KR100853937B1 - Wasteheat recovery system applied for the pre-washing system of body painting process - Google Patents

Abstract

A waste heat recovery system of regenerative thermal oxidation equipment is provided to reuse waste heat as a heat source for a water reservoir used for cleaning, pre-degreasing, degreasing, and conversion treatment processes. A waste heat recovery system of regenerative thermal oxidation equipment(1) comprises a heat exchanger(4) installed in a heat exchange chamber(13) of an auxiliary stack(12), a hot water tank(2), and water reservoirs(81,82,83,84). Harmful gas generated during the painting process for a vehicle body is heat-exchanged with thermal energy of exhaust gas by the heat exchanger. The hot water tank receives thermal energy from the heat exchanger to supply the thermal energy to the water reservoirs used in the cleaning, pre-degreasing, degreasing, and conversion treatment processes.

Description

WASTEHEAT RECOVERY SYSTEM APPLIED FOR THE PRE-WASHING SYSTEM OF BODY PAINTING PROCESS}

    The present invention recovers waste heat from regenerative thermal oxidation (RTO), which burns and incinerates harmful gases discharged from the vehicle body painting process, and in the pretreatment process of the body body painting process, hot water and Preliminary degreasing, degreasing, conversion treatment Temperature rise in the tank body pre-processing process to be recycled as a heat source necessary for raising the temperature and maintaining the temperature of the tank And it relates to a waste heat recovery system of the heat storage incineration plant for maintaining the temperature.

In the automobile production process, after the vehicle body is completed, the coating process is performed for the purpose of preventing corrosion, soundproofing, and rust prevention of the vehicle body.To perform such a coating process, first, a chemical film is formed on the surface of the vehicle body and the surface of the inside to prevent rust resistance and The pretreatment process is performed for the purpose of increasing the adhesion of the electrodeposition paint.

   The car body painting process is transferred to the painting factory after completion of the car body, and the coating and drying work is carried out mainly by electrodeposition drying ovens and the like with thermosetting paints. In this electrodeposition drying process, toxic gases (VOCs) composed of carbon and hydrogen are Expensive facility costs are required, while operating costs are burned through regenerative thermal oxidation (RTO), which is reduced to environmental regulation, and then evacuated to less than environmental regulations.

The regenerative incineration facility burns harmful gases generated in the car body painting process in a high temperature combustion chamber and discharges them at a high temperature of about 200 ° C. When the high temperature burned exhaust gas is discharged as it is, its energy loss is not high. Various attempts have been made to recover waste heat from the exhaust gas discharged into the furnace.

Looking at this in more detail below.

Waste heat recovery system for various purposes and uses to recover waste heat from regenerative incineration facility that burns and discharges harmful gases such as volatile organic compounds (VOCs) and organic odor generated during paint electrodeposition and drying process at high temperature This is known, the prior art and the like related to the waste heat recovery in the heat storage type incineration facilities and the like as described below.

     In Korean Patent Laid-Open Publication No. 10-2005-0081203 (published on Aug. 18, 2005), an inner casing serving as a discharge pipe of the combustion gas is used as an inner wall thereof to recover waste heat of the combustion gas discharged from various combustion apparatuses. A plurality of waste heat recovery chambers, which serve as outer walls and form a storage space for the heat medium liquid, are stacked and installed along the discharge pipe. Each waste heat recovery chamber has a feed pipe, a main heating pipe, a branch head, and a mixing head. By connecting a water supply line from the cold water inlet pipe to the hot water discharge pipe, the waste heat contained in the combustion gas is recovered as the heat medium to heat the heated fluid, thereby minimizing the discharge resistance of the combustion gas and greatly improving the waste heat recovery performance. A regenerative waste heat recovery system is listed.

    Korean Patent Publication No. 10-2006-0126885 (published Dec. 11, 2006) discloses a combustion chamber for incineration of hazardous gases containing volatile organic compounds, a plurality of heat storage chambers provided with heat storage materials, and harmful gas inflow into the heat storage chamber. A regenerative combustion oxidizer having a flow path switching means for cross-connecting a pipe and a clean air exhaust pipe which has been treated, and a bypass pipe for preventing overheating of the combustion chamber, wherein the exhaust portion branched from the bypass recovery pipe and the clean air exhaust pipe in the combustion chamber. The engine is connected to a hot air mixing device that mixes air from both sides and a hot air pipe connected to it to supply mixed hot air to a separate dryer, and the waste heat bypassed from the combustion chamber is utilized as the hot air of drying required by the relevant industrial site. Waste heat utilization hot air production system of regenerative combustion oxidizer to reduce energy and operating cost Published.

