A VOCs waste gas treatment equipment

Abstract

The utility model relates to a VOCs waste gas treatment equipment, include: be equipped with total inlet pipe, total outlet pipe, waste gas treater and reflux pipe's adsorption assembly, reflux pipe connects between total inlet pipe and total outlet pipe, total inlet pipe, first inlet pipe, waste gas import, waste gas export, first outlet pipe, total outlet pipe connect gradually and form adsorption loop, hot -blast channel, second inlet pipe, hot -blast import, hot -blast export, second outlet pipe, desorption combustion channel, between incinerator connect gradually and form desorption loop, concentration sensor of setting in first outlet pipe, respectively set in first inlet pipe, second inlet pipe, reflux pipe and total outlet pipe export place's electric valve, the electric valve on first inlet pipe and the electric valve on second inlet pipe do not open simultaneously, the electric valve on reflux pipe and the electric valve at total outlet pipe export place do not open simultaneously. The utility model discloses the VOCs waste gas treatment equipment has the advantages that the treatment effect is good, and the environment will not be polluted.

Description

Technical Field

[0001] This utility model relates to the field of waste gas treatment technology, and in particular to a VOCs waste gas treatment device. Background Technology

[0002] In modern industrial production, heating raw materials generates VOCs (volatile organic compounds). If these VOCs are directly released into the atmosphere with industrial exhaust, they cause serious environmental pollution, necessitating the use of waste gas treatment equipment. Combustion is one such treatment method. However, the concentration of VOCs mixed in industrial exhaust is often too low for direct combustion. Currently, most factories employ an "adsorption concentration + catalytic combustion" process to treat VOCs. Specifically, industrial exhaust containing VOCs is passed into an adsorption unit, separating the VOCs from the industrial exhaust and discharging industrial exhaust that meets standards. The VOCs accumulate in the adsorption unit to a high concentration suitable for direct combustion. Hot air is then introduced into the adsorption unit for desorption, separating the high-concentration VOCs from the adsorption unit and allowing them to be burned in a combustion furnace to produce carbon dioxide and water, achieving harmless treatment.

[0003] However, it has been found that using existing VOCs waste gas treatment equipment still causes environmental pollution. Utility Model Content

[0004] Therefore, the purpose of this utility model is to provide a VOCs exhaust gas processor.

[0005] A VOCs exhaust gas processor includes an adsorption assembly comprising a main inlet pipe, a main outlet pipe, an exhaust gas processor, and a return pipe; the return pipe connects the main inlet pipe and the main outlet pipe; the exhaust gas processor has an exhaust gas inlet, an exhaust gas outlet, a first inlet pipe, a first outlet pipe, a hot air inlet, a hot air outlet, a second inlet pipe, and a second outlet pipe; the exhaust gas inlet is connected to the main inlet pipe via the first inlet pipe, and the exhaust gas outlet is connected to the main outlet pipe via the first outlet pipe; a desorption combustion assembly includes an incinerator, a hot air passage, and a desorption combustion passage; the outlet of the incinerator is connected to the outside, the inlet of the incinerator is connected to one end of the desorption combustion passage, and the other end of the desorption combustion passage is connected to the second outlet pipe. The air duct is connected to the hot air outlet; one end of the hot air channel is connected to an external fan, and the other end is connected to the hot air inlet through the second air inlet pipe; the control assembly includes a concentration sensor, an electric valve, and a controller; the concentration sensor is installed on the first air outlet pipe, and the electric valves are respectively installed on the first air inlet pipe, the second air inlet pipe, the return pipe, and near the outlet of the main air outlet pipe; the controller is electrically connected to the concentration sensor and the electric valves, receives the measurement information from the concentration sensor, and controls the opening and closing of the electric valves, wherein the electric valves on the first air inlet pipe and the second air inlet pipe do not open simultaneously, and the electric valves on the return pipe and the electric valves near the outlet of the main air outlet pipe do not open simultaneously.

