JP2000120404A - Combined power generating plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress discharge of carbon dioxide by using electric power and thermal energy of nuclear power generation during night to produce and reserve fuel for peak power generating fuel in the daytime, and by burning this fuel for power generation in the daytime. SOLUTION: A mixed medium power generator 30 is connected to a nuclear power generating system 1. The system 1 is connected on an exhaust gas side of a steam turbine 5 thereof to a suction type refrigerator 2. The refrigerator 2 is connected to a low-temperature type liquefying device 21. The liquefying device 21 is connected to a storage cryogenic converter 4. The converter 4 is connected to a combustor 11 of a methanol gas turbine combined power generating system 26. During a peak demand for power generation in the daytime, reserved methanol, oxygen and carbon dioxide generate combustion gas to drive a gas turbine 12. The resultant waste heat generates steam, thereby driving a steam turbine 14. The waste heat of the steam turbine 14 generates ammonia vapor for a mixed liquid cycle to drive a mixed medium turbine, thereby achieving power generation in accordance with the peak demand for power. Carbon dioxide generated by methanol combustion is liquefied to be reserved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combined power generation system configured so that nighttime power and daytime power can be leveled.

[0002]

2. Description of the Related Art In recent years, economic development has been supported by personal consumption such as the enlargement of home appliances and the spread of air conditioning, and the demand for electric power has been steadily increasing for both industrial and consumer use. . The maximum power is increasing year by year, but the annual load factor tends to decrease. Since the growth of the maximum power is remarkable and exceeds the growth of the electric energy, the power demand peaks, and the demand difference between the season and the day and night is increasing. For example, it is said that the difference between day and night power demands of the largest electric power companies in Japan has reached a minimum value of 57% of the maximum value.

[0003] As means for improving the supply side in order to improve the load factor, pumped power generation and power storage techniques such as superconductivity, flywheel, and air compression are known. Pumped storage power generation has problems such as the fact that it must be located in a remote location, the location is limited, and the construction period is long.

[0004] The superconducting and flywheel power storage methods are under development, but it is difficult to manufacture or install large capacity power storage facilities. A method of storing electric power using air compression in the seabed or underground space is being studied, but the scale of storage will be very large.

[0005] Therefore, liquid air is produced by midnight electric power, stored in the form of cold heat, and the peak demand in the daytime is responded by pressurizing the liquid air and supplying it to the combustor of the gas turbine generator to respond to the demand of the compressor. A technique for reducing the power and increasing the output at the transmitting end has been disclosed (see Japanese Patent Application Laid-Open No. 9-250360). It is said that this method can achieve about 70% energy storage efficiency, which is comparable to pumped storage power generation.

Further, cascading use of heat in a low-temperature region in which liquid air is produced by midnight power and stored in the form of cold heat, and the liquid air is pressurized and sequentially heated to the atmospheric temperature during peak demand in the daytime. A patent application was filed to supply high-pressure air to the gas turbine generator combustor using a room temperature superconducting system, freezer, ice heat storage, etc. to reduce the power for the air compressor and increase the power output at the transmission end. (Japanese Patent Laid-Open No. 9-13918)
Reference).

[0007] A patent application has been filed in which seawater is frozen using late-night electric power as ice cold storage, stored in ice, and deicing cold heat is supplied to a district heat supply to simultaneously perform load leveling and fresh water production (Japanese Patent Laid-Open No. Hei 10 (1999)). 9-85232). As another cold storage method, a technology is disclosed in which power is stored in low-temperature ammonia or carbon dioxide using late-night electric power and heated during the daytime peak demand by heating with the exhaust of a steam turbine to drive an expansion turbine to generate power. (JP-A-6-272517).

An example of a method for producing liquid oxygen and liquid nitrogen liquid air using a double rectification column having a low pressure rectification column operating under low pressure and a medium pressure rectification column operating at medium pressure A technique with improved energy efficiency has been disclosed (see JP-A-6-249574).

[0009] A steam turbine driven by steam generated by the heat source, a condenser for condensing exhaust gas from the steam turbine, and a condensate transportation means for transporting the condensate generated by the condenser to the heat source. A steam system having, heat exchange means for performing heat exchange between the exhaust gas from the steam turbine and the mixed medium, separation means for separating the mixed medium heated by the heat exchange means into liquid and gas, and separation means. A mixed medium turbine driven by the separated gaseous mixed medium, a mixing means for mixing the exhaust gas from the mixed medium turbine and the liquid mixed medium separated by the separating means, and condensing the mixed mixed medium A technology relating to a high thermal efficiency power plant that combines a water and ammonia mixed medium cycle having a liquid condensing means and a liquid condensing means for conveying the liquid condensate generated by the liquid condensing means to a heat exchange means has been disclosed. (JP-A-9-209716, JP-see Japanese Patent Kokoku 4 27367).

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

[0011] Even in the sea near the equator, when the water depth reaches about 600 m, it becomes deep cold water of about 7 ° C, and this cold water is a eutrophic salt suitable for the production of phytoplankton. The Kuroshio flowing in the waters around Japan has a warm water temperature and high salinity, but nutrients are 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.

[0012]

The power load is approximately 40 days and nights.
It is said to fluctuate by nearly%. Nuclear power plants have the feature that construction costs are higher than fossil fuel-fired power plants, but fuel costs are lower.Since it is the lowest power generation system in total, continuous operation at rated output is possible. Doing so is operationally advantageous. Therefore, conventionally, a fossil fuel-fired power generation plant is started to respond to a load fluctuation by responding to the peak power demand during the daytime.

