Surface treatment heating and cooling refrigeration waste heat recovery system and method

Abstract

The application discloses a surface treatment heating and cooling refrigeration waste heat recovery system and method, relates to the field of waste heat recovery, and comprises the following: a double-source high-temperature heat pump unit, which is used for refrigerating a heat storage water tank and heating a heat supply water tank to a first set temperature when heat exchange between the heat storage water tank and a liquid tank is equal in temperature; when the temperature of water in the heat storage water tank is less than a second set temperature, heat is taken from a cooling water tank to heat the heat supply water tank, the cooling water tank is insufficient in waste heat, heat is taken from air to heat water in the heat supply water tank; a water source heat pump unit, which is used for absorbing heat in the cooling water tank and heat in a process tank to heat the heat supply water tank; electric valves of an inlet pipeline and an outlet pipeline of the heat storage water tank are controlled to be closed, electric valves of an inlet pipeline and an outlet pipeline of the cooling water tank are controlled to be opened, cooling water in the cooling water tank is pumped into a first shell-and-tube heat exchanger to circulate and cool, and energy saving, emission reduction and consumption reduction are realized.

Description

Technical Field

[0001] This application relates to the field of waste heat recovery, and in particular to a waste heat recovery system and method for surface treatment heating, cooling and refrigeration. Background Technology

[0002] In recent years, energy conservation and emission reduction have become issues that need to be emphasized in all areas of production and life. In nickel-titanium alloy surface treatment plants, when the chillers, rectifiers, chrome plating, and process tanks are cooled by cooling water, a large amount of heat is generated. The large amount of heat generated cannot be recovered, resulting in energy waste. Therefore, there is an urgent need for a surface treatment heating, cooling, freezing, and heat recovery waste heat recovery system and method that can meet the heating, cooling, freezing, and heat recovery needs of the entire surface treatment plant. Summary of the Invention

[0003] The purpose of this application is to provide a surface treatment heating, cooling, and refrigeration waste heat recovery system and method, which can meet the heating, cooling, freezing, and heat recovery processes of the entire surface treatment plant, and achieve energy saving, emission reduction, and consumption reduction.

[0004] To achieve the above objectives, this application provides the following solution:

[0005] In a first aspect, this application provides a surface treatment heating, cooling, and refrigeration waste heat recovery system, comprising:

[0006] The dual-source high-temperature heat pump unit includes a high-efficiency tank, a first shell-and-tube heat exchanger, an air-source evaporator, a first compressor, and a first gas separator. It is used to: cool the insulated hot water storage tank when the insulated hot water storage tank and the liquid tank reach the same temperature, and heat the supply hot water tank to a first set temperature to supply heat to the medium-temperature liquid tank; when the temperature of the water in the insulated hot water storage tank is lower than a second set temperature, the heat pump switches to extract heat from the cooling water tank to supply heat to the supply hot water tank; if the residual heat in the cooling water tank is insufficient, the fan is activated to extract heat from the air to heat the water in the supply hot water tank.

[0007] A water source heat pump unit is used to: absorb heat from the cooling water tank and the process tank when cooling water in the cooling water tank is used to cool the process tank, and transport the heat to the hot water supply tank to heat the hot water supply tank to a first set temperature so as to achieve cooling of the cooling water tank;

[0008] The hot water variable frequency pump input system of the production line controls the electric valves of the inlet and outlet pipes of the insulated hot water storage tank to close, and the electric valves of the inlet and outlet pipes of the cooling water tank to open, so as to pump the cooling water in the cooling water tank into the first shell and tube heat exchanger for circulation and cooling.

[0009] Optionally, the surface treatment heating, cooling and refrigeration waste heat recovery system includes a closed cooling tower module, which is used to: when the heat of the cooling water in the cooling water tank cannot be cooled by the water source heat pump unit, or when the heat reaches a first set temperature, pump the heat into the cooling water tank through a water pump for cooling.

[0010] Optionally, the surface treatment heating, cooling, and refrigeration waste heat recovery system further includes a refrigeration module, wherein the refrigeration unit in the refrigeration module is a water-cooled refrigeration unit; the water-cooled refrigeration unit includes a shell-and-tube heat exchanger, a condenser of the water-cooled refrigeration unit, a second shell-and-tube heat exchanger, a second compressor, a second gas separator, and a four-way valve; the liquid outlet of the second compressor and the liquid inlet of the second gas separator are connected to the four-way valve through pipelines; the shell-and-tube heat exchanger and the second shell-and-tube heat exchanger are connected to the four-way valve;

[0011] The condenser of the water-cooled chiller unit is cooled by circulating cooling water in the cooling water tank. As the heat in the cooling water tank increases, the tap water carries away the heat through the second shell and tube heat exchanger. When the temperature of the cooling water in the cooling water tank is not lower than the third set temperature, the cooling water starts the water source heat pump unit to achieve the purpose of cooling and recovering heat to the hot water supply tank.

