JPS62232597A - Auxiliary steam system - Google Patents

Abstract

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

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an auxiliary steam system and an in-station steam system of a power generation plant, and particularly aims to reduce the operating cost of in-station steam and the reduction in in-station steam drive equipment. This invention relates to the configuration of an auxiliary steam system suitable for.

[Conventional technology]

In conventional power plants, as described in Japanese Patent Publication No. 53-34280, when the plant is started up.

The steam generated by the in-house gas generator (
In-house steam) is used. Reactor main steam pressure rises (
(approximately 20 kg/cjg), the station steam supply is stopped and the operation is switched to main steam supply operation.

In other words, the startup air extractor stops, the main air extractor is supplied with driving steam from the main steam, and the turbine gland steam supply supplies main steam to the evaporator (evaporator), and the steam generated by the evaporator is supplied to the main air extractor. Supplied as turbine gland seal steam. Figure 1 shows the system configuration described above, and Figure 2 shows the method of operation.

[Problem that the invention seeks to solve]

In the above-mentioned conventional technology, during the period until the main steam pressure of the reactor 1 rises to about 20 kg/dig at the time of plant startup, as shown in FIG. I supply it.

The problems in this case will be described below. The first is that steam generated by a heavy oil-fired in-house boiler must be used, which is expensive to operate. Second, internal steam enters the system and becomes radioactive, resulting in an increase in surplus water within the power plant, which must ultimately be discharged outside the system after liquid waste treatment. Thirdly, the pipes 4 and valves 5 constitute the in-house steam supply system. Equipment for the starting air extractor 3 is required, which increases the installation cost. An object of the present invention is to solve the above problems.

[Means for solving problems]

During normal operation, it is used as driving steam to the main air extractor 6 and heating steam to the evaporator 7 for generating turbine gland steam.
Auxiliary steam, which is the steam generated by the reactor 1, which is low in operating cost, is supplied, but the above purpose is achieved by supplying auxiliary steam from an adjacent normally operating plant to a plant that is about to start up. Ru. Specifically, a connecting line will be provided to the auxiliary steam line of the adjacent plant.

[Effect]

Since auxiliary steam with a higher pressure than the normally operating adjacent plant is supplied to the plant that is about to start up, the in-house steam supply that was used as a preliminary step until the pressure rise becomes unnecessary.

(Embodiment) An embodiment of the present invention will be described below with reference to FIG. 1. Adjacent plants are referred to as Unit No. 1 and Unit No. 2, respectively. Main air extractor 6 and evaporator 7 conventionally driven by main steam
branched from the auxiliary steam supply pipe 8 to the connecting pipe 9 and valve 10
will be added. That is, when the machine No. - is in normal operation and the No. 2 machine is to be started, the valve IO is opened and auxiliary steam is supplied from the machine No. - to the No. 2 machine. Unit 2 is in normal operation, -
The valve 10 is also opened when starting the machine. When the auxiliary steam pressure on the plant side to be started rises to about 20 kg/cJ, close the valve 10. That is, since there is no need for steam communication when both plants are in common use, the valves 1O are kept closed on both plant sides. Therefore, when starting up the plant, it is necessary to warm up the continuous JIB pipe 9. Therefore,
The communication pipe 9 forms a downward slope toward the mirror field side of both plants, branches from the lowest point, and connects to the adjacent condenser 11 with a drain treatment device 13 ( for example a trap) and a valve 14. Also, during normal operation, to prevent radioactive leakage steam from flowing out through the valve 10 from the side to the plant 1 in operation to the side in the stopped plant.

A leak-off recovery pipe 15 and a valve 16 are provided. That is, for example, even if leak-off occurs from unit - to unit 2, the condenser 11 of unit 1 which is in operation will be leaked through valve 1G of unit 2.
This prevents it from flowing into the stopped No. 2 reactor. In addition, as another example, drain processing bag bi
t3 may be an orifice or the like instead of a 1-lamp.

Another embodiment is shown in FIG. 4, in which the starting air extractor 3 of FIG. 3 is replaced by a side that supplies station steam from the station boiler to the driving steam line of the main air extractor 6 (in this case,
(The in-house boiler pressure needs to be higher than that of the startup air extractor type 3), but the present invention can be applied to this case as well. Fifth
M shows the operating method and each steam source in the present invention. In another embodiment, the configuration of the auxiliary steam pipe 8 to the air extractor 6 and the evaporator 7 is not one as shown in FIG. It can also be applied to a system configuration in which each branch is branched from the main steam.

〔Effect of the invention〕

According to the present invention, first, the starting air extractor 3, the in-house steam supply piping 4, and the valve 5 on the No. 2 unit side, which were installed in the prior art shown in FIG. 2, do not need to be installed.

Also, the in-house steam supply piping 4. to the turbine gland seal pipe 17 on the No. 2 unit side. Valve 5 also becomes unnecessary.

However, until the construction of Unit 2, the in-house steam supply equipment 3.4.5 will be installed only on the Unit 1 side to start up Unit 2. However, by the time Unit 2 is constructed, In-house steam supply 3.4.5 on the unit side becomes unnecessary. Second, the steam pressure generated within the plant, which has high operating costs, is reduced by a large amount. According to a trial calculation for an 800 MW class, the reduction will be approximately 40 T/h each time the plant is started. The second point is a reduction in surplus water within the plant, a reduction in the number of liquid waste treatment equipment and a reduction in the amount of pure water used to supply the plant boiler, resulting in a reduction in the cost of producing pure water.

[Brief explanation of drawings]

Fig. 1 is a system diagram of an embodiment of the present invention, Fig. 2 is a system diagram of an embodiment of the present invention without a startup air extractor, and Fig. 3 is a system diagram of an embodiment of the present invention during startup and plant operation according to the present invention. Figure 4 is a system diagram of auxiliary steam and in-house steam in the conventional technology, and Figure 5 is a diagram showing each steam source during startup and plant operation in the conventional technology. ``1'':l 1 Figure 7 Figure 3 Atsushi - 4 - 50 hours -

Claims (1)

[Claims] 1. An air extractor and drive steam system that extract exhaust gas from a condenser of an adjacent nuclear power plant by driving steam, and a condensate storage tank as steam for a turbine gland seal. An auxiliary steam system comprising an evaporator and its heating steam system for vaporizing and using water, and an auxiliary steam pipe that branches the driving steam system and the heating steam system from the main steam pipe generated by the reactor, An auxiliary steam system characterized by being provided with piping and valves that connect the adjacent auxiliary steam pipes.