System for drying paint slag using RTO waste heat from painting

Abstract

The present application relates to the field of paint slag treatment, and in particular to a system for drying paint slag using regenerative thermal oxidizer (RTO) waste heat from painting. The present application provides a system for drying paint slag, comprising an RTO heat exchange apparatus, a hot water circulation apparatus and a paint slag drying apparatus which are sequentially communicated with each other. The present application provides a device for drying paint slag using RTO waste heat, which not only avoids waste of RTO waste heat, but also saves power consumption or steam consumption required by drying a large amount of paint slag, thereby achieving virtuous cycle of energy utilization.

Description

A system that uses RTO waste heat from painting to dry paint residue Technical Field

[0001] The present application relates to the field of paint residue treatment, and in particular to a system for drying paint residue using waste heat from RTO painting. Background Art

[0002] Modern automobile paint shops produce a large amount of paint residue in the wet venturi system. The moisture content of the newly produced paint residue can generally reach more than 90%. Even after a long period of drainage, its moisture content is still around 70%. Excessive moisture content leads to high costs for hazardous waste disposal. Therefore, many paint residue dehydration processes and equipment have been developed to reduce the moisture content of the paint residue as much as possible, achieve the purpose of reduction, and ultimately reduce the cost of hazardous waste treatment.

[0003] Drying and dehydration is a commonly used method for dehydrating paint residue. Existing technologies such as CN213416632U and CN107597810B use this method for drying paint residue. However, this method consumes a large amount of energy, primarily using electricity or high-temperature steam to heat the air from a blower before air-drying the paint residue. While drying and dehydration can reduce the moisture content of paint residue, the electricity or steam consumption is also high. For example, theoretically, evaporating one ton of water requires 750KWh of electricity. However, considering the energy losses associated with heating the air and the utilization rate of the heated air, the actual power consumption is far higher.

[0004] Therefore, to reduce power consumption and improve paint residue drying efficiency, it is necessary to design an alternative energy source that can achieve both paint residue reduction and further reduce energy consumption. Furthermore, the paint residue drying process produces a large amount of organic gas and paint residue particles, both of which are flammable substances. Therefore, there are strict requirements for the drying temperature, generally controlled below 70°C. Therefore, the alternative energy source must be safe, stable, easily accessible, and easy to promote and apply.

[0005] RTOs, or regenerative thermal incinerators, are primarily used to treat factory exhaust containing organic pollutants. While incinerating the exhaust, they generate a significant amount of heat, some of which is recycled into the workshop for central air conditioning and heating. However, since heating is only needed in winter, a significant amount of excess heat remains unused, resulting in energy waste.

[0006] Therefore, it is necessary to develop a device that utilizes RTO waste heat for paint residue drying, thereby avoiding the waste of RTO waste heat, saving a large amount of electricity or steam consumption required for paint residue drying, and realizing a virtuous cycle of energy utilization.

[0007] Application Contents

[0008] In view of the above-mentioned shortcomings of the prior art, the present application provides a system for using the waste heat of RTO painting to dry paint residue, so as to solve the problem faced in the prior art that paint residue drying requires a large amount of electricity or steam consumption.

[0009] To achieve the above-mentioned and other related purposes, the first aspect of the present application provides a paint residue drying system, comprising a heat storage incinerator heat exchange device, a hot water circulation device and a paint residue drying device connected in sequence.

[0010] In any embodiment of the present application, the regenerative incinerator heat exchange device includes a regenerative incinerator waste heat air inlet duct, a regenerative incinerator chamber air-water heat exchanger and a regenerative incinerator waste heat exhaust duct connected in sequence.

[0011] In any embodiment of the present application, a first temperature control valve is provided on the waste heat air inlet duct of the thermal storage incinerator.

[0012] In any embodiment of the present application, the hot water circulation device includes a water inlet pipe and a water outlet pipe for fluid circulation with the gas-water heat exchanger in the thermal storage incinerator chamber, so that the fluid flows through the water inlet pipe, the gas-water heat exchanger in the thermal storage incinerator chamber and the water outlet pipe in sequence; a first thermometer is provided on the water inlet pipe.

[0013] In any embodiment of the present application, the water outlet pipe is provided with a pipe filter, a variable frequency hot water pump and a second temperature control valve in sequence along the fluid flow direction.

