High-temperature steam heat pump external intelligent cooling and heat recovery system and control method

Abstract

The invention discloses an external intelligent cooling and heat recovery system of a high-temperature steam heat pump and a control method, and relates to the technical field of heat pumps, the external intelligent cooling and heat recovery system of the high-temperature steam heat pump comprises a waste heat system, a high-temperature steam heat pump system, a cooling and heat recovery system, an internal cooling oil system and a controller; a working medium of the high-temperature steam heat pump system exchanges heat with waste heat fluid of the waste heat system through a heat pump evaporator; the internal cooling oil system is used for providing cooling oil for the high-temperature steam heat pump system; the cooling and heat recovery system is used for cooling cooling oil of the internal cooling oil system, and medium water of the cooling and heat recovery system exchanges heat with waste heat fluid of the waste heat system through the first heat exchanger and then is transmitted to the heat pump condensation evaporator. The waste heat system, the high-temperature steam heat pump system, the cooling and heat recovery system and the internal cooling oil system are all in communication connection with the controller. According to the technical scheme, the utilization rate of waste heat fluid heat can be increased.

Description

Technical Field

[0001] This invention relates to the field of heat pump technology, and in particular to an external intelligent cooling and heat recovery system and control method for a high-temperature steam heat pump. Background Technology

[0002] With increasing global focus on energy conservation, emission reduction, and sustainable development, the application of heat pump energy-saving technology in industrial and residential sectors is becoming increasingly important. Within the field of heat pump energy-saving technology, high-temperature steam heat pump systems, as highly efficient energy conversion devices, have seen performance optimization and energy recovery become key research directions. However, current high-temperature steam heat pump systems primarily rely on a single heat exchange between the evaporator and the waste water system for waste heat recovery. This lack of flexible system dynamic adjustment and refined heat recovery mechanisms results in low efficiency in recovering low-grade waste heat energy, and a significant amount of residual heat energy carried by the waste water after heat exchange is wasted, severely limiting the improvement of the overall system energy utilization rate. Summary of the Invention

[0003] The main objective of this invention is to propose an external intelligent cooling and heat recovery system and control method for a high-temperature steam heat pump, which aims to improve the utilization rate of waste heat fluid heat.

[0004] To achieve the above objectives, the present invention proposes an external intelligent cooling and heat recovery system for a high-temperature steam heat pump, comprising a waste heat system, a high-temperature steam heat pump system, a cooling and heat recovery system, an internal cooling oil system, and a controller. The waste heat system includes a waste heat inlet pipe, a heat pump evaporator, a first waste heat outlet pipe, a first heat exchanger, and a second waste heat outlet pipe connected in sequence. The high-temperature steam heat pump system includes a heat pump evaporator, a first heat pump connecting pipe, a heat pump compressor, a second heat pump connecting pipe, a heat pump condenser-evaporator, and a third heat pump connecting pipe connected in sequence. The third heat pump connecting pipe is connected to the heat pump evaporator. The working fluid of the high-temperature steam heat pump system exchanges heat with the waste heat fluid of the waste heat system through the heat pump evaporator. The internal cooling oil system is used to provide cooling oil for the high-temperature steam heat pump system; The cooling and heat recovery system is used to cool the cooling oil of the internal cooling oil system. The medium water of the cooling and heat recovery system is transferred to the heat pump condenser-evaporator after exchanging heat with the waste heat fluid of the waste heat system through the first heat exchanger. The waste heat system, the high-temperature steam heat pump system, the cooling and heat recovery system, and the internal cooling oil system are all communicatively connected to the controller.

[0005] In one embodiment, the high-temperature steam heat pump system further includes a fourth heat pump connecting pipe, a heat pump flash evaporator, a fifth heat pump connecting pipe, and a sixth heat pump connecting pipe. The fourth heat pump connecting pipe connects the heat pump condenser-evaporator and the heat pump flash evaporator. The fifth heat pump connecting pipe connects the heat pump flash evaporator and the heat pump compressor. The sixth heat pump connecting pipe connects the heat pump flash evaporator and the heat pump evaporator.

[0006] In one embodiment, a one-way valve is provided on the second heat pump connecting pipe; The third heat pump connecting pipe is equipped with a first heat pump expansion valve; The fourth heat pump connecting pipe is equipped with a second heat pump expansion valve; The sixth heat pump connecting pipe is equipped with a third heat pump expansion valve.

[0007] In one embodiment, the high-temperature steam heat pump system further includes a heat pump wastewater pipe and a heat pump wastewater valve, wherein the heat pump wastewater pipe is connected to the heat pump condenser-evaporator, and the heat pump wastewater valve is located on the heat pump wastewater pipe.

