An automobile painting plant exhaust gas treatment system
Through the integrated design of multi-stage purification units, the problems of high equipment redundancy and high energy consumption in the exhaust gas treatment system of automotive painting workshops have been solved, achieving efficient treatment of exhaust gas from the paint booth and drying exhaust gas, meeting emission standards and reducing energy consumption.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DESIGN INST NO 9 MINISTRY OF MECHINE BUILDING
- Filing Date
- 2025-06-25
- Publication Date
- 2026-07-03
AI Technical Summary
Existing exhaust gas treatment systems in automotive painting workshops suffer from problems such as high equipment redundancy, poor operational stability, and high energy consumption when facing large fluctuations in paint spraying exhaust gas concentration and high drying exhaust gas temperature. They are unable to achieve coordinated treatment of multiple types of exhaust gases.
The automotive painting workshop exhaust gas treatment system, which employs the synergistic effect of multi-stage purification units, includes a rotary pre-filter box, primary and secondary concentration rotors, a clean air fan, a secondary concentration rotor desorption fan, a primary concentration rotor desorption fan, an RTO pre-filter box, a primary concentration rotor heat exchanger, and an electrically heated RTO. Through the integrated design of the multi-stage purification units, it can adapt to wide concentration fluctuations and high-temperature exhaust gases, achieving efficient exhaust gas treatment.
It achieves integrated treatment of exhaust gas from the paint spraying booth and drying booth, meets national pollutant emission standards, reduces equipment redundancy and energy consumption, and improves the economy and stability of operation.
Smart Images
Figure CN224454626U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of industrial waste gas treatment technology, specifically a waste gas treatment system for automobile painting workshops. Background Technology
[0002] In the field of exhaust gas treatment in painting workshops, the most common exhaust gases include paint spraying exhaust and drying exhaust. With the increasing automation of paint booths, the exhaust gas volume is decreasing while the concentration is increasing. Existing systems have limited capacity to handle concentration fluctuations in exhaust gases. Currently, the common technology for exhaust gas treatment in automotive painting workshops is "one-stage concentrator + regenerative thermal oxidizer (RTO)," which has significant limitations: Firstly, the concentration fluctuation range of paint spraying exhaust is large, and a single-stage rotor needs to maintain a treatment efficiency of over 98% under peak concentration conditions to meet emission standards, resulting in poor operational stability and the risk of exceeding standards. Secondly, drying exhaust gas, due to its excessively high temperature (often exceeding 150℃), exceeds the rotor's tolerance range, requiring a separate high-temperature RTO incineration treatment, leading to a significant increase in system energy consumption. Existing technologies cannot achieve synergistic treatment of multiple types of exhaust gases, have high equipment redundancy, and poor operational economy. There is an urgent need to develop an integrated treatment solution that can adapt to wide concentration fluctuations and withstand high temperatures. This system targets exhaust gas concentration fluctuations within the range of 500-1500 mg / Nm³ before treatment. 3 The emission concentration after treatment using this system must be less than or equal to 15 mg / Nm³. 3 . Utility Model Content
[0003] The purpose of this invention is to provide a waste gas treatment system for automotive painting workshops to solve the above-mentioned problems.
[0004] To achieve the above objectives, the following technical solutions are provided:
[0005] A waste gas treatment system for an automotive painting workshop, used to treat raw paint spraying waste gas and drying waste gas from the paint booth, includes a rotary pre-filter box, a primary concentrator rotary wheel, a secondary concentrator rotary wheel, a clean air blower, a secondary concentrator rotary wheel desorption blower, a primary concentrator rotary wheel desorption blower, an RTO pre-filter box, a primary concentrator rotary wheel heat exchanger, and an electrically heated RTO.
[0006] One end of the pre-filter box is connected to the original paint exhaust gas inlet of the paint booth and the secondary concentrator desorption fan, respectively. The other end of the pre-filter box is connected to the first input end and the second input end of the primary concentrator. The first output end of the primary concentrator is connected to the first input end and the second input end of the secondary concentrator and the input end of the clean air blower, respectively. The output end of the clean air blower is connected to the outside through a chimney.
[0007] The second output terminal of the primary concentrator rotor is connected to the first input terminal of the primary concentrator rotor desorption heat exchanger; the third input terminal of the primary concentrator rotor is connected to the first output terminal of the primary concentrator rotor desorption heat exchanger; the third output terminal of the primary concentrator rotor is connected to the input terminal of the primary concentrator rotor desorption fan; the output terminal of the primary concentrator rotor desorption fan is connected to the input terminal of the RTO pre-filter box; the output terminal of the RTO pre-filter box is connected to the input terminal of the electrically heated RTO; and the first output terminal of the electrically heated RTO is connected to the outside through a chimney.
