Volatile organic compound treatment device

Abstract

The utility model provides a volatile organic compound treatment device and belongs to the field of waste gas treatment.The volatile organic compound treatment device comprises a preheating device, a catalytic combustion device and a heat recovery device.A gas inlet and a gas outlet are formed in the two ends of the preheating device respectively, a preheating pipeline is arranged in the preheating device, and the gas outlet is communicated with the catalytic combustion device; a heating plate and a catalysis plate are arranged in the catalytic combustion device, the catalytic combustion device is fixedly connected with a conveying pipeline, the end, away from the catalytic combustion device, of the conveying pipeline is fixedly connected with a heat recovery device, the heat recovery device comprises a heat exchange tank and a heating tank, and the heat exchange tank is connected with a preheating pipeline through a gas guide pipeline. The device has the beneficial effects that the heat utilization rate is high, and the heating efficiency can be improved.

Description

Technical Field

[0001] The invention belongs to the field of waste gas treatment, and in particular relates to a volatile organic compound treatment device. Background Art

[0002] The current production and processing of asphalt and ethylene tar will produce a large amount of gaseous volatile organic compounds. These volatile organic compounds will cause serious environmental pollution if directly discharged into the air, and will also cause harm to the surrounding ecology and people. Therefore, the volatile organic compounds in the production of asphalt and ethylene tar need to be harmlessly treated before being discharged. Now one of the treatment methods for volatile organic compounds generated in the production process is combustion treatment. The combustion treatment method is more efficient and has better treatment quality than other methods. However, the current combustion treatment is divided into three steps. These three steps result in serious heat waste, resulting in low energy utilization and serious energy waste. Under normal operation, the heat generated by combustion is wasted.

[0003] For example, patent CN201922188681.X adopts a three-step catalytic combustion technology, namely a flame arrester, a catalytic combustion bed and a purification box. This traditional three-step method for catalytic combustion makes it impossible to heat the volatile organic compounds in the flame arrester to a sufficient temperature, so additional heating is required for catalytic combustion, which not only consumes additional energy, but also causes the temperature to rise slowly, which cannot meet the conditions for exhaust gas cleaning and combustion catalysis, resulting in very low efficiency of catalytic combustion; the catalytic combustion bed and the purification box cannot recover the heat generated by the catalytic combustion, resulting in the heat of combustion being wasted.

[0004] Therefore, a volatile organic compound treatment device that can overcome the above problems is needed. Summary of the Invention

[0005] The present invention provides a volatile organic compound (VOC) treatment device with high heat utilization and increased heating efficiency, particularly suitable for VOC treatment in chemical production processes. The technical problems to be solved are: the current multi-step VOC cleaning process results in low cleaning efficiency and the inability to recycle the heat generated by catalytic combustion during VOC treatment.

[0006] The technical solution adopted by the present invention is:

[0007] A volatile organic compound treatment device includes a preheating device, a catalytic combustion device and a heat recovery device, wherein an air inlet and an exhaust port are respectively provided at both ends of the preheating device, a preheating pipe is provided inside the preheating device, and the exhaust port is connected to the catalytic combustion device. A heating plate and a catalytic plate are provided inside the catalytic combustion device, the catalytic combustion device is fixedly connected to a delivery pipe, and the delivery pipe is fixedly connected to a heat recovery device at one end away from the catalytic combustion device. The heat recovery device includes a heat exchange tank and a heating tank, and the heat exchange tank is connected to the preheating pipe through an air guide pipe.

[0008] Furthermore, the preheating pipe inside the preheating device is arranged in a spiral shape.

[0009] Furthermore, one end of the preheating pipe is a conical spiral structure, and the pitch of the conical spiral at one end of the preheating pipe is smaller than that at the other end.

[0010] Furthermore, the exhaust port and the air inlet are both conical, and the conical spiral of the preheating pipe matches the conical interface of the exhaust port.

[0011] Furthermore, a plurality of heating plates and catalytic plates are alternately arranged inside the catalytic combustion device, the heating plates adopt a grid structure, and a catalyst for catalytic combustion is arranged inside the catalytic plates.