However, it is necessary to reduce the amount of carbon dioxide emission in order to prevent global warming, and it is necessary to reduce the use of fossil fuel-fired power plants to meet the peak load of daytime power demand. There are issues that have not been reached.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and uses methanol and hydrogen by using electricity and heat by using electric power and heat during a time period when power demand is small, such as at night. Combined, when peak power demand occurs in the daytime, it is handled by methanol gas turbine power generation that performs methanol oxyfuel combustion using carbon dioxide as an inert gas, and all generated carbon dioxide and pure water are collected and stored. To provide a combined power plant that can be used for methanol synthesis and water electrolysis, respectively, without generating carbon dioxide gas outside the power plant, suppressing generation thereof, and leveling the load of electric power. .

[0015]

According to the first aspect of the present invention, there is provided a nuclear power generation system for driving a generator by rotating a steam turbine with steam generated in a nuclear reactor, and an exhaust gas side of the steam turbine of the nuclear power generation system. A refrigeration unit connected to the absorption refrigeration unit, a cryogenic liquefier connected to the absorption refrigeration unit, a storage refrigeration unit connected to the refrigeration unit, and a combustor connected to the storage refrigeration unit And a methanol synthesizing system including a water electrolysis device connected to the cryogenic liquefaction device and a methanol synthesizer connected to the storage cooling and heat conversion device. .

According to a second aspect of the present invention, a mixed-medium power generation system including a mixed-medium device, a mixed-medium turbine, and a generator is provided between the nuclear power generation system and the absorption refrigeration system,
An inlet side of a reflux pipe of the mixed medium device is connected to a final exhaust pipe of the steam turbine, and an outlet side of the reflux pipe is connected to an inlet side of a circulation pump of the nuclear reactor. .

According to a third aspect of the present invention, the mixed medium power generation system comprises a water and ammonia mixed medium power generation system. The invention of claim 4 is characterized in that a refrigerant production system is provided instead of the absorption refrigeration apparatus.

A fifth aspect of the present invention is characterized in that water, an ammonia-based refrigerant, and an alcohol-based refrigerant are used in the absorption refrigeration apparatus. According to the invention of claim 6, the exhaust gas from the waste heat boiler of the methanol gas turbine combined power generation system is guided to the cryogenic liquefier, separated into liquid carbon dioxide gas and pure water, stored, and electrolyzed pure water. Produce hydrogen and oxygen, oxygen is led to the cryogenic liquefaction apparatus and stored as liquid oxygen, and hydrogen is used to produce and store methanol using a catalyst with the stored carbon dioxide gas, Stored methanol,
It is characterized in that power is generated by driving a gas turbine with combustion gas generated by pressurizing and evaporating and burning liquid oxygen and liquid carbon dioxide gas.

The invention of claim 7 is characterized in that deep mixed seawater is used for cooling the mixed medium device of the mixed medium power generation system or the liquid condensing part of the condenser. The invention of claim 8 is
A second mixed-medium power generation system including a second mixed-medium device, a mixed-medium turbine, and a generator connected to the waste heat boiler and the steam turbine of the methanol-gas turbine combined power generation system is provided.

According to a ninth aspect of the present invention, the exhaust pipe of the steam turbine of the methanol gas turbine combined power generation system is connected to the mixed medium device, and an outlet pipe of the mixed medium device is branched to form the methanol gas turbine combined power generation system. Characterized in that it is connected to a waste heat boiler.

According to a tenth aspect of the present invention, there is provided a nuclear power generation system for driving a generator by rotating a steam turbine with steam generated in a nuclear reactor, a mixed medium device connected to an exhaust pipe of the steam turbine of the nuclear power generation system, A mixed-medium power generation system including a mixed-medium turbine and a generator, and an absorption refrigeration device connected to an extraction pipe that extracts air from the middle stage of the steam turbine,
It is characterized by comprising an absorption type refrigeration unit and an ammonia refrigerant storage tank connected to the mixed medium unit by piping.

According to the first aspect of the present invention, in a nuclear power generation site, in order to equalize nighttime power and daytime power, a low-temperature medium is absorbed and refrigerated by excess power energy or heat energy at night or on holidays. The cryogenic liquefaction apparatus produces liquid air and separates it to produce and separate liquid oxygen and nitrogen, which is used to remove heat generated by the compressor.

When peak power is generated in the daytime, the turbine efficiency is improved by using the cooled deep seawater of the condenser of the nuclear power generation system. Further, methanol, liquid oxygen and carbon dioxide are pressurized and vaporized and supplied to the combustor of the methanol gas turbine combined cycle system to cause oxygen combustion in a carbon dioxide gas atmosphere. A gas turbine is rotated by a combustion gas composed of carbon dioxide and steam to generate power. This allows
It can respond to peak power demand.

According to the second aspect of the present invention, by connecting the mixed-medium power generation system to the nuclear power generation system, heat recovery at lower temperatures can be improved, and power generation efficiency can be improved.

According to the third aspect of the present invention, a combined power generation system having a mixed-medium power generation system that is inexpensive and has no environmental problems can be realized by using the mixed-medium power generation system as a mixed-medium power generation system of water and ammonia.

According to the fourth aspect of the present invention, by providing a refrigerant production system in place of the absorption refrigeration system, the dual purpose of refrigerant production and power generation can be easily achieved, and construction costs can be reduced. .