[0008] Preferably, the exhaust gas treatment system for the automotive painting workshop further includes a secondary concentrator rotary heat exchanger, wherein the first output end of the secondary concentrator is connected to the input end of the clean air blower, the second output end of the secondary concentrator is connected to the first input end of the secondary concentrator rotary heat exchanger, the first output end of the secondary concentrator rotary heat exchanger is connected to the second input end of the secondary concentrator, and the third output end of the secondary concentrator is connected to the secondary concentrator desorption blower.
[0009] Preferably, the second output terminal of the electric heating RTO is connected to the second input terminal of the first-stage rotary desorption heat exchanger through an internal air mixer, and the second output terminal of the first-stage rotary desorption heat exchanger is connected to the outside through a chimney.
[0010] Preferably, the second output terminal of the electrically heated RTO is connected to the second input terminal of the secondary concentration rotary heat exchanger through an internal air mixer, and the second output terminal of the secondary concentration rotary heat exchanger is connected to the outside through a chimney.
[0011] Preferably, the input end of the RTO pre-filter box is also connected to the drying exhaust gas inlet of the paint spraying chamber.
[0012] Preferably, a waste heat recovery device is also provided between the first output end of the electric heating RTO and the chimney.
[0013] Preferably, a secondary concentration wheel bypass valve is provided between the first output end of the primary concentration wheel and the clean air blower, and a secondary concentration wheel inlet valve is also provided between the first output end of the primary concentration wheel and the secondary concentration wheel.
[0014] Preferably, the inlet of the original paint spraying exhaust gas in the spray booth is also equipped with an inlet exhaust gas concentration detector.
[0015] The beneficial effects of this invention are as follows: This invention is applicable to the comprehensive treatment of typical high-concentration pollution sources such as paint spraying exhaust gas and drying exhaust gas generated during automobile manufacturing. Through the synergistic effect of multi-stage purification units, it effectively treats complex pollutants such as volatile organic compounds (VOCs), particulate matter, and odorous gases contained in the exhaust gas. The system is specifically optimized for the characteristics of large concentration fluctuations and complex composition of painting exhaust gas, integrating pretreatment, thermal oxidation, adsorption and recovery process modules to ensure treatment efficiency under different operating conditions and meet national and local pollutant emission standards.
[0016] This invention can meet the requirements of exhaust gas treatment systems in automotive painting workshops, which have high concentrations and large fluctuations in exhaust gas concentration. It also integrates drying exhaust gas and painting exhaust gas into the same system for treatment.
[0017] This invention allows for the selection of two-stage rotors to operate simultaneously or individually, depending on the concentration of exhaust gas in the paint spray booth.
[0018] This invention uses an electrically heated RTO, which can effectively reduce nitrogen oxide emissions in exhaust gas.
[0019] This invention features an electrically heated RTO high-temperature furnace mixing device, which can address the issue of overheating when the concentration of exhaust gas at the RTO inlet is too high.
[0020] This invention incorporates a waste heat recovery device after the electric heating RTO, which can recover excess heat and achieve energy saving. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the structure of this utility model;
[0022] The attached diagram is labeled as follows: 1-Pre-filter box for the rotary drum, 2-First-stage concentrator rotary drum, 3-Bypass valve for the second-stage concentrator rotary drum, 4-Inlet valve for the second-stage concentrator rotary drum, 5-Second-stage concentrator rotary drum, 6-Clean air fan, 7-Heat exchanger for the second-stage concentrator rotary drum, 8-Waste heat recovery device, 9-Desorption fan for the second-stage concentrator rotary drum, 10-Desorption fan for the first-stage concentrator rotary drum, 11-Pre-filter box for the RTO, 12-Heat exchanger for the first-stage concentrator rotary drum, 13-Electric heating RTO, 14-Inlet exhaust gas concentration detector, 15-Mixer. Detailed Implementation
[0023] The following is a detailed description of this design scheme with reference to the accompanying drawings:
[0024] like Figure 1As shown, an exhaust gas treatment system for an automotive painting workshop is used to treat the original paint spraying exhaust gas and drying exhaust gas in the paint booth. It includes a rotary pre-filter box 1, a primary concentrator rotary wheel 2, a secondary concentrator rotary wheel 5, a clean air fan 6, a secondary concentrator rotary wheel desorption fan 9, a primary concentrator rotary wheel desorption fan 10, an RTO pre-filter box 11, a primary concentrator rotary wheel heat exchanger 12, and an electrically heated RTO 13.
