Solar double-effect evaporation injection and mechanical two-stage compression heat pump steam system and its working method

Abstract

The present application discloses a solar double-effect evaporation injection and mechanical two-stage compression heat pump steam system, which includes a solar double-effect evaporation system, a heat compression system and a mechanical compression system. In the heat pump steam system described herein, solar energy is collected by a solar collector to heat the water working medium to obtain high-temperature hot water, which is then flash-evaporated in a high-temperature evaporation tank to produce high-temperature and high-pressure water vapor and high-temperature saturated water, thereby utilizing the solar energy for the first time. The high-temperature saturated water obtained after flash evaporation is further heat-exchanged with the water in the low-temperature evaporation tank to produce low-temperature and low-pressure water vapor and low-temperature saturated water, which is heated by a water supply heater to replenish water and then recycled back to the solar collector. The heat pump steam system described herein can efficiently utilize solar energy, provide cleaner and more environmentally friendly steam, and significantly reduce the electrical energy and other energy consumed by the heat pump steam system.

Description

Technical Field

[0001] The invention relates to the technical field of clean energy and heat pumps, and in particular to a solar double-effect evaporation injection and mechanical two-stage compression heat pump steam system and a working method thereof. Background Art

[0002] Solar energy is an inexhaustible clean energy. In the energy and environmental context of "carbon peak and carbon neutrality", improving the efficiency of solar energy utilization can effectively reduce the consumption of primary energy, which is of great significance for reducing carbon emissions. Therefore, effective recovery and utilization of solar energy is urgent. At present, solar energy can usually be utilized through photovoltaic power generation, but its thermoelectric conversion efficiency is low, and the equipment cost is high, and the one-time investment is too large. Solar energy can also be collected through solar collectors and other methods for heating water or other working fluids, but it is basically limited to the field of household heating, and the heat exchange temperature difference is small, and the overall utilization rate of solar energy is still low.

[0003] At the same time, heat pump technology is an emerging energy-saving technology, among which high-temperature heat pumps have received widespread attention. It has been gradually applied to the industrial field to provide high-temperature and high-pressure steam for industrial use, but it still needs to rely on some electricity to provide heat. At present, it still mainly relies on burning coal to provide electricity, which indirectly increases carbon emissions. Therefore, in the field of industrial heating, it is necessary to expand the heat source available to the heat pump system and further reduce the consumption of electricity.

[0004] To this end, those skilled in the art need to develop a heat pump steam generation system that can deeply utilize solar energy. Summary of the invention

[0005] The purpose of the present application is to provide a solar double-effect evaporation injection and mechanical two-stage compression heat pump steam system that can deeply utilize solar energy, thereby solving the above-mentioned prior art problems. Specifically, in the heat pump steam system described in this article, solar energy is collected by a solar collector, and the water working medium is heated to obtain high-temperature hot water, and the high-temperature hot water is then flashed in a high-temperature evaporation tank to produce high-temperature and high-pressure water vapor and high-temperature saturated water, thereby making the first use of solar energy. The high-temperature saturated water obtained after flash evaporation is further heat-exchanged with the water in the low-temperature evaporation tank to produce low-temperature and low-pressure water vapor and low-temperature saturated water. The low-temperature saturated water is heated by a water supply heater to replenish water, and then recycled back to the solar collector to form a complete cycle, and the absorbed solar energy is utilized twice through flash evaporation and heat exchange, thereby achieving the purpose of deeply utilizing solar energy.

[0006] To achieve the above objectives, this application provides the following technical solutions.

[0007] In a first aspect, the present application provides a solar double-effect evaporation and injection and mechanical two-stage compression heat pump steam system, characterized in that the solar double-effect evaporation and injection and mechanical two-stage compression heat pump steam system comprises a solar double-effect evaporation system, a heat compression system and a mechanical compression system;

[0008] The solar double-effect evaporation system comprises a solar collector, a high-temperature evaporation tank, a solar circulation pump, a low-temperature evaporation tank, a water supply heating pipe and a water supply heater, wherein the low-temperature evaporation tank is provided with a low-temperature evaporation spiral pipe, the solar collector, the high-temperature evaporation tank, the solar circulation pump, the high-temperature evaporation spiral pipe and the water supply heater are sequentially connected to form a fluid flow loop, the water supply heating pipe is fluidically connected to the water supply heater, and the water supply heater is fluidically connected to at least one of the high-temperature evaporation tank and the low-temperature evaporation tank;