[0012] Optionally, the surface treatment heating, cooling, and refrigeration waste heat recovery system further includes an electromagnetic energy module, which is used to: supply hot water from the hot water tank to the electromagnetic steam generator furnace, and the electromagnetic steam generator heats the hot water into steam; the steam is installed in the hot water tank, and in a rapid heating state, the steam directly hits the hot water in the hot water tank for heating.

[0013] Optionally, the steam is installed into the hot water tank using a silencer principle.

[0014] Optionally, the surface treatment heating, cooling and refrigeration waste heat recovery system further includes a pure water module, which is used to provide pure water to the hot water tank, the insulated hot water storage tank, the chilled water tank and the cooling water tank.

[0015] Optionally, the first set temperature is 85°C.

[0016] Optionally, the second set temperature is 20°C.

[0017] Optionally, the third set temperature is 32°C.

[0018] Secondly, this application provides a method for recovering waste heat from surface treatment heating, cooling, and refrigeration, including:

[0019] When the insulated hot water storage tank and the liquid tank exchange heat to the same temperature, the insulated hot water storage tank is cooled, and the hot water supply tank is heated to the first set temperature to supply heat to the medium-temperature liquid tank; when the temperature of the water in the insulated hot water storage tank is lower than the second set temperature, the heat pump is switched to extract heat from the cooling water tank to supply the hot water supply tank. If the residual heat of the cooling water tank is insufficient, the fan is started to extract heat from the air to heat the water in the hot water supply tank.

[0020] When the cooling water in the cooling water tank is used to cool the process tank, the heat in the cooling water tank and the heat in the process tank are absorbed and transported to the hot water supply tank to heat the hot water supply tank to the first set temperature, so as to achieve the cooling of the cooling water tank.

[0021] The hot water variable frequency pump input system of the production line controls the electric valves of the inlet and outlet pipes of the insulated hot water storage tank to close, and the electric valves of the inlet and outlet pipes of the cooling water tank to open, so as to pump the cooling water in the cooling water tank into the first shell and tube heat exchanger for circulation and cooling.

[0022] According to the specific embodiments provided in this application, the following technical effects are disclosed:

[0023] This application provides a surface treatment heating, cooling, and refrigeration waste heat recovery system and method. When the insulated hot water storage tank and the liquid tank exchange heat to reach the same temperature, the insulated hot water storage tank is cooled, and the hot water supply tank is heated to a first set temperature. When the water temperature in the insulated hot water storage tank is lower than a second set temperature, heat is extracted from the cooling water tank and transferred to the hot water supply tank. If the cooling water tank has insufficient waste heat, heat is extracted from the air to heat the water in the hot water supply tank. A water source heat pump unit is used to absorb heat from the cooling water tank and the process tank to heat the hot water supply tank. The system controls the electric valves of the inlet and outlet pipes of the insulated hot water storage tank to close, and the electric valves of the inlet and outlet pipes of the cooling water tank to open, pumping the cooling water from the cooling water tank into the first shell-and-tube heat exchanger for circulating cooling. This satisfies the heating, cooling, freezing, and heat recovery processes of the entire surface treatment plant, achieving energy saving, emission reduction, and consumption reduction. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of a surface treatment heating, cooling, and refrigeration waste heat recovery system provided in an embodiment of this application.

[0026] Figure label:

[0027] Insulated hot water storage tank—1, Hot water supply tank—2, Closed-loop cooling tower module—3, Cold water tank—4, Pure water module—5, Electromagnetic energy module—6, Dual-source high-temperature heat pump unit—7, Water-cooled chiller unit—8, First electric valve—9-1, Second electric valve—9-2, Third electric valve—9-3, Fourth electric valve—9-4, Fifth electric valve—9-5, Sixth electric valve—9-6, Seventh electric valve—9-7, Eighth electric valve—9-8, First manual valve—10-1, Second manual valve—10-2, Third manual valve—10-3, Fourth manual valve—10-4, Manual valve—10-4, Fifth manual valve—10-5, Sixth manual valve—10-6, Seventh manual valve—10-7, Eighth manual valve—10-8, Ninth manual valve—10-9, Tenth manual valve—10-10, Eleventh manual valve—10-11, Twelfth manual valve—10-12, Thirteenth manual valve—10-13, Fourteenth manual valve—10-14, Fifteenth manual valve—10-15, Sixteenth manual valve—10-16, Seventeenth manual valve—10-17, Eighteenth manual valve—10-18, Nineteenth manual valve —10-19, 20th manual valve—10-20, 21st manual valve—10-21, 22nd manual valve—10-22, 23rd manual valve—10-23, 24th manual valve—10-24, 25th manual valve—10-25, 26th manual valve—10-26, 27th manual valve—10-27, 28th manual valve—10-28, 1st water pump—11-2, 2nd water pump—11-2, 3rd water pump—11-3, 4th water pump—11-4, 5th water pump—11-5, 6th water pump Pumps—11-6, Seventh Water Pump—11-7, Eighth Water Pump—11-8, Ninth Water Pump—11-9, Tenth Water Pump—11-10, First Check Valve—12-1, Second Check Valve—12-2, Chilled Water Tank—13, High-Efficiency Tank—14, Air Source Evaporator—15, First Shell and Tube Heat Exchanger—16, First Four-Way Valve—17, First Compressor—18, First Gas Separator—19, Shell and Tube Heat Exchanger—20, Second Shell and Tube Heat Exchanger—21, Second Four-Way Valve—22, Second Compressor—23, Second Gas Separator—24, Silencer—25. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] In one exemplary embodiment, such as Figure 1 As shown, a surface treatment heating, cooling and refrigeration waste heat recovery system is provided, including a dual-source high-temperature heat pump unit 7, a water-cooled refrigeration unit 8, a waste heat recovery module, a closed cooling tower module 3, a refrigeration unit module, an electromagnetic energy module 6 and a pure water module 5.

[0031] The dual-source high-temperature heat pump unit 7 includes a high-efficiency tank 14, a first shell-and-tube heat exchanger 16, an air-source evaporator 15, a first compressor 18, a first four-way valve 17, and a first gas separator 19. It is used to: cool the insulated hot water storage tank 1 and heat the supply hot water tank 2 to a first set temperature when the insulated hot water storage tank 1 and the liquid tank reach the same temperature; when the water temperature in the insulated hot water storage tank 1 is lower than a second set temperature, the heat pump switches to extract heat from the cooling water tank 4 to supply heat to the supply hot water tank 2. If the residual heat in the cooling water tank 4 is insufficient, a fan is activated to extract heat from the air to heat the water in the supply hot water tank 2. The second set temperature is 20℃.

[0032] The liquid outlet of the first compressor 18 and the liquid inlet of the first gas separator 19 are connected to the first four-way valve 17 via pipes. The liquid outlet of the first gas separator 19 is connected to the first compressor 18 via a pipe. The high-efficiency tank 14 and the first shell-and-tube heat exchanger 16 are connected to the first four-way valve 17. The high-efficiency tank 14 is also connected to the air source evaporator 15 via a pipe. A first electronic expansion valve is installed on the pipe connecting the high-efficiency tank 14 and the air source evaporator 15. The first electronic expansion valve is used to control the flow rate in the pipe connecting the high-efficiency tank 14 and the air source evaporator 15. The first shell-and-tube heat exchanger 16 is connected to the air source evaporator 15 via a pipe. On the two connecting pipes between the high-efficiency tank 14 and the hot water supply tank 2, the two pipes near the end of the high-efficiency tank 14 are respectively equipped with the eighteenth manual valve 10-18 and the nineteenth manual valve 10-19, and the two pipes near the end of the hot water supply tank 2 are respectively equipped with the fourth manual valve 10-4 and the twenty-sixth manual valve 10-26. Hot water from the hot water supply tank 2 is pumped out by the fifth water pump 11-5 and flows sequentially through the fourth manual valve 10-4 and the nineteenth manual valve 10-19 into the high-efficiency tank 14. The dual-source high-temperature heat pump unit 7 recovers waste heat from the cooling water tank 4 to the hot water supply tank 2 via the fifth electric valve 9-5 and the twenty-first manual valve 10-21, and recovers waste heat from the cooling water tank 4 to the hot water supply tank 2 via the eighteenth manual valve 10-18 and the twenty-sixth manual valve 10-26 to heat the water in the hot water supply tank 2. The dual-source high-temperature heat pump unit 7 cools and recovers heat from the stored heat or heats the waste heat from the liquid tank in the insulated hot water storage tank 1 via the twentieth manual valve 10-20, the sixth electric valve 9-6, and the eighth electric valve 9-8.

[0033] The connecting pipe between the insulated hot water storage tank 1 and the cooling water tank 4 is equipped with a 20th manual valve 10-20, an 8th electric valve 9-8, and a 6th electric valve 9-6, with the flow direction as follows: Figure 1 The direction indicated by the arrow in the image.

[0034] Dual-source high-temperature heat pump unit 7 operating mode description:

[0035] 1. Preheating stage: First, the insulated hot water storage tank 1 exchanges heat with the liquid tank until the temperature is the same. Then, the heat pump switches to cool the insulated hot water storage tank 1 to heat the hot water tank 2 and supply heat to the medium-temperature liquid tank.

