A multi-stage cold and heat accumulation condensing system

Abstract

A multi-stage cold storage and heat storage condensing system, comprising a condensing system, a cold storage system and a heat storage system, characterized in that the condensing system comprises a condenser, a condenser hot well and a condensate backwater system; the cold storage system comprises a cold storage tank, a water supply unit, a cold storage circulating system and a water supply spraying device; the heat storage system comprises a low-temperature heat storage tank, a high-temperature heat storage tank, a heat pump and a heat storage circulating system; when the ambient temperature is relatively high, the cold storage system is coordinated to release cold and the heat storage system is coordinated to store heat; when the ambient temperature is relatively low, the heat storage system is coordinated to release heat and the cold storage system is coordinated to store cold; during a high-temperature period, the condensate stored in the cold storage system during a low-temperature period is directly used to reduce the steam temperature in the condenser through the water supply atomizing device, and the heat pump can be used to further reduce the steam heat load of the condenser, thereby effectively improving the cooling efficiency and the unit vacuum during the high-temperature period; during a low-temperature period, the heat storage system releases heat to the condensing system, thereby effectively reducing the condensate supercooling degree in the condenser hot well and reducing the regenerative steam extraction.

Description

Technical Field

[0001] This invention relates to energy storage technology for thermal cycle systems, specifically to a multi-stage condensing system for cold and heat storage. Background Technology

[0002] The actual operation of thermal power units in my country exhibits distinct peak-valley characteristics. During the day, when temperatures are high, peak power needs to be supplied, which can easily lead to overload operation of the units, increased power consumption, and low power plant efficiency. At night, when temperatures are low, only off-peak power needs to be supplied, resulting in low condenser load, but the power plant still needs basic power to maintain the operation of its facilities.

[0003] In recent years, the application of cold and heat storage technology in thermal power units has received widespread attention. Common cold and heat storage technologies are mainly applicable to cooling towers in thermal power generation systems. However, the effect of cold and heat storage is easily affected by the structure or physical characteristics of the cooling tower itself. In order to fundamentally improve the power generation efficiency of thermal power units, this patent proposes a multi-stage cold and heat storage condensing system, which applies cold and heat storage technology to the condensing equipment in thermal power generation systems. It is widely applicable to various cooling systems with condensing equipment, such as wet cooling systems and indirect air cooling systems, in order to achieve a high-economic power generation mode of peak shaving and valley filling. Summary of the Invention

[0004] A multi-stage cold and heat storage condensing system can utilize diurnal temperature differences to store cold and release heat when the ambient temperature is low, and store heat and release cold when the ambient temperature is high. The energy storage and release levels are adjustable and flexible, achieving a relatively constant unit back pressure under different ambient temperatures. When the ambient temperature is high, the condensate stored in the cold storage system during low ambient temperatures is used to directly reduce the steam temperature in the condenser through a water atomization device. At the same time, a heat pump can be used to further reduce the steam heat load of the condenser, effectively improving cooling efficiency and unit vacuum during high-temperature periods. During low-temperature periods, the heat storage system releases heat to the condensing system, effectively reducing the subcooling of the condensate in the condenser hot well and reducing the need for regenerative steam extraction. The specific scheme is as follows.

