KR-20260062151-A - Insulating system and Insulating method for liquified gas storage

Abstract

An insulating system for a liquefied gas storage tank according to one embodiment of the present invention comprises an insulating fluid flow pipe section coupled to the outer periphery of a liquefied gas storage tank, an injection gas cooling section for providing a cooled injection gas to the insulating fluid flow pipe section, and an insulating fluid flow pipe section coupled to the outer periphery of the liquefied gas storage tank, wherein the injection gas cooling section cools the injection gas flowed from the insulating fluid flow pipe section and provides the cooled injection gas to the insulating fluid flow pipe section.

Inventors

• 이준채
• 최원재
• 이승철

Assignees

• 한화오션 주식회사

Dates

Publication Date

20260507

Application Date

20241025

Claims (8)

1. An insulated fluid flow pipe section coupled to the outer periphery of a liquefied gas storage tank; An injection gas cooling unit for providing cooled injection gas to the above-mentioned adiabatic fluid flow pipe; and It includes an insulating fluid flow pipe section coupled to the outer periphery of the above-mentioned liquefied gas storage tank, and The injection gas cooling unit cools the injection gas flowing from the adiabatic fluid flow pipe and provides the cooled injection gas to the adiabatic fluid flow pipe. Liquefied gas storage tank insulation system.
2. In Article 1, An internal space is formed between the above-mentioned liquefied gas storage tank and the hull (H), and the above-mentioned insulating fluid flow pipe is located in the internal space. Liquefied gas storage tank insulation system.
3. In Article 1, The above-mentioned flow pipe section includes an inlet pipe and an outlet pipe, and One side of the inlet pipe is connected to the injection gas cooling section, and the other side of the inlet pipe is connected to the adiabatic fluid flow section. One side of the above outlet pipe is connected to the injection gas cooling section, and the other side of the above outlet pipe is connected to the adiabatic fluid flow pipe section. Liquefied gas storage tank insulation system.
4. In Paragraph 3, In the above-mentioned adiabatic fluid flow pipe section, an injection gas inlet and an injection gas outlet are formed, the inlet pipe is connected to the injection gas inlet, and the outlet pipe is connected to the injection gas outlet. Liquefied gas storage tank insulation system.
5. In Article 1, The apparatus further includes a temperature sensor for detecting the internal temperature of the liquefied gas storage tank, and further includes a control unit for controlling the temperature of the injected gas through the internal temperature of the liquefied gas storage tank detected by the temperature sensor. Liquefied gas storage tank insulation system.
6. In Article 2, The above internal space is formed between the tank body and the insulation part of the liquefied gas storage tank. Liquefied gas storage tank insulation system.
7. Cooled injection gas is injected into an insulated fluid flow pipe connected to the outer periphery of a liquefied gas storage tank, and The above-mentioned injection gas flowing through the insulating fluid flow pipe is flowed to the injection gas cooling section, and The above injection gas cooling unit cools the injection gas and injects it back into the adiabatic fluid flow pipe. Insulation method for liquefied gas storage tanks.
8. In Article 7, Check the internal temperature of the above liquefied gas storage tank, and through the above internal temperature The above injection gas cooling unit cools the injection gas. Insulation method for liquefied gas storage tanks.

Description

Insulating system and insulating method for liquified gas storage The present invention relates to an insulation system and method for a liquefied gas storage tank, and more specifically, to an insulation system and method for a liquefied gas storage tank that blocks heat inflow from the outside of the liquefied gas storage tank by flowing cooled injection gas through an insulating fluid flow pipe connected to the outer periphery of the liquefied gas storage tank. Natural gas is composed mainly of methane and is attracting attention as an eco-friendly fuel because it emits almost no environmental pollutants when burned. Liquefied Natural Gas (LNG) is obtained by liquefying natural gas by cooling it to approximately -163°C under atmospheric pressure; since its volume is reduced to about 1/600 of its gaseous state, it is highly suitable for long-distance transportation by sea. Therefore, natural gas is mainly stored and transported in the form of liquefied natural gas, which is easy to store and transport. Furthermore, since the liquefaction point of natural gas is an extremely low temperature of approximately -163°C at atmospheric pressure, LNG storage tanks are generally insulated to maintain the LNG in a liquid state. However, although LNG storage tanks are insulated, there are limitations to blocking external heat, and as external heat is continuously transferred to the tank, the LNG continuously evaporates naturally within the tank during transportation, generating Boil-Off Gas (BOG). Meanwhile, a liquefied gas storage tank according to the prior art re-liquefies the evaporated gas using a re-liquefaction device and recovers it to the storage tank. As described above, liquefied gas storage tanks according to the prior art have the problem that it is difficult to block external heat, so the amount of evaporated gas generated cannot be reduced, and the system becomes complex and costs increase due to the evaporated gas re-liquefaction device. Meanwhile, in the case of independent tanks or membrane tanks according to conventional technology, a minute amount of injection gas at room temperature is supplied to the internal space, but this is for gas detection and preservation and has limitations in reducing the generation of evaporated gas. FIG. 1 is a schematic diagram illustrating a storage tank insulation system of a ship according to a first embodiment of the present invention. FIG. 2 is a schematic diagram illustrating a storage tank insulation system of a ship according to a second embodiment of the present invention. FIG. 3 is a schematic diagram illustrating a portion of the technical configuration of a storage tank insulation system of a ship according to a third embodiment of the present invention. In order to fully understand the operational advantages of the present invention and the objectives achieved by the implementation of the present invention, reference must be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described therein. The structure and operation of a preferred embodiment of the present invention will be described in detail below with reference to the attached drawings. It should be noted that in assigning reference numerals to the components of each drawing, identical components are denoted by the same numeral whenever possible, even if they are shown in different drawings. In the embodiments of the present invention described below, the vessel may be any type of vessel equipped with a storage tank for storing liquefied gas. Representative examples include vessels with self-propulsion capabilities such as LNG carriers, liquid hydrogen carriers, and LNG RVs (Regasification Vessels), as well as offshore structures that do not have propulsion capabilities but float on the sea, such as LNG FPSOs (Floating Production Storage Offloading) and LNG FSRUs (Floating Storage Regasification Units). In addition, this embodiment can be applied to all types of liquefied gases that can be transported by liquefying the gas at a low temperature and generate evaporative gas in the stored state. Such liquefied gases may be, for example, liquefied petrochemical gases such as LNG (Liquefied Natural Gas), LEG (Liquefied Ethane Gas), LPG (Liquefied Petroleum Gas), liquefied ethylene gas, and liquefied propylene gas. The liquefied gas storage tanks of the embodiments may be fuel tanks in which liquefied gas is stored to be used as fuel in ships that use liquefied gas as fuel, and the embodiments may be applied to insulate the fuel tanks. FIG. 1 is a schematic diagram illustrating a storage tank insulation system of a ship according to a first embodiment of the present invention. As described above, the storage tank insulation system (1000) of a ship includes a liquefied gas storage tank (1100), an injection gas cooling section (1200), a flow pipe section (1300, 1400), and an insulating fluid flow pipe section (1500). More specifically, the insul