JPH01161199A - Compressed air supplying device for instrumentation - Google Patents

Abstract

PURPOSE:To back up adjacent plants to each other by providing 1st and 2nd air compressors, 1st and 2nd air storage tanks, etc., and providing a tie line connecting two pieces of 1st and 2nd bypass lines and bypass stop valves to the title device. CONSTITUTION:A pressure switch 30 which is so set as to operate at a specified pressure value or below operates to open pneumatic valves 23 and 24 when two units of the air compressors 1A of, for example, the plant A are disabled. The pressure of the air storage tank 10A of the plant B drops upon opening of the valves 23 and 24 and, therefore, the signal for operating two units of the air compressors 8A, 9A is sent from the storage tank 10 so that the two-unit operation is carried out. Of the 200% capacity generated by the two-unit operation of the compressors 8A, 9A, the 100% capacity is supplied from a bypass line 21A of a dehumidifier through the tie line 22 to the dehumidifier 4A from the tie line 20 of the dehumidifier of the plant A. The capacity of the dehumidifiers 4A is 100% per unit and the compressed air of the 100% capacity subjected to dehumidification and dust removal is supplied to the consuming point of the plant A.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a compressed air supply device for side bags in a nuclear power plant.

(Prior art) The instrumentation compressed air system is a system whose purpose is to supply oil-free, dehumidified, and dust-removed compressed air mainly for the operation of air-operated valves and H1-equipped control equipment. It is.

The system configuration of the instrumentation compressed air supply device is shown below.

This system has two compressor trains in parallel, and each train consists of an intake filter and muffler, an air compressor, a rear cooler, a steam separator, and piping connecting them. After each steam separator, the compressed air is combined and supplied to each user through an air storage tank and a dehumidifier.

Details of the flow of compressed air from air intake to supply to each usage load light will be described below.

The air that has passed through the suction filter/silencer is sucked into the air compressor. During normal plant operation, it is supplied by one compressor.

The air pressurized by the air compressor is cooled by the rear cooler because the temperature of the gas rises to - at the same time as the air is pressurized.

At this time, the moisture in the compressed air condenses to generate condensed water, which is removed by a steam separator. After the steam separator, the compressed air is dehumidified via an air storage tank, and at the outlet of the dehumidifier, the dew point of the compressed air is lowered to a predetermined temperature or lower, and dust is removed so that it does not contain particles larger than a predetermined size.

Through the above process, oil-free, dehumidified, and dust-removed compressed air is supplied to each user (equipment using compressed air).

The compressed air supplied by the instrumentation compressed air system is used to operate air-operated valves in various systems in nuclear power plants, etc. If this system stops during plant operation, the operations of Plan 1~ will stop. Resulting in.

As described above, the instrumentation compressed air supply system is an essential system during Plan 1 to operation.

Therefore, in consideration of the case where the instrumentation compressed air supply system stops functioning, a backup system is provided to supply compressed air from an adjacent plant to maintain the functionality of the instrumentation compressed air system.

A system 11 for supplying compressed air from an adjacent plant in a conventional instrumentation compressed air supply device will be described below with reference to the drawings.

As shown in FIG. 3, conventionally, there is a tie line 15 connecting the piping connecting the air storage tanks 3, 10 and dehumidifiers 4, 11 of each plant A, B, and a tie line 15 on the tie line. It consists of tie line stop valves 7 and 14 installed.

When the air compressors 1, 2 or the air storage tank 3 in plant A become unusable, the tie line stop valve 7.14 is opened by the operator. When the tie line stop valve 7°14 is opened, the pressure in the air storage tank 10 in plans 1 to B decreases, so
A signal is input from the air storage tank 10 to supply and operate two air compressors 8 and 9. Of the 200% capacity compressed air generated by the operation of the two air compressors 8 and 9, 100% capacity is supplied to the two dehumidifiers 4 of Plant A via the tie line 15, where it is dehumidified and dust removed. After that, it is supplied to each user.

At this time, in Plant B, the remaining 1.00% capacity of compressed air is supplied to each user through the normal operation route.

(Problem to be solved by the invention) Since the instrumentation compressed air supply system is a system that cannot be stopped during plant operation, if the instrumentation compressed air supply system becomes unusable, It must be possible to provide mutual backup with adjacent plans 1 to 1.

However, the conventional mutual backup system with adjacent plans 1 to 1 has the following problems.

In conventional tie lines, problems occur when both dehumidifiers in the instrumentation compressed air system supply equipment of the supplied plant become unusable.

