JPS63214600A - Feeding device for instrument compressed air - Google Patents

Abstract

PURPOSE:To feed the desired instrument compressed air to a plant even if an operating machine and a spare machine are functionally stopped concurrently by monitoring the inlet side pressure and the outlet side pressure of a dehumidifier. CONSTITUTION:The instrument compressed air fed from instrument compressors 1a or 1b is connected to a dehumidifier 4 through an air storage tank 3. A bypass pipeline 8 is arranged on the dehumidifier 4, and a dehumidifier bypass valve 9 is provided on the bypass pipeline 8. A dehumidifier inlet pressure detector 10 outputs the inlet pressure normal signal S10 indicating that the inlet pressure is the preset fixed pressure or higher and normal. On the other hand, a dehumidifier outlet side pressure detector 11 outputs a signal to open the bypass valve 9 when the outlet side pressure of the dehumidifier 4 becomes the preset value or lower.

Description

Detailed Description of the Invention [Objective of the Invention j (Industrial Application Field) The present invention relates to a compressed air supply device for instrumentation, and particularly to a dehumidification device equipped with a plurality of dehumidifiers, in which all the dehumidifiers This invention relates to a bypass function for securing desired instrumentation compressed air even if the function is lost.

(Prior art) For example, a compressed air supply system for instrumentation at a nuclear power plant (hereinafter referred to as I
A dehumidifier has been installed to dehumidify the compressed air in order to smooth the operation of instrumentation and t+no equipment. Such a dehumidifying device usually has two series, each of which is equipped with a dehumidifier, and during operation, one series is operated as a regular unit, and the other series is used as a standby unit.

In the above configuration, if a device failure occurs when switching from the regular unit to the standby unit, the dehumidifier artificial valve may close simultaneously and the operation of both the regular unit and the standby unit may be stopped.
It is also expected that the regular equipment and the standby equipment will lose their functions at the same time due to operator error, etc. In such a case, l
Due to the pressure drop in A11li, the desired compressed air for instrumentation may not be supplied to the plant, and the integrity of the plant may be impaired.

(Problems to be Solved by the Invention) In the conventional configuration as described above, if the regular equipment and the standby equipment stop functioning at the same time, the pressure in the IA equipment will drop, resulting in a plant failure. There is a problem that the soundness is damaged, and the present invention was made based on this point, and its purpose is to prevent the failure of the main unit and the standby unit at the same time. An object of the present invention is to provide a compressed air supply device for instrumentation that can supply desired compressed air for instrumentation to a plant and ensure the health of the plant.

[Structure of the Invention] (Means for Solving the Problems) That is, the instrumentation compressed air supply device according to the present invention includes a plurality of instrumentation air compressors installed and compressed air supplied from these instrumentation air compressors. an air storage tank for storing air; a dehumidifier in which a plurality of dehumidifiers are arranged in parallel to dehumidify compressed air from the air storage tank; and a compressed air system for in-house instrumentation connected to the inlet side of the dehumidifier; a bypass pipe bypassing the dehumidifier and having a bypass valve; a dehumidifier inlet pressure detection means for detecting the pressure at the inlet of the dehumidifier; and a dehumidifier outlet for detecting the outlet pressure of the dehumidifier. side pressure detection means, an inlet pressure normal signal outputted from the dehumidifier inlet side pressure detection means and indicating that the inlet pressure is higher than a preset low pressure, and an outlet pressure low signal outputted from the dehumidifier outlet pressure detection means. The present invention is characterized by comprising: an equipment control device which inputs and opens the bypass valve.

