An internal source coupling cycle type all-electric process system with a preheater

Abstract

The application provides an endogenous coupling circulating type all-electric process system with a preheater, and belongs to the field of cascade heat pumps. In order to solve the problems of insufficient waste heat recovery of cooling water, large temperature drop, low heat exchange efficiency and high consumption of external heat source caused by independent operation of the existing heat pump process heat supply and terminal cooling water circulation, the application comprises a condenser, a condensing evaporator, a preheater, a compressor, an expansion valve, an air-cooled radiator, a process heat exchange device, a circulating pump and a regulating valve; a multi-path heating water shunt design is adopted, and corresponding backwater temperatures are respectively arranged to realize accurate matching of the heat demand of various processes; after the cooling water is stepwise heated by the process terminal waste heat, one path stably discharges heat through the radiator, and the other path flows through the preheater to realize multi-stage waste heat recovery and effectively balance the system energy flow; or a steam-water heat exchanger is additionally arranged to directly provide high-temperature hot water to the process side; or the air-cooled radiator is replaced by a water-cooled radiator, and the water-cooled radiator has high heat exchange efficiency and stable heat exchange performance.

Description

Technical Field

[0001] This invention relates to the field of cascade heat pump technology, and more specifically, to an endogenous coupled cycle all-electric process system with a preheater. Background Technology

[0002] In industrial production, heat pump systems are widely used to provide thermal support for various process cycles. However, in existing technologies, heat pump systems often operate independently from process cycles and their terminal cooling water cycles. This results in the ineffective recovery and utilization of waste heat in the terminal cooling water, leading to energy waste and reduced system efficiency. Particularly in the heat exchange stages of condensers and evaporators, the lack of proper heat pretreatment results in insufficient cooling water temperature rise, limiting refrigerant heating efficiency and affecting overall system performance and heating stability. Furthermore, the significant temperature drop of the terminal cooling water often necessitates the use of large external heat sources, increasing operating costs and energy consumption. The lack of preheaters and other auxiliary equipment on the condenser and evaporator sides prevents the implementation of stepped temperature increases in the cooling water and multi-stage waste heat recovery, making it difficult to meet the precise heating needs of multi-temperature-zone processes.

[0003] Therefore, there is an urgent need for a technical solution that can achieve deep coupling of refrigerant circulation, process heating circulation and cooling water circulation. By setting up a preheater, the cooling water circulation system can recover the waste heat at the end of the process, and the heated cooling water can be introduced into the evaporator to heat the refrigerant, so as to realize the cascade utilization and circulation of energy, improve the energy utilization rate and operational stability of the system, and thus meet the heating needs of multiple processes and multiple temperature zones. Summary of the Invention

[0004] The technical problem to be solved by this invention is:

[0005] To address the problems of insufficient waste heat recovery from cooling water, large temperature drop, low heat exchange efficiency, and high external heat source consumption caused by the independent operation of existing heat pump processes for heating and terminal cooling water circulation.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0007] This invention provides an endogenous coupled circulation all-electric process system with a preheater, comprising a condenser, a condenser-evaporator, an evaporator, a first preheater, a first compressor, a second compressor, a first expansion valve, a second expansion valve, an air-cooled radiator, a heat exchange device for distillation, a heat exchange device for concentration, a heat exchange device for extraction, a first circulation pump, a second circulation pump, a first regulating valve, a second regulating valve, a third regulating valve, a fourth regulating valve, and a fifth regulating valve.

[0008] The refrigerant outlet of the evaporator is connected to the inlet of the first compressor. The outlet of the first compressor is connected to the high-temperature refrigerant inlet of the condenser-evaporator. The high-temperature refrigerant outlet of the condenser-evaporator is connected to the inlet of the second expansion valve. The outlet of the second expansion valve is connected to the refrigerant inlet of the evaporator.

[0009] The refrigerant outlet on the low-temperature side of the condenser-evaporator is connected to the inlet of the second compressor. The outlet of the second compressor is connected to the refrigerant inlet of the condenser. The refrigerant outlet of the condenser is connected to the refrigerant inlet of the first preheater. The refrigerant outlet of the first preheater is connected to the inlet of the first expansion valve. The outlet of the first expansion valve is connected to the refrigerant inlet on the low-temperature side of the condenser-evaporator.

[0010] The condenser's heating outlet is connected to the hot water inlet of the distillation heat exchanger, the concentration heat exchanger, and the extraction heat exchanger, respectively. A first circulation pump is installed on the pipeline connected to the condenser's heating outlet. A first regulating valve, a second regulating valve, and a third regulating valve are respectively installed on the pipelines connected to the corresponding hot water inlets of the distillation, concentration, and extraction heat exchangers. After flowing through the extraction heat exchanger, the flow merges with the flow through the concentration heat exchanger. This merged pipeline then connects to the condenser's heating inlet after merging with the flow through the distillation heat exchanger.

[0011] The cooling outlet of the distillation heat exchanger is connected to the cooling inlet of the concentration heat exchanger. The cooling outlet of the concentration heat exchanger is connected to the cooling inlet of the extraction heat exchanger. The cooling outlet of the extraction heat exchanger is connected to the inlet of the air-cooled radiator and the hot water inlet of the first preheater. A fourth regulating valve is installed on the pipeline connecting the cooling outlet of the extraction heat exchanger to the inlet of the air-cooled radiator. A fifth regulating valve is installed on the pipeline connecting the cooling outlet of the extraction heat exchanger to the hot water inlet of the first preheater. The hot water outlet of the first preheater is connected to the hot water inlet of the evaporator. The hot water outlet of the evaporator and the outlet of the air-cooled radiator merge and are then connected to the cooling inlet of the distillation heat exchanger. A second circulating pump is installed on the merged pipeline.

[0012] An endogenous coupled circulation all-electric process system with a preheater includes a condenser, a condenser-evaporator, an evaporator, a second preheater, a first compressor, a second compressor, a first expansion valve, a second expansion valve, an air-cooled radiator, a heat exchange device for distillation, a heat exchange device for concentration, a heat exchange device for extraction, a first circulation pump, a second circulation pump, a first regulating valve, a second regulating valve, a third regulating valve, a fourth regulating valve, and a fifth regulating valve.

[0013] The refrigerant outlet of the evaporator is connected to the inlet of the first compressor. The outlet of the first compressor is connected to the high-temperature refrigerant inlet of the condenser-evaporator. The high-temperature refrigerant outlet of the condenser-evaporator is connected to the refrigerant inlet of the second preheater. The refrigerant outlet of the second preheater is connected to the inlet of the second expansion valve. The outlet of the second expansion valve is connected to the refrigerant inlet of the evaporator.

[0014] The refrigerant outlet on the low-temperature side of the condenser / evaporator is connected to the inlet of the second compressor. The outlet of the second compressor is connected to the refrigerant inlet of the condenser. The refrigerant outlet of the condenser is connected to the inlet of the first expansion valve. The outlet of the first expansion valve is connected to the refrigerant inlet on the low-temperature side of the condenser / evaporator.

[0015] The condenser's heat outlet is connected to the hot water inlet of the distillation heat exchanger, the concentration heat exchanger, and the extraction heat exchanger, respectively. A first circulation pump is installed on the pipeline connected to the condenser's heat outlet. A first regulating valve, a second regulating valve, and a third regulating valve are respectively installed on the pipelines connected to the corresponding hot water inlets of the distillation, concentration, and extraction heat exchangers. The pipeline flowing through the extraction heat exchanger merges with the pipeline flowing through the concentration heat exchanger, and the merged pipeline merges with the pipeline flowing through the distillation heat exchanger before connecting to the condenser's heat inlet.

[0016] The cooling outlet of the distillation heat exchanger is connected to the cooling inlet of the concentration heat exchanger. The cooling outlet of the concentration heat exchanger is connected to the cooling inlet of the extraction heat exchanger. The cooling outlet of the extraction heat exchanger is connected to the inlet of the air-cooled radiator and the hot water inlet of the second preheater. A fourth regulating valve is installed on the pipeline connecting the cooling outlet of the extraction heat exchanger to the inlet of the air-cooled radiator. A fifth regulating valve is installed on the pipeline connecting the cooling outlet of the extraction heat exchanger to the hot water inlet of the second preheater. The hot water outlet of the second preheater is connected to the hot water inlet of the evaporator. The hot water outlet of the evaporator and the outlet of the air-cooled radiator merge and are then connected to the cooling inlet of the distillation heat exchanger. A second circulating pump is installed on the merged pipeline.

[0017] Furthermore, it also includes a third preheater and a sixth regulating valve.

[0018] The refrigerant outlet of the condenser is connected to the inlet of the third preheater, and the refrigerant outlet of the third preheater is connected to the inlet of the first expansion valve.

[0019] A sixth regulating valve is installed on the pipeline connecting the outlet end of the heat exchange equipment in the extraction process to the inlet end of the third preheater. The hot water outlet end of the third preheater is connected to the hot water inlet end of the second preheater.