[0014] In any embodiment of the present application, the water outlet pipe is further provided with a water supply bypass along the fluid flow direction, and the water supply bypass is provided with a constant pressure water supply device.

[0015] In any embodiment of the present application, the paint residue drying device includes a paint residue drying fan, a paint residue drying air inlet pipe, a paint residue drying air-water heat exchanger, a paint residue drying air outlet pipe and paint residue drying equipment connected in sequence.

[0016] In any embodiment of the present application, one end of the water inlet pipe is connected to the gas-water heat exchanger in the thermal storage incinerator chamber, and the other end is connected to the paint residue drying gas-water heat exchanger; one end of the water outlet pipe is connected to the gas-water heat exchanger in the thermal storage incinerator chamber, and the other end is connected to the paint residue drying gas-water heat exchanger.

[0017] In any embodiment of the present application, a second thermometer is provided on the paint residue drying equipment.

[0018] A second aspect of the present application provides a paint residue drying system, further comprising a controller, wherein the controller is communicatively connected to at least one selected from the group consisting of a first temperature control valve, a first thermometer, a second temperature control valve, and a second thermometer.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. This application develops a device that utilizes RTO waste heat for paint residue drying, which not only avoids the waste of RTO waste heat, but also saves a lot of electricity or steam consumption required for paint residue drying, realizing a virtuous cycle of energy utilization.

[0021] 2. This application sets up a hot water circulation device and uses hot water as the heat exchange medium of the air-water heat exchanger in the thermal storage incinerator chamber, instead of directly using the high-temperature RTO waste heat for paint residue drying. This avoids the risk of the RTO waste heat inlet temperature being too high, which may be caused by direct use for paint residue drying, resulting in the paint residue temperature being too high and the paint residue quickly producing VOCs (volatile organic compounds) and causing explosions; it also avoids the safety hazards brought by high-temperature gas to the operators of the paint residue drying device, thereby realizing the safe utilization of RTO waste heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG1 shows a schematic diagram of the structure of the present application.

[0023] Component number description:

[0024] 1 Incinerator heat exchange device

[0025] 11 Regenerative incinerator waste heat air inlet duct

[0026] 111 First Temperature Control Valve

[0027] 12. Gas-water heat exchanger in thermal storage incinerator chamber

[0028] 13. Regenerative incinerator waste heat exhaust duct

[0029] 2 Hot water circulation device

[0030] 21 Water inlet pipe

[0031] 211 First Thermometer

[0032] 22 Water outlet pipe

[0033] 221 Pipeline Filter

[0034] 222 variable frequency hot water pump

[0035] 223 Second temperature control valve

[0036] 224 water supply bypass

[0037] 225 Constant pressure water supply equipment

[0038] 3 Paint residue drying device

[0039] 31 Fan for drying paint residue

[0040] 32 Paint residue drying gas-water heat exchanger

[0041] 33 Paint residue drying equipment

[0042] 331 Second Thermometer

[0043] 34 Paint residue drying air inlet pipe

[0044] 35 Paint residue drying air outlet pipe DETAILED DESCRIPTION

[0045] The following further describes the specific embodiments of the present application in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present application and are not intended to limit the present application.

[0046] Terms such as "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" indicate positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of this application and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0048] Furthermore, in the description of the present application, unless otherwise specified, “plurality” means two or more.

[0049] Please refer to Figure 1. It should be noted that the diagrams provided in this embodiment are merely schematic illustrations of the basic concept of the present application. Therefore, the diagrams only show components relevant to the present application and are not drawn according to the number, shape, and size of components in actual implementation. In actual implementation, the type, quantity, and proportion of each component may be varied arbitrarily, and the component layout may also be more complex.

[0050] As shown in FIG1 , the present application provides a paint residue drying system, comprising a regenerative incinerator heat exchange device 1 , a hot water circulation device 2 and a paint residue drying device 3 connected in sequence.

[0051] An RTO (regenerative thermal incinerator) is primarily used to treat factory exhaust containing organic pollutants. While incinerating the exhaust, it generates a significant amount of heat. This application develops a device that utilizes RTO waste heat for paint residue drying. This not only avoids wasteful RTO waste heat but also significantly reduces the electricity and steam consumption required for paint residue drying, achieving a virtuous cycle of energy utilization.