[0009] Preferably, the solar double-effect evaporation system further comprises a water supply pipe and a water supply bypass pipe, the water supply heating pipe, the water supply heater, the water supply pipe and the low-temperature evaporation tank form a fluid flow passage, the water supply heating pipe, the water supply heater, the water supply bypass pipe and the high-temperature evaporation tank form a fluid flow passage, the first end of the water supply bypass pipe is in fluid communication with the high-temperature evaporation tank, and the second end of the water supply bypass pipe is in fluid communication with the water supply pipe;

[0010] Wherein, the thermal compression system comprises a high-temperature evaporation tank, a low-temperature evaporation tank, an ejector pump and an air storage and cooling water tank, the high-temperature evaporation tank is in fluid communication with the air inlet end of the ejector pump, and is used to provide high-pressure water vapor to the ejector pump, the low-temperature evaporation tank is in fluid communication with the air inlet end of the ejector pump, and is used to provide low-pressure water vapor to the ejector pump, and the exhaust end of the ejector pump is in fluid communication with the air storage and cooling water tank;

[0011] The mechanical compression system includes a high-temperature evaporator, a compressor water supply pump, a water vapor compressor and an air storage and cooling water tank. The air storage and cooling water tank is used to provide water vapor to the water vapor compressor. The high-temperature evaporator, the compressor water supply pump and the water vapor compressor form a fluid flow path for replenishing water to the water vapor compressor.

[0012] In an implementation manner of the first aspect, the thermal compression system further includes a water tank circulation pump, and the low-temperature evaporation tank, the water tank circulation pump and the gas storage and cooling water tank form a fluid flow loop.

[0013] In one implementation of the first aspect, the high temperature evaporation tank includes a high temperature evaporation tank drain pipe, and the low temperature evaporation tank includes a low temperature evaporation tank drain pipe.

[0014] In one embodiment of the first aspect, in the solar double-effect evaporation system, the solar collector is in fluid communication with the high-temperature evaporation tank through a solar water outlet pipe, and a flash valve is provided on the solar water outlet pipe, the high-temperature evaporation tank is in fluid communication with a solar circulation pump through a solar connecting pipe, the solar circulation pump is in fluid communication with a first end of a low-temperature evaporation spiral tube, the second end of the low-temperature evaporation spiral tube is in fluid communication with a make-up water heater through a solar water return pipe, and the make-up water heater is in fluid communication with the solar collector through a solar water inlet pipe;

[0015] The water replenishment heating pipe is used to replenish water to the water replenishment heater, the water replenishment heater is in fluid communication with the low-temperature evaporator through the water replenishment pipe, and a fourth stop valve is provided on the water replenishment pipe. Meanwhile, the water replenishment heater is in fluid communication with the high-temperature evaporator through a water replenishment bypass pipe, an intersection of the water replenishment bypass pipe and the water replenishment pipe is between the water replenishment heater and the fourth stop valve, and a third stop valve is provided on the water replenishment bypass pipe.

[0016] In one embodiment of the first aspect, in the thermal compression system, the high-temperature evaporation tank is in fluid communication with the inlet end of the ejector pump through a power inlet pipe, the low-temperature evaporation tank is in fluid communication with the inlet end of the ejector pump through an ejector inlet pipe, and the outlet end of the ejector pump is in fluid communication with the gas storage and cooling water tank through an ejector pump exhaust pipe;

[0017] The low-temperature evaporator is fluidically connected to the water tank circulation pump, the water tank circulation pump is fluidically connected to the gas storage and cooling water tank through a water tank circulation pipe, and a second regulating valve is provided on the water tank circulation pipe, the gas storage and cooling water tank is fluidically connected to the low-temperature evaporator through a water tank return pipe, and a first regulating valve is provided on the water tank return pipe.

[0018] In one implementation of the first aspect, the ejector pump is in fluid communication with the gas storage and cooling water tank through an ejector pump exhaust pipe, and the gas outlet is arranged below the liquid level of the gas storage and cooling water tank.

[0019] In one embodiment of the first aspect, in the mechanical compression system, the high-temperature evaporator, the compressor water supply pump and the water vapor compressor are fluidically connected through a compressor water supply pipe, and a third regulating valve is provided on the compressor water supply pipe;

[0020] The gas storage and cooling water tank is fluidly connected to the water vapor compressor through the compressor suction pipe, and the water vapor compressor transmits compressed water vapor to the outside through the compressor exhaust pipe.

[0021] In a second aspect, the present application provides a working method of the solar double-effect evaporation injection and mechanical two-stage compression heat pump steam system as described in the first aspect, the method comprising the following steps:

[0022] First, the solar double-effect evaporation system starts working. The solar collector collects solar energy and heats the water working medium to obtain high-temperature hot water. The high-temperature hot water then flashes in the high-temperature evaporation tank to produce high-temperature and high-pressure water vapor and high-temperature saturated water. The high-temperature saturated water exchanges heat with the water in the low-temperature evaporation tank to produce low-temperature and low-pressure water vapor and low-temperature saturated water. The high-temperature saturated water releases heat and the temperature drops to form low-temperature hot water. The low-temperature hot water heats the supplementary water through the supplementary water heater and then circulates back to the solar collector. The solar energy absorbed by the solar collector heats the high-temperature hot water.

