JP2001349496A - Constant-pressure taking-out tool for liquefied gas - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a constant-pressure taking-out tool for liquefied gas capable of exercising the stable performance with a simple structure. SOLUTION: An outer peripheral face of a liquefied gas storage bottle 1 is coated by a flexible synthetic resin bag body 2 provided with a water passage 7 inside thereof. The hot water for supplying the vaporized latent heat to the inside of the flexible synthetic resin bag body 2, is passed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquefied gas constant-pressure extracting device capable of stably extracting a liquefied gas at a predetermined pressure.

[0002]

2. Description of the Related Art When a liquefied gas is taken out as a gas, the pressure of the gas taken out fluctuates unless the taken out flow rate and the vaporization rate match. In recent years, it has been increasingly required to supply gas at a pressure equal to or higher than a predetermined gas pressure, such as a fuel gas for a micro gas turbine.

[0003] When a large amount of gas is consumed in a relatively large storage container such as a bulk container, the gas is taken out of the gas storage container in a liquid state, and the pressure is increased by a liquid feed pump arranged in the middle of the piping system, and the vaporizer is pressurized. It is supplied at a constant pressure by vaporizing using a vaporization facility such as, or is taken out in a gas state from a gas storage container, and the taken out gas is supplied to a constant pressure by pressurizing with a compressor.

On the other hand, when taking out gas from a small gas storage container such as a gas cylinder in the gas state, hot water is showered into the liquefied gas storage container or the liquefied gas storage container is immersed in the water tank to reduce the heat of vaporization. Some are obtained from hot or cold water.

[0005]

In the case of taking out a liquid, the pressure of the taken out liquid is increased by a pump, and then vaporized by a vaporizer such as a vaporizer. If a pump is used, the equipment becomes a high-pressure gas producing facility. However, security distance and security personnel are required, and the cost is not economical. On the other hand, in the case of gas extraction, the extracted gas is pressurized by a compressor. However, since this compressor is very expensive, there is a problem that it is not economical.

On the other hand, when showering in a liquefied gas storage container or immersing in a water tank, water directly contacts the surface of the liquefied gas storage container, so that the liquefied gas storage container is corroded. There is a problem. And
In the case of using the shower ring, there is a problem that the contact efficiency of the jetted water with the liquefied gas storage container is low, and the amount of water used becomes large. Further, when the liquefied gas storage container is immersed in the water tank, there is a problem that it is necessary to take measures against buoyancy acting on the liquefied gas storage container.

The present invention has been made in view of the above points, and an object of the present invention is to provide a liquefied gas constant pressure withdrawing tool which can exhibit stable performance with a simple structure.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a bag made of a flexible synthetic resin in which a water passage is formed inside an outer peripheral surface of a liquefied gas storage container such as a liquefied gas cylinder or a bulk storage tank. It is characterized in that warm water for supplying latent heat of vaporization necessary for vaporization of liquefied gas is passed through the inside of a flexible synthetic resin bag body.

[0009]

According to the present invention, the peripheral surface of the liquefied gas storage container is covered with a bag made of a flexible synthetic resin, and hot water is passed through a water passage provided inside the bag. Therefore, the amount of heat held in the hot water can be used effectively, and the surface of the liquefied gas storage container does not corrode because water does not directly act on the liquefied gas storage container.

[0010]

FIG. 1 shows an embodiment of the present invention.
FIG. 1 is a schematic configuration diagram when liquefied petroleum gas is derived from a liquefied petroleum gas cylinder (liquefied gas storage container) at a pressure equal to or higher than a predetermined pressure. Reference numeral (1) in the figure denotes a liquefied petroleum gas cylinder, and the outer periphery of the trunk of the liquefied petroleum gas cylinder (1) is covered with a water jacket (2). Reference numeral (3) denotes a water supply port disposed below the water jacket (2), and (4) denotes a drain port disposed above the water jacket (2).

The water jacket (2) is formed of a bag made of a flexible synthetic resin. As shown in FIGS. 1 and 2, the inner surface of the water jacket (1) is in contact with the outer peripheral surface of the liquefied petroleum gas cylinder (1). The sheet (5) and the outer sheet (6) located on the outer side are heat-welded in a plurality of steps in the circumferential direction of the liquefied petroleum gas storage container (1) and the inside thereof is formed into a series of zigzag water passages (7). It is formed. A hook-and-loop fastener (8) that engages with each other is attached to the left and right side edges of the water jacket (2) in the vertical direction. In this embodiment, the water jacket is used.
(2) is formed of a bag made of vinyl chloride resin.

