JPH0733078A - Intrusive heat quantity variable heat insulating panel - Google Patents

Abstract

PURPOSE:To provide an intrusive heat quantity variable heat insulating panel capable of adjusting the heat insulating performance of a heat insulating panel itself for covering the outside of a low temperature liquefied gas tank. CONSTITUTION:An intrusive heat quantity variable heat insulating panel is constituted of a panel 14 formed of a flat hollow panel 7 with built-in reinforcing material 6, and heat insulating material 15 rigidly fixed to one side face of the hollow panel 7; a piepline 21 connected to the hollow panel 7 and provided with a valve; and a branch pipe 22 branching off from between the hollow panel 7 and the valve 20 so as to be connected to a vacuum source 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable penetration heat quantity type panel capable of controlling the quantity of heat entering from the outside into a low temperature liquefied gas tank.

[0002]

2. Description of the Related Art Generally, in a low temperature liquefied gas carrier such as an LNG carrier, if the heat insulating material for insulating the low temperature liquefied gas tank and its thickness are determined, the amount of heat entering from the outside into the low temperature liquefied gas tank is determined. On the other hand, the gas vaporized in the low-temperature liquefied gas tank by the heat entering from the outside is used as a part of the fuel of the main engine, but depending on the ship speed, the gas vaporized by the heat entering from the outside can be used as an auxiliary fuel. There is not enough gas. Therefore, conventionally, the liquid low-temperature liquefied gas taken out from the low-temperature liquefied gas tank is guided to a vaporizer to be forcibly vaporized, but in this case, in the liquefied low-temperature liquefied gas, It is not suitable as a fuel for mixed-burning diesel engines because it also vaporizes heavy components.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to overcome the above-mentioned conventional problems, and an object thereof is to adjust the heat insulating performance of the heat insulating panel itself covering the outside of the low temperature liquefied gas tank. Another object of the present invention is to provide a heat-insulating panel with variable intrusion heat amount.

[0004]

In order to achieve the above object, a variable intrusion heat quantity type heat insulating panel of the present invention is a panel comprising a flat hollow panel containing a reinforcing material and a heat insulating material fixed to one side surface thereof. And a pipe with a valve connected to the hollow panel, and a branch pipe branched from between the hollow panel and the valve and connected to a vacuum source.

When the inside of the hollow panel becomes a high vacuum due to the operation of the vacuum source, the amount of heat entering from the outside decreases, and when the vacuum source is stopped and the valve is opened, the degree of vacuum inside the hollow panel decreases and the entering from the outside. The amount of heat increases. The hollow panel is preferably made of a low temperature resistant material such as aluminum alloy or stainless steel.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 is a spherical low temperature liquid gas tank, and the low temperature liquid gas tank 1 is supported on a hull structure 3 by a support structure 2 having a cylindrical shape. The low temperature liquid gas tank 1 includes a northern tropical part (a northern latitudinal part adjacent to the center of the tank) 1a and a polar cap part (bottom part) 1b of the South Pole.
Is covered by the intrusion heat amount variable type heat shield panel 4 which constitutes the present invention, and the other portion 1c is covered by a normal heat shield material 5.

As shown in FIG. 2, the heat-insulation panel 4 of variable intrusion heat amount type is composed of a plurality of panels 14.
Each of the panels 14 is formed of a flat hollow panel 7 containing the reinforcing material 6 and a heat insulating material 15 fixed to one side surface (outer surface) of the hollow panel 7, and is attached to, for example, the tank 1. It is fixed to the outside of the tank 1 by bolts 8. A tube 9 for passing a bolt 8 is attached to the hollow panel 7 so as to pass through the hollow panel 7.

In order to maintain the airtightness of the heat insulating panel 4, the gap between the adjacent hollow panels 7 is sealed by the connecting member 10. Further, the joint 11 between the adjacent hollow panels 7 and 7 is closed by a filler 12 such as an adhesive or a filler, and further, the joint 13 between the external heat insulating materials 15 and 15 is
It is closed by a filling material 16 such as a foam material.

The reinforcing member 6 has a honeycomb structure as shown in FIG. 3, and the partition wall 17 is provided with a communication hole 19 so that the adjacent chambers 18 communicate with each other. Any material can be used as the reinforcing material 6 as long as it can prevent deformation of the hollow panel 7 during vacuum, and for example, load bearing foam material or the like may be used. On the other hand, a pipe 21 having a valve 20 is connected to the hollow panel 7, and a branch pipe 22 branched from between the hollow panel 7 and the valve 20 is connected to a vacuum pump 23. Vacuum pump 23
Are controlled by the controller 24, and the controller 24 is electrically connected to the pressure gauge 25 attached to the pipe 21.

Next, the operation of the intrusion heat variable type heat shield panel will be described. When the degree of vacuum inside the hollow panel 7 is changed by the vacuum pump 23, the amount of heat entering the low temperature liquefied gas tank 1 from the outside changes as shown in FIG. Then, the low temperature liquefied gas R in the low temperature liquefied gas tank 1 is vaporized by an amount commensurate with the change in the amount of heat entering. In addition, the heat of invasion from the outside into the low temperature liquefied gas tank 1 vaporizes only the light components that are easily vaporized and is supplied to the mixed combustion diesel engine.

[0011]

As described above, according to the present invention, a panel comprising a flat hollow panel containing a reinforcing material and a heat insulating material fixed to one side surface thereof, a pipe with a valve connected to the hollow panel, Since it consists of a hollow panel and a branch pipe that branches from between the valve and is connected to a vacuum source, the amount of heat that enters the low temperature liquefied gas tank can be adjusted arbitrarily through a heat insulating panel that covers the outside of the low temperature liquefied gas tank. it can.
Moreover, the heat of invasion from the outside into the tank selectively vaporizes the light components, so that the generated gas does not contain the heavy components.

[Brief description of drawings]

FIG. 1 is a side view including a partial cross-section of a low temperature liquefied gas tank whose part is covered with a variable penetration heat amount type heat insulating panel according to the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a diagram showing the relationship between the degree of vacuum and the amount of heat entering.

[Explanation of symbols]

 5 Heat-insulating panel 6 Reinforcement material 7 Hollow panel 14 Panel 15 Heat-insulating material 20 Valve 21 Pipe 22 Branch pipe 23 Vacuum pump

Claims (1)

[Claims] 1. A panel comprising a flat hollow panel containing a reinforcing material and a heat insulating material fixed to one side surface thereof, a pipe with a valve connected to the hollow panel, and a space between the hollow panel and the valve. A heat-insulation panel of variable intrusion heat amount, which is composed of a branch pipe branched from and connected to a vacuum source.