[0023] Secondly, the thermal compression system starts to work, and the high-temperature and high-pressure water vapor generated in the high-temperature evaporation tank is ejected by the ejector pump to eject the low-temperature and low-pressure water vapor in the low-temperature evaporation tank, obtaining medium-pressure water vapor, which then enters the gas storage and cooling water tank;

[0024] Finally, the medium-pressure water vapor is compressed by the water vapor compressor to form water vapor with higher temperature and pressure. At the same time, the high-temperature saturated water in the high-temperature evaporation tank is replenished to the water vapor compressor through the compressor water replenishment pump.

[0025] In one embodiment of the second aspect, the temperature of the high-temperature hot water is 110°C; the temperature of the high-temperature and high-pressure steam is 100°C, and the pressure is 1 bar; the temperature of the low-temperature and low-pressure steam is 85°C, and the pressure is 0.579 bar.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. By using the solar double-effect evaporation system, it is realized that the water working medium is heated by solar energy to produce high-temperature hot water, and high-temperature and high-pressure water vapor is generated by flash evaporation in the high-temperature evaporation tank 10, and low-temperature and low-pressure water vapor is generated by heat exchange in the low-temperature evaporation tank 13, so that the secondary utilization of solar energy is realized, and the heat in the high-temperature hot water can be more fully utilized to improve the utilization rate of solar energy. Moreover, solar energy, as a clean and renewable energy, can effectively reduce the consumption of primary energy such as fossil fuels, thereby helping to save energy and reduce emissions and promote the early realization of carbon neutrality;

[0028] 2. By using an ejector pump to utilize the high-temperature and high-pressure water vapor generated by the solar double-effect evaporation system to thermally compress the water vapor at a lower temperature and pressure to generate medium-pressure water vapor, the pressure of the water vapor at a lower temperature and pressure can be increased, which is beneficial to increasing the suction pressure of the water vapor compressor 61, thereby improving the energy efficiency of the entire system and reducing the power consumption of the system;

[0029] 3. Through the 61 water vapor compressor, the medium-pressure water vapor is further compressed and increased in pressure and temperature to produce water vapor with higher temperature and pressure to meet the needs of users. Mechanical compression has high efficiency and strong stability, and can effectively increase the water vapor pressure and temperature to ensure efficient and stable operation of the system;

[0030] 4. Through the combination of solar double-effect evaporation system, thermal compression and mechanical compression, high-temperature and high-pressure water vapor that meets user needs is realized from solar energy, making full use of clean and renewable solar energy resources. Compared with the existing coal-fired and gas-fired boilers, this system only uses electricity to provide water vapor, which is cleaner and more environmentally friendly. Compared with electric boilers, this system uses solar energy, and the power and energy consumption are greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A solar double-effect evaporation injection and mechanical two-stage compression heat pump steam system according to an embodiment of the present application is shown.

[0032] The reference numerals and names in the figures are as follows:

[0033] 10 high temperature evaporator, 11 solar connecting pipe, 12 solar circulation pump, 13 low temperature evaporator, 14 low temperature evaporation spiral tube, 15 solar return pipe, 16 low temperature evaporator drain pipe, 17 first stop valve, 18 make-up water heater, 19 second stop valve, 20 high temperature evaporator drain pipe, 21 solar water inlet pipe, 22 solar collector, 23 flash valve, 24 solar water outlet pipe, 25 make-up water heating pipe, 26 make-up water pipe, 27 third stop valve, 28 make-up water bypass pipe, 29 fourth stop valve, 50 power intake pipe, 51 ejector pump, 52 ejector intake pipe, 53 ejector pump exhaust pipe, 54 gas storage and cooling water tank, 55 first regulating valve, 56 water tank return pipe, 57 water tank circulation pump, 58 water tank circulation pipe, 59 second regulating valve, 60 compressor suction pipe, 61 water vapor compressor, 62 compressor exhaust pipe, 63 third regulating valve, 64 compressor make-up water pipe, 65 compressor make-up water pump. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] See also Figure 1The present application provides a solar double-effect evaporation injection and mechanical two-stage compression heat pump steam system, which mainly includes a solar double-effect evaporation system, a heat compression system and a mechanical compression system. In one embodiment, the solar double-effect evaporation system and the heat compression system are connected through a high-temperature evaporation tank 10 and a low-temperature evaporation tank 13. There is a low-temperature evaporation spiral tube 14 in the low-temperature evaporation tank 13, and the internal space of the low-temperature evaporation spiral tube 14 and the low-temperature evaporation tank 13 are sealed with each other. In other words, the fluid in the low-temperature evaporation spiral tube 14 and the fluid in the low-temperature evaporation tank 13 are separated from each other and will not mix with each other. The heat compression system and the mechanical compression system are connected to the gas storage and cooling water tank 54 through the high-temperature evaporation tank 10, and the solar double-effect evaporation system and the mechanical compression system are connected through the high-temperature evaporation tank 10.

