VOCs waste gas treatment system

Abstract

The utility model discloses a VOCs waste gas treatment system which comprises a waste gas box, an adsorption box, a transfer box, a steam generator and a condensation assembly, the waste gas box is communicated with the adsorption box through a first conveying pipe; the adsorption box is communicated with the transfer box through a second conveying pipe, and the transfer box is communicated with the first conveying pipe through a return pipe; the steam generator is communicated with the adsorption box through a third conveying pipe; the condensation assembly is communicated with the adsorption box through a fourth conveying pipe; a plurality of adsorption plates are alternately arranged on the two opposite side walls of the adsorption box, and the adsorption plates are obliquely arranged downwards; according to the VOCs waste gas treatment system, VOCs in waste gas can be efficiently removed through a series of processes such as adsorption, desorption and circular treatment, and the emission concentration of the VOCs to the atmosphere is reduced; steam generated by the steam generator can be introduced into the adsorption box to perform desorption treatment on the VOCs adsorbed on the adsorption plate; the adsorption plate can be regenerated and reused in a mode of combining steam desorption and condensation recovery.

Description

Technical Field

[0001] This utility model belongs to the field of waste gas recovery and treatment technology, and specifically relates to a VOCs waste gas treatment system. Background Technology

[0002] VOCs are various organic compounds with boiling points ranging from 50°C to 260°C at room temperature. In my country, VOCs refer to organic compounds with a saturated vapor pressure greater than 70 Pa at room temperature and a boiling point below 260°C at normal pressure, or all organic compounds with a vapor pressure greater than or equal to 10 Pa at 20°C and exhibiting volatility. VOCs waste gas is mainly generated from waste gas emissions during the production processes of petroleum, chemical, and related industries, such as factory waste gas, light industrial waste gas, printing and dyeing waste gas, pharmaceutical waste gas, steel plant waste gas, machinery manufacturing waste gas, electronics plant waste gas, electroplating plant waste gas, and paint waste gas. They generally possess characteristics such as being flammable and explosive, toxic and harmful, and difficult to treat.

[0003] VOCs waste gas treatment technologies mainly include adsorption, absorption, catalytic combustion, and biological treatment. Commonly used adsorbents, such as activated carbon, have a large specific surface area and good adsorption performance, but their adsorption capacity is limited and they need to be replaced or regenerated regularly.

[0004] Therefore, this application provides a VOCs waste gas treatment system designed to facilitate the desorption of activated carbon and improve the VOCs waste gas treatment efficiency. Utility Model Content

[0005] This invention provides a VOCs waste gas treatment system, which aims to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A VOCs waste gas treatment system includes: a waste gas box, an adsorption box, a transfer box, a steam generator, and a condensation assembly;

[0008] The side wall of the waste gas box is provided with several first air inlets, and the waste gas box is connected to the adsorption box through a first conveying pipe;

[0009] The adsorption box is connected to the transfer box via a second conveying pipe, and the transfer box is connected to the first conveying pipe via a return pipe;

[0010] The steam generator is connected to the adsorption box via a third delivery pipe;

[0011] The condensation assembly is connected to the adsorption box via a fourth delivery pipe;

[0012] Control valves are provided at both ends of the first, second, third, and fourth conveying pipes, as well as at the end of the return pipe that mates with the transfer box.

[0013] Several adsorption plates are alternately arranged on the two opposite side walls of the adsorption box, and the adsorption plates are inclined downwards.

[0014] Furthermore, the adsorption plate includes an activated carbon plate and a heating plate, wherein the activated carbon plates are spaced apart above the heating plate, and the heating plate is corrugated and has several through holes.

[0015] Furthermore, an air pump is installed on the first delivery pipe, and a balancing valve is installed at the bottom of the waste gas box. The balancing valve is used to adjust the air pressure inside the waste gas box.