[0052] As shown in Figure 1, in the paint residue drying system provided herein, the regenerative incinerator heat exchanger 1 includes a regenerative incinerator waste heat air inlet duct 11, a regenerative incinerator chamber air-water heat exchanger 12, and a regenerative incinerator waste heat exhaust duct 13, which are sequentially connected. A first temperature control valve 111 is provided on the regenerative incinerator waste heat air inlet duct 11.

[0053] In a specific embodiment, the temperature of the waste heat inlet duct 11 of the thermal incinerator is higher than the temperature of the waste heat exhaust duct 13 of the thermal incinerator. For example, the temperature of the waste heat inlet duct 11 of the thermal incinerator can be 200°C, and the temperature of the waste heat exhaust duct 13 of the thermal incinerator can be 100°C.

[0054] In one specific embodiment, the regenerative incinerator chamber's air-to-water heat exchanger 12 is used to transfer RTO waste heat to hot water in the hot water circulation unit 2. This regenerative incinerator chamber's air-to-water heat exchanger 12 typically utilizes a finned heat exchanger, with the fins connected to the RTO waste heat air inlet and the heat exchange tubes connected to the hot water in the hot water circulation unit 2. The fins can be made of stainless steel, aluminum, or copper, with stainless steel being preferred for its low cost and corrosion resistance. The heat exchange tubes can be made of conventional materials such as stainless steel, carbon steel, and copper, with copper being preferred for its high heat exchange efficiency and corrosion resistance.

[0055] In a specific embodiment, the gas-water heat exchanger 12 in the regenerative incinerator chamber is located in the RTO chamber. The gas side of the gas-water heat exchanger 12 in the regenerative incinerator chamber is the high-temperature gas generated during the incineration of the waste gas, and the air intake temperature can reach hundreds of degrees Celsius. The water side is a closed circulating hot water. Hot water is used as the heat exchange medium here, and the high-temperature RTO waste heat intake air is not directly used for paint residue drying. The reasons are: 1. The RTO waste heat intake air temperature is too high. Direct use for paint residue drying can easily lead to excessively high paint residue temperature, and the paint residue quickly produces VOCs (volatile organic compounds), leading to the risk of explosion; 2. High-temperature gas also poses a safety hazard to operators in the paint residue drying area. After adopting the circulating hot water system, the RTO waste heat is first transferred to hot water, and then the hot water transfers the heat to the paint residue drying intake air for a second time, thereby realizing the safe utilization of RTO waste heat.

[0056] As shown in Figure 1, in the paint residue drying system provided in the present application, the hot water circulation device 2 includes a water inlet pipe 21 and a water outlet pipe 22 for fluid circulation with the gas-water heat exchanger 12 in the thermal storage incinerator chamber, so that the fluid flows through the water inlet pipe 21, the gas-water heat exchanger 12 in the thermal storage incinerator chamber and the water outlet pipe 22 in sequence.

[0057] As shown in FIG1 , in the paint residue drying system provided in the present application, the paint residue drying device 3 includes a paint residue drying fan 31 , a paint residue drying air-water heat exchanger 32 and a paint residue drying equipment 33 which are connected in sequence.

[0058] In a specific embodiment, the paint residue drying fan 31 generally adopts a centrifugal fan with a large air volume to ensure the air volume required for drying the paint residue in the paint residue drying equipment.

[0059] In one specific embodiment, one end of the water inlet pipe 21 is connected to the regenerative incinerator chamber air-water heat exchanger 12, and the other end is connected to the paint residue drying air-water heat exchanger 32. One end of the water outlet pipe 22 is connected to the regenerative incinerator chamber air-water heat exchanger 12, and the other end is connected to the paint residue drying air-water heat exchanger 32. A first thermometer 211 is provided on the water inlet pipe 21.

[0060] In one specific embodiment, the water in the water outlet pipe 22 is heated by the regenerative incinerator chamber heat exchanger 12, resulting in a certain degree of increase in the water temperature compared to the water in the hot water inlet pipe 21. The hot water circulation device 2 then transfers the heat to the paint residue drying device 3 via the paint residue drying gas-water heat exchanger 32. More specifically, the water temperature in the water inlet pipe 21 can be, for example, 60°C, and the water temperature in the water outlet pipe 22 can be, for example, 80°C.