[0036] In a specific embodiment, the solar double-effect evaporation system may include a high-temperature evaporation tank 10, a solar connecting pipe 11, a solar circulation pump 12, a low-temperature evaporation tank 13, a low-temperature evaporation spiral tube 14, a solar return pipe 15, a low-temperature evaporation tank drain pipe 16, a first stop valve 17, a make-up water heater 18, a second stop valve 19, a high-temperature evaporation tank drain pipe 20, a solar water inlet pipe 21, a solar collector 22, a flash valve 23, a solar water outlet pipe 24, a make-up water heating pipe 25, a make-up water pipe 26, a third stop valve 27, a make-up water bypass pipe 28, and a fourth stop valve 29.

[0037] like Figure 1 As shown, the solar collector 22, the high temperature evaporation tank 10, the solar circulation pump 12, the low temperature evaporation spiral tube 14 in the low temperature evaporation tank 13, and the water supply heater 18 are sequentially connected to form a fluid flow loop. The water supply heating pipe 25, the water supply heater 18, the water supply bypass pipe 28 and the high temperature evaporation tank 10 form a fluid flow path, which is used to replenish water working medium to the high temperature evaporation tank. In addition, the water supply heating pipe 25, the water supply heater 18 and the low temperature evaporation tank 13 form a fluid flow path, which is used to replenish water working medium to the low temperature evaporation tank 13.

[0038] In a specific embodiment, the solar collector 22 is in fluid communication with the high temperature evaporation tank 10 through a solar water outlet pipe 24, and a flash valve 23 is provided on the solar water outlet pipe 24. The high temperature evaporation tank 10 is in fluid communication with the solar circulation pump 12 through a solar connecting pipe 11, and the solar circulation pump 12 is in fluid communication with the first end of the low temperature evaporation spiral pipe 14, and the second end of the low temperature evaporation spiral pipe 14 is in fluid communication with the water supply heater 18 through a solar water return pipe 15. The water supply heater 18 is in fluid communication with the solar collector 22 through a solar water inlet pipe 21. The water supply heating pipe 25 is used to supply water to the water supply heater 18, and the water supply heater 18 is in fluid communication with the low temperature evaporation tank 13 through a water supply pipe 26, and a fourth stop valve 29 is provided on the water supply pipe 26. At the same time, the water supply heater 18 is fluidically connected to the high-temperature evaporator 10 through a water supply bypass pipe 28 , the intersection of the water supply bypass pipe 28 and the water supply pipe 26 is between the water supply heater 18 and the fourth stop valve 29 , and a third stop valve 27 is provided on the water supply bypass pipe 28 .

[0039] In a specific embodiment, the thermal compression system may include a high temperature evaporation tank 10, a low temperature evaporation tank 13, a power air intake pipe 50, an ejector pump 51, an ejector air intake pipe 52, an ejector pump exhaust pipe 53, an air storage and cooling water tank 54, a first regulating valve 55, a water tank return pipe 56, a water tank circulation pump 57, a water tank circulation pipe 58, and a second regulating valve 59. In a specific embodiment, the high temperature evaporation tank 10 is in fluid communication with the air intake end of the ejector pump 51 through the power air intake pipe 50, the low temperature evaporation tank 13 is in fluid communication with the air intake end of the ejector pump 51 through the ejector air intake pipe 52, and the air outlet end of the ejector pump 51 is in fluid communication with the air storage and cooling water tank 54 through the ejector pump exhaust pipe 53. The low temperature evaporation tank 13 is in fluid communication with the water tank circulation pump 57, the water tank circulation pump 57 is in fluid communication with the air storage and cooling water tank 57 through the water tank circulation pipe 58, and a second regulating valve 59 is provided on the water tank circulation pipe 58. The gas storage and cooling water tank 57 is in fluid communication with the low-temperature evaporation tank 13 via a water tank return pipe 56, and a first regulating valve 55 is provided on the water tank return pipe 56. In a preferred embodiment, the ejector pump 51 is in fluid communication with the gas storage and cooling water tank 54 via an ejector pump exhaust pipe 53, and the gas outlet is provided below the liquid level of the gas storage and cooling water tank 54.