[0012] Furthermore, thermal insulation material is provided on the outside of the delivery pipeline.

[0013] Furthermore, the heating tank of the heat recovery device is covered on the outside of the heat exchange tank, an insulation layer is provided on the outside of the heating tank, a cavity is provided between the heating tank and the heat exchange tank, the cavity between the heating tank and the heat exchange tank is connected to the air duct, and the air duct is fixedly connected to the air inlet end of the preheating pipe.

[0014] Furthermore, a pressurized fan is provided at the air inlet end of the preheating pipe.

[0015] Furthermore, a heat recovery pipe is sheathed outside the delivery pipe, and a heat exchange gap is provided between the heat recovery pipe and the delivery pipe.

[0016] Furthermore, the heat recovery device is located directly above or directly below the preheating device.

[0017] The above structure has the following beneficial effects:

[0018] 1. The use of a preheating device for preheating and the use of spiral and conical spiral preheating pipes overcomes the problems of slow preheating speed and poor preheating effect of the current preheating method, thereby greatly accelerating the preheating speed of the gas and improving the preheating efficiency.

[0019] 2. Since the catalytic combustion device adopts multiple layers of alternating heating plates and catalytic plates, catalytic combustion and supplementary heating are carried out layer by layer, which overcomes the current problems of long catalytic combustion time and low catalytic combustion efficiency, thereby greatly improving the combustion efficiency. At the same time, multi-layer combustion can also make the combustion more thorough and greatly reduce the time required for combustion.

[0020] 3. Since a heat recovery device is used to recycle heat for secondary use, the heat recovery device can be used for heating, steam production, equipment insulation, etc., overcoming the problem of large amounts of heat waste caused by existing equipment simply using waste heat for preheating, thereby improving heat utilization and reducing energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front view of the present invention;

[0022] Figure 2 is a top view of the present invention;

[0023] Figure 3 The present invention Figure 2 Cross-sectional view at AA in the middle;

[0024] Figure 4 The present invention Figure 2 Cross-sectional view at the middle BB;

[0025] Figure 5 The present invention Figure 4 Enlarged view of point C in the middle;

[0026] Figure 6 It is a schematic diagram of the optimized structure of the present invention.

[0027] In the picture:

[0028] 1. Preheating device; 2. Catalytic combustion device; 3. Conveying pipeline; 4. Heat recovery device; 5. Preheating pipeline; 6. Exhaust port; 7. Air inlet; 8. Heating plate; 9. Catalytic plate; 10. Insulation layer; 11. Heat exchange tank; 12. Heating tank; 13. Pressurized fan; 14. Heat recovery pipeline. DETAILED DESCRIPTION

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1-6 As shown:

[0031] A volatile organic compound treatment device includes a preheating device 1, a catalytic combustion device 2, and a heat recovery device 4. The preheating device 1 is provided with an air inlet 7 and an exhaust port 6 at either end. Both the exhaust port 6 and the air inlet 7 are tapered, with the tapered spiral of the preheating pipe 5 matching the tapered interface of the exhaust port 6. The tapered exhaust port 6 and air inlet 7 utilize the Bernoulli principle to rapidly reduce the airflow velocity during intake and rapidly increase the airflow velocity during exhaust, thereby improving both heating efficiency and catalytic combustion efficiency while eliminating the need for additional air pressure.

[0032] Preheating device 1 includes a preheating conduit 5, which is spirally configured. One end of the conical spiral has a smaller pitch than the other. The spiral shape effectively increases the contact area between the airflow and the conical conduit 5, significantly improving the heating efficiency of the airflow. The conical spiral structure ensures full contact between the airflow and the conical conduit 5, resulting in more uniform heating and a better preheating effect, facilitating the subsequent catalytic combustion process.

