JP2003028396A - Vaporizer for liquefied gas - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vaporizer for liquefied gas preventing dew formation and freezing without enlarging a vaporization pressure regulating valve or complicating a structure, and having no problems such as accelerating deterioration of components such as a diaphragm by heating. SOLUTION: In the device 10, piping 11 extended from a liquefied gas supply source is connected to a vaporization pressure regulating valve 12, the liquefied gas is vaporized by guiding it to a heat exchanger 13 via the vaporization pressure regulating valve 12. An orifice 16 is provided in a passage of the liquefied gas, communication pipes 15a and 15b are extended from the upstream and the downstream of the orifice 16 and they are connected to a diaphragm chamber 12c of the vaporization pressure regulating valve 12, and a gas reservoir 14 is formed in a subsequent stage of the heat exchanger 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquefied gas vaporizer which prevents condensation and freezing around a vaporization pressure control valve and ensures a smooth operation.

[0002]

2. Description of the Related Art As a liquefied gas vaporizer, a pipe 31 extending from a liquefied gas supply source is connected to a vaporized gas pressure adjusting valve 32 as shown in FIG.
The liquefied gas that has passed through the vaporized gas pressure adjusting valve 32 is guided to the heat exchanger 33, vaporized, and stored in the gas reservoir 34.

The vaporized gas pressure adjusting valve 32 is a safety valve 3
2a, a switching valve 32b, a diaphragm chamber 32c, and a switching lever 32d. A communication pipe 35 extending from the gas reservoir 34 is connected to the diaphragm chamber 32c to adjust the vaporized gas pressure corresponding to the internal pressure of the gas reservoir 34. Valve 32
Is working.

A safety valve 34a, a pressure gauge 34b, and a temperature sensor 34d are attached to the gas reservoir 34, and a liquid outflow prevention valve 34 operated by the output of the temperature sensor 34d.
The c is attached to the outlet of the gas reservoir 34 so as to prevent outflow of unvaporized gas.

[0005]

In the conventional liquefied gas vaporizers configured as described above, the vaporization pressure is 0.1M.
If the pressure is Pa, the temperature of the liquefied gas becomes -25 ° C, the vaporization pressure adjusting valve becomes -25 ° C, and the diaphragm is exposed to extremely low temperature. Therefore, the diaphragm is required to have the characteristic that it normally operates even at this extremely low temperature. It

On the other hand, when the vaporizing pressure control valve becomes extremely cold in this way, water in the surrounding atmosphere may condense and freeze up, thereby blocking the vent hole of the spring chamber holding the diaphragm. Therefore, the pressure regulation function becomes unstable.

In order to avoid this problem, there are some types in which the heat conduction area is reduced or the distance to the operating portion is increased, but this increases the size of the apparatus. In addition, there are those that circulate hot water in the operating part, but this complicates the structure, and when gas is not consumed, the temperature balance is lost and the temperature becomes high, and parts made of rubber or plastic such as diaphragms There is a problem that accelerates the deterioration of the.

In view of the above problems, the present invention is a liquefied gas vaporizer which does not increase the size of the vaporized gas pressure control valve or complicate the structure, and promotes the deterioration of parts such as diaphragms due to forced heating. Is to provide.

[0009]

In order to solve the above-mentioned problems, the present invention connects a pipe extending from a liquefied gas supply source to a vaporization pressure adjusting valve and guides the liquefied gas passing through the vaporization pressure adjusting valve to a heat exchanger. In the device for vaporizing liquefied gas, an orifice is provided in the flow path of the vaporized gas, a communication pipe is extended from the upstream side and the downstream side of the orifice and connected to the diaphragm chamber of the vaporized gas pressure adjusting valve, A gas reservoir is formed in the latter stage of the heat exchanger.

According to the present invention configured as described above, a minute pressure difference occurs between the upstream side and the downstream side of the orifice provided in the vaporized gas passage. Therefore, the gas heated and vaporized by the heat exchanger flows toward the diaphragm chamber through the communication pipe extending from the upstream side of the orifice, and flows toward the gas reservoir through the communication pipe extending from the downstream side and circulates. This will prevent condensation and freezing. Moreover, since the heating is performed only during operation (during gas consumption), the diaphragm and the like are not deteriorated.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a first embodiment will be described with reference to FIG. A pipe 11 extending from two liquefied gas supply sources (not shown) includes a safety valve 12a and a switching lever 12
The liquefied gas which is connected to the vaporized gas pressure adjusting valve 12 having a switching valve 12b which is operated by d, and which has passed through the vaporizing pressure adjusting valve 12 is guided to a heat exchanger 13 where it is heated by hot water and vaporized. It is converted and stored in the gas reservoir 14.

An orifice 16 is provided at the outlet of the gas reservoir 14, and communication pipes 15a, 15 are provided from the upstream side and the downstream side of the orifice 16.
b extends to the diaphragm chamber 12 of the vaporized gas pressure control valve 12.
connected to c.