[0040] In a specific embodiment, the mechanical compression system includes a high-temperature evaporator 10, a compressor suction pipe 60, a water vapor compressor 61, a compressor exhaust pipe 62, a third regulating valve 63, a compressor water supply pipe 64, and a compressor water supply pump 65. In a specific embodiment, in the mechanical compression system, the high-temperature evaporator 10, the compressor water supply pump 65 and the water vapor compressor 61 are fluidically connected through the compressor water supply pipe 64, and the third regulating valve 63 is provided on the compressor water supply pipe 64. The gas storage and cooling water tank 54 is fluidically connected to the water vapor compressor 61 through the compressor suction pipe 60, and the water vapor compressor 61 transports compressed water vapor to the outside through the compressor exhaust pipe 62.

[0041] Next, the working method of the solar double-effect evaporation and mechanical two-stage compression heat pump steam system described in this article will be described.

[0042] During normal operation, the solar double-effect evaporation system works first, and the high-temperature water medium from the solar collector 22 flows through the flash valve 23 through the solar outlet pipe 24 and then flows into the high-temperature evaporation tank 10. After flowing through the flash valve 23 and flowing into the high-temperature evaporation tank 10, the high-temperature water medium flashes to produce high-temperature and high-pressure water vapor and high-temperature saturated water. The high-temperature saturated water is sent to the low-temperature evaporation spiral tube 14 in the low-temperature evaporation tank 13 by the solar circulating pump 12 through the solar connecting pipe 11, and heats the water medium in the low-temperature evaporation tank 13 in the low-temperature evaporation spiral tube 14 to make it absorb heat and evaporate to produce low-temperature and low-pressure water vapor. The temperature of the high-temperature water medium after heat release is reduced, and it flows into the water supply heater 18 through the solar return pipe 15, and releases heat again in the water supply heater 18 to heat the external supplementary water from the water supply heating pipe 25. Finally, the water medium flows back into the solar collector 22 through the solar inlet pipe 21, and is heated by the absorbed solar energy again in the solar collector 22 to produce high-temperature water medium, forming a complete cycle. The external supplementary water flows into the supplementary water heater 18 through the supplementary water heating pipe 25, and after being heated in the supplementary water heater 18, flows through the supplementary water pipe 26 through the fourth stop valve 29 and flows into the low-temperature evaporation tank 13, making up for the water working medium lost in the low-temperature evaporation tank 13 due to the generation of low-temperature and low-pressure water vapor. At the same time, a supplementary water bypass pipe 28 is connected between the supplementary water heater 18 and the fourth stop valve 29 on the supplementary water pipe 26. A third stop valve 27 is arranged on the supplementary water bypass pipe 28. The external supplementary water can also flow through the supplementary water bypass pipe 28 through the third stop valve 27 and flow into the high-temperature evaporation tank 10, making up for the water working medium lost in the high-temperature evaporation tank 10 due to the generation of high-temperature and high-pressure water vapor. Meanwhile, a high-temperature evaporation tank drain pipe 20 is connected to the high-temperature evaporation tank 10, and a second stop valve 19 is arranged on the high-temperature evaporation tank drain pipe 20. Waste water working medium and excess water working medium in the high-temperature evaporation tank 10 can flow through the high-temperature evaporation tank drain pipe 20 through the second stop valve 19 and flow out of the high-temperature evaporation tank 10. Meanwhile, a low-temperature evaporation tank drain pipe 16 is connected to the low-temperature evaporation tank 13, and a first stop valve 17 is arranged on the low-temperature evaporation tank drain pipe 16. Waste water working medium and excess water working medium in the low-temperature evaporation tank 13 can flow through the low-temperature evaporation tank 16 drain pipe through the first stop valve 17 and flow out of the low-temperature evaporation tank 13.

