Coating waste gas treatment device

Abstract

The utility model discloses a coating waste gas treatment device and belongs to the technical field of waste gas treatment. Comprising a paint mist filter, a rotating wheel thickener, an exhaust funnel, a heat accumulating type thermal oxidizer and a combustor, a gas inlet pipeline used for introducing coating waste gas is arranged on the paint mist filter, and a natural gas pipeline used for introducing natural gas is arranged on the combustor; the paint mist filter, the rotating wheel thickener and the exhaust funnel are connected through a pipeline; the rotating wheel thickener, the heat accumulating type thermal oxidizer and the exhaust funnel are connected through a pipeline; an adsorption fan and a valve A are arranged between the rotating wheel thickener and the exhaust funnel, a valve B and an RTO fan are arranged between the rotating wheel thickener and the heat storage type thermal oxidizer, and the combustor is arranged on the heat storage type thermal oxidizer; according to the coating waste gas treatment device, coating waste gas can be efficiently treated, low-concentration VOCs waste gas is concentrated into high-concentration waste gas, the follow-up RTO treatment efficiency is improved, and meanwhile energy consumption is reduced through the characteristics of an RTO heat accumulator.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of waste gas treatment, especially, a kind of coating waste gas treatment device. BACKGROUND

[0002] Coating waste gas refers to volatile organic compounds (VOCs) generated in the coating process, and the main components include benzene, toluene, xylene, ethyl acetate, propylene glycol monomethyl ether and other volatile organic compounds. These substances are volatilized from the coating during spraying, posing a threat to the environment and human health.

[0003] Existing coating waste gas treatment technologies are diverse, but each has its limitations. For example, although the physical adsorption method is simple to operate, the adsorption material needs to be replaced or regenerated regularly, and the operating cost is high. Although the biological degradation method has low equipment investment and operating cost, the treatment efficiency is affected by conditions such as microbial species, temperature and humidity, and the effect is not good for some difficult-to-degrade VOCs. The combustion method consumes fuel and may cause secondary pollution, and the treatment efficiency is not high for low-concentration VOCs waste gas. UTILITY MODEL CONTENT

[0004] The utility model aims to overcome the deficiencies in the prior art and provide a coating waste gas treatment device that can efficiently treat coating waste gas, concentrate low-concentration VOCs waste gas into high-concentration waste gas, and improve the subsequent RTO treatment efficiency while saving energy consumption by utilizing the characteristics of RTO heat storage.

[0005] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of a coating waste gas treatment device, which comprises a paint mist filter, a rotary concentrator, an exhaust pipe, a regenerative thermal oxidizer and a burner. An air inlet pipe is provided on the paint mist filter for the inlet of coating waste gas. A natural gas pipe is provided on the burner for the inlet of natural gas.

[0006] The paint mist filter and the rotary concentrator are connected by a pipe, and the rotary concentrator and the exhaust pipe are also connected by a pipe.

[0007] The rotary concentrator and the regenerative thermal oxidizer are connected by a pipe, and the regenerative thermal oxidizer and the exhaust pipe are also connected by a pipe.

[0008] An adsorption fan and a valve A are provided on the pipe between the rotary concentrator and the exhaust pipe. A valve B and an RTO fan are provided on the pipe between the rotary concentrator and the regenerative thermal oxidizer. The burner is installed on the regenerative thermal oxidizer.

[0009] Optionally, the heat storage type thermal oxidizer is provided with a heat source pipeline for outputting waste heat, and a heat exchanger is arranged at one end of the heat source pipeline away from the heat storage type thermal oxidizer, and the heat exchanger and the rotary concentrator are connected through two pipelines to form a closed loop of gas circulation.

[0010] Optionally, a valve C is arranged on the heat source pipeline to control the amount of air entering the heat exchanger.

[0011] Optionally, a three-way connecting pipe is arranged on the pipeline between the rotary concentrator and the heat storage type thermal oxidizer, the three-way connecting pipe is located between the valve B and the RTO fan, a gas pipeline for introducing fresh air is arranged on the three-way connecting pipe, and a valve D is arranged on the gas pipeline.

[0012] Optionally, the valve A, the valve B, the valve C and the valve D are all solenoid valves, and the valve A is always open.

[0013] Optionally, a combustion air fan is arranged on the burner to increase the flow rate of natural gas.

[0014] Optionally, the gas introduced through the gas inlet pipeline is waste gas containing low-concentration VOCs.

[0015] Compared with the prior art, the present application has the following beneficial effects:

[0016] (1) The VOCs waste gas to be treated is introduced through the gas inlet pipeline, the paint mist particles and other solid particles contained in the VOCs waste gas are removed through the paint mist filter, then the VOCs waste gas is filtered and treated through the rotary concentrator, and finally the treated gas is directly discharged through the exhaust cylinder. When the VOCs waste gas flow is large and the rotary concentrator is difficult to handle, the valve B and the RTO fan are opened to send the high-concentration VOCs waste gas concentrated by the rotary concentrator into the heat storage type thermal oxidizer for purification treatment, thereby realizing separate treatment of small-flow VOCs waste gas and large-flow VOCs waste gas, maximizing the treatment efficiency, and reducing energy consumption.

