JPS6081600A - Burst plate device for preventing explosion hazard - Google Patents

Abstract

PURPOSE:To securely prevent a hermetically sealed device itself from being broken, by a method wherein when an explosion occurs in the interior of a hermetically sealed device, the explosion is detected, and a safety burst plate is bursted immediately and securely. CONSTITUTION:When an explosion occurs at the position of a heater 23 in a pressure vessel 1, light generated in the initial stage of the explosion is inputted into a photo-electric converting element in a photo-electric converting circuit 28a through an optical fiber 27a, so that a solenoid valve 17 is operated to make the pressure in an intermediate pressure chamber 16 equal to the atmospheric pressure, whereby the first burst plate 9 is immediately bursted. As a result, the second burst plate 10 is also bursted consecutively. Accordingly, the explosion pressure in the vessel 1 is released to a safe space through a release pipe.

Description

[Detailed Description of the Invention] [Technical Field] The present invention provides a system that, when an explosion occurs in a sealed device such as a pressure vessel or piping, ruptures a safety rupture disc and releases an explosion pressure horn. The present invention relates to a rupture disc device for suppressing explosion damage that prevents damage to the sealed device itself.

[Prior art]

Safety rupture discs are widely used in order to prevent damage to sealed equipment such as pressure vessels and piping when excessive internal pressure is applied to the equipment. It is used.

However, the pressure at which a rupture disc ruptures differs depending on whether the pressure in (a) is static pressure or dynamic pressure. In such a case, it has been confirmed by group research such as the present invention that the rupture disc does not rupture until a pressure considerably higher than that which would occur if static pressure were applied to the rupture disc.

Therefore, in the past, if an explosion occurred in a sealed device, despite the rupture disc type safety device being provided, the sealed casing would rupture.
t,,'U L often avoided causing serious accidents.

(Object of the Invention) The present invention has been made to solve the above-mentioned conventional drawbacks, and when an explosion occurs in a sealed device, L13 detects the explosion at the initiation of the explosion. However, it is possible to immediately rupture the safety rupture disc and reliably prevent damage to the sealed device itself.
The purpose of this paper is to provide a rupture disc system for suppressing the damage caused by drying.

(Summary of the Invention) The rupture disc material for light exposure and harm suppression 11 according to the present invention has one side connected to a space in a sealed device or a space communicating with the space, and A safety rupture disc, a second safety rupture disc whose one side is connected to a space in which the explosion pressure is to be released, and a second safety rupture disc which is in contact with a space communicating with said space, and a second safety rupture disc which has one side connected to a space in which the explosion pressure is to be released; an intermediate pressure chamber formed between the surface and the other surface of the second safety rupture disc and to which a predetermined internal pressure is normally applied; and a pressure lower than the predetermined internal pressure of the intermediate pressure chamber and the intermediate pressure chamber. an explosion detection means for detecting an explosion in the space inside the sealed device; When an explosion is detected, the valve includes a valve driving means for communicating the intermediate pressure chamber and the low pressure space, and when the explosion detection means detects an explosion, the valve driving means activates the valve. As the pressure in the intermediate pressure chamber decreases, the first rupture disc is in a state where it is likely to rupture, and in this state, the first safety rupture disc ruptures first, and then This is done so that the second rupture disc also ruptures.

〔Example〕

Hereinafter, the present invention will be explained based on the drawings and embodiments.

FIG. 1 is a cross-sectional view of an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view showing the vicinity of the corner of the rupture plate (=l fJ) in the embodiment. To explain based on
1 is the pressure vessel, 2 is the tightening (=J 4) member, 3°4.5
is a saw holder disposed between the pressure vessel 1 and the tightening chamber 2. The pressure vessel 1 includes implantable ports 1-7.
is installed, and this stud bolt 7 is tightened (
= J-shaped part 7/2"-, nut 8 is screwed together.

A first safety rupture disc 9 is interposed between the holters 3 and 4, and a second safety rupture disc 10 is interposed between the holters 4 and 5. Item 1 to 8
By tightening the ζ mouth J - each holster 3
It is held between 4 and 5, between 4 and 5. Here C1
Said rupture disc9. -10f7) The set bursting pressure (the pressure that compensates for the bursting of the rupture disc that undergoes constant depletion) is the same value PR.
The surface of the pressure vessel 1 side of the first rupture hole 9, which is said to be [It is in contact with the space 13 inside the force container 1]. The surface of the second rupture disc 10 opposite the pressure vessel 1 is connected to the hole 1 provided in the holster 5.
4J5 and the hole 15 provided in the tightening member 2, and the tightening member 2 are in contact with each other via a discharge pipe (not shown) connected to the tightening member 2.J3, the end of the discharge pipe is directed to an outdoor or other safe 4T location.

