JP3221742U - Thermal insulation cover for liquefied gas cylinders - Google Patents

Abstract

The present invention provides a heat retaining cover for a liquefied gas cylinder which can be heated with high thermal efficiency in an apparatus for vaporizing and purifying the liquefied gas. In a device for vaporizing and purifying liquefied gas stored in a liquefied gas cylinder, a heat retaining cover used when heating the liquefied gas cylinder by warm air includes a back cover 52 disposed on the back of the liquefied gas cylinder A side cover 53 disposed on the side of the liquefied gas cylinder, a front cover 51 disposed on the front of the liquefied gas cylinder, an outer periphery of the liquefied gas cylinder, and a side surface covering at least a part of a gap between the side cover and the front cover And a front cover 54 disposed on top of the cover and the front cover. The side cover and the front cover cover from the bottom of the liquefied gas cylinder to a height not less than 1/4 and not more than 1/2 of the height of the liquefied gas cylinder. [Selected figure] Figure 4

Description

  The present invention relates to a cylinder cover used for heating a liquefied gas cylinder in an apparatus for vaporizing and purifying liquefied gas.

When the vapor of liquefied gas is taken out from a liquefied gas cylinder filled with liquefied gas, it is known that the temperature of the liquefied gas cylinder becomes low due to the heat of vaporization, and the amount of vaporization of the liquefied gas decreases with the passage of time.
In order to take out a certain amount of steam, it is necessary to heat the liquefied gas cylinder. In this case, it is common to heat the entire area from the bottom to the top of the liquefied gas cylinder.

  For example, Patent Document 1 discloses a warm water jacket for a liquefied gas cylinder. The warm water jacket has a height substantially the same as the height of the liquefied gas cylinder, and covers the bottom to the top of the liquefied gas cylinder.

JP-A-8-338594

  However, it is the liquid state portion of the liquefied gas located at the lower part of the liquefied gas cylinder where the temperature is lowered by the heat of vaporization. Even though the temperature drop in the upper portion of the gaseous state is relatively small, the upper and lower portions are uniformly heated, which is energy inefficient.

  In view of the above-mentioned subject, the present invention aims at providing a heat retention cover for liquefied gas cylinders with high energy efficiency.

The thermal insulation cover for a liquefied gas cylinder according to the present invention is an apparatus for vaporizing and purifying liquefied gas stored in a liquefied gas cylinder, and is a thermal insulation cover used when the liquefied gas cylinder is heated by warm air,
A back cover disposed on the back of the liquefied gas cylinder;
A side cover disposed on the side of the liquefied gas cylinder;
A front cover disposed in front of the liquefied gas cylinder;
A surface cover disposed on top of the side cover and the front cover so as to cover at least a part of the gap between the outer periphery of the liquefied gas cylinder and the side cover and the front cover;
The side cover and the front cover cover from a bottom surface of the liquefied gas cylinder to a height of 1/4 or more and 1/2 or less of the height of the liquefied gas cylinder.

  The back cover, the side cover, the front cover, and the front cover may be engaged as independent parts, and may be engaged with each other by a locking member or the like, but the side cover and the front cover may be integrally formed. .

  A hot air inlet for blowing hot air into the liquefied gas cylinder cover may be disposed in the back cover, the side cover, or the front cover.

  The side cover and the front cover may be configured to cover the bottom surface of the liquefied gas cylinder to a height equal to or less than 1/2 of the initial liquid level of the liquefied gas.

When the liquefied gas cylinder is heated by warm air, the warm air is retained within the heat insulating cover for a certain period of time by arranging the heat insulating cover for the liquefied gas cylinder according to the present invention so as to surround the liquefied gas cylinder. At this time, if the heat insulating cover is equal to the height of the liquefied gas cylinder, it is necessary to fill the warm air to the same position as the height of the liquefied gas cylinder.
However, since the liquefied gas is in a gaseous state at the upper part of the liquefied gas cylinder and the heat of vaporization is not taken away, it is not necessary to heat it. Nevertheless, heating to the top of the liquefied cylinder is a factor that reduces the thermal efficiency.