According to the fifth aspect of the present invention, the use of water, an ammonia-based refrigerant, or an alcohol-based refrigerant in the absorption refrigeration apparatus makes it possible to obtain a refrigerant having a temperature of zero degrees or less.
The thermal efficiency of the O ₂ and O ₂ liquefaction apparatus can be increased.

According to the sixth aspect of the present invention, it is possible to improve the power generation efficiency and achieve load leveling with little waste heat to the environment and no emission of carbon dioxide gas. Claim 7
According to the invention, the power generation efficiency can be improved by using deep-layer cold seawater as the cooling seawater of the mixed medium device of the mixed medium power generation system or the condensing portion of the condenser.

According to the eighth aspect of the present invention, by providing the second mixed medium power generation system in the methanol gas turbine combined power generation system, it is possible to cope with daytime peak power demand with little waste heat to the environment. it can.

According to the ninth aspect of the present invention, the second mixed-medium power generation system adjacent to the nuclear power generation system can be omitted, and can be shared with the first mixed-medium power generation system adjacent to the methanol gas turbine combined power generation system.

According to the tenth aspect of the present invention, the high-concentration ammonia vapor discharged from the mixed-medium turbine is generated and stored in the mixed-medium system in the daytime when peak power demand is generated by generating and storing low-temperature ammonia refrigerant with nighttime power. Can be condensed with the stored ammonia refrigerant. As a result, the thermal efficiency of the mixed-medium turbine can be improved to meet peak power demand, and a load leveling combined cycle power plant can be provided.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a combined cycle power plant according to the present invention will be described with reference to FIGS.
In FIG. 1, reference numeral 1 denotes a nuclear power generation system, 2 denotes an absorption refrigeration system, 3 denotes a nuclear reactor, 4 denotes a storage cooling and heat conversion device, 5 denotes a steam turbine, 6 denotes a first mixed medium device, 7 denotes a mixed medium turbine, Reference numeral 8 denotes a cryogenic carbon dioxide-oxygen liquefaction apparatus.

The nuclear power generation system 1 includes a reactor 3, a main steam pipe 3
1, a steam turbine 5, a generator 32 and a circulation pump 29. In FIG. 1, reference numeral 30 denotes a first mixed-medium power generation system, which includes a first mixed-medium device 6, a steam pipe 35, a mixed-medium turbine 7, a generator 36, and a return pipe 37. The final stage steam from the steam turbine 5 is supplied to the first mixing medium device 6 through the exhaust pipe 33, and the condensate of the first mixing medium device 6 is supplied to the inlet side of the circulation pump 29 through the reflux pipe 34. You.

The medium-pressure gas extracted from the middle stage of the steam turbine 5 of the nuclear power generation system 1 is supplied to the absorption refrigeration system 2 to which the electric power 20 is supplied through the bleed pipe 39, and cooled by the refrigeration system 2 to recover the liquid. Water circulating pump through return water pipe 40
Return to entrance side of 29.

In the first mixed-medium device 6 in the first mixed-medium power generation system 30, high-concentration ammonia vapor is generated, and the ammonia vapor is supplied to the mixed-medium turbine 7 through a steam pipe 35 to drive the generator 36. To generate electricity. The ammonia vapor after driving the turbine 7 returns to the first mixed medium device 6 through the return pipe 37 and circulates. In order to return the ammonia vapor circulated to the first mixing medium device 6, the deep cold seawater 24 is supplied by the seawater supply pump 38 through the cold seawater supply pipe 41 and cooled. An outlet pipe 56 is connected to the first mixed medium device 6.

The low-temperature refrigerant generated by the absorption refrigeration system 2 is guided to a cryogenic carbon dioxide-oxygen liquefaction unit 8, which cools and compresses the carbon dioxide and oxygen compressed by the compressor of the liquefaction unit 8. The returned refrigerant returns to perform heat exchange in the evaporator of the absorption refrigeration apparatus 2.

In the refrigerated carbon dioxide / oxygen liquefaction apparatus 8 of the refrigerated CO ₂ and O ₂ liquefaction system 58, the heat generated by pressurizing carbon dioxide and oxygen is cooled, and adiabatic expansion is performed to obtain liquid oxygen and oxygen. Liquid carbon dioxide is produced and stored in the liquid oxygen storage tank 9 and the liquid carbon dioxide gas storage tank 10.

In the storage cooling / heating converter 4, the liquid oxygen and the liquid carbon dioxide from the liquid oxygen storage tank 9 and the liquid carbon dioxide gas storage tank 10 are pressurized by a pump to exchange heat with a refrigerant such as liquid propane. The vaporized high-pressure oxygen gas and carbon dioxide gas are supplied to the combustor 11 of the methanol gas turbine combined cycle system 26.

The methanol gas turbine combined cycle system 26 includes a combustor 11, a gas turbine 12, a generator 42, and a waste heat boiler 1.
3. It consists of a steam turbine 14. The carbon dioxide gas vaporized by the storage cooling / heating converter 4 is supplied to the methanol synthesizer 18 of the methanol synthesis system 57. The methanol synthesis system 57 includes a water electrolysis device 17, a methanol synthesizer 18, and a methanol storage tank 19.

The water electrolysis device 17 is supplied with cryogenic carbon dioxide gas and pure water 23 collected by the oxygen liquefaction device 8, performs electrolysis with DC-converted electric power 22, and generates oxygen using an oxygen supply pipe.
The hydrogen is sent to the cryogenic carbon dioxide-oxygen liquefier 8 through 43 and the hydrogen is sent to the methanol synthesizer 18 through the hydrogen supply pipe 44.
In the methanol synthesizer 18, the carbon dioxide supplied from the storage cooling / heating converter 4 through the carbon dioxide supply pipe 45 and the water electrolyzer
Methanol is synthesized from the hydrogen gas supplied from 17 through the hydrogen supply pipe 44 using a catalyst, and the generated methanol is stored in the methanol storage tank 19.