[0008] In one embodiment, the high-temperature steam heat pump external intelligent cooling and heat recovery system further includes an external medium water system, which includes a first pipe, a purifier, a second pipe, an insulated water tank, and a third pipe connected in sequence. The insulated water tank is used to provide medium water for the cooling and heat recovery system.

[0009] In one embodiment, the insulated water tank is equipped with a water tank level gauge, and the third pipe is equipped with an electrically controlled drain valve. Both the water tank level gauge and the electrically controlled drain valve are communicatively connected to the controller.

[0010] In one embodiment, the cooling and heat recovery system includes a first heat exchanger, a heat pump condenser-evaporator, an insulated water tank, a fourth pipe, a first electrically controlled three-way flow regulating valve, a fifth pipe, a first oil cooler, a sixth pipe, a seventh pipe, a second oil cooler, an eighth pipe, a ninth pipe, a second electrically controlled three-way flow regulating valve, a tenth pipe, an eleventh pipe, a twelfth pipe, and a steam pipe. The fourth pipe connects the insulated water tank and the first electrically controlled three-way flow regulating valve; the fifth pipe connects the first electrically controlled three-way flow regulating valve and the first oil cooler; the sixth pipe connects the first oil cooler and the ninth pipe; the seventh pipe connects the first electrically controlled three-way flow regulating valve and the second oil cooler; the eighth pipe connects the second oil cooler and the ninth pipe; the ninth pipe connects to the second electrically controlled three-way flow regulating valve; the tenth pipe connects the second electrically controlled three-way flow regulating valve and the insulated water tank; the eleventh pipe connects the second electrically controlled three-way flow regulating valve and the first heat exchanger; the twelfth pipe connects the first heat exchanger and the heat pump condenser-evaporator; and the steam pipe is located in the heat pump condenser-evaporator. Both the first electrically controlled three-way flow regulating valve and the second electrically controlled three-way flow regulating valve are communicatively connected to the controller.

[0011] In one embodiment, a circulating water pump is provided on the fourth pipeline, a condenser-evaporator level gauge is provided inside the heat pump condenser-evaporator, and an electrically controlled flow regulating valve is provided on the steam pipeline. Both the condenser-evaporator level gauge and the electrically controlled flow regulating valve are communicatively connected to the controller.

[0012] In one embodiment, the internal cooling oil system includes the heat pump compressor, the heat pump motor, the heat pump condenser-evaporator, the oil tank, the first oil cooler, the second oil cooler, the oil pump, the first oil pipe, the second oil pipe, the third oil pipe, the fourth oil pipe, and the fifth oil pipe. The first oil pipe connects the oil tank and the first oil cooler. The oil pump is located on the first oil pipe. The second oil pipe connects the first oil cooler and the heat pump compressor. The heat pump compressor is connected to the heat pump motor. The third oil pipe connects the heat pump condenser-evaporator and the second oil cooler. The fourth oil pipe connects the second oil cooler and the heat pump motor. The fifth oil pipe connects the heat pump motor and the oil tank.

[0013] This invention also proposes a method for controlling the external intelligent cooling and heat recovery of a high-temperature steam heat pump, applied to the high-temperature steam heat pump external intelligent cooling and heat recovery system described above. The control method includes: The working fluid of the high-temperature steam heat pump system is controlled to flow into the heat pump evaporator and the waste heat system for heat exchange. The working fluid after heat exchange flows into the heat pump compressor for compression. Control the flow of the compressed working fluid into the heat pump condenser-evaporator; The medium water of the cooling and heat recovery system is controlled to flow into the first heat exchanger to exchange heat with the waste heat fluid of the waste heat system; The heat-exchanged medium water flows into the heat pump condenser-evaporator and exchanges heat with the compressed working fluid to generate steam.

[0014] In the technical solution of this invention, after the waste heat fluid of the waste heat system exchanges heat with the working fluid of the heat pump evaporator and the high-temperature steam heat pump system, it also exchanges heat with the medium water of the first heat exchanger and the cooling and heat recovery system, thereby improving the utilization rate of the waste heat fluid's heat. Furthermore, the medium water of the cooling and heat recovery system absorbs heat from the cooling oil of the internal cooling oil system before heat exchange, resulting in a relatively higher temperature when it flows into the heat pump condenser-evaporator after heat exchange, making it easier to generate steam. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 A schematic diagram of an embodiment of the high-temperature steam heat pump external intelligent cooling and heat recovery system provided by the present invention; Figure 2 This is a schematic diagram of an embodiment of the high-temperature steam heat pump system provided by the present invention.