[0006] The VOCs exhaust gas processor of this utility model is equipped with a concentration detector on the first exhaust pipe to detect the concentration of VOCs exhaust gas in the industrial exhaust gas after treatment by the exhaust gas processor. When the concentration of VOCs exhaust gas exceeds the standard, the main exhaust pipe can be closed and the return pipe can be opened to allow the exhaust gas to flow back, so as to avoid the VOCs exhaust gas with excessive concentration being directly discharged into the outside environment and polluting the environment.

[0007] Furthermore, the concentration sensor is also installed on the first air inlet pipe to measure the concentration of VOCs in the exhaust gas before it is treated by the exhaust gas processor.

[0008] Using the above technical solution, the concentration of VOCs in the exhaust gas before treatment by the exhaust gas processor is measured and compared with the concentration of VOCs in the exhaust gas after treatment by the exhaust gas processor to determine whether the exhaust gas processor has reached adsorption saturation.

[0009] Furthermore, the number of exhaust gas processors is two or more, and each exhaust gas processor is arranged in parallel between the main air inlet pipe and the main air outlet pipe, and each exhaust gas processor is provided with a concentration sensor in its corresponding first air inlet pipe and first air outlet pipe.

[0010] By using the above technical solutions, multiple waste gas processors can be set up, which can work simultaneously to improve treatment efficiency, or a single waste gas processor can work and start another waste gas processor to continue working after adsorption saturation, thus continuously adsorbing VOCs waste gas.

[0011] Furthermore, the control assembly also includes a flow sensor, which is disposed on the main intake manifold, and the controller is electrically connected to the flow sensor.

[0012] The above technical solution uses a flow sensor to measure the industrial exhaust flow rate entering the main intake pipe. Based on the flow rate, multiple exhaust gas processors can be selected to work simultaneously or a single exhaust gas processor can be selected to work, thereby improving adsorption efficiency.

[0013] Furthermore, the electric valves are respectively installed on the first air outlet pipe and the second air outlet pipe, and the electric valve on the first air outlet pipe and the electric valve on the first air inlet pipe open or close simultaneously; the electric valve on the second air outlet pipe and the electric valve on the second air inlet pipe open or close simultaneously.

[0014] Through the above technical solution, when the waste gas processor performs the waste gas adsorption process, the electric valves of the first inlet pipe and the first outlet pipe are opened, and the electric valves of the second inlet pipe and the second outlet pipe are closed; the opposite is true when performing the waste gas desorption process, so as to avoid cross-contamination.

[0015] Furthermore, the incinerator includes a combustion chamber and a heat exchange chamber capable of heat exchange; the outlet of the combustion chamber is connected to the outside, and the inlet of the combustion chamber is connected to the desorption combustion channel; the inlet of the heat exchange chamber is connected to an external fan, and the outlet of the heat exchange chamber is connected to a hot air channel.

[0016] By using the above technical solution, the heat generated from the combustion of high-concentration VOCs waste gas in the combustion chamber can be used to heat the hot air required for the waste gas desorption process, thereby improving economic efficiency.

[0017] Furthermore, the control assembly also includes a temperature sensor, which is disposed on the inner wall of the heat exchange chamber and electrically connected to the controller.

[0018] The above technical solution is used to detect whether the temperature of the heat exchange chamber reaches the temperature of the hot air required for the desorption process of heated waste gas.

[0019] Furthermore, the desorption combustion assembly also includes a desorption fan, which is disposed in the desorption combustion channel and located between the waste gas processor and the incinerator; the desorption fan is electrically connected to the controller.

[0020] The above technical solution provides power to the desorption fan, thereby accelerating the desorption efficiency of the waste gas desorption process.

[0021] Furthermore, the exhaust gas processor is a zeolite bed.

[0022] Furthermore, the combustion chamber is a CO combustion chamber, an RCO combustion chamber, a TO combustion chamber, or an RTO combustion chamber.

