Dead steam source high-temperature steam heat pump testing system based on heat energy cyclic utilization

Abstract

The invention provides a waste steam source high-temperature steam heat pump testing system based on heat energy cyclic utilization, and belongs to the field of compression heat pumps. The invention aims to solve the problems of unstable heat supply in a high-temperature lift, low energy efficiency of an evaporation end, poor temperature control effect of a low-level heat source side and limited thermal control means of an experimental platform. The system comprises a condenser, an expansion valve, a liquid storage tank, an evaporator, a compressor, a water spraying cooling tank, a steam pressure reducing valve, a circulating pump and a regulating valve, or a water mixing cooling tank and a heat supply liquid storage tank are additionally arranged, so that the dynamic balance and control of the temperature of the hot end of the system are realized; or a steam pressure reducing valve is replaced by a steam-water heat exchanger, so that heat exchange is carried out on condensed steam and working medium water to realize mild cooling, and redundant energy consumption is avoided; or a bypass adjustable shunting loop is arranged, so that partial high-temperature backwater bypass mixing is realized, and the thermal matching property and the operation stability of the system are enhanced. According to the invention, the output temperature of over 100 DEG C is realized, and the universality and debugging flexibility of experimental system design are realized.

Description

Technical Field

[0001] The present invention relates to the technical field of compression heat pumps, and in particular to a high-temperature steam heat pump test system with an exhaust steam source based on heat energy recycling. Background Art

[0002] Heat pump technology is increasingly being used in industrial heating due to its high efficiency, energy saving, and environmentally friendly, low-carbon nature. However, traditional heat pump systems rely on medium- to low-temperature water or air as heat sources, limiting their output temperature and making it difficult to meet the high-temperature steam (>100°C) requirements of industrial processes. This is particularly evident when it comes to replacing high-energy heating methods such as gas boilers and electric heating.

[0003] In recent years, water-based high-temperature heat pump technology has attracted attention due to its good thermal properties and environmental friendliness. Conventional single-stage compression has the disadvantages of high exhaust temperature and large compression ratio. Multi-stage compression can achieve high-temperature output, but it still faces the following technical challenges: (1) The evaporation end generally uses high-energy electricity heating for heating, which has low energy efficiency; (2) The high-quality heat of the condenser is difficult to be effectively recycled and utilized, and the overall thermal energy utilization rate of the system is not high; (3) The thermal control means of the experimental platform are limited, and it lacks the ability to adapt to multiple working conditions and the energy efficiency evaluation mechanism.

[0004] Especially in industries like metallurgy and chemical engineering, large amounts of exhaust steam resources are difficult to utilize directly and are often discharged as condensation, resulting in energy waste. Directly developing high-temperature heat pumps under real-world factory data presents complex operating conditions, high risks, and difficulty in repeated comparisons. If a high-temperature heat pump testing system specifically designed for exhaust steam heat recovery could be constructed, with the ability to reduce the pressure and cool the condensing side steam for regeneration and reuse, and the ability to flexibly respond to heat source temperature fluctuations under different operating conditions, it would greatly expand the application boundaries of heat pump technology in industrial energy conservation. Summary of the Invention

[0005] The technical problems to be solved by the present invention are:

[0006] In order to solve the problems of unstable heating supply in large temperature head, low energy efficiency at the evaporation end, poor temperature control effect on the low-level heat source side, and limited thermal control means of the experimental platform.

[0007] The present invention is to solve the above technical problems using the following technical solutions:

[0008] The present invention provides a high-temperature steam heat pump test system for an exhaust steam source based on heat energy recycling, comprising a condenser, a first expansion valve, a second expansion valve, a liquid storage tank, an evaporator, a first compressor, a second compressor, a water spray cooling tank, a steam pressure reducing valve, a cooling radiator, a first circulating pump, a first regulating valve, a second regulating valve, a third regulating valve, a fourth regulating valve and a baffle.

[0009] The refrigerant outlet end of the evaporator is connected to the inlet of the first compressor, the outlet of the first compressor is connected to the left air inlet of the water spray cooling tank, the top outlet end of the water spray cooling tank is connected to the inlet of the second compressor, the outlet of the second compressor is connected to the refrigerant inlet end of the condenser, the refrigerant outlet end of the condenser is respectively connected to the upper right water inlet of the water spray cooling tank and the liquid inlet of the second expansion valve, a first regulating valve is provided on the pipeline connecting the refrigerant outlet end of the condenser and the upper right water inlet of the water spray cooling tank, the outlet of the second expansion valve is connected to the top liquid inlet of the liquid storage tank and immersed below the liquid level in the liquid storage tank, the left steam outlet of the liquid storage tank is connected to the right steam inlet of the water spray cooling tank, the baffle is arranged between the water inlet and the steam inlet of the water spray cooling tank, the bottom water outlet of the water spray cooling tank is connected to the lower left water inlet of the liquid storage tank, the bottom liquid outlet of the liquid storage tank is connected to the liquid inlet of the first expansion valve, and the outlet of the first expansion valve is connected to the refrigerant inlet end of the evaporator.

[0010] The steam supply outlet of the condenser is connected to the steam inlet of the steam reducing valve, and the steam outlet of the steam reducing valve is connected to the low-level hot water inlet of the evaporator and the low-level hot water inlet of the cooling radiator respectively. A third regulating valve is provided on the pipeline connecting the steam outlet of the steam reducing valve and the low-level hot water inlet of the evaporator, and a fourth regulating valve is provided on the pipeline connecting the steam outlet of the steam reducing valve and the low-level hot water inlet of the cooling radiator. The low-level hot water outlet of the cooling radiator is connected to the inlet of the first circulating pump after merging with the low-level hot water outlet of the evaporator, and the outlet of the first circulating pump is connected to the liquid supply inlet of the condenser. A second regulating valve is provided on the pipeline connecting the outlet of the first circulating pump and the liquid supply inlet of the condenser.

