JP2000338278A - Nuclear cogeneration plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply wide energy with high thermal efficiency by installing a nuclear generation system and a mixed medium cycle generation system underground and taking in seawater for cooling via an artificial island or the like being installed on the sea. SOLUTION: In the nuclear cogeneration plant, deep-layer cooling seawater intake piping 79 for pumping deep-layer cooling seawater 40 from an artificial island 76 or the like for joining to a nuclear generation plant 1, an underground tunnel 77 to a mixed medium system 6, and an underground tunnel 48. The mixed medium system 6 is attached to the plant 1 for performing generation and manufacturing chill, and an artificial lake 84 is provided at the upper portion of the plant 1. Then, ice is manufactured from deep-layer cooling seawater by nighttime nuclear energy and is stored at the artificial lake 84, stored water is thawed for daytime peak power consumption for cooling the turbine exhaust of mixed medium cycle generation and for improving thermal efficiency, and thawing water is supplied, for example, as fresh water. Crane facilities or the like are provided at the artificial island 76 for carrying various kinds of machinery and materials.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nuclear power generation system in which a nuclear power generation system provided with a mixed medium cycle power generation system is installed underground to supply electric power and cooling / heating heat to various facilities.

[0002]

2. Description of the Related Art With economic development in recent years, power demand has been supported by personal consumption such as enlargement of home appliances and spread of air conditioning, and both industrial and consumer use have been steadily increasing.

[0003] Of these power demands, there are many that are converted into cold heat and used for cooling. Currently, as a power generation method with high thermal efficiency, the gas turbine is driven by high-temperature and high-pressure combustion gas obtained by burning natural gas, and at the same time, steam is generated by the high-temperature gas discharged from the gas turbine,
A combined cycle power generation for driving a steam turbine is known, and its thermal efficiency is 40 to 50%.

On the other hand, turbine bleeding is performed, steam or hot water is produced by a heat exchanger, and 30 k
2. Description of the Related Art There is known a cogeneration technology for transporting a distance of about m to supply heat and generate power at the same time. When this cogeneration is adopted, the thermal efficiency becomes 60 to 80%. In this case, since electric energy and heat energy are used as a method of using energy, if cogeneration is employed, the amount of heat exhausted to the global environment can be reduced.

[0005] Since there is a great demand for cooling in the use of heat in Japan, a method of obtaining cold heat using hot water or steam generated by an absorption refrigerator is generally adopted. For example, a heavy oil-burning Hainan power plant at Wakayama Marina City supplies 30 t / h of steam obtained by heat exchange with steam extracted from a 600,000 kW turbine, and generates cold and steam generated by an absorption refrigerator. Is supplied to hotels, houses, sports facilities, etc.

For example, when turbine extraction is performed at a 1.1 million kW class boiling water nuclear power plant to utilize heat, a power generation output (776 MWe) and a heat output (1245 MW) are used.
With Wt), the total thermal efficiency can be reduced to about 61.4%, and the heat utilization efficiency can be greatly improved compared to 33.4% when only power generation is performed.

Conventionally, Japanese Patent Application Laid-Open No. 9-209716 describes
As described in Japanese Patent Publication No. Hei 4-27367, a steam turbine driven by steam generated by a heat source, a condenser for condensing exhaust gas from the steam turbine, and a condenser formed by a condenser. A steam system having condensed water transport means for transporting the condensed water to a heat source, a heat exchange means for exchanging heat between the exhaust gas from the steam turbine and the mixed medium, and a mixed medium heated by the heat exchange means. Separating means for separating into liquid and gas, a mixed medium turbine driven by the gaseous mixed medium separated by the separating means, and a liquid mixed medium separated by the separating means and the exhaust gas from the mixed medium turbine. A water / ammonia mixed medium cycle having a mixing means for mixing, a condensate means for condensing the mixed mixed medium, and a condensate transport means for transporting the condensate generated by the condensate means to the heat exchange means is combined. High fever Power generation plant of the rate is known.

In this mixed medium cycle, the mixed medium turbine is attached to the refrigerant producing section of the absorption refrigerator to generate electric power. Therefore, the refrigerant producing section is also provided so that the refrigerant can be produced while generating electric power. A possible system.