[0016] Furthermore, the balancing valve includes: a valve body fixedly connected to the exhaust gas box; a second air inlet is provided on the side of the valve body away from the exhaust gas box; a sealing ball for closing the second air inlet is provided in the inner cavity of the valve body; a guide rod is provided on the side of the sealing ball away from the second air inlet; the guide rod is slidably connected to the side wall of the valve body adjacent to the exhaust gas box; a return spring is sleeved on the guide rod; the two ends of the return spring respectively cooperate with the sealing ball and the side wall of the valve body; a plurality of air holes are opened on the side wall; the air holes communicate with the inner cavity of the exhaust gas box; and a clearance hole is provided on the exhaust gas box for avoiding the guide rod.

[0017] Furthermore, a dust filter box is provided at the second air inlet of the balance valve.

[0018] Furthermore, the transfer box is equipped with a VOCs concentration detection sensor inside, and an exhaust pipe is installed on one side of the transfer box, with a control valve installed on the exhaust pipe.

[0019] Furthermore, the condensation assembly includes: a low-temperature chamber, a collection chamber, and a condenser tube. The low-temperature chamber is located at the top of the collection chamber, and the condenser tube is located inside the collection chamber and extends to the outside of the collection chamber to cooperate with the low-temperature chamber. A drain port is provided at the bottom of the collection chamber, and a control valve is provided at the drain port.

[0020] Furthermore, a fifth delivery pipe is provided on one side of the collection box, a control valve is provided on the fifth delivery pipe, and a VOCs concentration detection sensor is provided inside the collection box, with the VOCs concentration detection sensor adjacent to the air inlet of the fifth delivery pipe.

[0021] Compared with the prior art, the present invention has the following technical effects:

[0022] 1. The VOCs waste gas treatment system described in this utility model can efficiently remove VOCs from waste gas and reduce their emission concentration into the atmosphere through a series of processes including adsorption, desorption, and recycling. This helps reduce the generation of air pollution problems such as photochemical smog and haze, improve air quality, and protect the ecological environment. Simultaneously, the condensation component recovers the desorbed VOCs, avoiding direct emission of VOCs and pollution of soil, water bodies, and other environmental elements.

[0023] 2. The VOCs waste gas treatment system of this utility model utilizes alternating, downward-sloping adsorption plates within the adsorption chamber to ensure a relatively stable flow of waste gas within the chamber. The uniform and tortuous airflow path avoids localized excessively fast or slow airflow, guaranteeing that the waste gas can uniformly contact each adsorption plate, thus making the adsorption process more stable. This helps maintain consistent adsorption efficiency and reduces fluctuations in adsorption effect caused by uneven airflow distribution.

[0024] 3. In the VOCs waste gas treatment system of this utility model, the steam generator is connected to the adsorption box via a third conveying pipe, and the condensation assembly is connected to the adsorption box via a fourth conveying pipe. The steam generated by the steam generator can be introduced into the adsorption box to desorb the VOCs adsorbed on the adsorption plates. The desorbed VOCs steam enters the condensation assembly through the fourth conveying pipe, where it is cooled and condensed into a liquid state, thus achieving VOCs recovery and separation. This method, combining steam desorption and condensation recovery, not only allows the adsorption plates to be regenerated and reused, reducing operating costs, but also effectively recovers and utilizes VOCs, reducing resource waste and environmental pollution. Attached Figure Description

[0025] Figure 1 This is an overall schematic diagram of a VOCs waste gas treatment system according to the present invention;

[0026] Figure 2 This is a schematic diagram of the adsorption plate structure of a VOCs waste gas treatment system according to this utility model;

[0027] Figure 3 This is a schematic diagram of the condensation component of a VOCs waste gas treatment system according to this utility model;

[0028] Figure 4 This is a schematic diagram of the balance valve of a VOCs waste gas treatment system according to this utility model.

[0029] In the picture:

[0030] 1. Exhaust gas box; 101. First air inlet;

[0031] 2. Adsorption box; 201. Adsorption plate; 2011. Activated carbon plate; 2012. Heating plate;

[0032] 3. Transfer box; 4. First conveying pipe; 5. Air pump; 6. Second conveying pipe; 7. Steam generator; 8. Third conveying pipe; 9. Fourth conveying pipe;

[0033] 10. Condensation assembly; 1001. Low temperature chamber; 1002. Collection box; 1003. Condensation tube; 1004. Fifth delivery pipe; 1005. Drain port;

[0034] 11. VOCs concentration detection sensor;

[0035] 12. Balance valve; 1201. Valve body; 1202. Second air inlet; 1203. Sealing ball; 1204. Guide rod; 1205. Return spring; 1206. Air hole; 1207. Dust filter box;

[0036] 13. Return pipe. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to specific embodiments of this application and the accompanying drawings.

