JP4006545B2 - High-efficiency power generation and day-and-night power demand load leveling method - Google Patents

Description

Detailed Description of the Invention

[Technical field to which the invention belongs]
The present invention relates to a cooling method for exhaust heat of steam turbine mixed medium turbine both power plants and leveling of electric power demand load day and night.

[Conventional technology]
Conventionally, electric power generated in the daytime is consumed for cooling for condensate condensate of the exhaust steam exhaust mixed medium after power generation of the steam system and mixed medium power plant (for example, in the case of Kawauchi nuclear power generation capacity 1.78 million kW) The power consumption of the cooling water pump is 4.8 billion yen per year).
Economic development in recent years has seen a steady increase in power demand, including consumer electronics and industrial use, such as the increase in the size of home appliances and the spread of heating and cooling. The demand gap is widening. For example, it is said that the power demand gap of the largest domestic power company has reached 57% of the maximum value.
There is a pumped-storage power plant as an example of measures to improve the load factor, but the location is limited due to restrictions on the location, and the loss is large. Superconducting and fly-hole power storage methods are under development. Manufacturing and installing storage equipment is difficult.
As for the power storage using air compression, a method of storing it on the sea floor or underground space has been studied, but the scale is very large.
Therefore, liquid air is produced with midnight power and stored in the form of cold energy, and the compressor power is reduced by responding to the peak demand during the day by supplying liquid air to the combustor of the gas turbine generator. The technology for increasing the power transmission output is disclosed (see Japanese Patent Application Laid-Open No. 9-250360). In this method, energy efficiency of about 70% can be obtained, and liquid air is produced with midnight power and stored in the form of cold heat. Finally, a gas turbine generator is finally created by using a normal temperature superconducting system, freezer ice heat storage, etc. for cascade use of heat in the low temperature region where liquid air is pressurized and heated to atmospheric temperature during peak demand during the daytime A patent application has been filed in which high-pressure air is supplied to a combustor to reduce power for an air compressor to increase power transmission output (see Japanese Patent Laid-Open No. 9-13918). Water froze and stored in ice, and the ice-cold are the patent application that supplies to load leveling and desalination in district heating simultaneously. (Refer to JP-A-9-85232) As another cold storage method, use midnight power to store in low-temperature ammonia or carbon dioxide gas and heat it with the exhaust of the steam turbine to drive the expansion turbine for peak demand in the daytime. A technique for generating electricity is disclosed.
(Refer to Unexamined-Japanese-Patent No. 6-272517) The technique regarding the high thermal-efficiency power plant which combined the exhaust heat from a steam turbine to a mixed-medium turbine via a heat exchanger is disclosed (Japanese Unexamined Patent Publication No. Hei 9-). No. 209176)

[Problems to be Solved by the Invention]
As described above, since the electric power generated during the daytime is consumed for the cooling for the condensate condensate of the exhaust steam exhaust mixed medium system after the power generation of the conventional steam mixed medium power generation plant, As the power generation efficiency is only pushed down, there is a problem of improving the power generation efficiency. The challenge is to reduce the current power demand difference between day and night, which is about 43% of the difference in power demand between day and night.

  As described above, the cooling power consumption for condensate condensate of the conventional steam system and mixed medium system power generation after steam generation consumes daytime power, so the efficiency of the power plant is increased by the amount of power consumption. An object of the present invention, which has been reduced, is to significantly reduce the cooling power consumption at the peak of the daytime power demand, and to supply and sell the saved power.

The purpose is to provide nuclear thermal power plants that provide the effect of leveling the power demand load during the day and night, or during the season, and have greatly improved power generation thermal efficiency through the dual effect of power saving and power increase.

[Means for solving the problems]
In order to solve the above problems, a heat exchanger having both an ice cooling function and a water cooling function has been developed and used as a daytime condenser condenser with an ice cooling function having an extremely high cooling capacity. About 90% or more of power can be saved by stopping the pump drive, so the amount of power saved increases the power generation capacity, boosts efficiency, and provides a high-efficiency power plant.

The ice cooling function according to claim 1, wherein, in order to solve the problem of the difference in power demand between daytime and nighttime, the ice cooling function according to claim 1 is used at the peak of daytime power consumption, in which a large amount of ice is made and stored by an ice making machine using midnight surplus power. Use it to cool the condensate condensate of the exhaust steam exhaust mixed medium after power generation of the above power plant, store it by changing the midnight power to ice, and cool the exhaust steam and exhaust mixed medium of the power plant at the peak of daytime power demand By using the ice of late-night ice making, the daytime power of the conventional cooling water pump is saved, and the saved electricity becomes the supplied power, and the effect of leveling the demand load of the daytime and nighttime is obtained.