[0043] Then the thermal compression system works, and the high-temperature and high-pressure water vapor generated in the high-temperature evaporation tank 10 flows into the ejector pump 51 through the power intake pipe 50 to eject the water vapor with lower temperature and pressure generated in the low-temperature evaporation tank 13. The water vapor with lower temperature and pressure in the low-temperature evaporation tank 13 flows into the ejector pump 51 through the ejector intake pipe 52 and is thermally compressed by the high-temperature and high-pressure water vapor in the high-temperature evaporation tank 10. After compression, the two are mixed to form intermediate-pressure water vapor and may have a certain degree of superheat. The intermediate-pressure water vapor flows into the liquid level of the gas storage and cooling water tank 54 through the ejector pump exhaust pipe 53. The medium-temperature liquid water in the gas storage and cooling water tank 54 absorbs the superheat of the intermediate-pressure water vapor and evaporates to increase the amount of water vapor generated, and the superheat of the intermediate-pressure water vapor is reduced. The medium-temperature liquid water in the gas storage and cooling water tank 54 can flow through the water tank return pipe 56 through the first regulating valve 55 and flow back into the low-temperature evaporation tank 13, which can also make up for the consumption of the low-temperature water working medium in the low-temperature evaporation tank 13 due to evaporation. At the same time, the low-temperature water working medium in the low-temperature evaporation tank 13 can also flow through the water tank circulation pump 57 and the water tank circulation pipe 58 through the second regulating valve 59 and enter the gas storage and cooling water tank 54, making up for the loss of the water working medium in the gas storage and cooling water tank 54 due to absorbing the superheated evaporation of the intermediate pressure water vapor.

[0044] Finally, the mechanical compression system works, and the intermediate pressure water vapor in the gas storage and cooling water tank 54 is sucked and compressed by the water vapor compressor 61 through the compressor suction pipe 60, and the water vapor with higher temperature and pressure is produced and supplied to the user through the compressor exhaust pipe 62. In the process of the water vapor compressor 61 compressing the intermediate pressure water vapor, the high temperature water working medium in the high temperature evaporation tank 10 is sent to the compression chamber of the water vapor compressor 61 by the compressor water supply pump 65 through the compressor water supply pipe 64 and the third regulating valve 63, and absorbs the superheat generated by the compression of the intermediate pressure water vapor by the water vapor compressor 61 in the compression chamber, reduces the temperature of the final exhaust of the water vapor, and ensures the safe and stable operation of the unit.

[0045] In the above system, the high temperature evaporation tank 10, the low temperature evaporation tank 13 and the gas storage and cooling water tank 54 not only have the function of generating water vapor but also serve as storage bodies for water working medium and water vapor.

[0046] In a specific embodiment, the water medium in the solar collector 22 is heated by the solar energy absorbed by the solar collector 22, and the temperature is raised to 110°C. It flows into the high-temperature evaporation tank 10 through the solar water outlet pipe 24, and flash evaporation occurs in the high-temperature evaporation tank 10, which can produce saturated water at 100°C and saturated water vapor at 1 bar and 100°C. The saturated water at 100°C flows into the low-temperature evaporation spiral tube 14 through the solar connecting pipe 11 and the solar circulating pump 12, heats the water medium in the low-temperature evaporation tank 13, and the temperature is reduced to 90°C when it flows out of the low-temperature evaporation spiral tube 14. Water vapor at 85°C and 0.579 bar can be generated in the low-temperature evaporation tank 13. The water medium at 90°C flows into the supplementary water heater 18 through the solar water return pipe 15, and further heats the supplementary water medium at a normal temperature of about 20°C flowing from the supplementary water heating pipe 25 into the supplementary water heater 18. At the same time, the temperature of the water medium at 90°C is further reduced to 85°C, and the heat from the solar energy is further utilized. Finally, the 85°C water medium flows back into the solar collector 22 through the solar water inlet pipe 21 and is further heated, while the 20°C supplementary water medium temperature can be raised to 85°C, and flows into the low-temperature evaporator 13 and the high-temperature evaporator 10 through the water supply pipe 26 and the water supply bypass pipe 28, respectively. Subsequently, the 100°C, 1 bar saturated water vapor in the high-temperature evaporator 10 ejects the 85°C, 0.579 bar water vapor in the low-temperature evaporator 13 through the ejector pump 51, and finally forms water vapor with a pressure exceeding 0.579 bar in the gas storage and cooling water tank 54. According to the different performance of the ejector pump and the different flow ratio of 1 bar water vapor to 0.579 bar water vapor, the water vapor pressure generated in the gas storage and cooling water tank 54 can reach between 0.579 and 1 bar, and is finally sucked in and compressed by the water vapor compressor 61 to supply steam above 1.2 bar. Because the suction pressure of the water vapor compressor 61 exceeds 0.579 bar at this time, compared with directly compressing the water vapor at a pressure of 0.579 bar in the low-temperature evaporator 13, the performance of the water vapor compressor 61 will be greatly improved with the increase of the suction pressure. Compared with directly recovering the waste heat from 110°C to 85°C through flash evaporation, direct flash evaporation can also produce 85°C, 0.579 bar steam, but the final suction pressure of the compressor is also 0.579 bar, which cannot further improve the performance of the water vapor compressor and the overall performance of the system. At the same time, the water replenishment temperature cannot be increased for replenishment, which will make the replenishment temperature low, thereby affecting the temperature of the water working medium in the high-temperature evaporator 10 and the low-temperature evaporator 13, and affecting the generation of water vapor.