  Therefore, in the present invention, the height of the side cover and the front cover is reduced to 1/2 of the height of the liquefied gas cylinder, and the surface cover is further provided on the side cover and the front cover to make warm air It is configured to fill up to half of the height. With such a configuration, the required amount of warm air can be reduced as compared with the conventional case, and only the lower part of the liquefied gas cylinder in which the liquefied gas exists in the liquid state can be heated, so that the thermal efficiency can be enhanced.

In the present invention, since the back cover and the side cover are configured independently, it is possible to attach the side cover after placing the liquefied gas cylinder in front of the back cover. In general, the back cover is often fixed to the floor or wall in order to prevent the gas cylinder from falling over. In addition, liquefied gas cylinders have various sizes according to the amount of filling and the type of gas. Therefore, the side cover and the front cover can be selected and attached according to the size and height of the liquefied gas cylinder.
Furthermore, the surface cover may be made according to the size of the side cover and the front cover, and the outer diameter of the liquefied gas cylinder. The surface cover plays a role of suppressing the release of warm air from the heat insulating cover by filling the gap between the side cover and the front cover and the outer periphery of the liquefied gas cylinder, so the area between the cover and the outer periphery It is desirable to have a shape that fills at least 1/2 or more of

  When the liquefied gas is taken out from the liquefied gas cylinder in a gaseous state, a load cell for measuring the weight of the liquefied gas cylinder is disposed at the bottom of the liquefied gas cylinder in order to grasp the amount taken out. In order to measure the weight accurately, it is necessary to load the liquefied gas cylinder directly on the load cell. Therefore, in the present invention, the cover is not attached to the bottom of the liquefied gas cylinder.

  The side cover and the front cover may be arranged so as to cover at least a part of the portion corresponding to the liquid state portion of the liquefied gas filled in the liquefied gas cylinder. Therefore, it is good also as composition covered to 1/2 or less of the liquid level height in the state of the initial state attached to the device which refines liquefied gas.

  According to the above configuration, in the apparatus for vaporizing and purifying the liquefied gas, it is possible to provide a heat insulating cover for a liquefied gas cylinder that can be heated with high thermal efficiency.

FIG. 1 is a view showing a configuration example of a liquefied gas purification device of a first embodiment. FIG. 2 is a front view of a heat insulation cover for a liquefied gas cylinder of Embodiment 1; FIG. 2 is a side view of the heat insulating cover for a liquefied gas cylinder of the first embodiment. FIG. 2 is a top view of a heat insulation cover for a liquefied gas cylinder of Embodiment 1; It is a graph which shows the temperature change of the liquefied gas cylinder of Example 1 and Comparative Example 1.

(Embodiment 1)
The liquefied gas purification apparatus 100 of Embodiment 1 will be described with reference to FIG. The liquefied gas purification apparatus 100 of the first embodiment is an apparatus for vaporizing and purifying the liquefied gas stored in the liquefied gas cylinder 11.
The type of liquefied gas is not particularly limited, and may be, for example, ammonia, trifluoroiodomethane or the like.
The liquefied gas cylinder 11 is heated by warm air in order to maintain a constant amount of liquefied gas in a gaseous state derived from the liquefied gas cylinder 11. The warm air is introduced from the valve 24 into the inside of the heat insulating cover 40 for the liquefied gas cylinder, and is blown to the liquefied gas cylinder 11.
The vapor of the liquefied gas that has been heated and vaporized by the warm air is sent to the purification unit 12 via the pressure gauge 21, the pressure regulator 22, and the flow rate regulator 23 in a gaseous state. The purification unit 12 is not particularly limited as long as it removes impurities contained in the vapor of the liquefied gas, and may be, for example, an adsorption tower filled with an adsorbent, or may be a getter. The vapor of the liquefied gas purified in the purification unit 12 is sent to the container 13. The vessel 13 is cooled by the cooling device 30, and the liquefied gas is liquefied inside the vessel 13.
As the liquefied gas vaporizes, the weight of the liquefied gas cylinder 11 decreases. The amount of decrease is measured by the load cell 31 disposed at the bottom of the liquefied gas cylinder 11.