[0033] The exhaust port 6 is connected to the catalytic combustion device 2. A heating plate 8 and a catalytic plate 9 are provided inside the catalytic combustion device 2. The heating plate 8 provides heat for the preheated gas to reach the catalytic combustion temperature. The catalytic plate 9 can catalytically burn the exhaust gas formed by the combustion of volatile organic compounds. The catalytic combustion device 2 is connected to the delivery pipe 3 via a flange. The delivery pipe 3 is connected to the heat recovery device 4 via a flange at the end away from the catalytic combustion device 2. The heat recovery device 4 includes a heat exchange tank 11 and a heating tank 12. The heat exchange tank 11 is connected to the preheating pipe 5 via an air guide pipe. Catalytic combustion releases a large amount of heat. The catalytic combustion gas carrying a large amount of heat passes through the heat recovery device 4 and the preheating pipe 5 for secondary utilization, thereby effectively improving the utilization rate of heat and avoiding heat waste. At the same time, the heat generated by catalytic combustion is much greater than the heat required for catalytic combustion. Therefore, after one heating, it can be circulated with the help of the preheating device, and subsequent heating is no longer required, which can effectively save heating energy consumption.

[0034] The catalytic combustion device 2 includes a plurality of alternating heating plates 8 and catalytic plates 9. The heating plates 8 have a grid structure, and the catalytic combustion catalyst is disposed within the catalytic plates 9. The alternating arrangement of the plurality of heating plates 8 and catalytic plates 9 can avoid problems such as insufficient catalytic combustion and incomplete catalytic combustion caused by excessive heat in winter.

[0035] Heat-insulating material is arranged outside the delivery pipe 3. In order to avoid the waste of heat, the delivery pipe 3 is fully insulated.

[0036] Heat recovery device 4's heating tank 12 is wrapped around heat exchange tank 11. An insulation layer 10 is placed around the exterior of heating tank 12. A cavity is defined between heating tank 12 and heat exchange tank 11. This cavity connects to an air duct, which is fixedly connected to the air inlet of preheating pipe 5. Because air flows through heat exchange tank 11 before passing through preheating pipe 5, insulation layer 10 is required to effectively insulate heat exchange tank 11 and prevent excessive heat loss.

[0037] In order to avoid excessive heat loss that causes the preheating pipe 5 to be unable to reach the catalytic combustion temperature, the preheating pipe 5 can be directly connected to the delivery pipe 3, or a pressurizing fan 13 can be set at the air inlet end of the preheating pipe 5 to accelerate the flow of high-temperature gas through the pressurizing fan 13, thereby avoiding the problem that the heat cannot reach the catalytic combustion temperature. The heat exchange tank 11 is provided with a pressure relief port, and when the air pressure in the heat exchange tank 11 is too high, the excess pressure can be released in time through the pressure relief port. In order to avoid the temperature after heat exchange being insufficient to reach the catalytic combustion temperature, the working order of the heat recovery device 4 and the preheating pipe 5 can be changed, which will not affect the working effect, but will ensure the efficiency and quality of heat recovery.

[0038] A heat recovery pipe 14 is sheathed around the delivery pipe 3, with a heat exchange gap provided between the heat recovery pipe 14 and the delivery pipe 3. Liquid to be heated, or heating liquid, is heated in the heat exchange gap between the heat recovery pipe 14 and the delivery pipe 3 and then used for heating or domestic hot water, increasing heat utilization and reducing heat waste in the pipes.

[0039] The heat recovery device 4 is located just above or just below the preheating device 1. This can save a lot of space, reduce the length of the delivery pipeline 3, and avoid excessive waste of heat.