[0061] As shown in Figure 1 , in the paint residue drying system provided herein, a water outlet pipe 22 is provided with a pipe filter 221, a variable frequency hot water pump 222, and a second temperature control valve 223, in sequence along the fluid flow direction. A water supply bypass 224 is also provided along the fluid flow direction, and a constant pressure water supply device 225 is installed on the water supply bypass 224.

[0062] In a specific embodiment, there can be two variable frequency hot water pumps 222, for example, one for actual use and one for backup. In actual operation, the two variable frequency hot water pumps 222 can also be used alternately, which is beneficial to extending the service life of the variable frequency hot water pumps.

[0063] In a specific embodiment, since the temperature change of the circulating hot water device 2 causes the volume of hot water to change, and the leakage of hot water requires water replenishment, a constant pressure water replenishment device 225 is required to keep the water pressure in the circulating hot water device 2 in a stable state.

[0064] As shown in Figure 1 , in the paint residue drying system provided herein, the paint residue drying device 3 further includes a paint residue drying air inlet pipe 34 for connecting the paint residue drying fan 31 and the paint residue drying air-water heat exchanger 32. The paint residue drying device 3 also includes a paint residue drying air outlet pipe 35 for connecting the paint residue drying air-water heat exchanger 32 and the paint residue drying equipment 33. The paint residue drying equipment 33 is provided with a second thermometer 331.

[0065] In one specific embodiment, the paint residue drying air-water heat exchanger 32 is used to transfer heat from the hot water circulation device 2 to the paint residue drying device 2. The paint residue drying air-water heat exchanger 32 is typically a finned heat exchanger, with the fins connected to the paint residue drying air inlet pipe 34 and the heat exchange pipes connected to the hot water from the hot water circulation device 2. The fins can be made of stainless steel, aluminum, or copper, with stainless steel being preferred for its low cost and corrosion resistance. The heat exchange pipes can be made of conventional materials such as stainless steel, carbon steel, and copper, with copper being preferred for its high heat exchange efficiency and corrosion resistance.

[0066] As shown in Figure 1, the paint residue drying system provided in the present application further includes a controller, which is communicatively connected to at least one of the first temperature-controlled valve 111, the first thermometer 211, the second temperature-controlled valve 223, and the second thermometer 331. In a preferred embodiment of the present application, the controller is communicatively connected to the first temperature-controlled valve 111, the first thermometer 211, the second temperature-controlled valve 223, and the second thermometer 331. In order to ensure that the temperature of the paint residue drying device 3 is controlled within a certain range, it is necessary to adjust the RTO waste heat supply, which is specifically achieved through the first temperature-controlled valve 111, the second temperature-controlled valve 223, the first thermometer 211, the second thermometer 331, and the controller. The present application realizes automatic temperature control adjustment of the system by setting a controller. When the second thermometer 331 measures that the temperature of the paint residue drying equipment 33 exceeds the high temperature setting value (the setting value can be 70-75°C, for example), the second temperature control valve 223 can be automatically closed through the automatic control program, so that the amount of hot water entering the paint residue drying gas-water heat exchanger 32 is reduced, and the heat brought into the paint residue drying equipment 33 by the paint residue drying fan 31 is reduced, thereby reducing the temperature in the paint residue drying equipment. At the same time, the amount of hot water in the paint residue drying gas-water heat exchanger 32 is reduced, causing the water temperature of the water inlet pipe 21 in the circulating hot water device to rise. When the first thermometer 211 measures that the temperature exceeds the set value, the first temperature control valve 111 can be closed through the automatic control program, so that the waste heat air intake entering the gas-water heat exchanger 12 of the thermal storage incinerator chamber is reduced, thereby causing the water temperature of the outlet pipe 22 of the hot water circulation device 2 to drop accordingly. On the contrary, when the temperature in the paint residue drying equipment 33 is lower than the set value, the automatic control program can also be used to open the relevant temperature control valve, increase the RTO waste heat air intake or the circulating hot water flow, or increase both simultaneously, so that the temperature of the paint residue drying device 3 is always stable within a certain range to ensure the paint residue drying effect and operation safety.