    Korean Patent Publication No. 10-2001-0097779 (published 11/08/2001) discloses a mixture of an exhaust gas to be treated and a feed fuel converted into a gaseous phase and supplied together into an exhaust gas treatment duct, and is generated by self-oxidation of fuel in a catalyst layer. It is composed of a system that maintains the temperature of the catalyst layer by heat that is oxidized and at the same time oxidizes and removes contaminants from the surface of the catalyst layer, and recovers the heat of the exhaust gas purified by combustion and flows into the catalytic oxidizer. This article describes how to configure and operate a gaseous pollutant control RCO system that minimizes the supplementary thermal energy required to raise the pollutant to its oxidation temperature by preheating it.

    Patent No. 10-0551269 (published date 2006. 02.03.) Discloses that high temperature heat generated from a combustion furnace is supplied as air supplied from a first heat exchanger, and the heated air is introduced into a waste pyrolysis process while The high temperature heat generated in the furnace is introduced into the furnace, and the second heat exchanger in the furnace exchanges the high temperature heat generated in the furnace with the supplied air to recover waste heat, and re-injects the waste heat into the molten slag of the furnace so that the waste itself. Waste heat recovery heat storage method of waste pyrolysis smelting furnace has been published that maximizes energy efficiency by recovering waste heat by maximizing the heat of combustion and reinjecting and regenerating it into the process.

    Korean Patent Publication No. 10-0680028 (published date 2007. 02.01.) Includes a waste heat recovery heat exchanger that recovers waste heat of hot gas discharged from a combustion chamber, and a part of the cooled gas circulated to the front end of the waste heat recovery heat exchanger. Residual incinerator that combines the remaining gas other than the circulating blower and the circulating gas to the suction side or the discharge side of the main blower installed at the inlet of the regenerative incinerator, and consists of the air volume control valve controlled by the temperature sensor. Waste heat recovery system for recovering high temperature waste heat discharged from

    Korean Patent Publication No. 10-2004-0089460 (published on October 21, 2004) discloses high-efficiency heat energy recovery and reuse by using hot gas generated in a combustion chamber of a combustion furnace in a combustion chamber closed circuit. Has been published as a method of recovering heat energy of a regenerative combustion furnace in which heat energy can be recovered as a tubular heat exchanger having a parallel flow.

    Japanese Patent Application Laid-Open No. 14-257331 (published Sep. 11, 2002) includes an air supply blower, a heat storage body, a switching valve, an air supply passage, an exhaust passage, and a heat exchanger during a year for exhausting a high temperature exhaust gas. It is published about how to collect.

     On the other hand, Korean Patent Laid-Open Publication No. 10-2006-0126884 (published date 12.11.) Discloses a high temperature exhaust gas generated in a high temperature combustion chamber in a heat storage chamber combustion oxidizing apparatus (RTO), and bypasses a boiler tank through a bypass return pipe. It is disclosed about the waste heat utilization steam production system of the regenerative combustor which causes the steam production to be made and then flows back to the combustion chamber and is discharged after the second heat exchange in the heat storage chamber.

    Hereinafter, the pretreatment process of the vehicle body coating to which the waste heat recovery system of the present invention is applied will be described in more detail.

    As already mentioned, the vehicle body painting process undergoes a pretreatment process for electrodeposition of paint prior to painting, and this pretreatment process is performed to remove rust preventive oil, foreign substances, impurities, corrosion resistance, and adhesion before painting the body.

    In other words, the body is pretreated before the painting for the above-mentioned purposes and reasons: preliminary washing-hot washing-preliminary degreasing-1st washing-2nd washing-3rd washing-chemical coating-4th washing-5th washing-6th washing-pure washing To carry out the process,

During the various steps described above, the hot water washing step is used to clean the surface foreign matter or rust-preventive oil by spraying with hot water, dip (DIP) method, and in the preliminary degreasing and degreasing step to remove residual contaminants with a degreasing agent added with a degreasing agent. In the chemical conversion step, the non-conductive phosphoric acid, zinc coating, etc. are formed on the metal surface. In the water bath of the step of hot water, pre-degreasing, degreasing and chemical conversion, the temperature of the water is raised to 40 to 60 ° C. It is required to maintain and accordingly the hot water, preliminary degreasing, degreasing, the tank portion of the chemical conversion film is installed and operating a separate heater for maintaining the temperature and temperature of the hot water and degreasing liquid.