[0020] An endogenous coupled circulation all-electric process system with a preheater includes a condenser, a condenser-evaporator, an evaporator, a second preheater, a first compressor, a second compressor, a first expansion valve, a second expansion valve, an air-cooled radiator, a steam-water heat exchanger, a distillation process heat exchanger, a concentration process heat exchanger, an extraction process heat exchanger, a third preheater, a first circulation pump, a second circulation pump, a first regulating valve, a second regulating valve, a third regulating valve, a fourth regulating valve, and a sixth regulating valve.

[0021] The refrigerant outlet of the evaporator is connected to the inlet of the first compressor. The outlet of the first compressor is connected to the high-temperature refrigerant inlet of the condenser-evaporator. The high-temperature refrigerant outlet of the condenser-evaporator is connected to the refrigerant inlet of the second preheater. The refrigerant outlet of the second preheater is connected to the inlet of the second expansion valve. The outlet of the second expansion valve is connected to the refrigerant inlet of the evaporator.

[0022] The refrigerant outlet on the low-temperature side of the condenser-evaporator is connected to the inlet of the second compressor. The outlet of the second compressor is connected to the refrigerant inlet of the condenser. The refrigerant outlet of the condenser is connected to the refrigerant inlet of the third preheater. The refrigerant outlet of the third preheater is connected to the inlet of the first expansion valve. The outlet of the first expansion valve is connected to the refrigerant inlet on the low-temperature side of the condenser-evaporator.

[0023] The condenser's heating outlet is connected to the high-temperature steam inlet of the steam-water heat exchanger, and the steam-water heat exchanger's high-temperature condensate outlet is connected to the condenser's heating inlet.

[0024] The heat supply outlet of the steam-water heat exchanger is connected to the hot water inlet of the distillation heat exchanger, the concentration heat exchanger, and the extraction heat exchanger, respectively. A first circulation pump is installed on the pipeline connected to the heat supply outlet of the steam-water heat exchanger. A first regulating valve, a second regulating valve, and a third regulating valve are respectively installed on the pipelines connected to the hot water inlets of the distillation, concentration, and extraction heat exchangers. The pipeline flowing through the extraction heat exchanger merges with the pipeline flowing through the concentration heat exchanger, and the merged pipeline merges with the pipeline flowing through the distillation heat exchanger before connecting to the heat supply inlet of the steam-water heat exchanger.

[0025] The cooling outlet of the distillation heat exchanger is connected to the cooling inlet of the concentration heat exchanger. The cooling outlet of the concentration heat exchanger is connected to the cooling inlet of the extraction heat exchanger. The cooling outlet of the extraction heat exchanger is connected to the inlet of the air-cooled radiator and the hot water inlet of the third preheater. A fourth regulating valve is installed on the pipeline connecting the cooling outlet of the extraction heat exchanger to the inlet of the air-cooled radiator. A sixth regulating valve is installed on the pipeline connecting the cooling outlet of the extraction heat exchanger to the hot water inlet of the third preheater. The hot water outlet of the third preheater is connected to the hot water inlet of the second preheater. The hot water outlet of the second preheater is connected to the hot water inlet of the evaporator. The hot water outlet of the evaporator and the outlet of the air-cooled radiator merge and are then connected to the cooling inlet of the distillation heat exchanger. A second circulating pump is installed on the merged pipeline.

[0026] An endogenous coupled circulation all-electric process system with a preheater includes a condenser, a condenser-evaporator, an evaporator, a second preheater, a first compressor, a second compressor, a first expansion valve, a second expansion valve, a water-cooled heat exchanger, a steam-water heat exchanger, heat exchange equipment for distillation, heat exchange equipment for concentration, heat exchange equipment for extraction, a third preheater, a first circulation pump, a second circulation pump, a first regulating valve, a second regulating valve, a third regulating valve, a fourth regulating valve, and a sixth regulating valve.

[0027] The refrigerant outlet of the evaporator is connected to the inlet of the first compressor. The outlet of the first compressor is connected to the high-temperature refrigerant inlet of the condenser-evaporator. The high-temperature refrigerant outlet of the condenser-evaporator is connected to the refrigerant inlet of the second preheater. The refrigerant outlet of the second preheater is connected to the inlet of the second expansion valve. The outlet of the second expansion valve is connected to the refrigerant inlet of the evaporator.

[0028] The refrigerant outlet on the low-temperature side of the condenser-evaporator is connected to the inlet of the second compressor. The outlet of the second compressor is connected to the refrigerant inlet of the condenser. The refrigerant outlet of the condenser is connected to the refrigerant inlet of the third preheater. The refrigerant outlet of the third preheater is connected to the inlet of the first expansion valve. The outlet of the first expansion valve is connected to the refrigerant inlet on the low-temperature side of the condenser-evaporator.

[0029] The condenser's heating outlet is connected to the high-temperature steam inlet of the steam-water heat exchanger, and the steam-water heat exchanger's high-temperature condensate outlet is connected to the condenser's heating inlet.

[0030] The heat supply outlet of the steam-water heat exchanger is connected to the hot water inlet of the distillation heat exchanger, the concentration heat exchanger, and the extraction heat exchanger, respectively. A first circulation pump is installed on the pipeline connected to the heat supply outlet of the steam-water heat exchanger. A first regulating valve, a second regulating valve, and a third regulating valve are respectively installed on the pipelines connected to the hot water inlets of the distillation, concentration, and extraction heat exchangers. The pipeline flowing through the extraction heat exchanger merges with the pipeline flowing through the concentration heat exchanger, and the merged pipeline merges with the pipeline flowing through the distillation heat exchanger before connecting to the heat supply inlet of the steam-water heat exchanger.

[0031] The cooling outlet of the distillation heat exchanger is connected to the cooling inlet of the concentration heat exchanger. The cooling outlet of the concentration heat exchanger is connected to the cooling inlet of the extraction heat exchanger. The cooling outlet of the extraction heat exchanger is connected to the inlet of the water-cooled heat exchanger and the hot water inlet of the third preheater. A fourth regulating valve is installed on the pipeline connecting the cooling outlet of the extraction heat exchanger to the inlet of the water-cooled heat exchanger. A sixth regulating valve is installed on the pipeline connecting the cooling outlet of the extraction heat exchanger to the hot water inlet of the third preheater. The hot water outlet of the third preheater is connected to the hot water inlet of the second preheater. The hot water outlet of the second preheater is connected to the hot water inlet of the evaporator. The hot water outlet of the evaporator and the outlet of the water-cooled heat exchanger merge and connect to the cooling inlet of the distillation heat exchanger. A second circulating pump is installed on the merged pipeline.

[0032] The water-cooled heat exchanger is equipped with a low-temperature water cooling inlet pipe and a low-temperature water cooling outlet pipe.

[0033] Compared with the prior art, the beneficial effects of the present invention are:

[0034] (1) In view of the energy waste caused by the direct discharge or single recovery of the waste heat of the end cooling of traditional processes, the present invention combines the cooling water circulation system, the process heating circulation and the refrigerant circulation system. The cooling water recovers the heat of the end of the process, enters the evaporator for heat exchange after preheating, and is heated by the heat pump to supply heat to the process end, thus completing the energy recycling and realizing the deep coupling and utilization of the three circulation forms, which significantly improves the energy utilization rate and overall thermal efficiency of the system.

[0035] (2) The present invention adopts a dual-stage compression and dual-cycle cascade heat pump structure. The low-temperature cycle and the high-temperature cycle transfer energy through the condenser-evaporator to achieve a greater temperature difference increase and high-temperature heating. At the same time, in response to the process requirements of three different temperature zones, namely distillation, concentration and extraction, the present invention adopts a multi-channel hot water supply design and sets corresponding return water temperatures (85℃, 80℃, 60℃) to accurately match the heat requirements of various processes, reduce ineffective overheating, and improve the matching degree and stability of heating.

[0036] (3) The process cooling water in the prior art has a large temperature drop and requires a large amount of external heat source for heat replenishment. In order to improve the problems of poor heat exchange effect and unstable operation caused by the large temperature difference of the cooling water, the present invention divides the three types of process terminal cooling water into two paths after the temperature is stepped up: one path is stably discharged through the radiator, and the other path flows further through the preheater set at the outlet of the condenser and the condenser-evaporator. While preheating the cooling water, the refrigerant is circulated and subcooled, realizing multi-stage recovery of waste heat and effectively balancing the system energy flow, ensuring that the system can operate stably under different load conditions.

[0037] (4) The present invention adds a steam-water heat exchanger on the condenser side, and uses high-temperature steam to directly heat the process hot water to the required temperature, and directly provides high-temperature hot water to the process side, which can directly meet the temperature range requirements of different processes, avoid the cumbersome process of setting up temperature reduction and pressure reduction adjustment devices separately for steam heating, and improve the versatility and adaptability of the system.