[0067] The working process of this application is as follows:

[0068] First, the system of the present application is connected to the waste heat pipe of the thermal storage incinerator, so that the waste heat of the thermal storage incinerator can enter the waste heat air inlet pipe 11 of the thermal storage incinerator and enter the gas-water heat exchanger 12 of the thermal storage incinerator chamber through the first temperature control valve 111.

[0069] The temperature of the regenerative incinerator's waste heat inlet duct 11 is set at 200°C. Hot water at 60°C is injected into the hot water circulation device 2 through the water inlet duct 21. This water exchanges heat with the RTO waste heat in the regenerative incinerator chamber's air-water heat exchanger 12. After the heat exchange, the water temperature rises while the air temperature drops. The exchanged gas is discharged from the regenerative incinerator's waste heat exhaust duct 13 at a temperature of 100°C. The hot water flows out of the water outlet duct 22 at a temperature of 80°C. Water in the water outlet duct 22 flows through a pipe filter 221, a variable-frequency hot water pump 222, and a second temperature control valve 223 before entering the paint residue drying gas-water heat exchanger 32. To maintain a stable water pressure within the circulating hot water device 2, a water replenishment bypass 224 can be provided. A constant-pressure water replenishment device 225 is installed on the water replenishment bypass 224 to provide timely water replenishment to facilitate control of hot water volume changes and water leakage.

[0070] The paint residue drying fan 31 blows 30°C air into the paint residue drying air inlet pipe 34, and exchanges air and water with the 80°C hot water in the water outlet pipe 22 in the paint residue drying air-water heat exchanger 32. After the heat exchange, the water temperature drops and the air temperature rises. The hot water after the heat exchange drops to 60°C, flows out from the water inlet pipe 21 and enters the heat storage incinerator chamber air-water heat exchanger 12 for circulation again. The wind temperature after the heat exchange rises to 70°C, and enters the paint residue drying equipment 33 through the paint residue drying air outlet pipe 35, so that the temperature of the paint residue drying equipment 33 meets the requirements of paint residue drying. The exhaust gas discharged from the paint residue drying equipment 33 is collected by the exhaust gas collection pipe network and enters the RTO incineration treatment, thereby realizing the safe operation of the entire device.

[0071] The entire device also features automatic temperature control. When the second thermometer 331 measures a temperature inside the paint residue drying device 33 exceeding a set high temperature value, the automatic program automatically closes the second temperature-controlled valve 223, reducing the amount of hot water entering the paint residue drying air-to-water heat exchanger 32 and causing the water temperature in the water inlet pipe 21 of the circulating hot water device to rise. When the first thermometer 211 measures a temperature exceeding a set value, the automatic program automatically closes the first temperature-controlled valve 111, reducing the amount of waste heat air entering the regenerative incinerator chamber's air-to-water heat exchanger 12 and subsequently lowering the water temperature in the water outlet pipe 22 of the hot water circulation device 2. Ultimately, the temperature of the paint residue drying device 3 remains stable within a certain range, ensuring both effective paint residue drying and operational safety.

[0072] The specific implementation methods of the present application are further described in detail below with reference to the examples.

[0073] Comparative Example 1

[0074] A coating production workshop is equipped with a paint residue drying device (including a paint residue drying fan, air duct and paint residue drying equipment), and an electric heater is used to provide air supply heat source. In order to reduce the moisture content of the paint residue from 75% to 35%, assuming that there is 1 ton of paint residue with a moisture content of 75%, according to the principle of conservation of solid mass, the amount of paint residue when it is dried to a moisture content of 35% is: 1*(1-75%) / (1-35%)=0.385 tons, then the reduction rate is (1-0.386) / 1*100%=61.5%, and hot air with a temperature of not less than 65°C needs to be continuously provided; the workshop produces about 1.5 tons of paint residue with a moisture content of 75% per day, so the drying water loss needs to reach 0.92 tons, the power consumption exceeds 1000KWh / day, and the operating cost is high.

