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가압 기체 - 고체 유동층에서 내부열원과 유동층간의 열전달
강용(Yong Kang),김영렬(Young Real Kim),고명한(Myung Han Ko),서용칠(Yong Chil Seo),진경태(Gyoung Tae Jin),손재익(Jae Ek Son),김상돈(Sang Done Kim) 한국화학공학회 1997 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.35 No.2
Heat transfer characteristics between the immersed heater and the bed were investigated in a pressurized gas-solid fluidized bed of 0.15m ID and 3.58m in height. Effects of operating pressure and temperature and gas flow rate on the local and overall immersed heater-to-bed heat transfer coefficient were examined. The increase of operating pressure can contribute to the thermal stability of the pressurized gas-solid fluidized bed. The local heat transfer coefficient increased and approached a almost constant value along with the height in the heater zone, and the convergence occurred more early with an increase in the pressure. The overall heat transfer coefficient increased with increasing operating temperature and pressure, but it exhibited its maximum value with the variation of gas flow rate. The heat transfer coefficient was well correlated in terms of dimensionless groups as N_(it)=0.083P_r^(0.33) P_d^(0.08) N_(it)=0.105P_r^(0.31) P_e^(0.11)
선도원,배달희,한근희,손재익,강용,위영호,이정수,지평삼 ( Do Won Shun,Dal Hee Bae,Keun Hee Han,Jae Ek Son,Yong Kang,Young Ho Wee,Jung Su Lee,Pyung Sam Ji ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.3
Combustion characteristics of Korean anthracite with heating value of 4,529㎉/㎏ and ash content of 38% in a. circulating fluidized bed test unit was investigated. Feed coal was received from the mines of Samchuk province and sized to average diameter of 0.39 ㎜. The effect of coal feed rate on temperature profiles, the effect of excess air on combustion efficiency, sorbent effect on desulfurization, and the effect of operating variables on the emission of SO_χ and NO_χ were monitored during opearation. Highest combustion efficiency of 96% was attained at the excess air ratio of l5%. Sulfur retention of 92% was achieved at the Ca/S mole ratio of 2.3. Carbon monoxide emission was varied between 210-720 ppm according to combustor temperature. Conversion of fuel nitrogen to NO_χ varied 4-10% by primary air ratio.
가압유동층 석탄연소로에서 압력이 연소특성에 미치는 영향
송병호,강용,서용칠,진경태,손재익,김상돈 ( Byung Ho Song,Yong Kang,Yong Chil Seo,Gyoung Tae Jin,Jae Ek Son,Sang Done Kim ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.5
The effect of system pressure on the performance of a pressurized fluidized bed coal combustor(carbon combustion efficiency, bed carbon loading, gaseous concentration profile) has been studied by a PFRC model. The behavior of bubbling bed of Geldart B group does not change by pressurization. The more increase in the carbon combustion efficiency can be obtained by pressurization at conditions of the lower temperature and higher gas velocities. At the bed temperature of 700℃, 5% increase in the carbon efficiency can be obtained with 15 atm. The carbon efficiency increases due to larger oxygen concentration, whereas the bed carbon loading also slightly increases with an increase in system pressure.
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$^{\circ}C$.