Factory heat energy recovery system

Abstract

The utility model relates to a factory heat energy recovery system, and relates to the technical field of heat energy recovery. The factory heat energy recovery system comprises a centralized oil supply hydraulic pump station, a warm air conditioner, a pump station cooling unit, a first heat exchanger and a second heat exchanger. A hydraulic oil tank of the centralized oil supply hydraulic pump station is respectively communicated with the first heat exchanger and the second heat exchanger through a first circulating pipeline; and the first heat exchanger is communicated with a circulating water path of the warm air conditioner through a second circulating pipeline. According to the factory heat energy recovery system, the function that heat energy generated by the centralized oil supply hydraulic pump station is recovered into the warm air conditioner to supply heat to a factory in winter is achieved, energy consumption of a pump station cooling unit is omitted, energy consumption of the warm air conditioner is reduced, and the effects of saving energy, reducing emission, being environmentally friendly and reducing factory cost expenditure can be achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat energy recovery, in particular to a factory heat energy recovery system. BACKGROUND

[0002] In steel plants, power plants and hydraulic component production enterprises, centralized oil supply hydraulic pump stations are usually used to provide hydraulic energy as a power source for production or testing. The centralized oil supply hydraulic pump station mainly consists of a motor pump group, a hydraulic oil tank, a circulating filtration system, an electrical control system and the like. A large amount of heat energy generated during the operation of the equipment will cause the temperature of the hydraulic oil in the hydraulic oil tank of the centralized oil supply hydraulic pump station to rise. In order to control the temperature of the hydraulic oil within a reasonable working range, the hydraulic oil needs to be continuously cooled.

[0003] The typical cooling scheme for the hydraulic oil of the centralized oil supply hydraulic pump station is to install an independent pump station cooling system to cool the hydraulic oil. The pump station cooling system mainly consists of an air-cooled screw variable frequency water chiller, a mixed water tank, a water pump and a pipeline system, an electrical control system and the like. The working principle is that the air-cooled screw variable frequency water chiller cools the chilled circulating water in the mixed water tank, and controls the water temperature in the mixed water tank to be between 20℃ and 25℃. The chilled circulating water in the mixed water tank is pumped by the water pump through the pipeline system to the plate heat exchanger of the centralized oil supply hydraulic pump station to cool the hydraulic oil. The heated circulating water is returned to the mixed water tank through the pipeline system for circulation cooling.

[0004] At present, the pump station cooling system is basically needed for continuous cooling of the centralized oil supply hydraulic pump station throughout the year in the production process of the factory. During the operation of the centralized oil supply hydraulic pump station, not only its own energy is consumed, but also additional electrical energy consumption of the pump station cooling system is added, and the heat energy of the centralized oil supply hydraulic pump station is wasted. CONTENT OF THE INVENTION

[0005] In order to achieve the goal of energy saving and emission reduction, green environmental protection and reduction of factory operating costs, the present application provides a factory heat energy recovery system.

[0006] The factory heat energy recovery system provided by the present application adopts the following technical scheme:

[0007] The factory heat energy recovery system comprises a centralized oil supply hydraulic pump station, a warm air conditioner, a pump station cooling unit, a first heat exchanger and a second heat exchanger; the hydraulic oil tank of the centralized oil supply hydraulic pump station is connected with the first heat exchanger and the second heat exchanger through first circulating pipelines respectively; the first heat exchanger is connected with the circulating water path of the warm air conditioner through a second circulating pipeline, and the first heat exchanger can exchange heat between the hydraulic oil in the first circulating pipeline and the air conditioner water in the second circulating pipeline; the second heat exchanger is connected with the circulating water path of the pump station cooling unit through a third circulating pipeline, and the second heat exchanger can exchange heat between the hydraulic oil in the first circulating pipeline and the cooling water in the third circulating pipeline.