On the other hand, mixed media having different concentration differences are produced,
Akizawa et al. Have proposed a room temperature heat transport method in which this is transported over long distances to obtain cold and warm heat (Academic Lecture Papers of the Japan Refrigeration Association in 1996 (8 / 11-13,14,15,
Fukuoka); see B20, “Normal temperature heat transport by solution transport type absorption refrigerator”).

Most of the power plants in Japan are located on the coast, and large cities are also located on the coast. When electricity and heat are transported from this power plant to consumption areas in large cities, electric power is transmitted at a high voltage by constructing steel towers. For heat transport, pipelines are buried underground to transport hot water or steam. However, these methods, especially the method of burying a pipeline underground, have many problems in terms of securing land and laying costs.

On the other hand, recently, the development of underwater tunnel technology (Attachment 2) has been advanced. With this technology, the means to transport electricity and heat from power plants to big cities,
It can be secured in a short construction period.

Further, in order to effectively use the site of the nuclear power plant site, the reactor system and the turbine system are vertically arranged in a cylindrical building to improve earthquake resistance and safety in an emergency. It has also been proposed to install the entire device buried in the ground (Japanese Patent Laid-Open No. 6-258482).

[0013] It is known that, for example, in the sea off Kochi, when the water depth reaches about 300 m, deep cold water of about 7 ° C is formed. This cold water is a eutrophic salt suitable for the production of phytoplankton. In addition, the Kuroshio flowing near Japan has a warm water temperature and high salinity,
The nutrient situation is oligotrophic. Therefore, it is said that the use of deep cold seawater is effective in cultivating fish and shellfish in the sea area affected by the Kuroshio Current.

[0014]

The nuclear power plant is characterized in that the construction cost is high but the fuel cost is low as compared with the fossil fuel-fired power plant, and the power generation system as a whole is low in power generation cost. However, the location of this nuclear power plant is far from large cities, making it difficult to carry out heat transport. Further, since the amount of steam that can be used for turbine extraction in a nuclear power plant is enormous, it is necessary to efficiently transport this thermal energy.

By applying a cogeneration plant, it is possible to improve thermal efficiency. However, there is a large difference between daytime and nighttime heat and power demands. Needs to meet peak demand. Therefore, it is necessary to secure a place to install storage facilities at the site of the nuclear power plant.

The present invention has been made in view of such circumstances, and simultaneously uses a nuclear power generation system and a mixed-medium cycle power generation system while effectively utilizing sea areas and seawater to widely supply energy with high thermal efficiency. The purpose is to provide a nuclear cogeneration plant that can be used.

[0017]

According to the first aspect of the present invention, a nuclear power generation system and a mixed medium cycle power generation system are installed underground on land, and cooling seawater used for these systems is provided. And a nuclear cogeneration plant characterized in that the loading and unloading of various equipment is performed via an artificial island, an underwater tunnel and an underground tunnel installed on the sea.

According to a second aspect of the present invention, there is provided a nuclear cogeneration plant according to the first aspect, wherein an artificial lake is provided above the nuclear power generation system and the mixed medium cycle power generation system.

According to a third aspect of the present invention, in the nuclear power cogeneration plant according to the second aspect, an absorption refrigeration system is attached to the mixed medium cycle power generation system, ice is produced at night and stored in an artificial lake, and stored at daytime. A nuclear cogeneration plant, characterized in that ice is thawed to cool turbine exhaust of the mixed medium cycle power generation system.

According to a fourth aspect of the present invention, in the nuclear power cogeneration plant according to the third aspect, ice is produced using seawater, and the water obtained by thawing and cooling the turbine exhaust of the mixed medium cycle power generation system is used as fresh water. A nuclear cogeneration plant is provided.

According to a fifth aspect of the present invention, in the nuclear power cogeneration plant according to the first aspect, an absorption refrigeration system is added to the mixed medium cycle power generation system, and the sludge transported by ship from the sewage treatment plant to the artificial island is converted into an artificial refuse. A nuclear cogeneration plant characterized in that it is carried into the absorption refrigeration system via an island, an underwater tunnel and an underground tunnel, is frozen and concentrated and converted into recycled material, and then is again carried out via an artificial island. provide.

