JP2000320796A - Bulk storage tank for liquefied gas provided with freezing-prevention function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent bedewing and freezing on the surface of a storage tank body caused by a consumption of a gasified gas for a long time by disposing the radiation body of a radiator so as to immerse it in a liquefied gas in the storage tank body and supplying a slightly warm water of a specific temperature to the radiator by a warm water circulation control means to inhibiting a temperature drop of the liquefied gas. SOLUTION: In this horizontally installed storage tank body 1 of a bulk storage tank for a liquefied gas, a valve set 10 provided with a male type coupler 11 for taking in a liquefied gas from the outside and a open/close valve 12 for taking out a gasified gas are disposed on the upper surface of the tank 1 close to one end plate 3, and an openable/closable cover 13 is provided so as to protect the valve set 10. In this case, a horizontally long radiator 15 is disposed so as to sink in liquefied gas (g) in the storage tank body 1. The radiator 15 has an inner pipe 16 provided with a feeding port 17 for feeding a slightly warm water and an outer pipe 18 externally and concentrically fitted with the inner tube 16, having a discharge port 19, and is constituted such that a slightly warm water of adjusted to 40 deg.C or less flows from a warm water circulation control means 25 including a heater thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquefied gas bulk storage tank for consumers who continuously consume a large amount of vaporized gas mainly in hotels, apartments, restaurants and the like.

[0002]

2. Description of the Related Art In a conventional bulk storage tank for liquefied gas such as propane, there is a method in which a liquefied gas in the storage tank is vaporized by obtaining heat energy from an outer surface of the storage tank, and a gas obtained by natural vaporization is taken out and consumed. General. However,
Thermal energy transmitted from the storage tank surface to the inside changes depending on the outside air temperature and the storage tank surface area. For example, in a storage tank having a capacity of 500 kg, when the outside air temperature is -5 ° C. and the amount of liquefied gas in the storage tank is 30%, it is 1 in a short consumption mode.
Gas generation of about 22 kg per hour is expected. However, in the case of a long-time consumption mode under that condition, if the latent heat of vaporization required to vaporize the liquefied gas becomes larger than the heat energy obtained from the outer surface of the storage tank as the consumption time elapses, As the temperature of the liquefied gas decreases, the pressure also decreases. At the same time, since the temperature of the outer surface of the storage tank body also drops, dew condensation or icing occurs on the outer surface of the storage tank, and the heat energy required for vaporization further decreases, making it impossible to obtain the required amount of vaporized gas. Therefore, when the vaporized gas is consumed for a long time, a method of forcibly promoting the vaporization by using a vapor riser has been adopted.

[0003]

The forced vaporization method using the above-mentioned vapor riser is suitable when a large amount of liquefied gas is used using, for example, a bulk storage tank having a capacity of 500 kg. However, in the natural vaporization method, even if it is capable of generating about 22 kg of vaporized gas per hour in a short-time consumption mode, when this is used for a long time, about 7 kg of vaporized gas per hour is used. Only gas volume is obtained. Therefore, the conventional bulk storage tank had to adopt the forced vaporization type. Therefore, the disadvantage of the reduction in the amount of vaporized gas generated in the natural vaporization method described above is easily eliminated at low cost, and even in the case of long-time consumption, it is equivalent to the amount of vaporized gas generated in the case of short-time consumption. It has been desired to realize a device capable of obtaining the amount of vaporized gas generated.

[0004] It is an object of the present invention to obtain a vaporized gas generation amount equal to the vaporized gas generation amount obtained in a short-time consumption mode even in a long-time consumption mode. It is an object of the present invention to provide a liquefied gas bulk storage tank capable of preventing dew condensation and icing on the surface of a storage tank main body due to consumption and capable of stably taking out vaporized gas.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a liquefaction system in which a storage tank which is installed horizontally or vertically is provided with valves such as an on-off valve for extracting vaporized gas from the storage tank. A gas bulk storage tank in which a radiator of a radiator is disposed so as to be immersed in a liquefied gas in the storage tank main body, and a hot water circulation control means is provided in the radiator at 40 ° C.
It is provided so as to prevent the temperature of the liquefied gas from dropping by supplying the slightly warm water kept at the following predetermined temperature, thereby preventing dew condensation or icing that occurs on the surface of the storage tank body due to long-term consumption of the vaporized gas. And

[0006]

The function and effect of the present invention are as follows.
Warm water maintained at a predetermined temperature of not more than ° C circulates through the radiator, and the radiator radiates heat so that the liquid temperature of the liquefied gas does not decrease. Then, even when the consumption of the vaporized gas is continued for a long time, a decrease in the liquid temperature due to the latent heat of vaporization of the liquefied gas is suppressed as much as possible. As a result, it is possible to prevent a decrease in the amount of vaporized gas generated due to a decrease in the liquid temperature of the liquefied gas, and it is possible to eliminate a phenomenon in which dew condensation or icing occurs on the surface of the storage tank body.