[0011] The cooling radiator is provided with a cooling water inlet end and a cooling water outlet end.

[0012] Furthermore, it also includes a water mixing and cooling tank and a stop valve.

[0013] The steam outlet of the steam pressure reducing valve is connected to the top inlet of the mixing water cooling tank, the natural cooling water is connected to the left water inlet of the mixing water cooling tank, a stop valve is provided on the pipeline for inputting natural cooling water, the right liquid outlet of the mixing water cooling tank is respectively connected to the low-level hot water inlet of the evaporator and the low-level hot water inlet of the cooling radiator, a third regulating valve is provided on the pipeline connecting the right liquid outlet of the mixing water cooling tank and the low-level hot water inlet of the evaporator, a fourth regulating valve is provided on the pipeline connecting the right liquid outlet of the mixing water cooling tank and the low-level hot water inlet of the cooling radiator, and waste water is discharged from the high-temperature side pipeline of the cooling radiator.

[0014] Furthermore, it also includes a heating liquid storage tank,

[0015] The low-level hot water outlet of the cooling radiator merges with the low-level hot water outlet of the evaporator and is connected to the left liquid inlet of the heating liquid storage tank. The right liquid outlet of the heating liquid storage tank is connected to the inlet of the second regulating valve.

[0016] A high-temperature steam heat pump test system with an exhaust steam source based on heat energy recycling includes a condenser, a first expansion valve, a second expansion valve, a liquid storage tank, an evaporator, a first compressor, a second compressor, a water spray cooling tank, a cooling radiator, a steam-water heat exchanger, a second circulating pump, a first regulating valve and a baffle.

[0017] The refrigerant outlet end of the evaporator is connected to the inlet of the first compressor, the outlet of the first compressor is connected to the left air inlet of the water spray cooling tank, the top outlet end of the water spray cooling tank is connected to the inlet of the second compressor, the outlet of the second compressor is connected to the refrigerant inlet end of the condenser, the refrigerant outlet end of the condenser is respectively connected to the upper right water inlet of the water spray cooling tank and the liquid inlet of the second expansion valve, a first regulating valve is provided on the pipeline connecting the refrigerant outlet end of the condenser and the upper right water inlet of the water spray cooling tank, the outlet end of the second expansion valve is connected to the top liquid inlet of the liquid storage tank and immersed below the liquid level in the liquid storage tank, the left steam outlet of the liquid storage tank is connected to the right steam inlet of the water spray cooling tank, the baffle is arranged between the water inlet and the steam inlet of the water spray cooling tank, the bottom water outlet of the water spray cooling tank is connected to the lower left water inlet of the liquid storage tank, the bottom liquid outlet of the liquid storage tank is connected to the liquid inlet of the first expansion valve, and the outlet of the first expansion valve is connected to the refrigerant inlet end of the evaporator.

[0018] The steam supply outlet of the condenser is connected to the upper left steam inlet of the steam-water heat exchanger, and the bottom condensate outlet of the steam-water heat exchanger is connected to the condensate inlet of the condenser.

[0019] The hot water outlet end on the right side of the steam-water heat exchanger is connected to the hot water inlet end of the cooling radiator, and the hot water outlet end of the cooling radiator is connected to the low-level hot water inlet end of the evaporator. A second circulation pump is provided on the pipeline connecting the hot water outlet end of the cooling radiator and the low-level hot water inlet end of the evaporator, and the low-level hot water outlet end of the evaporator is connected to the hot water inlet end on the right side of the steam-water heat exchanger.

[0020] Furthermore, a bypass valve is included.

[0021] The low-level hot water outlet end of the evaporator is connected to the hot water inlet end on the right side of the steam-water heat exchanger and the inlet end of the bypass valve respectively. The outlet end of the bypass valve is merged with the hot water outlet end on the right side of the steam-water heat exchanger and then connected to the hot water inlet end of the cooling radiator.

[0022] Furthermore, the cooling radiator is provided with a cooling water inlet and a cooling water outlet.

[0023] Furthermore, it also includes fan coil units,

[0024] The inlet end of the fan coil is connected to the cooling side of the cooling radiator.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) The present invention utilizes two-stage compression technology in conjunction with an intermediate liquid spray cooling structure, so that the water working medium can stably output high-temperature steam exceeding 100°C after absorbing the low-enthalpy steam from the exhaust steam heat source through efficient compression. Compared with conventional heat pump systems that use hot water or air as heat sources, the present invention provides a test system using steam as a heat source. The steam on the condensing side is mainly decompressed and cooled before being reused on the evaporating side. The exhaust steam source provides heat energy to the steam heat pump system and then provides low-temperature steam to the evaporating side after decompression. This is more suitable for industrial waste steam recovery scenarios, realizing steam-steam high-temperature heat recycling, effectively reducing the problems of excessive exhaust temperature and compression ratio in the single-stage compression process, reducing compression power consumption, and having the versatility of experimental system design and debugging flexibility.

[0027] (2) The present invention constructs a heat energy circulation path for exhaust steam recovery within the test system, realizing a volumetric reuse mechanism for high-temperature exhaust steam. Specifically, after the high-temperature steam generated by the condenser is decompressed and cooled, part of the high-temperature heat is recovered and used as low-temperature steam to assist the evaporation section in absorbing heat, thereby realizing self-supplied heat within the heat pump. By converting the residual enthalpy in the industrial by-product exhaust steam into an effective heat source within the heat pump cycle, not only is the overall energy consumption of the experimental system significantly reduced and the heat utilization efficiency improved, but it also has good energy adaptability and energy-saving and emission-reduction effects, providing an efficient, adjustable, and low-carbon technical path for exhaust steam heat recovery.