[0005] A multi-stage condensing system for cold and heat storage includes a condensing system, a cold storage system, and a heat storage system. The condensing system comprises a condenser, a condenser hot well, and a condensate return system; the condensate return system comprises a condensate pipeline, a condensate pump, a pressurized condensate pipeline, and a regenerative heater; the cold storage system comprises a makeup water unit, a cold storage tank, a cold storage circulation system, and a makeup water spray device; the makeup water unit comprises a makeup water device, a makeup water valve, and a bypass valve; the cold storage circulation system comprises a first cold storage valve, a second cold storage valve, a condensate discharge valve, a cold water pump unit, and a bypass valve; one end of the first cold storage valve is connected to the pressurized condensate pipeline, and the other end... One end is connected to the cold storage tank; one end of the second cold storage valve is connected to the water supply device, and the other end is connected to the cold storage tank; one end of the cold release valve is connected to the cold storage tank, and the other end is connected to the cold water pump unit; the water supply device, the second cold storage valve, the cold storage tank, the cold release valve, the cold water pump unit, and the water supply spray device are connected in sequence; the heat storage system includes a low-temperature heat storage tank, a heat pump, a high-temperature heat storage tank, and a heat storage circulation system; the heat storage circulation system includes a heating valve, a heat storage water inlet pipe, a heat storage water return pipe, a heat storage valve, a first heat release valve, a second heat release valve, a low-temperature hot water pump unit, a high-temperature hot water pump unit, a third heat release valve, a fourth heat release valve, and a fifth heat release valve; One end of the heating valve is connected to the low-temperature heat storage tank, and the other end is connected to the heat exchanger in the heat pump; the heat storage valve is installed on the heat storage water supply pipe; the heat storage return pipe connects the low-temperature heat storage tank and the low-temperature hot water pump unit; one end of the first heat release valve is connected to the low-temperature hot water pump unit, and the other end is connected to the condenser hot well; one end of the second heat release valve is connected to the low-temperature hot water pump unit, and the other end is connected to the condensate pipe; the low-temperature hot water pump unit is installed on the heat storage return pipe; one end of the high-temperature hot water pump unit is connected to the high-temperature heat storage tank, and the other end is connected to the third and fourth heat release valves; one end of the third heat release valve is connected to the outlet of the high-temperature hot water pump unit, and the other end... The first heat release valve is connected to the inlet of the regenerating heater; one end of the fourth heat release valve is connected to the outlet of the high-temperature hot water pump unit, and the other end is connected to the outlet of the regenerating heater; one end of the fifth heat release valve is connected to the low-temperature hot water pump unit, and the other end is connected to the pressurized condensate pipeline. The connection point between the fifth heat release valve and the pressurized condensate pipeline should be after the connection point between the first cold storage valve and the pressurized condensate pipeline; the heat pump includes an evaporator, a compressor, a heat exchanger, and an expansion valve; a multi-stage cold and heat storage condensing system coordinates the cold storage system's cold release and the heat storage system's heat storage when the ambient temperature is high, and coordinates the heat storage system's heat release and the cold storage system's cold storage when the ambient temperature is low, thereby improving the efficiency of the condensing system.

[0006] The condenser is a shell-and-tube heat exchanger that condenses steam into condensate and collects the condensate into a condenser hot well. The condenser hot well is a water collection container installed at the bottom of the condenser to collect the condensate produced by the condenser and connect it to the condensate return system. The condensate pipeline transports the condensate from the condenser hot well to the condensate pump, which pressurizes the condensate and then transports it to the regenerative heater via the pressurized condensate pipeline.

[0007] The water supply device is connected to the condenser hot well via a water supply valve and to a water supply spray device via a bypass valve. It is also connected to a cold storage tank via a cold storage circulation system. The water supply device either atomizes water supply to the condenser or directly supplies water to the condenser hot well via the bypass valve to ensure a relatively constant water level in the condenser hot well. One end of the water supply valve is connected to the water supply device, and the other end is connected to the condenser hot well. The bypass valve is located on a parallel branch line from the water supply device to the water supply spray device. The water supply spray device sprays the supply water from the water supply device into the condenser, with a flow rate of Q1 tons / hour. The supply water flow rate from the water supply device to the condenser hot well via the water supply valve is Q6 tons / hour.

[0008] The cold storage tank is connected to a pressurized condensate pipeline and a water spray device through a cold storage circulation system; the cold storage tank is used to store part of the condensate in the condensation system when the ambient temperature is low, and the cold storage tank is installed on the ground or underground, and the cold storage tank is insulated.

[0009] The cold water pump unit consists of N parallel pumps, where N ≥ 1 and N is an integer. It can pressurize the condensate in the cold storage tank and supply it to the water replenishment spray device.

[0010] The low-temperature heat storage tank is connected to the condenser hot well, condensate return system, and heat pump through a heat storage circulation system; the low-temperature heat storage tank is used to store part of the hot condensate in the condensate return system when the ambient temperature is high; the low-temperature heat storage tank is installed on the ground or underground, and the low-temperature heat storage tank should be insulated.

[0011] The evaporator is located in the condenser. The compressor compresses the medium, raising its temperature. After heat exchange is performed by the heat exchanger to release the heat, the medium temperature is further reduced by the expansion valve. The low-temperature medium absorbs the heat of the steam in the condenser and enters the compressor to circulate. The medium is water or refrigerant.

