Environment-friendly energy-saving system

Abstract

The utility model belongs to the technical field of plate and strip finishing and processing equipment, and particularly provides an environment-friendly energy-saving system which comprises a curing oven, a surface coating chamber, a chemical coating drying oven, a cleaning and drying device, a plurality of first air mixing and supplying units, a plurality of second air mixing and supplying units, a plurality of third air mixing and supplying units, a cracking incinerator, a waste gas heat exchanger, a fresh air heat exchanger, a water-gas heat exchanger and a chimney. The problems that an existing coating line production process is large in energy consumption and low in utilization rate, and waste gas exhausted by a coating unit and a color coating unit production process pollutes the environment and harms human health are solved. Pollution of production line emission to the atmospheric environment is avoided, meanwhile, the body health of operators is protected, green and environment-friendly benign development is achieved, consumption of natural gas is reduced, the energy requirements of coating line chemical coating drying, cleaning drying and cleaning circulation are met, and energy is saved.

Description

Technical Field

[0001] This utility model belongs to the technical field of strip finishing and processing equipment, and specifically relates to an environmentally friendly and energy-saving system. Background Technology

[0002] High-quality development is the primary task in building a modern socialist country in all respects. With my country's rapid economic growth, the technology of strip finishing and processing equipment, especially coating units and color coating units, has experienced rapid development. Current production processes involve applying coatings to the strip and then drying it to cure the paint. During this process, a large amount of organic solvent gases are released, and organic solvent gases are also released from the topcoat chamber as production continues. These organic solvent gases are not only harmful to human health but also pollute the atmospheric environment.

[0003] The production processes of coating and color coating units require energy at multiple process points, including the cleaning section circulation tank, cleaning and drying equipment, chemical coating drying oven, and curing oven. In actual production, the heating method for the cleaning section circulation tank can be electric or steam heating; the heating method for the cleaning and drying equipment can also be electric or steam heating; the heating method for the chemical coating drying oven and curing oven often uses hot air, electric heating, or a combination of both. Regardless of whether steam heating or electric heating is used, boilers and related electric heating equipment are required, which increases investment and operating costs. Considering that the organic solvent gases emitted by the unit are flammable, high-calorific-value gases, treating them by absorption or adsorption would result in energy waste. Therefore, for the entire unit, it is imperative to meet the temperature requirements of the process points to satisfy production needs while also meeting environmental protection and energy-saving requirements, which can also improve the company's competitiveness. Utility Model Content

[0004] The present invention provides an environmentally friendly and energy-saving system, the purpose of which is to overcome the problems of high energy consumption and low utilization rate in the existing coating line production process, as well as the pollution of the environment and harm to human health caused by the exhaust gas emitted by the coating unit and color coating unit production process.

[0005] Therefore, this utility model provides an environmentally friendly and energy-saving system, including a curing oven, a topcoat chamber, a chemical coating drying oven, a cleaning and drying device, multiple air mixing and supply units (unit 1, unit 2, unit 3), a pyrolysis incinerator, a waste gas heat exchanger, a fresh air heat exchanger, a water-gas heat exchanger, and a chimney. The exhaust gas outlet of the curing oven's hood, the exhaust gas outlets of the multiple curing ovens' temperature zones, and the exhaust gas outlet of the topcoat chamber are all connected to the exhaust gas inlet of the waste gas heat exchanger. The preheating outlet of the waste gas heat exchanger is connected to the inlet of the pyrolysis incinerator, and the outlet of the pyrolysis incinerator is connected to... The hot air inlet of the exhaust gas heat exchanger is connected to the hot air outlet of the exhaust gas heat exchanger, which is connected to the inlet of multiple air mixing and supply units and the hot air inlet of the fresh air heat exchanger. The outlet of air mixing and supply unit one is connected to the temperature zone inlet of the curing oven. The outlet of the fresh air heat exchanger is connected to the inlet of the topcoat chamber, the inlet of air mixing and supply unit two, the inlet of air mixing and supply unit three, and the inlet of the water-air heat exchanger. The outlet of air mixing and supply unit two is connected to the inlet of the chemical coating drying oven. The outlet of air mixing and supply unit three is connected to the inlet of the cleaning and drying device. The outlet of the water-air heat exchanger is connected to the chimney.

[0006] Preferably, the outlet of the curing oven is connected to an air knife device.

[0007] Preferably, the air mixing and supply unit includes an air mixing box and a circulating fan. The air mixing box is connected to the outlet of the curing oven temperature zone, the hot gas outlet of the waste gas heat exchanger, and the inlet of the circulating fan. The outlet of the circulating fan is connected to the inlet of the curing oven temperature zone.