[0017] Explanation of icon numbers: 11. Waste heat inlet pipe; 12. First waste heat outlet pipe; 13. First heat exchanger; 14. Second waste heat outlet pipe; 21. Heat pump evaporator; 22. First heat pump connecting pipe; 23. Heat pump compressor; 24. Heat pump motor; 25. One-way valve; 26. Second heat pump connecting pipe; 27. Heat pump condenser-evaporator; 28. Third heat pump connecting pipe; 29. ​​First heat pump expansion valve; 30. Second heat pump expansion valve; 31. Fourth heat pump connecting pipe; 32. Heat pump flash evaporator; 33. Fifth heat pump connecting pipe; 34. Sixth heat pump connecting pipe; 35. Third heat pump expansion valve; 36. Heat pump wastewater pipe; 37. Heat pump wastewater valve; 41. First pipeline; 42. Purifier; 43. Second pipeline; 44. Insulated water tank; 45. 46. ​​Electrically controlled drain valve; 47. Third pipe; 51. Water tank level gauge; 52. Fourth pipe; 53. Circulating water pump; 54. First electrically controlled three-way flow regulating valve; 55. Fifth pipe; 56. First oil cooler; 57. Sixth pipe; 58. Seventh pipe; 59. Second oil cooler; 60. Eighth pipe; 61. Ninth pipe; 62. Second electrically controlled three-way flow regulating valve; 63. Tenth pipe; 64. Eleventh pipe; 65. Twelfth pipe; 66. Steam pipe; 67. Electrically controlled flow regulating valve; 78. Condenser / evaporator level gauge; 79. Oil tank; 70. Oil pump; 71. First oil pipe; 72. Second oil pipe; 73. Third oil pipe; 74. Fourth oil pipe; 75. Fifth oil pipe; 80. Controller.

[0018] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0021] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0022] This invention proposes an external intelligent cooling and heat recovery system for a high-temperature steam heat pump.

[0023] Please see Figure 1 and Figure 2 In one embodiment of the present invention, the external intelligent cooling and heat recovery system of the high-temperature steam heat pump includes a waste heat system, a high-temperature steam heat pump system, a cooling and heat recovery system, an internal cooling oil system, and a controller 80; the waste heat system includes a waste heat inlet pipe 11, a heat pump evaporator 21, a first waste heat outlet pipe 12, a first heat exchanger 13, and a second waste heat outlet pipe 14 connected in sequence; the high-temperature steam heat pump system includes a heat pump evaporator 21, a first heat pump connecting pipe 22, a heat pump compressor 23, a second heat pump connecting pipe 26, a heat pump condenser-evaporator 27, and a third heat pump connecting pipe connected in sequence. 28. The third heat pump connecting pipe 28 is connected to the heat pump evaporator 21. The working fluid of the high-temperature steam heat pump system exchanges heat with the waste heat fluid of the waste heat system through the heat pump evaporator 21. The internal cooling oil system is used to provide cooling oil for the high-temperature steam heat pump system. The cooling and heat recovery system is used to cool the cooling oil of the internal cooling oil system. The medium water of the cooling and heat recovery system is transferred to the heat pump condenser evaporator 27 after exchanging heat with the waste heat fluid of the waste heat system through the first heat exchanger 13. The waste heat system, the high-temperature steam heat pump system, the cooling and heat recovery system and the internal cooling oil system are all connected to the controller 80 for communication.

[0024] In the technical solution of this invention, after the waste heat fluid of the waste heat system exchanges heat with the working fluid of the heat pump evaporator 21 and the high-temperature steam heat pump system, it will also exchange heat with the medium water of the first heat exchanger 13 and the cooling and heat recovery system, thereby improving the utilization rate of the waste heat fluid's heat. Furthermore, the medium water of the cooling and heat recovery system absorbs heat from the cooling oil of the internal cooling oil system before heat exchange, and its temperature is relatively higher when it flows into the heat pump condenser-evaporator 27 after heat exchange, making it easier to generate steam.

[0025] Furthermore, in one embodiment of the present invention, please refer to... Figure 2 The high-temperature steam heat pump system also includes a fourth heat pump connecting pipe 31, a heat pump flash evaporator 32, a fifth heat pump connecting pipe 33, and a sixth heat pump connecting pipe 34. The fourth heat pump connecting pipe 31 connects the heat pump condenser-evaporator 27 and the heat pump flash evaporator 32. The fifth heat pump connecting pipe 33 connects the heat pump flash evaporator 32 and the heat pump compressor 23. The sixth heat pump connecting pipe 34 connects the heat pump flash evaporator 32 and the heat pump evaporator 21.

[0026] Furthermore, in one embodiment of the present invention, please refer to... Figure 2 The second heat pump connecting pipe 26 is equipped with a one-way valve 25; the third heat pump connecting pipe 28 is equipped with a first heat pump expansion valve 29; the fourth heat pump connecting pipe 31 is equipped with a second heat pump expansion valve 30; and the sixth heat pump connecting pipe 34 is equipped with a third heat pump expansion valve 35.