[0028] (3) Based on the requirements of experimental working conditions, the present invention designs a hot end treatment method that combines "dynamic decompression cooling" with "slow-release heat exchange cooling". On the one hand, by setting up a steam pressure reducing valve, direct decompression and rapid cooling of high-temperature steam can be achieved, which is suitable for rapid response adjustment in temperature mutation scenarios or experimental stages; on the other hand, by adding a mixed water cooling tank and a heating liquid storage tank, unnecessary energy consumption can be avoided without adding additional power equipment, while achieving dynamic balance and control of the system's hot end temperature, which is suitable for high-temperature heat pump experimental scenarios with high requirements for thermal stability and energy efficiency. By designing this test system, various exhaust steam working conditions can be simulated in a controllable and adjustable environment, and the decompression condensation and heat energy recycling schemes can be verified, reducing R&D risks and costs, and providing reliable data and optimization basis for actual industrial applications.

[0029] (4) The present invention achieves gentle cooling by installing a steam-water heat exchanger at the condenser outlet, allowing the condensed steam to exchange heat with the working medium water. This makes it suitable for stable heat recovery and continuous heating scenarios. Compared with the traditional heat pump system, which is prone to temperature control fluctuations at high head, the present invention effectively improves the accuracy of evaporation side temperature control and the stability of system operation.

[0030] (5) Water cooling or air cooling is used to achieve different heat dissipation and temperature control. In addition, by setting a bypass valve to construct an adjustable diversion circuit, a portion of the high-temperature return water can be bypassed and mixed, thereby reducing the return water temperature entering the evaporator, improving the heat transfer driving force of the heat exchanger, and enhancing the system's thermal matching and operational stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The structure of a high-temperature steam heat pump test system based on heat energy recycling of exhaust steam source in the embodiment of the present invention Figure 1 ;

[0032] Figure 2 The structure of a high-temperature steam heat pump test system based on heat energy recycling of exhaust steam source in the embodiment of the present invention Figure 2 ;

[0033] Figure 3 The structure of a high-temperature steam heat pump test system based on heat energy recycling of exhaust steam source in the embodiment of the present invention Figure 3 ;

[0034] Figure 4 The structure of a high-temperature steam heat pump test system based on heat energy recycling of exhaust steam source in the embodiment of the present invention Figure 4 ;

[0035] Figure 5 The structure of a high-temperature steam heat pump test system based on heat energy recycling of exhaust steam source in the embodiment of the present invention Figure 5 ;

[0036] Figure 6 The structure of a high-temperature steam heat pump test system based on heat energy recycling of exhaust steam source in the embodiment of the present invention Figure 6 .

[0037] Description of reference numerals:

[0038] 1. Condenser; 2. First expansion valve; 3. Second expansion valve; 4. Liquid storage tank; 5. Evaporator; 6. First compressor; 7. Second compressor; 8. Water spray cooling tank; 9. Steam pressure reducing valve; 10. Cooling radiator; 11. Mixing water cooling tank; 12. Heating liquid storage tank; 13. Steam-water heat exchanger; 14. Fan coil unit; 21. First circulation pump; 22. Second circulation pump; 23. First regulating valve; 24. Second regulating valve; 25. Third regulating valve; 26. Fourth regulating valve; 27. Stop valve; 28. Bypass valve; 29. ​​Baffle; 31. First water working medium gas pipeline; 32. Second water working medium gas pipeline; 33. Third water working medium gas pipeline; 34. Fourth water working medium gas pipeline; 41. First water working medium liquid pipeline; 42. Second water working medium liquid pipeline; 43. Third water working medium liquid pipeline Pipeline; 44. Fourth water working medium liquid pipeline; 45. Fifth water working medium liquid pipeline; 46. Water spray pipeline; 47. Water vapor pipeline; 48. Return water pipeline; 51. First heating pipeline; 52. Second heating pipeline; 53. Third heating pipeline; 54. Fourth heating pipeline; 55. Fifth heating pipeline; 56. Sixth heating pipeline; 57. Seventh heating pipeline; 58. Eighth heating pipeline; 59. Ninth heating pipeline; 60. Tenth heating pipeline; 61. First low-level hot water pipeline; 62. Second low-level hot water pipeline; 63. Third low-level hot water pipeline; 64. Fourth low-level hot water pipeline; 65. Drain pipeline; 66. Bypass pipeline; 67. High-temperature steam pipeline; 68. High-temperature condensate pipeline; 71. First cooling water pipeline; 72. Second cooling water pipeline; 73. Third cooling water pipeline. DETAILED DESCRIPTION

[0039] In the description of the present invention, it should be noted that the terminology in each embodiment, such as "up", "down", "front", "back", "left", "right", etc., which indicate directions, are only for simplifying the description of the positional relationship based on the drawings in the specification, and do not mean that the referred elements and devices must be operated in accordance with the specific directions and defined operations and methods and structures in the specification. Such directional nouns do not constitute a limitation to the present invention.

[0040] In the description of the present invention, it should be noted that the terms "first," "second," and "third" mentioned in the embodiments of the present invention are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, a feature specified as "first," "second," or "third" may explicitly or implicitly include one or more of such features.

[0041] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0042] Specific implementation plan 1: Combined Figure 1 As shown, the present invention provides a high-temperature steam heat pump test system for an exhaust steam source based on heat energy recycling, comprising a condenser 1, a first expansion valve 2, a second expansion valve 3, a liquid storage tank 4, an evaporator 5, a first compressor 6, a second compressor 7, a water spray cooling tank 8, a steam pressure reducing valve 9, a cooling radiator 10, a first circulating pump 21, a first regulating valve 23, a second regulating valve 24, a third regulating valve 25, a fourth regulating valve 26, a baffle 29, a first water working medium gas pipeline 31, a second water working medium gas pipeline 32, a third water working medium gas pipeline 33, a fourth a water working medium gas pipeline 34, a first water working medium liquid pipeline 41, a second water working medium liquid pipeline 42, a third water working medium liquid pipeline 43, a fourth water working medium liquid pipeline 44, a fifth water working medium liquid pipeline 45, a water spray pipeline 46, a water vapor pipeline 47, a water return pipeline 48, a first heating supply pipeline 51, a second heating supply pipeline 52, a fifth heating supply pipeline 55, a first low-level hot water pipeline 61, a second low-level hot water pipeline 62, a third low-level hot water pipeline 63, a fourth low-level hot water pipeline 64, a first cooling water pipeline 71, and a second cooling water pipeline 72.