[Action]
As described above, since the present invention operates while continuously feeding ice into the condenser and condenser of the power plant, the temperature of ice having an extremely high cooling capacity is higher because of the ice direct cooling method. Cooling capacity is further increased by lowering the temperature.
Compared with the conventional water-cooled condensate condenser water-cooled method, the ice direct cooling method of the present invention is extremely high cooling, so that the condensation of the exhaust steam exhaust mixed medium is accelerated and the exhaust steam in the condenser The speed of the steam increases, the speed of the exhaust steam increases, and the speed of the steam turbine increases. The speed of the steam turbine increases, and the power generation capacity of the coaxial generator increases. Claim 2 refers to the number JP-A-124124937.

Although the configuration and function described in claim 1 of the present invention can be provided in a new power plant, the nuclear power and thermal power of claims 1 and 2 can be changed to the present invention by remodeling the condenser of the existing power plant. Since the construction and operation method material technology of both power plants are present, detailed illustrations and explanations of the power plant section and the condenser section are omitted.

[Embodiment of the Invention]
The embodiment of the present invention will be described with reference to FIG. 1. In the ice cooling function, the cooling water pump (8) is stopped, the clutches (3a, b) are closed, the hatch (11) is opened, and the ice conveying means is opened. (6) is driven to drive the circulation pump (10) that feeds ice (14) from the ice inlet (12) into the heat exchanger (1), and the cooling water (7) is circulated through the circulation pipe (9). The ice-cooled water is discharged from the ice-melted water drain pipe (15), the exhaust steam or the exhaust mixed medium after power generation that circulates inside the distribution pipe (2) is cooled by the conduction of ice, 2), the ice transport means (6) is stopped, the hatch (11) is used to open the clutches (3a, b) that seal the ice inlet (12), and the cooling water pump (8) is driven. Cooling water (7) is fed into the heat exchanger (1) through the cooling water feeding pipe (4) and circulated. The reject water (7) is discharged from the cooling water drain pipe (5), and the exhaust steam or the exhaust mixed medium after power generation that circulates inside the distribution pipe (2) is cooled by water, cooled as described above. Condensate condensate is circulated by a transfer means as before, heated by a heat source, vaporized and driven by a turbine to generate electricity with a generator. Ice (14) that operates with the ice cooling function, liquid air, and liquid nitrogen are power plants that are used as described above during the cold storage daytime with midnight power.

A cooling system for exhaust ammonia gas of an ammonia gas turbine (20) of a combined power plant configured by utilizing exhaust steam of a steam power plant as a heat source of an ammonia gas turbine power plant is provided with claim 1 (1). The combined power plant shown in FIG. The mixed medium is a mixture of ammonia and water.

Referring to FIG. 7, a gas turbine power plant that drives a gas turbine (24) with the discharge of burned gas and generates power with a coaxial generator (18) is connected to the pre-process of the combined power plant according to claim 2. Then, steam is obtained by the steam generator (26) by the exhaust gas heat of the gas turbine (24), and the steam is used as a heat source of the combined power plant of claim 2 to make the gas turbine power plant steam turbine power plant ammonia gas turbine power plant Three-link power generation method constructed by connecting in order.

The total amount of surplus power at midnight is very large. The surplus power at midnight is used to the maximum to make ice on a large scale with an ice maker and stored in a cold storage room. The ice (14), which uses the stored ice for ice cooling, has a lower temperature.
If another example of the change operation from the water cooling function to the ice cooling function is described in FIGS. 1 and 2, the cooling pump (8) that circulates the cooling water (7) by driving the circulation pump (10) is gradually removed. The cooling water (7) is decelerated to a certain extent and the ice (14) arranged immediately before opening the hatch (11) is quickly opened with the cooling water (7) circulating in the heat exchanger (1) to some extent. The cooling pump that was driven to decelerate when the ice transporting means (6) was driven to feed the ice (14) into the heat exchanger (1) and the ice (14) accumulated in the heat exchanger (1) to some extent. (8) is stopped, and the ice (14) for closing the clutch (3a, b) is continuously changed to the water cooling function when there is no ice to be sent.
Liquid nitrogen or liquid air can also be used in place of ice (14) frozen in water.

Referring to FIG. 4, both the mixed medium and the cooling water heat exchanger are provided in the double water condenser (21), and the exhaust steam discharged from the steam turbine (17) is primarily cooled by the mixed medium heat exchanger. In the case of a combined power generation by combined heat exchange of a mixed medium power plant that uses the exhaust steam of the steam turbine power plant as a heat source, which is secondarily cooled by a cooling water heat exchanger, a Minami steam turbine power generation (1 million kw) plant, The configuration shown in FIG. 4 is preferable.
〔The invention's effect〕
Since the present invention is configured as described above, the following effects can be obtained.