[0008] The warm air conditioner is also an indispensable equipment in many factories, especially in cold seasons such as winter to provide heating for the factory, guarantee the comfortable working environment of workers and the good working state of equipment; the warm air conditioner used in the factory usually adopts a large water heating air conditioner; the centralized oil supply hydraulic pump station and the warm air conditioner are both equipment with high energy consumption in the factory, and the factory needs to pay a large amount of fees for the use of the two every year.

[0009] In order to realize energy saving and emission reduction, the technical scheme in the application recovers and utilizes the heat energy generated by the centralized oil supply hydraulic pump station in winter, and creatively introduces a heat energy recovery system on the basis of the original pump station cooling unit. The first heat exchanger exchanges heat between the high-temperature hydraulic oil and the warm air conditioner warm water, and the heat is transferred from the hydraulic oil to the warm air conditioner warm water. The second heat exchanger exchanges heat between the high-temperature hydraulic oil and the cooling water of the pump station cooling unit, and the heat is transferred from the hydraulic oil to the cooling water of the pump station cooling unit. In the winter mode, the centralized oil supply hydraulic pump station can automatically close the pump station cooling unit, and uses the air conditioner water from the warm air conditioner for cooling. The air conditioner water delivered by the warm air conditioner completes the cooling of the hydraulic oil in the first heat exchanger. After the air conditioner water absorbs heat energy and the temperature rises, it returns to the heat dissipation coil of the warm air conditioner, completes the delivery of heat energy from the centralized oil supply hydraulic pump station to the warm air conditioner, and further provides heating for the factory. By adopting the above technical scheme, the function of recycling the heat energy generated by the centralized oil supply hydraulic pump station to the warm air conditioner for heating the factory in winter is realized, which not only saves the energy consumption of the pump station cooling unit, but also reduces the energy consumption of the warm air conditioner, reduces the waste of heat energy of the centralized oil supply hydraulic pump station, achieves the goal of energy saving and emission reduction, green environmental protection, and greatly reduces the cost expenditure of the factory.

[0010] Optionally, the first heat exchanger and the second heat exchanger are connected in series on the first circulating pipeline, and an oil pump and a first safety overflow valve are arranged on the first circulating pipeline.

[0011] When the temperature of the hydraulic oil in the hydraulic oil tank of the centralized oil supply hydraulic pump station exceeds 50℃, the oil pump is started to pump the high-temperature hydraulic oil in the hydraulic oil tank, which sequentially passes through the first heat exchanger and the second heat exchanger and then flows back into the hydraulic oil tank. When the temperature of the hydraulic oil in the hydraulic oil tank is lower than 40℃, the oil pump stops working to ensure that the temperature of the hydraulic oil is constant between 40℃ and 50℃. In the present application, a first safety overflow valve is also provided, which serves as a safety protection device. When the pressure of the hydraulic oil exceeds the safety pressure, the first safety overflow valve timely overflows to protect the entire heat energy recovery system.

[0012] Optionally, the first circulating pipeline comprises an oil outlet pipe connected to the oil outlet of the hydraulic oil tank and an oil return pipe connected to the oil inlet of the hydraulic oil tank; the oil outlet of the oil outlet pipe is connected to the oil inlet of the first heat exchanger, the oil inlet of the oil return pipe is connected to the oil outlet of the second heat exchanger, and the oil outlet of the first heat exchanger is connected to the oil inlet of the second heat exchanger through a series pipe; the series pipe is provided with a first thermometer and a first pressure gauge, and the oil return pipe is provided with a second thermometer and a second pressure gauge.

[0013] Through the above technical solution, the design of the first circulating pipeline ensures that the hydraulic oil can smoothly flow between the first heat exchanger and the second heat exchanger, thereby effectively realizing heat exchange. When the first heat exchanger can meet the cooling demand of the hydraulic oil, the pump station cooling unit can not work; when the temperature of the hydraulic oil is relatively high and the first heat exchanger cannot meet the cooling demand of the hydraulic oil, the pump station cooling unit works simultaneously and utilizes the second heat exchanger to participate in the heat exchange and cooling process of the hydraulic oil. Through the above structural design, the efficient and stable cooling of the hydraulic oil can be ensured, and the selection is more flexible, thereby ensuring the continuity and stability of the hydraulic oil between different heat exchangers. In the present application, the first thermometer and the first pressure gauge are provided to monitor the temperature and pressure changes in the series pipe in real time, thereby ensuring the safety and reliability of the system operation. The second thermometer and the second pressure gauge are provided to monitor the temperature and pressure conditions in the oil return pipe, thereby further ensuring the stable operation of the system.