[0047] In the present application, by using a high-temperature evaporation tank 10, a solar circulation pump 12, a low-temperature evaporation tank 13, a low-temperature evaporation spiral tube 14, a solar collector 22 and a flash valve 23, it is realized to use solar energy to heat the water working medium to produce high-temperature hot water. Flash evaporation in the high-temperature evaporation tank 10 produces high-temperature and high-pressure water vapor, and heat exchange in the low-temperature evaporation tank 13 produces low-temperature and low-pressure water vapor, which realizes the secondary utilization of solar energy, can more fully utilize the heat in high-temperature hot water, improve the utilization rate of solar energy, and solar energy as a clean and renewable energy can effectively reduce the consumption of primary energy such as fossil fuels, thereby helping energy conservation and emission reduction, and promoting the early realization of carbon neutrality. By using an ejector pump to use the high-temperature and high-pressure steam generated by the solar double-effect evaporation system to heat compress the steam with lower temperature and pressure, generate medium-pressure steam, and achieve the pressure increase of the steam with lower temperature and pressure, it is beneficial to increase the suction pressure of the water vapor compressor 61, thereby improving the energy efficiency of the entire system and reducing the power consumption of the system. Finally, the medium-pressure steam is further compressed, increased in pressure and temperature by the water vapor compressor 61 to produce steam with higher temperature and pressure to meet the needs of users. Mechanical compression has high efficiency and strong stability, and can effectively increase the steam pressure and temperature to ensure the efficient and stable operation of the system. The combination of solar double-effect evaporation system, thermal compression and mechanical compression realizes the high-temperature and high-pressure steam from solar energy to meet the needs of users, making full use of clean and renewable solar energy resources. Compared with the existing coal-fired and gas-fired boilers, this system only uses electricity to provide steam, which is cleaner and more environmentally friendly. Compared with electric boilers, this system uses solar energy, and the power and energy consumption are greatly reduced.

[0048] It is obvious to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above, and that the present application can be implemented in other specific forms without departing from the spirit or essential features of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present application. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A solar double-effect evaporation and mechanical two-stage compression heat pump steam system, It is characterized in that The solar double-effect evaporation injection and mechanical two-stage compression heat pump steam system comprises a solar double-effect evaporation system, a thermal compression system and a mechanical compression system; The solar double-effect evaporation system comprises a solar collector, a high-temperature evaporation tank, a solar circulation pump, a low-temperature evaporation tank, a water supply heating pipe and a water supply heater, wherein the low-temperature evaporation tank is provided with a low-temperature evaporation spiral pipe, the solar collector, the high-temperature evaporation tank, the solar circulation pump, the high-temperature evaporation spiral pipe and the water supply heater are sequentially connected to form a fluid flow loop, the water supply heating pipe is fluidically connected to the water supply heater, and the water supply heater is fluidically connected to at least one of the high-temperature evaporation tank and the low-temperature evaporation tank; The solar double-effect evaporation system further includes a water supply pipe and a water supply bypass pipe, wherein the water supply heating pipe, the water supply heater, the water supply pipe and the low-temperature evaporation tank form a fluid flow passage, the water supply heating pipe, the water supply heater, the water supply bypass pipe and the high-temperature evaporation tank form a fluid flow passage, the first end of the water supply bypass pipe is in fluid communication with the high-temperature evaporation tank, and the second end of the water supply bypass pipe is in fluid communication with the water supply pipe; Wherein, the thermal compression system comprises a high-temperature evaporation tank, a low-temperature evaporation tank, an ejector pump and a gas storage and cooling water tank, the high-temperature evaporation tank is in fluid communication with the air inlet end of the ejector pump, and is used to provide high-pressure gas to the ejector pump, the low-temperature evaporation tank is in fluid communication with the air inlet end of the ejector pump, and is used to provide low-pressure gas to the ejector pump, and the exhaust end of the ejector pump is in fluid communication with the gas storage and cooling water tank; Among them, the mechanical compression system includes a high-temperature evaporation tank, a compressor water supply pump, a water vapor compressor and a gas storage and cooling water tank. The gas storage and cooling water tank is used to provide gas to the water vapor compressor. The high-temperature evaporation tank, the compressor water supply pump and the water vapor compressor form a fluid flow path for replenishing water to the water vapor compressor.

2. The solar double-effect evaporation and mechanical two-stage compression heat pump steam system as claimed in claim 1, It is characterized in that The thermal compression system also includes a water tank circulation pump, and the low-temperature evaporation tank, the water tank circulation pump and the gas storage and cooling water tank form a fluid flow loop.

