Automobile coating waste gas treatment system
The exhaust gas treatment system for automobile painting processes addresses high-volume, low-concentration exhaust gases by filtering, adsorbing, and incinerating them, achieving low emissions and energy efficiency through waste heat recovery.
Patent Information
- Application Number
- CN202411543563.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2024-12-20
AI Technical Summary
Existing automobile painting processes generate exhaust gases with high volumes and low concentrations, requiring separate treatment equipment for different concentrations, leading to increased costs and inefficient energy consumption, and traditional incineration methods are inadequate for meeting stringent emission standards.
An exhaust gas treatment system comprising a filtration system, zeolite wheel concentration system, and RTO incineration system, which filters, adsorbs, and incinerates exhaust gases, utilizing waste heat for desorption and heating, achieving low VOC emissions and energy efficiency.
The system effectively reduces VOC emissions below 15mg/m³, meets stringent emission standards, and recovers waste heat for heating, reducing operational and equipment costs while ensuring stable and reliable operation.
Smart Images
Figure CN119163980A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of automobile manufacturing, and in particular to an automobile painting exhaust gas treatment system. Background Art
[0002] At present, the requirements for exhaust gas emissions from paint spraying in automobile painting workshops at home and abroad are becoming more and more stringent. The exhaust gas concentration generated by the traditional solvent-based paint process in automobile painting workshops reaches 150mg / m³; the exhaust gas concentration generated by the water-based paint process is about 40mg / m³, which cannot meet the future exhaust gas emission standards. The exhaust gas in the paint spraying room must be reprocessed. Traditional environmental protection process practices usually adopt direct incineration treatment process, which consumes a lot of energy and has unsatisfactory treatment effect. At the same time, the exhaust gas from paint spraying has the characteristics of large air volume and low concentration. In addition, drying after painting will also produce drying exhaust gas, which is a high-concentration exhaust gas. As a result, different exhaust gas treatment equipment needs to be installed for exhaust gases of different concentrations, resulting in increased equipment procurement costs and operating treatment costs. Summary of the invention
[0003] In view of the above problems, the present invention designs an exhaust gas treatment system for the exhaust gas discharged from the automobile painting spray room to concentrate the organic matter in the organic exhaust gas. The concentrated exhaust gas is then incinerated through RTO, and the clean air after combustion is discharged after the waste heat is recovered, so as to achieve the effect of completely treating the exhaust gas. The specific technical scheme is as follows: An automobile painting exhaust gas treatment system, the system comprises a system connected in sequence: The exhaust gas filtration system is installed after the temperature control system of the paint spraying room to filter out impurities and particulate matter in the exhaust gas of the paint spraying room; The zeolite wheel concentration system is equipped with a zeolite wheel adsorption zone and a zeolite wheel desorption zone. The filtered waste gas passes through the zeolite wheel adsorption zone to adsorb organic matter, and then the high-temperature waste gas is desorbed in the zeolite wheel desorption zone using the high-temperature waste heat to form high-concentration waste gas. Waste gas incineration system: The high-concentration waste gas generated by the zeolite rotor concentration system is sent to the waste gas incineration system by the combustion waste gas fan for incineration treatment; the high-temperature waste heat waste gas generated by the waste gas incineration system is sent to the zeolite rotor desorption area after passing through the heat exchange device for rotor desorption; The fan system includes the original exhaust gas exhaust fan installed at the rear end of the zeolite rotor concentration system; the desorption exhaust gas fan installed at the front end of the heat exchange device; and the combustion exhaust gas fan installed at the front end of the exhaust gas incineration system; Connect the air duct system, including all air inlet and exhaust ducts related to the equipment and the ducts between the system equipment, connect the exhaust gas treatment equipment into a complete system, and all pipes are leak-proof; The PLC control system consists of PLC, touch screen and power cabinet, electrical control cabinet, PLC control cabinet, solenoid valve box, on-site operation box and field instruments.
[0004] Furthermore, the exhaust gas filtration system is divided into four stages of filtration, namely, G3G plate filter, G4 bag filter, F7 bag filter and F9 bag filter.
[0005] Furthermore, the zeolite wheel in the zeolite wheel concentration system is divided into three areas, a treatment area, a cooling area and a regeneration area. The zeolite wheel is made of crystalline aluminosilicate minerals, and the zeolite is arranged in a honeycomb shape.
[0006] Furthermore, the waste gas incineration system adopts an RTO three-chamber incinerator, and the temperature in the furnace is between 760°C and 860°C.
[0007] Furthermore, the waste heat exhaust gas after incineration is provided through a heat exchange device to provide a desorption heat source for the zeolite wheel, and at the same time, another set of heat exchange devices is used to provide a heat source for the heating equipment of the coating station.