[0027] To ensure stable system operation, in one embodiment of the present invention, please refer to... Figure 2 The high-temperature steam heat pump system also includes a heat pump wastewater pipe 36 and a heat pump wastewater valve 37. The heat pump wastewater pipe 36 is connected to the heat pump condenser-evaporator 27, and the heat pump wastewater valve 37 is located on the heat pump wastewater pipe 36. The heat pump wastewater pipe 36 and the heat pump wastewater valve 37 work together to remove the dirt generated during the condensation process.

[0028] Furthermore, in one embodiment of the present invention, please refer to... Figure 1 The high-temperature steam heat pump external intelligent cooling and heat recovery system also includes an external medium water system. This external medium water system comprises a first pipe 41, a purifier 42, a second pipe 43, an insulated water tank 44, and a third pipe 46 connected in sequence. The insulated water tank 44 provides medium water to the cooling and heat recovery system. The insulated water tank 44 is equipped with a water level gauge 47 and a temperature sensor. An electrically controlled drain valve 45 is installed on the third pipe 46. The electrically controlled drain valve 45, the water level gauge 47, and the temperature sensor are all communicatively connected to the controller 80.

[0029] Specifically, in one embodiment of the present invention, please refer to... Figure 1The cooling and heat recovery system includes a first heat exchanger 13, a heat pump condenser / evaporator 27, an insulated water tank 44, a fourth pipe 51, a first electrically controlled three-way flow regulating valve 53, a fifth pipe 54, a first oil cooler 55, a sixth pipe 56, a seventh pipe 57, a second oil cooler 58, an eighth pipe 59, a ninth pipe 60, a second electrically controlled three-way flow regulating valve 61, a tenth pipe 62, an eleventh pipe 63, a twelfth pipe 64, and a steam pipe 65. The fourth pipe 51 connects the insulated water tank 44 and the first electrically controlled three-way flow regulating valve 53; the fifth pipe 54 connects the first electrically controlled three-way flow regulating valve 53 and the first oil cooler 55; and the sixth pipe 56 connects the first oil cooler 58... Pipes 5 and 60, and 57 connect to the first electrically controlled three-way flow regulating valve 53 and the second oil cooler 58. Pipe 59 connects the second oil cooler 58 and pipe 60. Pipe 60 connects to the second electrically controlled three-way flow regulating valve 61. Pipe 62 connects to the second electrically controlled three-way flow regulating valve 61 and the insulated water tank 44. Pipe 63 connects to the second electrically controlled three-way flow regulating valve 61 and the first heat exchanger 13. Pipe 64 connects to the first heat exchanger 13 and the heat pump condenser-evaporator 27. Steam pipe 65 is located in the heat pump condenser-evaporator 27. Both the first electrically controlled three-way flow regulating valve 53 and the second electrically controlled three-way flow regulating valve 61 are communicatively connected to the controller 80.

[0030] Furthermore, in one embodiment of the present invention, please refer to... Figure 1 A circulating water pump 52 is installed on the fourth pipe 51, a condenser level gauge 67 is installed in the heat pump condenser evaporator 27, and an electrically controlled flow regulating valve 66 is installed on the steam pipe 65. The condenser level gauge 67 and the electrically controlled flow regulating valve 66 are both connected to the controller 80.

[0031] Specifically, in one embodiment of the present invention, please refer to... Figure 1 The internal cooling oil system includes a heat pump compressor 23, a heat pump motor 24, a heat pump condenser-evaporator 27, an oil tank 70, a first oil cooler 55, a second oil cooler 58, an oil pump 71, a first oil pipe 72, a second oil pipe 73, a third oil pipe 74, a fourth oil pipe 75, and a fifth oil pipe 76. The first oil pipe 72 connects the oil tank 70 and the first oil cooler 55. The oil pump 71 is located on the first oil pipe 72. The second oil pipe 73 connects the first oil cooler 55 and the heat pump compressor 23. The heat pump compressor 23 is connected to the heat pump motor 24. The third oil pipe 74 connects the heat pump condenser-evaporator 27 and the second oil cooler 58. The fourth oil pipe 75 connects the second oil cooler 58 and the heat pump motor 24. The fifth oil pipe 76 connects the heat pump motor 24 and the oil tank 70.