The cooling capacity of the ice cooling function is determined by the amount of ice used, but since it can be made on a very large scale, the power savings that can save more than 90% of the cooling pump during the daytime stoppage will increase the power generation efficiency and increase the power generation efficiency. I will provide a.

By converting ultra-large-scale surplus midnight power into large-scale ice storage and using it for power saving of cooling water pumps at the peak of daytime power demand, the power obtained by power saving increases daytime power supply. If installed, it will be possible to level out the power demand load on a very large scale day and night.

As described above, the high cooling function can increase the power by the effect of increasing the rotational speed of the turbine, and the power obtained in the present invention including the saved power is not shared with the exhaust gas such as CO _2. If set up, global warming can be suppressed globally.

1. Electric power is generated in an ammonia gas turbine power plant using the exhaust steam from the steam power plant as a heat source.
2. Obtaining a low temperature mixed medium liquid with the above ice cooling function By cooling the exhaust steam of the steam power plant with the low temperature mixed medium liquid, the power consumption of the cooling water and the cooling water pump is reduced by 90% or more. According to claim 2 of the dual effect of power generation and power saving, a combined power plant is provided in which the thermal efficiency is significantly improved as compared with the conventional power plant.

It is a schematic longitudinal cross-sectional view at the time of the ice cooling function of the embodiment of the present invention. It is a schematic longitudinal cross-sectional view at the time of the water cooling function of this invention Example. It is a schematic plan view of the combined power plant according to claim 2 of the present invention. It is a schematic plan view of the combined power generation method by combined heat exchange. It is a schematic plan view connected with the steam turbine of claim 1. FIG. 5 is a schematic plan view of a series water-cooled ice-cooled combined water method. It is a schematic plan view of three connected power generation

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat exchanger 2, 29, 30, Distribution pipe 3a 3b, 3c, Clutch 4, 41, Cooling water feed pipe 5, 51, Cooling water drain pipe 6, Ice conveyance means 7 Cooling water 8, 28, Cooling water pump 9 Circulation pipe 10 Circulation pump 11 Hatch 12 Ice inlet 13 Protective net 14 Ice 15 Ice melt drain pipe 16 Conventional condenser 17 Steam turbines 18, 28, 38, generator 19 Water supply pump 20 Ammore gas turbine 21 Condenser 22 Ammonia pump 23 Gas combustion chamber 24 Gas turbine 25 Water supply pipe 26 Steam generator

Claims (3)

The exhaust steam or exhaust mixed medium after power generation is cooled by circulating the inside of the circulation pipe (2) of the heat exchanger (1), the cooled condensate condensate is circulated by the transfer means, and re-steamed by the heat source. In a power plant that generates electricity by a generator driven by a turbine, the heat exchanger (1) uses ice (14) or liquid air liquid nitrogen that has been cooled and stored at midnight power during peak hours of daytime power demand. The ice cooling function operates at night, and the water cooling function operates at night. When the ice cooling function is in operation, the cooling water pump (8) is stopped, the clutches (3a, b) are closed, the hatch (11) is opened, and the ice is transported. The means (6) is driven to feed the ice (14) into the heat exchanger (1) from the ice inlet (12), and the circulating pump (10) is driven to pass the cooling water (7 ) And open the clutch (3c) to ice Water is discharged from the ice melt water drain pipe (15). When the water cooling function is in operation, the cooling water pump (8) is driven, the clutches (3a, b) are opened, and the ice transport means (6) is stopped. The ice inlet (12) is sealed with the hatch (11), and the cooling water (7) is fed into the heat exchanger (1) through the cooling water feed pipe (4) and circulated, and the circulation pump (10) is turned on. A power plant characterized by stopping and discharging cooling water (7) from the cooling water drain pipe (5). In a combined power plant that uses the exhaust steam of the steam power plant as a heat source for the ammonia gas turbine power plant, the steam power plant and the downstream ammonia gas turbine power plant use a mixture of ammonia and water as a working fluid. A combined power plant comprising a heat exchanger (1) for a power plant according to claim 1 for cooling exhaust ammonia gas after power generation in an ammonia gas turbine power plant. A gas turbine power plant connected to a pre-process of a combined power plant according to claim 2 by driving a gas turbine (24) with the discharge power of the burned gas and generating power with a coaxial generator (18). A power plant comprising a gas turbine power plant, a steam power plant, and a mixed-medium power plant connected to each other as a heat source for the exhaust gas heat.

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