[0008] Preferably, the second air mixing and supply unit includes a chemical coating circulating fan and a chemical coating mixing box. The chemical coating mixing box is connected to the outlet of the fresh air heat exchanger, the inlet of the chemical coating circulating fan, and the outlet of the chemical coating drying oven. The outlet of the chemical coating circulating fan is connected to the inlet of the chemical coating drying oven.

[0009] Preferably, the air mixing and supply unit three includes a drying fan and a drying mixing box, the drying mixing box being connected to the inlet of the drying fan and the outlet of the fresh air heat exchanger, and the outlet of the drying fan being connected to the inlet of the cleaning and drying device.

[0010] Preferably, an exhaust fan for curing oven outlet is provided between the exhaust port of the curing oven hood and the exhaust port of the exhaust heat exchanger.

[0011] Preferably, an exhaust fan is provided between the exhaust gas outlets of the multiple curing ovens and the exhaust gas inlet of the exhaust gas heat exchanger. The exhaust gas outlets of the multiple curing ovens are all connected to the inlet of the exhaust fan, and the outlet of the exhaust fan is connected to the exhaust gas inlet of the exhaust gas heat exchanger.

[0012] Preferably, the outlet of the waste gas heat exchanger is equipped with a curing oven hot air fan, the outlet of the waste gas heat exchanger is connected to the inlet of the curing oven hot air fan, and the outlet of the curing oven hot air fan is connected to multiple mixing boxes.

[0013] Preferably, the environmentally friendly and energy-saving system further includes multiple washing liquid units, a water-air heat exchanger connecting the multiple washing liquid units, an inlet of the washing liquid unit connecting to the outlet of the water-air heat exchanger, and an outlet of the washing liquid unit connecting to the inlet of the water-air heat exchanger.

[0014] Preferably, the cold air inlet of the fresh air heat exchanger is connected to a fresh air fan.

[0015] The beneficial effects of this utility model are:

[0016] 1. The environmentally friendly and energy-saving system provided by this utility model preheats the exhaust gases from the curing oven hood and temperature zone, as well as the exhaust gases from the topcoat chamber, before they enter the pyrolysis incinerator for combustion. This ensures the complete combustion of organic solvent gases generated during the coating line, preventing atmospheric pollution from production line emissions and protecting the health of operators, thus achieving green and environmentally friendly development. Preheating the organic solvent gases through the exhaust gas heat exchanger reduces natural gas consumption. Furthermore, by incorporating a fresh air heat exchanger and a water-gas heat exchanger into the environmentally friendly and energy-saving system, the energy from the combustion of organic solvent gases is fully utilized, meeting the energy requirements of coating drying, cleaning drying, and cleaning cycle in the coating line, thereby achieving energy savings. This utility model is highly practical, simple in structure, and easy to implement.

[0017] 2. The environmentally friendly and energy-saving system provided by this utility model includes a mixing box and a circulating fan. The mixing box can easily contain the gas at the target temperature, and the circulating fan can easily send the gas in the mixing box into the curing oven for drying. The system has a simple structure and a high degree of automation. Attached Figure Description

[0018] The present invention will be further described in detail below with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the structure of an environmentally friendly and energy-saving system;

[0020] Figure 2 This is a schematic diagram of the structure of the water-air heat exchanger and the washing liquid unit.

[0021] Explanation of reference numerals in the attached drawings: 1. Air knife device; 2. Air knife fan; 3. Exhaust fan at the outlet of the curing oven; 4. Curing oven; 5. Mixing box four; 6. Circulating fan four; 7. Mixing box three; 8. Circulating fan three; 9. Circulating fan two; 10. Mixing box two; 11. Circulating fan one; 12. Mixing box one; 13. Topcoat chamber; 14. Topcoat chamber exhaust fan; 15. Topcoat chamber supply fan; 16. Chemical coating drying oven; 17. Chemical coating circulation... 18. Blower; 19. Coating mixing air box; 20. Coating exhaust fan; 21. Drying fan; 22. Drying mixing air box; 23. Cleaning and drying device; 24. Pyrolysis incinerator; 25. Waste gas heat exchanger; 26. Waste gas fan; 27. Curing oven hot air fan; 28. Fresh air heat exchanger; 29. ​​Fresh air fan; 29. ​​Water-gas heat exchanger; 29.1. Alkali washing tank one; 29.1-1. Alkali washing circulating pump one; 29.1-2. Alkali washing valve one; 29.2 Alkaline Washing Tank II; 29.2-1 Alkaline Washing Circulation Pump II; 29.2-2 Alkaline Washing Valve II; 29.3 Alkaline Washing Tank III; 29.3-1 Alkaline Washing Circulation Pump III; 29.3-2 Alkaline Washing Valve III; 29.4 Water Washing Tank I; 29.4-1 Water Washing Circulation Pump I; 29.4-2 Water Washing Valve I; 29.5 Acid Washing Tank; 29.5-1 Acid Washing Circulation Pump; 2 9.5-2, Pickling valve; 29.6, Washing tank 2; 29.6-1, Washing circulation pump 2; 29.6-2, Washing valve 2; 29.7, Washing tank 3; 29.7-1, Washing circulation pump 3; 29.7-2, Washing valve 3; 29.8, Washing tank 4; 29.8-1, Washing circulation pump 4; 29.8-2, Washing valve 4; 30, Exhaust fan; 31, Chimney. Detailed Implementation