[0014] Optionally, the oil pump is located on the oil outlet pipe, and a one-way valve is further provided on the oil outlet pipe and located between the oil pump and the first heat exchanger.

[0015] Through the above technical solution, the hydraulic oil can be effectively ensured to be smoothly delivered from the hydraulic oil tank to the first heat exchanger, thereby improving the heat exchange efficiency. The one-way valve is located between the oil pump and the first heat exchanger to prevent the backflow of the hydraulic oil, thereby ensuring the stability and safety of the system.

[0016] Optionally, an overflow pipe is in communication between the oil outlet pipe and the oil return pipe, and the first safety overflow valve is arranged on the overflow pipe, and a third thermometer and a third pressure gauge are further arranged on the overflow pipe.

[0017] By adopting the above technical solutions, the overflow pipe between the oil outlet pipe and the oil return pipe and the first safety overflow valve can effectively prevent the system pressure from being too high, and ensure the safe and stable operation of the system. At the same time, when the hydraulic oil pressure exceeds the set value, the hydraulic oil discharged by pressure relief can be directly returned to the hydraulic oil tank of the centralized oil supply hydraulic pump station, preventing leakage. The third thermometer and the third pressure gauge on the overflow pipe can monitor the temperature and pressure in the overflow pipe in real time, facilitating timely adjustment of system parameters and ensuring normal operation of the system.

[0018] Optionally, a first water pump, a first proportional water valve and a second safety overflow valve are arranged on the circulating water circuit of the air heating air conditioner, and a fourth thermometer and a fourth pressure gauge are further arranged on the circulating water circuit of the air heating air conditioner; a second water pump, a second proportional water valve and a third safety overflow valve are arranged on the circulating water circuit of the pump station cooling unit, and a fifth thermometer and a fifth pressure gauge are further arranged on the circulating water circuit of the pump station cooling unit.

[0019] By adopting the above technical solutions, the application of the first water pump and the first proportional water valve ensures that the water quantity in the circulating water circuit of the air heating air conditioner can be accurately controlled according to actual needs, improves the heat recovery efficiency, and also guarantees the stability and safety of the system. The cooling circulating water in the circulating water circuit of the air heating air conditioner is pumped to the first heat exchanger for heat exchange by the first water pump and the first proportional water valve, and then the high-temperature water flows back to the air heating air conditioner. The second water pump and the second proportional water valve are used for the circulating water circuit of the pump station cooling unit, which can be quickly started when the hydraulic oil temperature is too high, so as to ensure that the temperature of the hydraulic oil is maintained within a suitable range, avoiding the influence of too high temperature on the normal operation of the equipment. The fourth thermometer and the fourth pressure gauge can monitor the temperature and pressure changes in the circulating water circuit of the air heating air conditioner in real time, facilitating timely adjustment of system parameters, improving the response speed and control accuracy of the system. The fifth thermometer and the fifth pressure gauge are used to monitor the state of the circulating water circuit of the pump station cooling unit, ensuring the smoothness of the cooling water circuit, discovering and handling possible fault points in time, and prolonging the service life of the system. The second safety overflow valve limits the water pressure to prevent the cooling circulating water in the circulating water circuit of the air heating air conditioner from overpressure, protecting the water circuit system thereof. The third safety overflow valve prevents the cooling water in the circulating water circuit of the pump station cooling unit from overpressure, protecting the water circuit system thereof.

[0020] Optionally, the first heat exchanger and the second heat exchanger are both plate heat exchangers; and a sixth thermometer is arranged on the hydraulic oil tank of the centralized oil supply hydraulic pump station.