[0032] To monitor the state of media in different systems in real time, in one embodiment of the present invention, please refer to... Figure 1 and Figure 2The waste heat inlet pipe 11 is equipped with a pressure sensor, a temperature sensor, and a flow meter; the first waste heat outlet pipe 12 is equipped with a temperature sensor; the second waste heat outlet pipe 14 is equipped with a temperature sensor; the fourth pipe 51 is equipped with a pressure sensor, a temperature sensor, and a flow meter; the fifth pipe 54 is equipped with a flow meter; the sixth pipe 56 is equipped with a temperature sensor; the seventh pipe 57 is equipped with a flow meter; the eighth pipe 59 is equipped with a temperature sensor; the eleventh pipe 63 is equipped with a temperature sensor and a flow meter; the twelfth pipe 64 is equipped with a temperature sensor; the steam pipe 65 is equipped with a pressure sensor, a temperature sensor, and a flow meter; the oil tank 70 is equipped with a pressure sensor and a temperature sensor; the second oil pipe 73 is equipped with a temperature sensor; the third oil pipe 74 is equipped with a pressure sensor and a temperature sensor; and the fourth oil pipe 75 is equipped with a pressure sensor and a temperature sensor.

[0033] When the waste heat system starts up, the waste heat fluid enters the heat pump evaporator 21 through the waste heat inlet pipe 11, and its temperature, pressure, and flow rate are monitored in real time by the controller 80. The waste heat fluid transfers heat to the heat pump evaporator 21 of the high-temperature steam heat pump system. The heat pump evaporator 21 absorbs low-grade heat energy, and the waste water energy is further recovered through the first heat exchanger 13. At the same time, it preheats the makeup water of the high-temperature steam heat pump system, thereby improving the overall heat energy utilization efficiency. To ensure the accuracy and stability of the recovery process, temperature sensors are installed before and after the first heat exchanger 13 to monitor and provide feedback on the waste water recovery temperature in real time. The controller 80 makes dynamic adjustments based on the feedback data.

[0034] During operation of the high-temperature steam heat pump system, the working fluid exchanges heat with the waste heat system in the heat pump evaporator 21 and then enters the heat pump compressor 23 through the first heat pump connecting pipe 22, where it is compressed. The compressed high-temperature, high-pressure working fluid is then transported to the heat pump condenser-evaporator 27 through the one-way valve 25 and the second heat pump connecting pipe 26, where condensation and heat exchange occur. During condensation, the working fluid releases heat during condensation inside the pipe, while water outside the pipe absorbs heat and evaporates, ultimately generating high-temperature steam. The condensate after condensation flows back in two paths: one path flows directly back to the heat pump evaporator 21 through the first heat pump expansion valve 29 and the third heat pump connecting pipe 28, forming a closed loop of the high-temperature steam heat pump, which is the main loop loop; the other path flows through the fourth heat pump connecting pipe 31 and the second heat pump expansion valve 30 into the heat pump flash evaporator 32, where it flashes. The resulting flash gas enters the heat pump compressor 23 through the fifth heat pump connecting pipe 33, providing replenishment gas for the heat pump compressor 23; the flashed liquid then flows back to the heat pump evaporator 21 after expanding through the third heat pump expansion valve 35 via the sixth heat pump connecting pipe 34, forming a complete loop.

[0035] When the external medium water system is running, tap water is transported through the first pipe 41 to the purifier 42 for purification, then enters the second pipe 43 and is stored in the insulated water tank 44. The insulated water tank 44 is equipped with a water level gauge 47 and a temperature sensor to monitor the liquid level and temperature parameters in real time and transmit the monitoring signals to the controller 80. When the liquid level in the insulated water tank 44 exceeds a preset threshold, the controller 80 controls the opening of the electrically controlled drain valve 45 to automatically discharge the excess liquid, while simultaneously replenishing water through the second pipe 43. When the temperature exceeds the set range, the controller 80 similarly controls the opening of the electrically controlled drain valve 45 to discharge the high-temperature liquid, while simultaneously replenishing water through the second pipe 43, in order to maintain the dynamic balance of liquid level and temperature in the insulated water tank 44, thereby ensuring the stable operation and efficient control of the medium water system.