[0038] like Figure 1 As shown, a VOCs waste gas treatment system includes: a waste gas box 1, an adsorption box 2, a transfer box 3, a steam generator 7, and a condensation assembly 10.

[0039] The side wall of the exhaust gas box 1 is provided with a plurality of first air inlets 101, and the exhaust gas box 1 is connected to the adsorption box 2 through the first conveying pipe 4.

[0040] The adsorption box 2 is connected to the transfer box 3 through the second conveying pipe 6, and the transfer box 3 is connected to the first conveying pipe 4 through the return pipe 13;

[0041] The steam generator 7 is connected to the adsorption box 2 via the third delivery pipe 8;

[0042] The condensation assembly 10 is connected to the adsorption box 2 via the fourth delivery pipe 9;

[0043] Control valves are provided at both ends of the first conveying pipe 4, the second conveying pipe 6, the third conveying pipe 8, and the fourth conveying pipe 9, as well as at the end of the return pipe 13 that mates with the transfer box 3;

[0044] Several adsorption plates 201 are alternately arranged on the two opposite side walls of the adsorption box 2, and the adsorption plates 201 are inclined downward.

[0045] The aforementioned VOCs waste gas treatment system, through the coordinated operation of its components, achieves a series of processes including VOCs adsorption, desorption, and recycling, efficiently removing VOCs from waste gas and reducing their emission concentration into the atmosphere. The alternating, downward-sloping adsorption plates 201 within the adsorption chamber 2 ensure a relatively stable flow of waste gas within the chamber. The uniform and tortuous airflow path avoids localized excessively fast or slow airflow, guaranteeing uniform contact between the waste gas and each adsorption plate 201, making the adsorption process more stable. This helps maintain consistent adsorption efficiency and reduces fluctuations in adsorption effect caused by uneven airflow distribution.

[0046] Steam generator 7 is connected to adsorption tank 2 via third conveying pipe 8, and condensation assembly 10 is connected to adsorption tank 2 via fourth conveying pipe 9. Steam generated by steam generator 7 can be introduced into adsorption tank 2 to desorb VOCs adsorbed on adsorption plate 201. The desorbed VOCs vapor enters condensation assembly 10 via fourth conveying pipe 9, where it is cooled and condensed into a liquid state, thus achieving VOCs recovery and separation. This method, combining steam desorption and condensation recovery, not only allows adsorption plate 201 to be regenerated and reused, reducing operating costs, but also effectively recovers and utilizes VOCs, reducing resource waste and environmental pollution.

[0047] like Figure 2 As shown, the adsorption plate 201 includes an activated carbon plate 2011 and a heating plate 2012. The activated carbon plate 2011 is spaced above the heating plate 2012. The heating plate 2012 is corrugated and has several through holes.

[0048] The heating plate 2012 and activated carbon plate 2011 are set separately, avoiding direct damage to the activated carbon plate 2011 from high temperatures during heating. The layered structure of this system allows the activated carbon plate 2011 to desorb at a relatively mild temperature, reducing structural damage caused by high temperatures, thus extending the service life of the activated carbon plate and lowering replacement costs. Compared to a flat heating plate, the corrugated heating plate 2012 has a significantly increased surface area, thereby transferring heat to the activated carbon plate 2011 more efficiently.

[0049] The presence of through holes allows the exhaust gas to flow more smoothly within the adsorption box. During the adsorption process, the exhaust gas can pass through the heating plate 2012 through the through holes and fully contact the activated carbon plate 2011, increasing the contact opportunities between the exhaust gas and the activated carbon plate 2011 and improving the adsorption effect.