3. The solar double-effect evaporation and mechanical two-stage compression heat pump steam system as claimed in claim 1 or 2, It is characterized in that The high-temperature evaporation tank includes a high-temperature evaporation tank drain pipe, and the low-temperature evaporation tank includes a low-temperature evaporation tank drain pipe.

4. The solar double-effect evaporation and mechanical two-stage compression heat pump steam system as claimed in claim 1, It is characterized in that In the solar double-effect evaporation system, the solar collector is in fluid communication with the high-temperature evaporation tank through a solar water outlet pipe, and a flash valve is provided on the solar water outlet pipe, the high-temperature evaporation tank is in fluid communication with a solar circulation pump through a solar connecting pipe, the solar circulation pump is in fluid communication with a first end of a low-temperature evaporation spiral tube, the second end of the low-temperature evaporation spiral tube is in fluid communication with a make-up water heater through a solar water return pipe, and the make-up water heater is in fluid communication with the solar collector through a solar water inlet pipe; The water replenishment heating pipe is used to replenish water to the water replenishment heater, the water replenishment heater is in fluid communication with the low-temperature evaporator through the water replenishment pipe, and a fourth stop valve is provided on the water replenishment pipe. Meanwhile, the water replenishment heater is in fluid communication with the high-temperature evaporator through a water replenishment bypass pipe, an intersection of the water replenishment bypass pipe and the water replenishment pipe is between the water replenishment heater and the fourth stop valve, and a third stop valve is provided on the water replenishment bypass pipe.

5. The solar double-effect evaporation and mechanical two-stage compression heat pump steam system as claimed in claim 1, It is characterized in that In the thermal compression system, the high-temperature evaporation tank is in fluid communication with the inlet end of the ejector pump through the power inlet pipe, the low-temperature evaporation tank is in fluid communication with the inlet end of the ejector pump through the ejector inlet pipe, and the outlet end of the ejector pump is in fluid communication with the gas storage and cooling water tank through the ejector pump exhaust pipe; The low-temperature evaporator is fluidically connected to the water tank circulation pump, the water tank circulation pump is fluidically connected to the gas storage and cooling water tank through a water tank circulation pipe, and a second regulating valve is provided on the water tank circulation pipe, the gas storage and cooling water tank is fluidically connected to the low-temperature evaporator through a water tank return pipe, and a first regulating valve is provided on the water tank return pipe.

6. The solar double-effect evaporation and mechanical two-stage compression heat pump steam system as claimed in claim 5, It is characterized in that The ejector pump is in fluid communication with the gas storage and cooling water tank through an ejector pump exhaust pipe, and the gas outlet is arranged below the liquid level of the gas storage and cooling water tank.

7. The solar double-effect evaporation and mechanical two-stage compression heat pump steam system as claimed in claim 1, It is characterized in that In the mechanical compression system, the high-temperature evaporator, the compressor water supply pump and the water vapor compressor are fluidically connected through the compressor water supply pipe, and a third regulating valve is provided on the compressor water supply pipe; The gas storage and cooling water tank is fluidly connected to the water vapor compressor through the compressor suction pipe, and the water vapor compressor transmits compressed gas to the outside through the compressor exhaust pipe.

8. The working method of the solar double-effect evaporation injection and mechanical two-stage compression heat pump steam system according to any one of claims 1 to 7, It is characterized in that The method comprises the following steps: First, the solar double-effect evaporation system starts working. The solar collector collects solar energy and heats the water working medium to obtain high-temperature hot water. The high-temperature hot water then flashes in the high-temperature evaporation tank to produce high-temperature and high-pressure water vapor and high-temperature saturated water. The high-temperature saturated water exchanges heat with the water in the low-temperature evaporation tank to produce low-temperature and low-pressure water vapor and low-temperature saturated water. The low-temperature saturated water heats the supplementary water through the supplementary water heater and then circulates back to the solar collector. Secondly, the thermal compression system starts to work, and the high-temperature and high-pressure water vapor generated in the high-temperature evaporation tank is ejected by the ejector pump to eject the low-temperature and low-pressure water vapor in the low-temperature evaporation tank, obtaining medium-pressure water vapor, which then enters the gas storage and cooling water tank; Finally, the medium-pressure water vapor is compressed by the water vapor compressor to form high-temperature and high-pressure water vapor. At the same time, the high-temperature water in the high-temperature evaporation tank is replenished to the water vapor compressor through the compressor water replenishment pump.

9. The method according to claim 8, It is characterized in that The temperature of the high-temperature hot water is 110°C; the temperature of the high-temperature and high-pressure steam is 100°C, and the pressure is 1 bar; the temperature of the low-temperature and low-pressure steam is 85°C, and the pressure is 0.579 bar.

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