[0017] (2) When the heat storage type thermal oxidizer burns the waste gas, a large amount of heat source is generated, the heat exchanger is used to transfer the heat generated by the heat storage type thermal oxidizer to the air or gas entering the rotary concentrator, so that the rotary concentrator can obtain the required heat source during the desorption process, thereby reducing the energy consumption of the rotary concentrator. BRIEF DESCRIPTION OF DRAWINGS

[0018] The present application will be further described below in combination with the drawings and examples.

[0019] Figure 1 is a structure schematic view of the preferred embodiment of the present application.

[0020] Wherein, 1, paint mist filter; 2, rotating drum concentrator; 3, exhaust cylinder; 4, regenerative thermal oxidizer; 5, burner; 6, air inlet pipeline; 7, natural gas pipeline; 8, adsorption fan; 9, valve A; 10, valve B; 11, RTO fan; 12, heat source pipeline; 13, heat exchanger; 14, valve C; 15, three-way connecting pipe; 16, gas pipeline; 17, valve D; 18, combustion fan. DETAILED DESCRIPTION

[0021] The utility model will be explained in further detail in combination with the drawings and embodiments, these drawings are all simplified schematic diagram, only with the schematic way the basic structure of the utility model is explained, therefore it shows only the structure related to the utility model.

[0022] It should be noted that if the embodiments involve directional indications (such as up, down, bottom, top, etc.), the directional indications are only used to explain the relative position relationship, movement, etc. between the components in a certain posture, and if the specific posture changes, the directional indications will also change accordingly. The terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features with "first" and "second" can explicitly or implicitly include one or more features. Unless otherwise specified and limited, the terms "set", "connected", "connected" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be connected inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances. Example one

[0023] As shown in Figure 1 A kind of coating exhaust treatment device, including paint mist filter 1, rotating drum concentrator 2, exhaust cylinder 3, regenerative thermal oxidizer 4, burner 5, paint mist filter 1 is provided with air inlet pipeline 6 for passing into coating exhaust gas, burner 5 is provided with natural gas pipeline 7 for passing into natural gas;

[0024] Paint mist filter 1 and rotating drum concentrator 2, between rotating drum concentrator 2 and exhaust cylinder 3 are connected by pipeline;

[0025] Rotating drum concentrator 2 and regenerative thermal oxidizer 4, between regenerative thermal oxidizer 4 and exhaust cylinder 3 are connected by pipeline;

[0026] The pipeline between the rotary concentrator 2 and the exhaust cylinder 3 is provided with an adsorption fan 8 and a valve A 9, the pipeline between the rotary concentrator 2 and the regenerative thermal oxidizer 4 is provided with a valve B 10 and an RTO fan 11, and the burner 5 is installed on the regenerative thermal oxidizer 4.

[0027] In this embodiment, in order to efficiently process VOCs waste gas with different air volumes, low-concentration VOCs waste gas to be treated is continuously introduced through the inlet pipeline 6. The solid particles in the VOCs waste gas are first adsorbed and filtered by the paint mist filter 1 to pretreat the VOCs waste gas, ensuring the normal operation of the subsequent treatment equipment and prolonging the service life. Then the VOCs waste gas enters the rotary concentrator 2, which uses zeolite and other adsorbent materials to adsorb VOCs in the waste gas, thereby purifying and treating small-air-volume VOCs waste gas. Finally, the VOCs waste gas is discharged through the exhaust pipe. When large-air-volume VOCs waste gas needs to be treated, the rotary concentrator 2 can concentrate low-concentration VOCs waste gas into high-concentration waste gas. After the valve B 10 is opened, the RTO fan 11 sends the VOCs waste gas into the regenerative thermal oxidizer 4, which is burned by the burner 5. During the burning process, the VOCs are oxidized and decomposed into harmless carbon dioxide and water vapor. Finally, the VOCs waste gas is discharged through the exhaust cylinder 3, achieving the effect of efficiently treating VOCs waste gas. Example Two

[0028] As shown in Figure 1 , on the basis of example one, the regenerative thermal oxidizer 4 is provided with a heat source pipeline 12 for outputting waste heat. The heat source pipeline 12 is provided with a heat exchanger 13 at the end away from the regenerative thermal oxidizer 4. The heat exchanger 13 and the rotary concentrator 2 are connected by two pipelines to form a closed-loop gas circulation. The heat exchanger 13 can save energy consumption for the rotary concentrator 2.

[0029] As shown in Figure 1 , the heat source pipeline 12 is provided with a valve C 14 for controlling the amount of air entering the heat exchanger 13. The valve C 14 facilitates control of the amount of air entering the heat exchanger 13.

[0030] As shown in Figure 1 , a three-way connecting pipe 15 is provided on the pipeline between the rotary concentrator 2 and the regenerative thermal oxidizer 4. The three-way connecting pipe 15 is located between the valve B 10 and the RTO fan 11. The three-way connecting pipe 15 is provided with a gas pipeline 16 for introducing fresh air, and the gas pipeline 16 is provided with a valve D 17. By opening the valve D 17 on the gas pipeline 16, fresh air can be introduced to adjust the temperature and oxygen content in the regenerative thermal oxidizer 4.