[0038] (5) The present invention further replaces the low-position air-cooled radiator with a water-cooled radiator. Water-cooled radiator has higher heat exchange efficiency and stable heat exchange performance. It can achieve the same heat dissipation with lower cooling medium flow rate and smaller temperature difference. It can be directly connected to the existing cooling water network, reducing the energy consumption of water pumps and auxiliary equipment, and reducing independent construction and operation costs. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of an endogenous coupled circulation all-electric process system with a preheater according to an embodiment of the present invention. Figure 1 ;

[0040] Figure 2 This is a schematic diagram of the structure of an endogenous coupled circulation all-electric process system with a preheater according to an embodiment of the present invention. Figure 2 ;

[0041] Figure 3 This is a schematic diagram of the structure of an endogenous coupled circulation all-electric process system with a preheater according to an embodiment of the present invention. Figure 3 ;

[0042] Figure 4 This is a schematic diagram of the structure of an endogenous coupled circulation all-electric process system with a preheater according to an embodiment of the present invention. Figure 4 ;

[0043] Figure 5 This is a schematic diagram of the structure of an endogenous coupled circulation all-electric process system with a preheater according to an embodiment of the present invention. Figure 5 .

[0044] Explanation of reference numerals in the attached figures:

[0045] 1. Condenser; 2. Condenser-evaporator; 3. Evaporator; 4. First preheater; 5. Second preheater; 6. First compressor; 7. Second compressor; 8. First expansion valve; 9. Second expansion valve; 10. Air-cooled radiator; 11. Water-cooled heat exchanger; 12. Steam-water heat exchanger; 13. Heat exchange equipment for distillation process; 14. Heat exchange equipment for concentration process; 15. Heat exchange equipment for extraction process; 16. Third preheater; 21. First circulating pump; 22. Second circulating pump; 23. First regulating pump. 24. Second regulating valve; 25. Third regulating valve; 26. Fourth regulating valve; 27. Fifth regulating valve; 28. Sixth regulating valve; 31. First refrigerant gaseous pipeline; 32. Second refrigerant gaseous pipeline; 33. First refrigerant liquid pipeline; 34. First refrigerant gas-liquid two-phase pipeline; 35. Third refrigerant gaseous pipeline; 36. Fourth refrigerant gaseous pipeline; 37. Second refrigerant liquid pipeline; 38. Second refrigerant gas-liquid two-phase pipeline; 39. Third refrigerant liquid pipeline 40. Fourth refrigerant liquid pipeline; 41. High-temperature steam pipeline; 42. High-temperature condensate 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 cooling water pipeline; 62. Second cooling water pipeline; 63. Third cooling water pipeline; Water pipes; 64. Fourth cooling water pipe; 65. Fifth cooling water pipe; 66. First preheating water pipe; 67. Second preheating water pipe; 68. Third preheating water pipe; 69. Fourth preheating water pipe; 70. Fifth preheating water pipe; 71. Sixth cooling water pipe; 72. Seventh cooling water pipe; 81. First low-temperature water cooling pipe; 82. Second low-temperature water cooling pipe; 83. Fifth refrigerant liquid pipe; 84. Sixth refrigerant liquid pipe; 85. Sixth preheating water pipe. Detailed Implementation

[0046] In the description of this invention, it should be noted that the terms used in the various embodiments, such as "upper," "lower," "front," "rear," "left," and "right," which indicate orientation, are only used to simplify the description of the positional relationships based on the accompanying drawings and do not mean that the components and devices referred to must be operated in accordance with the specific orientations and defined operations, methods, and structures in the specification. Such directional terms do not constitute a limitation of this invention.

[0047] In the description of this invention, it should be noted that the terms "first," "second," and "third" mentioned in the embodiments of this invention are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," and "third" may explicitly or implicitly include one or more of that feature.

[0048] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0049] This invention provides an endogenous coupled circulation all-electric process system with a preheater, comprising a condenser 1, a condenser-evaporator 2, an evaporator 3, a first preheater 4, a first compressor 6, a second compressor 7, a first expansion valve 8, a second expansion valve 9, an air-cooled radiator 10, a distillation process heat exchanger 13, a concentration process heat exchanger 14, an extraction process heat exchanger 15, a first circulation pump 21, a second circulation pump 22, a first regulating valve 23, a second regulating valve 24, a third regulating valve 25, a fourth regulating valve 26, a fifth regulating valve 27, a first refrigerant gaseous pipeline 31, a second refrigerant gaseous pipeline 32, a first refrigerant liquid pipeline 33, a first refrigerant gas-liquid two-phase pipeline 34, and a third refrigerant gaseous pipeline. Pipeline 35, fourth refrigerant gaseous pipeline 36, second refrigerant liquid pipeline 37, second refrigerant gas-liquid two-phase pipeline 38, third refrigerant liquid pipeline 39, first heating pipeline 51, second heating pipeline 52, third heating pipeline 53, fourth heating pipeline 54, fifth heating pipeline 55, sixth heating pipeline 56, seventh heating pipeline 57, eighth heating pipeline 58, ninth heating pipeline 59, tenth heating pipeline 60, first cooling water pipeline 61, second cooling water pipeline 62, third cooling water pipeline 63, fourth cooling water pipeline 64, fifth cooling water pipeline 65, first preheating water pipeline 66, second preheating water pipeline 67, sixth cooling water pipeline 71 and seventh cooling water pipeline 72,

[0050] The refrigerant outlet of evaporator 3 is connected to the inlet of the first refrigerant gaseous pipeline 31. The outlet of the first refrigerant gaseous pipeline 31 is connected to the inlet of the first compressor 6. The outlet of the first compressor 6 is connected to the inlet of the second refrigerant gaseous pipeline 32. The outlet of the second refrigerant gaseous pipeline 32 is connected to the refrigerant inlet on the high-temperature side of the condenser-evaporator 2. The refrigerant outlet on the high-temperature side of the condenser-evaporator 2 is connected to the inlet of the first refrigerant liquid pipeline 33. The outlet of the first refrigerant liquid pipeline 33 is connected to the inlet of the second expansion valve 9. The outlet of the second expansion valve 9 is connected to the inlet of the first refrigerant gas-liquid two-phase pipeline 34. The outlet of the first refrigerant gas-liquid two-phase pipeline 34 is connected to the refrigerant inlet of evaporator 3.

[0051] The low-temperature refrigerant outlet of the condenser-evaporator 2 is connected to the inlet of the third refrigerant gaseous line 35. The outlet of the third refrigerant gaseous line 35 is connected to the inlet of the second compressor 7. The outlet of the second compressor 7 is connected to the inlet of the fourth refrigerant gaseous line 36. The outlet of the fourth refrigerant gaseous line 36 is connected to the refrigerant inlet of the condenser 1. The refrigerant outlet of the condenser 1 is connected to the inlet of the third refrigerant liquid line 39. The outlet of the third refrigerant liquid line 39 is connected to the refrigerant inlet of the first preheater 4. The refrigerant outlet of the first preheater 4 is connected to the inlet of the second refrigerant liquid line 37. The outlet of the second refrigerant liquid line 37 is connected to the inlet of the first expansion valve 8. The outlet of the first expansion valve 8 is connected to the inlet of the second refrigerant gas-liquid two-phase line 38. The outlet of the second refrigerant gas-liquid two-phase line 38 is connected to the low-temperature refrigerant inlet of the condenser-evaporator 2.

[0052] The heat outlet of condenser 1 is connected to the inlet of the first heating pipeline 51. A first circulating pump 21 is installed on the first heating pipeline 51. The outlet of the first heating pipeline 51 is connected to the inlet of the seventh heating pipeline 57 and the inlet of the second heating pipeline 52. A first regulating valve 23 is installed on the seventh heating pipeline 57. The outlet of the seventh heating pipeline 57 is connected to the hot water inlet of the distillation process heat exchanger 13. The hot water outlet of the distillation process heat exchanger 13 is connected to the inlet of the eighth heating pipeline 58. The outlet of the second heating pipeline 52 is connected to the inlet of the ninth heating pipeline 59 and the inlet of the third heating pipeline 53. A second regulating valve 24 is installed on the ninth heating pipeline 59. The outlet of the ninth heating pipeline 59 is connected to the concentrated... The hot water inlet of the heat exchanger 14 for the condensation process is connected to the inlet of the tenth heating pipeline 60. A third regulating valve 25 is installed on the third heating pipeline 53. The outlet of the third heating pipeline 53 is connected to the hot water inlet of the heat exchanger 15 for the extraction process. The hot water outlet of the extraction process heat exchanger 15 is connected to the inlet of the fourth heating pipeline 54. The outlet of the fourth heating pipeline 54 and the outlet of the tenth heating pipeline 60 merge and connect to the inlet of the fifth heating pipeline 55. The outlet of the fifth heating pipeline 55 and the outlet of the eighth heating pipeline 58 merge and connect to the inlet of the sixth heating pipeline 56. The outlet of the sixth heating pipeline 56 is connected to the heating inlet of the condenser 1.