[0022] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0023] Example 1:

[0024] like Figure 1As shown, an environmentally friendly and energy-saving system includes a curing oven 4, a topcoat chamber 13, a chemical coating drying oven 16, a cleaning and drying device 22, multiple air mixing and supply units (unit 1, unit 2, and unit 3), a pyrolysis incinerator 23, a waste gas heat exchanger 24, a fresh air heat exchanger 27, a water-gas heat exchanger 29, and a chimney 31. The exhaust hood of the curing oven 4, the exhaust hoods of the multiple curing ovens 4 in their temperature zones, and the exhaust hood of the topcoat chamber 13 are all connected to the exhaust inlet of the waste gas heat exchanger 24. The preheating outlet of the waste gas heat exchanger 24 is connected to the inlet of the pyrolysis incinerator 23, and the outlet of the pyrolysis incinerator 23 is connected to... The hot air inlet of the exhaust gas heat exchanger 24 is connected to the inlet of multiple air mixing and supply units 1 and the hot air inlet of the fresh air heat exchanger 27. The outlet of the air mixing and supply unit 1 is connected to the temperature zone inlet of the curing oven 4. The outlet of the fresh air heat exchanger 27 is connected to the inlet of the topcoat chamber 13, the inlet of the air mixing and supply unit 2, the inlet of the air mixing and supply unit 3 and the inlet of the water-air heat exchanger 29. The outlet of the air mixing and supply unit 2 is connected to the inlet of the chemical coating drying oven 16. The outlet of the air mixing and supply unit 3 is connected to the inlet of the cleaning and drying device 22. The outlet of the water-air heat exchanger 29 is connected to the chimney 31.

[0025] This invention preheats the exhaust gases from the curing oven 4's fume hood and temperature zone, as well as the exhaust gases from the topcoat chamber 13, via an exhaust gas heat exchanger 24 before entering the pyrolysis incinerator 23 for combustion. This ensures complete combustion of the organic solvent gases generated during the coating line, preventing atmospheric pollution from production line emissions and protecting the health of operators, thus achieving green and environmentally friendly development. Preheating the organic solvent gases via the exhaust gas heat exchanger 24 reduces natural gas consumption. Furthermore, by incorporating a fresh air heat exchanger 27 and a water-gas heat exchanger 29 into the energy-saving and environmentally friendly system, the energy from the combustion of the organic solvent gases is fully utilized, meeting the energy requirements of the coating line's curing, drying, cleaning, and recycling processes, thereby achieving energy savings. This invention is highly practical, simple in structure, and easy to implement.

[0026] In practical applications, although organic solvent gases pollute the environment and are harmful to human health, they are high-heat combustible gases. Under suitable conditions, they can generate clean, high-temperature flue gas after combustion. The heat energy is greatly wasted if not used. This invention uses natural gas as fuel and the organic solvent gas is completely combusted in the pyrolysis incinerator 23 at a furnace temperature of 760℃ and a residence time in the furnace of more than 1.2s. The heat energy of the high-temperature clean flue gas after combustion is used to meet the heating requirements of other process points in the coating line. This removes harmful substances, meets environmental protection requirements, saves energy, and achieves a virtuous cycle of environmental protection and energy conservation.

[0027] Example 2:

[0028] Based on Example 1, the outlet of the curing oven 4 is connected to an air knife device 1.

[0029] Specifically, the air knife device 1 is located at the outlet of the curing oven 4, and its main function is to prevent the exhaust gas carried out by the strip from polluting the environment.

[0030] Preferably, an air knife fan 2 is connected between the outlet of the curing oven 4 and the air knife device 1.

[0031] Specifically, the air knife fan 2 facilitates the delivery of exhaust gas from the curing oven 4 to the air knife device 1, which has a simple structure and a high degree of automation.

[0032] Preferably, the air mixing and supply unit includes an air mixing box and a circulating fan. The air mixing box is connected to the outlet of the curing oven 4 temperature zone, the hot gas outlet of the waste gas heat exchanger 24 and the inlet of the circulating fan. The outlet of the circulating fan is connected to the inlet of the curing oven 4 temperature zone.

[0033] Specifically, the mixing box 1 is convenient to contain the target high-temperature gas from the exhaust gas heat exchanger 24, and the circulating fan 1 is convenient to send the gas in the mixing box 1 into the curing oven 4 for drying. The structure is simple and the degree of automation is high.