[0023] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0024] Figure 1 A schematic diagram illustrating the working principle of the waste gas treatment equipment provided by this utility model;

[0025] Figure 2 A schematic diagram of the waste gas treatment equipment provided by this utility model;

[0026] Figure 3 A schematic diagram of the control assembly provided by this utility model. Detailed Implementation

[0027] The applicant conducted research and analysis on existing VOCs waste gas treatment equipment and found that the reason why existing VOCs waste gas treatment equipment still causes environmental pollution is that the existing VOCs waste gas treatment equipment is not equipped with a detection device. Based on production experience, the staff manually switches the adsorption and desorption processes of the VOCs waste gas treatment equipment every 7 days. This easily leads to the adsorption device not performing desorption work in time after adsorption saturation, so that VOCs waste gas is discharged into the outside world without being fully treated, causing environmental pollution.

[0028] Based on this, the applicant proposes a VOCs waste gas treatment device. This device adsorbs low-concentration VOCs waste gas through a waste gas processor. Concentration sensors are installed on the first inlet and first outlet pipes of the waste gas processor to detect the VOCs concentration before and after treatment. The detection results determine whether the waste gas processor is saturated. A return pipe connecting the main inlet and outlet pipes is also provided. Controlled by an electric valve, when the concentration sensor detects that the VOCs concentration in the exhaust gas exceeds the standard, the exhaust gas is returned, thereby preventing environmental pollution. The following is one embodiment of the VOCs waste gas treatment device provided by this utility model:

[0029] Please refer to Figures 1 to 3 , Figure 1 A schematic diagram illustrating the working principle of the waste gas treatment equipment provided by this utility model; Figure 2 A schematic diagram of the waste gas treatment equipment provided by this utility model; Figure 3 A schematic diagram of the control assembly provided by this utility model.

[0030] This utility model provides a VOCs waste gas treatment device, including an adsorption assembly 1, a desorption combustion assembly 2, and a control assembly 3.

[0031] The adsorption assembly 1 is used to adsorb low-concentration VOCs waste gas from industrial exhaust and accumulate it into high-concentration VOCs waste gas. It includes a main inlet pipe 11, a main outlet pipe 12, and waste gas processors 13. The main inlet pipe 11 is connected to the production equipment, and the main outlet pipe 12 is connected to the outside environment. There are two or more waste gas processors 13, connected in parallel between the main inlet pipe 11 and the main outlet pipe 12. Each waste gas processor 13 has a waste gas inlet 131, a waste gas outlet 132, a first inlet pipe 133, and a first outlet pipe 134. The waste gas inlet 131 is connected to the main inlet pipe 11 through the first inlet pipe 133, and the waste gas outlet 132 is connected to the main outlet pipe 12 through the first outlet pipe 134. When the production equipment supplies industrial exhaust gas into the main air inlet pipe 11, multiple exhaust gas processors 13 can work simultaneously to adsorb VOCs exhaust gas, or a single exhaust gas processor 13 can work alone to adsorb VOCs exhaust gas. In this embodiment, the number of exhaust gas processors 13 is four, and zeolite beds, which are existing technologies, can be selected. The porous structure of the zeolite bed can effectively capture VOCs molecules and has a good adsorption effect on VOCs exhaust gas.