[0036] During the operation of the cooling and heat recovery system, low-temperature purified water provided by the external medium water system enters the circulating water pump 52 via the fourth pipe 51 and is pressurized within the circulating water pump 52. The system monitors the temperature, flow rate, and pressure of the pressurized medium water in real time during this process and transmits the monitoring data to the controller 80 to achieve intelligent control of fluid transport parameters. The pressurized medium water is distributed and its flow rate is regulated via the first electrically controlled three-way flow regulating valve 53, and then enters two heat exchange paths: the first path enters the first oil cooler 55 via the fifth pipe 54 to recover the waste heat from the cooling oil flowing from the oil tank 70 through the first oil pipe 72 into the heat pump compressor 23; the second path enters the second oil cooler 58 via the seventh pipe 57 to recover the waste heat from the heat pump condenser-evaporator 27 flowing through the third oil pipe 74 into the return oil of the heat pump motor 24. To ensure accurate flow control, flow meters are installed on both the fifth pipe 54 and the seventh pipe 57. The controller 80 dynamically adjusts the distribution ratio of the first electrically controlled three-way flow regulating valve 53 according to actual needs to match the flow requirements under different heat exchange conditions and ensure heat exchange efficiency. The medium water after heat exchange with the first oil cooler 55 and the second oil cooler 58 is discharged from the sixth pipe 56 and the eighth pipe 59, respectively. Temperature sensors are installed at the sixth pipe 56 and the eighth pipe 59 to monitor the water temperature after heat exchange in real time, optimize the system's heat exchange efficiency, and control the temperature of the heat exchange fluid. The discharged medium water flows through the ninth pipe 60 to the second electrically controlled three-way flow regulating valve 61. After passing through the second electrically controlled three-way flow regulating valve 61, it is divided into two parts: one part flows directly back to the insulated water tank 44 to maintain the stability of the medium water circulation; the other part enters the first heat exchanger 13 for secondary heating, further raising the water temperature to near the return water temperature of the waste hot water. After measuring the temperature of the heated return water, the system replenishes it to the heat pump condenser-evaporator 27. The controller 80 efficiently recovers waste heat, minimizing heat loss and improving energy reuse and steam production, achieving efficient energy recovery and utilization. Simultaneously, the high-temperature steam generated inside the heat pump condenser-evaporator 27 flows through the steam pipe 65 and is discharged via the electrically controlled flow regulating valve 66. The steam pipe 65 is equipped with flow, temperature, and pressure sensors to monitor and control the exhaust parameters in real time, optimizing system performance and improving overall energy efficiency. The heat pump condenser-evaporator 27 contains a condenser-evaporator level gauge 67 to monitor the level of the high-temperature water within it and transmits the monitoring signal to the controller 80, ensuring that the water level in the heat pump condenser-evaporator 27 remains within the set range.

[0037] During the operation of the internal cooling oil system, the heat pump compressor 23 requires oil injection for lubrication and cooling. A portion of the oil remains inside the heat pump compressor 23, while the remainder is carried into the heat pump condenser-evaporator 27. Therefore, the cooling oil system can be divided into two parts to ensure the stable operation of the heat pump compressor 23 and the heat pump motor 24, while simultaneously achieving efficient waste heat recovery. The first part is the oil return cooling process of the heat pump condenser-evaporator 27. The cooling oil in the heat pump condenser-evaporator 27 first flows into the heat pump motor 24 via the third oil pipe 74. During this process, the oil temperature and pressure are measured to ensure the controllability of operating parameters. Subsequently, the cooling oil enters the first oil cooler 55 for cooling, and the temperature and pressure are measured again to evaluate the heat exchange effect. The cooled oil flows into the heat pump motor 24 to cool it, and finally enters the oil tank 70 via the fifth oil pipe 76, completing the cooling cycle. The second part is the oil supply cooling process of the oil tank 70. The cooling oil in the oil tank 70 is pressurized by the oil pump 71 and then transported to the heat pump compressor 23. Before entering the heat pump compressor 23, it undergoes secondary cooling in the first oil cooler 55 to further reduce the oil temperature and improve cooling efficiency. The cooled oil then flows back to the oil tank 70 through the fifth oil pipe 76, forming a stable cooling cycle. Through the coordinated operation of the above two parts, the system effectively ensures the stable operation of the heat pump compressor 23 and the heat pump motor 24. At the same time, it utilizes the heat exchange process of the first oil cooler 55 and the second oil cooler 58 to achieve efficient recovery of waste heat. Traditional oil cooling systems typically rely on external primary cooling, resulting in significant heat loss and requiring additional heat dissipation. This system, by optimizing the heat recovery path of the cooling oil, recovers as much heat as possible from the external cooling process to the heat pump system for water preheating, thereby significantly improving energy utilization efficiency, reducing energy consumption, increasing steam production, and enhancing the overall economy and sustainability of the system.