[0036] When the temperature in the insulated hot water storage tank 1 drops to the second set temperature, the heat pump will switch to extract heat from the cooling water tank 4 to supply the hot water tank 2. If the residual heat in the cooling water tank 4 is insufficient, the fan will be turned on to extract some heat from the air to supplement it.

[0037] If the temperature of the hot water tank 2 has been reached, the temperature of the cooling water tank 4 will gradually rise, and the fan will be turned on to allow the fins to dissipate heat from the cooling water tank 4.

[0038] 2. Waste heat recovery mode at the end of the workday: First, the liquid tank and the insulated hot water storage tank 1 exchange heat. When the temperature difference between the liquid tank and the insulated hot water storage tank 1 is consistent, the system switches to heating mode. Then, the evaporator in the first shell and tube heat exchanger 16 of the dual-source high-temperature heat pump unit 7 provides cooling, and the condenser of the high-efficiency tank 14 provides heating to the hot water supply tank 2. The system stops when the liquid tank temperature drops to 20°C.

[0039] 3. Preheating mode before work: The liquid tank is preheated by circulating between the liquid tank and the insulated hot water storage tank 1 until the temperature difference between the liquid tank and the insulated hot water storage tank 1 is consistent, then the heating mode is switched.

[0040] 4. In this application, the system heat pump mainly recovers the waste heat of the cooling water tank 4, while also ensuring that it provides heat energy to the hot water tank 2. The two systems cannot be in a balance of heat and cold, so an air source is used to maintain the balance. Specifically, when the waste heat of the cooling water tank 4 is insufficient to heat the temperature of the hot water tank 2 to the set temperature, air is recovered through the air source evaporator 15 and converted into steam to provide heat energy to the hot water tank 2.

[0041] The insulated hot water storage tank 1 is connected to the liquid tank via a heating coil leading to a low-temperature liquid tank, allowing circulation between the liquid tank and the insulated hot water storage tank 1. This ensures that the liquid tank and the insulated hot water storage tank 1 have the same temperature. Water in the insulated hot water storage tank 1 reaches the liquid tank through a first heating coil leading to a low-temperature liquid tank, and water in the liquid tank reaches the insulated hot water storage tank 1 through a second heating coil leading to a low-temperature liquid tank. The first heating coil leading to a low-temperature liquid tank is sequentially equipped with a first electric valve 9-1 and a control valve module. The control valve module includes a first connection route and a second connection route. The first connection route sequentially includes a first manual valve 10-1, a first water pump 11-2, and a first check valve 12-1. The second connection route sequentially includes a second manual valve 10-2, a second water pump 11-2, and a second check valve 12-2. The second heating coil leading to a low-temperature liquid tank is equipped with a second electric valve 9-2.

[0042] A fourth electric valve 9-4 is installed on the connecting pipe between the first low-temperature liquid tank heating coil and the hot water supply tank 2, and a third electric valve 9-3 is installed on the connecting pipe between the second low-temperature liquid tank heating coil and the hot water supply tank 2.

[0043] The connecting pipe from the insulated hot water storage tank 1 to the first shell and tube heat exchanger 16 is equipped with a seventh electric valve 9-7, a ninth water pump 11-9, and a twenty-first manual valve 10-21. The connecting pipe from the first shell and tube heat exchanger 16 to the insulated hot water storage tank 1 is equipped with a twentieth manual valve 10-20 and a sixth electric valve 9-6.

[0044] Cooling water in hot water tank 2 is circulated to 85℃ via air-source heat pump. The circulation stops when the temperature in hot water tank 2 reaches the first set temperature. The control valve module of hot water tank 2 then pumps hot water into the nickel-titanium alloy production line, heating the hot water in each tank to the set process temperature. The flow rates of the first and second pumps in the control valve module differ. Each tank's pipeline is equipped with valves and electric valves. When the set temperature is reached, the pumps operate at a constant pressure of 0.3–0.4 MPa using frequency conversion, and the pressure is adjustable via frequency conversion. The first set temperature is 85℃.

[0045] The water source heat pump unit is used to: absorb heat from the cooling water tank 4 and the process tank when the cooling water in the cooling water tank 4 is used to cool the process tank, and transport the heat to the hot water supply tank 2 to heat the hot water supply tank 2 to a first set temperature, so as to achieve cooling of the cooling water tank 4.

[0046] When the chiller, rectifier, chrome plating, and process tanks are cooled by cooling water, a large amount of heat is generated. The heat in the cooling water tank 4 is pumped into the water source heat pump unit for cooling. The heat absorbed by the water source heat pump is transferred to the hot water tank 2 to cool the cooling water tank 4, realizing the recovery and reuse of heat, and the heat exchange cycle continues.

