JPS5853603A - Method of sealing turbine gland by utilizing waste heat - Google Patents

Abstract

PURPOSE:To reduce the consumption of a steam generated from an atomic furnace by preheating water supplied to a gland steam producer by utilizing a waste heat generated from an exhaust gas recombination device in a turbine gland steam system. CONSTITUTION:Water supplied from an supplementary feed water system 22 is supplied to a turbine gland steam generator 1 through an exhaust gas condenser 2. Supplied water passing through said exhaust gas condenser 2 is preheated by a recombined produced gas which is elevated in its temperature by an exothermic reaction in an exhaust gas recombination device 12. Fed water is exaporated by the high temperature steam introduced from a steam bleeding system 23 in said gland steam generator 1 and is supplied to a gland sealing position 21 of a steam turbine 20 to make sealing operation. Thus, the consumption of the steam generated from an atomic furnace which is a heat source of said gland steam generator can be saved efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a 4hO for boiling water basin and pressurized water go turbine gland steam generator of a nuclear power plant.

The above-mentioned nuclear power generation plant is generally provided with a turbine gland steam system and a gaseous waste treatment system, which will be described next. In the turbine gland steam system, a portion of the good steam generated in the reactor is consumed in sealing the turbine gland, resulting in a loss of thermal energy. Since heat is generated, this is cooled by the reactor auxiliary cooling system.

FIG. 1 is a system diagram of the turbine gland steam system mentioned above. The steam turbine 20 is rotated by high-temperature, high-pressure steam generated in a nuclear reactor (not shown). The above turbine 2
In order to prevent steam leakage from the gland seal portion 21.degree. 21, a turbine gland steam generator 1 is provided, and steam is supplied via a tarped 2nd steam supply pipe 5 and a turbine gland steam pressure regulating valve 8.

In order to generate the above-mentioned turbine gland steam generator IK steam, supply water at approximately room temperature is supplied from the make-up water system 22 through the supply water inlet pipe 3t, and the steam turbine extraction system 23
High-temperature steam is supplied from the reactor via the reactor-generated steam inlet pipe 6. The steam that has given heat to the feed water is partially liquefied and guided to the feed water heater 24 .

(9) In order to back up the turbine ground steam system mentioned above, it is possible to supply steam from the station steam system 25 to the ground cooling section 21 of the turbine via the station steam stop valve 15 and the station steam inlet pipe 14. There is.

As described above, the turbine gland steam generator 11
For example, the amount of reactor generated steam consumed by
15,000 for a 00MW class 6 nuclear power plant
kg/h.

Figure wi2 is a system diagram of the aforementioned gaseous waste treatment system.

In nuclear power plants, hydrogen gas and oxygen gas generated in the reactor core mix into residual gas in the condenser. The gaseous waste treatment system dilutes the hydrogen gas concentration in the residual gas to below the flammable limit (4%) and sends it to the hold-up device.

(See Figure 2) The residual gas (exhaust gas) in the main condenser 26 is heated in the preheater 11 and then sent to the exhaust gas recombiner 12, where the hydrogen gas and oxygen gas are combined by a catalytic reaction. I am forced to do it. Since the combination of hydrogen and oxygen is an exothermic reaction, the temperature of the exhaust gas increases. This is led to the exhaust gas condenser 2 and cooled by cooling water supplied from the reactor auxiliary equipment cooling system 27. The water liquefied in the exhaust gas condenser 2 is led to the main condenser 26, and the gaseous components are dehumidified by the dehumidification cooler 13 and then sent to the gold gas hold-up device 28, where the radioactivity of gaseous fission products is is attenuated before being released into the atmosphere.

The amount of cooling water consumed by the above-mentioned exhaust gas condenser 2 in the reactor auxiliary cooling system is approximately 500 ma 7 hours in the case of a 1100 MWe class nuclear power plant, for example, and the amount of heat absorbed by the cooling water is approximately 4 x 10" 1 (Cat/h.

The present invention has been made in view of the above circumstances, and aims to provide a method for improving the overall efficiency of a nuclear power plant by utilizing waste heat generated by exhaust gas recombination as a heat source for a turbine gland steam generator. This is the purpose.

In order to achieve the above object, the method according to the present invention uses the waste heat generated from the waste gas recombiner to preheat the feed water of the turbine gland steam generator. It is characterized by cooling the generated gas and preheating the water supplied to the turbine grand steam generator at the same time, thereby reducing the consumption of reactor generated steam used as a heat source for the turbine grand steam generator.

Next, an embodiment of the present invention shown in FIG. 3 will be described.

In this embodiment, supply water from the make-up water system 22 is supplied to the turbine gland steam generator l via the exhaust gas condenser 2.

