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고준석,박성제,김기덕,홍용주,고득용,김효봉,염한길,Ko, Junseok,Park, Seong-Je,Kim, Ki-Duck,Hong, Yong-Ju,Koh, Deuk-Yong,Kim, Hyobong,Yeom, Hankil 대한기계학회 2013 대한기계학회 논문집. Transactions of the KSME. C, 산업기술과 혁신 Vol.1 No.1
LNG 극저온기계기술 시험인증센터에 구축되는 LNG 선박용 펌프 및 압축기 성능시험에서 발생하는 증발가스는 안전을 위하여 전량 회수가 요구된다. 본 논문에서는 36 MTD 용량의 천연가스 재액화 시스템에 대한 기본 설계 연구를 수행하였다. 대기압, $-60^{\circ}C$, 일반적인 도시가스 조성비, 1,500 kg/hr 유량의 공급 가스를 기본 설계 조건으로 하여 공정 설계가 이루어졌고, 입구 온도 조건 및 가스 조성비에 따른 LNG 생산량 또한 계산하여 다양한 입구 설계 조건에 따른 시스템의 성능 변화를 비교, 분석하였다. 공정 설계 외에도 재액화 시스템의 핵심 기기인 송풍기, 압축기, 극저온 열교환기, 컴팬더의 제작 사양이 도출되었으며, 전력 및 냉각수의 유틸리티 요구조건 또한 기본 설계를 통해 도출되었다. In this paper, we carried out the basic design of 36 MTD natural gas BOG re-liquefaction system to recover the generated natural gas during performance test of LNG pump and natural gas compressor. The re-liquefaction process of natural gas is designed to have 1500 kg/h of liquefaction rate with reverse Brayton refrigeration cycle. With the designed process, the variation of liquefaction rate is calculated for various inlet conditions of feed gas. From results, the liquefaction rate is more sensitive for inlet temperature than gas composition. The specifications of equipments such as gas blower, natural gas compressor, cryogenic heat exchanger and nitrogen compander are determined on the basis of the designed process. The requirement of power consumption and cooling water are also determined through the basic design.
고준석(Junseok Ko),염한길(Hankil Yeom),홍용주(Yong-Ju Hong),박성제(Seong-Je Park),서정균(Jeong-Kyun Seo),김효봉(Hyobong Kim),고득용(Deuk-Yong Koh) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Hydrogen is the most promising energy carrier in near future. Liquid hydrogen has advantages in storage and transportation due to its higher density than gaseous hydrogen. Gaseous hydrogen at atmospheric condition is liquefied through cryogenic liquefaction process. This paper describes design of such cryogenic liquefaction cycles. We designed hydrogen liquefaction cycle on the basis of Linde-Hampson liquefaction system. We selected several different cycles as use of GM cryocooler and pre-cooler with liquid nitrogen. From results of analysis, principal parameters such as yield of liquid hydrogen, liquefaction rate and energy consumption are deeply discussed.
고준석(Junseok Ko),박성제(Seong-Je Park),홍용주(Yong-Ju Hong),염한길(Hankil Yeom),최준석(Jun-Seok Choi),윤의수(Eui Soo Yun) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
This paper describes some of issues associated with test facilities which will be constructed in LNG & cryogenic equipment test and facility center. The natural gas is stored and transported in a liquid state because its liquid density is 600 times greater than gas density. The storage and transportation of LNG (Liquified Natural Gas) are accompanied with cryogenic cooling processes which require various cryogenic equipments including compressor, pump, valve, heat exchanger and auxiliary components. Test facilities of such cryogenic equipments are pre-studied and designed. LNG & cryogenic equipment test and evaluation center will play a role of the performance test and the certification.
양방향 선형 발전기를 적용한 초소형 열병합 발전용 스털링엔진 개발
고준석(Junseok Ko),박성제(Seong-Je Park),김효봉(Hyobong Kim),홍용주(Yong-Ju Hong),강인수(In-Su Kang),이청수(Chung-Soo Lee) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
This paper describes the development of gamma-type Stirling engine with dual-opposed linear alternators for domestic micro-CHP(Combined Heat and Power) system. The developed Stirling engine has one displacer and two power piston which are supported by flexure springs. Two power pistons oscillate with symmetric sinusoidal displacement and are connected with moving magnet type linear alternators for power generation from PV work. To operate Stirling engine, combustion heat of natural gas is supplied to hot-end and heat is rejected from cold-end by cooling water. In performance tests of Stirling engine, several parameters of pressure, temperature, displacement and power are measured to analyze thermal, dynamic, electric characteristics of Stirling engine. From performance tests, the developed Stirling engine shows 920 W of electric power generation at its normal operation condition.
고준석(Junseok Ko),염한길(Hankil Yeom),홍용주(Yong-Ju Hong),박성제(Seong-Je Park),김효봉(Hyobong Kim) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
This paper describes experimental investigation on neon refrigeration system. A commercial helium compressor was used for compressing neon gas, because neon is an inert gas like as helium and thus, large amount of compression heat is generated in compression process due to its high specific heat ratio. In this paper, neon refrigeration system is fabricated and tested. In cooling performance test, the effect of radiation shield is investigated. With experimental results, the effectiveness of fabricated heat exchangers is analyzed and discussed. From experimental results, 44.0 K and 58.2 K of the lowest temperature are measured according to existence of radiation shield.
고준석(Junseok Ko),홍용주(Yong-Ju Hong),김효봉(Hyobong Kim),강인수(In-Su Kang),이청수(Chung-Soo Lee),박성제(Seong-Je Park) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
This paper describes experimental measurements of generating efficiency of Stirling engine for domestic small-scale CHP(Combined Heat and Power) system. In experiments, 1 ㎾ class free piston Stirling engine (FPSE) was fabricated and tested. A heat is supplied to hot end of engine by the combustion of natural gas and converted to electric power by linear alternator which is assembled with power piston. The electric parameters such as voltage, current and phase are measured for variable flow rate of fuel gas. Especially, generating efficiency of FPSE is measured with three different measurement methods. From experimental results, a FPSE shows the increase of generating efficiency as increasing fuel gas flow rate and, over 20 % of efficiency for the case of 1 ㎾ electric power generation.