[0047] The hot water variable frequency pump input system of the production line controls the electric valves of the inlet and outlet pipes of the insulated hot water storage tank 1 to close, that is, the sixth electric valve 9-6 and the seventh electric valve 9-7 are closed, and the electric valves of the inlet and outlet pipes of the cooling water tank 4 to open, that is, the fifth electric valve 9-5 and the eighth electric valve 9-8 are closed, so that the cooling water in the cooling water tank 4 is pumped into the first shell and tube heat exchanger 16 for circulation and cooling.

[0048] The closed-loop cooling tower module 3 is used to: cool the water in the cooling water tank 4 when the heat cannot be cooled by the water source heat pump unit, or when the heat reaches a first set temperature, by pumping heat into the cooling water tank 4 for cooling. The closed-loop cooling tower module 3 includes a closed-loop cooling tower water tank and closed-loop cooling tower coils.

[0049] When the heat from the cooling water in the cooling water tank 4 cannot be cooled by the water source heat pump unit, or when the heat has met the 85°C requirement of the production line, the heat from the cooling water tank 4 is pumped into the closed cooling tower module 3 by the sixth water pump 11-6 for cooling.

[0050] The connecting pipe from cooling water tank 4 to closed-circuit cooling tower module 3 is equipped with an eighth manual valve 10-8 and a sixth manual valve 10-6, and the connecting pipe from closed-circuit cooling tower module 3 to cooling water tank 4 is equipped with a fifth manual valve 10-5 and a ninth manual valve 10-9. Tap water is pumped into closed-circuit cooling tower module 3 via a third water pump 11-3 and a seventh manual valve 10-7. The third water pump 11-3 is a spray pump.

[0051] Winter room temperature requirements for the cold water cleaning tank on the production line: Utilizing the heat from cooling water tank 4, a 20㎡ non-metallic heat exchanger is installed in cooling water tank 4. Tap water first absorbs heat from cooling water tank 4 through the heat exchanger, heating the tap water to room temperature. It is then piped to the production line cleaning water tank replenishment system.

[0052] The refrigeration unit in the refrigeration module is a water-cooled refrigeration unit 8; the water-cooled refrigeration unit 8 includes a shell-and-tube heat exchanger 20, a second shell-and-tube heat exchanger 21, a second compressor 23, a second gas separator 24, and a second four-way valve 22; the liquid outlet of the second compressor 23 and the liquid inlet of the second gas separator 24 are connected to the second four-way valve 22 through pipes; the shell-and-tube heat exchanger 20 and the second shell-and-tube heat exchanger 21 are connected to the second four-way valve 22.

[0053] The condenser in the water-cooled chiller unit 8 is cooled by circulating cooling water in the cooling water tank 4. As the heat in the cooling water tank 4 increases, the tap water carries away the heat through the second shell and tube heat exchanger 21. When the temperature of the cooling water in the cooling water tank 4 is not lower than the third set temperature, the cooling water starts the water source heat pump unit to achieve the purpose of cooling and recovers the heat to the hot water supply tank 2.

[0054] When the eleventh manual valve 10-11 is opened, the fourth water pump 11-4 pumps the cooling water in the cooling water tank 4 into the pipeline where the eleventh manual valve 10-11 is located to cool the water-cooled rectifier. The heat from the water-cooled rectifier is recovered to the cooling water tank 4 through the pipeline where the tenth manual valve 10-10 is located.

[0055] The chiller uses a water-cooled chiller unit 8. The condenser of the water-cooled chiller unit 8 is located in a shell-and-tube heat exchanger 20. The condenser is cooled by circulating cooling water from the cooling water tank 4. As the heat in the cooling water tank 4 increases, the tap water carries away the heat through the heat exchanger. When the temperature reaches or exceeds the third set temperature, the cooling water activates the water source heat pump unit to achieve cooling and recover heat to the hot water supply tank 2. The chilled water tank 13 is prepared with 40% ethylene glycol and pure water. The chilled water in the chilled water tank 13 is cooled to the fourth set temperature. A standby variable frequency water pump pumps the chilled water into each tank of the anodizing line for cooling. The pipeline pressure is maintained at ≤0.3~0.4Mpa and is variable frequency adjustable. The third set temperature is 32℃, and the fourth set temperature is -12℃.

[0056] The connecting pipe from the shell-and-tube heat exchanger 20 to the cooling water tank 4 is equipped with a 22nd manual valve 10-22 and a 14th manual valve 10-14. The cooling water tank 4 to the shell-and-tube heat exchanger 20 is equipped with a 15th manual valve 10-15, a 7th water pump 11-7, and a 24th manual valve 10-24.