According to a sixth aspect of the present invention, in the nuclear power cogeneration plant according to the first aspect, the mixed medium cycle power generation system is provided with a concentration difference energy generation system, and the sewage treatment plant is connected to the sewage treatment plant via the underground tunnel and the underwater tunnel. While transporting high or low concentration mixed media to the center,
Form a heat cycle to receive a medium concentration of the mixed medium, generate a refrigerant in the sewage treatment plant and freeze-concentrate the sludge to perform dehydration, and produce and store ice in the heat supply center and produce and store ice. A nuclear cogeneration plant characterized by forming a cooling heat cycle between office buildings or the like as an ice slurry, or forming a heat cycle for heating between office buildings or house cultivation farms by generating hot water. I will provide a.

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

In the nuclear power cogeneration plant according to the following embodiment, a reactor building structure and a turbine building structure are constructed on a caisson structure and buried underground, and an underground ice storage tank structure is built on both buildings. And a nuclear power plant with a roof on top of it, which separates the concentration of the mixed medium with turbine bleed steam to generate power and produce cold power. Then, ice is produced from deep cold seawater with nuclear energy at night and stored, and ice is stored in response to peak power demand during the day to cool the turbine exhaust of mixed media cycle power generation to improve thermal efficiency and load. In response to leveling, thawing water used for cooling turbine exhaust is supplied as fresh water.

FIG. 1 shows the concept of laying pipes for taking in deep cold seawater into an underground nuclear power plant and laying pipes for transporting concentration difference energy. FIG. 2 shows details of the artificial island part in FIG. Is shown.

As shown in these figures, an artificial island 76 having neutral buoyancy is fixed to the seabed 80 with a cable 41, and a deep cold seawater intake pipe for pumping the deep cold seawater 40 of about 7 ° C. from the artificial island 76. 79 required water depth (approximately 3
00m). Then, an underwater tunnel 77 is laid from the artificial island 76 to the nuclear power plant 1 and the mixed medium system 6 at a depth (about 20 m) at which sunlight can penetrate, and is joined to the underground tunnel 48 from a point where it reaches the land. Configuration. In the underwater tunnel 77 and the underground tunnel 48, pipes such as a pipe for transporting deep cold seawater 40, a pipe for transporting freeze-concentrated seawater, and a pipe for mixed medium liquid having different concentrations are provided, and transport of nuclear fuel and related equipment. Transport device 11 and a passage therefor.
The nuclear power plant 1 is provided with a mixed medium system 6, and an artificial lake 84 is provided above the plant.

On the other hand, the artificial island 76 is provided with a crane facility for handling nuclear fuel and related equipment carried by ship. At the depth of the underwater tunnel 77, an artificial seabed 78 having neutral buoyancy is installed around the underwater tunnel 77.
Inside the underwater tunnel 77, a deep cold seawater intake pipe 43 and a discharge pipe 44 are provided, and an outlet of the discharge pipe is opened in an upper part of the artificial seabed 78 to discharge the eutrophic salt seawater 82.

The artificial island 76 includes the offshore structure 51, the underwater structure 47, the vertical pipe 45, and the like. The undersea structure 47 and the foundation structure 46 fixed to the seabed 80 are connected by a vertical pipe 45. An underwater tunnel 77 connects the underwater structure 47 and a condenser or the like of the mixed medium system 6 described below. At the depth position of the underwater tunnel 77, a neutral buoyancy artificial seabed 78 is fixed to the seabed 80 by the cable 41.

A pump facility 42 is installed in the underwater structure 47, and the deep cold seawater 40 is condensed with a condensate 57 (described later) of the mixed medium system 6 through an intake pipe 43 installed inside an underwater tunnel 77. 7), ice production system 35
(See FIG. 8).

The seawater returned from the condenser 57 and the seawater concentrated in the ice production system 35 are supplied to the underwater tunnel 77.
And discharged as eutrophic salt seawater 82 above the artificial seabed 78 of the underwater structure 47.

