• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2007.06a
• /
• pp.197-198
• /
• 2007

• Journal of the Society of Naval Architects of Korea
• /
• v.30 no.4
• /
• pp.83-92
• /
• 1993

This paper describes structural safety assessment techniques against crygenic temperature to design MRV type B LNG tank system. The following items are detail with in detail. (1) Leakage estimation of LNG through the propagating clacks at tank plate was performed and design of the range of catch basin(2ndary barrier) was followed to ensure the safety of ship structures against leaked LNG. (2) Temperature distribution analysis for cargo hold and skirt system was carried out using the steady state heat transfer analysis model for spherical LNG tank system. (3) Thermal stress distribution of skirt and tank system was calculated, where very stiff thermal variation was shwn through item(2) analysis.

• Proceedings of the Korean Society of Propulsion Engineers Conference
• /
• 2011.11a
• /
• pp.795-796
• /
• 2011

During launch process, ground support facilities perform its duty in established processes by communications with launch vehicle. All ground support systems are operated independently or organically. This paper studied algorithm of propellant filling process and method for liquid oxygen filling system in launch operation in Naro space complex.

• Proceedings of the Korean Society of Propulsion Engineers Conference
• /
• 2011.11a
• /
• pp.793-794
• /
• 2011

In launch process, propellants should be supplied with established temperature range for engine normal operation. In order to satisfy this temperature condition, propellant feeding systems should be considered some effects during operation. This paper studied liquid oxygen filling system operation process and cooling method of liquid oxygen during launch process.

• Proceedings of the Membrane Society of Korea Conference
• /
• 1994.03a
• /
• pp.1-21
• /
• 1994

There are growing needs to produce relatively high purity (99.0% or higher) oxygen at low cost. For small scale production, both pressure swing adsorption (PSA) and membrane process are competitve and less expensive or more convient than well known crygenic fractionation technology. A continuous membrane colume (CMC) combined with a PSA oxygen generator can be employed to produce high purity oxygen continuosly. The oxygen-enriched gas generated by a PSA unit, with a concentration of 93-94%, is fed to the CMC that consists of three modules of poly(imide) hollow fibers. Several experiments were conducted by varying parameters, such feed flow rate, transmenbrane pressure drop, stage cut, and feed location in order to obtain a high oxygen concentration above 99.0%. A two-series unit mode was also employed with CMC operation to optimize the given membrane area.

• Proceedings of the Korean Society of Propulsion Engineers Conference
• /
• 2010.11a
• /
• pp.676-677
• /
• 2010

In Naro Space Center, Naro launch vehicle launched 2 times. Launch pad for Naro launch vehicle in Naro space center equipped propellant feeding facility for operating launch process. This paper studied development process and operating method for liquid oxygen filling system of cryogenic propellant systems in launch pad propellant feeding facility.

• Journal of the Korean Institute of Gas
• /
• v.8 no.1 s.22
• /
• pp.37-47
• /
• 2004

Pressure swing adsorption (PSA) process using CMS as an oxygen purifier was developed to produce high purity oxygen over $99\%$ with high productivity. The cyclic performances such as purity, recovery, and productivity of PSA process were compared experimentally and theoretically under the non-isothermal condition. A binary ($O_2$/Ar 95:5 vol.$\%$) and two kinds of ternary ($O_2/Ar/N_2$ 95:4:1 and 90:4:6 vol.$\%$) mixtures were used as feed gases. The developed process with the consecutive two blowdown steps produced the oxygen with $99.8\%$ purity and $56\%$ recovery from $95\%$ oxygen containing feed. However, in the feed with $90\%$ oxygen, the $O_2$ Purity was decreased up to $97.3\%$. In addition, because the cyclic performances of the suggested process was significantly affected by the diffusion rate, the non-isothermal model with the the modified LDF model was applied for the process simulation. The concentration-dependent rate parameter of the applied rate model was incorporated with the Langmuir isotherm.