[0057] The connecting pipe from the second shell-and-tube heat exchanger 21 to the chilled water tank 13 is equipped with a twenty-third manual valve 10-23, and the connecting pipe from the chilled water tank 13 to the second shell-and-tube heat exchanger 21 is equipped with a tenth water pump 11-10 and a twenty-fifth manual valve 10-25.

[0058] The chilled liquid in the chilled water tank 13 is sent to the liquid supply tank for cooling through the pipeline of the eighth water pump 11-8.

[0059] Waste heat recovery module: After get off work, the hot water variable frequency pump inputs into the production line system, the electric valves of the inlet and outlet pipes of the hot water tank 2 are closed, and the electric valves of the cooling water inlet and outlet are opened, pumping the cooling water into the first shell-and-tube heat exchanger 16 for circulation and cooling. The heat in the tank is carried back to the cooling water tank 4, where the water source heat pump unit converts the heat from the cooling water into hot water at the first set temperature, which then enters the insulated hot water storage tank 1. When the heat in the insulated storage tank reaches the first set temperature, the water source heat pump unit is shut off, and the heat in the tank drops to the process temperature of the next day's weather forecast +5℃, achieving energy saving and emission reduction, preventing heat loss from the process tank, and simultaneously solving the acid mist corrosion problem of the nickel-titanium alloy production line, ensuring the service life of the plant's steel structure.

[0060] The electromagnetic energy module 6 is used to: supply hot water to the electromagnetic steam generator furnace from the hot water tank 2, and the electromagnetic steam generator heats the hot water into steam; the steam is installed in the hot water tank 2, and in the rapid heating state, the steam directly hits the hot water tank 2 to heat the hot water.

[0061] When the temperature of the hot water tank 2 is insufficient, supplemental heating is provided by the electromagnetic energy module 6. The electromagnetic energy module 6 obtains water through a connection pipe with the pure water module 5, heats the obtained water to produce steam, and the steam output by the electromagnetic energy module 6 is transported to the hot water tank 2 through the connection pipes of the twenty-seventh manual valve 10-27 and the third manual valve 10-3. The steam temperature is 135-170℃. The steam output by the electromagnetic energy module 6 is also used to heat the high-temperature liquid tank.

[0062] Hot water from the hot water supply tank 2 supplies hot water to the electromagnetic steam generator furnace, which is then heated into steam via electromagnetic induction. The maximum steam pressure is 0.7 MPa, used for heating tanks above 70°C. Simultaneously, the steam is introduced into the hot water supply tank 2 using a silencer 25. In rapid heating conditions, steam can be directly injected into the hot water for heating. That is, the hot water supply tank 2 is equipped with a silencer 25. Steam heating: The steam source provided by the electromagnetic energy module 6 heats the tanks on the production line above 70°C.

[0063] The pure water module 5 is used to provide pure water to the hot water tank 2, the insulated hot water storage tank 1, the chilled water tank 13, and the cooling water tank 4.

[0064] The electromagnetic energy module 6, hot water supply tank 2, insulated hot water storage tank 1, cooling water tank 4, and pure water module 5 are connected on the same pipeline. The pipeline connecting pure water module 5 and hot water supply tank 2 is equipped with a thirteenth manual valve 10-13 and a sixteenth manual valve 10-16. The pipeline connecting pure water module 5 and insulated hot water storage tank 1 is equipped with a thirteenth manual valve 10-13 and a twelfth manual valve 10-12. The pipeline connecting pure water module 5 and electromagnetic energy module 6 is equipped with a thirteenth manual valve 10-13 and a seventeenth manual valve 10-17. The pipeline connecting pure water module 5 and cooling water tank 4 is equipped with a thirteenth manual valve 10-13 and a twenty-eighth manual valve 10-28.

[0065] The pure water module 5 utilizes tap water supply, passing deionized water through a reverse osmosis membrane to extract pure water, which is then supplied to the hot water tank 2, the insulated hot water storage tank 1, the chilled water tank 13, and the cooling water tank 4. This prevents excessive calcium and magnesium ion levels in the tap water and groundwater supplied to the cooling water at the production line location, which could lead to leaks and contamination of the heat exchangers in the process tanks of the production line. It also prevents pipe and equipment buildup, thus reducing cleaning difficulties.

[0066] The above modules meet the heating, cooling, freezing, and heat recovery needs of the entire surface treatment plant, achieving energy conservation, emission reduction, and consumption reduction. The system adopts flow meters, smart water meters, pressure sensors, and an ERP+MES+automatic control system to realize the entire heating and recovery process.