[0038] Based on temperature, pressure, and flow data measured by various sensors, the controller 80 determines the operating status of each fluid and then precisely controls the fluid flow rate and direction by adjusting valves to ensure the system operates under optimal conditions. In addition to regulating the subsystems, the controller 80 is also responsible for maintaining the balance of the entire system. When the controller 80 detects that the liquid level in the insulated water tank 44 exceeds a preset threshold, it controls the opening of the electrically controlled drain valve 45 to automatically discharge the excess liquid, while simultaneously replenishing water through the second pipe 43. Similarly, when the temperature exceeds the set range, the controller 80 also controls the opening of the electrically controlled drain valve 45 to discharge the high-temperature liquid, while simultaneously replenishing water through the second pipe 43, to maintain the dynamic balance between the liquid level and temperature in the insulated water tank 44, thereby ensuring the stable operation and efficient regulation of the cooling water system. When the controller 80 detects that the oil temperature entering the heat pump motor 24 from the heat pump condenser-evaporator 27 via the second oil cooler 58 is too high, the system automatically adjusts the first electrically controlled three-way flow regulating valve 53 in the cooling and heat recovery system to allocate more cooling water flow to the second oil cooler 58, increasing heat exchange and effectively reducing the oil temperature, preventing the heat pump motor 24 from overheating, and protecting the safe and stable operation of the heat pump motor 24. When the controller 80 detects that the oil temperature entering the heat pump compressor 23 from the oil tank 70 via the first oil pipe 72 is too high, the system automatically adjusts the first electrically controlled three-way flow regulating valve 53 in the cooling and heat recovery system to allocate more cooling water flow to the first oil cooler 55, increasing heat exchange and effectively reducing the oil temperature, preventing the heat pump compressor 23 from overheating, and protecting the safe and stable operation of the heat pump compressor 23. In addition, the heat pump condenser-evaporator 27 in the high-temperature steam heat pump system is also equipped with a condenser-evaporator level gauge 67 to monitor the water level in real time. When the liquid level is detected to be lower than the set value, the controller 80 will automatically control the second electrically controlled three-way flow regulating valve 61 in the cooling and heat recovery system to allocate more flow through the twelfth pipe 64 into the heat pump condenser evaporator 27 to supplement the water volume; when the liquid level is higher than the set value, the controller 80 will adjust the opening of the second electrically controlled three-way flow regulating valve 61 to appropriately reduce the water flow to ensure that the liquid level is kept within the ideal range.

[0039] This invention also proposes a method for controlling the external intelligent cooling and heat recovery of a high-temperature steam heat pump, applied to the aforementioned high-temperature steam heat pump external intelligent cooling and heat recovery system. The control method includes: Control the working fluid of the high-temperature steam heat pump system to flow into the heat pump evaporator 21 and the waste heat fluid of the waste heat system for heat exchange. The working fluid after heat exchange flows into the heat pump compressor 23 for compression. Control the flow of the compressed working fluid into the heat pump condenser-evaporator 27; The medium water of the control cooling and heat recovery system flows into the first heat exchanger 13 to exchange heat with the waste heat fluid of the waste heat system. The heat exchanged medium water flows into the heat pump condenser evaporator 27 and exchanges heat with the compressed working fluid to generate steam.

[0040] In the technical solution of this invention, after the waste heat fluid of the waste heat system exchanges heat with the working fluid of the heat pump evaporator 21 and the high-temperature steam heat pump system, it will also exchange heat with the medium water of the first heat exchanger 13 and the cooling and heat recovery system, thereby improving the utilization rate of the waste heat fluid's heat. Furthermore, the medium water of the cooling and heat recovery system absorbs heat from the cooling oil of the internal cooling oil system before heat exchange, and its temperature is relatively higher when it flows into the heat pump condenser-evaporator 27 after heat exchange, making it easier to generate steam.

[0041] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A high-temperature steam heat pump external intelligent cooling and heat recovery system, characterized in that, It includes a waste heat system, a high-temperature steam heat pump system, a cooling and heat recovery system, an internal cooling oil system, and a controller; The waste heat system includes a waste heat inlet pipe, a heat pump evaporator, a first waste heat outlet pipe, a first heat exchanger, and a second waste heat outlet pipe connected in sequence. The high-temperature steam heat pump system includes a heat pump evaporator, a first heat pump connecting pipe, a heat pump compressor, a second heat pump connecting pipe, a heat pump condenser-evaporator, and a third heat pump connecting pipe connected in sequence. The third heat pump connecting pipe is connected to the heat pump evaporator. The working fluid of the high-temperature steam heat pump system exchanges heat with the waste heat fluid of the waste heat system through the heat pump evaporator. The internal cooling oil system is used to provide cooling oil for the high-temperature steam heat pump system; The cooling and heat recovery system is used to cool the cooling oil of the internal cooling oil system. The medium water of the cooling and heat recovery system is transferred to the heat pump condenser-evaporator after exchanging heat with the waste heat fluid of the waste heat system through the first heat exchanger. The waste heat system, the high-temperature steam heat pump system, the cooling and heat recovery system, and the internal cooling oil system are all communicatively connected to the controller.

2. The high-temperature steam heat pump external intelligent cooling and heat recovery system as described in claim 1, characterized in that, The high-temperature steam heat pump system further includes a fourth heat pump connecting pipe, a heat pump flash evaporator, a fifth heat pump connecting pipe, and a sixth heat pump connecting pipe. The fourth heat pump connecting pipe connects the heat pump condenser-evaporator and the heat pump flash evaporator. The fifth heat pump connecting pipe connects the heat pump flash evaporator and the heat pump compressor. The sixth heat pump connecting pipe connects the heat pump flash evaporator and the heat pump evaporator.

