RTO waste heat recovery system for automotive factory painting workshops

Abstract

This application relates to a system for RTO waste heat recovery in automotive factory painting workshops, belonging to the field of waste heat recovery technology. It includes an induced draft fan assembly, a waste heat collection assembly, a waste heat transfer assembly, and a waste heat utilization assembly. This application enhances the sealing between the induced draft fan and the RTO exhaust outlet through duct connectors, reducing high-temperature flue gas leakage and improving the integrity of waste heat collection. Rock wool is used as the insulation component for the waste heat collection box, effectively reducing heat loss. The honeycomb holes of the hollow copper pillars and the spiral heat exchange tubes improve heat exchange efficiency, solving the problem of low recovery efficiency in existing technologies. Positioning holes facilitate quick positioning and installation of the base plate. The replenishment and drain pipes of the heat storage tank, combined with the first valve, simplify the medium replenishment and replacement process, reducing maintenance difficulty and cost. Pipe connectors connect multiple heat utilization branches, and the second valve enables independent control of each branch, flexibly adapting to scenarios such as workshop heating and hot water supply.

Description

Technical Field

[0001] This application relates to the field of waste heat recovery technology, and in particular to a system for RTO waste heat recovery in automotive factory painting workshops. Background Technology

[0002] In the painting workshop of an automobile factory, the RTO (Regenerative Thermal Oxidizer) is a key piece of equipment for treating volatile organic compounds (VOCs). It decomposes VOCs into harmless carbon dioxide and water through high-temperature oxidation, generating a large amount of waste heat in the process. Currently, most automobile factory painting workshops have a low utilization rate of the waste heat generated by RTO (Regenerative Thermal Oxidizer), and a large amount of high-temperature flue gas is directly emitted into the atmosphere, which not only causes serious energy waste, but also causes thermal pollution to the surrounding environment.

[0003] Existing waste heat recovery methods either have low recovery efficiency, only recovering a small amount of waste heat; or the recovered heat is difficult to find suitable application scenarios in the workshop, resulting in poor practicality of the waste heat recovery system; and some systems have complex structures and high maintenance costs, which are not conducive to promotion and application in automotive factory painting workshops. Utility Model Content

[0004] The purpose of this application is to provide a system for RTO waste heat recovery in automotive factory painting workshops, which optimizes the process and quality of waste heat recovery and solves the problems mentioned in the background art.

[0005] The system for RTO waste heat recovery in an automotive factory painting workshop provided in this application adopts the following technical solution: The system for RTO waste heat recovery in an automotive factory painting workshop includes an exhaust fan assembly, a waste heat collection assembly, a waste heat transfer assembly, and a waste heat utilization assembly. The exhaust fan assembly includes an exhaust fan installed at the RTO exhaust port, and the output end of the exhaust fan is connected to a flue gas duct. The waste heat collection assembly includes a base plate and a waste heat collection box fixedly connected to the upper surface of the base plate. Two flow equalization mesh plates are fixedly connected inside the waste heat collection box, and a hollow copper column is installed between the two flow equalization mesh plates. The hollow copper column has uniformly distributed honeycomb holes inside, and a spiral heat exchange tube is installed inside the waste heat collection box.

[0006] The waste heat transfer assembly includes a heat storage tank fixedly connected to the upper surface of the base plate. Two staggered circulating water pumps are installed on the outer surface of the heat storage tank. The ends of the two circulating water pumps that are close to each other are connected to the interior of the heat storage tank, and the ends of the two circulating water pumps that are far apart from each other are respectively connected to a first heat-insulating circulation pipe and a second heat-insulating circulation pipe. One end of the first heat-insulating circulation pipe and the second heat-insulating circulation pipe are respectively connected to the two ends of a spiral heat exchange tube. A temperature sensor is installed on the inner bottom wall of the heat storage tank.

[0007] By adopting the above technical solution, the induced draft assembly stably introduces the high-temperature flue gas generated by the RTO into the waste heat collection assembly through the induced draft fan and flue gas duct. The two flow equalization mesh plates in the waste heat collection box can make the flue gas flow evenly through the hollow copper column. In conjunction with the honeycomb holes on the hollow copper column, the contact area between the flue gas and the spiral heat exchange tube is increased, thereby improving the heat exchange efficiency. In the waste heat transfer assembly, the heat storage tank forms a closed loop with the spiral heat exchange tube through two staggered circulating water pumps and the first and second insulated circulating pipes, ensuring efficient heat transfer. The temperature sensor on the inner bottom wall can monitor the heat storage status in real time. The overall structural design is reasonable, which solves the problems of low waste heat recovery efficiency and complex structure in the existing technology, and improves the practicality and stability of the system.