[0075] Example 1

[0076] A coating production workshop is equipped with a system that uses the RTO waste heat from coating to dry paint residues. The parameters are as follows:

[0077] The inlet air temperature of the gas-water heat exchanger 12 in the regenerative incinerator chamber is 200°C, and the outlet air temperature is 100°C;

[0078] Flow rate of variable frequency hot water pump 222: 10m 3 / h;

[0079] Air volume of paint residue drying fan 31: 3500m 3 / h

[0080] The inlet air temperature of the paint residue drying gas-water heat exchanger 32 is 30°C, and the outlet air temperature is 70°C;

[0081] The water temperature of the water inlet pipe 21 of the hot water circulation device 2 is 60°C, and the water temperature of the water outlet pipe 22 is 80°C;

[0082] The temperature of the paint residue drying equipment 33 is 65±3°C, and the temperature is automatically controlled by a temperature controller.

[0083] In order to achieve the same paint residue drying effect as that of Comparative Example 1, the total power consumption is only about 20KWh / day (mainly for the circulation pump), which greatly saves power consumption.

[0084] In summary, this application has developed a device that utilizes RTO waste heat for paint residue drying, which not only avoids the waste of RTO waste heat, but also saves a large amount of electricity or steam consumption required for paint residue drying, realizing a virtuous cycle of energy utilization. Therefore, this application effectively overcomes the various shortcomings of traditional technology and has high production utilization value.

[0085] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical concepts disclosed in this application shall be covered by the claims of this application.

Claims

1. A system for using RTO waste heat from painting to dry paint residue, characterized in that: The invention comprises a regenerative incinerator heat exchange device (1), a hot water circulation device (2) and a paint residue drying device (3) which are connected in sequence; the regenerative incinerator heat exchange device (1) comprises a regenerative incinerator waste heat air inlet duct (11), a regenerative incinerator chamber air-water heat exchanger (12) and a regenerative incinerator waste heat exhaust duct (13) which are connected in sequence.

2. The system for using the RTO waste heat from painting for drying paint residues as claimed in claim 1, characterized in that: The regenerative incinerator waste heat air inlet duct (11) is provided with a first temperature control valve (111).

3. The system for using the waste heat from RTO painting for drying paint residues as claimed in claim 1, characterized in that: The hot water circulation device (2) comprises a water inlet pipe (21) and a water outlet pipe (22) for fluid communication with the gas-water heat exchanger (12) in the thermal storage incinerator chamber, so that the fluid flows through the water inlet pipe (21), the gas-water heat exchanger (12) in the thermal storage incinerator chamber and the water outlet pipe (22) in sequence; a first thermometer (211) is provided on the water inlet pipe (21).

4. The system for using the waste heat from RTO painting for drying paint residues as claimed in claim 3 is characterized in that: The water outlet pipe (22) is provided with a pipe filter (221), a variable frequency hot water pump (222) and a second temperature control valve (223) in sequence along the fluid flow direction.

5. The system for using the waste heat from RTO painting for drying paint residues as claimed in claim 3, characterized in that: The water outlet pipe (22) is also provided with a water replenishment bypass (224) along the fluid flow direction, and a constant pressure water replenishment device (225) is provided on the water replenishment bypass (224).

6. The system for using the waste heat from RTO painting for drying paint residues as claimed in claim 3, characterized in that: The paint residue drying device (3) comprises a paint residue drying fan (31), a paint residue drying air inlet pipe (34), a paint residue drying air-water heat exchanger (32), a paint residue drying air outlet pipe (35) and a paint residue drying device (33) which are connected in sequence.

7. The system for using the waste heat from RTO painting for drying paint residues as claimed in claim 6, characterized in that: One end of the water inlet pipe (21) is connected to the gas-water heat exchanger (12) in the thermal storage incinerator chamber, and the other end is connected to the paint residue drying gas-water heat exchanger (32); one end of the water outlet pipe (22) is connected to the gas-water heat exchanger (12) in the thermal storage incinerator chamber, and the other end is connected to the paint residue drying gas-water heat exchanger (32).

8. The system for using the waste heat from RTO painting to dry paint residues as claimed in claim 6, characterized in that: The paint residue drying device (33) is provided with a second thermometer (331).

9. The system for using the waste heat from RTO painting for drying paint residues as claimed in any one of claims 1 to 8, characterized in that: It also includes a controller, which is communicatively connected to at least one selected from the first temperature control valve (111), the first thermometer (211), the second temperature control valve (223) and the second thermometer (331).

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