JPS5811896A - Medium temperature using power facility of atomic power plant - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a zero boiling water nuclear power generation facility that uses a medium humidity utilization power generation facility in a nuclear power plant that uses a non-regenerative heat exchanger of a reactor coolant purification system of a boiling water nuclear power generation unit 1 as a heat source. At power plants, reactor feed water is purified from the turbine main condenser through a condensate demineralizer before being supplied.
In order to maintain high core purity at all times, there is a separate reactor coolant purification system that continuously removes a portion of the reactor coolant from the reactor recirculation system and purifies it.

Figure 1 is a system diagram of a conventional reactor coolant purification system, in which a part of the reactor coolant is transferred from the reactor recirculation system piping 2 connected to the reactor pressure vessel 1 to the reactor coolant purification system circulation pump. 3, and after being cooled sequentially through a regenerative heat exchanger 4 and a non-regenerative heat exchanger 5, it is introduced into a filtration demineralizer 6 for purification, and then heated again through a regenerative heat exchanger 4. The water is returned to the reactor pressure vessel 1 via a water supply pipe 7 from (omitted). The extracted reactor coolant is regenerated into heat exchanger 4.
The reason why the reactor coolant processed by the filtration demineralizer 6 does not function sufficiently is that it passes through the non-regenerative heat exchanger 5 twice. This is because it is necessary to cool down to 60° C. or lower, which is the operating temperature of No. 6.

Of the above two sets of heat exchangers, the regenerative heat exchanger 4 is cooled by the reactor coolant purified by the filtration demineralizer 6, and the thermal energy at that time is returned to the reactor pressure vessel 1 for reactor cooling. However, the non-regenerative heat exchanger 5 is cooled by cooling water from the reactor auxiliary cooling water system 8, and after cooling is disposed of directly into the ocean or river. However, there is a problem in terms of energy conservation, and there has been a demand for energy recovery measures for this non-regenerative heat exchanger.

This invention has been made in view of the above circumstances, and in a non-regenerative heat exchanger used in a reactor coolant purification system of a boiling water nuclear power plant, the reactor auxiliary cooling water system is used for cooling. A low-boiling point medium such as chlorofluorocarbons is used instead of cooling water, and the low-boiling point medium vapor is evaporated into steam by the heat of the other side during cooling, and the low-boiling point medium steam is used to operate the low-boiling point medium turbine, and the turbine is connected to a generator. The purpose of the present invention is to provide power generation equipment that utilizes medium humidity in a nuclear power plant, which connects the two to generate power, and recovers the thermal energy that was previously discarded as electrician energy.

An embodiment of the medium humidity power generation equipment for a nuclear power plant according to the present invention will be described with reference to a system diagram shown in FIG. Second
In the figure, circulation pump 10. Regenerative heat exchanger 11. Non-regenerative heat exchanger12. The filtration system 13 is the reactor coolant purification system 1
A part of the reactor coolant is taken out by the circulation pump 10 from the reactor recirculation system piping 15 which constitutes the reactor pressure vessel (not shown in the drawing) and is connected to the reactor pressure vessel (not shown in the drawing).
1 and a non-regenerative heat exchanger 12 to the appropriate operating temperature of the filtration demineralizer 13, then led to the filtration demineralizer 13 for purification, then warmed through the regenerative heat exchanger 11, and then cooled to the proper operating temperature of the filtration demineralizer 13. The water is returned to the water supply pipe 16 from the water system (not shown in the drawing) to the reactor pressure vessel (not shown in the drawing).

The reactor coolant sent by the circulation pump 10 is
In the regenerative heat exchanger 11 , heat is taken away by the reactor coolant that is purified by the filtration demineralizer 13 and returned to the water supply pipe 16 and cooled to a certain temperature, and then transferred to the non-regenerative heat exchanger 12
furthermore, the proper operating temperature of the filtration demineralizer 13 (60
In the present invention, a low boiling point medium such as fluorocarbon or ammonia is used for cooling in the non-regenerative heat exchanger 12. The low boiling point medium is heated and evaporated while passing through the cooling heat transfer tube 17 of the non-regenerative heat exchanger 12, and the generated low boiling point medium vapor is led to the low boiling point medium turbine 18 and drives this turbine 18. Then, the generator 19 connected to the low boiling point medium turbine 18 is rotated to generate electricity. The low-boiling point medium vapor that has completed its work in the low-boiling point medium turbine 18 is led to the condenser 20, where it is cooled by cooling water from the reactor auxiliary cooling water system 21 and becomes liquid, and is then returned to the reactor coolant by the feed pump 22. It is sent to the cooling heat exchanger tube 17 of the purification system non-regenerative heat exchanger 12. Furthermore, the low boiling point medium turbine 1
8 or the generator 19, a turbine bypass valve 23 and a bypass pipe 24 connecting it are provided in order to directly guide the low boiling point medium vapor to the condenser (5) 20. A low boiling point medium storage tank 25 is attached for storing a low boiling point medium.

The medium-humidity power generation equipment for a nuclear power plant according to this invention is as follows:
As detailed above for example embodiments, in a reactor coolant purification system of a boiling water nuclear power plant, a low boiling point medium, such as chlorofluorocarbons, is used to cool a non-regenerative heat exchanger. The generated low-boiling medium steam is used to drive a turbine generator and convert it into electrical energy, which is used for in-house power, etc., so thermal energy that was previously disposed of through the reactor auxiliary cooling water system is used. It has the advantage of being able to recover most of the In addition, the cooling water of the reactor auxiliary cooling water system is also used in the medium humidity power generation equipment of the nuclear power plant according to the present invention to liquefy the low boiling point medium vapor, but the cooling water of the reactor auxiliary cooling water system is Since the amount required is small compared to the amount used for cooling the regenerative heat exchanger, it has the effect of reducing the burden on the reactor auxiliary equipment cooling water system.

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[Brief explanation of the drawing]

FIG. 1 is a system diagram of a conventional nuclear reactor coolant purification system, and FIG. 2 is a system diagram of a medium-humidity power generation facility in a nuclear power plant according to an embodiment of the present invention. 12.5...Non-regenerative heat exchanger, 14...Reactor coolant purification system, 18...Low boiling point medium turbine, 19...
Generator, 20... Condenser, 21, 8... Reactor auxiliary equipment cooling water system, 22... Liquid supply pump, 23... Turbine bypass valve, 25... Storage tank. (7317) Agent Patent attorney Kensuke Norichika (and 1 other person) (7) Figure 1

Claims (1)

[Claims] In the reactor coolant purification system of boiling water nuclear power plants,
A low boiling point medium is used for cooling the non-regenerative heat exchanger, and a low boiling point medium turbine is driven by the low boiling point medium steam generated in the non-regenerative heat exchanger, and the low boiling point medium turbine is rotated by the low boiling point medium turbine. a generator, a condenser that cools and liquefies the low-boiling medium vapor that has finished work in the low-boiling medium turbine, and a feed pump that feeds the liquid low-boiling medium to the non-regenerative heat exchanger; a non-regenerative heat exchanger of the reactor coolant purification system, comprising: a storage tank for storing a low-boiling point medium; and a turbine bypass valve that bypasses the low-boiling point medium turbine and directly leads the low-boiling point medium vapor to the condenser; A power generation facility using medium humidity at a nuclear power plant that uses a low boiling point medium used for cooling as a working medium to generate electricity.