[0050] like Figure 1As shown, an air pump 5 is installed on the first conveying pipe 4, and a balance valve 12 is installed at the lower part of the exhaust gas box 1. The balance valve 12 is used to adjust the air pressure inside the exhaust gas box 1. The installation of the air pump 5 can effectively enhance the conveying power of the exhaust gas, and the installation of the balance valve 12 can prevent the exhaust gas box 1 from collapsing and being damaged due to excessively low air pressure inside the exhaust gas box 1 when the air pump 5 is working.

[0051] like Figure 4 As shown, the balance valve 12 includes: a valve body 1201 fixedly connected to the exhaust gas box 1; a second air inlet 1202 is provided on the side of the valve body 1201 away from the exhaust gas box 1; a sealing ball 1203 for closing the second air inlet 1202 is provided in the inner cavity of the valve body 1201; a guide rod 1204 is provided on the side of the sealing ball 1203 away from the second air inlet 1202; the guide rod 1204 is slidably connected to the side wall of the valve body 1201 adjacent to the exhaust gas box 1; a return spring 1205 is sleeved on the guide rod 1204; the two ends of the return spring 1205 respectively cooperate with the sealing ball 1203 and the side wall of the valve body 1201; a plurality of air holes 1206 are opened on the side wall; the air holes 1206 communicate with the inner cavity of the exhaust gas box 1; and the exhaust gas box 1 is provided with a clearance hole for avoiding the guide rod 1204.

[0052] The working principle is based on the change in air pressure inside the exhaust gas chamber 1 to control the position of the sealing ball 1203, thereby opening and closing the second air inlet 1202 to balance the air pressure inside and outside the exhaust gas chamber. When the air pressure inside the exhaust gas chamber 1 is lower than the outside air pressure by a certain amount, the outside air pressure pushes the sealing ball 1203 to move and open the second air inlet 1202, allowing outside air to enter; when the air pressure returns to balance, the return spring 1205 causes the sealing ball 1203 to return to its original position and close the second air inlet 1202.

[0053] like Figure 4 As shown, a dust filter box 1207 is provided at the second air inlet 1202 of the balance valve 12. The dust filter box 1207 can prevent external impurities from entering the exhaust gas box 1.

[0054] In one specific embodiment, a VOCs concentration detection sensor is installed inside the transfer box 3, and an exhaust pipe with a control valve is installed on one side of the transfer box 3. Through the VOCs concentration detection sensor inside the transfer box 3, the entire system can dynamically monitor the VOCs concentration of the treated waste gas, thereby determining the adsorption efficiency of the adsorption box 2. Based on the adsorption efficiency of the adsorption box 2, the system decides whether to perform desorption treatment on the adsorption box 2, and can also reflux gases with high VOCs concentrations for secondary adsorption treatment.

[0055] like Figure 3As shown, the condensation assembly 10 includes: a low-temperature chamber 1001, a collection chamber 1002, and a condenser tube 1003. The low-temperature chamber 1001 is disposed on the upper part of the collection chamber 1002. The condenser tube 1003 is disposed in the inner cavity of the collection chamber 1002 and extends to the outside of the collection chamber 1002 to cooperate with the low-temperature chamber 1001. A drain port 1005 is provided at the lower part of the collection chamber 1002, and a control valve is provided at the drain port 1005.

[0056] like Figure 3 As shown, a fifth delivery pipe 1004 is provided on one side of the collection box 1002, and a control valve is provided on the fifth delivery pipe 1004. A VOCs concentration detection sensor 11 is provided in the inner cavity of the collection box 1002, and the VOCs concentration detection sensor 11 is adjacent to the air inlet of the fifth delivery pipe 1004.

[0057] By setting up the condensation component 10, the desorbed VOCs vapor can be easily condensed, thereby realizing the recovery and separation of VOCs.

[0058] In one specific embodiment, after the steam generator 7 first introduces high-temperature steam into the adsorption box 2, the humidity of the activated carbon plate 2011 will increase. Therefore, the steam generator 7 subsequently provides dry gas into the adsorption box 2, and the heating plate 2012 starts to work to dry the activated carbon plate 2011, so as to avoid the excessive humidity of the activated carbon plate 2011 from affecting its subsequent adsorption efficiency.