[0012] The high-temperature heat storage tank is connected to a heat pump and a condensate return system through a heat storage circulation system; the high-temperature heat storage tank is used to store high-temperature condensate generated after the hot condensate in the low-temperature heat storage tank absorbs heat through the heat pump; the high-temperature heat storage tank is installed on the ground or underground, and the high-temperature heat storage tank should be insulated.

[0013] When the ambient temperature is high, the heat storage water supply pipe transports a portion of the hot condensate from the pressurized condensate pipe to the low-temperature heat storage tank; the heat storage return water pipe, via a low-temperature hot water pump unit, sends the hot condensate from the low-temperature heat storage tank to the first, second, or fifth heat release valve; the low-temperature hot water pump unit is equipped to supply the hot condensate from the low-temperature heat storage tank to the pressurized condensate pipe; the high-temperature hot water pump unit can supply the high-temperature condensate from the high-temperature heat storage tank to the inlet of the regenerator via the third heat release valve or to the outlet of the regenerator via the fourth heat release valve.

[0014] The low-temperature hot water pump unit is a parallel pump with M lines, where M ≥ 1 and M is an integer; the high-temperature hot water pump unit is a parallel pump with C lines, where C ≥ 1 and C is an integer; the flow rate of the thermal storage water supply pipe is Q2 tons / hour; the flow rate of the low-temperature hot water pump unit is Q4 tons / hour; the flow rate of the high-temperature hot water pump unit is Q5 tons / hour; the flow rate of the first cold storage valve is Q3 tons / hour; when the ambient temperature is low, the sum of the flow rate Q3 through the first cold storage valve, the flow rate Q4 of the low-temperature hot water pump unit, the flow rate Q5 of the high-temperature hot water pump unit, and the flow rate Q6 of the water supply device from the water supply valve to the condenser hot well should meet the condensate return water requirement; when the ambient temperature is high, the sum of the flow rate Q1 of the water supply spray device, the flow rate Q2 of the thermal storage water supply pipe, and the flow rate Q6 of the water supply device from the water supply valve to the condenser hot well should meet the condensate return water requirement. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a multi-stage cold and heat storage condensing system according to one embodiment of the present invention.

[0016] In the diagram: 1—Condenser, 2—Condenser hot well, 3—Condensate pump, 4—Regenerative heater, 5—Condensate pipe, 6—Pressurized condensate pipe, 7—Make-up water device, 8—Evaporator, 9—Compressor, 10—Heat exchanger, 11—Expansion valve, 12—Heating valve, 13—First cold storage valve, 14—Second cold storage valve, 15—Cold storage tank, 16—Cold release valve, 17—Cold water pump unit, 18—Make-up water spray device, 19—Bypass valve, 20—Low-temperature heat storage tank, 21—High-temperature heat storage tank, 22—Heat storage water inlet pipe, 23—Heat storage water return pipe, 24—Heat storage valve, 25—First heat release valve, 26—Second heat release valve, 27—Low-temperature hot water pump unit, 28—High-temperature hot water pump unit, 29—Make-up water valve, 30—Third heat release valve, 31—Fourth heat release valve, 32—Fifth heat release valve. Detailed Implementation

[0017] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0018] As attached Figure 1 As shown, a multi-stage cold and heat storage condensing system includes: a condenser 1, a condenser hot well 2, a condensate pump 3, a regenerative heater 4, a condensate pipe 5, a pressurized condensate pipe 6, a water supply device 7, an evaporator 8, a compressor 9, a heat exchanger 10, an expansion valve 11, a heating valve 12, a first cold storage valve 13, a second cold storage valve 14, a cold storage tank 15, a cold release valve 16, a cold water pump unit 17, a water supply spray device 18, a bypass valve 19, a low-temperature heat storage tank 20, a high-temperature heat storage tank 21, a heat storage water supply pipe 22, a heat storage water return pipe 23, a heat storage valve 24, a first heat release valve 25, a second heat release valve 26, a low-temperature hot water pump unit 27, a high-temperature hot water pump unit 28, a water supply valve 29, a third heat release valve 30, a fourth heat release valve 31, and a fifth heat release valve 32.