[0043] The inlet end of the first water working medium gas pipeline 31 is connected to the refrigerant outlet end of the evaporator 5, the outlet end of the first water working medium gas pipeline 31 is connected to the inlet of the first compressor 6, the outlet of the first compressor 6 is connected to the inlet end of the second water working medium gas pipeline 32, the outlet end of the second water working medium gas pipeline 32 is connected to the left air inlet of the water spray cooling tank 8, the top outlet end of the water spray cooling tank 8 is connected to the inlet end of the third water working medium gas pipeline 33, the outlet end of the third water working medium gas pipeline 33 is connected to the inlet end of the second compressor 7 The outlet of the second compressor 7 is connected to the inlet end of the fourth water working medium gas pipeline 34, the outlet end of the fourth water working medium gas pipeline 34 is connected to the refrigerant inlet end of the condenser 1, the refrigerant outlet end of the condenser 1 is connected to the inlet end of the first water working medium liquid pipeline 41, the outlet end of the first water working medium liquid pipeline 41 is respectively connected to the inlet end of the water spray pipeline 46 and the inlet end of the second water working medium liquid pipeline 42, the water spray pipeline 46 is provided with a first regulating valve 23, and the outlet end of the water spray pipeline 46 is connected to the outlet end of the water spray cooling tank 8. The upper right water inlet is connected, the outlet end of the second water working medium liquid pipeline 42 is connected to the liquid inlet of the second expansion valve 3, the liquid outlet of the second expansion valve 3 is connected to the inlet end of the third water working medium liquid pipeline 43, the outlet end of the third water working medium liquid pipeline 43 is connected to the top liquid inlet of the liquid storage tank 4 and immersed below the liquid level in the liquid storage tank 4, the left steam outlet of the liquid storage tank 4 is connected to the inlet end of the water vapor pipeline 47, the outlet end of the water vapor pipeline 47 is connected to the right steam inlet of the water spray cooling tank 8, and the baffle 29 is set at the water spray cooling tank 8. Between the water inlet and the steam inlet in the tank 8, mixing is achieved first and then cooling. The bottom water outlet of the water spray cooling tank 8 is connected to the water inlet on the lower left side of the liquid storage tank 4 through the return water pipe 48. The bottom liquid outlet of the liquid storage tank 4 is connected to the inlet end of the fourth water working medium liquid pipeline 44. The outlet end of the fourth water working medium liquid pipeline 44 is connected to the liquid inlet of the first expansion valve 2. The liquid outlet of the first expansion valve 2 is connected to the inlet end of the fifth water working medium liquid pipeline 45. The outlet end of the fifth water working medium liquid pipeline 45 is connected to the refrigerant inlet end of the evaporator 5.

[0044] The inlet end of the first heating supply pipeline 51 is connected to the steam supply outlet end of the condenser 1, the outlet end of the first heating supply pipeline 51 is connected to the steam inlet of the steam pressure reducing valve 9, the steam outlet of the steam pressure reducing valve 9 is connected to the inlet end of the second heating supply pipeline 52, the outlet end of the second heating supply pipeline 52 is respectively connected to the inlet end of the first low-level hot water pipeline 61 and the inlet end of the third low-level hot water pipeline 63, the first low-level hot water pipeline 61 is provided with a third regulating valve 25, the outlet end of the first low-level hot water pipeline 61 is connected to the low-level hot water inlet end of the evaporator 5, and the low-level hot water outlet end of the evaporator 5 is connected to the second low-level hot water pipeline 6 2, a fourth regulating valve 26 is provided on the third low-level hot water pipeline 63, an outlet end of the third low-level hot water pipeline 63 is connected to the low-level hot water inlet end of the cooling radiator 10, and the low-level hot water outlet end of the cooling radiator 10 is connected to the inlet end of the fourth low-level hot water pipeline 64. The outlet end of the second low-level hot water pipeline 62 and the outlet end of the fourth low-level hot water pipeline 64 are merged and connected to the inlet end of the fifth heating pipeline 55. The fifth heating pipeline 55 is sequentially provided with a first circulating pump 21 and a second regulating valve 24. The outlet end of the fifth heating pipeline 55 is connected to the liquid supply inlet end of the condenser 1.

[0045] The outlet end of the first cooling water pipeline 71 is connected to the cooling water inlet end of the cooling radiator 10 , and the cooling water outlet end of the cooling radiator 10 is connected to the inlet end of the second cooling water pipeline 72 .

[0046] The operating principle of this implementation plan:

[0047] After heat exchange with low-level heat source water in the evaporator 5, the refrigerant water is converted into water vapor. It then enters the first compressor 6 for heating and pressure increase before entering the water spray cooling tank 8. There, it is sprayed with some liquid water from the outlet of the condenser 1 to cool it down and mix with the saturated water vapor from the liquid storage tank 4. It then enters the second compressor 7 for compression. After heating and pressure increase, it enters the condenser 1, releasing heat and becoming liquid water. A portion of the refrigerant flows through the water spray cooling tank 8 via the water spray line 46 to cool the superheated vapor. The remaining portion, as liquid refrigerant, flows through the second water working medium liquid line 42 and continues to flow into the second expansion valve 3. After throttling and pressure reduction, it flashes and enters the liquid storage tank 4. It then enters the water spray cooling tank 8 through the water vapor line 47. After throttling through the first expansion valve 2, the liquid water enters the evaporator 5, where it absorbs heat and vaporizes, completing the cycle. Excess water in the water spray cooling tank 8 flows into the liquid storage tank 4 via the return line 48.