The present invention recovers waste heat from a regenerative incineration facility that burns and discharges volatile gases (VOCs) generated in the body painting process, and preliminary hot water-hot water-preliminary degreasing-first flush-second flush-third The water temperature of the tank in the 'hot water, pre-degreasing, degreasing, and chemical film' stages during the body coating pretreatment process, such as water washing-chemical coating-fourth washing-fifth washing-six washing-pure water It is intended to be recycled as a heat source that is heated and maintained at -45 ℃.

More specifically, the present invention provides a control damper connected to the incineration facility and the pretreatment process in two places in the exhaust gas stack of the heat storage type incineration facility that burns and exhausts the combustion gas generated in the vehicle body painting process at a high temperature. Waste heat is recovered from the high-temperature exhaust gas that is installed and discharged, and the energy is saved by recycling it as a heat source for hot water, pre-degreasing, degreasing, and chemical conversion coatings that require elevated temperature and temperature maintenance during the pretreatment process of the vehicle body coating. It is.

     In addition, the present invention, the above-mentioned energy through the installation and operation of the waste heat recovery device for recovering and recycling the waste heat for hot water, pre-degreasing, degreasing, the temperature rise and temperature maintenance of the tank of the chemical coating during the vehicle body painting pretreatment process In addition to the savings, it also contributes to the stabilization of the work of the pretreatment process system.

The present invention is a heat exchanger that recovers the heat energy of the exhaust gas exhausted from the heat storage type incineration facility that burns and exhausts the harmful gas generated in the vehicle body painting process through heat exchange, and recovers the heat energy from the heat exchanger, Hot water tank providing the necessary heat energy for each tank part of preliminary degreasing, degreasing, and chemical coating step, a heat exchanger that provides heat energy provided from the hot water tank to each water tank part of the vehicle body coating pretreatment process through heat exchange, and an elevated temperature and temperature from the hot water tank. The waste water is recovered through heat exchangers from the tanks in the hot water, pre-degreasing, degreasing, and chemical conversion stages of the body coating pretreatment process, which receives the heat energy required for maintenance, and the heat energy is supplied through heat exchangers connected to each tank portion. It consists of a thermal fluid including general water.

The present invention recovers waste heat from a regenerative incineration facility that burns and discharges toxic gases (VOCs) generated in a car body painting process, and as a heat source for maintaining the temperature and temperature of the water tank required for the pretreatment process of the car body coating. By recycling, energy savings can be achieved, which can greatly contribute to the reduction of operating cost of the body paint pretreatment facility.

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In the heat storage type incineration facility of the automobile painting process which exhausts harmful gas generated in the body painting process by high temperature combustion, it recovers the thermal energy of the exhaust gas which is burned and exhausted at a high temperature. In the pretreatment process of car body painting, which is processed in the steps of 2nd washing-3rd washing-Hwaseong film-4th washing-5th washing-6th washing-Pure water, etc. Iii) The water temperature of the tank part (hereinafter, referred to as each tank part of the body coating pretreatment process) in the step of degreasing and conversion treatment is 40-60 ° C. It is intended to be recycled as a heat source necessary for raising and maintaining
In the exhaust gas stack of the heat storage incineration facility, two control dampers are connected to the start-up of the heat storage incineration facility and the pretreatment process, and the control dampers are recovered in the hot water tank from the hot exhaust gas discharged through the chimney. In addition, the hot water heated by waste heat from the hot water tank is configured to be able to increase the temperature and temperature of the water in the water tank of the hot water, pre-degreasing, degreasing, chemical conversion film stage through a heat exchanger.

    The pre-treatment process of the general body painting process is to wash the foreign body or rust-preventive oil on the surface by spraying and dip method using hot water in the first hot water bath for the body assembled from the car body factory, and then preliminary in the degreasing step following the hot water step In the degreasing tank, washing with degreasing solution added with degreasing agent completely removes residual contaminants.

    The degreasing bath unit removes residual degreasing solution by the object chucking process by spraying and dip method, and then, through the first, second and third washing steps, the car body is prevented from being oxidized and restrained by inhibiting the oxidation of the steel sheet using the surface rough tablet inside the chemical coating tank. For this purpose, the surface adjustment is performed to uniform the properties of the steel plate surface to form a non-conductive phosphate-zinc film on the metal surface, and then the vehicle body is washed secondly by spraying and dipping to remove residual coating liquid. Pure water washing process.

