JPS6118158B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an internal heating steam supply device for supplying internal heating steam to each device of a nuclear power plant.

A conventional heating steam supply device for indoor use will be explained with reference to FIG. Steam generated by the station boiler 1 is supplied to the station equipment 3 through a steam pipe 2. The recovered steam is returned to condensate in a receiver set 5 and returned to the in-house boiler 1 through a condensate return pipe 4 by a pump 6. In this system, if a highly radioactive heater among the in-house equipment 3 is damaged, contaminated water directly enters the condensate return pipe 4 and the steam pipe 2, and the in-house heating steam, which was originally radioactively clean, is There was a risk of contamination of the supply equipment.

In order to prevent radioactive contamination of the in-house heating steam supply equipment, the present invention aims to introduce the steam generated by the nuclear reactor of the power plant to the evaporator during normal operation of the power plant, and to transfer the generated heated steam to the inside of the power plant. The purpose of this project is to obtain an in-house heated steam supply device for supplying to various equipment.

An embodiment of the present invention will be described below based on the accompanying drawings.

FIG. 2 is a system diagram showing one embodiment of the present invention. A steam pipe 13 branched from a bleed pipe 12 of the turbine 11 is connected to an evaporator 15 through a control valve 14 . A condensate pipe 16 is provided for returning the condensate of the steam that heated the evaporator 15 to the heater or the main condenser. A steam pipe 17 is led from the evaporator 15 to the in-house equipment 3 through a steam control valve 18 . A condensate return pipe 22 from the station equipment 3 is connected to the evaporator 15 through a receiver set 20 and a pump 21. Also, a makeup water pipe 23 is connected to the evaporator 15. Further, a steam pipe 25 from the in-house boiler 1 is connected to the evaporator 15 through a control valve 29. A condensate return pipe 28 from the evaporator 15 is returned to the local boiler 1 through a receiver set 26 and a pump 27.

In the in-house heating steam supply system configured as described above, during normal operation of the nuclear power plant, steam from the main turbine 11 and the extraction pipe 12 is guided to the heating coil of the evaporator 15 to remove water in the evaporator 15. Heat to obtain heated steam for internal use. This station heated steam is supplied to the station equipment 3. When the nuclear power plant is stopped, steam from the main turbine 11 cannot be obtained, so the steam from the in-station boiler 1 is introduced into another coil in the evaporator 15 and heated to obtain heating steam for in-station use. If some of the in-house equipment 3 contains radioactivity, the heater steam system (system consisting of the steam pipe 17, condensate return pipe 22, receiver set 20, and pump 21) may become radioactive due to a malfunction of the heater. However, the station boiler system (system consisting of steam pipe 25, receiver set 26, pump 27, and condensate return pipe 28) is not directly contaminated by contaminated water.

FIG. 3 shows another embodiment, and shows the second embodiment.
What differs from the figure is that an evaporator 37 is provided for heating backup while the power plant is stopped;
A steam pipe 35 from the heater is connected through a control valve 36. The heated steam condensate is returned to the station boiler 41 through a receiver set 38, a pump 39, and a condensate return pipe 40. Steam generated by this backup evaporator 37 is connected to the in-house equipment 3 through a control valve 42 and a steam pipe 43. When using the evaporator 37 for backup, the condensate from the in-house equipment 3 is not returned to the evaporator 15, but instead is returned to the return pipe 44.
It is returned to the evaporator 37 for backup through the evaporator 37. In this way, the in-house boiler system (steam pipe 35, evaporator 37, receiver set 3
8. Prevent the system (consisting of condensate return pipes) from direct radioactive contamination.

FIG. 4 shows yet another embodiment, in which the heating steam system by the evaporator is separated into a radioactively contaminated loop and an uncontaminated loop. The steam generated by the evaporator 15 heats the in-house equipment 30 that may be radioactively contaminated among the in-house equipment 3; An evaporator 56 for heating steam is also used at the same time for in-house equipment 50 (equipment that does not come into contact with radioactive materials). When the power plant is stopped, the backup coil is heated by introducing steam from the in-house boiler 1 to the evaporator 15, which may be contaminated, as shown in Figure 2. Directly connected to the steam from the In this way, the in-house boiler system is prevented from radioactive contamination, similar to FIGS. 2 and 3.