In FIG. 1, reference numeral 46 denotes a second mixed-medium power generation system, which is constituted by the second mixed-medium device 15, the mixed-medium turbine 16 and the generator 47. Second mixed media device
Steam from the steam turbine 14 of the methanol gas turbine combined cycle 26 is supplied to 15, and the discharge side thereof is connected to the waste heat boiler 13.

The pressurized oxygen gas and carbon dioxide gas are supplied to the combustor 11 of the methanol gas turbine combined power generation system 26 from the storage and cooling heat converter 4 through the oxygen supply pipe 48 and the carbon dioxide gas supply pipe 49. Pressurized methanol is supplied from a methanol storage tank 19 of 57 through a methanol supply pipe 50, is atomized, performs oxyfuel combustion in inert carbon dioxide gas, and the combustion gas is supplied to the gas turbine 12.

The combustion gas supplied to the gas turbine 12 is
This is driven to generate power by a generator 42 coaxially coupled. Then, the waste heat gas is discharged to the waste heat boiler 13, and after performing condensed water and heat exchange from the second mixed medium power generation system 46, is supplied to the cryogenic carbon dioxide-oxygen liquefier 8.

The condensed water is heat-exchanged in the waste heat boiler 13 to be converted into steam to be supplied to the steam turbine 14, which is driven to generate electric power by the coaxially coupled generator 42, and the exhaust gas is generated by the second mixed medium power generation. It is supplied to the mixed medium device 15 of the system 46, and performs heat exchange between the water and the ammonia mixed medium to become condensed water, and the waste heat boiler
Circulates to 13.

In the second mixed medium device 15 of the second mixed medium power generation system 46, high-concentration ammonia vapor is generated by the exhaust of the steam turbine 14 of the methanol gas turbine combined power generation system 26. 16 is driven to generate electric power by a generator 47 coaxially coupled, and the exhaust
It circulates to 15 and is cooled by deep cold seawater 24 and returned.

Next, the operation of the first embodiment of the present invention will be described. In FIG. 1, a coolant made of light water is heated in a nuclear reactor 3 to become saturated steam, and this steam is sent to a steam turbine 5 via a main steam pipe 31. The steam sent to the steam turbine 5 is
, And the rotational energy of the turbine 5 is converted into electric energy in the generator 32 to generate electric power. Exhaust gas from the steam turbine 5 is sent to the first mixed medium device 6 via the exhaust pipe 33, performs heat exchange, becomes condensed water, flows into the inlet side of the circulation pump 29, and is returned to the nuclear reactor 3. You.

In the daytime when power demand is high, no air is extracted from the middle stage of the steam turbine 5, and the steam turbine 5
The entire amount of the exhaust gas exchanges heat with the mixed medium of water and ammonia in the heat exchange section of the heater (not shown) in the first mixed medium device 6, passes through the reflux pipe 34, and the circulation pump of the nuclear power generation system 1
Recirculate to the entrance side of 29.

The mixed medium of water and ammonia heated by the heater in the first mixed medium device 6 is separated by a separator (not shown).
In the process, a high ammonia concentration vapor and a low ammonia concentration solution are separated.
The steam having a high ammonia concentration is supplied to the mixed medium turbine 7 through a steam pipe 35, and is driven to rotate a generator 36 connected coaxially to generate power.

The exhaust gas of the mixed-medium turbine 7 returns to the first mixed-medium device 6 through an exhaust pipe 37, is mixed and absorbed by the previously separated solution having a low ammonia concentration, and is cooled by a deep-water cooling system supplied by a seawater supply pump 38. It exchanges heat with cooling water such as seawater 24 (seawater at a depth of about 600 m at about 7.5 ° C) and is condensed to return to liquid. The condensed liquid is pressurized by a pump (not shown) and flows back to the heater via the heat exchanger.

During nighttime when power demand is low, bleeding is performed from the middle stage of the steam turbine 5, and heat is exchanged with the mixed medium of water and ammonia through the bleed pipe 39 in the heat exchange section of the heater of the absorption refrigeration system 2. Go and circulating pump of nuclear power system 1
Recirculate to the entrance side of 29. The mixed medium of water and ammonia heated by the heater in the absorption refrigeration apparatus 2 is separated by the separator into a vapor having a high ammonia concentration and a solution having a low ammonia concentration.

The separated steam having a high ammonia concentration is separated by a condenser into deep cold seawater 24 (about 7.0 m in seawater having a depth of about 600 m).
It condenses by exchanging heat with cooling water such as 5 ° C), and the condensate flows into the cooler through the expansion valve. When passing through the expansion valve, the refrigerant becomes a low-temperature refrigerant by adiabatic expansion.

The refrigerant of the cooler in the absorption refrigeration system 2 cools the medium of the cooling cycle for performing heat exchange of the cooler of the cryogenic carbon dioxide-oxygen liquefaction unit 8 and heats after the heat exchange. The resulting vapor is led to the absorber.

The other low ammonia concentration liquid separated by the separator is cooled by the low-temperature mixed medium condensate pumped in the heat exchanger and then flows into the absorber via the throttle valve. Mixes and absorbs steam having a high ammonia concentration from the cooler.

