JPS6252318A - Abnormality detector for vaporizer - Google Patents

Abstract

PURPOSE:To enable an alarm to be sounded when an abnormal condition occurs by judging whether a sound length is proper or not in such a manner that a duration length of an intermittently generated sound is continuously caught when liquified gas and air are mixed intermittently and a change in lengths of the generated sound is converted into an electric signal. CONSTITUTION:At a vaporizer 11 where liquified gas and air are intermittently mixed, a duration length of an intermittently generated sound is continuously caught by a microphone 12 and a change in length of the generated sound is converted into a electric signal and detected and then it is judged by a sequence circuit 14 whether the length of the signal is proper or not and when an abnormal condition occurs in the vaporizer 11 and abnormal alarm 15 is issued. Thus, as an operating condition where time is set in accordance with equipment is automatically detected, it can be determined automatically whether the equipment is normally operated or not.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" This invention relates to an abnormality detection device for a vapor riser in an LPG facility.

"Prior Art" A block diagram of a vaporizer for LPG equipment is shown in FIG. 2.

That is, liquefied petroleum gas 2 sent from a storage tank 1 is vaporized in an evaporator tube 3 using the heat of hot water 4, and the vaporized gas is mixed with air 6 in a mixer 5 to adjust calories. Detect the pressure in the surge tank 7 with a pressure gauge 8,
Gas at that pressure signal.

Air valves 9 and 10 are opened and closed.

The concave line 11 is a vaporizer.

The gas valve 9 and the air valve 10 installed on the inlet side of the mixing ta5 of the vapor riser 11 are mechanically coupled so that the gas amount and the air amount are at a constant ratio. 5.Turn on intermittently so that the pressure on the outlet side is constant.
It is controlled to be OFF.

However, due to various causes (for example, malfunction of the signal system, etc.)
In this case, an abnormal situation may occur in which the valve operation time is short (for example, 2 to 3 seconds).
Appropriate gas amount and air ratio are disrupted.

air will be reduced.

If the air ratio decreases, the calories of the mixed combustion gas will increase,
The combustion in the annealing furnace that uses this gas becomes incomplete combustion, resulting in a lower combustion temperature. In addition, soot is generated and a defective pattern appears on the surface of the strip product.

On the other hand, the valve operation time becomes longer (e.g. 4 to 5 m1n).
) There are also malfunctions.

This is because the gas nozzle is clogged and the amount of gas is reduced.
Suction becomes poor. In other words, the ratio of gas and air changes, resulting in a gas-rich state, resulting in the same situation as in the case where the operating time is short, as described above.

In addition, the time chart of the valve operating state and the calorie of the mixed combustion gas in each of the above-mentioned embodiments is shown in Figure 3 a''-c.
It's like this.

a indicates normal time, -b indicates short time, and C indicates long time.

The raised part on the operating state line indicates the opening of the gas valve 9.

The base is where the gas valve 9 is closed.

Also, on the calorie line, the calorie during mixing is high at the beginning and end of mixing, normal in the middle, and becomes the standard calorie when averaged, so if the mixing time is short, the calorie is high and is in an abnormal state.

In the past, in response to such an abnormal situation, an operator would periodically check the calorie content of the vaporizer to discover the abnormality.

"Problems to be Solved by the Invention" As mentioned above, the conventional detection means have the inconvenience of being unable to detect equipment abnormalities unless two people constantly monitor the equipment.

``Means for Solving the Problems'' and ``Operations'' The present invention was made in view of the above circumstances, and its gist is that when the vaporizer is operating normally, the mixing It should be noted that although the noise of 90 to 100 dB is periodically generated on the aircraft side for a predetermined period of time, the period and the time of occurrence change when an abnormality occurs.

In a vaporizer that intermittently mixes liquefied gas and air, a microphone continuously captures the length of the sound that occurs intermittently during mixing.7 Changes in the length of the generated sound are converted into electrical signals and detected. death.

A sequence circuit determines whether the length is appropriate and an alarm is issued when an abnormality occurs in the vaporizer, and the abnormality is automatically detected.

"Example" 2 This will be explained in detail below based on the drawings.

FIGS. 1a and 1b are sequence diagrams for detecting a case where a valve operating time is short, showing one embodiment of the present invention.

In the same circuit diagram, the microphone 1 installed near the vapor riser 11 can detect the sound periodically generated from the vapor riser 11.
2 is converted into an electrical signal, and this signal is amplified by an amplifier 13 and a value is sent to a sequence circuit 14.

If the value exceeds the reference value, relay X3 enters and an abnormality alarm 15 is issued.

Alarm 1 occurs because relay X2 is not disturbed for more than 4 seconds during normal operation.
There is no 5.

As described above, it is possible to determine whether one piece of equipment is operating normally by automatically detecting the operating state when the time is set according to the equipment (in this example, between 3 seconds and 4 seconds). I can do it. Also, by having a spare vaporizer device available, you can use it in case the vaporizer in use becomes abnormal.

Automatic switching is also possible.

In Figure 2, 16 indicates a lamp, and 17 indicates a push button.

"Effects of the Invention" As described above, as a result of being able to automatically detect abnormalities according to the two aspects of the present invention, various effects listed below can be achieved.

i) The number of periodic inspections (1 time/■]) can be reduced.

ii) Conventionally, it was not possible to detect abnormalities only during inspections, but with this device it is possible to detect them at all times.

1ii) Combustion defects in the AP line annealing furnace are eliminated.

No more defects in stainless steel products.

[Brief explanation of drawings]

FIGS. 1a and 1b are seam charts showing one embodiment of the present invention. 1... Storage tank, 2... Liquefied petroleum gas, 3
... Evaporation tube, 4... Hot water, 5... Mixer, 6...
・Air, -7... Surge tank, 8... Pressure gauge, 9
...gas valve, 10...air valve, 11...vaporizer, 12...microphone, 13...amplifier,
14...Sequence circuit, 15...Abnormal alarm. 16...Lamp, 17...Push button. Buchi Za

Claims (1)

[Claims] In a vaporizer that intermittently mixes liquefied gas and air, a microphone continuously captures the length of the sound that occurs intermittently during mixing, and detects the change in the length of the sound by converting it into an electrical signal. A vapor riser abnormality detection device characterized in that a sequence circuit determines whether the length is appropriate and issues an alarm when an abnormality occurs in the vapor riser.