[0059] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present utility model, and these all fall within the protection scope of the present utility model.

Claims

1. A VOCs waste gas treatment system, characterized in that, include: The exhaust gas box (1), adsorption box (2), transfer box (3), steam generator (7) and condensation assembly (10); The side wall of the exhaust gas box (1) is provided with a plurality of first air inlets (101), and the exhaust gas box (1) is connected to the adsorption box (2) through a first conveying pipe (4); The adsorption box (2) is connected to the transfer box (3) through the second conveying pipe (6), and the transfer box (3) is connected to the first conveying pipe (4) through the return pipe (13); The steam generator (7) is connected to the adsorption box (2) through the third delivery pipe (8); The condensation assembly (10) is connected to the adsorption box (2) through the fourth delivery pipe (9); Control valves are provided at both ends of the first conveying pipe (4), the second conveying pipe (6), the third conveying pipe (8), the fourth conveying pipe (9), and at the end of the return pipe (13) that is connected to the transfer box (3); Several adsorption plates (201) are alternately arranged on the two opposite side walls of the adsorption box (2), and the adsorption plates (201) are arranged at an angle downwards.

2. The VOCs waste gas treatment system according to claim 1, characterized in that, The adsorption plate (201) includes an activated carbon plate (2011) and a heating plate (2012). The activated carbon plate (2011) is spaced above the heating plate (2012). The heating plate (2012) is corrugated and has several through holes.

3. The VOCs waste gas treatment system according to claim 1, characterized in that, An air pump (5) is installed on the first delivery pipe (4), and a balance valve (12) is installed at the lower part of the waste gas box (1). The balance valve (12) is used to adjust the air pressure inside the waste gas box (1).

4. The VOCs waste gas treatment system according to claim 3, characterized in that, The balancing valve (12) includes: a valve body (1201) fixedly connected to the waste gas box (1), a second air inlet (1202) provided on the side of the valve body (1201) away from the waste gas box (1), a sealing ball (1203) for closing the second air inlet (1202) provided in the inner cavity of the valve body (1201), and a guide rod (1204) provided on the side of the sealing ball (1203) away from the second air inlet (1202). The guide rod (1204) is slidably connected to the side wall adjacent to the valve body (1201) and the exhaust gas box (1). A return spring (1205) is sleeved on the guide rod (1204). The two ends of the return spring (1205) are respectively engaged with the sealing ball (1203) and the side wall of the valve body (1201). A plurality of air holes (1206) are opened on the side wall. The air holes (1206) are connected to the inner cavity of the exhaust gas box (1). The exhaust gas box (1) is provided with a clearance hole for avoiding the guide rod (1204).

5. A VOCs waste gas treatment system according to claim 4, characterized in that, A dust filter box (1207) is provided at the second air inlet (1202) of the balance valve (12).

6. A VOCs waste gas treatment system according to claim 1, characterized in that, The transfer box (3) is equipped with a VOCs concentration detection sensor inside, and an exhaust pipe is provided on one side of the transfer box (3), with a control valve installed on the exhaust pipe.

7. A VOCs waste gas treatment system according to claim 1, characterized in that, The condensation assembly (10) includes: a low-temperature chamber (1001), a collection chamber (1002), and a condenser tube (1003). The low-temperature chamber (1001) is located at the upper part of the collection chamber (1002). The condenser tube (1003) is located in the inner cavity of the collection chamber (1002) and extends to the outside of the collection chamber (1002) to cooperate with the low-temperature chamber (1001). A drain port (1005) is provided at the lower part of the collection chamber (1002), and a control valve is provided at the drain port (1005).

8. A VOCs waste gas treatment system according to claim 7, characterized in that, A fifth delivery pipe (1004) is provided on one side of the collection box (1002), and a control valve is provided on the fifth delivery pipe (1004). A VOCs concentration detection sensor (11) is provided in the inner cavity of the collection box (1002), and the VOCs concentration detection sensor (11) is adjacent to the air inlet of the fifth delivery pipe (1004).

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