JP3106008B2 - Condensate supply equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a condensate supply system suitable for a nuclear power plant and the like, and more particularly to a condensate water supply system capable of independently monitoring the water quality of only condensate stored in a condensate storage tank. About.

[0002]

2. Description of the Related Art Conventionally, as an example of this type of condensate water supply equipment, there is one configured as shown in FIG. This is applied to a nuclear power plant. The condensate storage tank 1 is connected to each load 3 through a water supply pipe 2, and a transfer pump 4 is provided in the water supply pipe 2, At a junction A on the upstream side, a CRD (control rod drive system) water supply pipe 6 is connected via a connecting pipe 5 to a midway, and a condensate desalination device 7 is connected to the CRD water supply pipe 6.

The condensate from the condensate storage tank 1 is indicated by a solid line arrow in FIG.
After being mixed with a part of the return water (indicated by a broken line arrow in the figure) and mixed, the pressure is increased by the transfer pump 4 and supplied to each load 3.

[0004] Part of the makeup water supplied to each load 3 is collected at the sampling point B of the water supply pipe 2 and returned to the return pipe 8, and passes through the gate valve 9 and the water quality monitoring facility 10 which are open. Water is monitored for water quality, and the return water is returned to the return point C of the water supply pipe 2 again.

Therefore, in the water quality monitoring equipment 10, a part of the makeup water supplied to each load 3 is sampled at the sampling point B, and its water quality is detected and monitored. The quality of the makeup water can be detected and monitored.

[0006]

However, in such a conventional condensate water supply system, when the water quality of only the condensate in the condensate storage tank 1 is independently detected and monitored, for example, a drain pipe (not shown) is used. For example, it is necessary to directly collect the stored water and detect and monitor the quality of the stored water using such a method.

Accordingly, the present invention has been made in view of such circumstances, and an object thereof is to easily and independently monitor the water quality of only the condensate stored in the condensate storage tank. It is to provide a condensate supply facility.

[0008]

The present invention is configured as follows to solve the above-mentioned problems.

[0009] A water supply pipe for supplying condensate stored in the condensate storage tank to a load, a transfer pump interposed in the water supply pipe, and a junction of the water supply pipe upstream of the transfer pump. And a connecting pipe for connecting a part of the return water from the condensate desalination device to this junction, and a return point on the downstream side and the upstream side of the transfer pump in the water supply pipe. In a condensate replenishment facility having a return pipe and a valve and a water quality monitoring facility for monitoring water quality, the return point is provided upstream of the junction.

[0010]

First, when monitoring the quality of makeup water, which is a mixture of condensate stored in a condensate storage tank and return water from a condensate desalination device, and which is supplied to each load. Operate the transfer pump and open the gate valve.

Then, the condensate from the condensate storage tank and a part of the return water from the condensate demineralizer join and mix at the junction of the water supply pipe, and the mixed water is further transferred by the transfer pump 15. After the pressure is increased, water is supplied to each load.

A part of the makeup water is sampled from the sampling point of the water supply pipe and flows into the water quality monitoring equipment, where the water quality is detected and monitored, and the return water is returned to the return point of the water supply pipe. .

On the other hand, when monitoring the quality of only the condensed water stored in the condensate storage tank, the gate valve is closed during the operation of the transfer pump.

[0014] Then, the discharge pressure of the transfer pump is no longer applied to the gate valve side of the water quality monitoring equipment, and a part of the return pipe flows backward from the return point of the water supply pipe due to the hydrostatic head pressure of the condensate storage tank. The water flows into the water quality monitoring device 22, and the water quality is detected and monitored.

Therefore, according to the present invention, it is possible to easily detect and monitor the quality of only the condensed water stored in the condensate storage tank as well as the quality of the replenishing water supplied to each load. Can be.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a system configuration diagram of an embodiment of the present invention. In the figure, a condensate supply facility 11 is applied to, for example, a nuclear power plant and the like, and a condensate storage tank for storing condensate. 12 is connected to each load 14 via a water supply pipe 13, and a transfer pump 15 is interposed in the middle of the water supply pipe 13.

At the junction A ₀ upstream of the transfer pump 15, the water supply pipe 13 is connected to the CRD via a connecting pipe 16.
(Control rod drive system) It is connected to the middle of the water supply pipe 17.

The CRD feed pipe 17 is connected to a condensate desalination device 18 and has a CRD pump 19 interposed in the middle thereof, and a part of the return water from the condensate desalination device 18 is indicated by a dashed arrow in the figure. It is adapted to water at the confluence point a ₀ of the feed water pipe 13 as shown by.

