JPS5886602A - Air system for instrumentation - Google Patents

Abstract

PURPOSE:To monitor and detect a fault easily and speedily and to improve the safety of the operation of a plant by providing an air receiver equipped with a pressure gauge, a remote operating valve, a flowmeter, a monitoring device for its measured value, and a display device. CONSTITUTION:A monitoring device 15 inputs a signal S1 from a pressure gauge 12 and outputs its variation to a display device 17 successively. The monitoring device 15 inputs flow rate signal S2 and outputs the state of supply piping 10 to the display device 17. This device 17 displays equipment 11 according to priority, and also displays the difference in the air supply amount of the supply piping 10 between a normal and a present point. As the pressure drops to a lower limit, an operator isolates the equipment 11 which exerts less influence upon a plant through a remote operating device 16 from said display, and thus reduces the pressure loss in the air receiver 5. When the remote operating device 16 closes a motor-driven valve 13, or when a broken position, etc., is repaired during said period, the pressure in the air receiver 5 recovers.

Description

[Detailed description of the invention] The present invention relates to instrumentation air systems.

Generally, many air-operated valves are used in nuclear power plants, chemical plants, etc., and these plants are also equipped with many air-controlled flow control devices. An instrumentation air system is provided to supply air to air-operated valves and flow control equipment.

Figure 1 shows such an instrument air system. In the figure, the reference numeral 1 indicates air that has a small f-lux, passes through a noirta, is compressed by a compressor 2, and is cooled by an I lid 9-ra 3. After that, the air is sent to the air receiver 5 through the reverse 11 valve 4. In the figure, symbols 1a, 2a, 3a, and 4a each indicate a system for the Pack No. The capacity is right. Baka switch 16 is attached to the F end of air receiver 5 [
If the internal pressure of the air receiver 5 falls below the preset pressure, an alarm will be output to an alarm (not shown).
does not have the function of continuously measuring pressure.

Downstream of the air receiver 5 is a dehumidifier 7.7a with two
are connected in parallel, and the air coming out of this air receiver 5 is dehumidified in a dehumidifying station 7, and then passes through an air supply main pipe 8 to a supply pipe 10 in which a manual valve 5) for on-site use is inserted. is transferred to various devices 11 through.

In addition, a dehumidifier is shown in the figure! A dehumidifying device M7a arranged in parallel with 7 is a backup dehumidifying device. Also, in this embodiment, four pipes are shown as the supply pipes 10, but in an actual plant, there are many more supply pipes 10.
is installed.

In the instrumentation air system configured as described above, if the air pressure decreases due to a failure of the compressor 2 or the dehumidifier 17, an abnormality in the power supply, or damage to the piping, various equipment 1
All of the air-operated valves (not shown) provided in 1 are opened, closed, or left as they are based on fail-safe considerations.

However, in the instrument air system configured as described above, the equipment 11 that does not affect the health of the plant is
Moreover, since the air receiver 5 is provided, a phenomenon in which the air pressure suddenly decreases is unlikely to occur. Therefore, if a situation occurs in which the air pressure cannot be maintained above the set value, it is necessary to immediately select in advance equipment 11 that will not affect plant operation even if the air is dropped, and isolate these equipment 11. By doing so, the decrease in air pressure in the entire instrumentation air system is slowed down, and the influence on the important equipment 11 can be minimized.

Also, by repairing the abnormal area during this time, it is possible to prevent the replant from stopping. .

However, in the above-described human air system, the valves inserted in the supply piping 10 are electrically operated valves 9, so it takes a lot of time to isolate the equipment 11 systems, and it also takes a lot of time. There is a possibility of an error in the opening/closing operation.

Furthermore, in the above-described public air system, if a rupture occurs in the supply piping 10, which supply piping 10
It is very difficult to detect whether the air is broken, and the pressure switch 6 provided in the air receiver 5 cannot continuously monitor the pressure.

