A paint stripping furnace waste heat utilization system
By designing a waste heat utilization system for the paint removal furnace, and using flue gas heat exchangers and waste heat utilization equipment to recover the heat of high-temperature flue gas, solving the problem of energy consumption of high-temperature flue gas in the existing technology, achieving efficient utilization and stable operation, with significant economic and environmental benefits.
Patent Information
- Application Number
- CN202421440023.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-21
- Publication Date
- 2025-04-04
- Estimated Expiration
- 2034-06-21
AI Technical Summary
The prior art requires a large amount of energy to cool down when dealing with high-temperature flue gas of paint decoupling furnaces, which increases system complexity and maintenance costs, and it is difficult to effectively recover and utilize waste heat in the flue gas.
A waste heat utilization system for paint dehumidifiers is designed, including paint dehumidifiers, flue gas heat exchangers, waste heat utilization equipment, cooling towers and emergency heat exchangers. The high-temperature flue gas heat is transferred to the high-temperature medium through the flue gas heat exchanger, and the energy recovery and reuse is realized through the waste heat utilization equipment. The emergency heat exchanger ensures that the system can still operate stably when the waste heat utilization equipment fails.
It realizes efficient utilization of high-temperature flue gas in the paint-de-painted furnace, reduces energy consumption and treatment costs, ensures stable operation of the system and heat balance, and has significant economic benefits and environmental significance.
Smart Images
Figure CN222718699U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a paint stripping furnace waste heat utilization system and belongs to the technical field of refrigeration equipment. Background Art
[0002] In current industrial applications, paint stripping furnaces are important processing equipment and are widely used in the paint removal process of various painted surfaces. However, paint stripping furnaces produce a large amount of high-temperature flue gas when working, and its temperature is usually over 600°C. Before being discharged, these high-temperature flue gases must undergo a strict environmental protection treatment process, including desulfurization, dust removal, denitrification and other deep treatment steps to ensure that the emission of various non-environmentally friendly components meets relevant standards and requirements.
[0003] However, when existing technologies are used to treat these high-temperature flue gases, the flue gases must be cooled to below 200°C before being discharged to meet the treatment conditions. In order to cool the high-temperature flue gases to the temperature range required for treatment, cooling equipment such as cooling towers and cooling water circulation systems are required. These equipment not only increase the complexity and maintenance costs of the system, but also consume additional energy, further increasing the treatment cost.
[0004] Therefore, how to effectively recover and utilize the waste heat in the flue gas of the paint stripping furnace while reducing the processing cost has become a technical problem that needs to be solved urgently. Utility Model Content
[0005] The purpose of the utility model is to provide a new technical solution to improve or solve the technical problems existing in the prior art as described above.
[0006] The technical solution provided by the utility model is as follows: a paint stripping furnace waste heat utilization system, comprising a paint stripping furnace, a flue gas heat exchanger, waste heat utilization equipment, a cooling tower and an emergency heat exchanger, the high-temperature flue gas outlet of the paint stripping furnace is connected to the flue gas duct inlet of the flue gas heat exchanger, the flue gas heat exchanger and the waste heat utilization equipment are connected through a first heat exchange circulation pipeline, the cooling tower and the waste heat utilization equipment are connected through a second heat exchange circulation pipeline, the first heat exchange circulation pipeline comprises a low-temperature side return liquid pipe and a high-temperature side supply liquid pipe, the low-temperature side return liquid pipe is used to transport the low-temperature medium in the waste heat utilization equipment to the flue gas heat exchanger for heat exchange and heating, the high-temperature side supply liquid pipe is used to transport the heated high-temperature medium to the waste heat utilization equipment, and the emergency heat exchanger is connected in parallel or in series with the waste heat utilization equipment.