[0021] By adopting the technical scheme, heat exchange efficiency is improved, and heat in the hydraulic oil can be efficiently transferred to the warm air conditioner and the pump station cooling unit. The sixth thermometer arranged on the hydraulic oil tank can monitor the temperature of the hydraulic oil in real time, so that the temperature of the hydraulic oil is ensured to be within a reasonable range, and damage of the system caused by overheating is avoided.

[0022] Optionally, the circulating water path of the warm air conditioner is further provided with a pressure expansion tank and a water supplement pipe, and the water supplement pipe is provided with a normal pressure tank and a vacuum exhaust tank.

[0023] By adopting the technical scheme, the pressure of the circulating water path of the warm air conditioner can be effectively maintained to be stable, and reliable operation of the system is ensured. The pressure expansion tank can be used to adjust the volume expansion of water caused by temperature change, so that the water path system is prevented from being damaged due to pressure fluctuation; the water supplement pipe is used to supplement the water loss in the system due to evaporation or other reasons, and air in the system is discharged to prevent air blockage from occurring, and heat exchange efficiency and stability of the system are improved.

[0024] In summary, the present application has at least one of the following beneficial technical effects:

[0025] 1. The technical scheme in the present application realizes efficient recovery and transmission of waste heat generated by the central oil supply hydraulic pump station to the warm air conditioner for factory heating in winter, effectively avoids energy waste of the traditional cooling system in winter, significantly reduces energy consumption of the warm air conditioner, and achieves the purpose of energy saving and emission reduction.

[0026] 2. The factory heat recovery system in the present application not only saves the energy consumption required when the pump station cooling unit is running, but also reduces the energy consumption of the warm air conditioner, greatly reduces the operation and maintenance cost of the factory, and further reduces the carbon emission per unit output value. Through analysis of actual operation data, the heat recovery system can save 69% of the energy consumption of the pump station system, and realizes the goals of energy saving and emission reduction and green environmental protection.

[0027] 3. The first heat exchanger and the second heat exchanger are arranged in series in the present application, the waste heat of the central oil supply hydraulic pump station can be recovered to the warm air conditioner first, if the power generated by the waste heat exceeds the waste heat recovery power of the warm air conditioner, the pump station cooling unit is started to cool the hydraulic oil, the waste heat is utilized, and efficient and stable cooling of the hydraulic oil is also ensured, and the selection is more flexible and reliable. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a schematic view of the factory heat recovery system in the present application.

[0029] Figure 2 is a water circulation schematic view of the warm air conditioner in the present application.

[0030] Figure 3 is Figure 2Fig. 2 is a partial enlarged view of Fig. 1.

[0031] Fig. 1 is a schematic view of a heat pump system according to an embodiment of the present application.

[0032] 10, centralized oil supply hydraulic pump station; 11, hydraulic oil tank; 111, sixth thermometer;

[0033] 20, air conditioner with heating function;

[0034] 30, pump station cooling unit;

[0035] 40, first heat exchanger;

[0036] 50, second heat exchanger;

[0037] 60, first circulation pipeline; 61, oil outlet pipe; 611, oil pump; 612, one-way valve; 62, oil return pipe; 621, second thermometer; 622, second pressure gauge; 63, series pipe; 631, first thermometer; 632, first pressure gauge; 64, overflow pipe; 641, first safety overflow valve; 642, third thermometer; 643, third pressure gauge;

[0038] 70, second circulation pipeline; 71, first water pump; 72, first proportional water valve; 73, second safety overflow valve; 74, fourth thermometer; 75, fourth pressure gauge; 76, pressure expansion tank; 77, water supply pipe; 771, normal pressure tank; 772, vacuum exhaust tank;

[0039] 80, third circulation pipeline; 81, second water pump; 82, second proportional water valve; 83, third safety overflow valve; 84, fifth thermometer; 85, fifth pressure gauge. DETAILED DESCRIPTION

[0040] The following will be combined with the accompanying drawings Figure 1 - the accompanying drawings Figure 3 In order to make the technical scheme in the embodiments of the present application clear and complete, the described embodiments are only possible technical implementations of the present application, and are not all possible implementations. Those skilled in the art can combine the embodiments of the present application without creative labor to obtain other embodiments, and these embodiments are also within the protection scope of the present application.