[0032] The desorption combustion assembly 2 is used to separate the accumulated high-concentration VOCs waste gas from the waste gas processor 13 and perform combustion treatment. It includes an incinerator 21, a hot air passage 22, and a desorption combustion passage 23. The incinerator 21 includes a combustion chamber 211 and a heat exchange chamber 212, which can exchange heat with the combustion chamber 211. The outlet of the combustion chamber 211 is connected to the outside, and the inlet of the combustion chamber 211 is connected to the desorption combustion passage 23. The inlet of the heat exchange chamber 212 is connected to an external fan, and the outlet of the heat exchange chamber 212 is connected to the hot air passage 22. Each waste gas processor 13 is also provided with a hot air inlet 135, a hot air outlet 136, a second inlet pipe 137, and a second outlet pipe 138. The hot air inlet 135 is connected to the hot air passage 22 through the second inlet pipe 137, and the hot air outlet 136 is connected to the desorption combustion passage 23 through the second outlet pipe 138. When the exhaust gas processor 13 needs to perform desorption treatment, the fan blows hot air into the VOCs exhaust gas treatment equipment. The hot air enters the exhaust gas processor 13 through the hot air inlet 135. The high-temperature hot air causes the high-concentration VOCs exhaust gas to be desorbed from the exhaust gas processor 13 and enters the combustion chamber 211 through the hot air outlet 136 for high-temperature combustion, ultimately turning into carbon dioxide and water for harmless discharge. At the same time, the heat generated by combustion in the combustion chamber 211 can exchange heat with the heat exchange chamber 212 to heat the air input by the fan. At this time, the fan only needs to blow in cold air without additional heating, improving economic efficiency. In this embodiment, the combustion chamber 211 is a CO combustion chamber in the prior art. By adding a catalyst, the ignition point of the VOCs exhaust gas is lowered, allowing it to burn at a relatively low temperature to generate carbon dioxide and water, thereby reducing energy consumption. In other embodiments, the combustion chamber 211 can also be a conventional RTO combustion chamber, TO combustion chamber, RCO combustion chamber, etc., and is not limited to these.

[0033] Furthermore, the desorption combustion assembly also includes a desorption fan 24, which is disposed in the desorption combustion channel 23 and located between the waste gas processor 13 and the incinerator 21. The desorption fan 24 increases the flow rate of high-concentration VOCs waste gas in the desorption combustion channel 23, thereby improving the desorption efficiency.

[0034] The control assembly 3 is used to control the adsorption and desorption processes of the waste gas processor 13, and includes a flow sensor 31, a concentration sensor 32, an electric valve 33, and a controller. The flow sensor 31 is installed on the main inlet pipe 11 and is used to detect the flow rate of the industrial exhaust gas entering the production equipment. The flow sensor 31 can be an anemometer, a technology currently available. Several electric valves 33 are installed on the first inlet pipe 133 and the second inlet pipe 137 of each waste gas processor 13, and are used to control the opening and closing of the first inlet pipe 133 and the second inlet pipe 137. Several concentration sensors 32 are installed on the first inlet pipe 133 and the first outlet pipe 134 of each waste gas processor 13, and are used to detect the VOCs concentration of the industrial exhaust gas before and after treatment by each waste gas processor 13. The controller is electrically connected to the flow sensor 31, the concentration sensor 32, the electric valve 33, and the desorption fan 24, respectively, and controls the opening and closing of the electric valve 33 and / or the desorption fan 24 according to the detection results of the flow sensor 31 and the concentration sensor 32.

[0035] Furthermore, the electric valve 33 is also installed on the first exhaust pipe 134 and the second exhaust pipe 138 to control the opening and closing of the first exhaust pipe 134 and the second exhaust pipe 138, so as to prevent the industrial exhaust gas from entering the second exhaust pipe 138 when the exhaust gas processor 13 adsorbs low-concentration VOCs exhaust gas, or the high-concentration VOCs exhaust gas from entering the first exhaust pipe 134 when the exhaust gas processor 13 desorbs and separates high-concentration VOCs exhaust gas, thus preventing cross-contamination.

[0036] Furthermore, the adsorption assembly 1 also includes a return pipe 14, which is connected to the main inlet pipe 11 and the main outlet pipe 12. The electric valve 33 is also installed on the return pipe 14 and near the outlet of the main outlet pipe 12, controlling the opening and closing of the return pipe 14 and the outlet of the main outlet pipe 12. During normal operation, the return pipe 14 is disconnected, and the main outlet pipe 12 opens to exhaust gas. When the concentration sensor 32 installed on the first outlet pipe 134 detects that the VOCs concentration in the gas discharged from the exhaust gas processor 13 exceeds the standard, the return pipe 14 is opened and the opening of the main outlet pipe 12 is closed, allowing the gas to return to the main inlet pipe 11 and be adsorbed by the exhaust gas processor 13, thus preventing environmental pollution.