[0053] The cooling outlet of the distillation process heat exchanger 13 is connected to the inlet of the first cooling water pipeline 61. The outlet of the first cooling water pipeline 61 is connected to the cooling inlet of the concentration process heat exchanger 14. The cooling outlet of the concentration process heat exchanger 14 is connected to the inlet of the second cooling water pipeline 62. The outlet of the second cooling water pipeline 62 is connected to the cooling inlet of the extraction process heat exchanger 15. The cooling outlet of the extraction process heat exchanger 15 is connected to the inlet of the third cooling water pipeline 63. The outlet of the third cooling water pipeline 63 is connected to the inlet of the fourth cooling water pipeline 64 and the inlet of the first preheating water pipeline 66. The fourth cooling water pipeline 64 is equipped with a fourth regulating valve 26. The outlet of the fourth cooling water pipeline 64 is connected to the inlet of the air-cooled radiator 10. The outlet of the air-cooled radiator 10 is connected to the inlet of the fifth cooling water pipeline 65.

[0054] A fifth regulating valve 27 is provided on the first preheating water pipe 66. The outlet end of the first preheating water pipe 66 is connected to the hot water inlet end of the first preheater 4. The hot water outlet end of the first preheater 4 is connected to the inlet end of the second preheating water pipe 67. The outlet end of the second preheating water pipe 67 is connected to the hot water inlet end of the evaporator 3. The hot water outlet end of the evaporator 3 is connected to the inlet end of the sixth cooling water pipe 71. The outlet end of the sixth cooling water pipe 71 and the outlet end of the fifth cooling water pipe 65 merge and are connected to the inlet end of the seventh cooling water pipe 72. A second circulating pump 22 is provided on the seventh cooling water pipe 72. The outlet end of the seventh cooling water pipe 72 is connected to the cooling inlet end of the distillation process heat exchange equipment 13.

[0055] The operating principle of the implementation plan:

[0056] The gaseous refrigerant exiting evaporator 3 enters the first compressor 6, where it is compressed and its temperature and pressure increase. It then enters the condenser-evaporator 2 to release its latent heat, heating the low-temperature refrigerant pipeline. The liquid refrigerant exiting the condenser-evaporator 2 enters the second expansion valve 9 for throttling and pressure reduction before entering the evaporator 3 to continue absorbing heat and vaporizing, completing the cycle. The gaseous refrigerant, after absorbing heat in the condenser-evaporator 2, enters the second compressor 7, where it is compressed and its temperature and pressure increase. It then enters the condenser 1 to release its latent heat, and subsequently enters the first preheater 4 to continue releasing heat. Becoming subcooled, it enters the first expansion valve 8 for throttling and pressure reduction before returning to the condenser-evaporator 2 to continue absorbing heat and vaporizing, completing the cycle.

[0057] The hot water supplied after being heated by condenser 1 is divided into three streams, which flow through the distillation process heat exchanger 13, the concentration process heat exchanger 14, and the extraction process heat exchanger 15 respectively, with the same inlet temperature of 90℃, to meet the heat demand of the three processes. Since the three processes require different temperature ranges, the return water temperatures are set to 85℃, 80℃, and 60℃ respectively, so that the supply and return water temperatures of the distillation process are 80℃ / 85℃, the concentration process is 75℃ / 80℃, and the extraction process is 55℃ / 60℃. After the return water is mixed, it flows back to condenser 1 to continue absorbing heat, thus realizing the heat supply cycle.

[0058] The three types of process end-connected cooling water circulation pipelines are used to couple the process cycle with the refrigerant cycle. The cooling water pipelines flow sequentially through the distillation process heat exchanger 13, the concentration process heat exchanger 14, and the extraction process heat exchanger 15 to achieve a step-by-step temperature increase. Excess waste heat is dissipated by entering the air-cooled radiator 10 through one stream of cooling water, while the other stream of cooling water flows through the first preheater 4 for preheating, and then enters the evaporator 3 to heat the refrigerant. The cooling water from the evaporator 3 and the air-cooled radiator 10 mix and continue to enter the end of the process equipment to absorb heat, completing the cooling cycle.

[0059] Overall, the system achieves two key benefits. First, it employs multi-channel heating to address the different heat demand ranges of the three processes, with regenerative temperatures set at 85℃, 80℃, and 60℃ respectively, improving the matching degree of the heating ranges. Second, the mixed heating and return water continues to enter the condenser side for heat exchange, enhancing heat exchange efficiency. Third, the innovative cooling water circulation system addresses the energy waste caused by direct discharge or single recovery of waste heat from traditional cooling water systems. The cooling water first undergoes a stepped temperature rise at the end of the three processes, exchanging heat with the preheater after the condenser, raising the low-temperature heat source temperature entering the evaporator, reducing the evaporator temperature difference, and ensuring the stability of the refrigerant state after subcooling, thus improving the system's control accuracy and operational stability. Finally, the entire system utilizes an electrically driven circulation system, exhibiting high energy efficiency and environmental friendliness.

[0060] This invention significantly improves the efficiency of waste heat recovery and utilization from cooling water at the end of the process by deeply coupling cooling water circulation, refrigerant circulation and process heating circulation, realizing the cascade recovery and recycling of energy, and greatly improving the energy utilization rate and overall thermal efficiency of the system.

[0061] Specific Implementation Plan Two: Combining Figure 2 As shown, this invention provides an internally coupled circulating all-electric process system with a preheater, including a condenser 1, a condenser-evaporator 2, an evaporator 3, a second preheater 5, a first compressor 6, a second compressor 7, a first expansion valve 8, a second expansion valve 9, an air-cooled radiator 10, a distillation process heat exchanger 13, a concentration process heat exchanger 14, an extraction process heat exchanger 15, a first circulating pump 21, a second circulating pump 22, a first regulating valve 23, a second regulating valve 24, a third regulating valve 25, a fourth regulating valve 26, a fifth regulating valve 27, a first refrigerant gaseous pipeline 31, a second refrigerant gaseous pipeline 32, a first refrigerant liquid pipeline 33, a first refrigerant gas-liquid two-phase pipeline 34, and a third refrigerant gaseous pipeline. The following pipelines are listed: 35 (gas phase), 36 (gas phase), 37 (liquid phase), 38 (gas phase), 40 (liquid phase), 51 (heating), 52 (heating), 53 (heating), 54 (heating), 55 (heating), 56 (heating), 57 (heating), 58 (heating), 59 (heating), 60 (heating), 61 (cooling water), 62 (cooling water), 63 (cooling water), 64 (cooling water), 65 (cooling water), 68 (preheating water), 69 (preheating water), 71 (cooling water), and 72 (cooling water).

[0062] The refrigerant outlet of evaporator 3 is connected to the inlet of the first refrigerant gaseous pipeline 31. The outlet of the first refrigerant gaseous pipeline 31 is connected to the inlet of the first compressor 6. The outlet of the first compressor 6 is connected to the inlet of the second refrigerant gaseous pipeline 32. The outlet of the second refrigerant gaseous pipeline 32 is connected to the refrigerant inlet on the high-temperature side of the condenser-evaporator 2. The refrigerant outlet on the high-temperature side of the condenser-evaporator 2 is connected to the inlet of the fourth refrigerant liquid pipeline 40. The outlet of the fourth refrigerant liquid pipeline 40 is connected to the refrigerant inlet of the second preheater 5. The refrigerant outlet of the second preheater 5 is connected to the inlet of the first refrigerant liquid pipeline 33. The outlet of the first refrigerant liquid pipeline 33 is connected to the inlet of the second expansion valve 9. The outlet of the second expansion valve 9 is connected to the inlet of the first refrigerant gas-liquid two-phase pipeline 34. The outlet of the first refrigerant gas-liquid two-phase pipeline 34 is connected to the refrigerant inlet of evaporator 3.

[0063] The low-temperature refrigerant outlet of the condenser-evaporator 2 is connected to the inlet of the third refrigerant gaseous line 35. The outlet of the third refrigerant gaseous line 35 is connected to the inlet of the second compressor 7. The outlet of the second compressor 7 is connected to the inlet of the fourth refrigerant gaseous line 36. The outlet of the fourth refrigerant gaseous line 36 is connected to the refrigerant inlet of the condenser 1. The refrigerant outlet of the condenser 1 is connected to the inlet of the second refrigerant liquid line 37. The outlet of the second refrigerant liquid line 37 is connected to the inlet of the first expansion valve 8. The outlet of the first expansion valve 8 is connected to the inlet of the second refrigerant gas-liquid two-phase line 38. The outlet of the second refrigerant gas-liquid two-phase line 38 is connected to the low-temperature refrigerant inlet of the condenser-evaporator 2.