The liquefied gas bulk storage tank provided with the freezing prevention function can suppress the temperature decrease due to the latent heat of vaporization of the liquefied gas due to the long-term consumption of the vaporized gas, so that the vaporized gas can be stably taken out. There are advantages.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a bulk storage tank,
FIG. 2 is a vertical sectional front view of the radiator portion.

In FIG. 1, a tank body 1 of a bulk storage tank for liquefied gas, which is installed horizontally, is provided with substantially hemispherical end plates 3 and 4 attached to the opening edge of a cylindrical body plate 2 by welding, respectively. Is formed. Reference numeral 5 denotes a suspension plate provided on the upper portion of the storage tank main body 1, and 6 denotes legs for mounting the storage tank main body 1. Reference numeral 10 denotes valves disposed at the center of the upper surface of the storage tank main body 1 near the one end plate 3 and provided with a male coupler 11 for taking in liquefied gas from the outside, an open / close valve 12 for taking out vaporized gas, and the like. A cover 13 protects the valves 10.

Reference numeral 15 denotes a horizontally long radiator disposed below so as to be immersed in the liquefied gas g in the storage tank main body 1, and as shown in FIG. An outer tube 18 as a heat radiator provided with a discharge port 19 on the side is disposed concentrically with the middle pipe 16 provided with the port 17 to form a sealed shape. 20
Are provided integrally. In the radiator 15, an outer tube 18 is inserted into an insertion opening 7a formed in the mounting seat 7 provided on the end plate 4 of the storage tank main body 1, and the flange 20 is mounted on the mounting seat 7 with the bolt 9 via the packing 8. Have been.

Reference numeral 25 designates a hot water circulation control means comprising a general heater unit and a pump unit (not shown), which keeps the slightly hot water supplied to the radiator 15 at a predetermined temperature of 40 ° C. or less. Is configured. The discharge side 25a of the hot water circulation control means 25 and the supply port 17 of the radiator 15 and the suction side 25b thereof and the discharge port 19 of the radiator 15 are connected by a rubber hose 26 or the like.

The reason why the temperature of the slightly warm water to be supplied to the radiator 15 is set to 40 ° C. or lower is that the standard of the cylindrical storage tank of the Japan LP Gas Plant Association, JLP
This is in accordance with the provision in A 202, section 3.3.2 Design temperature, that "The design temperature of the storage tank shall be 40 ° C."

In the liquefied gas bulk storage tank having an anti-freezing function configured as described above, the radiator 15 constantly circulates hot water maintained at a predetermined temperature of 40 ° C. or less by the hot water circulation control means 25. Liquefied gas g from the outer tube 18
The heat is dissipated. Thus, even if the consumption of the vaporized gas in the storage tank main body 1 temporarily increases, the liquefied gas g is heated, so that the temperature decrease due to the latent heat of vaporization is suppressed as much as possible. Accordingly, a phenomenon that dew or icing is caused on the surface of the storage tank body due to a decrease in the temperature of the liquefied gas is prevented beforehand, and a stable supply of the vaporized gas becomes possible.

[Brief description of the drawings]

FIG. 1 is a front view of a bulk storage tank.

FIG. 2 is a vertical sectional front view of a radiator portion.

[Explanation of symbols]

1 → Storage tank body 10 → Valves 15 → Heat radiator 16 → Middle pipe 17 → Supply port 18 → Outer pipe
(Heat radiator) 19 → Outlet 25 → Hot water circulation control means

Claims (1)

[Claims] 1. A liquefied gas bulk storage tank provided with a valve such as an on-off valve for taking out a vaporized gas in a storage tank main body provided in a storage tank main body installed horizontally or vertically, wherein the liquefied gas in the storage tank main body is provided. The radiator of the radiator is disposed so as to be immersed in the radiator.
C is supplied so as to prevent the temperature of the liquefied gas from dropping by supplying the slightly warm water maintained at a predetermined temperature of C or less, thereby preventing dew condensation or icing that occurs on the surface of the storage tank body due to long-term consumption of the vaporized gas. Bulk storage tank for liquefied gas with a feature that prevents freezing.