[0034] Preferably, the curing oven 4 is provided with 4 temperature zones, and each temperature zone is connected to a mixing and air supply unit 1.

[0035] Specifically, hot air is supplied to the connected temperature zone through the air mixing and supply unit, which facilitates precise control for drying.

[0036] Preferably, the outlet of the waste gas heat exchanger 24 is provided with a curing oven hot air fan 26, the outlet of the waste gas heat exchanger 24 is connected to the inlet of the curing oven hot air fan 26, and the outlet of the curing oven hot air fan 26 is connected to multiple mixing boxes.

[0037] Specifically, the main function of curing oven 4 is to dry the coated strips and plates, thus curing the coating. Mixing box 4 5 is located in the fourth temperature zone of curing oven 4. Mixing box 4 5 is connected to curing oven 4, circulating fan 4 6, and curing oven hot air fan 26 via pipes. Circulating fan 4 6 delivers hot air from mixing box 4 5 to the fourth temperature zone of curing oven 4 to dry the strips and plates. Mixing box 3 7 is located in the third temperature zone of curing oven 4. Mixing box 3 7 is connected to curing oven 4, circulating fan 3 8, and curing oven hot air fan 26 via pipes. Circulating fan 3 8 delivers hot air from mixing box 3 7 to curing oven 4. The third temperature zone dries the strip; the second mixing box 10 is arranged in the second temperature zone of the curing oven 4. The second mixing box 10 is connected to the curing oven 4, the second circulating fan 9, and the curing oven hot air fan 26 through pipes. The second circulating fan 9 sends the hot air from the second mixing box 10 to the second temperature zone of the curing oven 4 to dry the strip; the first mixing box 12 is arranged in the first temperature zone of the curing oven 4. The first mixing box 12 is connected to the curing oven 4, the first circulating fan 11, and the curing oven hot air fan 26 through pipes. The first circulating fan 11 sends the hot air from the first mixing box 12 to the first temperature zone of the curing oven 4 to dry the strip.

[0038] Preferably, a curing oven outlet exhaust fan 3 is provided between the exhaust port of the curing oven 4 and the exhaust inlet of the exhaust heat exchanger 24.

[0039] Specifically, the exhaust fan 3 at the outlet of the curing oven facilitates the preheating of the organic solvent gas accumulated in the fume hood of the curing oven 4 into the exhaust heat exchanger 24.

[0040] Preferably, an exhaust fan 25 is provided between the exhaust gas outlets of the multiple curing ovens 4 and the exhaust gas inlet of the exhaust gas heat exchanger 24. The exhaust gas outlets of the multiple curing ovens 4 are all connected to the inlet of the exhaust fan 25, and the outlet of the exhaust fan 25 is connected to the exhaust gas inlet of the exhaust gas heat exchanger 24.

[0041] Specifically, the exhaust gas from the temperature zones of multiple curing ovens 4 is easily sent to the exhaust gas heat exchanger 24 via the exhaust gas fan 25.

[0042] Preferably, each temperature zone of the curing oven 4 is equipped with an explosion-proof hole, an oven temperature detection device, an oven pressure detection device, and a concentration detection device, and the oven opening is designed with an adjustable baffle.

[0043] Specifically, the pyrolysis incinerator 23 has one explosion-proof hole, two temperature measuring elements, and one pressure measuring element, which serve as safety protection and closed-loop control of furnace temperature, ultimately enabling the complete pyrolysis of organic solvent gas to meet emission standards. In practical applications, the explosion-proof hole is used to release deflagration pressure; the temperature measuring element and the pressure measuring element are used to measure the furnace temperature and pressure, control the preheating degree of organic solvent gas, ensure furnace temperature and transportation safety, control the combustion efficiency of organic solvent gas, and ensure the stable operation of the pyrolysis incinerator 23.

[0044] Each temperature zone is equipped with temperature measuring components. The opening of the hot air valve of the electric actuator in the hot air pipeline of the mixing chamber is adjusted by the control system to realize the automatic control of the temperature zone 4 of the curing oven. An organic solvent gas concentration detection device is installed between the first two temperature zones of the curing oven 4, and a furnace pressure detection device is installed at the tail of the furnace body to eliminate safety hazards.

[0045] In practical applications, the exhaust and supply air volumes of the exhaust fan 25 and the curing oven hot air fan 26 are adjusted. The temperature measured by the temperature measuring components is compared with the set temperature. The control system uses a PID algorithm to control and adjust the opening of the electric valve by the electric actuator, thereby achieving closed-loop control of the curing oven temperature in four zones. Ultimately, under stable operation, the temperature control accuracy of the four zones of the curing oven is ±2℃, resulting in the production of qualified products.

[0046] Preferably, the exhaust gas heat exchanger 24 is a tubular heat exchanger.