[0019] As attached Figure 1As shown, the condenser 1, condenser hot well 2, condensate pipeline 5, condensate pump 3, pressurized condensate pipeline 6, and regenerator 4 are connected in sequence to form the condensing system; the water supply device 7, second cold storage valve 14, cold storage tank 15, cold release valve 16, cold water pump unit 17, and water supply spray device 18 are connected in sequence. The water supply device 7 can atomize water supply to the condenser 1 through 18, and can directly supply water to the condenser hot well 2 through the water supply valve 29; one end of the water supply valve 29 is connected to the water supply device 7, and the other end is connected to the condenser hot well 2; the bypass valve 19 is installed in the self-replenishing... On the parallel branch from the water device 7 to the water spray device 18; one end of the first cold storage valve 13 is connected to the pressurized condensate pipe 6, and the other end is connected to the cold storage tank 15; the evaporator 8 is installed in the condenser 1, the compressor 9 compresses the medium, the medium undergoes heat exchange in the heat exchanger 10, and the medium temperature is further reduced by the expansion valve 11, the medium is a refrigerant; one end of the heat storage water supply pipe 22 is connected to the pressurized condensate pipe 6, and the other end is connected to the low temperature heat storage tank 20, the heat storage water supply pipe 22, the low temperature heat storage tank 20, and the heat storage return water pipe 23 are connected in sequence; the first heat release valve 2 One end of the condensate pipe 26 is connected to the low-temperature hot water pump unit 27, and the other end is connected to the condenser well 2; one end of the second heat release valve 26 is connected to the low-temperature hot water pump unit 27, and the other end is connected to the condensate pipe 5; the low-temperature hot water pump unit 27 is installed on the heat storage return water pipe 23, and the low-temperature hot water pump unit 27 is a two-way parallel pump; a heating valve 12 is provided between the low-temperature heat storage tank 20 and the heat exchanger 10, and the condensate water that has absorbed heat in the heat exchanger enters the high-temperature heat storage tank 21 along the pipe; one end of the high-temperature hot water pump unit 28 is connected to the high-temperature heat storage tank 21, and the other end is connected to the third heat release valve. Door 30, fourth heat release valve 31, high-temperature hot water pump unit is a 2-way parallel pump, third heat release valve 30 is connected at one end to high-temperature hot water pump unit 28 and at the other end to the inlet of regenerating heater 4; fourth heat release valve 31 is connected at one end to high-temperature hot water pump unit 28 and at the other end to the outlet of regenerating heater 4; fifth heat release valve 32 is connected at one end to low-temperature hot water pump unit 27 and at the other end to pressurized condensate pipe 6, the connection point of fifth heat release valve 32 and pressurized condensate pipe 6 is after the connection point of first cold storage valve 13 and pressurized condensate pipe 6.

[0020] As attached Figure 1 The diagram shows a multi-stage cold and heat storage condensing system, with the inlet steam flow rate of condenser 1 being 2880.0 t / h.