[0008] When the present invention is used, the exhaust gas from the varnish solvent-based paint spray room and the solvent-based paint mixing room is collected through the air duct and then preliminarily filtered through the filtration system before being discharged to the zeolite rotor. Adsorption fans are set at the rear ends of the two zeolite rotors to pass the exhaust gas before the zeolite rotor through the zeolite molecular sieve in the adsorption zone of the zeolite rotor. The zeolite molecular sieve will adsorb VOCs in the exhaust gas. The air adsorbed by the zeolite molecular sieve becomes clean air and is discharged into the smoke stream through the air duct and then discharged into the atmosphere from the chimney. In addition, the RTO three-chamber incinerator is used to incinerate and crack the high-concentration exhaust gas desorbed from the zeolite rotor and the high-temperature exhaust gas generated by the primer drying room, the glue drying room and the topcoat drying room at high temperature.
[0009] The main material of the zeolite rotor is crystalline aluminosilicate minerals, which have the ability to adsorb VOCs. At the same time, the zeolite is set in a honeycomb shape, which has the characteristics of high strength, high rigidity and light weight, and has higher adsorption efficiency. When the exhaust gas passes through the zeolite rotor treatment area, the zeolite rotor can adsorb the VOC waste gas molecules in the exhaust gas. The concentration of the VOC waste gas after adsorption can be controlled below 15mg / m³, which is far lower than the 30mg / m³ emission standard required by the government; in addition, the high-temperature waste heat exhaust gas of the RTO three-chamber incinerator passes through the heat exchange device to desorb the zeolite rotor in the regeneration area, that is, the high-concentration waste gas molecules adsorbed by the zeolite rotor are reversed at high temperature and then brought into the RTO incinerator through the desorption fan for high-temperature decomposition.
[0010] The RTO three-chamber incinerator can collect the high-concentration waste gas desorbed from the wheel and the waste gas discharged from the drying room in the high-temperature furnace for high-temperature incineration to decompose the VOC waste gas. The temperature in the furnace is between 760℃ and 860℃. The exhaust temperature after incineration is still 400℃-500℃. This waste heat waste gas provides a desorption heat source for the zeolite wheel through a heat exchange device, and at the same time provides a heat source for the coating station heating equipment through another set of heat exchange devices, so as to achieve the utilization of energy waste heat, reduce production and operation costs and reduce carbon emissions.
[0011] The present invention has the advantages of simple process, low investment and operation cost, convenient operation and management, and can be widely used in spraying processes in industries such as automobile manufacturing, parts manufacturing, and furniture manufacturing. After the exhaust gas in the paint spraying room of the painting workshop is treated by this scheme, the equipment runs stably and reliably, greatly reducing the total amount of VOC emissions, and has significant social benefits. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 Schematic diagram of the structure of the present invention. DETAILED DESCRIPTION
[0013] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0014] like Figure 1 As shown, an automobile painting exhaust gas treatment system includes the following systems connected in sequence: The exhaust gas filtration system is installed after the temperature control system of the paint spraying room to filter out impurities and particulate matter in the exhaust gas of the paint spraying room; The zeolite wheel concentration system is equipped with a zeolite wheel adsorption zone and a zeolite wheel desorption zone. The filtered waste gas passes through the zeolite wheel adsorption zone to adsorb organic matter, and then the high-temperature waste gas is desorbed in the zeolite wheel desorption zone using the high-temperature waste heat to form high-concentration waste gas. Waste gas incineration system: The high-concentration waste gas generated by the zeolite rotor concentration system is sent to the waste gas incineration system by the combustion waste gas fan for incineration treatment; the high-temperature waste heat waste gas generated by the waste gas incineration system is sent to the zeolite rotor desorption area after passing through the heat exchange device for rotor desorption; The fan system includes the original exhaust gas exhaust fan installed at the rear end of the zeolite rotor concentration system; the desorption exhaust gas fan installed at the front end of the heat exchange device; and the combustion exhaust gas fan installed at the front end of the exhaust gas incineration system; Connect the air duct system, including all air inlet and exhaust ducts related to the equipment and the ducts between the system equipment, connect the exhaust gas treatment equipment into a complete system, and all pipes are leak-proof; The PLC control system consists of PLC, touch screen and power cabinet, electrical control cabinet, PLC control cabinet, solenoid valve box, on-site operation box and field instruments.
[0015] The exhaust gas filtration system is divided into four stages of filtration, namely, G3G plate filter, G4 bag filter, F7 bag filter and F9 bag filter.
[0016] The zeolite wheel in the zeolite wheel concentration system is divided into three areas: treatment area, cooling area and regeneration area. The zeolite wheel is made of crystalline aluminosilicate minerals, and the zeolite is arranged in a honeycomb shape.
[0017] The waste gas incineration system adopts an RTO three-chamber incinerator, and the temperature in the furnace is between 760℃ and 860℃.
[0018] The waste heat after incineration is passed through a heat exchange device to provide a desorption heat source for the zeolite wheel, and at the same time, another set of heat exchange devices is used to provide a heat source for the heating equipment in the painting station.