[Structure of the invention]

(Means for resolving the problem) The tie line piping configuration was designed to ensure that the backup system functions even if both dehumidifiers of the instrumentation compressed air supply system become unusable. To provide a system that can automatically measure backup without requiring any operations from an operator.

(Function) Even if both dehumidifiers of the instrumentation compressed air supply system are unusable, it is possible to provide backup with an adjacent plant and to automatically start the backup system.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the mutual backup system 11 of the instrumentation compressed air systems of plant A and plant 13 includes dehumidifier bypass lines 20A and 2 of each plan 1 to 2.
1. The structure is such that the tie lines 22 are used to meet each other via A.

The function of the mutual backup system according to the present invention will be explained in the following case.

■If both air compressors IA or air storage tank 3A become unusable in plant A, if compressed air cannot be supplied downstream to air storage tank 3, they will operate below a certain pressure value. The set pressure switch 30 is activated and the air operated valves 23 and 24 are opened. When air-operated valves 23 and 24 are open, air reservoir 1. in plan I-+3. Since the pressure of the OA decreases, a signal to operate two air compressors 8A and 9A is sent from the air storage tank 10A, and the two units are operated. Of the 200% capacity compressed air generated by the operation of the two air compressors 4i8A and 9A, 1.00% capacity passes through the dehumidifier bypass line 2] A and the tie line 22 and connects to the ties of the dehumidifiers of Plans 1 to A. It is supplied from line 20A to dehumidifier 4A. Each dehumidifier 4A has a capacity of 100%, and the dehumidified and dust-removed compressed air with a capacity of 1,00% is supplied to each of the uses of the compressed air in Plan 1A.

■, When two dehumidifiers 3 become unusable in Plans 1 to A If both dehumidifiers 4A become unusable during normal operation in Plans 1 to A, a signal is sent from the dew point meter 31 to dehumidify the air. The actuated valve 27 is closed, the air actuated switching valve 25 is open, and the air actuated valve 26 in +3 to plan I is open and the air actuated valves 23, 24 are closed.

Plan 1 occurs when air operated valves 25 and 26 are open.
~I3 air storage tank], the pressure of OA decreases and air compressor 8
A and 9A operate two units. The compressed air of 200% capacity generated by the operation of these two units is transferred to two dehumidifiers],
], A (] - 1.00% capacity per unit) to dehumidify and remove dust.

100% of the 200% capacity compressed air that has been dehumidified and dust removed
The capacity is dehumidifier], ], bypass line 21B of A,
Tie line 22. The compressed air is supplied to the downstream side of the dehumidifier 4A via the bypass line 20B, and is supplied to each of the uses of the compressed air in Plans 1 to A.

As described in -1- above, this embodiment makes it possible to reliably receive the supply of compressed air from the adjacent plant in case of various cases where the instrumentation compressed air system equipment cannot be used. It becomes possible to automatically plan for mutual backup with the adjacent plans 1~.

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

The tie line piping configuration shown in FIG. 2 is an air storage tank 3A in the instrumentation compressed air system of each plant.

10A, the dehumidifier 4A, 1], the tie line 22A that connects between tie line 22
Air operated valve 2 installed on B and its tie line
It consists of 3B and 24B.

The piping configuration of this tie line also provides the same effect as that shown in the embodiment of the present invention described in -1-1! ) is possible.

Details of the case shown below in FIG. 2 will be explained.

(i) Air compressor in Plans 1 to A], A, 2
When two units A or the air storage tank 3A becomes unusable, when compressed air cannot be supplied to the downstream side of the air storage tank 3A, the pressure switch 30, which is set to operate below a certain pressure value, is activated, Tie line 22Al each plan 1
Air-operated valves 23A, 24A installed on each side
are in the open state. Air operated valve 23A, 24A
are in the open state, air storage tank 1 in plant B
Since the pressure at 0A decreases, a signal to operate is sent from the air storage tank 10A to the air compressors 8A and 9A, causing the two to operate. Of the 200% capacity compressed air generated by the operation of the two air compressors 8A and 9A, 100% capacity compressed air is supplied to the upstream side of the dehumidifier 4A of Plans 1 to A via the tie line 22A. . Dehumidifier 4A (1 unit per unit)
The 100% capacity compressed air that has been dehumidified and dust removed by the 00% capacity) is supplied to each of the compressed air usage locations in Plan IA.