The mixed medium that has been mixed and absorbed flows into the condenser and exchanges heat with cooling water, such as deep seawater, to be condensed and condensed. This condensed liquid is returned to the heater via a heat exchanger that cools the liquid having a low ammonia concentration separated by the separator after being pressurized by the pump.

In the refrigerated carbon dioxide / oxygen liquefaction apparatus 8 of the refrigerated CO ₂ and O ₂ liquefaction system 58, the compressor compresses combustion gas (consisting of carbon dioxide and water vapor) or oxygen gas. This is guided to a cooler and cooled using a refrigerant generated in a cooler of the absorption refrigeration apparatus 2, and the steam of the combustion gas is separated and recovered by a purification apparatus and stored as pure water for water electrolysis.
The carbon dioxide gas is expanded adiabatically, liquefied, collected and stored.

The oxygen gas is again over-compressed to a high pressure by the compressor, and the refrigerant is cooled by the cooler of the absorption refrigeration system 2 and a part of the liquefied oxygen is vaporized by the cooler. The liquid is cooled to a temperature below the stepped portion, expanded and cooled by an expansion turbine and an expansion valve to generate liquid oxygen, and stored in the liquid oxygen storage tank 9.

The storage / cooling / heat converter 4 sends a refrigerant such as liquid propane to the cryogenic carbon dioxide-oxygen liquefier 8 during the daytime when peak power demand is generated, and compresses the combustion gas or oxygen gas. Is removed by heat exchange, and a refrigerant such as heated liquid propane returns to store the refrigerant.

Further, the liquid carbon dioxide and the liquid oxygen are led from the liquid carbon dioxide gas storage tank 10 and the liquid oxygen storage tank 9 to the storage cooling / heat converting device 4 and pump-pressurized in a liquid state to store the stored heated liquid propane. And heat exchange with a refrigerant 25 such as, for example, to vaporize them into carbon dioxide gas and gaseous oxygen, and send them to the combustor 11 as a high-pressure inert gas and oxidizing gas.

On the other hand, the heat-exchanged refrigerant such as liquid propane is cooled, and these are cooled by a cryogenic carbon dioxide-oxygen liquefaction unit 8.
And stored as a refrigerant such as liquid propane used to remove heat generated in the compression step.

In the water electrolysis device 17 of the methanol synthesis system 57, the pure water 23 is electrolyzed using nighttime electric power to generate hydrogen gas and oxygen gas. The oxygen gas is sent to a cryogenic carbon dioxide-oxygen liquefaction unit 8 to be liquefied and stored. The hydrogen gas is sent to a methanol synthesizer 18 where it reacts with carbon dioxide using a catalyst to synthesize methanol. As the pure water 23 used for the electrolysis of water, the condensed water collected when the combustion gas is liquefied is used.

The methanol synthesizer 18 uses a catalyst to convert the hydrogen gas supplied from the water electrolysis device 17 through the hydrogen supply pipe 44 at night and the carbon dioxide gas supplied from the storage and cooling converter 4 through the carbon dioxide gas supply pipe 45 at night. To synthesize methanol. The synthesized methanol is sent to a methanol storage tank 19 for storage.

In the methanol gas turbine combined cycle system 26, during the daytime, methanol is supplied from the methanol storage tank 19 to the combustor 11, and high-pressure carbon dioxide gas and oxygen gas are supplied via the storage cooling / heating converter 4. Methanol is pressurized to form a spray, mixed with oxygen gas, and burned with oxygen. Carbon dioxide gas is supplied as an inert gas.

The composition of the combustion gas is carbon dioxide gas and water vapor. The combustion gas is supplied to the gas turbine 12, which drives the gas turbine 12 to rotate a generator coaxially coupled thereto to generate power. The exhaust gas of the gas turbine 12 is supplied to the waste heat boiler 13, performs condensate and heat exchange from the second mixed medium device 15, and is transferred to the cryogenic carbon dioxide-oxygen liquefier 8, where Separated into pure water, converted and stored.

The steam generated from the condensate by performing heat exchange with the combustion gas in the waste heat boiler 13 is supplied to the steam turbine 14, which drives the steam turbine 14 to rotate the coaxially coupled generator 42. Generate electricity. The exhaust gas of the steam turbine 14 is sent to the heater of the mixed medium device 15, and performs heat exchange to return water.

The heater of the mixing medium device 15 uses the steam turbine 14
The mixed medium of water and ammonia that has exchanged heat with
In the separator, it is separated into a high ammonia concentration vapor and a low ammonia concentration solution. Steam with high ammonia concentration is mixed
The electric power is supplied to the generator 16 and is driven to rotate a generator 47 coaxially coupled thereto to generate electric power.

The exhaust gas of the mixed-medium turbine 16 returns to the mixed-medium device 15 and is mixed and absorbed by the solution having a low ammonia concentration which has been separated, and is cooled by deep cold seawater (about 600 m deep seawater).
It is condensed by exchanging heat with cooling water such as 7.5 ° C) to return to the liquid. The condensed liquid is pressurized by a pump and returned to the heater via the heat exchanger.

Next, the effects of the first embodiment of the present invention will be described. (1) 100% recovery of carbon dioxide gas by generating and storing methanol with nighttime power and thermal energy, and generating methanol gas turbine power that performs oxyfuel combustion in carbon dioxide gas during the daytime when peak power demand occurs Thus, load leveling can be achieved without emission of carbon dioxide to the environment.