[0041] In steel plant, power plant and hydraulic parts production enterprises, centralized oil supply hydraulic pump station 10 and warm air conditioning 20 are indispensable equipment in the factory, centralized oil supply hydraulic pump station 10 provides hydraulic power as the power source of production or test, warm air conditioning 20 provides heating for the factory in winter and cold season, guarantees the comfortable working environment of workers and the good working condition of equipment; Warm air conditioning 20 used in the factory usually adopts large water heating air conditioner; Centralized oil supply hydraulic pump station 10 and warm air conditioning 20 are both equipment with high energy consumption in the factory, and the factory needs to pay a large amount of fees for the use of the two every year. In this application, the two are combined to utilize waste heat, achieve the purpose of energy saving and emission reduction, and effectively reduce the operating cost of the factory.

[0042] Referring to Figure 1 The factory heat energy recovery system in this application includes centralized oil supply hydraulic pump station 10, warm air conditioning 20, pump station cooling unit 30, first heat exchanger 40 and second heat exchanger 50; The first heat exchanger 40 and the second heat exchanger 50 in this embodiment can be plate heat exchangers. The centralized oil supply hydraulic pump station 10 includes motor pump group, hydraulic oil tank 11, circulating filtration system, electrical control system and the like, the temperature of hydraulic oil in the hydraulic oil tank 11 of the centralized oil supply hydraulic pump station 10 usually needs to be controlled between 40℃-50℃, so as to have the best use effect. When the temperature of hydraulic oil rises due to heat absorption in the use process, the hydraulic oil needs to be continuously cooled, so as to control the temperature of hydraulic oil in the reasonable working interval.

[0043] Referring to Figure 1As shown, the hydraulic oil tank 11 of the centralized oil supply hydraulic pump station 10 in the present application delivers hydraulic oil out of the hydraulic oil tank 11 through the first circulating pipeline 60, and then delivers the cooled hydraulic oil back into the hydraulic oil tank 11. The first circulating pipeline 60 includes an oil outlet pipe 61, an oil return pipe 62 and a series pipe 63. The oil inlet end of the oil outlet pipe 61 is connected to the oil outlet of the hydraulic oil tank 11. The oil outlet of the oil outlet pipe 61 is connected to the oil inlet of the first heat exchanger 40. The oil inlet end of the series pipe 63 is connected to the oil outlet of the first heat exchanger 40. The oil outlet end of the series pipe 63 is connected to the oil inlet of the second heat exchanger 50. The oil inlet end of the oil return pipe 62 is connected to the oil outlet of the second heat exchanger 50. The oil outlet end of the oil return pipe 62 is connected to the oil inlet of the hydraulic oil tank 11. In this way, the first heat exchanger 40 and the second heat exchanger 50 are connected in series on the first circulating pipeline 60. An oil pump 611 is arranged on the oil outlet pipe 61. The oil pump 611 can effectively ensure that the hydraulic oil is smoothly delivered from the hydraulic oil tank 11 to the first heat exchanger 40, thereby improving the heat exchange efficiency. A one-way valve 612 is arranged between the oil pump 611 and the first heat exchanger 40 on the oil outlet pipe 61. The one-way valve 612 is used to prevent backflow of the hydraulic oil, thereby ensuring the stability and safety of the system. An overflow pipe 64 is connected between the oil outlet pipe 61 and the oil return pipe 62. A first safety overflow valve 641 is arranged on the overflow pipe 64. The overflow pipe 64 and the first safety overflow valve 641 can effectively prevent the system pressure from being too high, thereby ensuring safe and stable operation of the system. When the hydraulic oil pressure exceeds the set value, the hydraulic oil that is released through overflow can be directly returned to the hydraulic oil tank 11 of the centralized oil supply hydraulic pump station 10, thereby preventing leakage.