[0064] The heat outlet of condenser 1 is connected to the inlet of the first heating pipeline 51. A first circulating pump 21 is installed on the first heating pipeline 51. The outlet of the first heating pipeline 51 is connected to the inlet of the seventh heating pipeline 57 and the inlet of the second heating pipeline 52. A first regulating valve 23 is installed on the seventh heating pipeline 57. The outlet of the seventh heating pipeline 57 is connected to the hot water inlet of the distillation process heat exchanger 13. The hot water outlet of the distillation process heat exchanger 13 is connected to the inlet of the eighth heating pipeline 58. The outlet of the second heating pipeline 52 is connected to the inlet of the ninth heating pipeline 59 and the inlet of the third heating pipeline 53. A second regulating valve 24 is installed on the ninth heating pipeline 59. The outlet of the ninth heating pipeline 59 is connected to the concentrated... The hot water inlet of the heat exchanger 14 for the condensation process is connected to the inlet of the tenth heating pipeline 60. A third regulating valve 25 is installed on the third heating pipeline 53. The outlet of the third heating pipeline 53 is connected to the hot water inlet of the heat exchanger 15 for the extraction process. The hot water outlet of the extraction process heat exchanger 15 is connected to the inlet of the fourth heating pipeline 54. The outlet of the fourth heating pipeline 54 and the outlet of the tenth heating pipeline 60 merge and connect to the inlet of the fifth heating pipeline 55. The outlet of the fifth heating pipeline 55 and the outlet of the eighth heating pipeline 58 merge and connect to the inlet of the sixth heating pipeline 56. The outlet of the sixth heating pipeline 56 is connected to the heating inlet of the condenser 1.

[0065] The cooling outlet of the distillation process heat exchanger 13 is connected to the inlet of the first cooling water pipeline 61. The outlet of the first cooling water pipeline 61 is connected to the cooling inlet of the concentration process heat exchanger 14. The cooling outlet of the concentration process heat exchanger 14 is connected to the inlet of the second cooling water pipeline 62. The outlet of the second cooling water pipeline 62 is connected to the cooling inlet of the extraction process heat exchanger 15. The cooling outlet of the extraction process heat exchanger 15 is connected to the inlet of the third cooling water pipeline 63. The outlet of the third cooling water pipeline 63 is connected to the inlet of the fourth cooling water pipeline 64 and the inlet of the third preheating water pipeline 68. The fourth cooling water pipeline 64 is equipped with a fourth regulating valve 26. The outlet of the fourth cooling water pipeline 64 is connected to the inlet of the air-cooled radiator 10. The outlet of the air-cooled radiator 10 is connected to the inlet of the fifth cooling water pipeline 65.

[0066] The third preheating water pipe 68 is equipped with a fifth regulating valve 27. The outlet end of the third preheating water pipe 68 is connected to the hot water inlet end of the second preheater 5. The hot water outlet end of the second preheater 5 is connected to the inlet end of the fourth preheating water pipe 69. The outlet end of the fourth preheating water pipe 69 is connected to the hot water inlet end of the evaporator 3. The hot water outlet end of the evaporator 3 is connected to the inlet end of the sixth cooling water pipe 71. The outlet end of the sixth cooling water pipe 71 and the outlet end of the fifth cooling water pipe 65 merge and are connected to the inlet end of the seventh cooling water pipe 72. The seventh cooling water pipe 72 is equipped with a second circulating pump 22. The outlet end of the seventh cooling water pipe 72 is connected to the cooling inlet end of the distillation process heat exchange equipment 13.

[0067] The operating principle of this implementation plan is as follows:

[0068] The gaseous refrigerant exiting evaporator 3 enters the first compressor 6, where it is compressed and its temperature and pressure increase. It then enters the condenser-evaporator 2 to release latent heat, heating the low-temperature refrigerant pipeline. The liquid refrigerant exiting the condenser-evaporator 2 enters the second preheater 5 to continue releasing heat, becoming subcooled before entering the second expansion valve 9 for throttling and pressure reduction. It then enters the evaporator 3 to continue absorbing heat and vaporizing, completing the cycle. The gaseous refrigerant, after absorbing heat in the condenser-evaporator 2, enters the second compressor 7, where it is compressed and its temperature and pressure increase. It then enters the condenser 1 to release latent heat, subsequently entering the first expansion valve 8 for throttling and pressure reduction, returning to the condenser-evaporator 2 to continue absorbing heat and vaporizing, completing the cycle.

[0069] The hot water supplied after being heated by condenser 1 is divided into three streams, which flow through the distillation process heat exchanger 13, the concentration process heat exchanger 14, and the extraction process heat exchanger 15 respectively, with the same inlet temperature of 90℃, to meet the heat demand of the three processes. Since the three processes require different temperature ranges, the return water temperatures are set to 85℃, 80℃, and 60℃ respectively, so that the supply and return water temperatures of the distillation process are 80℃ / 85℃, the concentration process is 75℃ / 80℃, and the extraction process is 55℃ / 60℃. After the return water is mixed, it flows back to condenser 1 to continue absorbing heat, thus realizing the heat supply cycle.

[0070] The three types of process end-connected cooling water circulation pipelines are used to couple the process cycle with the refrigerant cycle. The cooling water pipelines flow sequentially through the distillation process heat exchanger 13, the concentration process heat exchanger 14, and the extraction process heat exchanger 15 to achieve a temperature gradient increase. Excess waste heat is dissipated by entering the air-cooled radiator 10 through one stream of cooling water, while the other stream of cooling water flows through the second preheater 5 for preheating, and then enters the evaporator 3 to heat the refrigerant. The cooling water from the evaporator 3 and the air-cooled radiator 10 mix and continue to enter the end of the process equipment to absorb heat, completing the cooling cycle.

[0071] Overall, this invention achieves two effects: by using a two-stage compression and dual-cycle cascade heat pump structure, the system heating temperature is increased to the range of 90℃~100℃, which can accurately meet the heat requirements of multi-temperature processes such as distillation, concentration and extraction; by placing the preheater after the condenser-evaporator, the latent heat of vaporization of the liquid refrigerant is utilized more fully after entering the expansion valve, thereby improving the energy efficiency of the low-temperature refrigerant cycle. At the same time, the temperature of the low-temperature heat source water entering the evaporator is increased, thereby improving the thermal cycle efficiency of the heat pump system.

[0072] This invention achieves multi-stage waste heat recovery and energy flow balance through the design of cooling water cascade temperature rise and preheater, reducing dependence on external heat sources, reducing operating costs, and improving the energy-saving and environmental protection performance of the system.

[0073] Specific Implementation Plan Three: Combining Figure 3 As shown, it also includes a third preheater 16, a sixth regulating valve 28, a fifth preheated water pipeline 70, a sixth preheated water pipeline 85, a fifth refrigerant liquid pipeline 83, and a sixth refrigerant liquid pipeline 84.

[0074] The refrigerant outlet of condenser 1 is connected to the inlet of the fifth refrigerant liquid line 83, the outlet of the fifth refrigerant liquid line 83 is connected to the inlet of the third preheater 16, the refrigerant outlet of the third preheater 16 is connected to the inlet of the sixth refrigerant liquid line 84, and the outlet of the sixth refrigerant liquid line 84 is connected to the inlet of the first expansion valve 8.

[0075] A sixth regulating valve 28 is provided on the sixth preheating hot water pipe 85. The outlet end of the sixth preheating hot water pipe 85 is connected to the hot water inlet end of the third preheater 16. The hot water outlet end of the third preheater 16 is connected to the inlet end of the fifth preheating hot water pipe 70. The outlet end of the fifth preheating hot water pipe 70 is connected to the hot water inlet end of the second preheater 5. The hot water outlet end of the second preheater 5 is connected to the inlet end of the fourth preheating hot water pipe 69. The outlet end of the fourth preheating hot water pipe 69 is connected to the hot water inlet end of the evaporator 3.

[0076] The other combinations and connections in this implementation scheme are the same as in Specific Implementation Scheme Two.

[0077] The difference in the operating principle of this implementation scheme lies in the fact that the three types of process terminals are connected to cooling water circulation pipelines to couple the process cycle with the refrigerant cycle. The cooling water pipelines flow sequentially through the distillation process heat exchanger 13, the concentration process heat exchanger 14, and the extraction process heat exchanger 15 to achieve a step-by-step temperature increase. Excess waste heat is dissipated by entering the air-cooled radiator 10 through one stream of cooling water. The other stream of cooling water flows sequentially through the first preheater 4 and the second preheater 5 for preheating. The liquid refrigerant from the condenser 1 and the condenser-evaporator 2 is subcooled to a certain extent and then enters the evaporator 3 to heat the refrigerant. The cooling water from the evaporator 3 and the air-cooled radiator 10 mix and continue to enter the end of the process equipment to absorb heat and complete the cooling cycle.

[0078] Overall, this solution combines the advantages of the two aforementioned solutions. It incorporates dual preheaters to enhance the preheating effect of the cooling water before it enters the evaporator, while simultaneously achieving subcooling for both low-temperature and high-temperature refrigerant cycles. This enables multi-stage waste heat recovery and effectively balances the system's energy flow, ensuring stable operation under varying load conditions. By rationally dividing the cooling water flow path at the process's end, a portion of the cooling water is used for heat dissipation, while the remaining portion is preheated by dual preheaters to enhance its preheating effect before entering the evaporator. This, combined with subcooling for both low-temperature and high-temperature refrigerant cycles, optimizes the system's energy flow balance, reduces dependence on external heat sources, and guarantees stable system operation under different load conditions.

[0079] This invention not only improves the energy-saving and environmental protection performance of heat pump systems, but also enhances the applicability and flexibility of process heating, and has important practical application value and good prospects for promotion.