[0008] Preferably, the input end of the induced draft fan is equipped with a duct connector, which is fixedly connected to the smoke exhaust port of the RTO.

[0009] By adopting the above technical solution, the input end of the induced draft fan is fixedly connected to the RTO exhaust port through the duct connector, which can enhance the sealing of the connection, reduce the leakage of high-temperature flue gas during the introduction process, improve the integrity of waste heat collection, avoid waste heat waste caused by flue gas loss, and solve the problem of low waste heat recovery efficiency in the existing technology.

[0010] Preferably, the output end of the waste heat collection box is connected to an external drain pipe, and a filter is installed at the output end of the external drain pipe.

[0011] By adopting the above technical solution, a filter is installed at the end of the exhaust pipe at the output end of the waste heat collection box, which can purify the flue gas after heat exchange, reduce the pollution of the surrounding environment caused by the directly emitted flue gas, and at the same time reduce the heat emission of high-temperature flue gas in conjunction with waste heat recovery, thus alleviating the thermal pollution problem caused by the direct emission of high-temperature flue gas in the existing technology.

[0012] Preferably, the inner wall of the waste heat collection box is fixedly connected with an insulation layer, which is made of rock wool.

[0013] By adopting the above technical solution, the insulation layer of the inner wall of the waste heat collection box is made of rock wool, which can effectively prevent the heat inside the box from being lost to the outside, reduce the loss of waste heat in the collection process, improve the overall waste heat recovery efficiency, and solve the problem of low recovery efficiency caused by heat loss in the existing technology.

[0014] Preferably, positioning holes are provided at all four corners of the base plate.

[0015] By adopting the above technical solution, the positioning holes at the corners of the base plate facilitate the overall installation and fixation of the system, enabling quick positioning and connection with the workshop's basic structure, simplifying the installation process, reducing installation difficulty, and solving the problem of inconvenient installation and maintenance caused by the complex system structure in the existing technology.

[0016] Preferably, the top of the heat storage tank is connected to a replenishment pipe, the bottom of the heat storage tank is connected to a drain pipe, and a first valve is installed on a section of the drain pipe.

[0017] By adopting the above technical solution, the replenishment pipe at the top of the thermal storage tank can conveniently and timely replenish the circulating medium, and the drain pipe at the bottom, together with the first valve, can conveniently discharge the aged or deteriorated medium, which facilitates the daily maintenance and medium replacement of the system, reduces maintenance costs, and solves the problem of high maintenance costs in the existing technology.

[0018] Preferably, the waste heat utilization component includes a pipe connector installed outside the heat storage tank, the interior of the pipe connector being connected to the interior of the heat storage tank, and multiple heat utilization branches being installed inside the pipe connector.

[0019] By adopting the above technical solution, the waste heat utilization component connects multiple heat utilization branches to the heat storage tank through pipeline connectors, which can expand to various heat use scenarios according to the actual needs of the workshop, such as heating and hot water supply, so that the recovered waste heat can match the specific application needs of the workshop, and solve the problem that it is difficult to find suitable application scenarios for recovered heat in the existing technology.

[0020] Preferably, the input ends of the plurality of heat utilization branches are all connected to the interior of the heat storage tank through pipe connectors, and a second valve is installed on the pipe sections of the plurality of heat utilization branches.

[0021] By adopting the above technical solution, multiple heat utilization branches are connected to the heat storage tank through pipeline connectors, and the second valve on each branch pipe section can independently control the opening and closing of the branch, which can flexibly adjust the heat distribution, adapt to the heat demand under different working conditions, improve the practicality of the system, and solve the problem of the poor practicality of the waste heat recovery system in the existing technology.

