Environment-friendly constant-temperature system and method for improving coating yield

Abstract

The invention belongs to the technical field of plate and strip finishing and treatment equipment, and particularly provides an environment-friendly constant-temperature system and method for improving the coating yield. The system comprises a coating chamber, a concentration device, a chimney, a fresh air heat exchanger, a waste gas heat exchanger, an incinerator, a combustion-supporting pipeline and an air supply pipeline; the problems that in the prior art, a coating solvent volatilized in a coating chamber is directly sent to corresponding equipment to be burnt, due to the fact that the concentration of the coating solvent sent to be burnt is low, burning can consume a large amount of fuel, energy is consumed greatly, and the temperature change of the coating chamber greatly influences the product quality are solved. The concentration of a coating solvent sent to an incinerator is increased through concentration, consumption of fuel gas is reduced, constant temperature of the coating chamber is guaranteed by controlling air outlet and air supply flow balance of the coating chamber, stable coating performance is guaranteed, and the yield is increased.

Description

Technical Field

[0001] The invention belongs to the technical field of plate and strip finishing and processing equipment, and specifically relates to an environmentally friendly constant temperature system and method for improving coating yield. Background Art

[0002] In the technical field of plate and strip finishing and processing equipment, especially the plate and strip coating unit, the coating and coating room are the core process points and process sites of the coating unit, which are related to the yield and quality of the coated products; when the coating is applied in the coating room, the coating solvent will be volatilized, and the coating solvent contains a large amount of harmful organic matter, which not only worsens the working environment of the operators, but also poses a serious threat to the physical and mental health of the operators; the existing treatment methods are adsorption method or combustion method, the adsorption method requires a large amount of investment in adsorption equipment, and the investment cost increases, and the combustion method is to directly send the coating solvent volatilized in the coating room to the corresponding equipment for combustion. This method consumes a lot of fuel and causes a large amount of energy consumption due to the low concentration of the coating solvent sent to the combustion; The temperature change in the coating room has a great impact on product quality. Too high a temperature will cause the paint to evaporate too quickly, which will easily produce bubbles, wrinkles, or the coating will not be able to form a complete film layer, accelerate the volatilization of the paint, and increase the solvent content of the paint in the coating room, which may cause fire or explosion hazards. Too low a temperature will affect the physical properties and chemical reaction rate of the paint, resulting in poor continuity of the coating film. Lowering the temperature will make the paint thicker and the fluidity worse, which may cause roller marks on the coating, which is not conducive to the uniform coating of the paint and affects the leveling quality. Therefore, it is extremely important to ensure a constant temperature in the coating room. Summary of the invention

[0003] The present invention provides an environmentally friendly constant temperature system and method for improving the coating yield rate, with the purpose of overcoming the problem that in the prior art, the coating solvent volatilized in the coating chamber is directly sent to the corresponding equipment for combustion. Since the concentration of the coating solvent sent for combustion is low, the combustion will consume a large amount of fuel and cause a large amount of energy consumption, and the temperature change of the coating chamber has a great impact on the product quality.

[0004] To this end, the present invention provides an environmentally friendly constant temperature system for improving the coating yield rate, comprising a coating chamber, a concentrating device, a chimney, a fresh air heat exchanger, a waste gas heat exchanger, an incinerator, a combustion-supporting pipeline and an air supply pipeline; the first air outlet of the coating chamber is connected to the concentrating inlet of the concentrating device, the clean air outlet of the concentrating device is connected to the chimney, the waste gas outlet of the coating chamber is connected to the inlet one of the waste gas heat exchanger, the outlet one of the waste gas heat exchanger is connected to the inlet of the incinerator, the outlet of the incinerator is connected to the inlet two of the waste gas heat exchanger, the outlet two of the waste gas heat exchanger is connected to the inlet one of the fresh air heat exchanger, one way of the outlet one of the fresh air heat exchanger is connected to the inlet of the desorption zone of the concentrating device, the other way of the outlet one of the fresh air heat exchanger is connected to the air inlet of the coating chamber through the air supply pipeline, and the outlet two of the fresh air heat exchanger is connected to the chimney; the second air outlet of the coating chamber is connected to the inlet of the incinerator through the combustion-supporting pipeline. Preferably, the cooling inlet of the concentrating device is connected to a cooling fan.