As explained above, the present invention reduces the possibility of radioactive contamination of the station boiler system by supplying the steam generated by the evaporator to the station heating steam supply system, compared to the conventional method. be able to. In particular, when in-house boilers are centrally installed in a separate building of a power plant, there is no need to extend the radiation control area to the separate building. It also has the effect of reducing the consumption of heavy oil in power plants, reducing operating costs, and reducing the generation of NO _x and SO _x due to heavy oil combustion.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing a conventional heating steam supply device for indoor use, FIG. 2 is a system diagram showing an embodiment of the heating steam supply device for indoor use according to the present invention, and FIGS. It is a system diagram showing another example. 1... In-house boiler, 3, 30... In-house equipment, 13...
Steam pipe, 14... Control valve, 15... Evaporator, 17... Steam pipe, 20, 26... Receiver set, 21... Pump, 25... Steam pipe, 51... Receiver set, 52
... Pump, 53... Condensate return pipe, 54... Station boiler steam pipe, 55... Station boiler steam control valve, 56... Station boiler condensate return pipe, 57... Receiver set, 5
8... Pump, 59... Station boiler steam pipe, 60... Station boiler condensate return pipe, 61... Make-up water pipe, 62... Evaporator heating steam pipe, 63... Control valve, 64... Evaporator,
65...Steam pipe, 66...Steam control valve, 67...Evaporator.

Claims (1)

[Claims] 1. A first evaporator and a first evaporator in the first evaporator.
a first steam pipe connected to the high-temperature side piping of the reactor and guiding steam generated in the reactor; a first condensate pipe connected to the downstream side of the first high-temperature side piping; and the first evaporator. a second steam pipe connected to the second high-temperature side piping of the station and guiding steam from the in-house boiler; a first condensate return pipe connected to the downstream side of the second high-temperature side piping; a second condensate return pipe from the in-house equipment connected to the first low-temperature side in the first evaporator; and a third condensate return pipe connected to the first low-temperature side and led out to the in-house equipment.
An in-house heating steam supply device comprising a steam pipe. 2 a first evaporator and a first evaporator in the first evaporator;
a first steam pipe connected to the high-temperature side piping of the reactor and guiding steam generated in the reactor; a first condensate pipe connected to the downstream side of the first high-temperature side piping; and the first evaporator. a second condensate return pipe from the in-house equipment connected to the first low-temperature side of the station, a second steam pipe connected to the first low-temperature side and led out to the in-house equipment, and this second steam a second evaporator having a second low temperature side connected to the pipe and the second condensate return pipe; and a station boiler connected to the second high temperature side pipe in the second evaporator. An in-house heating steam supply device comprising: a third steam pipe for guiding steam from the pipe; and a third condensate return pipe connected to the downstream side of the second high-temperature side pipe. 3 a first evaporator and a first evaporator in the first evaporator
a first steam pipe for guiding the steam generated in the nuclear reactor connected to the high temperature side piping; a first condensing pipe connected to the downstream side of the first high temperature side piping; and the first evaporation pipe. a second steam pipe connected to a second high-temperature side pipe in the vessel and guiding steam from the in-house boiler; a first condensate return pipe connected to the downstream side of the second high-temperature side pipe; and the above-mentioned a second condensate return pipe from in-house equipment potentially contaminated with radioactivity connected to the first low-temperature side in the first evaporator; and a radioactive return pipe connected to the first low-temperature side. 3rd place to equipment in the facility that may be contaminated
a third high-temperature side to which a steam pipe, a fourth steam pipe branched from the third steam pipe, and a third condensate return pipe branched from the second condensate return pipe are connected; a second evaporator having a pipe interior, a fourth condensate return pipe from in-house equipment connected to the second low temperature side of the second evaporator and having no possibility of radioactive contamination; a fifth steam pipe connected to the low-temperature side of No. 2 to in-house equipment with no possibility of radioactive contamination, and a sixth steam pipe connected to this fifth steam pipe and leading steam from the above-mentioned in-house boiler. and a fifth condensate return pipe to the in-house boiler connected to the fourth condensate return pipe.