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BTCA/PUD에 의한 면섬유의 가교반응에서 처리방법이 물성에 미치는 영향
강석환,조인식,황의환,황택성,Kang Suk-Hwan,Cho In-Sik,Hwang Eui-Hwan,Hwang Taek-Sung 한국섬유공학회 2005 한국섬유공학회지 Vol.42 No.6
Cotton fabrics were treated with BTCA and BTCA/PU to improve the winkle recovery property. Various concentrations of BTCA and BTCA/PU were treated on cotton fabrics by UV irradiation (UV intensity) and dry-cure technique (curing temperature). The crosslink reaction could be confirmed by ATR-FTIR spectroscopy. The physical properties such as add-on, WR rating, tensile strength and initial elasticity after the fabric treatment were also investigated. As a result of this study, fabrics treated by UV irradiation appeared to have higher add-on and lower tensile strength than that treated by heat treatment. BTCA/PU, containing PU as an additive, can improve the fabric stiffness resulting from the crosslink reaction in both UV irradiation and heat treatment. It was confirmed by tensile strength and initial elasticity.
컴팩트 석탄 가스화기 개발을 위한 이중선회버너 운전 평가
강석환,류재홍,정석우,정우현,유상오,이도연,윤용승,이진욱,김규태,이민회,Kang, Suk-Hwan,Ryu, Jae-Hong,Chung, Seok-Woo,Jung, Woo-Hyun,Yoo, Sang-Oh,Lee, Do-Yeon,Yun, Yongseung,Lee, Jin-Wook,Kim, Gyoo-Tae,Yi, Min-Hoe 한국에너지학회 2013 에너지공학 Vol.22 No.2
석탄가스화 기술은 청정석탄에너지 기술 중에서 아주 중요한 대안으로 인식되고 있으며, 이에 전 세계적으로 차세대 석탄가스화기라고 할 수 있는 고효율 저비용 석탄가스화기를 개발하고 있다. 본 연구에서도 이러한 목적의 달성을 위하여 저비용으로 구현이 가능한 컴팩트 석탄가스화기를 개발하고 있으며, 다수개의 공급부로 이루어진 일체형 이중선회형 버너를 개발하였다. 개발된 버너의 가스화 운전조건을 확보하기 위하여 미분탄 분배기와 함께 기존의 석탄가스화기 몸체에 설치하여 가스화 실험을 수행하였다. 인도네시아산 아역청탄인 ABK 탄을 사용하여 1.5톤/일의 파일럿 규모로 $6.4{\sim}7.2kg/cm^2$, $1170{\sim}1300^{\circ}C$ 조건에서 운전을 수행하였다. 우선 성능평가보다는 안정적인 가스화기 운전조건을 확보하는데 중점을 두었다. 그 결과, 안정적인 운전조건에서 탄소전환율은 84.0%, 냉가스 효율 52.1%를 확보할 수 있었다. Coal gasification is considered as one of the best alternatives among clean coal technology and new concept next generation technologies are under being developed to achieve low cost as well as high efficiency. In this study we have developed double swirl multi-burner as part of the development of low cost compact gasifier. We installed new concept multi-burner with pulverized coal distributor to the body of existing gasifier for burner test. Gasification test was performed under the condition of $6.4{\sim}7.2kg/cm^2$ and $1170{\sim}1300^{\circ}C$ by using Indonesian ABK (sub-bituminous) coal to get operation condition of new concept multi-burner. Our interest was focused to ensure a stable operating condition rather than the gasifier performance evaluation. As a result, we were able to achieve the carbon conversion of 84% and the cold gas efficiency of 52.1% at the stable operating conditions.
강석환,이영우,강용,한근희,이창근,진경태,손재익,박영성,Kang, Suk-Hwan,Rhee, Young-Woo,Kang, Yong,Han, Keun-Hee,Yi, Chang-Keun,Jin, Gyoung-Tae,Son, Jae-Ek,Park, Yeong-Seong 한국에너지학회 1996 에너지공학 Vol.5 No.2
석탄가스화 복합발전 시스템의 주요 단위 공정인 고온건식 탈황공정에 사용되는 탈황제의 개발을 위한 연구의 일환으로 국내산 철광석과 호주산 철광석에 대해 환원, 황화 및 재생 반응을 수행하였다. 실험 장치로는 TGA와 시료 제조용 고정층 반응기를 이용하였고, BET 표면적, SEM, 탈황/재생 cycle 실험, 반응 온도 변화 및 탈황제의 질량변화곡선 등을 이용하여 세가지 철계 탈황제에 대한 기초반응 특성을 규명하였다. 500-$700^{\circ}C$ 구간에서 반응온도 증가에 따라 탈황반응의 H$_2$S 제거율과 재생반응의 재생율이 증가하였다. Reduction, sulfidation, and regeneration reactions were performed using domestic and Australian iron ore in order to develop a desulfurizing sorbent for the high temperature desulfurization process that is one of major processes in the integrated coal gasification combined cycle (IGCC) system. A TGA (Thermogravimetric Analysis) reactor and a fixed-bed reactor were used. Some basic kinetic information was obtained from BET surface area measurements, SEM photos, cyclic reactions, reaction temperature changes and TGA curves of the sorbents. The rates of both desulfurization and regeneration increased with increasing reaction temperature in the range of 500-700$^{\circ}C$.