3. The high-temperature steam heat pump external intelligent cooling and heat recovery system as described in claim 2, characterized in that, A one-way valve is installed on the second heat pump connecting pipe; The third heat pump connecting pipe is equipped with a first heat pump expansion valve; The fourth heat pump connecting pipe is equipped with a second heat pump expansion valve; The sixth heat pump connecting pipe is equipped with a third heat pump expansion valve.

4. The high-temperature steam heat pump external intelligent cooling and heat recovery system as described in claim 1, characterized in that, The high-temperature steam heat pump system also includes a heat pump wastewater pipe and a heat pump wastewater valve. The heat pump wastewater pipe is connected to the heat pump condenser-evaporator, and the heat pump wastewater valve is located on the heat pump wastewater pipe.

5. The high-temperature steam heat pump external intelligent cooling and heat recovery system as described in claim 1, characterized in that, The high-temperature steam heat pump external intelligent cooling and heat recovery system also includes an external medium water system, which includes a first pipe, a purifier, a second pipe, an insulated water tank, and a third pipe connected in sequence. The insulated water tank is used to provide medium water for the cooling and heat recovery system.

6. The high-temperature steam heat pump external intelligent cooling and heat recovery system as described in claim 5, characterized in that, The insulated water tank is equipped with a water tank level gauge, and the third pipe is equipped with an electrically controlled drain valve. Both the water tank level gauge and the electrically controlled drain valve are communicatively connected to the controller.

7. The high-temperature steam heat pump external intelligent cooling and heat recovery system as described in claim 1, characterized in that, The cooling and heat recovery system includes the first heat exchanger, the heat pump condenser-evaporator, the insulated water tank, the fourth pipe, the first electrically controlled three-way flow regulating valve, the fifth pipe, the first oil cooler, the sixth pipe, the seventh pipe, the second oil cooler, the eighth pipe, the ninth pipe, the second electrically controlled three-way flow regulating valve, the tenth pipe, the eleventh pipe, the twelfth pipe, and the steam pipe. The fourth pipe connects the insulated water tank and the first electrically controlled three-way flow regulating valve; the fifth pipe connects the first electrically controlled three-way flow regulating valve and the first oil cooler; the sixth pipe connects the first oil cooler and the ninth pipe; the seventh pipe connects the first electrically controlled three-way flow regulating valve and the second oil cooler; the eighth pipe connects the second oil cooler and the ninth pipe; the ninth pipe connects to the second electrically controlled three-way flow regulating valve; the tenth pipe connects the second electrically controlled three-way flow regulating valve and the insulated water tank; the eleventh pipe connects the second electrically controlled three-way flow regulating valve and the first heat exchanger; the twelfth pipe connects the first heat exchanger and the heat pump condenser-evaporator; and the steam pipe is located in the heat pump condenser-evaporator. Both the first electrically controlled three-way flow regulating valve and the second electrically controlled three-way flow regulating valve are communicatively connected to the controller.

8. The high-temperature steam heat pump external intelligent cooling and heat recovery system as described in claim 7, characterized in that, A circulating water pump is installed on the fourth pipeline, a condenser level gauge is installed inside the heat pump condenser-evaporator, and an electrically controlled flow regulating valve is installed on the steam pipeline. Both the condenser-evaporator level gauge and the electrically controlled flow regulating valve are communicatively connected to the controller.

9. The high-temperature steam heat pump external intelligent cooling and heat recovery system as described in claim 1, characterized in that, The internal cooling oil system includes the heat pump compressor, heat pump motor, heat pump condenser-evaporator, oil tank, first oil cooler, second oil cooler, oil pump, first oil pipe, second oil pipe, third oil pipe, fourth oil pipe and fifth oil pipe; The first oil pipe connects the oil tank and the first oil cooler. The oil pump is located on the first oil pipe. The second oil pipe connects the first oil cooler and the heat pump compressor. The heat pump compressor is connected to the heat pump motor. The third oil pipe connects the heat pump condenser-evaporator and the second oil cooler. The fourth oil pipe connects the second oil cooler and the heat pump motor. The fifth oil pipe connects the heat pump motor and the oil tank.

10. A method for controlling external intelligent cooling and heat recovery of a high-temperature steam heat pump, applied to the high-temperature steam heat pump external intelligent cooling and heat recovery system as described in any one of claims 1 to 9, characterized in that, The control method includes: The working fluid of the high-temperature steam heat pump system is controlled to flow into the heat pump evaporator and the waste heat system for heat exchange. The working fluid after heat exchange flows into the heat pump compressor for compression. Control the flow of the compressed working fluid into the heat pump condenser-evaporator; The medium water of the cooling and heat recovery system is controlled to flow into the first heat exchanger to exchange heat with the waste heat fluid of the waste heat system; The heat-exchanged medium water flows into the heat pump condenser-evaporator and exchanges heat with the compressed working fluid to generate steam.

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