[0005] Preferably, a desorption fan is provided between the outlet 1 of the fresh air heat exchanger and the inlet of the desorption zone of the concentrator, and the inlet of the desorption fan is connected to the filtering device 4 through a pipeline.

[0006] Preferably, a combustion-supporting heat exchanger is provided between the second outlet of the fresh air heat exchanger and the chimney, a combustion-supporting fan is provided on the combustion-supporting pipeline, the outlet of the combustion-supporting fan is connected to the second inlet of the combustion-supporting heat exchanger, and the second outlet of the combustion-supporting heat exchanger is connected to the inlet of the incinerator.

[0007] Preferably, an air mixing box and a filter device 1 are provided on the air supply duct, an outlet 1 of the fresh air heat exchanger and an outlet 1 of the filter device 1 are both connected to the inlet of the air mixing box, and the outlet of the air mixing box is connected to the air inlet of the coating chamber.

[0008] Preferably, a static pressure box and an air conditioning unit are provided between the air mixing box and the coating chamber, the outlet of the air mixing box and the air outlet of the air conditioning unit are both connected to the inlet of the static pressure box, and the outlet of the static pressure box is connected to the air inlet of the coating chamber.

[0009] Preferably, an adsorption fan is arranged and connected between the first air outlet of the coating chamber and the concentration inlet of the concentration device, a second exhaust fan is arranged and connected between the exhaust gas outlet of the coating chamber and the inlet one of the exhaust gas heat exchanger, an exhaust fan is arranged and connected between the outlet one of the combustion-supporting heat exchanger and the chimney, an air supply fan is arranged and connected between the mixing box and the static pressure box, and a fresh air fan is arranged and connected to the inlet two of the fresh air heat exchanger.

[0010] Preferably, the inlet of the cooling fan is connected to a second filter device, and the inlet of the fresh air fan is connected to a third filter device.

[0011] Preferably, an electric fire damper is provided between the coating chamber and the adsorption fan.

[0012] An environmentally friendly constant temperature method for improving the coating yield rate comprises the following steps: a part of the coating solvent in the coating chamber enters the adsorption zone of a concentrator, the volatile clean gas adsorbed by the concentrator is discharged into the atmosphere through a chimney, the waste gas concentrated by the concentrator is preheated by a waste gas heat exchanger and then enters an incinerator for incineration, the hot gas after combustion in the incinerator enters the waste gas heat exchanger, the gas preheated by the waste gas heat exchanger enters the fresh air heat exchanger, a part of the gas preheated by the fresh air heat exchanger enters the adsorption zone of the concentrator, and the other part enters the coating chamber through an air supply pipeline; another part of the coating solvent in the coating chamber is preheated by a combustion-supporting pipeline and then enters the incinerator for incineration.

[0013] Beneficial effects of the present invention: 1. The environmentally friendly constant temperature system and method for improving the coating yield rate provided by the present invention include a coating chamber, a concentrating device, a chimney, a fresh air heat exchanger, a waste gas heat exchanger, an incinerator, a combustion-supporting pipeline and an air supply pipeline; the coating solvent in the coating chamber is concentrated by the concentrating device, and then preheated by the waste gas heat exchanger before entering the incinerator for incineration, and the concentration of the coating solvent sent to the incinerator is increased by concentration, thereby reducing the consumption of fuel gas; the hot gas after combustion in the incinerator enters the waste gas heat exchanger, and the preheated gas enters the fresh air heat exchanger. A part of the gas preheated by the fresh air heat exchanger enters the adsorption area of ​​the concentrating device, and the other part enters the coating chamber through the air supply pipeline, thereby making full use of the heat after combustion in the incinerator, and the combustion-supporting pipeline preheats the combustion-supporting air, thereby improving the utilization rate of waste heat and saving energy.

[0014] 2. The environmentally friendly constant temperature system and method for improving the coating yield rate provided by the present invention mixes the hot air supplied by the fresh air heat exchanger and the cold air supplied by the filter device 1 in the air mixing box to a suitable temperature and sends them into the coating chamber. The fresh hot air that has passed through the fresh air heat exchanger and the clean cold air that has passed through the filter device 4 are mixed to a suitable temperature and then sent to the concentration device; thus, the constant temperature of the coating chamber is ensured, the coating performance is stable, and the yield rate is improved.