[0047] Specifically, the exhaust gas heat exchanger 24 preheats the organic solvent gases from the curing oven outlet, the curing oven, and the topcoat chamber to 400°C, achieving energy savings. In practical applications, the exhaust fan 3 at the curing oven outlet, the exhaust gas fan 25, and the topcoat chamber exhaust fan 14 respectively send the organic solvent gases from the curing oven outlet, the curing oven 4, and the topcoat chamber 13 into the exhaust gas heat exchanger 24 for heat exchange, achieving preheating of the organic solvents and gases, which are then burned in the pyrolysis incinerator 23, saving natural gas and achieving energy savings.

[0048] Example 3:

[0049] Based on Example 2, the second air mixing and supply unit includes a chemical coating circulating fan 17 and a chemical coating mixing box 18. The chemical coating mixing box 18 is connected to the outlet of the fresh air heat exchanger 27, the inlet of the chemical coating circulating fan 17 and the outlet of the chemical coating drying oven 16, respectively. The outlet of the chemical coating circulating fan 17 is connected to the inlet of the chemical coating drying oven 16.

[0050] Specifically, the chemical coating mixing air box 18 is convenient for containing the target high-temperature gas that has been heat exchanged from the fresh air heat exchanger 27, and the chemical coating circulating fan 17 is convenient for sending the gas in the chemical coating mixing air box 18 into the chemical coating drying oven 16 for drying. The structure is simple and the degree of automation is high.

[0051] Preferably, the fresh air heat exchanger 27 is a tubular heat exchanger.

[0052] Specifically, fresh cold air becomes hot air after passing through the fresh air heat exchanger 27. The hot air, heated to 250-300℃, is used as the heat source for the topcoat chamber 13, the chemical coating drying oven 16, and the cleaning and drying device 22 to meet process requirements. The chemical coating circulating fan 17 sends the hot air from the chemical coating mixing box 18 to the chemical coating drying oven 16 to dry the strip coated with chemical coating liquid. During this process, the chemical coating drying oven 16 is equipped with temperature detection components. The temperature of the chemical coating drying oven 16 is automatically controlled by adjusting the opening of the hot air valve of the electric actuator in the hot air pipeline through the control system.

[0053] Preferably, a chemical coating exhaust fan 19 is connected to the pipeline connecting the chemical coating mixing air box 18 and the chemical coating drying oven 16.

[0054] Specifically, the function of the chemical coating drying oven 16 is to dry the passivation liquid and to discharge excess flue gas from the pipeline through the chemical coating exhaust fan 19.

[0055] Example 4:

[0056] Based on embodiment 3, the air mixing and supply unit 3 includes a drying fan 20 and a drying mixing box 21. The drying mixing box 21 is connected to the inlet of the drying fan 20 and the outlet of the fresh air heat exchanger 27, respectively. The outlet of the drying fan 20 is connected to the inlet of the cleaning and drying device 22.

[0057] Specifically, the drying fan 20 sends the hot air from the drying mixing box 21 to the cleaning and drying device 22 to dry the cleaned strip, remove water droplets or water film from the surface of the strip, meet the process production requirements, and further achieve energy saving.

[0058] Preferably, the cold air inlet of the fresh air heat exchanger 27 is connected to a fresh air fan 28.

[0059] Specifically, in practical applications, the fresh air fan 28 sends the filtered cold air into the fresh air heat exchanger 27 for heat exchange, and the high-temperature hot air coming out of the heat exchanger is sent to the top coating chamber 13, the chemical coating mixing box 18 and the drying mixing box 21.

[0060] Example 5:

[0061] Based on Example 4, such as Figure 2 As shown, the environmentally friendly and energy-saving system also includes multiple washing liquid units. The water-air heat exchanger 29 is connected to the multiple washing liquid units. The inlet of the washing liquid unit is connected to the outlet of the water-air heat exchanger 29, and the outlet of the washing liquid unit is connected to the inlet of the water-air heat exchanger 29.

[0062] Specifically, there are 8 washing solution units: alkaline washing unit 1, alkaline washing unit 2, alkaline washing unit 3, water washing unit 1, acid washing unit 1, water washing unit 2, water washing unit 3, and water washing unit 4.

[0063] The alkaline washing unit includes an alkaline washing tank 29.1, an alkaline washing circulation pump 29.1-1, and two alkaline washing valves 29.1-2.

[0064] Alkaline washing tank 29.1 is connected to one end of alkaline washing valve 29.1-2 via a pipe. The other end of alkaline washing valve 29.1-2 is connected to one end of alkaline washing circulating pump 29.1-1. The other end of alkaline washing circulating pump 29.1-1 is connected to one end of second alkaline washing valve 29.1-2. The other end of second alkaline washing valve 29.1-2 is connected to the inlet of water-air heat exchanger 29. The outlet of water-air heat exchanger 29 is connected to alkaline washing tank 29.1 to form a closed loop, thereby heating the alkaline washing liquid in alkaline washing tank 29.1.