(2) A mixed-medium power generation system is provided in the nuclear power generation system, and a water / second mixed-medium mixed-medium power generation system is additionally installed in the methanol gas turbine combined power generation system to improve the power generation efficiency and improve the environment. This makes it possible to achieve load leveling with little waste heat and no emission of carbon dioxide gas.

(3) By using carbon dioxide as an inert gas during methanol combustion, the combustion gas is composed of only water vapor and carbon dioxide, so that carbon dioxide can be easily recovered.

FIG. 2 shows a first example of a modification of the first embodiment shown in FIG. 1. The second mixed medium power generation system 46 is omitted, and the methanol gas turbine combined power generation system is removed. Exhaust side of 26 steam turbines 14 and nuclear power system 1
The first mixed-medium power generation system is connected by connecting the exhaust pipe 33, the inlet side of the waste heat boiler 13 and the recirculation pipe 34 of the nuclear power generation system 1.
It is shared with 30. Other parts are the same as those in FIG. 1, and the description of the overlapping parts will be omitted.

In this example, by removing the second mixed-medium power generation system 46 and sharing it with the first mixed-medium power generation system 30, the combined power generation plant can be rationalized and the power generation equipment cost can be reduced.

FIG. 3 shows a second example of a modification of the first embodiment. The steam pipe 35 and the mixed medium turbine 7 of the first mixed medium power generation system 30 in the first embodiment are shown in FIG. , The generator 36 and the return pipe 37 are deleted, and a condenser 27 is provided in place of the first mixed medium device 6, and the condenser 27 is connected to the exhaust pipe 33 of the steam turbine 5, and the condenser 27 is connected to the condenser 27. Is connected to the inlet side of the circulation pump 29. Other parts are the same as those in FIG. 1, and the description of the overlapping parts will be omitted. In this example, by deleting the first mixed-medium power generation system 30 and sharing it with the second mixed-medium power generation system 46, the combined power generation plant can be rationalized as in the first example of the modification, and the power generation equipment cost can be reduced. Can be reduced.

FIG. 4 shows a third example of a modification of the first embodiment, in which a refrigerant production system 28 is provided in place of the absorption refrigeration system 2 in the first embodiment. It is in. This refrigerant production system 28 is for producing a refrigerant using high-concentration ammonia generated in the first mixed medium device 6, and according to the third example, the mixed medium power generation system is partially used. By doing so, it is possible to reduce the equipment cost of the refrigeration apparatus by rationalizing the refrigerant production system.

Next, a second embodiment of the combined cycle power plant according to the present invention will be described with reference to FIG. FIG. 5 shows a nuclear power system 1, an absorption refrigeration system 2, and a mixed medium power system.
FIG. 5 shows a load-leveled combined cycle power plant composed of a fuel cell 30 and an ammonia refrigerant storage tank 25, etc.
The same parts as those in FIG. 1 are denoted by the same reference numerals, and the description of the overlapping parts will be omitted.

In this embodiment, the nuclear power generation system 1 that drives the generator 32 by rotating the steam turbine 5 by the steam generated in the nuclear reactor 3 and the mixed medium device 6 connected to the exhaust pipe 33 of the steam turbine 5 , Mixed media turbine 7 and generator
An absorption refrigeration system 2 connected to a mixed-medium power generation system 30 provided with 36 and an extraction pipe 39 for extracting air from the middle stage of the steam turbine 5
And an ammonia refrigerant storage tank 25 connected by piping between the absorption refrigeration apparatus 2 and the mixed medium apparatus 6.

That is, the medium-pressure gas extracted from the middle stage of the steam turbine 5 of the nuclear power generation system 1 is supplied to the absorption refrigeration system 2 through the extraction pipe 39, and the condensed water that has been cooled and returned is returned to the circulation pump 40 through the return water supply pipe 40. Return to entrance side of 29. Also,
The exhaust gas of the steam turbine 5 is supplied to the mixing medium device 6 through the exhaust pipe 33 in the final stage, and the condensed water that has been cooled and returned to the liquid flow returns to the inlet side of the circulation pump 29. Further, in the mixed medium device 6,
High-concentration ammonia vapor is generated and supplied to the mixed-medium turbine 7 to drive the generator 36 to generate power and circulate. The circulated ammonia vapor is cooled with deep cold seawater 24 in order to recover the liquid.

The low-temperature catalyst generated by the absorption refrigeration system 2 passes through a low-temperature refrigerant supply pipe 51 to an ammonia refrigerant storage tank.
Guided to 25, the ammonia liquid is cooled and stored as a low-temperature ammonia refrigerant. The heated refrigerant returns to the absorption refrigeration apparatus 2 through the return pipe 52, and performs heat exchange in an evaporator (not shown).

The stored low-temperature ammonia refrigerant is led to the condensate section of the mixing medium device 6 by the introduction pipe 53 and the introduction pump 54, and exchanges heat with (or absorbs) the exhaust gas of the mixing medium turbine 7. The ammonia refrigerant (or condensate) that has condensed and has become hot after heat exchange returns to the return pipe 55
And circulates to the ammonia refrigerant storage tank 25. In the mixing medium device 6, the deep seawater 24 flows in through the cold seawater supply pipe 41 by the seawater supply pump 38 and flows out through the outflow pipe 56.

Next, the operation of the present embodiment will be described. The coolant made of light water is heated in the nuclear reactor 3 to become saturated steam, and this steam is sent to the steam turbine 5 via the main steam pipe 31. The steam sent to the steam turbine 5 drives the steam turbine 5, and the rotation energy of the steam turbine 5 is converted into electric energy in the generator 32 to generate power. The exhaust gas from the steam turbine 5 is sent to the mixing medium device 6 via the exhaust pipe 33, performs heat exchange in the mixing medium device 6, condenses water, flows into the inlet side of the circulation pump 29, and flows into the reactor 3. It is refluxed.