[0080] Specific Implementation Plan Four: Combining Figure 4As shown, this invention provides an endogenous coupled circulation all-electric process system with a preheater, including a condenser 1, a condenser-evaporator 2, an evaporator 3, a second preheater 5, a first compressor 6, a second compressor 7, a first expansion valve 8, a second expansion valve 9, an air-cooled radiator 10, a steam-water heat exchanger 12, a distillation process heat exchanger 13, a concentration process heat exchanger 14, an extraction process heat exchanger 15, a third preheater 16, a first circulation pump 21, a second circulation pump 22, a first regulating valve 23, a second regulating valve 24, a third regulating valve 25, a fourth regulating valve 26, a sixth regulating valve 28, a first refrigerant gaseous pipeline 31, a second refrigerant gaseous pipeline 32, a first refrigerant liquid pipeline 33, a first refrigerant gas-liquid two-phase pipeline 34, a third refrigerant gaseous pipeline 35, and a fourth refrigerant gaseous pipeline. The pipeline includes: 36 (first phase), 38 (second phase), 40 (fourth phase), 41 (high-temperature steam), 42 (high-temperature condensate), 51 (first heating), 52 (second heating), 53 (third heating), 54 (fourth heating), 55 (fifth heating), 56 (sixth heating), 57 (seventh heating), 58 (eighth heating), 59 (ninth heating), 60 (tenth heating), 61 (first cooling water), 62 (second cooling water), 63 (third cooling water), 64 (fourth cooling water), 65 (fifth cooling water), 69 (fourth preheating water), 70 (fifth preheating water), 71 (sixth cooling water), 72 (seventh cooling water), 83 (fifth refrigerant liquid), 84 (sixth refrigerant liquid), and 85 (sixth preheating water).

[0081] The refrigerant outlet of evaporator 3 is connected to the inlet of the first refrigerant gaseous pipeline 31. The outlet of the first refrigerant gaseous pipeline 31 is connected to the inlet of the first compressor 6. The outlet of the first compressor 6 is connected to the inlet of the second refrigerant gaseous pipeline 32. The outlet of the second refrigerant gaseous pipeline 32 is connected to the refrigerant inlet on the high-temperature side of the condenser-evaporator 2. The refrigerant outlet on the high-temperature side of the condenser-evaporator 2 is connected to the inlet of the fourth refrigerant liquid pipeline 40. The outlet of the fourth refrigerant liquid pipeline 40 is connected to the refrigerant inlet of the second preheater 5. The refrigerant outlet of the second preheater 5 is connected to the inlet of the first refrigerant liquid pipeline 33. The outlet of the first refrigerant liquid pipeline 33 is connected to the inlet of the second expansion valve 9. The outlet of the second expansion valve 9 is connected to the inlet of the first refrigerant gas-liquid two-phase pipeline 34. The outlet of the first refrigerant gas-liquid two-phase pipeline 34 is connected to the refrigerant inlet of evaporator 3.

[0082] The low-temperature refrigerant outlet of the condenser-evaporator 2 is connected to the inlet of the third refrigerant gaseous line 35. The outlet of the third refrigerant gaseous line 35 is connected to the inlet of the second compressor 7. The outlet of the second compressor 7 is connected to the inlet of the fourth refrigerant gaseous line 36. The outlet of the fourth refrigerant gaseous line 36 is connected to the refrigerant inlet of the condenser 1. The refrigerant outlet of the condenser 1 is connected to the inlet of the fifth refrigerant liquid line 83. The outlet of the fifth refrigerant liquid line 83 is connected to the refrigerant inlet of the third preheater 16. The refrigerant outlet of the third preheater 16 is connected to the inlet of the sixth refrigerant liquid line 84. The outlet of the sixth refrigerant liquid line 84 is connected to the inlet of the first expansion valve 8. The outlet of the first expansion valve 8 is connected to the inlet of the second refrigerant gas-liquid two-phase line 38. The outlet of the second refrigerant gas-liquid two-phase line 38 is connected to the low-temperature refrigerant inlet of the condenser-evaporator 2.

[0083] The heating outlet of condenser 1 is connected to the inlet of high-temperature steam pipeline 41, the outlet of high-temperature steam pipeline 41 is connected to the high-temperature steam inlet of steam-water heat exchanger 12, the high-temperature condensate outlet of steam-water heat exchanger 12 is connected to the inlet of high-temperature condensate pipeline 42, and the outlet of high-temperature condensate pipeline 42 is connected to the heating inlet of condenser 1.

[0084] The heat outlet of the steam-water heat exchanger 12 is connected to the inlet of the first heating pipeline 51. A first circulating pump 21 is installed on the first heating pipeline 51. The outlet of the first heating pipeline 51 is connected to the inlet of the seventh heating pipeline 57 and the inlet of the second heating pipeline 52. A first regulating valve 23 is installed on the seventh heating pipeline 57. The outlet of the seventh heating pipeline 57 is connected to the hot water inlet of the distillation process heat exchanger 13. The hot water outlet of the distillation process heat exchanger 13 is connected to the inlet of the eighth heating pipeline 58. The outlet of the second heating pipeline 52 is connected to the inlet of the ninth heating pipeline 59 and the inlet of the third heating pipeline 53. A second regulating valve 24 is installed on the ninth heating pipeline 59. The outlet of the ninth heating pipeline 59 is connected to the concentrated... The hot water inlet of the process heat exchanger 14 is connected to the hot water outlet of the concentration process heat exchanger 14, which is connected to the inlet of the tenth heating pipeline 60. A third regulating valve 25 is installed on the third heating pipeline 53. The outlet of the third heating pipeline 53 is connected to the hot water inlet of the extraction process heat exchanger 15. The hot water outlet of the extraction process heat exchanger 15 is connected to the inlet of the fourth heating pipeline 54. The outlet of the fourth heating pipeline 54 and the outlet of the tenth heating pipeline 60 merge and connect to the inlet of the fifth heating pipeline 55. The outlet of the fifth heating pipeline 55 and the outlet of the eighth heating pipeline 58 merge and connect to the inlet of the sixth heating pipeline 56. The outlet of the sixth heating pipeline 56 is connected to the heating inlet of the steam-water heat exchanger 12.

[0085] The cooling outlet of the distillation process heat exchanger 13 is connected to the inlet of the first cooling water pipeline 61. The outlet of the first cooling water pipeline 61 is connected to the cooling inlet of the concentration process heat exchanger 14. The cooling outlet of the concentration process heat exchanger 14 is connected to the inlet of the second cooling water pipeline 62. The outlet of the second cooling water pipeline 62 is connected to the cooling inlet of the extraction process heat exchanger 15. The cooling outlet of the extraction process heat exchanger 15 is connected to the inlet of the third cooling water pipeline 63. The outlet of the third cooling water pipeline 63 is connected to the inlet of the fourth cooling water pipeline 64 and the inlet of the sixth preheating water pipeline 85. The fourth cooling water pipeline 64 is equipped with a fourth regulating valve 26. The outlet of the fourth cooling water pipeline 64 is connected to the inlet of the air-cooled radiator 10. The outlet of the air-cooled radiator 10 is connected to the inlet of the fifth cooling water pipeline 65.

[0086] A sixth regulating valve 28 is installed on the sixth preheating hot water pipeline 85. The outlet end of the sixth preheating hot water pipeline 85 is connected to the hot water inlet end of the third preheater 16. The hot water outlet end of the third preheater 16 is connected to the inlet end of the fifth preheating hot water pipeline 70. The outlet end of the fifth preheating hot water pipeline 70 is connected to the hot water inlet end of the second preheater 5. The hot water outlet end of the second preheater 5 is connected to the inlet end of the fourth preheating hot water pipeline 69. The outlet end of the fourth preheating hot water pipeline 69 is connected to the hot water inlet end of the evaporator 3. The hot water outlet end of the evaporator 3 is connected to the inlet end of the sixth cooling water pipeline 71. The outlet end of the sixth cooling water pipeline 71 and the outlet end of the fifth cooling water pipeline 65 merge and are connected to the inlet end of the seventh cooling water pipeline 72. A second circulating pump 22 is installed on the seventh cooling water pipeline 72. The outlet end of the seventh cooling water pipeline 72 is connected to the cooling inlet end of the distillation process heat exchange equipment 13.

[0087] The operating principle of this implementation plan is as follows:

[0088] The gaseous refrigerant exiting evaporator 3 enters the first compressor 6, where it is compressed and its temperature and pressure increase. It then enters the condenser-evaporator 2 to release latent heat, heating the low-temperature refrigerant pipeline. The liquid refrigerant exiting the condenser-evaporator 2 enters the second preheater 5 to continue releasing heat, becoming subcooled before entering the second expansion valve 9 for throttling and pressure reduction. It then enters the evaporator 3 to continue absorbing heat and vaporizing, completing the cycle. The gaseous refrigerant, after absorbing heat in the condenser-evaporator 2, enters the second compressor 7, where it is compressed and its temperature and pressure increase. It then enters the condenser 1 to release latent heat, subsequently entering the third preheater 16 to continue releasing heat. Becoming subcooled, it enters the first expansion valve 8 for throttling and pressure reduction, returning to the condenser-evaporator 2 to continue absorbing heat and vaporizing, completing the cycle.