[0065] The second alkaline washing unit includes an alkaline washing tank 29.2, an alkaline washing circulation pump 29.2-1, and two alkaline washing valves 29.2-2.

[0066] Alkaline washing tank 29.2 is connected to one end of alkaline washing valve 29.2-2 via a pipe. The other end of alkaline washing valve 29.2-2 is connected to one end of alkaline washing circulation pump 29.2-1. The other end of alkaline washing circulation pump 29.2-1 is connected to one end of a second alkaline washing valve 29.2-2. The other end of the second alkaline washing valve 29.2-2 is connected to the inlet of water-air heat exchanger 29. The outlet of water-air heat exchanger 29 is connected to alkaline washing tank 29.2 to form a closed loop, thereby heating the alkaline washing liquid in alkaline washing tank 29.2.

[0067] The alkaline washing unit 3 includes an alkaline washing tank 3 29.3, an alkaline washing circulation pump 3 29.3-1, and two alkaline washing valves 3 29.3-2;

[0068] Alkaline washing tank 3 29.3 is connected to one end of alkaline washing valve 3 29.3-2 via a pipe. The other end of alkaline washing valve 3 29.3-2 is connected to one end of alkaline washing circulating pump 3 29.3-1. The other end of alkaline washing circulating pump 3 29.3-1 is connected to one end of a second alkaline washing valve 3 29.3-2. The other end of the second alkaline washing valve 3 29.3-2 is connected to the inlet of water-air heat exchanger 29. The outlet of water-air heat exchanger 29 is connected to alkaline washing tank 3 29.3 to form a closed loop, thereby heating the alkaline washing liquid in alkaline washing tank 3 29.3.

[0069] The washing unit includes a washing tank 29.4, a washing circulation pump 29.4-1, and two washing valves 29.4-2.

[0070] The washing tank 29.4 is connected to one end of the washing valve 29.4-2 via a pipe. The other end of the washing valve 29.4-2 is connected to one end of the washing circulation pump 29.4-1. The other end of the washing circulation pump 29.4-1 is connected to one end of the second washing valve 29.4-2. The other end of the second washing valve 29.4-2 is connected to the inlet of the water-air heat exchanger 29. The outlet of the water-air heat exchanger 29 is connected to the washing tank 29.4 to form a closed loop, thereby heating the washing liquid in the washing tank 29.4.

[0071] The pickling unit includes a pickling tank 29.5, a pickling circulation pump 29.5-1, and two pickling valves 29.5-2;

[0072] Pickling tank 29.5 is connected to one end of pickling valve 29.5-2 via a pipe. The other end of pickling valve 29.5-2 is connected to one end of pickling circulation pump 29.5-1. The other end of pickling circulation pump 29.5-1 is connected to one end of second pickling valve 29.5-2. The other end of second pickling valve 29.5-2 is connected to the inlet of water-air heat exchanger 29. The outlet of water-air heat exchanger 29 is connected to pickling tank 29.5 to form a closed loop, thereby heating the pickling solution in pickling tank 29.5.

[0073] The second water washing unit includes a second water washing tank 29.6, a second water washing circulation pump 29.6-1, and two second water washing valves 29.6-2;

[0074] The second washing tank 29.6 is connected to one end of the second washing valve 29.6-2 via a pipe. The other end of the second washing valve 29.6-2 is connected to one end of the second washing circulation pump 29.6-1. The other end of the second washing circulation pump 29.6-1 is connected to one end of the second washing valve 29.6-2. The other end of the second washing valve 29.6-2 is connected to the inlet of the water-air heat exchanger 29. The outlet of the water-air heat exchanger 29 is connected to the second washing tank 29.6 to form a closed loop, thereby heating the washing liquid in the second washing tank 29.6.

[0075] The washing unit 3 includes a washing tank 3 29.7, a washing circulation pump 3 29.7-1, and two washing valves 3 29.7-2;

[0076] The washing tank 329.7 is connected to one end of the washing valve 329.7-2 via a pipe. The other end of the washing valve 329.7-2 is connected to one end of the washing circulation pump 329.7-1. The other end of the washing circulation pump 329.7-1 is connected to one end of the second washing valve 329.7-2. The other end of the second washing valve 329.7-2 is connected to the inlet of the water-air heat exchanger 29. The outlet of the water-air heat exchanger 29 is connected to the washing valve 329.7-2 to form a closed loop to heat the washing liquid in the washing tank 329.7.

