Hot water supply system for heat pump of ocean nuclear power platform

Abstract

The invention belongs to the technical field of heat supply, and particularly relates to an ocean nuclear power platform heat pump hot water supply system. Comprising a heat pump system and a daily hot water heating system which exchange heat through a condenser. The system has the beneficial effects that a part of waste heat existing in cooling seawater of a steam turbine condenser and strong brine of a seawater water making evaporator can be recycled through the heat pump, low-grade heat energy existing in the seawater is utilized when a wharf parking nuclear energy device does not operate, and power consumption of hot water heating is reduced. Meanwhile, the temperature of cooled seawater of a steam turbine condenser and the temperature of strong brine of a seawater making evaporator can be properly reduced, and the influence of direct discharge to the seawater temperature is reduced; cooling seawater is introduced to dilute strong brine of the seawater evaporator, so that the influence of direct discharge of the strong brine to the sea on the environment is reduced, and the corrosion of the strong brine to pipelines and equipment can be effectively reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of heating, and in particular relates to a heat pump hot water supply system for an ocean nuclear power platform. Background Art

[0002] In recent years, heat pump air conditioning technology has gradually been applied on ships. It uses water source heat pumps to extract or release heat from river water and sea water, and converts energy through specific units to achieve cooling or heating of ship air conditioning, thereby reducing ship energy consumption. Marine nuclear power platforms can use nuclear energy to generate a large amount of electricity during operation, and when the nuclear power device is not working, it can also be connected to external shore power to obtain low-cost and reliable electricity, so it can be used for electric heating to produce daily hot water. At the same time, the cooling seawater at the outlet of the turbine condenser carries a large amount of heat after passing through the condenser, and the concentrated brine discharged from the secondary circuit water making system also carries a large amount of heat, which may be further utilized.

[0003] At present, hot water supply for marine nuclear power platforms is usually carried out by electrically heating cold water, which requires a large amount of electricity. Summary of the invention

[0004] The purpose of the present invention is to provide a heat pump hot water supply system for a marine nuclear power platform, so as to make full use of waste energy and reduce the power consumption of hot water heating on board ships.

[0005] The technical solution of the present invention is as follows: a heat pump hot water supply system for an ocean nuclear power platform, comprising a heat pump system and a daily hot water heating system, wherein the heat pump system and the daily hot water heating system exchange heat through a condenser.

[0006] The heat pump system includes an evaporator, a compressor, a condenser, a liquid storage tank, a filter and an expansion valve. One end of the evaporator is connected to the compressor, the compressor is connected to the condenser, the condenser is connected to the liquid storage tank, the liquid storage tank is connected to the filter, and the filter is connected to the other end of the evaporator through the expansion valve to form a loop.

[0007] The heat pump system is a refrigerant working medium cycle.

[0008] The input of the evaporator is the concentrated brine of the seawater steam generator and the cooling seawater at the outlet of the turbine condenser, and the output is mixed discharge.

[0009] The daily hot water heating system comprises a circulating hot water pump, an electric heater, a temperature sensor, an electric water tank and a condenser shared with the heat pump circulation. The circulating hot water pump is connected to the condenser, the electric water tank is connected to the condenser, and the temperature sensor and the electric heater are arranged in the electric water tank.

[0010] When it is necessary to supply heat to the outside, under the driving pressure head provided by the circulating hot water pump, the daily cold water return from the user side flows through the condenser, and the high-temperature and high-pressure refrigerant preheats the return water through the condenser. The preheated return water enters the electric water tank through the pipeline, is further heated by the electric heater, and is combined with the temperature sensor to control the water supply temperature.

[0011] The low-temperature and low-pressure liquid refrigerant absorbs the heat of the cooling seawater of the turbine condenser and the concentrated brine of the seawater water evaporator in the steam generator to become a low-pressure gaseous refrigerant. It is then compressed by the compressor to become a high-temperature and high-pressure gaseous refrigerant. It then enters the condenser and is condensed into a high-pressure liquid refrigerant by the daily hot water return water. It then passes through the liquid storage tank and filter in turn, and finally expands through the expansion valve to become a low-temperature and low-pressure liquid refrigerant. It flows through the evaporator for heat exchange, thus completing a heat pump cycle.