The liquefied gas cylinder heat insulating cover 40 has a back cover 52, a side cover 53, a front cover 51, and a front cover 54.
FIG. 2 is a front view of the liquefied gas cylinder 11 to which the heat insulating cover 40 for liquefied gas cylinder is attached. The liquefied gas cylinder 11 is disposed in front of the back cover 52, and the side cover 53 and the front cover 51 are attached thereto. The side cover is not shown in FIG.
The back cover 52 may be flat and may have a structure with edges on both sides of the flat. The height of the back cover 52 may be equal to or larger than that of the side cover 53 and the front cover 51. The back cover 52 shown in FIG. 2 is substantially the same as the height of the liquefied gas cylinder 11.

FIG. 3 is a side view of the liquefied gas cylinder 11 attached with a heat insulating cover for the liquefied gas cylinder. The back cover 52 has a structure in which a flat plate is edged. The side cover 53 is disposed to be in close contact with the edge of the back cover 52. The edge portion of the back cover 52 may have a portion overlapping with the side cover 53.
The side covers 53 are respectively disposed on both sides of the liquefied gas cylinder 11. The heights of the front cover 51 and the side cover 53 are preferably equal, and the height is at least 1/4 and at most 1/2 of the height of the liquefied gas cylinder. For example, when the height of the liquefied gas cylinder 11 is 1300 mm, the height of the back cover 52 can be 1200 mm, and the height of the front cover 51 and the side cover 53 can be 400 mm.
The liquid level of the liquefied gas initially filled in the liquefied gas cylinder 11 can be, for example, about 600 mm, but the height of 300 mm or more, which is 1/2 of the liquid level, is the front cover 51 and the side It is preferable that the cover 53 has.
The side cover 53 and the front cover 51 may be disposed in close contact with each other, or may be integrally formed in a U-shape.

FIG. 4 is a top view of the heat insulating cover 40 for a liquefied gas cylinder.
A front cover 54 is placed on the side cover 53 and the front cover 51. The surface cover 54 suppresses the phenomenon that warm air diffuses to the outside of the liquefied gas cylinder heat insulating cover 40. Therefore, the gap between the liquefied gas cylinder 11 and the portion surrounded by the back cover 52, the side cover 53, and the front cover 51 is formed so as to cover the gap. FIG. 4 shows a flat plate-like surface cover 54 in which the portion into which the liquefied gas cylinder 11 is inserted is cut into a semicircular shape.

  Although warm air is introduced into the heat insulation cover for liquefied gas cylinders, the inlet for warm air may be provided in the back cover 52 or may be provided in the side cover 53 or the front cover 51. The warm air is introduced at a temperature and a flow rate such that the surface of the liquefied gas cylinder 11 becomes 40 ° C. or less, and a predetermined amount of liquefied gas vapor can be derived.

Example 1
In the liquefied gas purification apparatus 100 shown in FIG. 1, the liquefied gas cylinder was heated using the heat insulation cover for a liquefied gas cylinder according to the present invention.
A liquefied gas cylinder 11 having a height of 1300 mm was filled with trifluoroiodomethane, which is a liquefied gas, until the liquid level reached 600 mm, and the liquid gas purification apparatus 100 was attached. The heat insulation cover 40 for liquefied gas cylinders is comprised from the back cover 52 with a height of 1200 mm, the side cover 53 with a height of 400 mm, and the front cover 51 with a height of 400 mm. Each cover is made of stainless steel, and the side cover 53 and the front cover 51 are integrally formed. After the liquefied gas cylinder 11 was placed on the load cell 31 on the front surface of the back cover 52, the side cover 53 and the front cover 51 were integrated.
In the back cover 52, a blowing hole for blowing warm air into the inside of the liquefied gas cylinder cover 40 is formed at a height of 300 mm from the bottom.
A pressure gauge 21 and a pressure regulator 22 are disposed at the container valve of the liquefied gas cylinder 11, and the amount of hot air blown is such that the pressure at the rear stage of the pressure regulator 22 is in the range of 0.2 to 0.3 MPa. Is adjusted. The warm air is air adjusted to a temperature of 60 to 80 ° C., and the flow rate is controlled by the valve 24.