[0025] One end of the pre-filter box 1 is connected to the original paint spraying exhaust gas inlet of the paint booth and the secondary concentration rotor desorption fan 9, respectively. The other end of the pre-filter box 1 is connected to the first input end and the second input end of the primary concentration rotor 2, respectively. The first output end of the primary concentration rotor 2 is connected to the first input end, the second input end of the secondary concentration rotor 5 and the input end of the clean air fan 6, respectively. The output end of the clean air fan 6 is connected to the outside through a chimney. The drying exhaust gas passes through the secondary concentration rotor 5 and is mixed with the paint spraying exhaust gas by the secondary concentration rotor desorption fan 9 before entering the pre-filter box 1 for pre-filtration to ensure the cleanliness of the gas before entering the concentration rotor.
[0026] The second output terminal of the primary concentrator rotor 2 is connected to the first input terminal of the primary concentrator desorption heat exchanger 12; the third input terminal of the primary concentrator rotor 2 is connected to the first output terminal of the primary concentrator desorption heat exchanger 12; the third output terminal of the primary concentrator rotor 2 is connected to the input terminal of the primary concentrator desorption fan 10; the output terminal of the primary concentrator desorption fan 10 is connected to the input terminal of the RTO pre-filter box 11; and the output terminal of the RTO pre-filter box 11 is connected to the input terminal of the electrically heated RTO 13. The first output end of the heating RTO13 is connected to the outside through the chimney. The cooling air of the first-stage concentration rotor 2 is heated by the first-stage rotor desorption heat exchanger 12 and then desorbed in reverse. The concentrated exhaust gas after desorption passes through the first-stage concentration rotor desorption fan 10 to the RTO pre-filter box 11 and mixes with the drying exhaust gas before being discharged to the electrically heated RTO13 for treatment. The heat exchanger 12 of the first-stage concentration rotor desorption heat exchanger draws air from the furnace of the electrically heated RTO13 for heat exchange before being discharged to the chimney.
[0027] In some embodiments, the exhaust gas treatment system for automotive painting workshops further includes a secondary concentrator rotary heat exchanger 7. The first output end of the secondary concentrator 5 is connected to the input end of the clean air blower 6, the second output end of the secondary concentrator 5 is connected to the first input end of the secondary concentrator rotary heat exchanger 7, the first output end of the secondary concentrator rotary heat exchanger 7 is connected to the second input end of the secondary concentrator 5, and the third output end of the secondary concentrator 5 is connected to the secondary concentrator desorption blower 9. The second output end of the electrically heated RTO 13 is connected to the internal mixer 1. 5 is connected to the second input end of the secondary concentration rotary heat exchanger 7, and the second output end of the secondary concentration rotary heat exchanger 7 is connected to the outside through the chimney. The cooling air of the secondary concentration rotary 5 is heated by the secondary concentration rotary desorption heat exchanger 7 and then desorbed in reverse. After desorption, the concentrated exhaust gas is discharged to the inlet of the pre-filter box 1 of the rotary 5 through the secondary concentration rotary desorption fan 9 and mixed with the original paint spraying exhaust gas of the paint spraying room before re-entering the rotary 5. The heat measurement of the secondary concentration rotary heat exchanger 7 is obtained from the electric heating RTO13 furnace for heat exchange and then discharged to the chimney.
[0028] In some embodiments, the second output terminal of the electric heating RTO 13 is connected to the second input terminal of the first-stage rotary desorption heat exchanger 12 through the air mixer 15 provided inside it. The second output terminal of the first-stage rotary desorption heat exchanger 12 is connected to the outside through the chimney. When the furnace temperature of the electric heating RTO 13 is too high, air can be drawn from the high-temperature furnace 13 through the air mixer 15 to ensure that the temperature of the RTO furnace 13 is normal.
[0029] In some embodiments, the input end of the RTO pre-filter box 11 is also connected to the drying exhaust gas inlet of the paint spraying chamber. The high-temperature drying exhaust gas in the RTO pre-filter box 11 is mixed with the exhaust gas concentrated by the primary concentrator 2 and then filtered by the primary concentrator desorption fan 10 to the electrically heated RTO pre-filter box 11 before being sent to the electrically heated RTO 13 for incineration and then discharged.
[0030] In some embodiments, a waste heat recovery device 8 is also provided between the first output end of the electric heating RTO13 and the chimney. Before the exhaust gas of the electric heating RTO13 is discharged, the energy can be further recovered by the waste heat recovery device 8, thereby saving energy.
[0031] In some embodiments, a secondary concentrator bypass valve 3 is provided between the first output end of the primary concentrator 2 and the clean air blower 6, and a secondary concentrator inlet valve 4 is provided between the first output end of the primary concentrator 2 and the secondary concentrator 5; an inlet exhaust gas concentration detector 14 is also provided at the original paint spraying exhaust gas inlet of the paint spraying room.