[0022] In summary, this application includes at least one of the following beneficial technical effects: This system for RTO waste heat recovery in an automotive factory painting workshop enhances the sealing between the induced draft fan and the RTO exhaust port through duct connectors, reducing high-temperature flue gas leakage and improving the integrity of waste heat collection. Rock wool is used as the insulation component for the waste heat collection box, effectively reducing heat loss. The honeycomb holes of the hollow copper pillars and spiral heat exchange tubes improve heat exchange efficiency, addressing the low recovery efficiency problem of existing technologies. Positioning holes facilitate quick installation of the base plate. The replenishment and drain pipes of the heat storage tank, along with the first valve, simplify the media replenishment and replacement process, reducing maintenance difficulty and cost. Pipe connectors connect multiple heat utilization branches, and the second valve enables independent control of each branch. This allows for flexible adaptation to workshop heating, hot water supply, and other scenarios, solving the problems of poor compatibility with heat recovery application scenarios and limited system practicality, thus optimizing the overall waste heat recovery process and quality. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall front view structure of this application; Figure 2 This is a top view of the overall structure of this application; Figure 3 This is a schematic diagram of the overall sectional planar structure of this application; Figure 4 This is a schematic diagram of the first overall cross-sectional top view of the structure of this application; Figure 5 This is a top view of the second overall cross-section structure of this application.

[0024] In the picture: 1. Exhaust fan assembly; 101. Exhaust fan; 102. Flue gas duct; 103. Duct connector; 104. Exhaust pipe; 105. Filter; 2. Waste heat collection assembly; 201. Base plate; 202. Waste heat collection box; 203. Insulation layer; 204. Flow equalization mesh plate; 205. Hollow copper column; 206. Honeycomb holes; 207. Spiral heat exchange tube; 208. Positioning hole; 3. Waste heat transfer assembly; 301. Heat storage tank; 302. Circulating water pump; 303. First insulated circulation pipe; 304. Second insulated circulation pipe; 305. Temperature sensor; 306. Liquid replenishment pipe; 307. Liquid drain pipe; 308. First valve; 4. Waste heat utilization assembly; 401. Pipe connector; 402. Heat utilization branch; 403. Second valve. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1 - Appendix Figure 5 This application will be described in further detail below.

[0026] Example 1: A system for RTO waste heat recovery in an automotive factory painting workshop, referring to... Figure 2 , Figure 3 and Figure 5The system includes an exhaust fan assembly 1, a waste heat collection assembly 2, a waste heat transfer assembly 3, and a waste heat utilization assembly 4. The exhaust fan assembly 1 includes an exhaust fan 101 installed at the RTO exhaust port, with its output end connected to a flue gas duct 102. The waste heat collection assembly 2 includes a base plate 201 and a waste heat collection box 202 fixedly connected to the upper surface of the base plate 201. Two flow equalization mesh plates 204 are fixedly connected inside the waste heat collection box 202, and a hollow copper column 205 is installed between the two flow equalization mesh plates 204. The hollow copper column 205 has evenly distributed honeycomb holes 206 inside. The waste heat collection box 202 is equipped with… The spiral heat exchange tube 207 and the waste heat transfer assembly 3 include a heat storage tank 301 fixedly connected to the upper surface of the base plate 201. Two staggered circulating water pumps 302 are installed on the outer surface of the heat storage tank 301. The ends of the two circulating water pumps 302 that are close to each other are connected to the interior of the heat storage tank 301. The ends of the two circulating water pumps 302 that are far apart from each other are respectively connected to a first heat-insulating circulating pipe 303 and a second heat-insulating circulating pipe 304. One end of the first heat-insulating circulating pipe 303 and the second heat-insulating circulating pipe 304 are respectively connected to the two ends of the spiral heat exchange tube 207. A temperature sensor 305 is installed on the inner bottom wall of the heat storage tank 301.

[0027] Reference Figure 1 , Figure 4 and Figure 5 The waste heat utilization component 4 includes a pipe connector 401 installed outside the heat storage tank 301. The interior of the pipe connector 401 is connected to the interior of the heat storage tank 301. Multiple heat utilization branches 402 are installed inside the pipe connector 401. The waste heat utilization component 4 connects the multiple heat utilization branches 402 to the heat storage tank 301 through the pipe connector 401. It can expand to various heat use scenarios according to the actual needs of the workshop, such as heating and hot water supply, so that the recovered waste heat can match the specific application needs of the workshop, solving the problem that it is difficult to find suitable applications for recovered heat in the existing technology. To address the issue of the scenario, the input ends of multiple heat utilization branches 402 are all connected to the interior of the heat storage tank 301 via pipe connectors 401. Each section of the multiple heat utilization branches 402 is equipped with a second valve 403. The multiple heat utilization branches 402 are connected to the heat storage tank 301 via pipe connectors 401, and the second valve 403 on each branch section can independently control the opening and closing of the branch. This allows for flexible adjustment of heat distribution, adapting to the heat demand under different working conditions, improving the system's practicality, and solving the problem of the limited practicality of waste heat recovery systems in the prior art.

