Search

KR-20260062154-A - Insulating system and Insulating method for liquified gas storage

KR20260062154AKR 20260062154 AKR20260062154 AKR 20260062154AKR-20260062154-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, an injection gas cooling unit for providing cooled injection gas to the internal space, and a flow pipe connected between the internal space and the injection gas cooling unit, wherein the injection gas cooling unit cools the injection gas flowing from the internal space and provides the cooled injection gas to the internal space.

Inventors

  • 이준채
  • 최원재
  • 이승철

Assignees

  • 한화오션 주식회사

Dates

Publication Date
20260507
Application Date
20241025

Claims (11)

  1. An internal space formed between the liquefied gas storage tank and the hull; An injection gas cooling unit for providing cooled injection gas to the internal space above; and It includes a flow pipe section connected between the internal space section and the injection gas cooling section, and The injection gas cooling unit cools the injection gas flowing from the internal space and provides the cooled injection gas to the internal space. Liquefied gas storage tank insulation system.
  2. 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 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.
  3. In Paragraph 2, 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.
  4. In Article 1, The temperature of the injection gas cooled through the heat exchanger is set lower than the temperature of the liquefied gas storage tank. Liquefied gas storage tank insulation system.
  5. In Paragraph 3, The above-mentioned outlet pipe includes a gas leak detector for detecting leaked gas leaking from the above-mentioned liquefied gas storage tank and a discharge valve for controlling the flow rate of the injection gas flowing to the injection gas cooling unit. Liquefied gas storage tank insulation system.
  6. 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.
  7. In Article 1, The above internal space is formed between the first barrier and the second barrier. Liquefied gas storage tank insulation system.
  8. In Article 7, The temperature of the injected gas flowing in the aforementioned internal space is set to an intermediate temperature range between the ambient temperature of the liquefied gas storage tank and the internal temperature of the liquefied gas storage tank. Liquefied gas storage tank insulation system.
  9. In Article 1, 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.
  10. 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 the injection gas cooling section, and The above injection gas cooling unit cools the injection gas and injects it back into the internal space. Insulation method for liquefied gas storage tanks.
  11. In Article 10, 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 fundamentally blocks the inflow of heat from the outside of the liquefied gas storage tank by injecting cooled injection gas into the internal space 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 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 ship's storage tank insulation system (1000) includes a liquefied gas storage tank (1100), an injection gas cooling section (1200), a flow pipe section (1300, 1400), and a contro