JPH0861597A - Explosion-proof gasifier for liquefied gas - Google Patents

Abstract

PURPOSE: To prevent excessive temp. rise in a heater element by forming a gasifier, which heats a liquefied gas and gasifies for inspection of the gas components, from a pipe through which the liquefied gas flows and a thermistor type electric heater device to heat the pipe. CONSTITUTION: An explosion-proof gasifier 1 to gasify the liquefied gas for inspection of the composition is composed of pipes 2 installed inside meanderingly, heat conduction plates 4, heater elements 6, heat insulative material 8, thermostat 10, control part 12, etc. The pipes 2 are made of stainless steel and located between two heat conduction plates 4, and small pieces 9 of aluminum, etc., having a high thermal conductivity are stopped between the pipes 2 and in the space to the heat conduction plates 4. Each plate 4 made from an aluminum plate is provided on one surface with a plurality of heater elements 6. When the temp. of the gas flowing out upon gasification exceeds the specified max. value (for example, 20 deg.C) and when the temp. of the plate 4 has exceeded its allowable value, the power to the heater elements 6 is shut off by the control part 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquefied gas explosion-proof vaporizer for vaporizing a liquefied gas for component inspection and the like.

[0002]

2. Description of the Related Art Fuel gas such as liquefied gas is composed of a plurality of kinds of gas, and the heat quantity of the gas per volume also differs if the component ratio is different. In the case of transferring to the storage tank of No. 2, the gas volume sent to the storage tank is measured, and at the same time, the liquefied gas is continuously or at any time extracted and vaporized by the vaporizer to inspect the gas component, that is, the amount of heat.

On the other hand, since the gas being transported is flammable, equipment that handles liquefied gas is required to have complete explosion-proof specifications. Conventionally, liquefied gas vaporizers are also equipped with hot water or steam. Explosion-proof construction is adopted, such as heating a pipe through which liquefied gas passes, or embedding a heater such as a nichrome wire inside the pressure resistant container and passing the gas circulation pipe through the heater to vaporize the liquefied gas.

[0004]

However, in order to heat using hot water or steam, it is necessary to provide a hot water generator or a steam device at the landing point of the liquefied gas, which is troublesome. It was Also, in the case of a vaporizer using a heater such as a nichrome wire, no matter how it is handled, the gas must not be heated to a temperature exceeding the ignition point of the gas, and therefore multiple temperature detections are required. There is a problem in that the price of the device becomes expensive because it is strictly required to install a container and a temperature control device for controlling the device.

The present invention solves the above problems and provides an inexpensive, easy-to-handle and reliable temperature control, and in particular, an explosion-proof vaporizer in which the gas temperature does not exceed the limit value in any case. With the goal.

[0006]

According to the present invention, a liquefaction gas for inspecting a component contained in a liquefied gas is examined from a distribution pipe for circulating the liquefied gas and an explosion-proof type thermistor type electric heater for heating the distribution pipe. It constituted an explosion-proof vaporizer for liquefied gas that heats and vaporizes the gas.

[0007]

[Function] Since the thermistor type pressure-resistant explosion-proof self-control heat plate is used as a heater, it does not automatically generate heat when the heating temperature exceeds a predetermined temperature, and a temperature control device is not required, resulting in overheating of the heater temperature. Absent.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a liquefied gas explosion-proof vaporizer according to the present invention will be described with reference to the drawings.

FIG. 1 is a front view in which a part of the carburetor 1 is sectioned,
2 is a side sectional view of the vaporizer 1. The vaporizer 1
A pipe 2 provided in a meandering inside, a heat transfer plate 4,
It is composed of a heater 6, a heat insulating material 8, a thermostat 10, a controller 12, and the like.

The pipe 2 is made of stainless steel and is provided between two heat transfer plates 4. A small piece 9 of aluminum or the like having a high thermal conductivity is provided between the pipes 2 and between the heat transfer plates 4. It is packed. A liquefied gas such as LNG flows into the pipe 2 from the upper side, becomes a gas from the lower side, flows out, and is sent to an analyzer (not shown). The heat transfer plate 4 is made of an aluminum plate, and a total of 12 heaters 6 are mounted on the surface of the heat transfer plate 4 on each side.