[0032] The original paint spraying exhaust gas in the spray booth is detected by the inlet exhaust gas concentration detector 14. When the original paint spraying exhaust gas concentration in the spray booth is high, the secondary concentration wheel inlet valve 4 is opened and the secondary concentration wheel bypass valve 3 is closed. After the exhaust gas is adsorbed twice by the secondary concentration wheel 5, the clean gas is discharged through the clean fan 6 to ensure that the emission meets the standards.
[0033] When the concentration of the original paint spraying exhaust gas in the spray booth is low, the inlet valve 4 of the secondary concentration rotor is closed and the bypass valve 3 of the secondary concentration rotor is opened. The exhaust gas is only adsorbed by the primary concentration rotor 2, and the clean gas is discharged through the clean fan 6 to ensure that the emission meets the standards.
[0034] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
Claims
1. A waste gas treatment system for an automotive painting workshop, used to treat raw painting waste gas and drying waste gas from the paint booth, characterized in that: It includes a pre-filter box (1), a primary concentrator rotor (2), a secondary concentrator rotor (5), a clean air blower (6), a secondary concentrator rotor desorption blower (9), a primary concentrator rotor desorption blower (10), an RTO pre-filter box (11), a primary concentrator rotor heat exchanger (12), and an electrically heated RTO (13). One end of the pre-filter box (1) is connected to the original paint exhaust gas inlet of the paint booth and the secondary concentration wheel desorption fan (9) respectively. The other end of the pre-filter box (1) is connected to the first input end and the second input end of the primary concentration wheel (2) respectively. The first output end of the primary concentration wheel (2) is connected to the first input end, the second input end of the secondary concentration wheel (5) and the input end of the clean air blower (6) respectively. The output end of the clean air blower (6) is connected to the outside through the chimney. The second output end of the primary concentrator (2) is connected to the first input end of the primary concentrator desorption heat exchanger (12), the third input end of the primary concentrator (2) is connected to the first output end of the primary concentrator desorption heat exchanger (12), the third output end of the primary concentrator (2) is connected to the input end of the primary concentrator desorption fan (10), the output end of the primary concentrator desorption fan (10) is connected to the input end of the RTO pre-filter box (11), the output end of the RTO pre-filter box (11) is connected to the input end of the electric heating RTO (13), and the first output end of the electric heating RTO (13) is connected to the outside through the chimney.
2. The automobile painting plant exhaust gas treatment system according to claim 1, characterized in that, The exhaust gas treatment system for the automotive painting workshop also includes a secondary concentrator rotary heat exchanger (7). The first output end of the secondary concentrator (5) is connected to the input end of the clean air blower (6). The second output end of the secondary concentrator (5) is connected to the first input end of the secondary concentrator rotary heat exchanger (7). The first output end of the secondary concentrator rotary heat exchanger (7) is connected to the second input end of the secondary concentrator (5). The third output end of the secondary concentrator (5) is connected to the secondary concentrator desorption blower (9).
3. The automobile painting plant exhaust gas treatment system according to claim 1, characterized in that, The second output terminal of the electric heating RTO (13) is connected to the second input terminal of the first-stage rotary desorption heat exchanger (12) through the air mixer (15) provided inside it, and the second output terminal of the first-stage rotary desorption heat exchanger (12) is connected to the outside through the chimney.
4. The exhaust treatment system for an automotive finishing plant according to claim 2 or 3, characterized in that, The second output end of the electric heating RTO (13) is connected to the second input end of the secondary concentration rotary heat exchanger (7) through the air mixer (15) provided inside it, and the second output end of the secondary concentration rotary heat exchanger (7) is connected to the outside through the chimney.
5. The automobile painting plant exhaust gas treatment system according to claim 1, characterized in that, The input end of the RTO pre-filter box (11) is also connected to the drying exhaust gas inlet of the paint spraying chamber.
6. The automobile painting plant exhaust gas treatment system according to claim 1, characterized in that, A waste heat recovery device (8) is also provided between the first output end of the electric heating RTO (13) and the chimney.
7. The automobile painting plant exhaust gas treatment system according to claim 1, characterized in that, A secondary concentrator bypass valve (3) is provided between the first output end of the primary concentrator (2) and the clean air blower (6), and a secondary concentrator inlet valve (4) is provided between the first output end of the primary concentrator (2) and the secondary concentrator (5).
8. The automobile painting plant exhaust gas treatment system according to claim 1, characterized in that, The original paint spraying exhaust gas inlet of the spray booth is also equipped with an inlet exhaust gas concentration detector (14).