The feed water passing through the exhaust gas condenser 2t is preheated by the recombined gas heated by the exothermic reaction in the exhaust gas recombiner 12. The high-temperature side fluid of the exhaust gas condenser 2 is extracted from the main condenser 26 and is then supplied to the preheater 1.
After preheating in step 1, the catalyst is heated in recombiner 12.
The exhaust gas is fed to the exhaust gas condenser 2 via the exhaust gas supply pressure regulating valve 9.

The exhaust gas of the AM is cooled in the exhaust gas condenser 2, and a part of it is liquefied. The liquefied components (mainly water) are transferred to the main condenser 26
After passing through the dehumidifying cooler 13, the gas component is led to the rare gas hold amplifier device 28.

The feed water, which is the low-temperature side fluid of the exhaust gas condenser 2, is led from the make-up water system 22 to the exhaust gas condenser 2, and while passing through here, it exchanges heat with the high-temperature exhaust gas and rises. , flows into the turbine gland steam generator 1. The inflowing supply water is passed through the extraction system 2 in the turbine gland steam generator 1.
It is heated by the high-temperature steam sent in from 3 and becomes steam. The steam thus generated is transferred to a steam turbine in a manner similar to the prior art method described with reference to FIG.
It is supplied to the gland 7-1 part 21 of No. 0 to perform a sealing action, and is recovered to the gland steam condenser 29.

When the present invention is applied to generate steam for gland sealing as described above, the supply water flowing into the turbine gland steam generator 1 is preheated in the exhaust gas condenser 2, so The consumption of the heating steam 6 to be fed is reduced.

For example, in a 1100 MWeN Ichiji power plant, the conventional method uses 9.5×10° [cat/
h of reactor generated steam is consumed, but when the present invention is applied, the generated heat due to exhaust gas recombination is consumed
/ht can be used, so approximately 40% of the steam consumption generated by the reactor is consumed.
can be saved.

Furthermore, in the method according to the prior art, the exhaust gas condenser 2 must be cooled using the cooling water of the reactor auxiliary cooling system 27 (see FIG. 2), but in the method of the present invention, the cooling water described above must be used. Since no water is used, the cooling water circulation load on the reactor auxiliary equipment cooling system is reduced.

For example, in the case of a 1100 MWe class nuclear power generation ground,
The cooling water circulation flow rate in the conventional method is soom”/h,
This circulating load corresponds to about lθ% of the load on the auxiliary equipment cooling system. Therefore, according to the method of the present invention, the equipment space for the reactor auxiliary equipment cooling system can be reduced by about 10%.

As can be easily understood from the configuration of the method of the present invention explained above, when implementing the turbine gland sealing method according to the present invention using nuclear power plant equipment that has implemented the turbine gland sealing method according to the prior art, Previously used main l! The equipment can be used for almost the entire time, and apart from modifying the island piping system, no additional equipment is required.

For example, if the present invention is implemented in an I100MWI class nuclear power plant, the power generation output will be approximately 200K.
An increase in output of W is obtained. This increase in output is the plant #it
If the Im rate is 75%, it will cost approximately 16.04 yen per year.
) Revenue will increase by 0.000.

As explained above, the present invention leads supply water to a turbine gland steam generator of a steam turbine using nuclear reactor generated steam as a power source, and uses the steam generated in the turbine gland steam generator to seal the steam turbine gland. In the turbine gland steam system, which performs sealing of the turbine gland steam generator, waste heat generated from the exhaust gas recombiner is used to preheat the supply water of the turbine gland steam generator, thereby reducing the The consumption of generated steam can be reduced and the overall efficiency of nuclear power plants can be improved.

[Brief explanation of the drawing]

Fig. 1 is a system diagram of a turbine gland steam system commonly used in the past, Fig. 2 is a system diagram of a gaseous waste treatment system, and Fig. 3 is a system diagram of a turbine gland sealing method using a waste heat ladle according to the present invention. It is a system diagram in one example. l... Turbine grand steam generator, 2... Exhaust gas condenser, 11... Preheater, 12... Exhaust gas recombiner, 13... Waste gas dehumidification cooler, 20... Steam Tarpy/, 21...#Meta-bing land seal part. Agent Patent Attorney Masami Akimoto

Claims (1)

[Claims] 1. A turbine grand steam system that guides supply water to the turbine grand steam generator of a steam turbine powered by reactor-generated steam, and seals the grand seal part of the steam turbine with the steam generated by the turbine grand steam generator. In this method, waste heat generated from the exhaust gas recombiner is used to preheat the feed water, thereby reducing the consumption of reactor generated steam, which is the heat source of the tarped steam generator, by t% mold. Turbine ground cooling method using waste heat.