[0037] Furthermore, the control assembly 3 also includes a temperature sensor (not shown), which is disposed on the inner wall of the heat exchange chamber 212 and is used to measure the internal temperature of the heat exchange chamber 212. The temperature sensor is electrically connected to the controller. When the temperature sensor detects that the temperature is below the target, the external fan blows in hot air; when the temperature sensor detects that the temperature is within the target, the external fan blows in cold air, thereby improving economic efficiency.

[0038] The VOCs waste gas treatment equipment provided by this utility model has two working modes, and its working principle is as follows:

[0039] Mode 1: When the flow sensor 31 detects a low industrial exhaust flow rate into the main intake pipe 11, the controller controls one of the exhaust gas processors 13 to operate, while the electric valves 33 on the first intake pipes 133 of the other exhaust gas processors 13 remain closed. When adsorbing low-concentration VOCs exhaust gas, the electric valves on the first intake pipe 133 and the first outlet pipe 134 are opened, while the electric valves on the second intake pipe 137 and the second outlet pipe 138 are closed. The industrial exhaust gas enters the exhaust gas processor 13 from the first intake pipe 133 for adsorption treatment, and then is discharged through the first outlet pipe 134 and the main outlet pipe 12. The concentration sensor 32 detects the VOCs concentration of the gas before and after treatment by the exhaust gas processor 13. When the VOCs concentration of the gas after treatment by the exhaust gas processor 13 exceeds the standard, the electric valves on the first inlet pipe 133 and the first outlet pipe 134 corresponding to the exhaust gas processor 13 are closed, and the electric valves on the second inlet pipe 137 and the second outlet pipe 138 corresponding to the exhaust gas processor 13 are opened for desorption treatment. At the same time, the electric valve near the outlet of the main outlet pipe 12 is closed, and the electric valve of the return pipe 14 is opened to allow the VOCs exhaust gas with excessive concentration to flow back to the main inlet pipe 11. The electric valves on the first inlet pipe 133 and the first outlet pipe 134 corresponding to another exhaust gas processor 13 are opened to start the other exhaust gas processor 13. After the concentration sensor 32 detects that the VOCs exhaust gas concentration meets the standard, the electric valve on the return pipe 14 is closed and the electric valve near the outlet of the main outlet pipe 12 is opened to allow the treated gas to be discharged normally to the outside.

[0040] Mode 2: When the flow sensor 31 detects a large industrial exhaust flow rate entering the main air inlet pipe 11, the controller controls multiple exhaust gas processors 13 to operate simultaneously, while at least one exhaust gas processor 13 is disabled as a backup. When an exhaust gas processor 13 becomes saturated and begins desorption to separate high-concentration VOCs exhaust gas, the backup exhaust gas processor 13 is activated to replace it for exhaust gas adsorption. During this process, the saturated exhaust gas processor 13 can be replaced with a desorption process to ensure the continuous operation of the VOCs exhaust gas treatment equipment.

[0041] Compared with existing technologies, the waste gas treatment equipment provided by this utility model has the following advantages:

[0042] (1) A flow sensor 31 is installed in the main air inlet pipe 11 to detect the flow rate of industrial exhaust gas entering the exhaust gas treatment equipment. When the flow rate is small, a single exhaust gas processor 13 works, and when the flow rate is large, multiple exhaust gas processors 13 work at the same time. The working mode can be flexibly switched according to the flow rate, which improves the treatment efficiency of VOCs exhaust gas and avoids the single exhaust gas processor 13 from being impacted by large flow industrial exhaust gas, thus reducing its lifespan.

[0043] (2) A return pipe 14 is provided. When the first outlet pipe 134 corresponding to the exhaust gas processor 13 detects that the concentration of VOCs exhaust gas in the treated gas exceeds the standard, the excess VOCs exhaust gas can be recovered through the return pipe 14 to avoid polluting the environment.