(Function) In other words, the pressure on the inlet and outlet sides of the dehumidifier is monitored by the dehumidifier inlet pressure detection means and the dehumidifier outlet pressure detection means, and the inlet pressure normal signal from the dehumidifier inlet pressure detection means and the dehumidifier By inputting both the outlet pressure low signal from the outlet side pressure detection device, the bypass valve is opened via the equipment control device, and instrumentation compressed air from the in-house instrumentation compressed air system is supplied to the plant. be.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a diagram showing the configuration of an IA device according to this embodiment, and reference numerals 1a and 1b in the figure are instrumentation compressors. Compressed air constituted by this instrumentation compressor 1a or 1b is stored in an air storage tank 3 via a pipe 2. A dehumidifier is connected to the air storage tank 3 via a pipe 3a. Two dehumidifiers 5a and 5b are arranged in parallel on this dehumidifier, and these two dehumidifiers! Dehumidifier inlet valves 6a and 6b are inserted on the inlet sides of 15a and 5b, respectively. A pipe 7 is connected to the outlet sides of the dehumidifiers 5a and 5b. Further, a bypass pipe 8 is attached to the dehumidifier A-, and a dehumidifier bypass valve °9 is inserted into the bypass pipe 8. A dehumidifier inlet side pressure detector 10 is inserted into the bypass piping 8 on the primary side of the dehumidifier bypass valve 9 . In addition, the pipe 7
A dehumidifier outlet side pressure detector 11 is inserted in the dehumidifier.

The dehumidifier inlet side pressure detector 10 outputs an inlet pressure normal signal 810 indicating that the inlet pressure is normal at a preset low pressure or higher; This means that compressed air for instrumentation can be supplied on the inlet side of the dehumidifier 1114. On the other hand, the dehumidifier outlet side pressure detector 11 outputs an outlet pressure low signal 811 when the outlet side pressure of the dehumidifier reaches a preset value or less. These detection signals s10 and S11 are input to the device IIJiIl device 12, and this device control device 12 outputs a bypass valve opening command signal 812 to the bypass valve 9 when these two signals are input. The fact that both of the above two detection signals s10 and 811 are output means that the pressure on the outlet side of the dehumidifier A- does not rise even though the inlet side of the dehumidifier A- is in a healthy state. This means that the upper part has lost its function.

Further, an S-A backup valve 14 is connected to the pipe 4 via a pipe 13. Note that S-A here indicates in-house compressed air. That is, the pressure detector 1 on the inlet side of the dehumidifier
The inlet and outlet pressures are monitored by the 0 and dehumidifier outlet pressure side detectors 11, and the bypass valve 9 is opened as appropriate, and the S/A backup valve 14 is opened to bypass the compressed air for in-house instrumentation. It is supplied to the plant via piping 8.

Next, the configuration of the device control device 12 will be explained in detail with reference to FIG. 2. First, when an operation switch installed on a control panel (not shown) is operated to fully open the operation switch (indicated by reference numeral 15), a bypass valve opening command signal 812 is outputted via the OR circuit 16. By the output of this bypass valve opening command signal 812, the bypass valve 9 is fully opened. Accordingly, the limit switch of the bypass valve 9 is fully opened and a bypass valve opening signal s18 is output. By outputting this bypass valve open signal s18, a bypass valve open alarm signal 819 is output, which alerts operators near the control panel of the valve status! ! ! Make them aware. This is because when the bypass valve 9 is opened to perform bypass operation, since the dehumidification IIL is not passed through, it is necessary to operate while monitoring the dew point meter. The above is a case where the bypass valve 9 is forcibly opened by the operation switch.

In contrast, a configuration for automatically opening the bypass valve 9 based on signals from the dehumidifier inlet side pressure detector 10 and the dehumidifier ratio 0 side pressure detector 11 will be described. First, the operating switch is in the automatic open position (indicated by the reference numeral 20). Then, the AND circuit 23 is established by outputting both the inlet pressure normal signal 81G from the dehumidifier inlet side pressure detector 10 and the outlet pressure low signal 811 from the dehumidifier outlet side pressure detector 11. As a result, a signal 824 is output and the AND circuit 25 is established.

As a result, the bypass valve automatic opening signal $26 is output to OR circuit 2.
7 and outputs a bypass valve opening command signal 812 via the OR circuit 16. This allows the bypass valve 9
The valve is opened and bypass operation is performed. Note that the bypass valve automatic opening signal 826 is self-held by the self-holding circuit 28. Here, the operator is responsible for self-holding the dehumidifier A.
This is because it is necessary to cancel bypass operation after fully confirming the soundness of -.