파일럿 규모의 공정에서 CO<sub>2</sub>가 함유된 합성가스로부터 합성천연가스(SNG) 생산
강석환,류재홍,김진호,김효식,유영돈,김준우,고동준,강용,Kang, Suk-Hwan,Ryu, Jae-Hong,Kim, Jin-Ho,Kim, Hyo-Sik,Yoo, Young-Don,Kim, Jun-Woo,Koh, Dong-Jun,Kang, Yong 한국화학공학회 2019 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.57 No.3
In SNG (synthetic natural gas) process by proposed RIST(Research Institute of Industrial Science & Technology)-IAE(Institute for Advanced Engineering) (including three adiabatic reactors and one isothermal reactor), the methanation reaction and water gas shift (WGS) reaction take place simultaneously, and the supply of steam with syngas might control the temperature in catalyst bed and deactivate the catalyst. In this study for development of SNG process, the characteristics of the methanation reaction with a Ni-based catalyst by prepared RIST and using a low $H_2/CO$ mole ratio (including $CO_2$ 22%) are evaluated. The operating conditions ($H_2O/CO$ ratio of the $1^{st}$ adiabatic reactor, operating temperature range of $4^{th}$ isothermal reactor, etc.) were reflected the results from previous studies and in the same condition a pilot scale SNG process is carried out. As a results, the pilot scale SNG process is stable and the CO conversion and $CH_4$ selectivity are 100% and 96.9%, respectively, while the maximum $CH_4$ productivity is $660ml/g_{cat}{\cdot}h$. 포항산업과학연구원(RIST, Research Institute of Industrial Science & Technology)-고등기술연구원(IAE, Institute for Advanced Engineering)에서 제안한 합성천연가스(Synthetic Natural Gas, SNG) 제조공정(3개의 단열반응기와 1개의 등온반응기로 구성됨)에서, 합성가스와 함께 스팀을 공급함으로써 메탄화반응과 수성가스전환반응을 동시에 반응시켜 촉매층의 온도와 촉매 비활성화를 제어하였다. SNG 공정개발을 위해 본 연구에서는, 포항산업과학연구원에서 제조한 니켈계 촉매를 사용하여 낮은 $H_2/CO$ 비($CO_2$ 22% 포함) 조건에서의 메탄화반응 특성을 평가하였다. 운전조건(1차 단열반응기의 $H_2O/CO$ 비, 4차 등온반응기의 운전온도 범위 등)은 이전의 연구 결과를 반영하였으며, 동일한 조건을 유지하면서 파일럿 규모의 SNG 공정을 운전하였다. 그 결과, 파일럿 규모의 SNG 공정은 안정적으로 운전되었으며, CO 전환율 100%, $CH_4$ 선택도는 96.9% 그리고 $CH_4$ 생산성은 $660ml/g_{cat}{\cdot}h$의 값을 얻었다.
분체공학 , 유동층 , 고분자 , 재료 ( 무기 , 유기 ) : 가압유동층에서 무연탄 연소시 열전달 특성
강석환(Suk Hwan Kang),한근희(Kun Hee Han),진경태(Gyoung Tae Jin),강용(Yong Kang) 한국화학공학회 2002 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.40 No.2
Heat transfer characteristics between the horizontal tube and the fluidized-bed proper have been investigated in a bench-scale pressurized fluidized-bed combustor for the combustion of anthracite coal. Effects of fluidizing velocity(0.9, 1.1, 1.3m/s), bed temperature(850, 900, 950℃) and amount of excess air(10, 20, 30%) on the individual heat transfer coefficient have been determined. The heat transfer coefficient has increased with increasing bed temperature, while it has decreased with increasing fluidizing gas velocity. The values of heat transfer coefficient in the pressured fluidized-bed combustor have been in the range of 370-720W/㎡K, which are much higher than those of typical value(200W/㎡K) in the atmospheric bubbling fluidized-bed combustor. The heat transfer coefficients have been well correlated in terms of operating parameters by way of dimensionless as well as dimensional forms.
강석환(Suk Hwan Kang),한근희(Kun Hee Han),진경태(Gyoung Tae Jin),강용(Yong Kang) 한국공업화학회 2002 공업화학 Vol.13 No.1
유동층 연소로에서 국내 무연탄(발열량 : 4655㎉/㎏)의 연소특성을 고찰하였다. 실험 변수인 압력(200~600k㎩), 유동층 온도(850~ 950 ℃), 과잉공기의 양(10,20,30%) 등이 연소로 내부에서 연소효율과 열전달계수에 미치는 영향을 규명하였다. 실험결과. 연소효율은 연소온도, 압력 그리고 과잉공기의 비가 증가할수록 증가하였으며 본 연구의 실험범위에서 연소효율은 80~99%으로 나타났다. 가압유동층 연소로내의 열전달계수는 223~571 W/㎡K로 나타났다. 열전달계수는 연소온도와 압력이 증가할수록 증가하였으나, 과잉공기의 비가 증가할수록 감소하는 것으로 나타났다. 열전달계수는 무차원군인 Nu, Re, 그리고 Pr에 의한 상관식으로 나타낼 수 있었다. Combustion characteristics of domestic anthracite coal (calorific heating value : 4655 ㎉/㎏) have been studied in a pressurized fluidized bed combustor. Effects of operating variables such as pressure (200~600 k㎩), bed temperature (850~950 ℃) and excess air (10, 20, 30%) on the combustion efficiency and heat transfer coefficient of the combustor have been investigated. As a result of this study, it has been found that the combution efficiency, which increased with increasing the bed temperature, pressure and excess air ratio, was in the range of 80~99% within the experimental conditions of this study. The heat transfer coefficient in a pressurized fluidized bed combustor has been found to be in the range of 233~571 W/㎡. The heat transfer coefficient increased as the bed temperature and pressure were increased, but it decreased with increased the excess air ratio. The heat transfer coefficient was expressed in terms of diamensionless groups of Nu, Re and Pr.