[0077] The washing unit four includes a washing tank four 29.8, a washing circulation pump four 29.8-1, and two washing valves four 29.8-2;

[0078] The washing tank 429.8 is connected to one end of the washing valve 429.8-2 via a pipe. The other end of the washing valve 429.8-2 is connected to one end of the washing circulation pump 429.8-1. The other end of the washing circulation pump 429.8-1 is connected to one end of the second washing valve 429.8-2. The other end of the second washing valve 429.8-2 is connected to the inlet of the water-air heat exchanger 29. The outlet of the water-air heat exchanger 29 is connected to the washing tank 429.8 to form a closed loop, thereby heating the washing liquid in the washing tank 429.8.

[0079] In practical applications, the water-gas heat exchanger 29 is equipped with 8 sets of heat exchange channels. Each set of heat exchange channels is equipped with a regulating valve to adjust the flow rate of high-temperature gas, thereby adjusting the temperature of the heat exchange liquid. The heat exchange principle is that each set of heat exchange channels is supplied with liquid from the corresponding tank by a circulating pump to the corresponding heat exchange channel of the water-gas heat exchanger 29 for heat exchange, so that the corresponding liquid reaches the process temperature of 50-60℃ for alkaline wash 1, alkaline wash 2, alkaline wash 3 and acid wash, and 50-70℃ for water wash 1, water wash 2, water wash 3 and water wash 4, which meets the production requirements. Among them, the heat exchange pipelines of alkaline wash 1, alkaline wash 2, alkaline wash 3, water wash 1, acid wash, water wash 1, water wash 3 and water wash 4 are all made of stainless steel.

[0080] Preferably, the air inlet pipe of the water-air heat exchanger 29 is provided with a bypass circuit.

[0081] Specifically, appropriate regulating valves are installed on the pipeline. In special circumstances, the bypass circuit can be opened to prevent the liquid temperature from becoming too high.

[0082] Preferably, the water-air heat exchanger 29 adopts a tubular heat exchanger.

[0083] Specifically, the water-air heat exchanger 29 adopts tubular heat exchange and its function is to continuously heat the 8 groups of cleaning fluid in the cleaning section using the principle of heat exchange, so that the cleaning fluid reaches the set temperature range and meets the cleaning requirements.

[0084] Preferably, an exhaust fan 30 is provided between the water-air heat exchanger 29 and the chimney 31.

[0085] Specifically, after heat exchange in the water-gas heat exchanger 29, the clean, high-temperature flue gas reaches the environmentally friendly emission temperature and is discharged by the exhaust fan 30 through the chimney 31, resulting in a high degree of automation.

[0086] Example 6:

[0087] Based on Example 5, a method for an environmentally friendly and energy-saving system includes the following steps: The exhaust gas from the fume hood and temperature zone of the curing oven 4, and the exhaust gas from the topcoat chamber 13, are preheated by the exhaust gas heat exchanger 24 before entering the pyrolysis incinerator 23 for combustion. The hot gas from the pyrolysis incinerator 23 enters the exhaust gas heat exchanger 24 for heat exchange. The hot gas exiting the exhaust gas heat exchanger 24 enters multiple mixing and air supply units and is mixed to the target temperature before entering the temperature zone of the curing oven 4 to dry the coated strips. The hot gas exiting the exhaust gas heat exchanger 24 also enters another... The hot air enters the fresh air heat exchanger 27 for heat exchange. After heat exchange in the fresh air heat exchanger 27, the hot air enters the top coating chamber 13, the mixing air supply unit 2, the mixing air supply unit 3, and the water-air heat exchanger 29. The hot air mixed to the target temperature by the mixing air supply unit 2 enters the chemical coating drying oven 16. The hot air mixed to the target temperature by the mixing air supply unit 3 enters the cleaning and drying device 22, providing heat for the top coating chamber 13, the chemical coating drying oven 16, the cleaning and drying device 22, and the water-air heat exchanger 29. The gas after heat exchange in the water-air heat exchanger 29 is discharged through the chimney 31.

[0088] This invention preheats the exhaust gases from the curing oven 4's fume hood and temperature zone, as well as the exhaust gases from the topcoat chamber 13, via an exhaust gas heat exchanger 24 before entering the pyrolysis incinerator 23 for combustion. This ensures complete combustion of the organic solvent gases generated during the coating line, preventing atmospheric pollution from production line emissions and protecting the health of operators, thus achieving green and environmentally friendly development. Preheating the organic solvent gases via the exhaust gas heat exchanger 24 reduces natural gas consumption. Furthermore, by incorporating a fresh air heat exchanger 27 and a water-gas heat exchanger 29 into the energy-saving and environmentally friendly system, the energy from the combustion of the organic solvent gases is fully utilized, meeting the energy requirements for coating drying, cleaning drying, and cleaning cycle within the coating line, thus achieving energy savings. It is highly practical and easy to implement.

[0089] In the description of this utility model, it should be understood that if any terms or other indications refer to the orientation or positional relationship shown in the drawings, they are based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are for illustrative purposes only and should not be construed as limiting this utility model.