In the daytime when power demand is high, no air is extracted from the middle stage of the steam turbine 5, and the entire amount of exhaust gas from the steam turbine 5 is supplied to the heat exchange section of the heater of the mixing medium device 6. The heat is exchanged to return to the inlet side of the circulation pump 29 of the nuclear power generation system 1.

The mixed medium of water and ammonia heated by the heater is separated by the separator into a vapor having a high ammonia concentration and a solution having a low ammonia concentration. The steam having a high ammonia concentration is supplied to the mixed medium turbine 7, which drives the mixed medium turbine 7 to rotate the generator 36 connected coaxially to generate electric power.

The exhaust gas of the mixed-medium turbine 7 returns to the mixed-medium device 6, is mixed and absorbed by the solution having a low ammonia concentration separated beforehand, and is supplied from the seawater supply pump 38 to the cold seawater supply pipe 41.
The water is condensed by heat exchange with cooling water such as deep cold seawater 24 (approximately 7.5 ° C. in seawater at a depth of about 600 m) that flows in through the tank and is condensed to return. The condensed liquid is pressurized by a pump, returns to a heater (not shown) via a heat exchanger, and flows out of an outflow pipe 56.

During nighttime when power demand is small, bleeding is performed from the middle stage of the steam turbine 5, and heat exchange with a mixed medium of water and ammonia is performed in the heat exchange section of the heater of the absorption refrigeration system 2, and the nuclear power generation system Reflux to the inlet side of the circulation pump. The mixed medium of water and ammonia heated by the heater is separated by the separator into a vapor having a high ammonia concentration and a solution having a low ammonia concentration.

The steam having a high ammonia concentration is condensed by exchanging heat with cooling water such as deep cold seawater (approximately 7.5 ° C. in seawater having a depth of about 600 m) in a condenser, and the condensate passes through an expansion valve. Flow into cooler. When passing through the expansion valve, the refrigerant becomes a low-temperature refrigerant by adiabatic expansion. The refrigerant in the cooler is sent to the ammonia refrigerant storage tank 25 to generate and store low-temperature ammonia refrigerant. The refrigerant generated in the cooler becomes high in temperature and circulates through the absorption refrigeration system 2.

When peak power demand occurs during the day, the low-temperature ammonia refrigerant stored in the ammonia refrigerant storage tank 25 is guided to the heat exchange section of the liquid condensing section of the mixed medium device 6.
Heat exchange (or mixed absorption) is performed with the high-concentration ammonia vapor exhausted from the mixed medium turbine 7 to condense at a lower temperature than deep cold seawater.

Next, the effect of this embodiment will be described. A low-temperature ammonia refrigerant is generated by nighttime electric power, guided to the heat exchange section of the liquid condensing section of the mixed medium device 6 in the daytime when peak power demand occurs, and the high-concentration ammonia vapor discharged from the mixed medium turbine 7 is subjected to deep cooling. Condenses at temperatures lower than seawater temperature. As a result, the thermal efficiency of the mixed-medium turbine 7 can be improved to meet peak power demand, and a combined cycle power plant can be provided.

In addition, an alcohol-based refrigerant is used in the absorption refrigeration apparatus 2 to generate a refrigerant having a temperature equal to or lower than the temperature at which ammonia is frozen. Using this refrigerant, ammonia ice is generated and stored in the ammonia refrigerant storage tank 25. Furthermore, by storing ammonia as ice, the capacity of the storage tank can be reduced, and the power plant construction cost can be reduced.

[0088]

According to the first to ninth aspects of the present invention, when nighttime power demand is low, pure water is electrolyzed and oxygen is liquefied and stored using the heat energy of nuclear power, and hydrogen is generated during peak power generation. It is converted to methanol under the action of a catalyst liquefied and stored with the generated carbon dioxide gas and stored.

During peak demand in the daytime, the stored methanol, liquid oxygen and liquid carbon dioxide are pressurized,
The gas turbine is driven by vaporizing and performing oxyfuel combustion in carbon dioxide gas to generate combustion gas, and the waste heat of the gas turbine is used to drive the steam turbine. The steam is generated to drive the mixed-medium turbine to generate power corresponding to peak power demand.
Carbon dioxide gas generated by methanol combustion is liquefied and stored.

Thus, the fuel for the daytime peak power generation is manufactured and stored by using the power of the nuclear power plant at night and the thermal energy, and the fuel is burned during the day to generate power to cope with the load fluctuation. And the generation of carbon dioxide gas can be suppressed.

[Brief description of the drawings]

FIG. 1 is a system diagram showing a first embodiment of a combined cycle power plant according to the present invention.

FIG. 2 is a system diagram showing a first example of a modification of the first embodiment according to the present invention.

FIG. 3 is a system diagram showing a second example of the modification.

FIG. 4 is a system diagram showing a third example of the modification.