Inside the underwater tunnel 77, mixed medium liquid transfer pipes having different concentration differences are also installed, and the underwater tunnel is used to transport the mixed medium liquid to the heat supply center near a large city via the underwater structure 47 of the artificial island 76. The artificial island 76 is configured to perform loading / unloading to / from the mixed medium liquid transport tanker. Further, a passage 56 used by a transfer device 49 for transferring nuclear fuel and related equipment is provided.

The offshore structure 51 and the underwater structure 47 of the artificial island 76 are connected by a connecting structure 52, and an elevating device 53 is installed therein. The marine structure 51 is provided with a marine control room 54, a lifting and lowering device machine room 55, a crane facility 50, and the like. The marine structure 51 is provided with a berthing function for a transport ship, and is capable of loading and unloading nuclear fuel and related equipment.

FIG. 3 is a cross-sectional configuration diagram showing an underground load leveling-capable nuclear power plant, and FIG. 4 is a front view showing the configuration of a mixed medium system.

FIG. 5 shows a side view of FIG. 4, and FIG. 6 shows a system configuration of a thermoelectric supply load leveling nuclear cogeneration plant with a mixed medium system.

As shown in FIG. 3, a reactor building structure 11 and a turbine building structure 12 are mounted on a caisson structure 10. An ice storage tank structure 13 is installed on both of these building structures, a ground control room 14 and an ice manufacturing building 15 are installed on the ground, and a roof structure is provided on both. The ground control room 14 and the ice building 15 are connected to the reactor building 11 and the turbine building 12 by lifting equipment 17. A reactor pressure vessel 19 is installed on the pedestal 18 of the reactor building structure 11. The turbine building structure 12 includes generators 4 and 8, a steam turbine 3, a mixed medium turbine 7, a heat exchanger 28, an ejector absorber 36, a condenser 37, a high-pressure separator 29,
An intermediate pressure separator 32 and the like are provided.

The ice production building 15 has a refrigerant production system 9 (see FIGS. 7 and 8) and an ice production system 35 (see FIGS.
8) and the like, and a mixed medium transport pipe of high, low and medium concentration is connected to the mixed medium system 6 (see FIG. 7) of the turbine building structure 12. Further, deep cold seawater 40 is transported to the ice manufacturing building 15 via the underwater tunnel 77 and the underground tunnel 48. The ice storage tank 72 of the ice production system 35 is the same as the ice storage tank structure 13.

In FIG. 4, the steam turbine 3
Is exhausted to a heat exchanger 28 where it exchanges heat with the mixed medium, condenses, and flows into the circulation pump 5.

The exhaust gas of the mixed-medium turbine 7 is mixed and absorbed with the low-concentration mixed medium from the medium-pressure separator 32 by the ejector absorber 36, flows into the condenser 37, and exchanges heat with the deep cold seawater 40. Then, the liquid flows back to the pressure pump 38.

The plant shown in FIGS. 5 and 6 has an ice storage load composed of a nuclear power generation system 1, a mixed medium system 6, a refrigerant production system 9, an ice production system 35, a mixed medium turbine 7, a fresh water storage tank 75, and the like. It is a leveling nuclear power plant.

That is, the ice / slurry from the ice storage tank 72 of the ice production system 35 in FIG.
The liquid is condensed into a fresh water storage tank 75 after being guided to the heat exchange section of the liquid condenser 38 and subjected to heat exchange to be thawed to form fresh water. Other configurations of the nuclear power generation system 1, the mixed medium system 6, the refrigerant production system 9, and the ice production system 35 are the same as those in FIG.

FIG. 7 shows the mixed medium system 6 in FIG.
2 shows a detailed configuration of the refrigerant production system 9.

That is, the mixed medium system 6 includes a high-pressure separator 29, a medium-pressure separator 32, an absorber 36, a liquid condenser 37, a condenser 68 and the like. The mixed medium pressurized by the pressurizing pump 38 is heated by exchanging heat with the low-concentration mixed medium liquid of the intermediate-pressure separator 32 by the heat exchanger 33, and further heated by the condenser 28 of the nuclear power generation system 1. The mixture is heated by the exhaust gas of the steam turbine 3 and guided to the high-pressure separator 29 to be separated into a high-concentration mixed medium vapor and a low-concentrated mixed medium liquid.

