manner, so that the tail gas separation tank is divided into a plurality of condensation chambers with different temperature gradients, and a plurality of micropores are arranged on each baffle body.

2. The off-gas treatment system according to claim 1, characterized by, The thickness of the baffle body is 1-10 mm.

3. The off-gas treatment system of claim 1, wherein, The pore size of the micropore is 200-500 μm.

4. The off-gas treatment system of claim 1, wherein, The surface of the micropore channel is coated with a polytetrafluoroethylene hydrophobic coating.

5. The off-gas treatment system of claim 1, wherein, The heights of the top portions of the plurality of baffle bodies along the gas flow direction are distributed in a step-up manner.

6. The off-gas treatment system of claim 1, wherein, The top portions of the plurality of baffle bodies are arranged at the same horizontal height.

7. The off-gas treatment system of claim 1, wherein, The baffle assembly further comprises a rotating shaft and an angle adjusting member, the rotating shaft is arranged in the tail gas separation tank and penetrates through the top portion of the tail gas separation tank, is connected with the angle adjusting member arranged at the top portion of the tail gas separation tank, and the baffle body is arranged in the tail gas separation tank and is fixed on the rotating shaft.

8. The off-gas treatment system according to claim 7, characterized by The angle adjusting member is a stepping motor or a driving motor.

9. The off-gas treatment system of claim 7, wherein, A sealing ring is arranged between the rotating shaft and the tail gas separation tank.

10. The off-gas treatment system of claim 7, wherein, Temperature sensors, humidity sensors and gas concentration sensors are arranged on the baffle body.

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