[0044] Referring to Figure 1 and Figure 2 As shown, the first heat exchanger 40 is connected to the circulating water path of the warm air air conditioner 20 through the second circulating pipeline 70. The first heat exchanger 40 can perform heat exchange between the hydraulic oil in the first circulating pipeline 60 and the air conditioner water in the second circulating pipeline 70. The second heat exchanger 50 is connected to the circulating water path of the pump station cooling unit 30 through the third circulating pipeline 80. The second heat exchanger 50 can perform heat exchange between the hydraulic oil in the first circulating pipeline 60 and the cooling water in the third circulating pipeline 80.

[0045] Referring to Figure 1As shown, the series pipe 63 in the embodiment is provided with a first thermometer 631 and a first pressure gauge 632, which can monitor the temperature and pressure changes in the series pipe 63 in real time, ensuring the safety and reliability of the system operation. The oil return pipe 62 is provided with a second thermometer 621 and a second pressure gauge 622, which are used to monitor the temperature and pressure of the oil return pipe 62 in real time, further ensuring the stable operation of the system. The overflow pipe 64 is also provided with a third thermometer 642 and a third pressure gauge 643, which are located between the first safety overflow valve 641 and the oil outlet pipe 61, used to detect the oil pressure and temperature of the hydraulic oil before entering the first heat exchanger 40. When the oil pressure is too high, the pressure can be released through the overflow pipe 64 and the first safety overflow valve 641, ensuring the normal operation of the system.

[0046] Referring to Figure 1 As shown, the second circulating pipe 70 is provided with a first water pump 71, a first proportional water valve 72, a second safety overflow valve 73, a fourth thermometer 74 and a fourth pressure gauge 75; the third circulating pipe 80 is provided with a second water pump 81, a second proportional water valve 82, a third safety overflow valve 83, a fifth thermometer 84 and a fifth pressure gauge 85. The hydraulic oil tank 11 of the centralized oil supply hydraulic pump station 10 is provided with a sixth thermometer 111. The application of the first water pump 71 and the first proportional water valve 72 ensures that the amount of water in the circulating water circuit of the warm air conditioner 20 can be accurately controlled according to the actual demand, improves the heat recovery efficiency, and also ensures the stability and safety of the system. The cooling circulating water in the circulating water circuit of the warm air conditioner 20 is pumped to the first heat exchanger 40 for heat exchange through the first water pump 71 and the first proportional water valve 72, and then the high-temperature water flows back to the warm air conditioner 20. The second water pump 81 and the second proportional water valve 82 are used for the circulating water circuit of the pump cooling unit 30, which can be quickly started when the hydraulic oil temperature is too high, ensuring that the temperature of the hydraulic oil is maintained within a suitable range, avoiding the influence of high temperature on the normal operation of the equipment. The setting of the fourth thermometer 74 and the fourth pressure gauge 75 can monitor the temperature and pressure changes in the circulating water circuit of the warm air conditioner 20 in real time, so as to adjust the system parameters in time, improve the response speed and control accuracy of the system. The fifth thermometer 84 and the fifth pressure gauge 85 are used to monitor the state of the circulating water circuit of the pump cooling unit 30, ensuring the smoothness of the cooling water circuit, discovering and handling possible fault points in time, and prolonging the service life of the system. The second safety overflow valve 73 limits the water pressure to prevent the cooling circulating water in the circulating water circuit of the warm air conditioner 20 from overpressure, protecting its water circuit system. The third safety overflow valve 83 prevents the cooling water in the circulating water circuit of the pump cooling unit 30 from overpressure, protecting its water circuit system. In this application, the sixth thermometer 111 is used to monitor the temperature of the hydraulic oil in real time, ensuring that the temperature of the hydraulic oil is within a reasonable range, avoiding overheating and causing damage to the system.