[0040] How this example works:

[0041] When the volatile organic compound waste gas is processed, the volatile organic compound waste gas is sent to the preheating device 1 through the air inlet 7. The conical structure of the air inlet 7 can reduce the flow velocity of the airflow, so that the airflow stays in the preheating device 1 for a longer time, providing a better preheating effect. The spiral preheating pipe 5 in the preheating device 1 effectively increases the contact area and improves the preheating effect. The conical spiral preheating pipe 5 is used to increase the contact area and time of the waste gas, effectively improving the heating efficiency and quality. The exhaust port 6 increases the flow velocity of the heated gas through the conical structure, thereby increasing the catalytic combustion device 2. The residence time is shorter. With the help of the multi-layer catalytic plates 9 and heating plates 8, the catalytic combustion work can be completed quickly in a short time, greatly improving work efficiency and work quality. The clean gas after catalytic combustion enters the heat exchange tank 11 for heat exchange, providing steam for production work, heating domestic water, heating for life and other secondary utilization methods, thereby greatly improving the utilization rate of heat and avoiding heat waste. At the same time, the heat released by catalytic combustion is much greater than the temperature required for catalytic combustion. Therefore, the heat released by catalytic combustion is used to preheat the exhaust gas, so that the catalytic combustion work does not require additional heating, saving energy consumption. In this way, the cyclic operation of catalytic combustion is realized, energy consumption is saved, and the excess heat is reused to avoid heat waste.

[0042] The directional terms mentioned in the present invention, such as "up", "down", "left", "right", etc., are only for better and clearer explanation and understanding of the present invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0043] The above description is based on the preferred embodiments of the present invention, but it should not be understood as limiting the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to be varied. All variations made within the scope of protection of the independent claims of the present invention are within the scope of protection of the present invention.

Claims

1. A volatile organic compound treatment device, comprising a preheating device (1), a catalytic combustion device (2) and a heat recovery device (4), characterized in that: An air inlet (7) and an air outlet (6) are respectively provided at both ends of the preheating device (1); a preheating pipe (5) is provided inside the preheating device (1); the air outlet (6) is connected to the catalytic combustion device (2); a heating plate (8) and a catalytic plate (9) are provided inside the catalytic combustion device (2); the catalytic combustion device (2) is fixedly connected to a delivery pipe (3); an end of the delivery pipe (3) away from the catalytic combustion device (2) is fixedly connected to a heat recovery device (4); the heat recovery device (4) comprises a heat exchange tank (11) and a heating tank (12); the heat exchange tank (11) is connected to the preheating pipe (5) via an air guide pipe.

2. The volatile organic compound treatment device according to claim 1, characterized in that: The preheating pipe (5) inside the preheating device (1) is configured in a spiral shape.

3. The volatile organic compound treatment device according to claim 2, characterized in that: One end of the preheating pipe (5) is a conical spiral structure, and the pitch of the conical spiral at one end of the preheating pipe (5) is smaller than that at the other end.

4. The volatile organic compound treatment device according to claim 3, characterized in that: The exhaust port (6) and the air inlet (7) are both conical, and the conical spiral of the preheating pipe (5) matches the conical interface of the exhaust port (6).

5. The volatile organic compound treatment device according to claim 1, characterized in that: A plurality of heating plates (8) and catalytic plates (9) are alternately arranged inside the catalytic combustion device (2); the heating plates (8) adopt a grid structure; and a catalyst for catalytic combustion is arranged inside the catalytic plates (9).

6. The volatile organic compound treatment device according to claim 1, characterized in that: A heat-insulating material is provided outside the delivery pipe (3).

7. The volatile organic compound treatment device according to claim 1, characterized in that: The heating tank (12) of the heat recovery device (4) is coated on the outside of the heat exchange tank (11), a heat insulation layer (10) is provided on the outside of the heating tank (12), a cavity is provided between the heating tank (12) and the heat exchange tank (11), the cavity between the heating tank (12) and the heat exchange tank (11) is connected to an air guide pipe, and the air guide pipe is fixedly connected to the air inlet end of the preheating pipe (5).

8. The volatile organic compound treatment device according to claim 7, characterized in that: A pressurizing fan (13) is provided at the air inlet end of the preheating pipe (5).

9. The volatile organic compound treatment device according to claim 1, characterized in that: A heat recovery pipe (14) is sheathed outside the delivery pipe (3), and a heat exchange gap is provided between the heat recovery pipe (14) and the delivery pipe (3).

10. The volatile organic compound treatment device according to claim 1, characterized in that: The heat recovery device (4) is located directly above or directly below the preheating device (1).

Images