    The present invention recovers waste heat from the high-temperature exhaust gas that is burned and discharged in a regenerative incineration facility that burns and incinerates harmful gases discharged from the vehicle body coating process, and thus, during the pretreatment process of the vehicle body painting process, a hot water washing step and preliminary degreasing and It is configured to recycle as a heat source for maintaining the temperature and temperature of the water required in the degreasing step, the chemical conversion step, looking at the specific details for the implementation of the present invention as follows.

    1 is an overall configuration diagram of a waste heat recovery system of a heat storage incineration plant according to the present invention, Figure 4 is a configuration diagram extracting the essential part of the present invention, Figure 3,4 is a front view and a plan view, extracting the essential part of the present invention 5 is a pipe connection diagram of the heat exchanger connected to the water tank portion of the coating pretreatment process of the present invention.

    The main stack 11 in which the exhaust gas of the heat storage incineration facility 1 is discharged is provided with a separate auxiliary chimney 12 to recover waste heat from the exhaust gas that is burned and exhausted.

    The auxiliary chimney 12 will be formed to be discharged to the outside via the exhaust gas of the combustion high temperature (approximately 200 ° C) through the main chimney 11 to the outside.

    The main chimney 11 is provided with a control damper 14 to control the external discharge of the exhaust gas between the auxiliary chimney 12, the control to control the inflow of the exhaust gas from the main chimney 11 in the auxiliary chimney 12 The dampers 15 are each installed,

    These control dampers 14 and 15 are configured to be interlocked and controlled by the heat storage type incineration plant 1 and the start of the paint pretreatment process, which will be described in detail later.

     A heat exchange chamber 13 for recovering waste heat from the exhaust gas is formed in the auxiliary chimney 12 through which the high temperature exhaust gas is discharged, and the heat exchange chamber 13 includes an exhaust gas discharged through the auxiliary chimney 12. A heat exchanger 4 is installed which directly contacts and recovers waste heat.

    The heat exchanger (4) is a water tank unit 81, 82, 83 of the hot water coating and preliminary degreasing, degreasing, and chemical conversion coating step of the coating process, which requires the temperature and temperature of the water in the vehicle body pretreatment process. 84 is connected to the hot water tank (2) for providing thermal energy to the waste heat energy recovered from the heat exchanger (4) of the auxiliary chimney 12, the exhaust gas is discharged to enable the heating and storage of hot water, 4) allows the recovery of waste heat from the hot exhaust gas by installing a spiral heat exchange pipe or the like in the heat exchange chamber of the auxiliary chimney 12 through which the exhaust gas passes.

    Of course, the heat exchanger 4 that can be composed of the above-mentioned helical heat exchanger pipe, etc. is just one example, and in the present invention, the heat exchanger 4 is not limited to the configuration of the helical heat exchanger pipe. It will be obvious that it can be implemented by various heat exchangers and the means.

    The heat exchanger (4) installed in the heat exchange chamber (13) of the auxiliary chimney (12) has a return line for returning cold water that has undergone heat exchange in the water tanks (81, 82, 83, 84) of the vehicle body coating pretreatment process ( 41 is connected, and an inlet line 42 for receiving hot water that has undergone heat exchange with high temperature thermal energy of the exhaust gas through the hot water tank 2 is connected.

    The hot water tank 2 is provided with a circulation pump 25 for supplying hot water to each of the tanks 81, 82, 83, 84 of the vehicle body pretreatment process, and the supply lines 21, 22, 23 ) 24 are respectively connected to the heat exchangers 51, 52, 53, 54 which are connected to the respective water tanks 81, 82, 83, 84.

   The hot water tank (2) is preferably installed to store the temperature so that the hot water is maintained at 70 ~ 80 ℃, this is hot water, preliminary degreasing, degreasing, because the temperature of each water of the chemical film is about 40 ~ 60 ℃ By storing and supplying hot water at a temperature (70 ~ 80 ℃) to raise the temperature and maintain the temperature, additional facilities required for the high price and complexity of facilities (considering thermal stress, materials, corrosiveness, etc.) and high temperature prevention due to unnecessary high temperature supply That is why it is not required.

    The hot water tank (2) so that when hot water of high temperature flows from the heat exchanger (4) of the auxiliary chimney (12) to supply the adjustment water necessary for temperature control from the outside to maintain the hot water temperature of the above 70 ~ 80 ℃ It would be desirable to have an external water supply (not shown).