[0012] The beneficial effects of the present invention are: a portion of the waste heat existing in the cooling seawater of the steam turbine condenser and the concentrated brine of the seawater water evaporator can be recovered through the heat pump, and the low-grade heat energy existing in the seawater is utilized when the nuclear energy device at the dock is not in operation, thereby reducing the power consumption of hot water heating. At the same time, the temperature of the cooling seawater of the steam turbine condenser and the concentrated brine of the seawater water evaporator can be appropriately reduced, reducing the impact of direct discharge into the sea on the seawater temperature; the introduction of cooling seawater to dilute the concentrated brine of the seawater evaporator reduces the impact of the direct discharge of concentrated brine into the sea on the environment, and can also effectively reduce the corrosion of concentrated brine to pipelines and equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of a heat pump hot water supply system for an ocean nuclear power platform provided by the present invention.

[0014] In the figure: 1 evaporator, 2 compressor, 3 condenser, 4 liquid storage tank, 5 filter, 6 expansion valve, 7 circulating hot water pump, 8 electric heater, 9 temperature sensor, 10 electric water tank. DETAILED DESCRIPTION

[0015] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0016] A heat pump hot water supply system for an offshore nuclear power platform uses a heat pump to recover waste heat from the cooling of seawater in the steam turbine condenser and concentrated brine in the seawater water evaporator for daily hot water supply on the platform. The system consists of a compressor 2, a condenser 3, a liquid storage tank 4, a filter 5, an expansion valve 6, an evaporator 1, a circulating hot water pump 7, an electric heater 8, a temperature sensor 9, an electric water tank 10, and pipes, valves and other equipment. Among them, the heat pump system covers the compressor 2, the condenser 3, the liquid storage tank 4, the filter 5, the expansion valve 6 and the evaporator 1. The functions of the entire system equipment are as follows:

[0017] Evaporator 1 exchanges heat between the cooling seawater at the outlet of the turbine condenser and the waste heat in the concentrated brine of the seawater water evaporator and the low-temperature and low-pressure liquid refrigerant in the heat pump system, so that the liquid refrigerant becomes a gaseous refrigerant;

[0018] The compressor 2 is used to compress the gaseous refrigerant to make it a high-temperature and high-pressure gaseous refrigerant;

[0019] Condenser 3 uses daily hot water return water to condense high-temperature and high-pressure gaseous refrigerant into high-pressure liquid refrigerant, and the return water heats up during heat exchange;

[0020] The liquid storage tank 4 is used to store liquid refrigerant to avoid excessive accumulation of condensate in the condenser and also to adapt to load changes of the evaporator;

[0021] The filter 5 is used to filter refrigerant impurities;

[0022] The expansion valve 6 is used to control the flow rate of the required refrigerant and reduce the refrigerant pressure to make it a low-pressure and low-temperature liquid refrigerant;

[0023] The circulating hot water pump 7 is used to provide driving pressure head for daily hot water;

[0024] The electric heater 8 is used to heat the daily hot water in the electric water tank to achieve heating and heat preservation functions;

[0025] The temperature sensor 9 is used to measure the temperature of the daily hot water in the electric heating water cabinet;

[0026] The electric water tank 10 is used to store daily hot water and has functions such as overpressure protection and discharge.

[0027] This solution takes into account that the seawater used to cool the turbine condenser and the brine used to make seawater water from the evaporator still have relatively high temperatures. A heat pump can be used to recover some of the heat energy for preheating daily hot water, thus reducing the power consumption for hot water heating. The outlet water temperature of daily hot water can be further satisfied and controlled through temperature sensors and electric heaters.

[0028] like Figure 1 As shown, a heat pump hot water supply system for an ocean nuclear power platform includes: an evaporator 1, a compressor 2, a condenser 3, a liquid storage tank 4, a filter 5, an expansion valve 6, a circulating hot water pump 7, an electric heater 8, a temperature sensor 9, and an electric water tank 10. Among them, the evaporator 1, the compressor 2, the condenser 3, the liquid storage tank 4, the filter 5 and the expansion valve 6 constitute a heat pump system, and the heat pump system is a refrigerant working medium circulation. The circulating hot water pump 7, the electric heater 8, the temperature sensor 9, the electric water tank 10 and the condenser 3 shared with the heat pump circulation constitute a daily hot water heating system.