[0067] Based on the same inventive concept, this application also provides a method for implementing the surface treatment heating, cooling, and refrigeration waste heat recovery system described above. The solution provided by this method is similar to the implementation scheme described in the above system. Therefore, the specific limitations in one or more embodiments of the surface treatment heating, cooling, and refrigeration waste heat recovery method provided below can be found in the limitations of the surface treatment heating, cooling, and refrigeration waste heat recovery system described above, and will not be repeated here.

[0068] In one exemplary embodiment, this application provides a method for recovering waste heat from surface treatment heating, cooling, and refrigeration, including:

[0069] When the insulated hot water storage tank 1 and the liquid tank reach the same temperature through heat exchange, the insulated hot water storage tank 1 is cooled, and the hot water supply tank 2 is heated to the first set temperature to supply heat to the medium-temperature liquid tank; when the temperature of the water in the insulated hot water storage tank 1 is lower than the second set temperature, the heat pump is switched to extract heat from the cooling water tank 4 to supply heat to the hot water supply tank 2; if the residual heat of the cooling water tank 4 is insufficient, the fan is started to extract heat from the air to heat the water in the hot water supply tank 2.

[0070] When the cooling water in the cooling water tank 4 is used to cool the process tank, the heat in the cooling water tank 4 and the heat in the process tank are absorbed and transported to the hot water supply tank 2 to heat the hot water supply tank 2 to the first set temperature, so as to achieve the cooling of the cooling water tank 4.

[0071] The hot water variable frequency pump input system of the production line controls the electric valves of the inlet and outlet pipes of the insulated hot water storage tank 1 to close, and the electric valves of the inlet and outlet pipes of the cooling water tank 4 to open, so as to pump the cooling water in the cooling water tank 4 into the first shell and tube heat exchanger 16 for circulation and cooling.

[0072] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A surface treatment heating, cooling, and refrigeration waste heat recovery system, characterized in that, The surface treatment heating, cooling, and refrigeration waste heat recovery system includes: The dual-source high-temperature heat pump unit includes a high-efficiency tank, a first shell-and-tube heat exchanger, an air-source evaporator, a first compressor, and a first gas separator. The liquid outlet of the first compressor and the liquid inlet of the first gas separator are connected to a first four-way valve via pipes. The liquid outlet of the first gas separator is connected to the first compressor via a pipe. The high-efficiency tank and the first shell-and-tube heat exchanger are connected to the first four-way valve. The high-efficiency tank is also connected to the air-source evaporator via a pipe, and the first shell-and-tube heat exchanger is connected to the air-source evaporator via a pipe. On the two connecting pipes between the high-efficiency tank and the hot water supply tank, the two pipes near the high-efficiency tank end are respectively equipped with an eighteenth manual valve and a nineteenth manual valve, and the two pipes near the hot water supply tank end are respectively equipped with a fourth manual valve and a twenty-sixth manual valve. Hot water from the hot water supply tank is pumped out by a fifth water pump and enters the high-efficiency tank sequentially through the fourth manual valve and the nineteenth manual valve. A second manual valve is installed on the connecting pipe between the first shell-and-tube heat exchanger and the insulated hot water storage tank. The system includes a 10-manual valve and a 6-electric valve; a 7-electric valve, a 9-water pump, and a 21-manual valve are installed on the connecting pipe from the insulated hot water storage tank to the first shell-and-tube heat exchanger; a 20-manual valve and an 8-electric valve are installed on the connecting pipe from the first shell-and-tube heat exchanger to the cooling water tank; a 5-electric valve, a 9-water pump, and a 21-manual valve are installed on the connecting pipe from the cooling water tank to the first shell-and-tube heat exchanger; the dual-source high-temperature heat pump unit is used to: cool the insulated hot water storage tank when the insulated hot water storage tank and the liquid tank reach the same temperature, and heat the hot water supply tank to the first set temperature to supply heat to the medium-temperature liquid tank; when the temperature of the water in the insulated hot water storage tank is lower than the second set temperature, the heat pump switches to extract heat from the cooling water tank to supply heat to the hot water supply tank; if the residual heat in the cooling water tank is insufficient, the fan of the air source evaporator is started to extract heat from the air to heat the water in the hot water supply tank; the insulated hot water storage tank is connected to the liquid tank via a heating coil leading to the low-temperature liquid tank; A water source heat pump unit is used to: absorb heat from the cooling water tank and the process tank when cooling water in the cooling water tank is used to cool the process tank, and transport the heat to the hot water supply tank to heat the hot water supply tank to a first set temperature so as to achieve cooling of the cooling water tank; The hot water variable frequency pump input system of the production line controls the electric valves of the inlet and outlet pipes of the insulated hot water storage tank to close, and the electric valves of the inlet and outlet pipes of the cooling water tank to open, so as to pump the cooling water in the cooling water tank into the first shell and tube heat exchanger for circulation and cooling.