The present invention has been made to address such conventional problems, and includes an air receiver equipped with a pressure gauge a for storing air compressed by a compressor, and an air receiver equipped with a pressure gauge a for storing air compressed by a compressor. A plurality of interposed supply pipes of remote control valves and flow meters supplying various devices, and the pressure i! Input the measured values of 1 and flow 1 meter and output these values Ii1
? J2S:=7/, -1 An instrumentation air system characterized by comprising a display device that displays the values output from the VU-SIR is 1! This is what we are trying to provide.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to an embodiment shown in the drawings. In FIG. 2, parts common to those in FIG. 1 are given the same reference numerals.

In Figure 2, there is a pressure gauge 1 at the upper end of the air receiver 5.
2, a motor-operated valve 13 is arranged in the supply pipe 10, and a flow meter 14 is inserted downstream of the motor-operated valve 13, respectively. Further, in the figure, reference numeral 15 indicates a monitoring device, and this monitoring device 11f15 includes a pressure gauge 12.
Pressure signal S+ from the flow meter 14 and flow rate signal 82 from the flowmeter 14
is input. Further, the electric valve 13 is electrically connected to a remote control device f16 for remotely controlling the electric valve 13.

In other words, W/M? j! The device 115 inputs the pressure signal S+ from the pressure gauge 12, and outputs changes in the pressure signal S+ to the display device 17 over time as shown in FIG.

In Fig. 3, time 1 is plotted on the horizontal axis and pressure P is plotted on the vertical axis, and the horizontal C curve a represents the air receiver.
5 shows the lower limit value set in advance in the air receiver 5.

Further, the monitoring device 15 inputs the flow rate signal S2 from the flow meter 14 and outputs the state of the supply pipe 10 to the display device 17 as shown in FIG.

In other words, in Figure 4, the horizontal axis shows 111 levels of importance.
11 (A, B, C, D with decreasing importance) are listed in order from the left, and the vertical axis is the supply arrangement! The difference between the normal air supply amount of 10 and the current air supply amount is taken. Machines 111 indicated by A and D in the figure indicate that the supply amount is increasing, and the graph extends in the positive direction. Further, C indicates a state in which, for example, a break has occurred in the supply pipe 10, and the supply amount has increased abnormally.

In the instrumentation air system configured as described above, as shown in Fig. 3, if an abnormality occurs in the pressure at time I, for example, and the pressure starts to decrease toward the lower limit, the operator must From the display in FIG. 4, it is possible to isolate the equipment 11 that has little influence on the plant using the remote control device 16, and easily reduce the rate of pressure drop in the air receiver 5.

Then, when the electric valve 13 is closed by the remote control device 16, or when the broken part in the temple is repaired, the internal pressure of the air receiver 5 decreases at time t3 as shown in FIG. Return to original state.

Note that the electric valve 13 is opened and closed by an operator operating a remote control @ position 16. Further, the display device 17 is composed of, for example, a color CRT.

As described above, according to the instrumentation air system of the present invention, the occurrence of an abnormal accident within the instrumentation air system can be detected in the ninth period. In addition, it is possible to quickly provide operators with estimates of the causes of accidents and countermeasures, and it is possible to significantly improve the reliability and operation rate of various plants.

[Brief explanation of drawings]

Fig. 1 is a piping system diagram showing an example of a conventional four-equipment air system, Fig. 2 is a piping system diagram showing an example of the instrumentation air system of the present invention, and Figs. 3 and 4 are illustrations. It is a dimensional explanatory diagram showing the contents displayed on the device. 2・・・・・・・・・・・・・・・Compressor 5・・・・・・
・・・・・・・・・Air receiver-10・・・・・・
・・・・・・・・・Supply piping 11・・・・・・・・・・
・・・・・・Equipment 12・・・・・・・・・・・・・・・
Pressure 113......Motorized valve 14
・・・・・・・・・・・・Flowmeter 15・・・・・・
......Monitoring device 17...
・・・・・・Patent attorney for display devices Sasa Suyama
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Claims (1)

[Claims] An air receiver with a pressure i1 for storing air compressed by a compressor, and a remote control valve and a flow meter inserted to supply the air stored in this air receiver to each device. A supervisor that inputs the plurality of supply pipes and the measured values of the pressure 81 and flow meter and outputs these values. An instrumentation air system comprising an M device and a display device that displays values output from the monitoring device.