The high-concentration mixed medium vapor is branched, guided to and driven by the mixed medium turbine 7, and is generated by a coaxially coupled generator 8. The remaining high-concentration mixed medium vapor that has been branched is guided to the condenser 68, where it is subjected to heat exchange with the separated mixed medium liquid pressurized by the pressurizing pump 38 and the deep cold seawater 40. The liquid is cooled and returned.

The condensed liquid is adiabatically expanded by the expansion valve 63 of the medium production system 9 to become a refrigerant, and heat exchanges in the ice production system 35 to return to the absorber 65 of the refrigerant production system 9. Then, the low-concentration mixed medium liquid generated by the high-pressure separator 29 is guided to the medium-pressure separator 32 via the pressure reducing valve 30 and separated into the high-concentration mixed medium vapor and the low-concentration mixed medium liquid. .
The high-concentration mixed-medium vapor is guided to the middle stage of the mixed-medium turbine 7 and is driven to generate electric power.

On the other hand, the low concentration mixed medium liquid is supplied to the heat exchanger 3
The heat is exchanged with the medium-concentration mixed medium liquid pressurized by the pressurizing pump 38 in 3, cooled, branched, guided to the absorber 36 through the throttle valve 34, and exhausted from the mixed medium turbine 7. The mixture is absorbed, guided to the liquid condensing device 37, exchanges heat with the deep cold seawater 40, cooled, and condensed.

The remaining low concentration mixed medium liquid separated and branched by the medium pressure separator 32 is supplied to the throttle valve 6 of the refrigerant production system 9.
6, is guided to the absorber 65, where it absorbs the high-concentration mixed medium subjected to heat exchange in the ice production system 35, is guided to the condenser 67, and exchanges heat with the deep cold seawater 40. And return to liquid.

The mixed medium liquid condensed by the condenser 67 of the refrigerant production system 9 joins with the mixed medium liquid condensed by the condenser 37 of the mixed medium system 6 and is guided to the inlet side of the pressure pump 38. Then, the mixed medium liquid pressurized by the pressurizing pump 38 is branched and heat-exchanged by the condenser 68 for heating.

The remaining portion is heated by exchanging heat with the low-concentration mixed medium liquid in the intermediate pressure separator 32 in the heat exchanger 33. These heated mixed medium liquids are separated again after being merged, and a part is guided to the medium pressure separator 32 via the pressure reducing valve 39, and the rest is guided to the condenser 28 of the nuclear power generation system 1. And heated.

The refrigerant production system 9 includes an expansion valve 63, an absorber 65, a throttle valve 66, a condenser 67, and the like. The high-concentration mixed medium condensed in the condenser 68 of the mixed medium system 6 is adiabatically expanded by the expansion valve 63 to become a refrigerant, heat-exchanged in the ice production system 35 to be heated to become a vapor, and supplied to the absorber 65. It is guided and exchanges heat with the deep cold seawater 40 to be cooled and returned. This condensed liquid is guided to the inlet side of the pressure pump 38 of the mixed medium system 6.

FIG. 8 shows the refrigerant production system 9 in FIG.
2 shows a detailed configuration of the ice production system 35.

The ice production system 35 includes a subcooler 70, a subcooling release tank 71, an ice storage tank 72, and the like. The deep cold seawater 40 is led to the supercooler 70, exchanges heat with the refrigerant generated by the adiabatic expansion by the expansion valve 63 of the refrigerant production system 9, enters a supercooled state, and is guided to the supercool release tank 71, Separates into ice and seawater with high salinity.

The ice and fresh water floating on the upper part of the supercooling release tank 71 are led to the heat exchange section of the condenser 37 of the mixed medium system 6, where they undergo heat exchange and are led to the fresh water storage tank 75.
The high-salinity seawater below the ice in the supercooling release tank 71 is guided to the heat exchange section of the condenser 67 of the refrigerant production system 9 by the pump 74 and exchanges heat with the mixed medium from the absorber 65. The temperature is raised to about the seawater temperature and released to the discharge sea surface area above the artificial seabed 78.