[0021] As attached Figure 1The multi-stage cold and heat storage condensing system shown has the following cold storage and heat release mode: the first cold storage valve 13 is opened, and part of the condensate water in the condensing system 6 is drawn into the cold storage tank 15 through the first cold storage valve 13. The water flow rate into the cold storage tank 15 through the first cold storage valve 13 is 1080 t / h; the second cold storage valve 14, the cold release valve 16, the cold water pump unit 17, the bypass valve 19, and the heat storage valve 24 are closed; the heat release method should be determined according to the condensate temperature to select different heat release methods. The difference between the saturation temperature corresponding to the unit exhaust steam pressure and the condensate tank water temperature is called the subcooling. When the subcooling is ≥1℃, the condenser hot well 2 is taken as the main heat release target. At this time, the first heat release valve 25 and the low temperature hot water pump unit 27 are opened, and the second heat release valve 26, the high temperature hot water pump unit 28, the heating valve 12, the third heat release valve 30, the fourth heat release valve 31, and the fifth heat release valve 32 are opened. When the low-temperature heat storage tank 20 is closed, the hot condensate in the low-temperature heat storage tank 20 enters the condenser hot well 2 through the heat storage return water pipe 23 and the first heat release valve 25. The water flow rate through the first heat release valve 25 is 1060 t / h, which reduces the condensate temperature in the condenser hot well 2 and reduces the subcooling. When the subcooling is <1℃ and the difference between the saturation temperature corresponding to the pipe pressure of the condensate pipe 5 before the condensate pump 3 and the water temperature in the low-temperature heat storage tank 20 is ≥5℃, the condensate pipe 5 is taken as the main heat release object. At this time, the second heat release valve 26 and the low-temperature hot water pump unit 27 are opened, and the first heat release valve 25, the high-temperature hot water pump unit 28, the heating valve 12, the third heat release valve 30, the fourth heat release valve 31, and the fifth heat release valve 32 are closed. The hot condensate in the low-temperature heat storage tank 20 enters the condensate pipe 5 through the heat storage return water pipe 23 and the second heat release valve 26. The water flow rate through the second heat release valve 26 is 1060 t / h.When the subcooling is <1℃ and the difference between the saturation temperature corresponding to the pipe pressure of the condensate pipe 5 before the condensate pump 3 and the water temperature in the low-temperature heat storage tank 20 is <5℃, the pressurized condensate pipe 6 is used as the main heat release target. At this time, the low-temperature hot water pump unit 27 and the fifth heat release valve 32 are open, and the first heat release valve 25, the second heat release valve 26, the third heat release valve 30, the fourth heat release valve 31, the high-temperature hot water pump unit 28, and the heating valve 12 are closed. The hot condensate in the low-temperature heat storage tank 20 flows along the heat storage return water pipe 23. The low-temperature hot water pump unit 27 enters the pressurized condensate pipeline 6. The water flow rate through the low-temperature hot water pump unit 27 is 1060 t / h, which does not affect the cold storage tank 15. Alternatively, it can be used for another heat release method. The high-temperature hot water pump unit 28 and the heating valve 12 are opened, while the first heat release valve 25, the second heat release valve 26, the low-temperature hot water pump unit 27, and the fifth heat release valve 32 are closed. The heat pump is turned on, and the hot condensate in the low-temperature heat storage tank 20 enters the heat exchanger 10 along the heating valve 12 to absorb heat and become high-temperature condensate. The water temperature enters the high-temperature heat storage tank 21, and the difference between the water temperature in the high-temperature heat storage tank 21 and the inlet and outlet water temperatures of the regenerator 4 are compared. If the difference between the water temperature in the high-temperature heat storage tank 21 and the inlet water temperature of the regenerator 4 is smaller, then the inlet of the regenerator 4 is taken as the main heat release target. At this time, the third heat release valve 30 is opened and the fourth heat release valve 31 is closed. The high-temperature hot water pump unit 28 supplies the high-temperature condensate stored in the high-temperature heat storage tank 21 to the inlet of the regenerator 4. If the difference between the water temperature in the high-temperature heat storage tank 21 and the inlet water temperature of the regenerator 4 is smaller, then the inlet of the regenerator 4 is taken as the main heat release target. If the temperature difference at the outlet of heater 4 is smaller, then the outlet of the regenerative heater 4 becomes the primary heat release target. In this case, the third heat release valve 30 is closed, and the fourth heat release valve 31 is opened. The high-temperature hot water pump unit 28 supplies the high-temperature condensate stored in the high-temperature heat storage tank 21 to the outlet of the regenerative heater 4, further reducing the amount of regenerative steam extraction. The water flow rate through the high-temperature hot water pump unit 28 is 1060 t / h. In the cold storage and heat release mode, the opening and closing of the makeup water valve 29 should be selected based on whether the condenser hot well water level 2 meets the normal operating requirements of the unit.

[0022] As attached Figure 1The heat storage and cooling mode of a multi-stage cold and heat storage condensing system is as follows: the first cold storage valve 13, the second cold storage valve 14, and the bypass valve 19 are closed; the cooling valve 16 and the cold water pump unit 17 are open; the condensate in the cold storage tank 15 is atomized and replenished to the condenser 1 through the water replenishment spray device 18, thereby reducing the steam temperature in the condenser 1; the water flow rate through the water replenishment spray device 18 is 1403 t / h; the first heat release valve 25, the second heat release valve 26, the low-temperature hot water pump unit 27, and the high-temperature hot water pump unit 28 are also present. 28. Heating valve 12, third heat release valve 30, fourth heat release valve 31, and fifth heat release valve 32 are closed, and heat storage valve 24 is opened. Part of the condensate in the pressurized condensate pipeline 6 enters the low-temperature heat storage tank 20 through the heat storage water supply pipe 22 and heat storage valve 24 for use in the cold storage and heat release mode. The water flow rate through heat storage valve 24 is 1900t / h. In the heat storage and cold release mode, the heat pump does not need to be turned on. In the heat storage and cold release mode, the opening and closing of the makeup water valve 29 should be selected according to whether the condenser hot well water level 2 meets the normal operation requirements of the unit.