[0048] Liquid water on the heating side absorbs heat in condenser 1, vaporizing into high-temperature, high-pressure steam. After passing through steam pressure reducing valve 9, it splits into two paths. One path enters radiator 10, where it exchanges heat with the cooling water on the cooling side, releasing heat and lowering its temperature. The other path enters evaporator 5, serving as the system's low-level heat source, releasing heat and transferring heat. The two hot water paths are then mixed, pressurized by first circulation pump 21, and reenter condenser 1, absorbing heat and vaporizing, completing the thermal energy cycle.

[0049] Generally speaking, two effects are achieved. An internal heat energy circulation path with exhaust steam as the heat source is constructed, and part of the heat energy of the high-temperature steam released by the condenser 1 is recovered for heat absorption at the evaporation end, which significantly reduces the overall energy consumption of the system and realizes the closed-loop utilization of the internal heat energy of the heat pump. At the same time, a two-stage compression water spray cooling form is adopted to achieve a heating target of more than 100°C while ensuring the reduction of the compressor exhaust superheat; compared with the existing system, this system especially sets a steam pressure reducing valve 9 for the external steam cycle. The existing system mostly realizes evaporation side heating in the form of external heat source water, which requires additional energy consumption. The system uses exhaust steam as the heat source, directly reduces the pressure of high-temperature steam, and uses circulating cooling water to dissipate the excess input energy of the system, while ensuring the stable operation of the system, saving energy consumption.

[0050] This invention utilizes water compression technology to improve the quality of low-grade exhaust steam and output high-grade steam. It also integrates external circulation to achieve high-temperature thermal energy recovery and reuse. Heat source parameters on the evaporation side are regulated by a pressure reducing valve, a regulating valve, and a cooling radiator 10. Specifically, evaporation-side temperature control is achieved through pressure reduction and flow regulation. Furthermore, the combination of two-stage compression and water spray cooling employed in this system can be used in high-temperature heat pump experimental testing platforms. Therefore, this system architecture offers the versatility of experimental system design and the flexibility of debugging, making it suitable for industrial applications such as process heating, steam replacement for hot water, or steam utilization.

[0051] Specific implementation plan 2: Combined Figure 2 As shown, it also includes a water mixing and cooling tank 11, a stop valve 27, a third heat supply pipeline 53, a drain pipeline 65, and a third cooling water pipeline 73.

[0052] The outlet end of the second heating pipeline 52 is connected to the top inlet end of the mixing water cooling tank 11, and the natural cooling water is connected to the left water inlet of the mixing water cooling tank 11 through the third cooling water pipeline 73. The third cooling water pipeline 73 is provided with a stop valve 27. The right liquid outlet of the mixing water cooling tank 11 is connected to the inlet end of the third heating pipeline 53. The outlet end of the third heating pipeline 53 is respectively connected to the inlet end of the first low-level hot water pipeline 61 and the inlet end of the third low-level hot water pipeline 63. The outlet end of the fourth low-level hot water pipeline 64 is also connected to the inlet end of the drain pipeline 65. By setting the drain pipeline 65, the water inlet and water outlet of the system are kept balanced.

[0053] This embodiment differs from the first embodiment in that the high-temperature, high-pressure steam, after being depressurized by steam pressure reducing valve 9, enters mixed water cooling tank 11 for cooling. After exiting mixed water cooling tank 11, it is split into two paths, completing the heat energy cycle. Mixed water cooling further achieves stable temperature control at high temperature heads, improving system stability.

[0054] The other combinations and connection relationships of this embodiment are the same as those of the first embodiment.

[0055] Specific implementation plan three: combined Figure 3 As shown, it also includes a heating liquid storage tank 12 and a fourth heating pipeline 54.

[0056] The outlet end of the second low-level hot water pipeline 62 and the outlet end of the fourth low-level hot water pipeline 64 are merged and connected to the inlet end of the fourth heating pipeline 54. The outlet end of the fourth heating pipeline 54 is connected to the left liquid inlet of the heating liquid storage tank 12, and the right liquid outlet of the heating liquid storage tank 12 is connected to the inlet end of the fifth heating pipeline 55.

[0057] This embodiment differs from the second embodiment in that the hot water, after merging with the second low-level hot water pipe 62 and the fourth low-level hot water pipe 64, enters the heating liquid storage tank 12. It is then pressurized by the first circulating pump 21 and reenters the condenser 1 to absorb heat and vaporize, completing the heat energy cycle. The heating liquid storage tank, serving as a storage unit for the heating cycle working fluid, enables the storage and delayed release of circulating hot water, thereby enhancing thermal stability and regulatory buffering capacity under fluctuating heat loads, effectively improving thermal energy utilization and heating continuity.

[0058] The other combinations and connection relationships of this embodiment are the same as those of the second embodiment.

[0059] Specific implementation plan four: combined Figure 4 As shown, the present invention provides a high-temperature steam heat pump test system for an exhaust steam source based on heat energy recycling, comprising a condenser 1, a first expansion valve 2, a second expansion valve 3, a liquid storage tank 4, an evaporator 5, a first compressor 6, a second compressor 7, a water spray cooling tank 8, a cooling radiator 10, a steam-water heat exchanger 13, a second circulating pump 22, a first regulating valve 23, a baffle 29, a first water working medium gas pipeline 31, a second water working medium gas pipeline 32, a third water working medium gas pipeline 33, a first ... a fourth water working medium gas pipeline 34, a first water working medium liquid pipeline 41, a second water working medium liquid pipeline 42, a third water working medium liquid pipeline 43, a fourth water working medium liquid pipeline 44, a fifth water working medium liquid pipeline 45, a water spray pipeline 46, a water vapor pipeline 47, a water return pipeline 48, a sixth heating pipeline 56, an eighth heating pipeline 58, a ninth heating pipeline 59, a high-temperature steam pipeline 67, a high-temperature condensate pipeline 68, a first cooling water pipeline 71, and a second cooling water pipeline 72.