[0007] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects: the paint stripping furnace waste heat utilization system of the utility model realizes the efficient utilization of the high-temperature flue gas generated by the paint stripping furnace. First, when the high-temperature flue gas (usually exceeding 600°C) generated by the paint stripping furnace passes through the flue gas heat exchanger, its heat can be transferred to the high-temperature medium (such as hot water, steam, heat transfer oil, etc.), so that the flue gas temperature is reduced to below 200°C, meeting the requirements of subsequent desulfurization, denitrification, dust removal and other processes. At the same time, these heated high-temperature media can be used as driving energy to supply waste heat utilization equipment, realizing energy recovery and reuse. The emergency heat exchanger is connected to the system in parallel or in series. If the temperature of the medium flowing through the low-temperature side return pipe is too high, it can first enter the emergency heat exchanger through the third heat exchange circulation pipeline. In the emergency heat exchanger, these high-temperature media will further reduce the temperature, and then return to the flue gas heat exchanger through the low-temperature side return pipe, ensuring that the medium can reach the appropriate temperature range before entering the flue gas heat exchanger, ensuring the cooling effect of the flue gas. The cooling tower can not only provide cooling medium for the emergency heat exchanger, but also help reduce the temperature of the waste heat utilization equipment to ensure the avoidance of potential safety hazards. Therefore, even if the waste heat utilization equipment fails or needs maintenance, the system can still rely on the cooling tower and the emergency heat exchanger to exchange and utilize heat, ensuring the stable operation of the system.
[0008] On the basis of the above technical solution, the present invention can also be improved as follows.
[0009] Furthermore, a heat source circulation pump is provided on the high-temperature side liquid supply pipe.
[0010] The beneficial effect of adopting the above further solution is that a heat source circulation pump is provided on the high-temperature side liquid supply pipe, which can ensure the stable circulation flow of the high-temperature medium in the system, thereby improving the efficiency and stability of heat transfer.
[0011] Furthermore, the low-temperature side liquid return pipe and the high-temperature side liquid supply pipe are connected via a bypass pipeline, and a converging three-way valve is provided between the low-temperature side liquid return pipe and the bypass pipeline.
[0012] The beneficial effect of adopting the above-mentioned further scheme is that by setting the bypass pipeline and the converging three-way valve, the waste heat utilization system can flexibly adjust the medium flow and temperature in the heat exchange process according to actual needs. When the waste heat utilization equipment needs a medium with more heat, the converging three-way valve can be adjusted to reduce the amount of medium flowing through the bypass pipeline, so that more high-temperature medium can enter the waste heat utilization equipment through the high-temperature side liquid supply pipe. Conversely, when the waste heat utilization equipment does not need a medium with too much heat, the amount of medium flowing through the bypass pipeline can be increased, so that part of the high-temperature medium can flow directly back to the low-temperature side return pipe through the bypass pipeline, thereby achieving the purpose of regulating the medium temperature and flow.
[0013] Furthermore, the emergency heat exchanger is connected to the low-temperature side return pipe through a third heat exchange circulation pipeline, and the emergency heat exchanger is connected to the second heat exchange circulation pipeline through a fourth heat exchange circulation pipeline. A diverter three-way valve is provided between the low-temperature side return pipe and the third heat exchange circulation pipeline.
[0014] The beneficial effect of adopting the above further solution is that the flow rate of the medium flowing from the low-temperature return water pipe into the emergency heat exchanger can be flexibly regulated according to needs through the diversion three-way valve.
[0015] Furthermore, a cooling water circulation pump is also provided on the second heat exchange circulation pipeline, and the cooling water circulation pump is used to pump the coolant in the cooling tower into the waste heat utilization equipment.
[0016] Furthermore, a thermometer is provided on the low-temperature side liquid return pipe.
[0017] The beneficial effect of adopting the above further solution is that the thermometer can monitor the temperature of the medium in the low-temperature side return pipe in real time, ensuring that the medium can reach a suitable temperature range before entering the flue gas heat exchanger, thereby ensuring the cooling effect of the flue gas.
[0018] Furthermore, the waste heat utilization equipment is one or more of a lithium bromide chiller, a waste heat power generation device, a second type absorption heat pump, an absorption ammonia refrigerator, a water vapor compressor, a hybrid machine, and a heat exchanger.
[0019] The beneficial effect of adopting the above further scheme is that these devices can convert the heat in the high-temperature flue gas generated by the paint stripping furnace into different forms of energy, such as cold water, hot water or electricity, etc., to meet the energy needs of different processes in industrial production.