A space surrounded by the first rupture disc 9, the second rupture disc 10, and the inner peripheral surface of the boulder 4 constitutes an intermediate pressure chamber 16. 17 is a 3-bow solenoid valve, and an air supply port 18 of this solenoid valve 17 is connected to a suitable air pressure source (not shown). Note that the pressure supplied by the pneumatic source C1 is the intermediate value between the set bursting pressure of the safety rupture disc 9.10 and the popular Ifpo (i.e., PR>P2>Po). In addition, the 11th-119 of the electromagnetic piece 17 is opened to the intermediate pressure node A16, and the exhaust port 20 is opened to the exhaust pipe 21. The terminal end is placed in a safe place. 22 is a pressure 8 installed in the middle of the piping connecting the air IX source and the air supply 1-11ε3 of the electric light valve 17.
It is 1.

In thorns, in Figure 1, 23 kl, It-force vessel 1
A heater 24 installed inside the pressure joint i! ! + 1 is connected to the pipe, and 25 is a valve provided in the middle of the pipe 24. 26 is a pin 1 which converts the flow rate, temperature, pressure horn, etc. in the pressure horn container 1 into an electrical signal, and this sensor 26
The pressure is inserted into the circumferential wall of the container 1 in a state in which it passes through the circumferential wall.

27a, 27b, and 27c are optical fibers, and the tips of these optical fibers 27a to 27c are all located near the location where the explosion occurs in the pressure vessel 1. The tip of the optical fiber 27a is near the heater 23, and the tip of the optical fiber 27b is near the pipe 2.
An optical fiber 27c is connected near the connection part of the pressure vessel 1.
The tip of the lens is located near the sensor 26 ((1)) The heater 23 that generates heat and the electric spark generator 26 are the ignition source of the focused light. Furthermore, even if an explosion occurs in the part of the piping 24 that is far from the pressure vessel 1 due to the valve 25, the explosion will go through the valve 255 and into the pressure vessel 1 from the connection between the color scheme 24 and the pressure vessel 1. An explosion within the pressure vessel 1 is likely to be initiated at the connection C1 where the intrusion is likely to occur).
It goes without saying that the tips of the optical fibers 27a to 27G may be placed in locations where explosions are likely to occur, other than the heater 23 in the pressure horn container '1.

The ends of the optical fibers 27a to 27 are opposed to the light receiving portions of photoelectric conversion elements (not shown) such as transistors provided in the photoelectric conversion circuits 28a, 28b, and 28c, respectively.

Reference numerals 29a, 29b, and 29c are comparison circuits that turn on the outputs of the photoelectric conversion circuits 2'8a, 28b, and 28c when their outputs become higher than the reference voltage yt'er by more than a certain level. It has become.

In addition, in this embodiment, in J3, the optical fibers 27a to
27C1 photoelectric conversion circuits 28a to 28c, J5, and comparison circuits 29a to 29C constitute explosion detection means.

308.301), 30c is an electric (0 valve drive circuit),
When the outputs of the comparison circuits 29a, 29b, and 29c are A, the coil of the solenoid valve 17 is energized to operate the solenoid valve 17. Note that the photoelectric conversion circuits 28a to 28C1 comparison circuits 29a to 29c and the electromagnetic valve drive circuits 308 to 30C are installed in a safe place outside the pressure vessel 1.

Next, the operation of this embodiment will be explained.

In the first state of a3, the solenoid valve 17 is not energized, the air supply port 18 and the outlet 19 of the solenoid valve 17 are in communication with each other, and the intermediate pressure chamber 16 is connected through the solenoid valve 17. Connected to a pneumatic source. Therefore, the peak of the intermediate pressure chamber 1G is at P2.

Now, when an explosion occurs at the installation location of the heater 23 in the pressure vessel 1, the light generated at the initiation of the explosion passes through the optical fiber 27a to the photoelectric conversion element of the photoelectric conversion circuit 28a. Since the photoelectric conversion circuit 28a is used for
, more than a room! It becomes 1. As a result, the comparison circuit 29
The output of a is turned on, and the solenoid valve drive circuit 3Qa turns on the solenoid valve 17.
The electricity is turned on.

Then, the solenoid valve 17 is connected to the air supply port 18 and the 1F outlet 119.
I decided to shut off the space between the air n 8 I 7 + intermediate pressure chamber 16, and at the same time communicate between the air outlet 1 19 and the JJI air port 20. As a result, the intermediate pressure chamber 1G and the trachea 21 are communicated with each other. Therefore, the pressure in the intermediate pressure chamber 16 drops rapidly toward atmospheric pressure.

As a result, the pressure difference acting on both sides of the first rupture disc 9 increases, so that the first rupture disc 9 immediately ruptures. As a result, the pressure difference acting on both sides of the second rupture disc 10 also increases, so that the second rupture disc 1
0 continues and explodes.

At this time, the luminous pressure inside the pressure vessel 1 is released to a safe place via the discharge pipe connected to the tightening part 2 (see Figure 2), and the pressure inside the pressure vessel 1 is discharged to a safe place. Explosion damage 41. can be prevented.

And C1 tree device j! ? 'l' indicates that the pressure P2 is applied to the intermediate pressure chamber 1G in the normal 111, so only one rupture disc is installed between each pressure vessel 1;
It is possible to reduce the pressure difference that acts on both sides of each rupture disc 9 and '10 during normal operation.