The heater 6 is a pressure-resistant explosion-proof self-control heat plate (manufactured by Bartec Corp .: BARTEC-HEAT H).
SE), the heating temperature is self-controllable, and it has a pressure-resistant explosion-proof structure that complies with European standards, and has passed the explosion-proof regulations of Japan. FIG. 3 shows the characteristics of the heater 6. As shown in FIG. 3, in the case of the heater 6 having an output of 200 W, the output becomes almost 0 when the ambient temperature exceeds 180 degrees, and the heater 6 has a characteristic of not generating heat.

The heat insulating material 8 is made of glass wool or the like and has a high heat insulating effect, and covers the entire heater 6 from the outside. The thermostat 10 is a pressure-resistant explosion-proof thermostat attached to the heat transfer plate 4, and the switch is cut off when the maximum temperature (for example, 20 ° C.) at which the vaporized gas is discharged is exceeded. In addition, the minimum gas temperature (eg 10
℃) lower, the switch is turned on, gas is 10-2
It is automatically controlled to 0 ° C.

The control unit 12 supplies power to each heater 6 and is also connected to a thermostat 10 to connect the heat transfer plate 4 to the heater 6.
If the temperature exceeds the allowable temperature, the thermostat 1
By the action of 0, the power supply to the heater 6 can be cut off, and an alarm or the like can be issued so that it can be dealt with in case of emergency.

Therefore, according to the vaporizer 1, when a gas in a liquid state is being sent from the tanker to the storage tank on the ground, if a part of the liquefied gas is passed through the pipe 2, the heat of the heater 6 causes the vaporization. It is discharged as a gaseous gas. As a result, the fed gas is analyzed by the analyzer (not shown), and the gas component is determined.
Moreover, since the heater 6 is a self-control type, the temperature does not rise above the allowable temperature, the gas does not rise to the ignition temperature at all, and the heater itself has an explosion-proof structure, so that it can be used in a gas atmosphere. The gas does not ignite.

In the above embodiment, the carburetor in which the heaters 6 are installed at 12 places has been described. However, the number of heaters is not limited to this and may be one when handling a small amount of gas. For example, in a vaporizer configured with one heater 6, in the case of analyzing the components of the liquefied gas in the storage tank, the vaporized gas of a predetermined amount is vaporized instead of vaporizing the gas that is continuously circulated. It can be used when being sent to the analyzer. Even in this case, it is possible to provide a vaporizer which is inexpensive, satisfies the explosion-proof condition, and can be easily handled.

Further, in the above embodiment, an example in which the pipe 2 is meandered on a plane has been described, but two heat transfer plates 4 made of aluminum provided with a heater 6 are arranged in parallel, and the pipe 2 is connected to them.
Alternatively, the heat transfer plates 4 may be formed in a spiral shape so as to alternately pass therethrough, and the whole may be covered with the heat insulating material 8. By doing so, the curvature of the pipe 2 can be made gentle, and the interval between the pipes can be shortened to allow more dense piping.

[0017]

According to the liquefied gas explosion-proof vaporizer of the present invention, a self-controlled pressure-resistant explosion-proof heater is used as the heater, and the pipe through which the liquefied gas passes is heated by this.
No excessive temperature rise occurs, and the heater does not ignite. Therefore, it is possible to provide a safe explosion-proof carburetor for liquefied gas, which is easy to handle without using hot water or steam, does not require an expensive control structure as in the case of using a nichrome wire.

[Brief description of drawings]

FIG. 1 is a partial front sectional view showing an embodiment of a vaporizer according to the present invention.

FIG. 2 is a side sectional view showing an embodiment of a vaporizer according to the present invention.

FIG. 3 is a graph showing characteristics of a heater.

[Explanation of symbols]

 1 vaporizer 2 pipe 4 heat transfer plate 6 heater 8 heat insulating material 9 small piece of aluminum 10 thermostat 12 controller

Claims (1)

[Claims] 1. A vaporizer which heats and vaporizes the liquefied gas in order to inspect the components contained in the liquefied gas, wherein the vaporizer circulates the liquefied gas and a thermistor type electric heating for heating the pipe. Explosion-proof vaporizer for liquefied gas, which is characterized by consisting of