[0089] The 90℃ high-temperature heat source water is vaporized by the condenser 1 to form 110℃ high-temperature steam, which then enters the steam-water heat exchanger 12 to exchange heat with the hot water supply pipeline. After absorbing heat and raising its temperature, the hot water is divided into three streams at 90℃ and enters the distillation process heat exchanger 13, the concentration process heat exchanger 14, and the extraction process heat exchanger 15 to meet the heat demand of the three processes. The supply and return water temperatures for the three processes are 80℃ / 85℃, 75℃ / 80℃, and 55℃ / 60℃, respectively. After the return water is mixed, it flows back to the steam-water heat exchanger 12 to continue absorbing heat, thus realizing the heat supply cycle.

[0090] The three types of process-end connection cooling water circulation pipelines are used to couple the process cycle with the refrigerant cycle. The cooling water pipelines flow sequentially through the distillation process heat exchanger 13, the concentration process heat exchanger 14, and the extraction process heat exchanger 15 to achieve a stepped temperature increase. Excess waste heat is dissipated by entering the air-cooled radiator 10 through one stream of cooling water. The other stream of cooling water flows sequentially through the third preheater 16 and the second preheater 5 for preheating. The liquid refrigerant from the condenser 1 and the condenser-evaporator 2 is subcooled to a certain extent and then enters the evaporator 3 to heat the refrigerant. The cooling water from the evaporator 3 and the air-cooled radiator 10 mix and continue to enter the end of the process equipment to absorb heat and complete the cooling cycle.

[0091] Overall, this invention achieves two effects: First, it directly provides high-temperature hot water to the process side. Second, by setting different return water temperatures, it can meet the temperature range requirements of different processes. Third, the cooling water flows through the three types of process terminals in sequence to achieve a gradual increase in temperature, which improves the problems of poor heat exchange effect and unstable operation caused by large temperature differences in cooling water. Fourth, the refrigerant side is combined with the cooling water circulation to realize the internal thermal energy circulation of the system, thereby improving the system's energy utilization rate and overall thermal efficiency.

[0092] In summary, this invention adds a steam-water heat exchanger to the condenser side, avoiding the cumbersome process of separately setting up de-cooling and de-pressure adjustment devices required for steam heating, thus improving the system's versatility and adaptability. This invention directly uses multi-stage recovery of process waste heat for refrigerant heating in both low-temperature and high-temperature zones, reducing cooling water temperature drop and heat loss, significantly lowering the need for external heat replenishment, and achieving dual optimization of energy saving, consumption reduction, and operating costs. It is suitable for multi-temperature zone process heating and energy-saving retrofitting scenarios.

[0093] Specific Implementation Plan Five: Combining Figure 5 As shown, unlike the fourth specific implementation scheme, the air-cooled radiator 10 is replaced with a water-cooled heat exchanger 11, and it also includes a first low-temperature water cooling pipe 81 and a second low-temperature water cooling pipe 82. The outlet end of the first low-temperature water cooling pipe 81 is connected to the cooling inlet end of the water-cooled heat exchanger 11, and the cooling outlet end of the water-cooled heat exchanger 11 is connected to the inlet end of the second low-temperature water cooling pipe 82.

[0094] The difference between this implementation plan and specific implementation plan four is that by replacing the air-cooled cooling method with a water-cooled cooling method on the cooling side, it has both higher heat exchange efficiency and stable heat exchange performance. It can achieve the same heat dissipation with lower cooling medium flow rate and smaller temperature difference, and can be directly connected to the existing cooling water network, improving the system layout flexibility and operational adaptability.

[0095] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. An endogenous coupled circulation all-electric process system with a preheater, characterized in that: It includes a condenser (1), a condenser-evaporator (2), an evaporator (3), a first preheater (4), a first compressor (6), a second compressor (7), a first expansion valve (8), a second expansion valve (9), an air-cooled radiator (10), a distillation process heat exchanger (13), a concentration process heat exchanger (14), an extraction process heat exchanger (15), a first circulating pump (21), a second circulating pump (22), a first regulating valve (23), a second regulating valve (24), a third regulating valve (25), a fourth regulating valve (26), and a fifth regulating valve (27). The refrigerant outlet of the evaporator (3) is connected to the inlet of the first compressor (6), the outlet of the first compressor (6) is connected to the high-temperature refrigerant inlet of the condenser-evaporator (2), the high-temperature refrigerant outlet of the condenser-evaporator (2) is connected to the inlet of the second expansion valve (9), and the outlet of the second expansion valve (9) is connected to the refrigerant inlet of the evaporator (3). The refrigerant outlet of the condenser-evaporator (2) on the low-temperature side 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 connected to the refrigerant inlet of the first preheater (4), the refrigerant outlet of the first preheater (4) is connected to the inlet of the first expansion valve (8), and the outlet of the first expansion valve (8) is connected to the refrigerant inlet of the condenser-evaporator (2) on the low-temperature side. The heat supply outlet of the condenser (1) is connected to the hot water inlet of the distillation heat exchanger (13), the hot water inlet of the concentration heat exchanger (14), and the hot water inlet of the extraction heat exchanger (15), respectively. A first circulation pump (21) is installed on the pipeline connected to the heat supply outlet of the condenser (1), and a first regulating valve (23), a second regulating valve (24), and a third regulating valve (25) are respectively installed on the pipelines connected to the hot water inlet of the distillation heat exchanger (13), the concentration heat exchanger (14), and the extraction heat exchanger (15). After flowing through the extraction heat exchanger (15), the pipeline merges with the pipeline flowing through the concentration heat exchanger (14), and the merged pipeline merges with the pipeline flowing through the distillation heat exchanger (13) and then connects to the heat supply inlet of the condenser (1). The cooling outlet of the distillation process heat exchanger (13) is connected to the cooling inlet of the concentration process heat exchanger (14). The cooling outlet of the concentration process heat exchanger (14) is connected to the cooling inlet of the extraction process heat exchanger (15). The cooling outlet of the extraction process heat exchanger (15) is connected to the inlet of the air-cooled radiator (10) and the hot water inlet of the first preheater (4), respectively. The cooling outlet of the extraction process heat exchanger (15) is connected to the inlet of the air-cooled radiator (10). A fourth regulating valve (26) is provided on the pipeline. A fifth regulating valve (27) is provided on the pipeline connecting the cooling outlet end of the extraction process heat exchange equipment (15) to the hot water inlet end of the first preheater (4). The hot water outlet end of the first preheater (4) is connected to the hot water inlet end of the evaporator (3). The hot water outlet end of the evaporator (3) and the outlet end of the air-cooled radiator (10) are connected to the cooling inlet end of the distillation process heat exchange equipment (13). A second circulating pump (22) is provided on the pipeline after the connection.

2. An endogenous coupled circulation all-electric process system with a preheater, characterized in that: It includes a condenser (1), a condenser-evaporator (2), an evaporator (3), a second preheater (5), a first compressor (6), a second compressor (7), a first expansion valve (8), a second expansion valve (9), an air-cooled radiator (10), a distillation process heat exchanger (13), a concentration process heat exchanger (14), an extraction process heat exchanger (15), a first circulating pump (21), a second circulating pump (22), a first regulating valve (23), a second regulating valve (24), a third regulating valve (25), a fourth regulating valve (26), and a fifth regulating valve (27). The refrigerant outlet of the evaporator (3) is connected to the inlet of the first compressor (6), the outlet of the first compressor (6) is connected to the high-temperature refrigerant inlet of the condenser-evaporator (2), the high-temperature refrigerant outlet of the condenser-evaporator (2) is connected to the refrigerant inlet of the second preheater (5), the refrigerant outlet of the second preheater (5) is connected to the inlet of the second expansion valve (9), and the outlet of the second expansion valve (9) is connected to the refrigerant inlet of the evaporator (3). The refrigerant outlet of the condenser (2) on the low-temperature side 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 connected to the inlet of the first expansion valve (8), and the outlet of the first expansion valve (8) is connected to the refrigerant inlet of the condenser (2) on the low-temperature side. The heat supply outlet of the condenser (1) is connected to the hot water inlet of the distillation heat exchanger (13), the hot water inlet of the concentration heat exchanger (14), and the hot water inlet of the extraction heat exchanger (15), respectively. A first circulation pump (21) is installed on the pipeline connected to the heat supply outlet of the condenser (1), and a first regulating valve (23), a second regulating valve (24), and a third regulating valve (25) are respectively installed on the pipelines connected to the hot water inlet of the distillation heat exchanger (13), the concentration heat exchanger (14), and the extraction heat exchanger (15). The pipeline flowing through the extraction heat exchanger (15) merges with the pipeline flowing through the concentration heat exchanger (14), and the merged pipeline merges with the pipeline flowing through the distillation heat exchanger (13) and then connects to the heat supply inlet of the condenser (1). The cooling outlet of the distillation process heat exchanger (13) is connected to the cooling inlet of the concentration process heat exchanger (14). The cooling outlet of the concentration process heat exchanger (14) is connected to the cooling inlet of the extraction process heat exchanger (15). The cooling outlet of the extraction process heat exchanger (15) is connected to the inlet of the air-cooled radiator (10) and the hot water inlet of the second preheater (5). The cooling outlet of the extraction process heat exchanger (15) is connected to the inlet of the air-cooled radiator (10). A fourth regulating valve (26) is provided on the pipeline. A fifth regulating valve (27) is provided on the pipeline connecting the cooling outlet end of the extraction process heat exchange equipment (15) and the hot water inlet end of the second preheater (5). The hot water outlet end of the second preheater (5) is connected to the hot water inlet end of the evaporator (3). The hot water outlet end of the evaporator (3) and the outlet end of the air-cooled radiator (10) are connected to the cooling inlet end of the distillation process heat exchange equipment (13). A second circulating pump (22) is provided on the pipeline after the connection.