[0020] Furthermore, it also includes a flue gas deep processing device, and the flue gas duct outlet of the flue gas heat exchanger is connected to the flue gas deep processing device.
[0021] Furthermore, a first flow control valve is provided at the inlet of the flue gas duct.
[0022] The beneficial effect of adopting the above further solution is that the first flow control valve can accurately control the flue gas flow entering the flue gas heat exchanger, ensuring that the system can adjust the heat exchange efficiency according to actual needs.
[0023] Furthermore, a second flow control valve is provided at the outlet of the flue gas duct.
[0024] The beneficial effect of adopting the above further solution is that when the first flow control valve fails or needs maintenance, the second control valve can be used as a backup to ensure that the system continues to operate stably. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.
[0026] Figure 1 It is a structural schematic diagram of the paint stripping furnace waste heat utilization system of the utility model;
[0027] In the figure, 1. paint stripping furnace; 2. flue gas heat exchanger; 3. waste heat utilization equipment; 4. cooling tower; 5. emergency heat exchanger; 6. first heat exchange circulation pipeline; 61. low-temperature side return pipe; 62. high-temperature side supply pipe; 7. second heat exchange circulation pipeline; 8. heat source circulation pump; 9. bypass pipeline; 10. converging three-way valve; 11. diverting three-way valve; 12. cooling water circulation pump; 13. thermometer; 14. third heat exchange circulation pipeline; 15. first flow control valve; 16. second flow control valve; 17. fourth heat exchange circulation pipeline. DETAILED DESCRIPTION
[0028] The principles and features of the present invention are described below in conjunction with examples. The examples are only used to explain the present invention and are not used to limit the scope of the present invention.
[0029] like Figure 1 As shown, a paint stripping furnace waste heat utilization system is characterized in that it includes a paint stripping furnace 1, a flue gas heat exchanger 2, a waste heat utilization device 3, a cooling tower 4 and an emergency heat exchanger 5, the high-temperature flue gas outlet of the paint stripping furnace 1 is connected to the flue gas pipe inlet of the flue gas heat exchanger 2, the flue gas pipe outlet of the flue gas heat exchanger 2 is connected to the flue gas deep treatment equipment, the flue gas heat exchanger 2 is connected to the waste heat utilization device 3 through a first heat exchange circulation pipeline 6, the cooling tower 4 is connected to the waste heat utilization device 3 through a second heat exchange circulation pipeline 7, the first heat exchange circulation pipeline 6 includes a low-temperature side return liquid pipe 61 and a high-temperature side supply liquid pipe 62, the low-temperature side return liquid pipe is used to transport the low-temperature medium in the waste heat utilization device 3 to the flue gas heat exchanger 2, and exchange heat with the high-temperature flue gas to heat the medium, so as to heat the medium, and the high-temperature side supply liquid pipe 62 then transports the high-temperature medium after heat exchange and heating back to the waste heat utilization device 3, and the emergency heat exchanger 5 is connected in parallel or in series with the waste heat utilization device 3.
[0030] The heat source circulation pump 8 is arranged on the high-temperature side liquid supply pipe 62 to ensure the stable circulation flow of the high-temperature medium in the system, thereby improving the efficiency and stability of heat transfer.
[0031] The low-temperature side liquid return pipe 61 and the high-temperature side liquid supply pipe 62 are connected via a bypass pipeline 9 , and a converging three-way valve 10 is provided between the low-temperature side liquid return pipe 61 and the bypass pipeline 9 .
[0032] The emergency heat exchanger 5 is connected to the low-temperature side return liquid pipe 61 through the third heat exchange circulation pipeline 14, and the emergency heat exchanger 5 is connected to the second heat exchange circulation pipeline 7 through the fourth heat exchange circulation pipeline 17. A diverter three-way valve 11 is provided between the low-temperature side return liquid pipe 61 and the third heat exchange circulation pipeline 14.
[0033] The second heat exchange circulation pipeline 7 is also provided with a cooling water circulation pump 12 , and the cooling water circulation pump 12 is used to pump the coolant in the cooling tower 4 to the waste heat utilization device 3 .