[0019] The exhaust gas from the varnish solvent-based paint spray room and the solvent-based paint mixing room is collected through the air duct and then filtered through the filtration system for preliminary filtration before being discharged to the zeolite rotor. Adsorption fans are set at the rear ends of the two zeolite rotors to pass the exhaust gas before the zeolite rotor through the zeolite molecular sieve in the adsorption zone of the zeolite rotor. The zeolite molecular sieve will adsorb VOCs in the exhaust gas. The air adsorbed by the zeolite molecular sieve becomes clean air and is discharged into the smoke stream through the air duct and then discharged into the atmosphere from the chimney. In addition, the RTO three-chamber incinerator is used to incinerate and crack the high-concentration exhaust gas desorbed from the zeolite rotor and the high-temperature exhaust gas generated by the primer drying room, glue drying room and topcoat drying room at high temperature.
[0020] The main material of the zeolite rotor is crystalline aluminosilicate minerals, which have the ability to adsorb VOCs. At the same time, the zeolite is set in a honeycomb shape, which has the characteristics of high strength, high rigidity and light weight, and has higher adsorption efficiency. When the exhaust gas passes through the zeolite rotor treatment area, the zeolite rotor can adsorb the VOC waste gas molecules in the exhaust gas. The concentration of the VOC waste gas after adsorption can be controlled below 15mg / m³, which is far lower than the 30mg / m³ emission standard required by the government; in addition, the high-temperature waste heat exhaust gas of the RTO three-chamber incinerator passes through the heat exchange device to desorb the zeolite rotor in the regeneration area, that is, the high-concentration waste gas molecules adsorbed by the zeolite rotor are reversed at high temperature and then brought into the RTO incinerator through the desorption fan for high-temperature decomposition.
[0021] The RTO three-chamber incinerator can collect the high-concentration waste gas desorbed from the wheel and the waste gas discharged from the drying room in the high-temperature furnace for high-temperature incineration to decompose the VOC waste gas. The temperature in the furnace is between 760℃ and 860℃. The exhaust temperature after incineration is still 400℃-500℃. This waste heat waste gas provides a desorption heat source for the zeolite wheel through a heat exchange device, and at the same time provides a heat source for the coating station heating equipment through another set of heat exchange devices, so as to achieve the utilization of energy waste heat, reduce production and operation costs and reduce carbon emissions.
[0022] After the exhaust gas concentration zeolite rotary incineration system of the present invention is installed, when the paint shop is in full production, all the exhaust gases in the paint shop are mixed and measured by a third-party authoritative testing agency. The main pollutants in the exhaust gas are relatively small, far below the government's environmental protection requirements. The installation and commissioning of the automobile paint shop exhaust gas treatment system is completed within the specified time, so that the exhaust gas emission indicators of the paint shop are fully in line with the government's indicators, and the exhaust gas emissions reach an excellent level, providing a favorable guarantee for the company's clean production work.
[0023] The above describes in detail the preferred implementation of this patent, but this patent is not limited to the above implementation. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of this patent.
Claims
1. An automobile painting exhaust gas treatment system, characterized in that: The system consists of the following systems connected in sequence: The exhaust gas filtration system is installed after the temperature control system of the paint spraying room to filter out impurities and particulate matter in the exhaust gas of the paint spraying room; The zeolite wheel concentration system is equipped with a zeolite wheel adsorption zone and a zeolite wheel desorption zone. The filtered waste gas passes through the zeolite wheel adsorption zone to adsorb organic matter, and then the high-temperature waste gas is desorbed in the zeolite wheel desorption zone using the high-temperature waste heat to form high-concentration waste gas. Waste gas incineration system: The high-concentration waste gas generated by the zeolite rotor concentration system is sent to the waste gas incineration system by the combustion waste gas fan for incineration treatment; the high-temperature waste heat waste gas generated by the waste gas incineration system is sent to the zeolite rotor desorption area after passing through the heat exchange device for rotor desorption; The fan system includes the original exhaust gas exhaust fan installed at the rear end of the zeolite rotor concentration system; the desorption exhaust gas fan installed at the front end of the heat exchange device; and the combustion exhaust gas fan installed at the front end of the exhaust gas incineration system; The air duct system includes all air inlet and exhaust ducts related to the equipment and the ducts between the system equipment, connecting the exhaust gas treatment equipment into a complete system, and all pipes are leak-proof; The PLC control system consists of PLC, touch screen and power cabinet, electrical control cabinet, PLC control cabinet, solenoid valve box, on-site operation box and field instruments.
2. The automobile painting exhaust gas treatment system according to claim 1, characterized in that: The exhaust gas filtration system is divided into four stages of filtration, namely, G3G plate filter, G4 bag filter, F7 bag filter and F9 bag filter.
3. The automobile painting exhaust gas treatment system according to claim 1, characterized in that: The zeolite wheel in the zeolite wheel concentration system is divided into three areas: treatment area, cooling area and regeneration area. The zeolite wheel is made of crystalline aluminosilicate minerals, and the zeolite is arranged in a honeycomb shape.
4. The automobile painting exhaust gas treatment system according to claim 1, characterized in that: The waste gas incineration system adopts an RTO three-chamber incinerator, and the temperature in the furnace is between 760℃ and 860℃.
5. The automobile painting exhaust gas treatment system according to claim 1, characterized in that: The waste heat after incineration is passed through a heat exchange device to provide a desorption heat source for the zeolite wheel, and at the same time, another set of heat exchange devices is used to provide a heat source for the heating equipment in the painting station.