Next, the operation will be described.

The coolant made of light water is heated in the nuclear reactor 2 to become saturated steam, and this steam is sent to the steam turbine 3 via the main steam pipe. The steam sent to the steam turbine 3 drives the steam turbine 3, and the rotation energy of the turbine is converted into electric energy in the generator 4 to generate power. The exhaust gas from the steam turbine 3 is guided to the condenser 28, and performs heat exchange with the mixed medium sent from the mixed medium system 6 to be condensed.
It flows into the inlet side of the circulation pump 5 and is returned to the reactor 3.

In the daytime when power demand is high, the high-concentration mixed-medium vapor separated by the high-pressure separator 29 of the mixed-medium system 6 is not divided into the condenser 68 but is entirely supplied to the mixed-medium turbine 7 to generate electric power. I do. Exhaust gas from the mixed medium turbine 7 is converted into deep cold seawater (about 7.5
℃) 40 and the ice stored in the ice production system 35 in the form of a water slurry are flowed into the heat exchange section of the liquid condensing device 37 to perform heat exchange to obtain a medium-concentration mixed medium condensate. . The mixed medium liquid cooled by the heat exchanger 33 with the low-concentration mixed medium liquid in the intermediate-pressure separator 32 is guided to the absorber 65 without branching to the refrigerant production system 9. The medium-concentration mixed-medium liquid flowing out of the pressure pump 38 of the mixed-medium system 6 is not divided for cooling the condenser 68.

In a 1.1 million kW-class nuclear power plant, the cooling of the exhaust gas of the mixed-medium turbine 7 of the mixed-medium system is performed by cooling the seawater surface temperature to 20 ° C. and the deep cold seawater temperature to 7.5.
C. by using deep-sea cold seawater and 7.5.degree. C. to 0.degree.
A power generation of 65 KW can be performed for 7 hours. About 230,000 tons of fresh water can be obtained from seawater from ice that has been thawed at this time.

During nighttime when power demand is small, the high-concentration mixed-medium vapor separated by the high-pressure separator 29 of the mixed-medium system 6 is diverted to the condenser 68, and the mixed medium discharged from the high-pressure pump 38 by the condenser 68. Is subjected to heat exchange between the part of the mixture and the deep cold seawater 40 to return the mixed medium. The condensed liquid is adiabatically expanded by the expansion valve 63 of the refrigerant production system 9 to generate a low-temperature mixed medium refrigerant, and the mixed medium refrigerant is transported to the supercooler 70 of the ice production system 35 to perform heat exchange, and Is brought into a supercooled state, and the mixed medium liquid is heated to be a vapor and guided to the absorber 65.

In the absorber 65, a part of the low-concentration mixed medium liquid in the intermediate-pressure separator 32 of the mixed medium system 6 is diverted, mixed and absorbed with the low-pressure mixed liquid by the throttle valve 66.
It is led to. In the condenser 67, the mixed medium is deep cold seawater 40
Then, heat exchange is performed with seawater having a high salt concentration from the supercooling release tank 71 of the ice production system 35 to cool and return the liquid. This condensed liquid is guided to the inlet side of the pressure pump 38 of the mixed medium system 6.

The deep cold seawater 40 is guided to the supercooler 70 of the ice production system 35, and a supercooled state is formed by the mixed medium refrigerant generated by adiabatic expansion by the expansion valve 63. Freshwater ice and high salinity seawater are formed.
The formed ice floats on the liquid surface of the tank due to the difference in specific gravity, and the upper part of the tank becomes freshwater ice and the lower part becomes a seawater state with a high salt concentration. From above, fresh water ice and fresh water are guided to an ice storage tank 72 for storage.
Seawater having a high salt concentration is extracted from below the subcooling release tank 71, transferred to the condenser 67 of the refrigerant production system 9 by the pump 74, and heat-exchanges with the mixed medium guided from the absorber 65, thereby obtaining high salt content. The heated seawater of the concentration is transported to the artificial island 76 by the discharge pipe 135 and discharged to the sea area above the artificial seabed 78.