[0047] Referring to Figure 2 and Figure 3 As shown, the second circulating pipeline 70 is further provided with a pressure expansion tank 76 and a water supplement pipeline 77, the water supplement pipeline 77 is provided with a normal pressure tank 771 and a vacuum exhaust tank 772, the water supplement pipeline 77 can supplement the softened water in an isolated manner, the pressure during water supplement is not less than 1.3 bar, which can effectively maintain the pressure stability of the circulating water circuit of the warm air conditioner 20 and ensure the reliable operation of the system. The pressure expansion tank 76 can be used to adjust the water volume expansion caused by temperature change, so as to avoid the damage of the water circuit system due to pressure fluctuation; the water supplement pipeline 77 is used to supplement the water loss in the system due to evaporation or other reasons, while the air in the system is exhausted to prevent air blockage and improve the heat exchange efficiency and stability of the system.

[0048] The implementation principle is as follows: in order to realize energy saving and emission reduction, in winter, the heat energy generated by the centralized oil supply hydraulic pump station 10 is recycled, and the technical solution in the application creatively introduces a heat energy recovery system on the basis of the original pump station cooling unit 30. The first heat exchanger 40 exchanges heat between the high-temperature hydraulic oil and the warm air conditioner 20 warm water, and the heat is transferred from the hydraulic oil to the warm air conditioner 20 warm water. The second heat exchanger 50 exchanges heat between the high-temperature hydraulic oil and the cooling water of the pump station cooling unit 30, and the heat is transferred from the hydraulic oil to the cooling water of the pump station cooling unit 30. The first circulating pipeline 60 ensures that the hydraulic oil can flow smoothly between the first heat exchanger 40 and the second heat exchanger 50, thereby effectively realizing heat exchange. When the first heat exchanger 40 can meet the cooling demand of the hydraulic oil, the pump station cooling unit 30 can not work; when the temperature of the hydraulic oil is relatively high and the first heat exchanger 40 cannot meet the cooling demand of the hydraulic oil, the pump station cooling unit 30 works at the same time and participates in the heat exchange and cooling process of the hydraulic oil by using the second heat exchanger 50. In winter mode, the centralized oil supply hydraulic pump station 10 can usually automatically close the pump station cooling unit 30, and use the air conditioner water from the warm air conditioner 20 for cooling. The air conditioner water delivered from the warm air conditioner 20 completes the cooling of the hydraulic oil in the first heat exchanger 40. After the air conditioner water absorbs heat energy and the temperature rises, it returns to the heat dissipation coil of the warm air conditioner 20, completes the delivery of heat energy from the centralized oil supply hydraulic pump station 10 to the warm air conditioner 20, and further heats the factory. The function of recycling the heat energy generated by the centralized oil supply hydraulic pump station 10 to the warm air conditioner 20 for factory heating in winter is realized, which not only saves the energy consumption of the pump station cooling unit 30, but also reduces the energy consumption of the warm air conditioner 20, reduces the waste of heat energy of the centralized oil supply hydraulic pump station 10, achieves the goal of energy saving and emission reduction, green environmental protection, and greatly reduces the factory cost expenditure.

[0049] The factory heat energy recovery system in the application, when in use, when the temperature of the hydraulic oil in the hydraulic oil tank 11 of the centralized oil supply hydraulic pump station 10 is detected to be higher than 50 DEG C, the oil pump 611 is started to pump the high-temperature hydraulic oil in the hydraulic oil tank 11, which sequentially passes through the first heat exchanger 40 and the second heat exchanger 50, and then flows back into the hydraulic oil tank 11. When the temperature of the hydraulic oil in the hydraulic oil tank 11 is lower than 40 DEG C, the oil pump 611 stops working, so as to ensure that the temperature of the hydraulic oil is constant between 40 DEG C and 50 DEG C. When the factory scale is large, the power demand of the centralized oil supply hydraulic pump station 10 and the warm air air conditioner 20 is large, and the corresponding heat exchange power requirement is high, and a plurality of groups of the first heat exchanger 40 in series or parallel can be arranged for heat exchange.