[0015] 3. The environmentally friendly constant temperature system and method for improving the coating yield rate provided by the present invention ensures that the air supply temperature of the coating chamber is constant by arranging a static pressure box and an air conditioning unit between the mixing box and the coating chamber. By controlling the balance of the air outlet and air supply flow in the coating chamber, the constant temperature of the coating chamber is ensured, the coating performance is stable, and the yield rate is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described in detail below with reference to the accompanying drawings.

[0017] Figure 1 It is a structural diagram of an environmentally friendly constant temperature system for improving the coating yield rate.

[0018] Explanation of reference numerals: 1, coating chamber; 2, check valve 1; 3, static pressure box; 4, electric valve 1; 5, check valve 2; 6, air conditioning unit; 7, electric valve 2; 8, check valve 3; 9, air supply fan; 10, air mixing box; 11, electric valve 3; 12, filter device 1; 13, electric fire damper; 14, butterfly valve 1; 15, adsorption fan; 16, cooling fan; 17, butterfly valve 1; 18, filter device 2; 19 , desorption fan; 20, butterfly valve three; 21, electric valve four; 22, chimney; 23, exhaust fan one; 24, butterfly valve four; 25, combustion-supporting fan; 26, combustion-supporting heat exchanger; 27, butterfly valve five; 28, concentration device; 29, filter device three; 30, fresh air fan; 31, fresh air heat exchanger; 32, exhaust fan two; 33, exhaust gas heat exchanger; 34, incinerator; 35, electric valve five; 36, filter device four. DETAILED DESCRIPTION

[0019] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0020] Embodiment 1: like Figure 1 As shown, an environmentally friendly constant temperature system for improving the coating yield rate includes a coating chamber 1, a concentrator 28, a chimney 22, a fresh air heat exchanger 31, an exhaust gas heat exchanger 33, an incinerator 34, a combustion-supporting pipeline and an air supply pipeline; the first air outlet of the coating chamber 1 is connected to the concentrating inlet of the concentrator 28, the clean air outlet of the concentrator 28 is connected to the chimney 22, the exhaust gas outlet of the coating chamber 1 is connected to the inlet 1 of the exhaust gas heat exchanger 33, and the outlet 1 of the exhaust gas heat exchanger 33 is connected to the incinerator 3 4, the outlet of the incinerator 34 is connected to the inlet 2 of the exhaust gas heat exchanger 33, the outlet 2 of the exhaust gas heat exchanger 33 is connected to the inlet 1 of the fresh air heat exchanger 31, one way of the outlet 1 of the fresh air heat exchanger 31 is connected to the desorption zone inlet of the concentration device 28, the other way of the outlet 1 of the fresh air heat exchanger 31 is connected to the air inlet of the coating chamber 1 through the air supply pipeline, and the outlet 2 of the fresh air heat exchanger 31 is connected to the chimney 22; the second air outlet of the coating chamber 1 is connected to the inlet of the incinerator 34 through the combustion-supporting pipeline.

[0021] Specifically, the coating chamber 1 is a process site where coating takes place, and there is a large amount of coating solvent generated when coating; the coating solvent in the coating chamber 1 is concentrated by the concentrator 28, and then preheated by the exhaust gas heat exchanger 33 before entering the incinerator 34 for incineration. The concentration of the coating solvent sent to the incinerator is increased by concentration, and the consumption of fuel gas is reduced; the hot gas after combustion in the incinerator 34 enters the exhaust gas heat exchanger 33, and the preheated gas enters the fresh air heat exchanger 31. A part of the gas preheated by the fresh air heat exchanger 31 enters the adsorption area of ​​the concentrator 28, and the other part enters the coating chamber 1 through the air supply pipeline, which makes full use of the heat after combustion in the incinerator 34. The combustion-supporting pipeline preheats the combustion-supporting air, thereby improving the utilization rate of waste heat and saving energy; it has strong practicality, simple structure, and is easy to implement.

[0022] Embodiment 2: Based on Example 1, the cooling inlet of the concentrating device 28 is connected to a cooling fan 16 .

[0023] Specifically, the cooling air is sent to the cooling zone of the concentration device 28 by the cooling fan 16, so as to cool down the rotor after desorption.