[0029] When it is necessary to supply heat to the outside, under the driving pressure head provided by the circulating hot water pump 7, the daily cold water return from the user side flows through the condenser 3, and the high-temperature and high-pressure refrigerant working medium preheats the return water through the condenser 3. The preheated return water enters the electric hot water cabinet 10 through the pipeline, and can be further heated by the electric heater 8, and the temperature sensor is combined to control the water supply temperature. The low-temperature and low-pressure liquid refrigerant absorbs the heat of the cooling seawater of the steam turbine condenser and the concentrated brine of the seawater water evaporator in the steam generator 1 to become a low-pressure gaseous refrigerant, and then is compressed by the compressor 2 to become a high-temperature and high-pressure gaseous refrigerant, and then enters the condenser 3 and is condensed into a high-pressure liquid refrigerant by the daily hot water return water, and then passes through the liquid storage tank 4 and the filter 5 in turn, and finally expands through the expansion valve 6 to become a low-temperature and low-pressure liquid refrigerant, and flows through the evaporator 1 for heat exchange, thus completing a heat pump cycle.

[0030] The contents not described in detail in this specification belong to the prior art known to those skilled in the art. Although the specific embodiments of the present invention are described above, those skilled in the art should understand that this is not a limitation of the present invention, and various changes and modifications can be made without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to the scope of the present invention and should be covered by the present invention.

Claims

1. A heat pump hot water supply system for an ocean nuclear power platform, characterized in that: It includes a heat pump system and a daily hot water heating system, and the heat pump system and the daily hot water heating system exchange heat through a condenser.

2. A heat pump hot water supply system for a marine nuclear power platform as claimed in claim 1, characterized in that: The heat pump system includes an evaporator, a compressor, a condenser, a liquid storage tank, a filter and an expansion valve. One end of the evaporator is connected to the compressor, the compressor is connected to the condenser, the condenser is connected to the liquid storage tank, the liquid storage tank is connected to the filter, and the filter is connected to the other end of the evaporator through the expansion valve to form a loop.

3. A heat pump hot water supply system for a marine nuclear power platform as claimed in claim 2, characterized in that: The heat pump system is a refrigerant working medium cycle.

4. A heat pump hot water supply system for a marine nuclear power platform as claimed in claim 2, characterized in that: The input of the evaporator is the concentrated brine of the seawater steam generator and the cooling seawater at the outlet of the turbine condenser, and the output is mixed discharge.

5. The heat pump hot water supply system for an ocean nuclear power platform as claimed in claim 1, characterized in that: The daily hot water heating system comprises a circulating hot water pump, an electric heater, a temperature sensor, an electric water tank and a condenser shared with the heat pump circulation. The circulating hot water pump is connected to the condenser, the electric water tank is connected to the condenser, and the temperature sensor and the electric heater are arranged in the electric water tank.

6. A heat pump hot water supply system for a marine nuclear power platform as claimed in claim 5, characterized in that: When it is necessary to supply heat to the outside, under the driving pressure head provided by the circulating hot water pump, the daily cold water return from the user side flows through the condenser, and the high-temperature and high-pressure refrigerant preheats the return water through the condenser. The preheated return water enters the electric water tank through the pipeline, is further heated by the electric heater, and is combined with the temperature sensor to control the water supply temperature.

7. A heat pump hot water supply system for an ocean nuclear power platform as claimed in claim 2, characterized in that: The low-temperature and low-pressure liquid refrigerant absorbs the heat of the cooling seawater of the turbine condenser and the concentrated brine of the seawater water evaporator in the steam generator to become a low-pressure gaseous refrigerant. It is then compressed by the compressor to become a high-temperature and high-pressure gaseous refrigerant. It then enters the condenser and is condensed into a high-pressure liquid refrigerant by the daily hot water return water. It then passes through the liquid storage tank and filter in turn, and finally expands through the expansion valve to become a low-temperature and low-pressure liquid refrigerant. It flows through the evaporator for heat exchange, thus completing a heat pump cycle.

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