[0090] The above examples are merely illustrative of this utility model and do not constitute a limitation on the scope of protection of this utility model. All designs that are the same as or similar to this utility model are within the scope of protection of this utility model.

Claims

1. An environmentally friendly and energy-saving system, characterized in that: The system includes a curing oven (4), a topcoat chamber (13), a chemical coating drying oven (16), a cleaning and drying device (22), multiple air mixing and supply units 1, 2, and 3, a pyrolysis incinerator (23), a waste gas heat exchanger (24), a fresh air heat exchanger (27), a water-gas heat exchanger (29), and a chimney (31). The exhaust hood of the curing oven (4), the exhaust hoods of the multiple curing ovens (4) in the temperature zones, and the exhaust hood of the topcoat chamber (13) are all connected to the exhaust inlet of the waste gas heat exchanger (24). The preheating outlet of the waste gas heat exchanger (24) is connected to the inlet of the pyrolysis incinerator (23), and the outlet of the pyrolysis incinerator (23) is connected to... The hot air inlet of the exhaust gas heat exchanger (24) and the hot air outlet of the exhaust gas heat exchanger (24) are respectively connected to the inlet of multiple air mixing and air supply units and the hot air inlet of the fresh air heat exchanger (27). The outlet of air mixing and air supply unit one is connected to the temperature zone inlet of the curing oven (4). The outlet of the fresh air heat exchanger (27) is respectively connected to the inlet of the topcoat chamber (13), the inlet of air mixing and air supply unit two, the inlet of air mixing and air supply unit three and the inlet of the water-air heat exchanger (29). The outlet of air mixing and air supply unit two is connected to the inlet of the chemical coating drying oven (16). The outlet of air mixing and air supply unit three is connected to the inlet of the cleaning and drying device (22). The outlet of the water-air heat exchanger (29) is connected to the chimney (31).

2. The environmentally friendly and energy-saving system as described in claim 1, characterized in that: The outlet of the curing oven (4) is connected to an air knife device (1).

3. The environmentally friendly and energy-saving system as described in claim 1, characterized in that: The air mixing and supply unit includes an air mixing box and a circulating fan. The air mixing box is connected to the outlet of the curing oven (4), the hot gas outlet of the waste gas heat exchanger (24), and the inlet of the circulating fan. The outlet of the circulating fan is connected to the inlet of the curing oven (4).

4. The environmentally friendly and energy-saving system as described in claim 1, characterized in that: The second air mixing and supply unit includes a chemical coating circulating fan (17) and a chemical coating mixing box (18). The chemical coating mixing box (18) is connected to the outlet of the fresh air heat exchanger (27), the inlet of the chemical coating circulating fan (17), and the outlet of the chemical coating drying oven (16). The outlet of the chemical coating circulating fan (17) is connected to the inlet of the chemical coating drying oven (16).

5. The environmentally friendly and energy-saving system as described in claim 1, characterized in that: The air mixing and supply unit includes a drying fan (20) and a drying mixing box (21). The drying mixing box (21) is connected to the inlet of the drying fan (20) and the outlet of the fresh air heat exchanger (27). The outlet of the drying fan (20) is connected to the inlet of the cleaning and drying device (22).

6. The environmentally friendly and energy-saving system as described in claim 1, characterized in that: A curing oven outlet exhaust fan (3) is provided between the exhaust port of the curing oven (4) and the exhaust inlet of the exhaust heat exchanger (24).

7. The environmentally friendly and energy-saving system as described in claim 1, characterized in that: An exhaust fan (25) is provided between the exhaust gas outlet of the multiple curing ovens (4) and the exhaust gas inlet of the exhaust gas heat exchanger (24). The exhaust gas outlet of the multiple curing ovens (4) is connected to the inlet of the exhaust fan (25), and the outlet of the exhaust fan (25) is connected to the exhaust gas inlet of the exhaust gas heat exchanger (24).

8. The environmentally friendly and energy-saving system as described in claim 1, characterized in that: The outlet of the exhaust gas heat exchanger (24) is equipped with a curing oven hot air fan (26). The outlet of the exhaust gas heat exchanger (24) is connected to the inlet of the curing oven hot air fan (26). The outlet of the curing oven hot air fan (26) is connected to multiple mixing boxes.

9. The environmentally friendly and energy-saving system as described in claim 1, characterized in that: The environmentally friendly and energy-saving system also includes multiple washing liquid units. The water-air heat exchanger (29) is connected to the multiple washing liquid units. The inlet of the washing liquid unit is connected to the outlet of the water-air heat exchanger (29), and the outlet of the washing liquid unit is connected to the inlet of the water-air heat exchanger (29).

10. The environmentally friendly and energy-saving system as described in claim 1, characterized in that: The cold air inlet of the fresh air heat exchanger (27) is connected to a fresh air fan (28).

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