[0060] The inlet end of the first water working medium gas pipeline 31 is connected to the refrigerant outlet end of the evaporator 5, the outlet end of the first water working medium gas pipeline 31 is connected to the inlet of the first compressor 6, the outlet of the first compressor 6 is connected to the inlet end of the second water working medium gas pipeline 32, the outlet end of the second water working medium gas pipeline 32 is connected to the left air inlet of the water spray cooling tank 8, the top outlet end of the water spray cooling tank 8 is connected to the inlet end of the third water working medium gas pipeline 33, the outlet end of the third water working medium gas pipeline 33 is connected to the left air inlet of the second compressor 7 The inlet end is connected, the outlet end of the second compressor 7 is connected to the inlet end of the fourth water working medium gas pipeline 34, the outlet end of the fourth water working medium gas pipeline 34 is connected to the refrigerant inlet end of the condenser 1, the refrigerant outlet end of the condenser 1 is connected to the inlet end of the first water working medium liquid pipeline 41, the outlet end of the first water working medium liquid pipeline 41 is connected to the inlet end of the water spray pipeline 46 and the inlet end of the second water working medium liquid pipeline 42 respectively, the water spray pipeline 46 is provided with a first regulating valve 23, and the outlet end of the water spray pipeline 46 is connected to the spray The upper right water inlet of the water cooling tank 8 is connected, the outlet end of the second water working medium liquid pipeline 42 is connected to the liquid inlet of the second expansion valve 3, the outlet of the second expansion valve 3 is connected to the inlet end of the third water working medium liquid pipeline 43, the outlet end of the third water working medium liquid pipeline 43 is connected to the top liquid inlet of the liquid storage tank 4 and immersed below the liquid level in the liquid storage tank 4, the left steam outlet of the liquid storage tank 4 is connected to the inlet end of the water vapor pipeline 47, the outlet end of the water vapor pipeline 47 is connected to the right steam inlet of the water spray cooling tank 8, and the baffle 29 is connected. It is arranged between the water inlet and the steam inlet of the water spray cooling tank 8. The bottom water outlet of the water spray cooling tank 8 is connected to the water inlet on the lower left side of the liquid storage tank 4 through the return water pipe 48. The bottom liquid outlet of the liquid storage tank 4 is connected to the inlet end of the fourth water working medium liquid pipe 44. The outlet end of the fourth water working medium liquid pipe 44 is connected to the liquid inlet of the first expansion valve 2. The outlet of the first expansion valve 2 is connected to the inlet end of the fifth water working medium liquid pipe 45. The outlet end of the fifth water working medium liquid pipe 45 is connected to the refrigerant inlet end of the evaporator 5.

[0061] The inlet end of the high-temperature steam pipeline 67 is connected to the steam supply outlet end of the condenser 1, the outlet end of the high-temperature steam pipeline 67 is connected to the upper left steam inlet of the steam-water heat exchanger 13, the bottom condensate outlet end of the steam-water heat exchanger 13 is connected to the inlet end of the high-temperature condensate pipeline 68, and the outlet end of the high-temperature condensate pipeline 68 is connected to the condensate inlet end of the condenser 1.

[0062] The inlet end of the sixth heating pipeline 56 is connected to the hot water outlet end on the right side of the steam-water heat exchanger 13, the outlet end of the sixth heating pipeline 56 is connected to the hot water inlet end of the cooling radiator 10, the hot water outlet end of the cooling radiator 10 is connected to the inlet end of the eighth heating pipeline 58, the eighth heating pipeline 58 is provided with a second circulation pump 22, the outlet end of the eighth heating pipeline 58 is connected to the low-level hot water inlet end of the evaporator 5, the low-level hot water outlet end of the evaporator 5 is connected to the inlet end of the ninth heating pipeline 59, the outlet end of the ninth heating pipeline 59 is connected to the hot water inlet end on the right side of the steam-water heat exchanger 13,

[0063] The outlet end of the first cooling water pipeline 71 is connected to the cooling water inlet end of the cooling radiator 10 , and the cooling water outlet end of the cooling radiator 10 is connected to the inlet end of the second cooling water pipeline 72 .

[0064] The operating principle of this implementation plan:

[0065] After heat exchange with low-level heat source water in the evaporator 5, the refrigerant water is converted into water vapor. It then enters the first compressor 6 for heating and pressure increase before entering the water spray cooling tank 8. There, it is sprayed with some liquid water from the outlet of the condenser 1 to cool it down and mix with the saturated water vapor from the liquid storage tank 4. It then enters the second compressor 7 for compression. After heating and pressure increase, it enters the condenser 1, releasing heat and becoming liquid water. A portion of the refrigerant flows through the water spray cooling tank 8 via the water spray line 46 to cool the superheated vapor. The remaining portion, as liquid refrigerant, flows through the second water working medium liquid line 42 and continues to flow into the second expansion valve 3. After throttling and pressure reduction, it flashes and enters the liquid storage tank 4. It then enters the water spray cooling tank 8 through the water vapor line 47. After throttling through the first expansion valve 2, the liquid water enters the evaporator 5, where it absorbs heat and vaporizes, completing the cycle. Excess water in the water spray cooling tank 8 flows into the liquid storage tank 4 via the return line 48.

[0066] The liquid water on the heating side absorbs heat and vaporizes into high-temperature and high-pressure steam through the condenser 1, and enters the steam-water heat exchanger 13 to release latent heat, heating the low-temperature liquid water from the outlet of the evaporator 5. After heat exchange, the high-temperature side steam is liquefied into condensed water and enters the condenser 1. Driven by the second circulation pump 22, the water on the heating side enters the steam-water heat exchanger 13 to absorb heat and heat up, and then enters the cooling radiator 10 to exchange heat with the cooling water on the cooling side, releasing heat and thus the temperature drops, and then enters the evaporator 5 as the low-level heat source of the system, releasing heat to realize heat transfer.

