Calculation of Boil-Off Gas (BOG) Generation of KC-1 Membrane LNG Tank with High Density Rigid Polyurethane Foam by Numerical Analysis

Jeong, Hyeon-won; Shim, W. Jaewoo

doi:10.1515/pomr-2017-0012

Cited by 18 publications

(5 citation statements)

References 24 publications

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“…Its height, determined by the total height of the cryocooler's cold end and the condenser on it, is ℎ = 30 mm. Of the solid foams recommended for cryogenic applications [36][37][38][39], CRYOPIR 50 with 𝜌 ≥ 48 𝑘𝑔/𝑚 3 density was used to make the insulation ring. The dependence of thermal conductivity on temperature in the range from 80 to 280 K, shown in figure 5(a), was obtained by interpolation of its discrete values (marked with dots) specified…”

Section: Thermal Network Model For the Recondensation Modementioning

confidence: 99%

Practical aspects of hybrid cooling devices engineering design for HPGe detectors

Malgin

2024

J. Inst.

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The article discusses some practical aspects of engineering design associated with the use of Stirling cryocoolers in liquefiers of hybrid cooling devices for HPGe detectors. A feature of hybrid cooling devices is the presence of two modes: the recondensation mode when the cryocooler is operating, and the power interruption mode with a non-renewable LN 2 boil-off. Based on the Thermal Networks Method, models for each mode are proposed, for analyzing heat fluxes between standard components forming the liquefier unit. The proposed models were validated by comparing calculated parameters of the transition process between the two above-mentioned operating modes with those obtained experimentally. It is shown that the minimization of heat gain through the liquefier unit into Dewar for both operating modes of the hybrid cooling device leads to contradictory engineering design requirements. Preliminary conclusions based on the thermal network models are confirmed experimentally on a serial hybrid cooling device, produced by the Baltic Scientific Instruments Company. This resulted in practical recommendations on the choice of condenser position, which depended on operating conditions of hybrid cooling device, for example as a laboratory equipment or as a part of remote radiation monitoring stations.

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Section: Thermal Network Model For the Recondensation Modementioning

confidence: 99%

Practical aspects of hybrid cooling devices engineering design for HPGe detectors

Malgin

2024

J. Inst.

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“…Table 1 shows compositions of the LNG based on the gross heating values and lower heating values. The boil-off ratio (BOR) and mass flowrate of the boil-off gas are calculated using Equations ( 1) and ( 2) [29,30].…”

Section: Boil-off Gasmentioning

confidence: 99%

A Novel Control Strategy on Stable Operation of Fuel Gas Supply System and Re-Liquefaction System for LNG Carriers

Hwang

Jung

2021

Energies

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Liquefied natural gas has attracted attention through an explosive increase in demands and environmental requirements. During this period, the Energy Efficiency Design Index (EEDI), which was adopted by the International Maritime Organization, expecting to significantly reduce CO2 from ships, has become an important key. It has triggered a change in use from steam turbine systems and dual fuel diesel electrics to high-efficiency main engines such as ME-GI engines to meet the EEDI requirements. However, since the ME-GI engines use 300 bar of fuel gas pressure, it is necessary to resolve problems of the pressure controllability and to prevent the reductions of the re-liquefaction amount caused by clogging of the lubricant mixed with the fuel gas during the compression. The purpose of this study is to propose a novel control strategy with a newly developed configuration for controlling the pressure so as not to trip the BOG compressors when the ME-GI engines are tripped, and for preventing a reduction on re-liquefaction amount. Unlike the typical configuration used in the current vessels, this proposal separately provides the fuel gas at 150 bar without lubricants to the re-liquefaction. In addition, three control strategies are proposed, depending upon the application of multi-controllers and the location of the pressure transmitters. A simulation was conducted to verify the efficacy of the proposed method, focusing on the controllability of the pressure and the re-liquefaction amount, in comparison with the typical configuration. As results of the simulation, the proposal showed excellent controllability without trips of the BOG compressors even in abnormal conditions and confirmed the great re-liquefaction performance.

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“…Recently, South Korea has been developing an LNG CCS line called KC series, with PUF as an insulation material. PUF has already been employed for insulation in KC-1 [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of PVC-Type Insulation Foam Material for Cryogenic Applications

Kim

et al. 2023

Polymers

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With the International Maritime Organization (IMO) reinforcing environmental regulations on the shipbuilding industry, the demand for fuels, such as liquefied natural gas (LNG) and liquefied petroleum gas (LPG), has soared. Therefore, the demand for a Liquefied Gas Carrier for such LNG and LPG also increases. Recently, CCS carrier volume has been increasing, and damage to the lower CCS panel has occurred. To withstand liquefied gas loads, the CCSs should be fabricated using a material with improved mechanical strength and thermal performance compared with the conventional material. This study proposes a polyvinyl chloride (PVC)-type foam as an alternative to commercial polyurethane foam (PUF). The former material functions as both insulation and a support structure primarily for the LNG-carrier CCS. To investigate the effectiveness of the PVC-type foam for a low-temperature liquefied gas storage system, various cryogenic tests, namely tensile, compressive, impact, and thermal conductivity, are conducted. The results illustrate that the PVC-type foam proves stronger than PUF in mechanical performance (compressive, impact) across all temperatures. In the tensile test, there are reductions in strength with PVC-type foam but it meets CCS requirements. Therefore, it can serve as insulation and improve the overall CCS mechanical strength against increased loads under cryogenic temperatures. Additionally, PVC-type foam can serve as an alternative to other materials in various cryogenic applications.

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Calculation of Boil-Off Gas (BOG) Generation of KC-1 Membrane LNG Tank with High Density Rigid Polyurethane Foam by Numerical Analysis

Cited by 18 publications

References 24 publications

Practical aspects of hybrid cooling devices engineering design for HPGe detectors

Practical aspects of hybrid cooling devices engineering design for HPGe detectors

A Novel Control Strategy on Stable Operation of Fuel Gas Supply System and Re-Liquefaction System for LNG Carriers

Evaluation of PVC-Type Insulation Foam Material for Cryogenic Applications

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