(jj) In plant A, if both dehumidifiers 4A become unusable, a signal is sent from the dew point 31 and the air operated type at the inlet of dehumidifier 4A becomes unusable. The valve 27 is closed, and the air-operated valves 23B and 24B installed on the plan 1 side on the tie line 22B are each open (the air-operated valves 23A and 24A are closed). . When the air-operated valves 23B and 24B open, the pressure in the air storage tank 10A in Plan 1-B decreases, so the operation signal], 05 is sent from the air storage tank 10A to the air compressors 8A and 9A to stop the air. Compressor 8A, 9
A is in operation. The compressed air of 200% capacity generated by the operation of the two air compressors 8A and 9A is dehumidified by the dehumidifier 11A (
Dehumidification and dust removal are performed at 100% capacity per unit. Dehumidification.

Of the 200% capacity compressed air from which dust has been removed, 100% capacity is supplied to the downstream side of the dehumidifier 4A via the tie line 22B, and is supplied to each use of the compressed air in Plan 1A.

In addition to the above-mentioned cases, this embodiment can also reliably start a backup in the following cases.

(iii) in plant A, air compressor IA;
2A becomes unusable, or the air storage tank 3A becomes unusable, and furthermore, in Plans 1 to B, the dehumidifier 1. If two LAs become unusable, air storage tank 3 in plant A
When compressed air cannot be supplied to the downstream side of A, the pressure switch 30, which is set to operate below a certain pressure value, operates, and the air supply installed on each side of each plan 1 on the tie line 22A is activated. The actuated valves 23A and 24A are each in an open state.

In Plans i to B, the signal from the dew point M131 closes the air-operated valves 28 installed at the dehumidifier and IA inlets, respectively, and the air-operated valves 28 installed on each plant side of the tie line 22B close. pneumatically operated valves 23B, 24
B are each in an open state. In this state, plant B
Since the pressure in the air storage tank 10A decreases, a signal lO is sent from the OA to the air compressors 8A and 9A.
8 is sent, and both air compressors 8A and 9A operate. By operating two air compressors 8A and 9A, compressed air of 200% capacity is generated. The 200% capacity compressed air is supplied to the two dehumidifiers 4A in Plan IA via the tie line 22A. 100% of the 200% volume of compressed air dehumidified and dust removed by dehumidifier 4A in Plant A
The capacity is supplied to each user in Plan I-A, and the remaining 100% capacity is supplied to the downstream side of the dehumidifier 11A in Plant B via tie line 22B, and is supplied to each user in Plant B. be done.

〔Effect of the invention〕

As explained above, in the present invention, it is possible to reliably and automatically provide mutual backup with an adjacent plant in the event that the instrumentation compressed air supply device is unusable. This greatly contributes to improving the reliability of functions in air supply equipment.

4. Brief explanation of the drawings.

FIG. 1 is a schematic system diagram showing one embodiment of an instrumentation compressed air system according to the present invention, FIG. 2 is a schematic system diagram showing another embodiment of the invention, and FIG. 3 is a conventional instrumentation compressed air system. This is a system diagram of

LA, 2A, 8A, 9A...Air compressor 3A,
10A...Air storage tank 4A, ], LA...Dehumidifier 20, 20A, 20B, 21.21A, 21B
...Bypass line 22, 22A, 22B...Tie line 23, 23A, 23B, 24.24A,
24B, 25.25A, 26.26A...Air-operated valves 27, 28...Air-operated valves 30...Pressure switch 31/dew point meter Agent Patent attorney Noriyuki Chika Yudo Ken Daishimaru

Claims (1)

[Claims] (1) A first air compressor, a first air storage tank connected downstream of the first air compressor, and a first pressure switch connected downstream of the first air storage tank. a first air-operated valve connected downstream of the first air-operated valve; a first dehumidifier connected downstream of the first dehumidifier; and a dew point meter connected to the downstream side of the first dehumidifier. a first bypass line that bypasses the first air-operated valve and the first dehumidifier and has two bypass stop valves; a second air compressor, a second air storage tank connected downstream of the second air compressor, and a second air storage tank connected downstream of the second air storage tank via a second pressure switch. Second
an air-operated valve, a second dehumidifier connected downstream of the second air-operated valve, and a second dehumidifier connected downstream of the second dehumidifier via a dew point meter. equipment using compressed air in the plant, the second air-operated valve and the second air-operated valve.
a second bypass line that bypasses the dehumidifier and has two bypass line stop valves, and a second bypass line between the two bypass line stop valves of the first bypass line and two bypass line stop valves of the second bypass line. A compressed air supply device for instrumentation, comprising a tie line connecting a bypass line and a stop valve.