[0067] In general, two effects are achieved. The high-temperature heating characteristics of the water working medium and the secondary compression water spray cooling form are utilized to effectively reduce the problems of excessive exhaust temperature and compression ratio in the single-stage compression process, and achieve an output temperature exceeding 100°C. By installing a steam-water heat exchanger 13 at the outlet of the condenser 1, the condensed steam and the working medium water are heat exchanged to achieve gentle cooling.

[0068] Conventional high-temperature heat pump systems, operating under high-temperature head conditions, often directly utilize the steam at the outlet of condenser 1. This lacks a secondary, gentle heat exchange process between the condensed steam and the working water, leading to drastic temperature changes at the hot end and prone to temperature control fluctuations. This results in insufficient heating stability and temperature control accuracy on the evaporation side. The system of the present invention incorporates a steam-water heat exchanger 13 at the outlet of condenser 1, allowing the condensed steam to first undergo heat exchange with the working water, achieving gentle cooling and heat redistribution, avoiding sudden cooling or heating at the hot end. This significantly improves the temperature control accuracy of the evaporation side and the stability of the overall system operation, making it particularly suitable for continuous heating and stable heat recovery scenarios.

[0069] The present invention utilizes water working fluid compression technology to achieve energy quality improvement and heat energy recycling. Compared with the existing method of using external electric heating or high-energy consumption heat source to supply heat to the evaporation end, it greatly reduces the overall energy consumption of the experimental system, improves the heat utilization efficiency, and has good energy-saving and environmental protection characteristics.

[0070] Specific implementation plan five: combined Figure 5 As shown, it also includes a bypass valve 28, a seventh heating pipeline 57, a tenth heating pipeline 60, and a bypass pipeline 66.

[0071] The outlet end of the sixth heating pipeline 56 and the outlet end of the bypass pipeline 66 are merged and connected to the inlet end of the seventh heating pipeline 57. The outlet end of the seventh heating pipeline 57 is connected to the hot water inlet end of the cooling radiator 10. The outlet end of the ninth heating pipeline 59 is respectively connected to the inlet end of the tenth heating pipeline 60 and the inlet end of the bypass pipeline 66. A bypass valve 28 is provided on the bypass pipeline 66.

[0072] The difference between this embodiment and the fourth embodiment is that the low-temperature liquid water from the evaporator 5 is partially bypassed before entering the steam-water heat exchanger 13. After mixing with the high-temperature liquid water that has absorbed heat and heated up in the steam-water heat exchanger 13, it becomes medium-temperature liquid water. It then enters the cooling radiator 10 to exchange heat with the cooling water on the cooling side. After cooling, it enters the evaporator 5 as the low-level heat source of the system, releasing heat to achieve heat transfer. By setting a bypass valve to construct an adjustable diversion loop, the bypass mixing and temperature reduction of some high-temperature return water are achieved, thereby reducing the end difference of the heating side flowing through the evaporator and enhancing the thermal matching and operational stability of the system. In addition, the bypass valve can flexibly adjust the return water mixing ratio according to load changes, achieving effective temperature control and adapting to the needs of multiple operating conditions.

[0073] The other combinations and connection relationships of this embodiment are the same as those of the fourth embodiment.

[0074] Specific implementation plan six: combined Figure 6 As shown, it also includes: a fan coil 14, which is connected to the cooling side of the cooling radiator 10.

[0075] The difference between this implementation plan and specific implementation plan five is that by replacing the water cooling method on the cooling side with the air cooling method, the system cooling structure is simplified, the dependence on the external cooling water source is avoided, the system layout flexibility and operational adaptability are improved, and it is also suitable for portable or assembled heat pump experimental platforms.

[0076] The other combinations and connection relationships of this embodiment are the same as those of the specific embodiment five.

[0077] Although the present invention is disclosed as above, the scope of protection disclosed by the present invention is not limited thereto. Those skilled in the art of the present invention may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A high-temperature steam heat pump test system for an exhaust steam source based on heat energy recycling, characterized by: The invention comprises a condenser (1), a first expansion valve (2), a second expansion valve (3), a liquid storage tank (4), an evaporator (5), a first compressor (6), a second compressor (7), a water spray cooling tank (8), a steam pressure reducing valve (9), a cooling radiator (10), a first circulating pump (21), a first regulating valve (23), a second regulating valve (24), a third regulating valve (25), a fourth regulating valve (26) and a baffle (29). The refrigerant outlet of the evaporator (5) is connected to the inlet of the first compressor (6), the outlet of the first compressor (6) is connected to the left air inlet of the water spray cooling tank (8), the top outlet of the water spray cooling tank (8) is connected to the inlet of the second compressor (7), the outlet of the second compressor (7) is connected to the refrigerant inlet of the condenser (1), the refrigerant outlet of the condenser (1) is respectively connected to the upper right water inlet of the water spray cooling tank (8) and the liquid inlet of the second expansion valve (3), and a pipe connecting the refrigerant outlet of the condenser (1) and the upper right water inlet of the water spray cooling tank (8) is provided. The first regulating valve (23) and the outlet of the second expansion valve (3) are connected to the top liquid inlet of the liquid storage tank (4) and immersed below the liquid level in the liquid storage tank (4). The left steam outlet of the liquid storage tank (4) is connected to the right steam inlet of the water spray cooling tank (8). The baffle (29) is arranged between the water inlet and the steam inlet of the water spray cooling tank (8). The bottom water outlet of the water spray cooling tank (8) is connected to the lower left water inlet of the liquid storage tank (4). The bottom liquid outlet of the liquid storage tank (4) is connected to the liquid inlet of the first expansion valve (2). The outlet of the first expansion valve (2) is connected to the refrigerant inlet end of the evaporator (5). The steam supply outlet of the condenser (1) is connected to the steam inlet of the steam pressure reducing valve (9), and the steam outlet of the steam pressure reducing valve (9) is respectively connected to the low-level hot water inlet end of the evaporator (5) and the low-level hot water inlet end of the cooling radiator (10). A third regulating valve (25) is provided on the pipeline connecting the steam outlet of the steam pressure reducing valve (9) and the low-level hot water inlet end of the evaporator (5). A fourth regulating valve (26) is provided on the pipeline connecting the steam outlet of the steam pressure reducing valve (9) and the low-level hot water inlet end of the cooling radiator (10). The low-level hot water outlet end of the cooling radiator (10) and the low-level hot water outlet end of the evaporator (5) are merged and then connected to the inlet end of the first circulating pump (21). The outlet end of the first circulating pump (21) is connected to the liquid supply inlet end of the condenser (1). A second regulating valve (24) is provided on the pipeline connecting the outlet end of the first circulating pump (21) and the liquid supply inlet end of the condenser (1). The cooling radiator (10) is provided with a cooling water inlet end and a cooling water outlet end.