A reset signal for the self-holding circuit 28 is generated by returning the operation switch to the all position (indicated by reference numeral 29),
This releases self-retention. As mentioned above, the operator needs to check the health of the dehumidifier before doing so.

The operation will be explained based on the above configuration. Compressed instrumentation air compressed by two series of instrumentation compressors 1a and 1b is supplied to the air storage tank 3, and the operation of the instrumentation compressors 1a and 1b is controlled by the pressure of the air storage tank 3. Ensure pressure within a certain range. If both the instrumentation compressors 1a and 1b stop and the pressure inside the air storage tank 3 drops, the S-A backup valve 14 is opened to perform backup using an in-house compressor (not shown). receive.

Also, simultaneous closing of dehumidifier inlet valves 6a and 6b, or dehumidifier 5a
, 2 lines of dehumidifier 5 due to equipment failure or pipe breakage, etc.
A case where both a and 5b lose their functions will be explained. In that case, the dehumidifier pressure low signal 811 from the dehumidifier outlet side pressure detector 11 and the inlet pressure normal signal 81G from the dehumidifier inlet side pressure detector 10 are sent to the equipment control device 12.
As a result, the device control device 12 outputs a bypass valve opening command signal 812 to the bypass valve 9 .

By this, the bypass valve 9 is opened. As a result, compressed air from SA is supplied via the pipe 13 and the bypass pipe 7, and the health of the plant is maintained.

According to this embodiment, the following effects can be achieved.

(2) That is, even if the two dehumidifiers 5a and 5b both lose their functions, the desired supply of instrumentation compressed air is maintained, and the health of the plant is therefore not impaired. In other words, the dehumidifier outlet pressure low signal 811
Since the bypass valve 9 is opened via the matua device 12 based on the AND condition with the dehumidifier inlet pressure normal signal 810, the S.
This is because it is possible to receive backup from A.

Therefore, the burden on workers is significantly reduced, and
It is also possible to improve the operating rate of the plant.

■Also, the above device control device is equipped with a self-holding circuit 28, and is configured to continue bypass operation unless the operator fully confirms the health of the dehumidifier 4 and performs a reset operation, resulting in high safety. can provide sex.

〔Effect of the invention〕

As detailed above, according to the compressed air supply device for instrumentation according to the present invention, it is possible to supply desired compressed air for instrumentation even when both the regular and standby dehumidifiers have lost their functions. It has great effects, such as being able to maintain the health of the plant.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are diagrams showing one embodiment of the present invention.
This figure shows the configuration of the instrumentation compressed air supply device, and FIG. 2 is a diagram showing the configuration of the equipment III device. 1a, 1b...Instrumentation air compressor, 3...Air storage tank, 4-...Dehumidifier, 5a, 5b・I? Humidity 11.6a,
6b...Dehumidifier artificial valve, 8...Bypass piping, 9.
...Bypass valve, 10...Dehumidifier inlet pressure detector,
DESCRIPTION OF SYMBOLS 11... Dehumidifier outlet pressure detector, 12... Equipment control device, 14... S-A backup valve.

Claims (2)

[Claims] (1) A plurality of instrumentation air compressors installed, an air storage tank that stores the compressed air supplied from these instrumentation air compressors, and a plurality of dehumidifiers arranged in parallel to collect the compressed air from the air storage tank. a dehumidifying device that dehumidifies the air, a compressed air system for in-house instrumentation connected to the inlet side of the dehumidifying device, a bypass piping that bypasses the dehumidifying device and is equipped with a bypass valve, and a pressure on the inlet side of the dehumidifying device. a dehumidifier inlet pressure detection means for detecting the dehumidifier inlet pressure; a dehumidifier outlet pressure detection means for detecting the outlet pressure of the dehumidifier; A device control device that opens the bypass valve by inputting a normal inlet pressure signal indicating that the pressure is above a low pressure and a low outlet pressure signal from the dehumidifier outlet pressure detection means. Wearable compressed air supply device. (2) The instrumentation compressed air supply device according to claim 1, wherein the device control device includes a self-holding circuit for continuing bypass operation.