The passage height (vertical width) of the water passage (7) formed in the water jacket (2) is formed in three stages at a vertical position. The passage height in each section is set such that the upper water passage (7A) is the highest and the lower water passage (7C) is the lowest. Water jacket
When the total height of (2) is 855 mm, the waterway (7B) located at the middle part is a four-stage waterway at an 80 mm pitch and located at the top.
(7A) is a 105-pitch three-stage, lower waterway (7
C) is formed in four steps at a 55 mm pitch.

When the water jacket (2) is made of a flexible synthetic resin bag, hot water (for example, water having a water temperature of about 20 ° C.) for heating the liquefied gas is supplied to the water passage (7). When this is done, the water jacket (2) expands and comes into close contact with the body wall surface of the liquefied petroleum gas cylinder (1), so that the heat exchange efficiency increases. In the above embodiment, the water passage
(7) The upper and lower widths of the upper part, the middle part and the lower part are different because the lower part has a higher pressure due to the water head pressure if the same width is formed. This is to maintain the strength of the water jacket (2) by reducing the width of the water channel (7C). Further, as the liquefied gas evaporates, the liquid level in the liquefied gas storage container moves to the lower part. Therefore, when the width of the passage located at the lower part of the water jacket (2) is reduced, the flow rate of the hot water increases. , Heat exchange efficiency can be increased.

When the water jacket is wound around the outer periphery of the body of a liquefied petroleum gas cylinder and gas is taken out at a rate of 2.1 kg / Hr, hot water set at a water temperature of 20 ° C. is circulated and supply is stopped. FIG. 3 shows the change in the pressure of the gas taken out at the above step. In this case, the gas is extracted from a state in which 100% liquefied petroleum gas is stored in a so-called 50 kg container.

According to FIG. 3, while supplying hot water, gas of 6 kg / cm ² · G or more could be taken out stably, but when the supply of hot water was stopped, the gas was taken out according to the gas taking out. It can be seen that the pressure decreases. The gas pressure drop immediately after the start of gas discharge is due to the gas pressure drop associated with gas discharge and the time required for hot water to heat the liquid portion in the container. it is conceivable that.

FIG. 4 shows that a so-called 50 kg cylinder has 60%
This figure shows the change in the pressure of the withdrawn gas when the flow rate and temperature of the supplied hot water are changed when gas is withdrawn at a rate of 2.1 kg / Hr from the state where liquefied petroleum gas is stored.

According to FIG. 4, it can be seen that when the flow rate of the hot water decreases, the pressure of the extracted gas decreases. Also, when the flow rates are the same, it can be seen that when the water temperature is increased, the pressure of the extracted gas increases. In FIGS. 3 and 4, although the hot water temperature and the hot water flow rate are the same, there is a difference in the gas pressure recovery time immediately after the start of gas extraction, but this is because the liquid portion in the storage container is heated. This is considered to be because the time for performing the cleaning is faster when 60% remains.

FIG. 5 shows a modification of the water jacket (2).
The inner sheet (5) and the outer sheet (6) are heat-welded in a state where they are divided into three sections (in the height direction), and the inner sheet (5) and the outer sheet (6) are divided into a plurality of steps in each part. A series of zigzag water passages were formed by heat welding. When the inside of the water jacket (2) is divided into a plurality of sections in the vertical direction as described above, the influence of the water head pressure can be reduced and the flow of hot water can be performed smoothly. When the temperature is lowered, the supply of hot water to the upper gas-phase corresponding portion is stopped, so that useless heating can be suppressed.

In each of the above embodiments, the water jacket is formed by forming the bag body with the same material of synthetic resin, but the sheet located on the inner surface side is made of synthetic resin having both flexibility and good thermal conductivity. It is preferable that the sheet located outside is formed of a synthetic resin having low thermal conductivity. Further, the outside of the water jacket may be covered with a heat insulating material.

The hot water supplied into the water jacket (2) may be discharged after use or may be circulated.

In the above embodiment, the liquefied gas storage container has been described as an example of a liquefied gas cylinder, but it may be a bulk storage tank.

In the above embodiment, liquefied petroleum gas is described as an example of liquefied gas. However, when liquefied petroleum gas is taken out in a gas state and the gas pressure of the taken out gas is required to be a certain pressure or more, It can be applied to other liquefied gases.