3. The all-electric process system with preheater and internal coupling circulation as described in claim 2, characterized in that: It also includes a third preheater (16) and a sixth regulating valve (28). The refrigerant outlet of the condenser (1) is connected to the inlet of the third preheater (16), and the refrigerant outlet of the third preheater (16) is connected to the inlet of the first expansion valve (8). A sixth regulating valve (28) is provided on the pipeline connecting the outlet end of the heat exchange equipment (15) of the extraction process to the inlet end of the third preheater (16). The hot water outlet end of the third preheater (16) is connected to the hot water inlet end of the second preheater (5).

4. An endogenous coupled circulation all-electric process system with a preheater, characterized in that: It includes a condenser (1), a condenser-evaporator (2), an evaporator (3), a second preheater (5), a first compressor (6), a second compressor (7), a first expansion valve (8), a second expansion valve (9), an air-cooled radiator (10), a steam-water heat exchanger (12), a distillation process heat exchanger (13), a concentration process heat exchanger (14), an extraction process heat exchanger (15), a third preheater (16), a first circulating pump (21), a second circulating pump (22), a first regulating valve (23), a second regulating valve (24), a third regulating valve (25), a fourth regulating valve (26), and a sixth regulating valve (28). The refrigerant outlet of the evaporator (3) is connected to the inlet of the first compressor (6), the outlet of the first compressor (6) is connected to the high-temperature refrigerant inlet of the condenser-evaporator (2), the high-temperature refrigerant outlet of the condenser-evaporator (2) is connected to the refrigerant inlet of the second preheater (5), the refrigerant outlet of the second preheater (5) is connected to the inlet of the second expansion valve (9), and the outlet of the second expansion valve (9) is connected to the refrigerant inlet of the evaporator (3). The refrigerant outlet of the condenser-evaporator (2) on the low-temperature side 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 connected to the refrigerant inlet of the third preheater (16), the refrigerant outlet of the third preheater (16) is connected to the inlet of the first expansion valve (8), and the outlet of the first expansion valve (8) is connected to the refrigerant inlet of the condenser-evaporator (2) on the low-temperature side. The heat supply outlet of the condenser (1) is connected to the high-temperature steam inlet of the steam-water heat exchanger (12), and the high-temperature condensate outlet of the steam-water heat exchanger (12) is connected to the heat supply inlet of the condenser (1). The heat supply outlet of the steam-water heat exchanger (12) is connected to the hot water inlet of the distillation process heat exchanger (13), the hot water inlet of the concentration process heat exchanger (14), and the hot water inlet of the extraction process heat exchanger (15), respectively. A first circulation pump (21) is installed on the pipeline connected to the heat supply outlet of the steam-water heat exchanger (12), and a first regulating valve (23), a second regulating valve (24), and a third regulating valve (25) are respectively installed on the pipelines corresponding to the hot water inlet of the distillation process heat exchanger (13), the concentration process heat exchanger (14), and the extraction process heat exchanger (15). The pipeline flowing through the extraction process heat exchanger (15) merges with the pipeline flowing through the concentration process heat exchanger (14), and the merged pipeline merges with the pipeline flowing through the distillation process heat exchanger (13) and then connects to the heat supply inlet of the steam-water heat exchanger (12). The cooling outlet of the distillation heat exchanger (13) is connected to the cooling inlet of the concentration heat exchanger (14). The cooling outlet of the concentration heat exchanger (14) is connected to the cooling inlet of the extraction heat exchanger (15). The cooling outlet of the extraction heat exchanger (15) is connected to the inlet of the air-cooled radiator (10) and the hot water inlet of the third preheater (16), respectively. A fourth regulating valve (26) is provided on the pipeline connecting the cooling outlet of the extraction heat exchanger (15) to the inlet of the air-cooled radiator (10). A sixth regulating valve (28) is provided on the pipeline connecting the cooling outlet end of the process heat exchange equipment (15) and the hot water inlet end of the third preheater (16). The hot water outlet end of the third preheater (16) is connected to the hot water inlet end of the second preheater (5). The hot water outlet end of the second preheater (5) is connected to the hot water inlet end of the evaporator (3). The hot water outlet end of the evaporator (3) and the outlet end of the air-cooled radiator (10) are connected to the cooling inlet end of the distillation process heat exchange equipment (13). A second circulating pump (22) is provided on the pipeline after the connection.

5. An endogenous coupled circulation all-electric process system with a preheater, characterized in that: It includes a condenser (1), a condenser-evaporator (2), an evaporator (3), a second preheater (5), a first compressor (6), a second compressor (7), a first expansion valve (8), a second expansion valve (9), a water-cooled heat exchanger (11), a steam-water heat exchanger (12), a distillation process heat exchanger (13), a concentration process heat exchanger (14), an extraction process heat exchanger (15), a third preheater (16), a first circulating pump (21), a second circulating pump (22), a first regulating valve (23), a second regulating valve (24), a third regulating valve (25), a fourth regulating valve (26), and a sixth regulating valve (28). The refrigerant outlet of the evaporator (3) is connected to the inlet of the first compressor (6), the outlet of the first compressor (6) is connected to the high-temperature refrigerant inlet of the condenser-evaporator (2), the high-temperature refrigerant outlet of the condenser-evaporator (2) is connected to the refrigerant inlet of the second preheater (5), the refrigerant outlet of the second preheater (5) is connected to the inlet of the second expansion valve (9), and the outlet of the second expansion valve (9) is connected to the refrigerant inlet of the evaporator (3). The refrigerant outlet of the condenser-evaporator (2) on the low-temperature side 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 connected to the refrigerant inlet of the third preheater (16), the refrigerant outlet of the third preheater (16) is connected to the inlet of the first expansion valve (8), and the outlet of the first expansion valve (8) is connected to the refrigerant inlet of the condenser-evaporator (2) on the low-temperature side. The heat supply outlet of the condenser (1) is connected to the high-temperature steam inlet of the steam-water heat exchanger (12), and the high-temperature condensate outlet of the steam-water heat exchanger (12) is connected to the heat supply inlet of the condenser (1). The heat supply outlet of the steam-water heat exchanger (12) is connected to the hot water inlet of the distillation process heat exchanger (13), the hot water inlet of the concentration process heat exchanger (14), and the hot water inlet of the extraction process heat exchanger (15), respectively. A first circulation pump (21) is installed on the pipeline connected to the heat supply outlet of the steam-water heat exchanger (12), and a first regulating valve (23), a second regulating valve (24), and a third regulating valve (25) are respectively installed on the pipelines corresponding to the hot water inlet of the distillation process heat exchanger (13), the concentration process heat exchanger (14), and the extraction process heat exchanger (15). The pipeline flowing through the extraction process heat exchanger (15) merges with the pipeline flowing through the concentration process heat exchanger (14), and the merged pipeline merges with the pipeline flowing through the distillation process heat exchanger (13) and then connects to the heat supply inlet of the steam-water heat exchanger (12). The cooling outlet of the distillation process heat exchanger (13) is connected to the cooling inlet of the concentration process heat exchanger (14). The cooling outlet of the concentration process heat exchanger (14) is connected to the cooling inlet of the extraction process heat exchanger (15). The cooling outlet of the extraction process heat exchanger (15) is connected to the inlet of the water-cooled heat exchanger (11) and the hot water inlet of the third preheater (16), respectively. A fourth regulating valve (26) is provided on the pipeline connecting the cooling outlet of the extraction process heat exchanger (15) to the inlet of the water-cooled heat exchanger (11). A sixth regulating valve (28) is provided on the pipeline connecting the cooling outlet end of the process heat exchanger (15) and the hot water inlet end of the third preheater (16). The hot water outlet end of the third preheater (16) is connected to the hot water inlet end of the second preheater (5). The hot water outlet end of the second preheater (5) is connected to the hot water inlet end of the evaporator (3). The hot water outlet end of the evaporator (3) merges with the outlet end of the water-cooled heat exchanger (11) and then connects to the cooling inlet end of the distillation process heat exchanger (13). A second circulating pump (22) is provided on the pipeline after the merger. The water-cooled heat exchanger (11) is equipped with a low-temperature water cooling inlet pipe and a low-temperature water cooling outlet pipe.

Images