[0044] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and this utility model also intends to include these modifications and variations.

Claims

1. A VOCs waste gas treatment device, characterized in that, include: The adsorption assembly includes a main inlet pipe, a main outlet pipe, an exhaust gas processor, and a return pipe; the return pipe is connected between the main inlet pipe and the main outlet pipe. The exhaust gas processor is provided with an exhaust gas inlet, an exhaust gas outlet, a first intake pipe, a first exhaust pipe, a hot air inlet, a hot air outlet, a second intake pipe, and a second exhaust pipe; the exhaust gas inlet is connected to the main intake pipe through the first intake pipe, and the exhaust gas outlet is connected to the main exhaust pipe through the first exhaust pipe. The desorption combustion assembly includes an incinerator, a hot air duct, and a desorption combustion channel; the outlet of the incinerator is connected to the outside, the inlet of the incinerator is connected to one end of the desorption combustion channel, and the other end of the desorption combustion channel is connected to the hot air outlet through a second air outlet pipe; one end of the hot air duct is connected to an external fan, and the other end is connected to the hot air inlet through a second air inlet pipe. The control assembly includes a concentration sensor, an electric valve, and a controller; the concentration sensor is disposed on the first outlet pipe, and the electric valve is disposed on the first inlet pipe, the second inlet pipe, the return pipe, and near the outlet of the main outlet pipe; The controller is electrically connected to the concentration sensor and the electric valve, receives the measurement information from the concentration sensor and controls the opening and closing of each electric valve respectively, and the electric valve on the first air inlet pipe and the electric valve on the second air inlet pipe do not open at the same time, and the electric valve on the return pipe and the electric valve near the outlet of the main air outlet pipe do not open at the same time.

2. The VOCs exhaust treatment device according to claim 1, characterized in that: The concentration sensor is also installed on the first air inlet pipe to measure the concentration of VOCs in the exhaust gas before it is processed by the exhaust gas processor.

3. The VOCs exhaust treatment device of claim 2, wherein: The number of exhaust gas processors is two or more, and each exhaust gas processor is arranged in parallel between the main air inlet pipe and the main air outlet pipe. Each exhaust gas processor is equipped with a concentration sensor in its corresponding first air inlet pipe and first air outlet pipe.

4. The VOCs exhaust treatment device of claim 3, wherein: The control assembly also includes a flow sensor, which is disposed on the main intake manifold, and the controller is electrically connected to the flow sensor.

5. The VOCs exhaust treatment device according to any one of claims 1-4, characterized in that: The electric valves are also respectively installed on the first air outlet pipe and the second air outlet pipe. The electric valve on the first air outlet pipe and the electric valve on the first air inlet pipe open or close simultaneously; the electric valve on the second air outlet pipe and the electric valve on the second air inlet pipe open or close simultaneously.

6. The VOCs exhaust treatment device of claim 1, wherein: The incinerator includes a combustion chamber and a heat exchange chamber capable of heat exchange; the outlet of the combustion chamber is connected to the outside, and the inlet of the combustion chamber is connected to the desorption combustion channel; the inlet of the heat exchange chamber is connected to an external fan, and the outlet of the heat exchange chamber is connected to a hot air channel.

7. The VOCs exhaust treatment device of claim 6, wherein: The control assembly also includes a temperature sensor, which is disposed on the inner wall of the heat exchange chamber and electrically connected to the controller.

8. The VOCs exhaust treatment device of claim 1, wherein: The desorption combustion assembly also includes a desorption fan, which is disposed in the desorption combustion channel and located between the waste gas processor and the incinerator; the desorption fan is electrically connected to the controller.

9. The VOCs waste gas treatment equipment according to claim 1, characterized in that: The exhaust gas processor is a zeolite bed.

10. The VOCs exhaust treatment device of claim 6, wherein: The combustion chamber is a CO combustion chamber, an RCO combustion chamber, a TO combustion chamber, or an RTO combustion chamber.

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