[0028] Example 2: A system for RTO waste heat recovery in an automotive factory painting workshop, referring to... Figure 1 , Figure 2 and Figure 3Based on the same concept as Embodiment 1 above, this embodiment proposes that the input end of the induced draft fan 101 is equipped with a duct connector 103, which is fixedly connected to the exhaust port of the RTO. The input end of the induced draft fan 101 is fixedly connected to the exhaust port of the RTO through the duct connector 103, which can enhance the sealing of the connection, reduce the leakage of high-temperature flue gas during the introduction process, improve the integrity of waste heat collection, avoid waste heat waste caused by flue gas loss, and solve the problem of low waste heat recovery efficiency in the prior art. The output end of the waste heat collection box 202 is connected to an external exhaust pipe 104, and a filter 105 is installed at the output end of the external exhaust pipe 104. The filter 105 at the end of the external exhaust pipe 104 at the output end of the waste heat collection box 202 can purify the flue gas after heat exchange, reduce the pollution of the surrounding environment caused by the directly emitted flue gas, and at the same time reduce the heat emission of high-temperature flue gas in conjunction with waste heat recovery, thus alleviating the heat pollution problem caused by the direct emission of high-temperature flue gas in the prior art.

[0029] Reference Figure 3 , Figure 4 and Figure 5 The inner wall of the waste heat collection box 202 is fixedly connected with an insulation layer 203, which is made of rock wool. The use of rock wool in the insulation layer 203 effectively prevents heat loss from the box to the outside, reducing heat loss during collection and improving overall waste heat recovery efficiency. This solves the problem of low recovery efficiency due to heat loss in existing technologies. Positioning holes 208 are provided at the four corners of the base plate 201. These holes facilitate the overall installation and fixing of the system, allowing for quick and easy connection to the workshop's foundation structure. The simplified installation process reduces installation difficulty and solves the problem of inconvenient installation and maintenance caused by the complex system structure in existing technologies. The top of the heat storage tank 301 is connected to a replenishment pipe 306, and the bottom is connected to a drain pipe 307. A first valve 308 is installed on a section of the drain pipe 307. The replenishment pipe 306 at the top of the heat storage tank 301 facilitates timely replenishment of the circulating medium, while the drain pipe 307 at the bottom, in conjunction with the first valve 308, allows for convenient discharge of aged or deteriorated media. This facilitates daily system maintenance and media replacement, reduces maintenance costs, and solves the problem of high maintenance costs in existing technologies. The implementation principle of this application embodiment is as follows: First, the induced draft fan 101 in the induced draft assembly 1 draws high-temperature flue gas from the RTO exhaust port. The flue gas enters the flue gas duct 102 through the duct connector 103 and is stably transported to the waste heat collection box 202 of the waste heat collection assembly 2. The high-temperature flue gas entering the waste heat collection box 202 first passes through the flow equalization mesh plate 204 on one side. The flow equalization mesh plate 204 disperses the flue gas into a uniform airflow, allowing it to flow smoothly through the hollow copper column 205 between the two flow equalization mesh plates 204. The honeycomb holes 206 inside the hollow copper column 205 further increase the flow path of the flue gas and the contact area with the surrounding environment, so that the heat in the flue gas can be more fully transferred to the spiral heat exchange tube 207 that runs through the waste heat collection box 202. The circulating medium in the spiral heat exchange tube 207 absorbs heat and its temperature rises. The flue gas after heat exchange is regulated by the flow equalization mesh plate 204 on the other side, and finally discharged after being purified by the exhaust pipe 104 and the filter 105 at the end, reducing pollution to the environment. Meanwhile, the circulating water pump 302 in the waste heat transfer component 3 starts, transporting the high-temperature circulating medium that has absorbed heat in the spiral heat exchange tube 207 to the heat storage tank 301 through the second insulated circulating pipe 304. The temperature sensor 305 on the bottom wall of the heat storage tank 301 monitors the medium temperature in real time to ensure that the heat storage status is controllable. When heat needs to be utilized, the high-temperature medium in the heat storage tank 301, driven by the circulating water pump 302, flows back to the spiral heat exchange tube 207 through the first insulated circulating pipe 303, forming a closed loop. Finally, the heat in the heat storage tank 301 is distributed to multiple heat utilization branches 402 of the waste heat utilization component 4 through the pipe connector 401. The second valve 403 of each branch can be individually controlled to open and close according to the actual needs of the workshop, such as heating and hot water supply, so that the recovered waste heat is precisely matched to the heat use scenario of the workshop, completing the complete process from waste heat collection, transfer, storage to utilization, and realizing the efficient recovery and rational utilization of RTO waste heat.