Therefore, the set bursting pressure PR of each rupture disc 9, 10 can be lowered compared to providing only one rupture disc between the pressure vessel 1 and the container. That is, a rupture disc that is less strong and more easily ruptured can be used.

Therefore, even if an explosion is detected as shown in (above) and the pressure in the intermediate pressure chamber 16 is handled, it is necessary to ensure that the rupture discs 9 and 10 are ruptured before the pressure buildup due to the explosion progresses. te 8ru.

Even if an explosion occurs at the connection part between the piping 24 and the pressure vessel 1 or the installation part of the lens 26 and the IC is connected, the photoelectric conversion circuits 28b, 28c and the comparison circuit 29L, respectively)
, '29c, solenoid valve drive circuit 30b.

30G performs the same operation as in the case of the photoelectric conversion circuit 28a, comparison circuit 29a, and drive circuit 30a, so that the voltage vt! Valve 17 is operated to vent intermediate pressure chamber 16 to atmosphere and both rupture discs 9. 'IQ ruptured, pressure vessel 1
This will prevent you from seeing your own losses.

In addition, at the initiation of an explosion inside the pressure vessel 1, C
The wavelength of the emitted light varies depending on the type of gas contained within the pressure vessel 1. Therefore, the wavelength of the light generated varies depending on the individual situation in which this device is installed.
If a photoelectric conversion element provided in the pressure horn container 1 is used as a photoelectric conversion element having spectral sensitivity characteristics matching the wavelength of light expected to be generated at the initiation of an explosion in that case, At the same time, at the same time, the use of light to the optical fibers 27a to 27c due to explosions and other impediments (for example, for inspection, etc.) Pressure vessel 1 from inspection window etc.
(which occurs when light is irradiated into the interior) can now be precisely identified, and the device can be prevented from malfunctioning due to the large sword of light to the optical fiber 27 a-270 due to one star cycle other than the bright light. It is difficult to remove 1δ.

J3. In the above embodiment, the explosion inside the pressure vessel 1 is detected by detecting light, but in the present invention, the explosion in the pressure vessel 1 is detected by detecting light. C is also good because it detects focused light.

However, if J and C focused light is detected in the light as in the above embodiment, the explosion can be detected faster because the speed of light is faster, so J3 can be detected at an earlier stage of the explosion. Rupture disc9. '10 can be exploded.

In addition, in the embodiment, the light inside the pressure vessel 1 is transmitted to the photoelectric substation circuits 288 to 28G installed outside the pressure vessel 1.
Since C is guided using optical fibers 27a to 27c,
Inserting into the pressure vessel 1 a photoelectric transducer (which itself may become an ignition source), a sensor (which detects pressure, sound, etc.), etc., may create an inconvenience that may create a new cause of an explosion. There is no.

In addition, in the above-mentioned embodiment C, under normal conditions, the intermediate pressure chamber 1G is always
Since the air d50 is connected to the port, there is no problem of pressure drop due to leakage during normal operation.
A suitable pressure P2 can always be applied to the intermediate L1 force 16. 1. In the above embodiment, three systems of explosion detection means are provided, but the number of explosion detection means can be set to any number as required.

〔Effect of the invention〕

As described above, the rupture disc device for suppressing explosion damage according to the present invention is sealed! ,: If an explosion occurs within the device,
detecting the explosion at the initiation of the explosion;
There is an excellent effect in that the safety rupture disc can be reliably ruptured to more reliably prevent damage to the sealed device itself.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing one embodiment of the rupture disc device for suppressing explosion damage according to the present invention (however, the electrical parts are shown in block diagrams), and Fig. 2 is a cross-sectional view showing the embodiment of the rupture disc device for suppressing explosion damage according to the present invention. There is an enlarged cross-sectional view of the rupture disc installation area A. 1... Pressure vessel, 9... First safety rupture disc, 10.
...Second safety rupture disc, 13...Space inside the pressure horn container, 1 (3...Intermediate pressure chamber, 17...Solenoid valve, 27a
~27G...Optical fiber, 28a~28c...Photoelectric conversion circuit, 29a~29G...Comparison circuit, 3
08-30 G--Solenoid valve drive circuit. Patent applicant Nagamori Industrial Safety Research Institute, Ministry of Labor Government agent Patent attorney Public appearance 91

Claims (1)

[Claims] a first safety rupture disc having one side in contact with a space within the sealed device or a space communicating with the space;
a second safety rupture disc in contact with the space in which the focal pressure is to be released or a space communicating with the space; the other side of the first safety rupture disc and the other side of the second safety rupture disc; an intermediate pressure chamber formed between the intermediate pressure chamber and the intermediate pressure chamber to which a predetermined internal pressure is normally applied;
A nuclear power plant detection means for detecting an explosion entering the space inside the sealed device; When the detection means detects the flash, the valve driving means for causing the valve to communicate between the intermediate pressure chamber and the low pressure space is activated.
A rupture disc device for suppressing explosion damage.