[0024] Preferably, a desorption fan 19 is provided between an outlet 1 of the fresh air heat exchanger 31 and an inlet of a desorption zone of the concentrating device 28, and a filtering device 4 36 is provided at the inlet of the desorption fan 19 through a pipeline.

[0025] Specifically, the desorption fan 19 mixes the fresh hot air that has passed through the fresh air heat exchanger 31 with the clean cold air that has passed through the filter device 36 to a suitable temperature and sends them into the desorption area of ​​the concentration device 28 to remove the concentrated organic matter adsorbed on the rotor. The generated high-concentration exhaust gas is preheated by the exhaust gas heat exchanger 33 and enters the incinerator 34 for incineration treatment, thereby improving the utilization rate of waste heat and saving energy.

[0026] Embodiment 3: On the basis of Example 2, a combustion-supporting heat exchanger 26 is arranged between the second outlet of the fresh air heat exchanger 31 and the chimney 22, and a combustion-supporting fan 25 is arranged on the combustion-supporting pipeline. The outlet of the combustion-supporting fan 25 is connected to the second inlet of the combustion-supporting heat exchanger 26, and the second outlet of the combustion-supporting heat exchanger 26 is connected to the inlet of the incinerator 34.

[0027] Specifically, the volatile solvent of the paint is sent by the combustion-supporting fan 25 to the combustion-supporting heat exchanger 26 for preheating, and the solvent that has not been preheated by the combustion-supporting heat exchanger 26 is mixed to a suitable temperature and sent to the incinerator 34 for incineration; the concentration device 28 and the combustion-supporting heat exchanger 26 effectively prevent the paint solvent in the coating room from polluting the environment and affecting the health of the operators, and the concentration of the paint solvent sent to the incinerator 34 is increased by concentration, thereby reducing the consumption of gas; the combustion-supporting heat exchanger 26 preheats the combustion-supporting air, thereby improving the utilization rate of waste heat and saving energy.

[0028] Embodiment 4: Based on Example 3, a mixing box 10 and a filter device 12 are provided on the air supply pipeline, and an outlet 1 of the fresh air heat exchanger 31 and an outlet 1 of the filter device 12 are both connected to the inlet of the mixing box 10, and the outlet of the mixing box 10 is connected to the air inlet of the coating chamber 1.

[0029] Specifically, the hot air supplied by the fresh air heat exchanger 31 and the cold air supplied after filtering by the filter device 12 are mixed to a suitable temperature in the air mixing box 10 and sent to the coating chamber 1. The fresh hot air that has passed through the fresh air heat exchanger 31 and the clean cold air that has passed through the filter device 36 are mixed to a suitable temperature and then sent to the concentration device 28; the constant temperature of the coating chamber 1 is ensured, the coating performance is ensured to be stable, and the yield rate is improved.

[0030] Preferably, a static pressure box 3 and an air conditioning unit 6 are arranged between the mixing box 10 and the coating chamber 1, and the outlet of the mixing box 10 and the air outlet of the air conditioning unit 6 are both connected to the inlet of the static pressure box 3, and the outlet of the static pressure box 3 is connected to the air inlet of the coating chamber 1.

[0031] Specifically, by arranging a static pressure box 3 and an air conditioning unit 6 between the air mixing box 10 and the coating chamber 1, the air supply temperature of the coating chamber 1 is ensured to be constant. By controlling the balance of the air outlet and air supply flow rates of the coating chamber 1, the constant temperature of the coating chamber 1 is ensured, the coating performance is ensured to be stable, and the yield rate is improved.

[0032] Embodiment 5: On the basis of Example 4, an adsorption fan 15 is arranged and connected between the first air outlet of the coating chamber 1 and the concentration inlet of the concentration device 28, an exhaust fan 2 32 is arranged and connected between the exhaust gas outlet of the coating chamber 1 and the inlet 1 of the exhaust gas heat exchanger 33, an exhaust fan 1 23 is arranged and connected between the outlet 1 of the combustion-supporting heat exchanger 26 and the chimney 22, an air supply fan 9 is arranged and connected between the mixing box 10 and the static pressure box 3, and a fresh air fan 30 is arranged and connected at the inlet 2 of the fresh air heat exchanger 31.