[0034] The low temperature side liquid return pipe 61 is also provided with a thermometer 13. The thermometer 13 can monitor the temperature of the medium in the low temperature side liquid return pipe 61 in real time, and the control system can timely understand the temperature change of the medium. By reading the data of the thermometer 13, the system can more accurately control the flow and temperature of the medium.
[0035] The embodiment of the utility model does not limit the type of the waste heat utilization equipment 3. The waste heat utilization equipment 3 can select one or more of lithium bromide chillers, waste heat power generation equipment, second-type absorption heat pumps, absorption ammonia refrigerators, water vapor compressors, hybrid machines, and heat exchangers. These devices can convert the heat in the high-temperature flue gas generated by the paint stripping furnace 1 into different forms of energy, such as cold water, hot water or electricity, to meet the energy requirements of different processes in industrial production.
[0036] The inlet of the flue gas duct is provided with a first flow control valve 15, and the inlet of the flue gas duct is provided with a second flow control valve 16. The first flow control valve 15 can accurately control the flue gas flow entering the flue gas heat exchanger 2, ensuring that the system can adjust the heat exchange efficiency according to actual needs. When the first flow control valve 15 fails or requires maintenance, the second flow control valve 16 can be used as a backup to ensure that the system continues to operate stably. The first flow control valve 15 and the second flow control valve 16 can work together, and the opening of the two control valves can be flexibly adjusted according to system requirements and working conditions, so as to achieve more refined flow control.
[0037] The working principle of the paint stripping furnace waste heat utilization system of the utility model is as follows:
[0038] First, the high-temperature flue gas discharged from the paint stripping furnace 1 enters the flue gas heat exchanger 2. In the flue gas heat exchanger 2, the high-temperature flue gas exchanges heat with the low-temperature medium entering through the low-temperature liquid supply pipe. After the heat exchange, the temperature of the high-temperature flue gas drops significantly to below 200°C, and then enters the flue gas deep treatment equipment through the flue gas pipeline outlet for subsequent treatment such as desulfurization, dust removal, and denitrification; at the same time, the low-temperature medium absorbs heat during the heat exchange process and the temperature rises. These heated media are then supplied to the waste heat utilization equipment 3 through the high-temperature liquid supply pipe for its use.
[0039] When the bypass line 9 is closed and the third heat exchange circulation line 14 is in a connected state, the emergency heat exchanger 5 and the waste heat utilization device 3 are connected in series. If the bypass line 9 and the third heat exchange circulation line 14 are opened at the same time, the high-temperature medium in the low-temperature side return liquid pipe 61 will be split: one part enters the waste heat utilization device 3, and the other part flows into the emergency heat exchanger 5. At this time, the emergency heat exchanger 5 and the waste heat utilization device 3 are in a parallel state, and both receive high-temperature medium at the same time.
[0040] Specifically, when the waste heat utilization device 3 needs more heat, the bypass line 9 is closed by operating the converging three-way valve 10 to ensure that all high-temperature media enter the waste heat utilization device 3 through the high-temperature side liquid supply pipe 62. If the waste heat utilization device 3 cannot fully utilize the heat after the bypass line 9 is closed, resulting in too high a temperature of the medium flowing through the low-temperature side liquid return pipe 61, the third heat exchange circulation line 14 can be connected to the low-temperature side liquid return pipe 61 by switching the diverting three-way valve 11. In this way, the high-temperature medium will first enter the emergency heat exchanger 5 through the third heat exchange circulation line 14 for cooling, and then return to the flue gas heat exchanger 2 through the low-temperature side liquid return pipe 61, ensuring that the medium reaches a suitable temperature before entering the flue gas heat exchanger 2, thereby ensuring effective cooling of the flue gas.