[0050] The embodiments of the specific implementation are the preferred embodiments of the application, and are not limited to the protection scope of the application, wherein the same parts are indicated by the same reference numerals. Therefore: any equivalent changes made according to the structure, shape, principle of the application should be covered in the protection scope of the application.

Claims

1. A plant heat recovery system, characterized by, The application relates to a centralized oil supply hydraulic pump station (10), a warm air conditioner (20), a pump station cooling unit (30), a first heat exchanger (40) and a second heat exchanger (50); a hydraulic oil tank (11) of the centralized oil supply hydraulic pump station (10) is connected with the first heat exchanger (40) and the second heat exchanger (50) through first circulating pipelines (60) respectively; the first heat exchanger (40) is connected with a circulating water path of the warm air conditioner (20) through second circulating pipelines (70), and the first heat exchanger (40) can exchange heat between hydraulic oil in the first circulating pipelines (60) and air conditioner water in the second circulating pipelines (70); the second heat exchanger (50) is connected with a circulating water path of the pump station cooling unit (30) through third circulating pipelines (80), and the second heat exchanger (50) can exchange heat between hydraulic oil in the first circulating pipelines (60) and cooling water in the third circulating pipelines (80).

2. The plant heat recovery system of claim 1, wherein, The first heat exchanger (40) and the second heat exchanger (50) are connected in series on the first circulating pipelines (60), and an oil pump (611) and a first safety overflow valve (641) are arranged on the first circulating pipelines (60).

3. The plant heat recovery system of claim 2, wherein, The first circulating pipelines (60) comprise an oil outlet pipeline (61) connected with an oil outlet of the hydraulic oil tank (11) and an oil return pipeline (62) connected with an oil inlet of the hydraulic oil tank (11); an oil outlet of the oil outlet pipeline (61) is connected with an oil inlet of the first heat exchanger (40), an oil inlet of the oil return pipeline (62) is connected with an oil outlet of the second heat exchanger (50), and an oil outlet of the first heat exchanger (40) is connected with an oil inlet of the second heat exchanger (50) through a series pipeline (63); a first thermometer (631) and a first pressure gauge (632) are arranged on the series pipeline (63), and a second thermometer (621) and a second pressure gauge (622) are arranged on the oil return pipeline (62).

4. The plant heat recovery system of claim 3, wherein, The oil pump (611) is arranged on the oil outlet pipeline (61), and a one-way valve (612) is further arranged on the oil outlet pipeline (61) and located between the oil pump (611) and the first heat exchanger (40).

5. The plant heat recovery system of claim 3, wherein, An overflow pipeline (64) is connected between the oil outlet pipeline (61) and the oil return pipeline (62), the first safety overflow valve (641) is arranged on the overflow pipeline (64), and a third thermometer (642) and a third pressure gauge (643) are further arranged on the overflow pipeline (64).

6. The plant heat recovery system of claim 1, wherein, A first water pump (71), a first proportional water valve (72) and a second safety overflow valve (73) are arranged on a circulating water path of the warm air conditioner (20), and a fourth thermometer (74) and a fourth pressure gauge (75) are further arranged on the circulating water path of the warm air conditioner (20); a second water pump (81), a second proportional water valve (82) and a third safety overflow valve (83) are arranged on a circulating water path of the pump station cooling unit (30), and a fifth thermometer (84) and a fifth pressure gauge (85) are further arranged on the circulating water path of the pump station cooling unit (30).

7. The plant heat recovery system of claim 1, wherein, The first heat exchanger (40) and the second heat exchanger (50) are both plate heat exchangers; a sixth thermometer (111) is arranged on the hydraulic oil tank (11) of the centralized oil supply hydraulic pump station (10).

8. The plant heat recovery system of claim 6, wherein, The circulating water path of the warm air conditioner (20) is further provided with a pressure expansion tank (76) and a water supplement pipe (77), and the water supplement pipe (77) is provided with a normal pressure tank (771) and a vacuum exhaust tank (772).

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