[0033] Specifically, the air supply efficiency is improved by the adsorption fan 15, the exhaust fan 32, the air supply fan 9 and the fresh air fan 30.

[0034] Preferably, the inlet of the cooling fan 16 is connected to a second filter device 18 , and the inlet of the fresh air fan 30 is connected to a third filter device 29 .

[0035] Specifically, the cold air entering the concentration device 28 is filtered by the second filter device 18, and the cold air entering the fresh air heat exchanger 31 is filtered by the third filter device 29, thereby increasing the service life of the system.

[0036] Preferably, an electric fire damper 13 is provided and connected between the coating chamber 1 and the adsorption fan 15 .

[0037] Specifically, the electric fire damper 13 is located on the pipeline from the coating chamber 1 to the adsorption zone of the concentration device 28, which increases the fire safety of the system and effectively prevents the spread of fire when a fire occurs in the coating chamber 1.

[0038] Preferably, a check valve 1 2 is connected between the static pressure box 3 and the coating chamber 1 , a check valve 2 5 is connected between the static pressure box 3 and the air conditioning unit 6 , and a check valve 3 8 is connected between the mixing box 10 and the static pressure box 3 .

[0039] Specifically, the check valve 1 2 is used to prevent the coating solvent containing organic matter in the coating chamber 1 from flowing back and causing environmental pollution, the check valve 2 5 is used to prevent the fresh mixed air from flowing back to the air conditioning unit 6, and the check valve 3 8 is used to prevent the air from the air conditioning unit 6 from flowing back to the mixed air duct; in actual application, the check valve 1 2 is arranged on the pipeline between the coating chamber 1 and the static pressure box 3; the check valve 2 5 is arranged on the pipeline between the static pressure box 3 and the air conditioning unit 6; the check valve 3 8 is arranged on the pipeline between the static pressure box 3 and the air supply fan 9; the design of the check valve prevents the airflow from appearing in the pipeline where it should not appear.

[0040] Preferably, a 1# electric valve 4 is provided between the static pressure box 3 and the check valve 2 5, an electric valve 2 7 is provided between the static pressure box 3 and the check valve 3 8, an electric valve 3 11 is provided between the fresh air heat exchanger 31 and the mixed air box 10, an electric valve 4 21 and a butterfly valve 3 20 are provided between the fresh air heat exchanger 31 and the desorption fan 19, the outlet of the filter device 4 36 is connected to the inlet of the butterfly valve 3 20, the outlet of the butterfly valve 3 20 is connected to the inlet of the desorption fan 19, the outlet 2 of the combustion-supporting heat exchanger 26 and the outlet of the incinerator 34 are connected. An electric valve five 35 is arranged between the inlets, a butterfly valve four 24 is arranged between the coating chamber 1 and the combustion-supporting heat exchanger 26, the outlet of the combustion-supporting fan 25 is connected to the inlet of the combustion-supporting heat exchanger 26 and the inlet of the butterfly valve five 27 through a tee, one outlet of the butterfly valve five 27 is connected to the outlet of the combustion-supporting heat exchanger 26, and the other outlet of the butterfly valve five 27 is connected to the electric valve five 35, a butterfly valve one 14 is arranged between the electric fire damper 13 and the adsorption fan 15, and a butterfly valve two 17 is arranged between the filter device two 18 and the cooling fan 16.

[0041] Specifically, the electric valve controls the adjustment of the valve through the electric actuator. The electric valve 1 4 is used to adjust the fresh air supplied by the air-conditioning unit 6 to the coating chamber 1, the electric valve 2 7 is used to adjust the mixed air supplied to the static pressure box 3, the electric valve 3 11 is used to adjust the fresh hot air supplied to the mixing box 10, the electric valve 4 21 is used to adjust the fresh hot air supplied to the desorption zone of the concentration device 28, and the electric valve 5 35 is used to adjust the combustion-supporting air supplied to the incinerator 34. The design of the electric valve realizes automatic control of the process temperature of key points in the system, and has a high degree of automation.