[0023] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects. The scope of the present invention is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention, and no reference numerals in the claims should be regarded as limiting the scope of the claims.

[0024] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-stage cold storage and heat storage condensing system comprising a condensing system, a cold storage system, and a heat storage system, characterized in that The condensing system comprises a condenser, a condenser hot well, a condensate backwater system; the condensate backwater system comprises a condensate pipeline, a condensate pump, a pressurized condensate pipeline, a regenerative heater; the cold storage system comprises a water supply unit, a cold storage tank, a cold storage circulating system, a water supply spraying device; the water supply unit comprises a water supply device, a water supply valve, a bypass valve; the cold storage circulating system comprises a first cold storage valve, a second cold storage valve, a cold release valve, a cold water pump unit, a bypass valve; one end of the first cold storage valve is connected with the pressurized condensate pipeline, and the other end is connected with the cold storage tank; one end of the second cold storage valve is connected with the water supply device, and the other end is connected with the cold storage tank; one end of the cold release valve is connected with the cold storage tank, and the other end is connected with the cold water pump unit; the water supply device, the second cold storage valve, the cold storage tank, the cold release valve, the cold water pump unit and the water supply spraying device are sequentially connected; the heat storage system comprises a low-temperature heat storage tank, a heat pump, a high-temperature heat storage tank and a heat storage circulating system; the heat storage circulating system comprises a heating valve, a heat storage water supply pipeline, a heat storage backwater pipeline, a heat storage valve, a first heat release valve, a second heat release valve, a low-temperature hot water pump unit, a high-temperature hot water pump unit, a third heat release valve, a fourth heat release valve and a fifth heat release valve; one end of the heating valve is connected with the low-temperature heat storage tank, and the other end is connected with a heat exchanger in the heat pump; the heat storage valve is arranged on the heat storage water supply pipeline; the heat storage backwater pipeline connects the low-temperature heat storage tank with the low-temperature hot water pump unit; one end of the first heat release valve is connected with the low-temperature hot water pump unit, and the other end is connected with the condenser hot well; one end of the second heat release valve is connected with the low-temperature hot water pump unit, and the other end is connected with the condensate pipeline; the low-temperature hot water pump unit is arranged on the heat storage backwater pipeline; one end of the high-temperature hot water pump unit is connected with the high-temperature heat storage tank, and the other end is connected with the third heat release valve and the fourth heat release valve; one end of the third heat release valve is connected with the outlet of the high-temperature hot water pump unit, and the other end is connected with the inlet of the regenerative heater; one end of the fourth heat release valve is connected with the outlet of the high-temperature hot water pump unit, and the other end is connected with the outlet of the regenerative heater; one end of the fifth heat release valve is connected with the low-temperature hot water pump unit, and the other end is connected with the pressurized condensate pipeline; the connection point of the fifth heat release valve and the pressurized condensate pipeline should be after the connection point of the first cold storage valve and the pressurized condensate pipeline; the heat pump comprises an evaporator, a compressor, a heat exchanger and an expansion valve; the multi-stage cold storage and heat storage condensing system coordinates the cold release of the cold storage system and the heat storage of the heat storage system when the ambient temperature is relatively high, coordinates the heat release of the heat storage system and the cold storage of the cold storage system when the ambient temperature is relatively low, and improves the efficiency of the condensing system.

2. The multi-stage regenerative condensing system of claim 1, wherein: The condenser is a shell-and-tube heat exchanger, which condenses steam into condensate water and collects the condensate water into the condenser hot well; the condenser hot well is a water collecting container installed at the bottom of the condenser, which is used for collecting the condensate water generated by the condenser and connected with the condensate backwater system; the condensate pipeline transports the condensate water in the condenser hot well to the condensate pump, which is pressurized by the condensate pump and then transported to the regenerative heater through the pressurized condensate pipeline.