In a 1.1 million KW-class nuclear power plant, about 13% of the high-concentration mixed medium vapor generated by the mixed medium system is used for 10 hours to produce a mixed medium refrigerant, and about 230,000 tons of ice is produced. Manufacture and store.

The effects based on the above configuration and operation are described below.

Installing a mixed media system and a mixed media turbine in a bottoming cycle of a nuclear power plant,
By using deep cold seawater for cooling the condenser in the mixed medium cycle, it is possible to improve the thermal efficiency of the nuclear power plant and reduce the amount of heat exhausted to the environment.

Further, by adding a refrigerant production system and an ice production system that share a part of the system of the mixed medium cycle, ice is produced using heat energy and electric energy of nuclear energy at night, and the ice is produced and stored. Slurry of ice stored during daytime power demands can be used as a slurry to cool the condenser of the mixed media system, thereby improving the thermal efficiency of the nuclear power plant and reducing peak daytime power demand. It is possible to provide a load leveling nuclear power plant.

Since a nuclear power plant has a lower operating cost than other power generation methods, it is difficult to operate at a rated output.
It is advantageous for energy saving, and since the fossil fuel power plant has been able to respond to the peak power load with nuclear energy, it is possible to provide a power generation method that does not emit carbon dioxide gas. Therefore, it can contribute to the prevention of global warming.

In order to produce ice from seawater using night-time nuclear energy and store it to meet peak daytime power demands, this ice is used to cool the condenser of the mixed media cycle to increase power generation efficiency. The wastewater used for improvement can be used as freshwater. By producing ice from seawater using nuclear energy, the dual purpose of desalination of seawater and load leveling of a nuclear power plant can be achieved.

A condenser for condensing the high-concentration mixed-medium vapor is installed in the mixed-medium system, and the mixed-medium vapor evaporated and heat-exchanged by the supercooler of the ice-making system in the refrigerant production system is mixed with the low-concentration mixed-medium liquid. Even if the distance between the mixed medium system and the installation location of the refrigerant production system is increased by installing a liquid condensing unit that absorbs and condenses the liquid, by transporting the mixed medium during this time in a liquid state Energy and equipment required for transportation can be reduced.

By using the deep cold seawater to cool the condenser of the mixed medium system, the power generation efficiency of the nuclear power plant can be improved, and at the same time, the deep cold seawater is eutrophic salt seawater. Marine aquaculture can be carried out by discharging used seawater into the sea area above the neutral buoyancy artificial seabed installed at the critical depth where sunlight can pass.

An artificial island is provided for taking in deep cold seawater,
By providing an underwater tunnel and artificial seabed at the critical depth where sunlight can pass between the nuclear plant and the artificial island, the underwater tunnel can also be used as a passage to the artificial island and used as a marine park centered on the artificial island Will be able to
It will be able to provide leisure facilities centered on nuclear power plants and provide fish farming facilities.

By making the nuclear power plant an underground type and providing an ice storage tank structure thereon, the site of the nuclear power generation site can be effectively used, and at the same time, load leveling can be performed and thermal efficiency can be improved. In addition, ice-thawed water produced from seawater used for the condenser can be used as fresh water. Concentrated seawater can be used as an industrial raw material.

[0070]

As described above, according to the present invention, the nuclear power generation system and the mixed medium cycle power generation system can be used at the same time and the sea area and seawater can be effectively used to provide a wide range of energy supply with high thermal efficiency. A cogeneration plant can be provided.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram illustrating an arrangement of a seawater intake pipe and a heat transport pipe, showing an embodiment of a nuclear cogeneration plant according to the present invention.

FIG. 2 is a conceptual diagram showing an artificial island in the embodiment.

FIG. 3 is a sectional view showing an underground load leveling-compatible nuclear power plant according to the embodiment.

FIG. 4 is a front view showing the arrangement of the mixed medium system in the embodiment.

FIG. 5 is a side view showing the arrangement of the mixed medium system in the embodiment.