2. The exhaust steam source high-temperature steam heat pump test system based on heat energy recycling according to claim 1 is characterized in that: It also includes a water mixing and cooling tank (11) and a stop valve (27). The steam outlet of the steam pressure reducing valve (9) is connected to the top inlet of the mixing water cooling tank (11), the natural cooling water is connected to the left water inlet of the mixing water cooling tank (11), a stop valve (27) is provided on the pipeline for inputting the natural cooling water, the right liquid outlet of the mixing water cooling tank (11) is connected to the low-level hot water inlet of the evaporator (5) and the low-level hot water inlet of the cooling radiator (10), respectively, a third regulating valve (25) is provided on the pipeline connecting the right liquid outlet of the mixing water cooling tank (11) and the low-level hot water inlet of the evaporator (5), a fourth regulating valve (26) is provided on the pipeline connecting the right liquid outlet of the mixing water cooling tank (11) and the low-level hot water inlet of the cooling radiator (10), and waste water is discharged from the high-temperature side pipeline of the cooling radiator (10).

3. The exhaust steam source high-temperature steam heat pump test system based on heat energy recycling according to claim 2 is characterized in that: It also includes a heating liquid storage tank (12), The low-level hot water outlet of the cooling radiator (10) is connected to the low-level hot water outlet of the evaporator (5) and then connected to the left liquid inlet of the heating liquid storage tank (12). The right liquid outlet of the heating liquid storage tank (12) is connected to the inlet of the second regulating valve (24).

4. A high-temperature steam heat pump test system for an exhaust steam source based on heat energy recycling, characterized by: The invention comprises a condenser (1), a first expansion valve (2), a second expansion valve (3), a liquid storage tank (4), an evaporator (5), a first compressor (6), a second compressor (7), a water spray cooling tank (8), a cooling radiator (10), a steam-water heat exchanger (13), a second circulating pump (22), a first regulating valve (23) and a baffle (29). The refrigerant outlet of the evaporator (5) is connected to the inlet of the first compressor (6), the outlet of the first compressor (6) is connected to the left air inlet of the water spray cooling tank (8), the top outlet of the water spray cooling tank (8) is connected to the inlet of the second compressor (7), the outlet of the second compressor (7) is connected to the refrigerant inlet of the condenser (1), the refrigerant outlet of the condenser (1) is respectively connected to the upper right water inlet of the water spray cooling tank (8) and the liquid inlet of the second expansion valve (3), and a pipe connecting the refrigerant outlet of the condenser (1) and the upper right water inlet of the water spray cooling tank (8) is provided. The first regulating valve (23) and the outlet end of the second expansion valve (3) are connected to the top liquid inlet of the liquid storage tank (4) and immersed below the liquid level in the liquid storage tank (4). The left steam outlet of the liquid storage tank (4) is connected to the right steam inlet of the water spray cooling tank (8). The baffle (29) is arranged between the water inlet and the steam inlet of the water spray cooling tank (8). The bottom water outlet of the water spray cooling tank (8) is connected to the lower left water inlet of the liquid storage tank (4). The bottom liquid outlet of the liquid storage tank (4) is connected to the liquid inlet of the first expansion valve (2). The outlet of the first expansion valve (2) is connected to the refrigerant inlet end of the evaporator (5). The steam supply outlet of the condenser (1) is connected to the upper left steam inlet of the steam-water heat exchanger (13), and the bottom condensate outlet of the steam-water heat exchanger (13) is connected to the condensate inlet of the condenser (1). The hot water outlet on the right side of the steam-water heat exchanger (13) is connected to the hot water inlet of the cooling radiator (10), and the hot water outlet of the cooling radiator (10) is connected to the low-level hot water inlet of the evaporator (5). A second circulation pump (22) is provided on the pipeline connecting the hot water outlet of the cooling radiator (10) and the low-level hot water inlet of the evaporator (5), and the low-level hot water outlet of the evaporator (5) is connected to the hot water inlet on the right side of the steam-water heat exchanger (13).

5. The exhaust steam source high-temperature steam heat pump test system based on heat energy recycling according to claim 4 is characterized in that: Also included is a bypass valve (28), The low-level hot water outlet of the evaporator (5) is connected to the hot water inlet on the right side of the steam-water heat exchanger (13) and the inlet of the bypass valve (28), respectively. The outlet of the bypass valve (28) is connected to the hot water outlet on the right side of the steam-water heat exchanger (13) and then to the hot water inlet of the cooling radiator (10).

6. The exhaust steam source high-temperature steam heat pump test system based on heat energy recycling according to claim 5, characterized in that: The cooling radiator (10) is provided with a cooling water inlet end and a cooling water outlet end.

7. The exhaust steam source high-temperature steam heat pump test system based on heat energy recycling according to claim 5 is characterized in that: Also included is a fan coil unit (14), The inlet end of the fan coil unit (14) is connected to the cooling side of the cooling radiator (10).

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