    In addition, as already mentioned, the control dampers 14 and 15 installed in the main chimney 11 and the auxiliary chimney 12 are configured to be interlocked and controlled to start the regenerative incineration facility 1 and the pretreatment process. In ordinary cases where waste heat recovery of the gas is required, the control damper 14 of the main chimney 11 is closed and the control damper 15 of the auxiliary chimney 12 is opened so that the exhaust gas is discharged via the auxiliary chimney 12. When the exhaust gas burned from the incineration plant 1 is required to be discharged immediately, or the start of the pretreatment process is stopped, or when the storage hot water of the hot water tank is sufficient, the waste heat recovery of the exhaust gas is not necessary. The control damper 15 on the 12 side is closed and the control damper 14 of the main chimney 11 is opened to immediately discharge the exhaust gas from the incineration plant 1.

     The heat exchangers 81, 82, 83, 84 of each tank unit 81, 82, 83, 84 of the vehicle body pretreatment process are connected to the heat exchanger 4 of the auxiliary chimney 12. Discharge lines 31, 32, 33, 34 for discharging hot water that has been heat-exchanged to the return line 41 are connected to each other,

  Each water tank unit 81, 82, 83, 84 is connected to a heat exchanger 51, 52, 53, 54 with a circulation line 61, 62, 63, 64 and a supply line. The heat energy of the hot water supplied through the (21) (22) (23) and (24) is transferred to each tank unit (81) (82) (83) (84) in the heat exchanger (51) (52) (53) (54). The temperature of the water will be raised and maintained.

     Circulation pumps 7 are installed in the circulation lines 61, 62, 63, and 64, respectively, and heat exchange is connected to supply lines 21, 22, 23, 24 of the hot water tank 2 as follows. It is connected to each of the groups 51, 52, 53, and 54, and the temperature of the water in each of the tanks 81, 82, 83, and 84 is maintained.

    In each tank unit 81, 82, 83, 84 of the vehicle body coating pretreatment process, the hot water tank unit 81 and the degreasing tank unit 83 are connected to the circulation lines 61 and 63 to the heat exchanger 51. (53) is directly connected to the water is heat exchanged directly from the heat exchanger (51) (53) to maintain the temperature, temperature,

    The water tank parts 82 and 84 of the preliminary degreasing and chemical conversion film are connected to the circulation lines 62 and 64 to their respective hot water tanks 82a and 84a to heat up the water of the hot water tanks 82a and 84a. By maintaining the temperature, the water in the water tank parts 82 and 84 of the preliminary degreasing and the chemical conversion film is heated to maintain the temperature.

   The water tanks 82 and 84 of the preliminary degreasing and chemical conversion film are heated by the hot water tanks 82a and 84a by the use of a degreasing agent, a surface composition agent, etc., and the hot water tank 82a in the vehicle body coating pretreatment process. The water tanks 82 and 84 of the preliminary degreasing and the chemical conversion film are connected to the 84a, and the present invention is common, and the present invention provides a hot water tank connected to the water tank parts 82 and 84 of the preliminary degreasing and chemical conversion film. The water of 82a) and 84a is heated up and maintained at temperature.

   On the other hand, in the above water tanks 81, 82, 83, 84, the steam supply system such as an existing heater for raising the temperature and maintaining the temperature is installed as it is and the waste heat recovered from the incineration facility by interlocking with the system of the present invention. When the heat energy supply is interrupted or insufficient, it can be operated as a heater as before,

    Each of the tanks 81, 82, 83, and 84 has a temperature of 40 to 60 ° C., and their setting / maintenance temperatures are different, so that the tanks 81, 82, 83, and 84 have different heat exchangers 51, 52, 53, and 54, respectively. To control the temperature and temperature

 In the case where the heat source is insufficient for the temperature raising and temperature holding using the heat exchanger (51) (52) (53) (54), it is possible to operate the steam supply system such as a heater and the like by interlocking and bypass automatic control. Control to maintain temperature.

   In addition, each of the supply lines 21, 22, 23, 24, discharge lines 31, 32, 33, 34, circulation lines 61, 62, 63, 64, The recovery line 41 and the inlet line 42 are provided with a temperature measuring instrument (thermometer), and the heat exchangers 51, 52, 53 and 54 of the respective tank sections 81, 82, 83 and 84 are provided. Supply lines 21, 22, 23, 24 and discharge lines 31, 32, 33, 34 and circulation lines 61, 62, 63, 64 connected to the auxiliary line (91) (92) (93) (94) are connected to each other and a flow path switching valve (3way v / v) 10 is installed therein to provide hot water dehydrated in the hot water tank 2 and each tank part of the pretreatment process ( The water of 81, 82, 83 and 84 can be supplied and maintained at a constant temperature.