Claims

1. A system for RTO waste heat recovery in automotive factory painting workshop, comprising an air induction assembly (1), a waste heat collection assembly (2), a waste heat transfer assembly (3) and a waste heat utilization assembly (4), characterized in that: The exhaust fan assembly (1) includes an exhaust fan (101) installed at the RTO exhaust port. The exhaust fan (101) is connected to a flue gas duct (102). The waste heat collection assembly (2) includes a base plate (201) and a waste heat collection box (202) fixedly connected to the upper surface of the base plate (201). Two flow equalization mesh plates (204) are fixedly connected inside the waste heat collection box (202). A hollow copper column (205) is installed between the two flow equalization mesh plates (204). The hollow copper column (205) has uniformly distributed honeycomb holes (206) inside. A spiral heat exchange tube (207) is installed inside the waste heat collection box (202). The waste heat transfer assembly (3) includes a heat storage tank (301) fixedly connected to the upper surface of the base plate (201). Two staggered circulating water pumps (302) are installed on the outer surface of the heat storage tank (301). The ends of the two circulating water pumps (302) that are close to each other are connected to the interior of the heat storage tank (301). The ends of the two circulating water pumps (302) that are far apart from each other are respectively connected to a first heat-insulating circulating pipe (303) and a second heat-insulating circulating pipe (304). One end of the first heat-insulating circulating pipe (303) and the second heat-insulating circulating pipe (304) are respectively connected to both ends of the spiral heat exchange tube (207). A temperature sensor (305) is installed on the inner bottom wall of the heat storage tank (301).

2. The system for RTO waste heat recovery in automotive plant paint shop as claimed in claim 1 wherein: The input end of the induced draft fan (101) is equipped with a duct connector (103), which is fixedly connected to the smoke exhaust port of the RTO.

3. The system for RTO waste heat recovery in automotive plant paint shop as claimed in claim 1 wherein: The output end of the waste heat collection box (202) is connected to an external drain pipe (104), and a filter (105) is installed at the output end of the external drain pipe (104).

4. The system for RTO waste heat recovery in automotive plant paint shop as claimed in claim 1 wherein: The inner wall of the waste heat collection box (202) is fixedly connected with an insulation layer (203), which is made of rock wool material.

5. The system for RTO waste heat recovery in automotive plant paint shop as claimed in claim 1 wherein: Positioning holes (208) are provided at all four corners of the base plate (201).

6. The system for RTO waste heat recovery in automotive plant paint shop as claimed in claim 1 wherein: The top of the heat storage tank (301) is connected to a replenishment pipe (306), and the bottom of the heat storage tank (301) is connected to a drain pipe (307). A first valve (308) is installed on the pipe section of the drain pipe (307).

7. The system for RTO waste heat recovery in automotive plant paint shop as claimed in claim 1 wherein: The waste heat utilization component (4) includes a pipe connector (401) installed outside the heat storage tank (301), the inside of the pipe connector (401) is connected to the inside of the heat storage tank (301), and multiple heat utilization branches (402) are installed inside the pipe connector (401).

8. The system for RTO waste heat recovery in automotive plant paint shop as claimed in claim 7 wherein: The input ends of the multiple heat utilization branches (402) are connected to the interior of the heat storage tank (301) through the pipe connector (401), and a second valve (403) is installed on the pipe section of the multiple heat utilization branches (402).

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