3. The multi-stage regenerative condensing system of claim 1, wherein: The water supply device is connected to the condenser hot well via a water supply valve and to a water supply spray device via a bypass valve. It is also connected to a cold storage tank via a cold storage circulation system. The water supply device either atomizes water supply to the condenser or directly supplies water to the condenser hot well via the bypass valve to ensure a relatively constant water level in the condenser hot well. One end of the water supply valve is connected to the water supply device, and the other end is connected to the condenser hot well. The bypass valve is located on a parallel branch line from the water supply device to the water supply spray device. The water supply spray device sprays the supply water from the water supply device into the condenser, with a flow rate of Q1 tons / hour. The supply water flow rate from the water supply device to the condenser hot well via the water supply valve is Q6 tons / hour.

4. The multi-stage regenerative condensing system of claim 1, wherein: The cold storage tank is connected to a pressurized condensate pipeline and a water spray device through a cold storage circulation system; the cold storage tank is used to store part of the condensate in the condensation system when the ambient temperature is low, and the cold storage tank is installed on the ground or underground, and the cold storage tank is insulated.

5. The multi-stage regenerative condensing system of claim 1, wherein: The cold water pump unit consists of N parallel pumps, where N ≥ 1 and N is an integer. It can pressurize the condensate in the cold storage tank and supply it to the water replenishment spray device.

6. The multi-stage regenerative condensing system of claim 1, wherein: The low-temperature heat storage tank is connected to the condenser hot well, condensate return system, and heat pump through a heat storage circulation system; the low-temperature heat storage tank is used to store part of the hot condensate in the condensate return system when the ambient temperature is high; the low-temperature heat storage tank is installed on the ground or underground, and the low-temperature heat storage tank should be insulated.

7. The multi-stage regenerative condensing system of claim 1, wherein: The evaporator is located in the condenser. The compressor compresses the medium, raising its temperature. After heat exchange is performed by the heat exchanger to release the heat, the medium temperature is further reduced by the expansion valve. The low-temperature medium absorbs the heat from the steam in the condenser and enters the compressor to circulate. The medium is a refrigerant.

8. The multi-stage regenerative condensing system of claim 1, wherein: The high-temperature heat storage tank is connected to a heat pump and a condensate return system through a heat storage circulation system; the high-temperature heat storage tank is used to store high-temperature condensate generated after the hot condensate in the low-temperature heat storage tank absorbs heat through the heat pump; the high-temperature heat storage tank is installed on the ground or underground, and the high-temperature heat storage tank should be insulated.

9. The multi-stage regenerative condensing system of claim 1, wherein: When the ambient temperature is high, the heat storage water supply pipe transports a portion of the hot condensate from the pressurized condensate pipe to the low-temperature heat storage tank; the heat storage return water pipe, via a low-temperature hot water pump unit, sends the hot condensate from the low-temperature heat storage tank to the first, second, or fifth heat release valve; the low-temperature hot water pump unit is equipped to supply the hot condensate from the low-temperature heat storage tank to the pressurized condensate pipe; the high-temperature hot water pump unit can supply the high-temperature condensate from the high-temperature heat storage tank to the inlet of the regenerator via the third heat release valve or to the outlet of the regenerator via the fourth heat release valve.

10. The multi-stage regenerative condensing system of claim 1, wherein: The low-temperature hot water pump unit is a parallel pump with M lines, where M ≥ 1 and M is an integer; the high-temperature hot water pump unit is a parallel pump with C lines, where C ≥ 1 and C is an integer; the flow rate of the thermal storage water supply pipe is Q2 tons / hour; the flow rate of the low-temperature hot water pump unit is Q4 tons / hour; the flow rate of the high-temperature hot water pump unit is Q5 tons / hour; the flow rate of the first cold storage valve is Q3 tons / hour; when the ambient temperature is low, the sum of the flow rate Q3 through the first cold storage valve, the flow rate Q4 of the low-temperature hot water pump unit, the flow rate Q5 of the high-temperature hot water pump unit, and the flow rate Q6 of the water supply device from the water supply valve to the condenser hot well should meet the condensate return water requirement; when the ambient temperature is high, the sum of the flow rate Q1 of the water supply spray device, the flow rate Q2 of the thermal storage water supply pipe, and the flow rate Q6 of the water supply device from the water supply valve to the condenser hot well should meet the condensate return water requirement.

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