[0042] Embodiment 6: On the basis of Example 5, an environmentally friendly constant temperature method for improving the coating yield rate comprises the following steps: a part of the coating solvent in the coating chamber 1 enters the adsorption zone of the concentrator 28, and the volatile clean gas adsorbed by the concentrator 28 is discharged into the atmosphere through the chimney 22. The exhaust gas concentrated by the concentrator 28 is preheated by the exhaust gas heat exchanger 33 and then enters the incinerator 34 for incineration. The hot gas after combustion in the incinerator 34 enters the exhaust gas heat exchanger 33, and the gas preheated by the exhaust gas heat exchanger 33 enters the fresh air heat exchanger 31. A part of the gas preheated by the fresh air heat exchanger 31 enters the adsorption zone of the concentrator 28, and the other part enters the coating chamber 1 through the air supply pipeline; another part of the coating solvent in the coating chamber 1 is preheated by the combustion-supporting pipeline and then enters the incinerator 34 for incineration.

[0043] In practical applications, the coating solvent in the coating chamber 1 is processed in two parts. Most of the coating solvent is sent to the adsorption area of ​​the concentration device 28 by the adsorption fan 15. The clean gas of volatile organic matter adsorbed by the concentration device 28 is directly discharged into the atmosphere through the chimney 22, and the concentrated exhaust gas is sent to the incinerator 34 for incineration; the cooling fan 16 sends the cold air filtered by the filter device 18 to the cooling area of ​​the concentration device 28 to cool the rotor after desorption; the desorption fan 19 mixes the fresh hot air that has been heat exchanged by the fresh air heat exchanger 31 with the clean cold air that has been passed through the filter device 4 36 to a suitable temperature and sends it to the desorption area of ​​the concentration device 28. The concentrated organic matter adsorbed on the rotor is removed, and the high-concentration waste gas generated is preheated by the waste gas heat exchanger 33 and enters the incinerator 34 for incineration treatment; the remaining small part of the paint volatile solvent is sent to the combustion-supporting heat exchanger 26 for preheating by the combustion-supporting fan 25 and the solvent that has not been preheated by the combustion-supporting heat exchanger 26 is mixed to a suitable temperature and sent to the incinerator 34 for incineration; the concentration device 28 and the combustion-supporting heat exchanger 26 effectively prevent the paint solvent in the coating room from polluting the environment and affecting the health of the operators, and the concentration of the paint solvent sent to the incinerator 34 is increased by concentration, thereby reducing the consumption of gas; the combustion-supporting heat exchanger 26 preheats the combustion-supporting air, thereby improving the utilization rate of waste heat and saving energy. The fresh hot air passing through the fresh air heat exchanger 31 and the ambient cold air passing through the filter device 12 are fully mixed to a suitable temperature in the air mixing box 10, and are sent to the static pressure box 3 at the pipeline outlet of the air-conditioning unit 6 by the air supply fan 9. Finally, the constant temperature gas is sent into the coating chamber 1 to ensure that the air supply temperature of the coating chamber 1 is constant. By controlling the balance of the air outlet and supply flow of the coating chamber 1, the constant temperature of the coating chamber 1 is guaranteed, the coating performance is ensured to be stable, and the yield rate is improved.

[0044] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "front", "inside", "right", etc. is based on the orientation or positional relationship shown in the drawings, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on the present invention.

[0045] The above examples are merely illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. All designs that are the same or similar to the present invention fall within the protection scope of the present invention.

Claims

1. An environmentally friendly constant temperature system for improving coating yield, characterized by: The coating chamber (1) comprises a coating chamber (1), a concentration device (28), a chimney (22), a fresh air heat exchanger (31), an exhaust gas heat exchanger (33), an incinerator (34), a combustion-supporting pipeline and an air supply pipeline; the first air outlet of the coating chamber (1) is connected to the concentration inlet of the concentration device (28), the clean air outlet of the concentration device (28) is connected to the chimney (22), the exhaust gas outlet of the coating chamber (1) is connected to the inlet 1 of the exhaust gas heat exchanger (33), the outlet 1 of the exhaust gas heat exchanger (33) is connected to the inlet of the incinerator (34), and the incinerator The outlet of (34) is connected to the second inlet of the exhaust gas heat exchanger (33), the second outlet of the exhaust gas heat exchanger (33) is connected to the first inlet of the fresh air heat exchanger (31), one way of the first outlet of the fresh air heat exchanger (31) is connected to the inlet of the desorption zone of the concentration device (28), the other way of the first outlet of the fresh air heat exchanger (31) is connected to the air inlet of the coating chamber (1) through the air supply pipeline, and the second outlet of the fresh air heat exchanger (31) is connected to the chimney (22); the second air outlet of the coating chamber (1) is connected to the inlet of the incinerator (34) through the combustion-supporting pipeline.