The gas reservoir 14 has a safety valve 14a and a pressure gauge 1
4b and a temperature sensor 14d are attached, and a liquid outflow prevention valve 14c (thermo valve) which is operated by the output of the temperature sensor 14d is attached to the outlet of the gas reservoir 14.

In this embodiment configured as described above,
A pressure difference is generated before and after the orifice 16 provided at the outlet of the gas reservoir 14, and the gas heated and vaporized by the heat exchanger 13 is used as the communication pipe 15a, the diaphragm chamber 12c, and the communication pipe 15
b. Since the gas is circulated in the order of the gas reservoir 14, no condensation or freezing occurs in the vaporized gas pressure adjusting valve 12 and abnormal heating is not performed, so that there is no fear of deterioration of rubber or plastic parts such as a diaphragm.

Next, a second embodiment will be described with reference to FIG. A pipe 21 extending from two liquefied gas supply sources (not shown) is connected to a liquefied gas supply passage 28 via a switching valve 27 and is operated by an output of a temperature sensor 28c attached to a hot water passage of the heat exchanger 23. Supply control valve 28a
After passing through the (thermo valve) and the abnormal pressure control valve 28b, the vaporized gas pressure adjusting valve 22 adjusts the vaporized pressure to the heat exchanger 2
3 is heated by warm water, vaporized, and stored in the gas reservoir 24. 28d is a temperature sensor lead pipe,
24b is a drain removing plug.

The gas consumption conduit 29 deeply inserted into the gas reservoir 24 is provided with an orifice 26, and communicating pipes 25a and 25b extend from the upstream side and the downstream side thereof and are connected to the diaphragm chamber 22c of the vaporized gas pressure adjusting valve 22. Has been done.

In this embodiment, which is configured as described above,
A pressure difference is generated before and after the orifice 26 provided in the gas consumption conduit 29, and the gas heated and vaporized by the heat exchanger 23 is
Communication pipe 25a, diaphragm chamber 22c, communication pipe 25b,
The vaporized gas pressure adjusting valve 22 is circulated in the order of the gas consumption line 29, and neither condensation nor freezing occurs in the vaporized gas pressure adjusting valve 22 and abnormal heating is not performed, so that there is no fear of deterioration of rubber or plastic parts such as a diaphragm.

[0018]

As described above, according to the present invention, the gas heated and vaporized in the heat exchanger is utilized by utilizing the minute pressure difference generated between the upstream side and the downstream side of the orifice provided in the flow path of the vaporized gas. Then, the communication pipe extending from the upstream side of the orifice, the diaphragm chamber, and the communication pipe extending from the downstream side are circulated in that order to prevent dew condensation and freezing. Moreover, since heating is performed only during operation (when gas is consumed), abnormal heating is not caused and deterioration of rubber and plastic parts such as diaphragms is not caused.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment.

FIG. 2 is a configuration diagram of a second embodiment.

FIG. 3 is a block diagram of a conventional liquefied gas vaporizer.

[Explanation of symbols]

10, 20, 30 Liquefied gas vaporizer 11,21,31 Piping 12, 22, 32 Vaporized gas pressure control valve 12a, 32a Security valve 12b, 32b switching valve 12c, 32c diaphragm chamber 12d, 32d switching lever 13,23,33 heat exchanger 14,24,34 gas reservoir 15a, 25a communication pipe (upstream side) 15b, 25b communication pipe (downstream side) 16,26 Orifice 27 switching valve 28 Liquefied gas supply path 28a Oversupply control valve 28b Abnormal pressure control valve 28c temperature sensor 28d lead pipe 29 gas consumption pipeline 35 communication pipe

Claims (6)

[Claims] 1. An apparatus for connecting a pipe extending from a liquefied gas supply source to a vaporization pressure adjusting valve, and guiding the liquefied gas passing through the vaporized gas pressure adjusting valve to a heat exchanger to vaporize the liquefied gas,
An apparatus for vaporizing liquefied gas, characterized in that an orifice is provided in the vaporized gas flow path, and communication pipes are extended from the upstream side and the downstream side of the orifice and are connected to the diaphragm chamber of the vaporized gas pressure adjusting valve. 2. The liquefied gas vaporizer according to claim 1, wherein a gas reservoir is formed in the latter stage of the heat exchanger. 3. The liquefied gas vaporizer according to claim 1, wherein the vaporized gas pressure adjusting valve is provided with a switching valve and a safety valve. 4. A safety valve and a temperature sensor are attached to the gas reservoir, and a liquid outflow prevention valve that operates by the output of the temperature sensor is installed at the outlet of the gas reservoir. A vaporizer for liquefied gas according to claim 1. 5. An automatic switching valve, a liquid outflow prevention valve and an abnormal pressure prevention valve are arranged between a pipe extending from the liquefied gas supply source and the vaporized gas pressure adjusting valve. The liquefied gas vaporizer according to. 6. The liquefied gas according to claim 1, wherein the liquid outflow prevention valve is operated by an output of a temperature sensor attached to a hot water passage. Vaporizer.