[0031] As shown in Figure 1As shown, the valve A9, the valve B10, the valve C14 and the valve D17 are all electromagnetic valves, and the valve A9 is kept open to facilitate the control of the opening and closing of the pipelines.

[0032] As shown, the burner 5 is provided with a combustion air fan 18 for increasing the flow rate of the natural gas. Figure 1

[0033] In the embodiment, when the regenerative thermal oxidizer 4 is burning the exhaust gas, a large amount of heat source is generated, and then the residual heat in the regenerative thermal oxidizer 4 is conducted into the heat source pipeline by starting the valve C14, and then enters the heat exchanger 13, and then the heat is transferred to the air or gas entering the rotary concentrator 2 through the pipeline of the two closed-circuit cycles of the gas between the heat exchanger 13 and the rotary concentrator 2, so that the rotary concentrator 2 can obtain the required heat source in the desorption process, thereby reducing the energy consumption of the rotary concentrator 2 and preventing the waste of energy of the regenerative thermal oxidizer 4.

[0034] Working principle: the VOCs exhaust gas to be treated is introduced through the air inlet pipeline 6, the paint mist particles and other solid particles contained in the VOCs exhaust gas are removed through the paint mist filter 1, and then the VOCs exhaust gas is filtered through the rotary concentrator 2, and finally the treated gas is directly discharged through the exhaust cylinder 3. When the VOCs exhaust gas has a large air volume and the rotary concentrator 2 is difficult to process, the valve B10 and the RTO fan 11 are opened to send the high-concentration VOCs exhaust gas concentrated by the rotary concentrator 2 into the regenerative thermal oxidizer 4 for purification treatment, realizing the separate treatment of small-air-volume VOCs exhaust gas and large-air-volume VOCs exhaust gas, and maximizing the treatment efficiency to reduce energy consumption. When the regenerative thermal oxidizer 4 is burning the exhaust gas, a large amount of heat source is generated, and the heat generated by the regenerative thermal oxidizer 4 is transferred to the air or gas entering the rotary concentrator 2 through the heat exchanger 13, so that the rotary concentrator 2 can obtain the required heat source in the desorption process, thereby reducing the energy consumption of the rotary concentrator 2.

[0035] According to the ideal embodiment of the present application, the above description can be varied and modified without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the content of the specification, and must be determined according to the scope of the claims.​

Claims

1. A painting waste gas treatment device, characterized by: The invention comprises a paint mist filter (1), a rotary concentrator (2), an exhaust pipe (3), a regenerative thermal oxidizer (4), and a burner (5); the paint mist filter (1) is provided with an air intake pipe (6) for introducing painting exhaust gas, and the burner (5) is provided with a natural gas pipeline (7) for introducing natural gas; The paint mist filter (1) and the rotary concentrator (2), and the rotary concentrator (2) and the exhaust pipe (3) are connected via pipes; The rotary concentrator (2) and the regenerative thermal oxidizer (4), and the regenerative thermal oxidizer (4) and the exhaust pipe (3) are connected via pipelines; An adsorption fan (8) and a valve A (9) are provided on the pipeline between the rotary concentrator (2) and the exhaust pipe (3); a valve B (10) and an RTO fan (11) are provided on the pipeline between the rotary concentrator (2) and the regenerative thermal oxidizer (4); and the burner (5) is installed on the regenerative thermal oxidizer (4).

2. The painting waste gas treatment device according to claim 1, characterized in that: The regenerative thermal oxidizer (4) is provided with a heat source pipe (12) for outputting waste heat. A heat exchanger (13) is provided at one end of the heat source pipe (12) away from the regenerative thermal oxidizer (4). The heat exchanger (13) is connected to the rotary concentrator (2) via two pipes to form a closed gas circulation.

3. The painting exhaust gas treatment device according to claim 2, characterized in that: The heat source pipe (12) is provided with a valve C (14) for controlling the amount of air entering the heat exchanger (13).

4. The painting exhaust gas treatment device according to claim 1, characterized in that: A three-way connecting pipe (15) is provided on the pipeline between the rotary concentrator (2) and the regenerative thermal oxidizer (4), and the three-way connecting pipe (15) is located between the valve B (10) and the RTO blower (11). A gas pipeline (16) for introducing new air is provided on the three-way connecting pipe (15), and a valve D (17) is provided on the gas pipeline (16).

5. The painting exhaust gas treatment device according to claim 4, characterized in that: The valve A (9), valve B (10), valve C (14), and valve D (17) are all solenoid valves, and the valve A (9) is kept normally open.

6. The painting exhaust gas treatment device according to claim 1, characterized in that: The burner (5) is provided with a combustion-supporting blower (18) for increasing the flow rate of natural gas.

7. The painting exhaust gas treatment device according to claim 1, characterized in that: The gas introduced into the air inlet pipe (6) is waste gas containing low concentration of VOCs.

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