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유동층 반응기에서 세 가지 석회석의 CO<sub>2</sub> 흡수능력에 미치는 반복횟수와 SO<sub>2</sub> 농도의 영향
류호정,Ryu, Ho-Jung 한국공업화학회 2006 공업화학 Vol.17 No.1
유동층 반응기에서 세 가지 석회석의 $CO_2$ 흡수능력에 미치는 반복횟수와 $SO_2$ 농도의 영향을 연구하였다. 측정된 $CO_2$ 흡수능력은 반복횟수가 증가하고 $SO_2$ 농도가 증가함에 따라 감소하였다. 한편 $SO_2$ 흡수능력은 반복횟수와 $SO_2$ 농도가 증가함에 따라 증가하였다. 총괄칼슘이용률은 반복횟수가 증가함에 따라 감소하였으나 총괄칼슘이용률에 대한 $SO_2$ 농도의 영향은 석회석의 종류에 따라 다른 경향을 나타내었다. Strassburg 석회석의 경우 총괄칼슘 이용률은 $SO_2$ 농도가 증가함에 따라 감소하는 반면, Luscar 및 단양 석회석의 경우에는 본 연구의 실험범위 내에서 $SO_2$ 농도에 무관한 경향을 나타내었다. 본 연구의 실험결과에 의하면 연소배가스 중 $SO_2$의 존재는 석회석의 $CO_2$ 흡수능력을 감소시키며 석회석의 황하반응 경향이 $CO_2$ 흡수능력에 영향을 미치는 것으로 나타났다. Effects of multiple-cycle operation and $SO_2$ concentration on $CO_2$ capture characteristics of three limestones were investigated in a fluidized bed reactor. For each of these sorbents, the measured $CO_2$ capture capacity decreased as the number of cycles increased and as the $SO_2$ concentration increased. On the other hand, the $SO_2$ capture increased with the increased number of cycles and the $SO_2$ concentration. The total calcium utilization decreased as the number of cycles increased, but the effect of $SO_2$ concentrations on the total calcium utilization depended on the type of limestone. For Strassburg limestone, the total calcium utillization decreased with increasing $SO_2$ concentration. However, for Luscar and Danyang limestones, the total calcium utilization was almost independent of $SO_2$ concentration for the range investigated. The results showed that $SO_2$ in flue gas reduced the $CO_2$ capture capacity of limestone and that the sulfation pattern affected the $CO_2$ capture capacity.
케미컬루핑 연소시스템을 위한 두 가지 산소전달입자들의 고체순환 특성
류호정,이도연,남형석,조성호,백점인,RYU, HO-JUNG,LEE, DOYEON,NAM, HYUNGSEOK,JO, SUNG-HO,BAEK, JEOM-IN 한국수소및신에너지학회 2018 한국수소 및 신에너지학회논문집 Vol.29 No.4
To confirm the operating range of two oxygen carriers for chemical looping combustion system, the effects of operating variables on solid circulation rate were measured and discussed using a two-interconnected circulating fluidized bed system at ambient temperature and pressure. Moreover, suitable operating ranges to avoid choking of the fast fluidized bed (air reactor) were confirmed for two oxygen carriers. A continuous long-term operation of steady-state solid circulation more than 24 hours was also demonstrated within the operating windows. Finally we could confirm that those two oxygen carriers are suitable for chemical looping combustion system with high solid circulation rate and smooth solid circulation.
분체공학 , 유동층 , 고분자 , 재료 ( 무기 , 유기 ) : 기체유동층에서 슬러그 특성 ; 1. 최소슬러깅속도와 슬러그 빈도
류호정(Ho Jung Ryu),손재익(Jae Ek Son),김상돈(Sang Done Kim),최정후(Jeong Hoo Choi) 한국화학공학회 2001 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.39 No.5
In order to understand the slugging regime comprehensively, the characteristics of slugging have been studied experimentally in gas fluidized beds. 1`he onset velocity of slugging and the properties of slug were measured in gas fluidized beds(bed A: 0.055 m i.d., 2.0 m height, bed B: 0.1 m i.d. and 2.5 m height) using sand(specific surface mean diameter: 0.286 ㎜) and FCC(FCC A, specific surface mean diameter: 0.082 ㎜, FCC B, specific surface mean diameter: 0.091 ㎜) as bed materials with variations of gas velocity, height from the distributor plate, bed height at minimum fluidization, column diameter and particle properties. The minimum slugging velocity decreased with increasing height from the distributor plate, however, increased with increasing bed height at minimum fluidization and column diameter. However, the effect of particle properties was found to be dependent on the column diameter. The minimum slugging velocity of sand was higher than that of FCC in the column of 0.055 m inside diameter, however, that of FCC higher than that of sand in the column of 0.10 m inside diameter. The slug frequency decreased with increasing gas velocity, height from the distributor plate and bed height at minimum fluidization, however, increased with column diameter. The effect of gas velocity on slug frequency diminished as gas velocity increased. The effect of height from the distributor plate on slug properties decreased as the bed height at minimum fluidization increased. The slug frequency of FCC was higher than that of sand at the same excess gas velocity.
0.5 MWth 급 케미컬루핑 연소시스템의 공기반응기 고체 체유량에 미치는 조업변수의 영향
류호정(Ho-Jung Ryu),이도연(Doyeon Lee),남형석(Hyungseok Nam),조성호(Sung-Ho Jo),이승용(Seung-Yong Lee),백점인(Jeom-In Baek) 한국에너지기후변화학회 2018 에너지기후변화학회지 Vol.13 No.2
Effects of gas velocity and solid circulation rate on solid holdup profiles in an air reactor were measured and investigated in a 0.5 MWth chemical looping combustion system. The measured solid circulation rate increased as the gas input velocity through the left side of lower loop seal and the measured solid holdup increased as the solid circulation rate increased. However, solid holdup decreased as the gas velocity in the air reactor increased. The choking was observed at low gas velocity and high solid circulation rate conditions. Therefore, a suitable operating condition should be selected to avoid the choking in the air reactor by adjusting gas velocity in the air reactor and solid circulation rate.