FIG. 5 is a system diagram showing a second embodiment of the combined cycle power plant according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Nuclear power generation system, 2 ... Absorption type refrigeration apparatus, 3 ... Reactor, 4 ... Storage cooling / heat conversion apparatus, 5 ... Steam turbine, 6 ... First mixed medium apparatus, 7 ... Mixed medium turbine, 8 ... Deep cooling type Carbon dioxide-oxygen liquefaction unit, 9: liquid oxygen storage tank, 10: liquid carbon dioxide storage tank, 11: combustor, 12: gas turbine, 13
... Waste heat boiler, 14 ... Steam turbine, 15 ... Mixed media unit, 16 ... Mixed media turbine, 17 ... Water electrolyzer, 18 ... Methanol synthesizer, 19 ... Methanol storage tank, 20, 21, 22 ... Electric power, 23 ... Pure water, 24 ... deep cold seawater, 25 ... ammonia refrigerant storage tank, 26 ... methanol gas turbine combined power generation system, 27 ...
Condenser, 28 ... Refrigerant production system, 29 ... Circulation pump, 30 ...
First mixed-medium power generation system, 31: main steam pipe, 32: generator,
33 ... exhaust pipe, 34 ... reflux pipe, 35 ... steam pipe, 36 ... generator, 37
... Return pipe, 38 ... Seawater supply pump, 39 ... Bleed pipe, 40 ... Return water supply pipe, 41 ... Cold seawater supply pipe, 42 ... Generator, 43 ... Oxygen supply pipe, 44 ... Hydrogen supply pipe, 45 ... Carbon dioxide supply Pipes, 46 ... second mixed-medium power generation system, 47 ... generator, 48 ... oxygen supply pipe, 49 ...
Carbon dioxide supply pipe, 50… Methanol supply pipe, 51… Low temperature refrigerant supply pipe, 52… Return pipe, 53… Introduction pipe, 54… Introduction pump, 55… Return pipe, 56… Outflow pipe, 57… Methanol synthesis system, 58 ... Fukahiyashiki CO _2, O ₂ liquefaction system, 59 ... nuclear power generation system.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F02C 6/14 F02C 6/14 G21D 5/00 G21D 5/00 (72) Inventor Hideharu Hirono Kawasaki, Kanagawa Prefecture No. 1, Komukai Toshiba-cho, Ichiyuki-ku, Toshiba R & D Center (72) Inventor Shigeaki Kadoyama 8 Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture F-term in Toshiba Yokohama Office (reference) BB00 BB03 BB07 BC00 BC07 BD02 BD04 BD10 DA22

Claims (10)

[Claims] 1. A nuclear power generation system for driving a generator by rotating a steam turbine by steam generated in a nuclear reactor, an absorption refrigeration device connected to an exhaust gas side of a steam turbine of the nuclear power generation system, A cryogenic liquefaction device connected to the refrigeration device, a storage cold energy conversion device connected to the cryogenic liquefaction device, a methanol gas turbine combined power generation system including a combustor connected to the storage cold energy conversion device, A combined power plant comprising: a water electrolysis device connected to a cold liquefaction device; and a methanol synthesis system provided with a methanol synthesizer connected to the storage cold energy conversion device. 2. A mixed-medium power generation system including a mixed-medium device, a mixed-medium turbine, and a generator is provided between the nuclear power generation system and the absorption refrigeration system, and an inlet side of a reflux pipe of the mixed-medium device is provided. 2. The reactor according to claim 1, wherein the exhaust pipe is connected to a final exhaust pipe of the steam turbine, and an outlet side of the reflux pipe is connected to an inlet side of a circulation pump of the nuclear reactor.
A combined power plant as described. 3. The combined cycle power plant according to claim 2, wherein said mixed medium power generation system comprises a water and ammonia mixed medium power generation system. 4. The combined cycle power plant according to claim 1, wherein a refrigerant production system is provided instead of the absorption refrigeration system. 5. The combined cycle power plant according to claim 1, wherein water, an ammonia-based refrigerant, and an alcohol-based refrigerant are used in the absorption refrigeration apparatus. 6. An exhaust gas from a waste heat boiler of the methanol gas turbine combined cycle system is led to the cryogenic liquefaction apparatus,
Liquid carbon dioxide and pure water were separated and stored, pure water was electrolyzed to generate hydrogen and oxygen, oxygen was led to the cryogenic liquefaction apparatus, stored as liquid oxygen, and hydrogen was stored Carbon dioxide gas is vaporized to produce methanol using a catalyst and stored, and the stored methanol, liquid oxygen and liquid carbon dioxide are pressurized, vaporized and burned to drive a gas turbine with the combustion gas generated. The combined cycle power plant according to claim 1, wherein the combined cycle power plant performs power generation. 7. The combined cycle power plant according to claim 1, wherein deep mixed seawater is used for cooling the mixed medium device of the mixed medium power generation system or the condensing portion of the condenser. 8. A second mixed medium device connected to a waste heat boiler and a steam turbine of the methanol-gas turbine combined power generation system, a second mixed medium turbine and a second generator.
The combined power generation plant according to claim 1, wherein a mixed-medium power generation system is provided. 9. An exhaust pipe of a steam turbine of the methanol gas turbine combined power generation system is connected to the mixed medium device, and an outlet pipe of the mixed medium device is branched to a waste heat boiler of the methanol gas turbine combined power generation system. 3. The combined cycle power plant according to claim 2, wherein the combined cycle is connected. 10. A nuclear power generation system for driving a generator by rotating a steam turbine by steam generated in a nuclear reactor, a mixing medium device, a mixing medium turbine, and a power generator connected to an exhaust pipe of a steam turbine of the nuclear power generation system. And a mixed-medium power generation system equipped with a heat exchanger, an absorption refrigeration unit connected to an extraction pipe for bleeding air from the middle stage of the steam turbine, and an ammonia refrigerant storage tank connected to the absorption refrigeration device and the mixed medium device by piping. A combined cycle power plant characterized by the following.