    That is, the auxiliary line (91) (92) (93) (94) and the flow path switching valve (10) is a supply line necessary for maintaining the temperature and temperature of the water tanks (81, 82, 83, 84). Each of the fresh water and the pretreatment process of the hot water tank 2 by supplying hot water directly from the (21) (22) (23) (24) to the circulation lines (61) (62) (63) (64). The water of the tanks 81, 82, 83, 84 is supplied and maintained at a constant temperature by using the heat exchangers 51, 52, 53, 54 and the flow path switching valve 10.

   Meanwhile, the supply lines 21, 22, 23, 24, the heat exchangers 51, 52, 53, 54 and the recovery line 41, the heat exchanger 4, from the hot water tank 2, The hot water circulating to the hot water tank 2 through the inlet line 42 to recover the waste heat of the exhaust gas from the heat exchanger 4 of the auxiliary chimney 12 may be performed with various thermal fluids including general water.

   1 is an overall configuration of the waste heat recovery system of the heat storage incineration facility according to the present invention

   Figure 2 is a block diagram extracting the essential part of the present invention

   3 and 4 are a front view and a plan view of a part of the present invention;

   5 is a pipe connection diagram of the heat exchanger connected to the water tank of the pretreatment process of the present invention

☞ Explanation of the main symbols used in the main part of the drawing ☜

1: Regenerative Incineration Facility 2: Hot Water Tank

21,22,23,24: supply line 31,32,33,34: discharge line

4: heat exchanger 41: return line

42: inlet line 51, 52, 53, 54: heat exchanger

61, 62, 63, 64: circulation line 7: circulation pump

91,92,93,94: auxiliary line 10: flow path switching valve

Claims (5)

A heat exchanger for recovering heat energy of exhaust gas exhausted from a heat storage type incineration facility that burns and exhausts harmful gases generated in a vehicle body painting process through heat exchange; By recovering the heat energy from the heat exchanger to provide the heat energy required for each tank in the hot water, pre-degreasing, degreasing, and chemical coating step of the vehicle body coating pretreatment process Hot water tank, Temperature raising and temperature maintenance of the body coating pre-treatment process water tank unit, characterized in that each of the water tank through the step of hot water, pre-degreasing, degreasing, chemical conversion of the body coating pre-treatment process is provided for the temperature and temperature maintenance from the hot water tank Heat recovery system of regenerative incineration plant.      In order to recover the waste heat from the exhaust gas in the main stack of the heat storage incinerator of the body painting process, a heat exchanger for recovering the waste heat of the exhaust gas is installed in the auxiliary chimney where the exhaust gas is discharged.     The heat exchanger is supplied to each tank through hot water, preliminary degreasing, degreasing, and chemical conversion in the car body coating pretreatment process, which requires water temperature and temperature maintenance. It is connected to the hot water tank that provides thermal energy by in line with the inlet line,    The hot water tank is connected to each heat exchanger connected to each water tank unit and a circulation line by a supply line to provide thermal energy to each water tank unit of the vehicle body coating pretreatment process through each heat exchanger.     Each heat exchanger is a waste heat recovery system of a heat storage type incineration facility for maintaining the temperature and temperature of the body paint pretreatment process tank, characterized in that the heat exchanger connected to the discharge line connected to the heat exchanger connected to the auxiliary chimney.     The method of claim 2,     The main chimney is provided with a control damper to control the discharge of the exhaust gas, the auxiliary chimney connected to the main chimney is installed a control damper for controlling the inflow of exhaust gas from the main chimney characterized in that the body coating pre-treatment process Waste heat recovery system of heat storage type incineration facility to maintain the temperature and temperature of tank. The method of claim 2,   The circulation line of each water tank unit and the supply line of the hot water tank and the discharge line of each heat exchanger are connected to each other by an auxiliary line, and the auxiliary line has a flow path switching valve installed therein. And heat recovery system of heat storage incinerator for temperature maintenance. The method according to claim 1 or 2, Waste heat recovery of the exhaust gas exhausted from the heat storage type incineration facility and heat exchange for providing thermal energy of each tank part are for heating and maintaining the temperature of the body part pre-treatment tank part of the vehicle body pretreatment process, characterized in that it consists of thermal fluid including general water. Waste heat recovery system of regenerative incineration facility.

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