FIG. 6 is a system configuration diagram showing a thermoelectric supply load leveling nuclear cogeneration plant with a mixed medium system according to the embodiment.

FIG. 7 is a configuration diagram showing a thermoelectric supply mixed medium system in the embodiment.

FIG. 8 is a configuration diagram showing a seawater desalination system by a freezing method in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nuclear power plant 2 Nuclear reactor 3 Steam turbine 4 Generator 5 Circulation pump 6 Mixing medium system 7 Mixing medium turbine 8 Generator 9 Refrigerant manufacturing system 10 Caisson structure 11 Reactor building structure 12 Turbine building structure 13 Ice storage tank structure 14 Ground Control building 15 Ice manufacturing building 16 Roof structure 17 Elevating equipment 18 Pedestal 19 Reactor pressure vessel 28 Heat exchanger 29 High pressure separator 30 Pressure reducing valve 31 Mixer 32 Medium pressure separator 33 Heat exchanger 34 Throttle valve 35 Ice manufacturing system 36 Absorber 37 Condenser 38 Pressure pump 39 Pressure reducing valve 40 Deep seawater 41 Cable 42 Pump device 43 Intake pipe 44 Discharge pipe 45 Vertical pipe 46 Foundation structure 47 Underwater structure 48 Underground tunnel 49 Transport device 50 Crane equipment 51 Offshore Structure 52 Communication structure 53 Apparatus 54 Marine control room 55 Elevating machine room 56 Passage 63 Expansion valve 65 Absorber 66 Throttle valve 67 Condenser 68 Condenser 70 Subcooler 71 Subcooling release tank 72 Ice storage tank 73 Pump 74 Pump 75 Freshwater storage tank 76 Artificial island 77 Underwater tunnel 78 Artificial seabed 79 Deep cold seawater intake piping 80 Seabed 81 Sea level 82 Eutrophic salt seawater 83 Sea level 84 Artificial lake

Claims (6)

[Claims] 1. A nuclear power generation system and a mixed media cycle power generation system are installed underground on land, and seawater for cooling and various equipment used for these systems are carried in and out.
A nuclear cogeneration plant characterized by being carried out via an artificial island, underwater tunnel and underground tunnel installed at sea. 2. The nuclear cogeneration plant according to claim 1, wherein an artificial lake is provided above the nuclear power generation system and the mixed medium cycle power generation system. 3. The nuclear cogeneration plant according to claim 2, further comprising an absorption refrigeration system attached to the mixed medium cycle power generation system, producing ice at night, storing the ice in an artificial lake, and thawing the stored ice during the day. A nuclear cogeneration plant wherein the turbine exhaust of the mixed medium cycle power generation system is cooled. 4. The nuclear cogeneration plant according to claim 3, wherein ice is produced using seawater, the water is thawed, and water cooled by turbine exhaust of the mixed medium cycle power generation system is used as fresh water. Nuclear cogeneration plant. 5. The nuclear cogeneration plant according to claim 1, further comprising an absorption refrigeration system attached to the mixed-medium cycle power generation system, wherein the sludge transported by ship from the sewage treatment plant to the artificial island is supplied to the artificial island, the underwater tunnel and the underwater tunnel. A nuclear cogeneration plant, which is carried into the absorption refrigeration system via an underground tunnel, frozen and concentrated to be converted into recycled material, and then carried out again via an artificial island. 6. The nuclear cogeneration plant according to claim 1, further comprising a mixed energy cycle power generation system provided with a concentration difference energy generation system, and a high-density energy generation system connected to a sewage treatment plant and a heat supply center via an underground tunnel or an underwater tunnel. While conveying the mixed medium of low concentration, form a thermal cycle to receive the mixed medium of medium concentration, in the sewage treatment plant to generate a refrigerant and perform dehydration by freezing and condensing sludge,
The heat supply center produces a refrigerant and produces and stores ice, forms a cooling heat cycle between office buildings and the like as an ice slurry, or generates hot water to produce an office building or a house cultivation farm and the like. A nuclear cogeneration plant characterized by forming a heat cycle for heating at the plant.