2. The environmentally friendly constant temperature system for improving coating yield as claimed in claim 1, characterized in that: The cooling inlet of the concentrating device (28) is connected to a cooling fan (16).

3. The environmentally friendly constant temperature system for improving coating yield as claimed in claim 2, characterized in that: A desorption fan (19) is provided between the outlet 1 of the fresh air heat exchanger (31) and the inlet of the desorption zone of the concentration device (28), and the inlet of the desorption fan (19) is connected to a filtering device 4 (36) via a pipeline.

4. The environmentally friendly constant temperature system for improving coating yield as claimed in claim 3, characterized in that: A combustion-supporting heat exchanger (26) is provided between the second outlet of the fresh air heat exchanger (31) and the chimney (22), a combustion-supporting fan (25) is provided on the combustion-supporting pipeline, the outlet of the combustion-supporting fan (25) is connected to the second inlet of the combustion-supporting heat exchanger (26), and the second outlet of the combustion-supporting heat exchanger (26) is connected to the inlet of the incinerator (34).

5. The environmentally friendly constant temperature system for improving coating yield as claimed in claim 4, characterized in that: An air mixing box (10) and a filter device (12) are provided on the air supply pipeline; outlet one of the fresh air heat exchanger (31) and outlet one of the filter device (12) are both connected to the inlet of the air mixing box (10); and the outlet of the air mixing box (10) is connected to the air inlet of the coating chamber (1).

6. The environmentally friendly constant temperature system for improving coating yield as claimed in claim 5, characterized in that: A static pressure box (3) and an air conditioning unit (6) are provided between the air mixing box (10) and the coating chamber (1); the outlet of the air mixing box (10) and the air outlet of the air conditioning unit (6) are both connected to the inlet of the static pressure box (3); and the outlet of the static pressure box (3) is connected to the air inlet of the coating chamber (1).

7. The environmentally friendly constant temperature system for improving coating yield as claimed in claim 6, characterized in that: An adsorption fan (15) is arranged and connected between the first air outlet of the coating chamber (1) and the concentration inlet of the concentration device (28); an exhaust fan (32) is arranged and connected between the exhaust gas outlet of the coating chamber (1) and the inlet 1 of the exhaust gas heat exchanger (33); an exhaust fan (23) is arranged and connected between the outlet 1 of the combustion-supporting heat exchanger (26) and the chimney (22); an air supply fan (9) is arranged and connected between the air mixing box (10) and the static pressure box (3); and a fresh air fan (30) is arranged and connected at the inlet 2 of the fresh air heat exchanger (31).

8. The environmentally friendly constant temperature system for improving coating yield as claimed in claim 7, characterized in that: The inlet of the cooling fan (16) is connected to a second filter device (18), and the inlet of the fresh air fan (30) is connected to a third filter device (29).

9. The environmentally friendly constant temperature system for improving coating yield as claimed in claim 8, characterized in that: An electric fire damper (13) is provided and connected between the coating chamber (1) and the adsorption fan (15).

10. An environmentally friendly constant temperature method for improving coating yield, characterized in that: The invention comprises the following steps: a part of the coating solvent in the coating chamber (1) enters the adsorption zone of the concentration device (28); the volatile clean gas adsorbed by the concentration device (28) is discharged into the atmosphere through the chimney (22); the waste gas concentrated by the concentration device (28) is preheated by the waste gas heat exchanger (33) and then enters the incinerator (34) for incineration; the hot gas after combustion in the incinerator (34) enters the waste gas heat exchanger (33); the gas preheated by the waste gas heat exchanger (33) enters the fresh air heat exchanger (31); a part of the gas preheated by the fresh air heat exchanger (31) enters the adsorption zone of the concentration device (28), and another part enters the coating chamber (1) through the air supply pipeline; another part of the coating solvent in the coating chamber (1) is preheated by the combustion-supporting pipeline and then enters the incinerator (34) for incineration.

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