The liquefied gas in the liquefied gas cylinder 11 is vaporized at a desired pressure immediately after the start of the vaporization, without heating of the warm air. However, as the vaporization time elapses, the temperature of the liquid portion of the liquefied gas in the liquefied gas cylinder 11 decreases. Then, warm air is blown to start heating the inside of the heat insulating cover 40 for the liquefied gas cylinder. Here, according to the heat insulation cover 40 for a liquefied gas cylinder according to the present invention, it is possible to heat only the lower part of the liquefied gas cylinder 11 having the liquid portion whose temperature has dropped, so the upper part of the liquefied gas cylinder 11 is overheated. It is possible to continue the vaporization of the liquefied gas without
The result of measuring the temperature of the outer surface of the liquefied gas cylinder 11 at the central portion (a position of 600 mm in height) of the liquefied gas cylinder 11 is shown by a thick line in FIG. The outer surface temperature of the liquefied gas cylinder 11 can be maintained at 40 ° C. or lower by using the heat insulating cover 40 for a liquefied gas cylinder according to the present invention.

(Comparative example 1)
In the liquefied gas purification apparatus 100 shown in FIG. 1, a heat retaining cover for a liquefied gas cylinder having a front cover and side covers having the same height as the back cover was prepared, and the liquefied gas was vaporized under the same conditions as in Example 1. The heights of the back cover, the front cover and the side cover at this time are all 1200 mm.
In this case, the warm air blown into the heat insulating cover for the liquefied gas cylinder heats up to the upper side of the liquefied gas cylinder (a portion where the liquefied gas is not in a liquid state but exists in a gaseous state). However, since the temperature is lowered by the heat of vaporization only at the lower side of the liquefied gas cylinder, the upper side of the cylinder is overheated. For this reason, when warm air is blown so as to derive the liquefied gas vapor at a desired pressure, the temperature of the outer surface of the cylinder is heated to 40 ° C. or higher as shown by a thin line in FIG. Become.

100. Liquefied gas purification device 11. Liquefied gas cylinder 40. Thermal insulation cover for liquefied gas cylinder 51. Front cover 52. Back cover 53. Side cover 54. Surface cover

Claims (4)

An apparatus for vaporizing liquefied gas stored in a liquefied gas cylinder for purification, which is a heat insulating cover used when the liquefied gas cylinder is heated by warm air,
A back cover disposed on the back of the liquefied gas cylinder;
A side cover disposed on the side of the liquefied gas cylinder;
A front cover disposed in front of the liquefied gas cylinder;
A surface cover disposed on top of the side cover and the front cover so as to cover at least a part of the gap between the outer periphery of the liquefied gas cylinder and the side cover and the front cover;
Have
The side cover and the front cover cover from a bottom surface of the liquefied gas cylinder to a height of 1/4 or more and 1/2 or less of the height of the liquefied gas cylinder.
Thermal insulation cover for liquefied gas cylinders.   The heat insulating cover for a liquefied gas cylinder according to claim 1, wherein the side cover and the front cover are integrally formed.   The hot air inlet for blowing warm air into the inside of the liquefied gas cylinder cover is disposed in the back cover, the side cover, or the front cover, according to claim 1 or 2, Cover for liquefied gas cylinders. The side cover and the front cover cover from the bottom surface of the liquefied gas cylinder to at least a half height or less of the liquid level of the liquefied gas. The heat insulation cover for liquefied gas cylinders as described in 1 or 2.

Images