2. The surface treatment heating, cooling, and refrigeration waste heat recovery system according to claim 1, characterized in that, The surface treatment heating, cooling, and refrigeration waste heat recovery system includes a closed-loop cooling tower module. The closed-loop cooling tower module is used to: when the heat of the cooling water in the cooling water tank cannot be cooled by the water source heat pump unit, or when the heat reaches a first set temperature, the heat in the cooling water tank is pumped into the closed-loop cooling tower module by a water pump to cool the cooling water in the cooling water tank.

3. The surface treatment heating, cooling, and refrigeration waste heat recovery system according to claim 1, characterized in that, The surface treatment heating, cooling, and refrigeration waste heat recovery system also includes a refrigeration module. The refrigeration unit in the refrigeration module is a water-cooled refrigeration unit. The water-cooled refrigeration unit includes a shell-and-tube heat exchanger, a second shell-and-tube heat exchanger, a second compressor, a second gas separator, and a four-way valve. The liquid outlet of the second compressor and the liquid inlet of the second gas separator are connected to the four-way valve through pipes. The shell-and-tube heat exchanger and the second shell-and-tube heat exchanger are connected to the four-way valve. The connecting pipe from the shell-and-tube heat exchanger to the cooling water tank is equipped with a twenty-second manual valve and a fourteenth manual valve. The connecting pipe from the cooling water tank to the shell-and-tube heat exchanger is equipped with a fifteenth manual valve, a seventh water pump, and a twenty-fourth manual valve. The connecting pipe from the second shell-and-tube heat exchanger to the chilled water tank is equipped with a twenty-third manual valve. The connecting pipe from the chilled water tank to the second shell-and-tube heat exchanger is equipped with a tenth water pump and a twenty-fifth manual valve. The shell-and-tube heat exchanger of the water-cooled chiller unit uses circulating cooling water in the cooling water tank for cooling. When the heat in the cooling water tank increases and the temperature of the cooling water in the cooling water tank is not lower than the third set temperature, the water source heat pump unit is started to cool down the cooling water in the cooling water tank and recover the heat to the hot water supply tank.

4. The surface treatment heating, cooling, and refrigeration waste heat recovery system according to claim 1, characterized in that, The surface treatment heating, cooling, and refrigeration waste heat recovery system also includes an electromagnetic energy module, which is used to: supply hot water from the hot water tank to the electromagnetic steam generator furnace, and the electromagnetic steam generator heats the hot water into steam; the steam is transported to the hot water tank, and under rapid heating conditions, the hot water in the hot water tank is heated by direct steam jet.

5. The surface treatment heating, cooling, and refrigeration waste heat recovery system according to claim 4, characterized in that, Steam is installed into the hot water tank using a silencer principle.

6. The surface treatment heating, cooling, and refrigeration waste heat recovery system according to claim 1, characterized in that, The surface treatment heating, cooling, and refrigeration waste heat recovery system also includes a pure water module, which is used to provide pure water to the hot water tank, the insulated hot water storage tank, the chilled water tank, and the cooling water tank.

7. The surface treatment heating, cooling, and refrigeration waste heat recovery system according to claim 1, characterized in that, The first set temperature is 85°C.

8. The surface treatment heating, cooling, and refrigeration waste heat recovery system according to claim 1, characterized in that, The second set temperature is 20°C.

9. The surface treatment heating, cooling, and refrigeration waste heat recovery system according to claim 3, characterized in that, The third set temperature is 32°C.

10. A method for recovering waste heat from surface treatment heating, cooling, and refrigeration based on any one of claims 1-9, wherein the method comprises: When the insulated hot water storage tank and the liquid tank exchange heat to the same temperature, the insulated hot water storage tank is cooled, and the hot water supply tank is heated to the first set temperature to supply heat to the medium-temperature liquid tank; when the temperature of the water in the insulated hot water storage tank is lower than the second set temperature, the heat pump is switched to extract heat from the cooling water tank to supply the hot water supply tank. If the residual heat in the cooling water tank is insufficient, the fan of the air source evaporator is started to extract heat from the air to heat the water in the hot water supply tank. When the cooling water in the cooling water tank is used to cool the process tank, the heat in the cooling water tank and the heat in the process tank are absorbed and transported to the hot water supply tank to heat the hot water supply tank to the first set temperature, so as to achieve the cooling of the cooling water tank. The hot water variable frequency pump input system of the production line controls the electric valves of the inlet and outlet pipes of the insulated hot water storage tank to close, and the electric valves of the inlet and outlet pipes of the cooling water tank to open, so as to pump the cooling water in the cooling water tank into the first shell and tube heat exchanger for circulation and cooling.

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