[0023]

According to the present invention, the peripheral surface of the liquefied gas storage container is covered with a bag made of a flexible synthetic resin, and hot water is passed through a water passage provided inside the bag. Therefore, the amount of heat held in the hot water can be effectively used for vaporizing the liquefied gas inside the container, sufficient vaporization can be secured, and gas can be taken out at a predetermined pressure or higher for a long period of time. Further, in this case, since water does not directly act on the liquefied gas storage container, the surface of the liquefied gas storage container does not corrode.

Further, since the water jacket is formed of a flexible synthetic resin bag, when hot water is supplied into the water jacket, the water passage portion of the water jacket expands and deforms, and the liquefied gas storage Since it comes into close contact with the wall surface of the container, heat exchange between the hot water in the water passage and the wall surface of the liquefied petroleum gas storage container can be efficiently performed.

In the case where the width of the water passage formed inside the water jacket is varied stepwise in the vertical direction, and the upper stage is formed wider and the lower stage is formed narrower, the heat exchange of hot water is performed while maintaining the strength of the water jacket. In addition, the efficiency of heat transfer to the liquefied gas container can be increased because the synthetic resin bag constituting the water jacket can be made thinner.

When the inside of the water jacket is divided into a plurality of stages in the vertical direction, and a water passage is formed in each of the divided portions, in addition to the above-mentioned effect of reducing the influence of the water head pressure, the water jacket is formed with gas consumption. When the surface is lowered, hot water can be supplied only to the liquid passage corresponding to the liquid phase in the liquefied gas container, so that the amount of heat retained in the hot water can be suppressed from being wasted.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram when liquefied petroleum gas is derived from a liquefied petroleum gas cylinder at a pressure equal to or higher than a predetermined pressure.

FIG. 2 is a front view of a water jacket.

FIG. 3 is a diagram showing a change in an extraction gas pressure depending on whether hot water is supplied or not.

FIG. 4 is a diagram showing a change in the extraction gas pressure when the temperature and flow rate of the hot water are changed.

FIG. 5 is a front view showing another embodiment of the water jacket.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Liquefied gas storage container, 2 ... Flexible synthetic resin bag (water jacket), 5 ... Inner side sheet, 6 ... Outer side sheet, 7 ... Water passage.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Shinzo Ishida, Inventor 4-5-1 Katsube, Moriyama-shi, Shiga Prefecture Inside Shiga Technology Center, Iwatani Industrial Co., Ltd. (72) Inventor Nakadaira, 4-5-1 Katsube, Moriyama-shi, Shiga Prefecture No. 1 Iwatani Industrial Co., Ltd. Shiga Technology Center F term (reference) 3E072 AA01 DB10 GA30

Claims (6)

[Claims] An outer peripheral surface of a liquefied gas storage container (1) is covered with a flexible synthetic resin bag (2) having a water passage (7) formed therein. A liquefied gas constant-pressure take-out device that allows hot water for supplying latent heat of vaporization to flow through 2). 2. A liquefied gas constant-pressure extracting device according to claim 1, wherein the liquefied gas storage container (1) is a bulk storage tank. 3. The liquefied gas constant-pressure extracting device according to claim 1, wherein the liquefied gas storage container (1) is a gas cylinder. 4. The liquefied gas constant-pressure extraction tool according to claim 1, wherein at least the inner surface side of the flexible synthetic resin bag body (2) is formed of a thermally conductive material. 5. An inner side sheet of a flexible synthetic resin bag (2).
(5) and the outer side sheet (6) are thermally welded, and the water passages (7) are arranged in a zigzag shape arranged in a height direction, and the vertical width of the water passage (7) is adjusted by a flexible synthetic resin bag. 2. The water passage (7A) located at a higher position is formed in a plurality of stages in the height direction of (2), and the vertical width of the water passage (7C) located at a lower position is wider than the water passage (7C) positioned at a lower position.
The liquefied gas constant-pressure take-out tool according to any one of claims 1 to 4. 6. An inner sheet (5) of a flexible synthetic resin bag (2).
And the outer side sheet (6) were thermally welded to divide the inside of the flexible synthetic resin bag (2) into a plurality of sections in the vertical direction, and the water passages (7) were formed in a zigzag shape in each section. The liquefied gas constant pressure extraction tool according to any one of claims 1 to 4.