At the water sampling point B ₀ downstream of the transfer pump 15, the water supply pipe 13 has an inlet end 20 a of the return pipe 20.
And the outlet end 20b of the return pipe 20 is connected at a return point C ₀ upstream of the junction A ₀ of the water supply pipe 13, and in the middle of the return pipe 20, from the water sampling point B _0. Toward the return point C ₀ , the gate valve 21 and the water quality monitoring equipment 22 for detecting and monitoring the water quality are interposed in this order. The water quality monitoring equipment 22 is provided with a drain line 24 for draining the drain to a drain pit 23.

That is, the condensate replenishment facility 11 is characterized in that the return point C ₀ of the water supply pipe 13 is provided upstream of the junction A ₀ .

Next, the operation of this embodiment will be described with reference to FIGS.

First, a mixture of the condensate stored in the condensate storage tank 12 and a part of the return water from the condensate desalination device 18, and the make-up water supplied to each load 14. When monitoring the water quality, the transfer pump 15 is operated to open the gate valve 21 as shown in FIG.

Then, the condensed water from the condensed water storage tank 12 and a part of the returned water from the condensed water desalination device 18 and the connecting pipe 16 are joined and mixed at the junction A ₀ of the water supply pipe 13, Further, the pressure is increased by the transfer pump 15 and then supplied to each load 14.

Further, a portion of the makeup water is water sampling into the pipe 20 back through the inlet end 22a from water sampling point B ₀ of the feed water pipe 13, further water quality monitoring equipment via the gate valve 21 in the opening 22 After the water quality is detected and monitored here, the flow returns to the return point C ₀ of the water supply pipe 13 again, and thereafter, each load 14 is supplied through the water supply pipe 13.

On the other hand, when detecting and monitoring the water quality of only the condensate in the condensate storage tank 12, as shown in FIG.
The gate valve 21 is closed while 5 is operating.

Then, the inlet end 22a of the water quality monitoring equipment 22
On the other hand, since the discharge pressure of the transfer pump 15 is no longer increased, the hydrostatic head pressure of the condensate storage tank 12 causes
Only the condensate is, as shown in solid arrows in the drawing, and flows back through the outlet end 20b of the pipe 20 returning from the return point C ₀ flows into the water quality monitoring equipment 22 monitors here detects the water quality, after this Is discharged to the drain pit 23 through the drain line 24.

At this time, a part of the return water from the condensate desalination unit 18 returns from the condensate desalination unit 18 because the return point C ₀ of the water supply pipe 13 is located upstream of the junction A _0. It is possible to prevent a part of the water from flowing backward from the junction A ₀ to the return point C ₀ and to mix, and to monitor the water quality of the condensate storage tank 12 alone.

Therefore, according to the present embodiment, each load 14
The water quality of only the condensate from the condensate storage tank 12 can be detected and monitored by a simple operation of simply closing the gate valve 21 during the operation of the transfer pump 15 while detecting and monitoring the quality of the make-up water supplied to the condensate storage tank 12. It can be easily detected and monitored.

[0030]

As described above, according to the present invention, the return point of the water supply pipe for returning the return water from the water quality monitoring equipment is determined by the return of the condensate storage tank and the return water from the condensate desalination device. Is provided upstream of the confluence point where the water is condensed and mixed, and condensed water from the condensate storage tank and part of the return water from the condensate The water quality monitoring system can detect and monitor part of the make-up water supplied to the condensate tank, and the simple operation of simply closing the gate valve during the operation of the transfer pump can reduce the water quality of the condensate storage tank only. Water quality monitoring equipment can easily detect and monitor alone.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of one embodiment of a condensate water supply facility according to the present invention.

FIG. 2 is a system configuration diagram showing an operation state when the water quality of only the condensate from the condensate storage tank is detected and monitored independently in the embodiment shown in FIG.

FIG. 3 is a system configuration diagram of a conventional condensate water supply facility.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 Condensate replenishment equipment 12 Condensate storage tank 13 Water supply pipe 14 Load 15 Transfer pump 16 Communication pipe 17 CRD (control rod drive system) water supply pipe 18 Condensate demineralizer 19 CRD pump 20 Return pipe 21 Gate valve 22 Water quality monitoring equipment A ₀ junction B ₀ water sampling point C ₀ return point

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G21D 1/00-1/02 F01D 25/32 G21C 7/16 G21C 17/02

Claims (1)

(57) [Claims] 1. A water supply pipe for supplying condensed water stored in a condensate storage tank to a load, a transfer pump interposed in the water supply pipe, and a junction of the water supply pipe upstream of the transfer pump. A communication pipe connected at a point to feed a part of the return water from the condensate desalination device to this junction, and a return point on the downstream side and the upstream side of the transfer pump in the water supply pipe, respectively. A condensate replenishment facility having return pipes each interposed with a gate valve and a water quality monitoring facility for monitoring water quality, wherein the return point is provided upstream of the junction. Facility.