[0041] On the contrary, when the waste heat utilization device 3 does not need too much heat, the converging three-way valve 10 can be operated to allow part of the high-temperature medium to flow directly back to the low-temperature side return pipe 61 through the bypass pipe 9. At the same time, in order to prevent the high-temperature medium from directly flowing back to the flue gas heat exchanger 2 and affecting the cooling effect, the diverting three-way valve 11 should be operated at the same time to allow the high-temperature medium to enter the emergency heat exchanger 5 through the third heat exchange circulation pipe 14 for cooling, and then return to the flue gas heat exchanger 2 through the low-temperature side return pipe 61.
[0042] The paint stripping furnace waste heat utilization system provided by the utility model not only effectively utilizes the high-temperature flue gas generated by the paint stripping furnace 1 and improves the energy utilization efficiency, but also ensures the stable operation and heat balance of the system through the emergency heat exchanger 5, and has significant economic benefits and environmental protection significance.
[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.
Claims
1. A paint stripping furnace waste heat utilization system, characterized in that: The invention comprises a paint stripping furnace (1), a flue gas heat exchanger (2), a waste heat utilization device (3), a cooling tower (4) and an emergency heat exchanger (5); the high-temperature flue gas outlet of the paint stripping furnace (1) is connected to the flue gas duct inlet of the flue gas heat exchanger (2); the flue gas heat exchanger (2) and the waste heat utilization device (3) are connected via a first heat exchange circulation pipeline (6); the cooling tower (4) and the waste heat utilization device (3) are connected via a second heat exchange circulation pipeline (7); the first heat exchange circulation pipeline (6) comprises a low-temperature side liquid return pipe (61) and a high-temperature side liquid supply pipe (62); the low-temperature side liquid return pipe (61) is used to transport the low-temperature medium in the waste heat utilization device (3) to the flue gas heat exchanger (2) for heat exchange and temperature increase; the high-temperature side liquid supply pipe (62) is used to transport the heated high-temperature medium to the waste heat utilization device (3); the emergency heat exchanger (5) and the waste heat utilization device (3) are connected in parallel or in series.
2. The paint stripping furnace waste heat utilization system according to claim 1, characterized in that: The high-temperature side liquid supply pipe (62) is provided with a heat source circulation pump (8).
3. The paint stripping furnace waste heat utilization system according to claim 1 or 2, characterized in that: The low-temperature side liquid return pipe (61) and the high-temperature side liquid supply pipe (62) are connected via a bypass pipeline (9), and a converging three-way valve (10) is provided between the low-temperature side liquid return pipe (61) and the bypass pipeline (9).
4. The paint stripping furnace waste heat utilization system according to claim 3, characterized in that: The emergency heat exchanger (5) is connected to the low-temperature side liquid return pipe (61) via a third heat exchange circulation pipeline (14), and the emergency heat exchanger (5) is connected to the second heat exchange circulation pipeline (7) via a fourth heat exchange circulation pipeline (17). A diverting three-way valve (11) is provided between the low-temperature side liquid return pipe (61) and the third heat exchange circulation pipeline (14).
5. The paint stripping furnace waste heat utilization system according to claim 1, characterized in that: The second heat exchange circulation pipeline (7) is also provided with a cooling water circulation pump (12), and the cooling water circulation pump (12) is used to pump the coolant in the cooling tower (4) into the waste heat utilization equipment (3).
6. The paint stripping furnace waste heat utilization system according to claim 1, characterized in that: The low-temperature side liquid return pipe (61) is also provided with a thermometer (13).
7. The paint stripping furnace waste heat utilization system according to claim 1, characterized in that: The waste heat utilization equipment (3) is one or more of a lithium bromide chiller, a waste heat power generation device, a second type absorption heat pump, an absorption ammonia refrigerator, a water vapor compressor, a hybrid machine, and a heat exchanger.
8. The paint stripping furnace waste heat utilization system according to claim 1, characterized in that: It also includes a flue gas deep processing device, and the flue gas duct outlet of the flue gas heat exchanger (2) is connected to the flue gas deep processing device.
9. The paint stripping furnace waste heat utilization system according to claim 1, characterized in that: A first flow control valve (15) is provided at the inlet of the flue gas duct.
10. The paint stripping furnace waste heat utilization system according to claim 9, characterized in that: A second flow control valve (16) is provided at the outlet of the flue gas duct.