KR-20260062152-A - Insulating system and Insulating method for liquified gas storage

KR20260062152AKR 20260062152 AKR20260062152 AKR 20260062152AKR-20260062152-A

Abstract

A liquefied gas storage tank insulation system according to one embodiment of the present invention comprises an internal space formed between a liquefied gas storage tank and a hull, a cooling unit for providing cooled injection gas to the internal space, a gas leak detector for detecting leaked gas leaking from the liquefied gas storage tank, a flow pipe unit connected between the internal space and the cooling unit, and a discharge unit for discharging injection gas containing leaked gas from the liquefied gas storage tank, wherein the cooling unit provides cooled injection gas to the internal space, and when leaked gas is detected through the gas leak detector, the leaked gas is discharged through the discharge unit.

Inventors

이준채
최원재
이승철

Assignees

한화오션 주식회사

Dates

Publication Date: 20260507
Application Date: 20241025

Claims (13)

An internal space formed between the liquefied gas storage tank and the hull; A cooling unit for providing cooled injection gas to the internal space above; A gas leak detector for detecting leaked gas leaking from the above-mentioned liquefied gas storage tank; A flow pipe section connected between the internal space section and the cooling section; and It includes a discharge section for discharging injection gas containing leaked gas from the above-mentioned liquefied gas storage tank, and The above cooling unit provides cooled injection gas to the internal space, and if a leaked gas is detected through the gas leak detector, the leaked gas is discharged through the discharge unit. Liquefied gas storage tank insulation system.
In Article 1, The above cooling unit is composed of an injection gas cooling unit or an injection gas heat exchange unit. Liquefied gas storage tank insulation system.
In Article 2, The above injection gas cooling unit cools the injection gas flowing from the internal space, and 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 internal space. One side of the above outlet pipe is connected to the injection gas cooling section, and the other side of the above inlet pipe is connected to the injection gas of the internal space. Liquefied gas storage tank insulation system.
In Article 2, The injection gas heat exchanger cools the injection gas flowing from the internal space through heat exchange, and The above-mentioned flow section includes an inlet pipe, an outlet pipe, and a heat exchanger, and The above heat exchange tube is disposed inside the injection gas heat exchanger, and the refrigerant and the injection gas of the heat exchanger exchange heat. One side of the above inlet pipe is connected to the heat exchanger, and the other side of the above inlet pipe is connected to the internal space, and One side of the above outlet pipe is connected to the heat exchange pipe, and the other side of the above inlet pipe is connected to the injection gas of the internal space. Liquefied gas storage tank insulation system.
In Article 4, Providing a flow force toward an injection gas heat exchanger for the injection gas flowing from the above outlet pipe, and further comprising a blower mounted on the outlet pipe. Liquefied gas storage tank insulation system.
In Article 3 or Article 4, In the above internal space, 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.
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.
In Article 1, The above internal space is formed between the tank body and the insulation part of the storage tank. Liquefied gas storage tank insulation system.
Cooled injection gas is injected into the internal space of the liquefied gas storage tank, and The above injection gas flows through the internal space, and The injection gas that has flowed through the internal space is flowed to an injection gas cooling section or an injection gas heat exchange section, and The above injection gas is cooled in the cooling section or injection gas heat exchange section, and the cooled injection gas is injected into the internal space. In the event of a gas leak from the above liquefied gas storage tank, the injected gas and the leaked gas are discharged to the outside through the discharge port. Insulation method for liquefied gas storage tanks.
In Article 9, In the event of a gas leak from the above liquefied gas storage tank, the outflow valve flowing to the injection gas cooling unit or injection gas heat exchange unit is closed, and the discharge valve connected to the discharge unit is opened. Insulation method for liquefied gas storage tanks.
In Article 9, In the event of a gas leak from the above-mentioned liquefied gas storage tank, the inlet valve that controls the flow of injection gas between the cooling section or the injection gas heat exchange section and the internal space section is shut off. Insulation method for liquefied gas storage tanks.
In Article 9, Check the internal temperature of the above liquefied gas storage tank, and through the above internal temperature The above injection gas cooling unit or injection gas heat exchanger cools the injection gas. Insulation method for liquefied gas storage tanks.
In Article 9, The blower provides a flow force for supplying the injection gas flowing through the internal space to the injection gas heat exchanger. 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, wherein a cooled injection gas is injected into the internal space of the liquefied gas storage tank to fundamentally block the inflow of heat from the outside of the liquefied gas storage tank, and wherein the leaked gas is discharged to the outside when a gas leak is detected in 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. In addition, there is a problem in that it is difficult to effectively treat gas leakage when it occurs in liquefied gas storage tanks. FIG. 1 is a schematic diagram illustrating the technical configuration of a ship's storage tank insulation system according to the technical concept of the present invention. FIG. 2 is a schematic diagram illustrating a portion of the technical configuration of a storage tank insulation system of a ship according to a first embodiment of the present invention. FIG. 3 is a schematic diagram illustrating the technical configuration of a storage tank insulation system of a ship according to a second 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 the technical configuration of a ship's storage tank insulation system according to the technical concept of the present invention. As described above, the storage