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Simulation of a bubbling fluidized bed process for capturing CO2 from flue gas
최정후,이창근,Sung-Ho Jo,Ho-Jung Ryu,Young Cheol Park 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.2
We simulated a bubbling bed process capturing CO2 from flue gas. It applied for a laboratory scale processto investigate effects of operating parameters on capture efficiency. The adsorber temperature had a stronger effectthan the regenerator temperature. The effect of regenerator temperature was minor for high adsorber temperature. Theeffect of regenerator temperature decreased to level off for the temperature >250 oC. The capture efficiency was ratherdominated by the adsorption reaction than the regeneration reaction. The effect of gas velocity was as appreciable asthat of adsorber temperature. The capture efficiency increased with the solids circulation rate since it was ruled by themolar ratio of K to CO2 for solids circulation smaller than the minimum required one (Gs, min). However, it leveled offfor solids circulation rate >Gs, min. As the ratio of adsorber solids inventory to the total solids inventory (xw1) increased,the capture efficiency increased until xw1=0.705, but decreased for xw1>0.705 because the regeneration time decreasedtoo small. It revealed that the regeneration reaction was faster than the adsorption reaction. Increase of total solids inventoryis a good way to get further increase in capture efficiency.
Type transition in onset condition of turbulent fluidization
최정후,Ho-Jung Ryu,이창근 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.10
The type transition in onset condition of turbulent fluidization in gas fluidized beds was investigated to obtain the relation representing more precise roles of physical properties of gas and solid particles. The type transition in onset condition of turbulent fluidization occurs at Archimedes number of 20.87 by type transition of bubble breakup. The maximum stable bubble diameter (d_bmax) is greater than the equilibrium bubble diameter (d_beq) in the region, Ar<20.87, but d_(beq)>d_(bmax) in the region, Ar>20.87. Therefore, the onset of turbulent fluidization is determined in the region,Ar<20.87, by dbeq and in the region, Ar>20.87, by d_(bmax) as the limit of bubble growth. The u_c decreases in the region,Ar<20.87, but increases in the region, Ar>20.87 as temperature increases.
보문: 미립지공학·유동층·기후변화대응기술·연료전환기술 ; 연소기체로부터 CO2를 포집하는 기포 유동층 공정에 관한 모델
최정후 ( Jeong Hoo Choi ),윤필상 ( Pil Sang Youn ),김기찬 ( Ki Chan Kim ),이창근 ( Chang Keun Yi ),조성호 ( Sung Ho Jo ),류호정 ( Ho Jung Ryu ),박영철 ( Young Cheol Park ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.3
본 연구는 연소기체로부터 CO2 기체를 포집하는 기포 유동층 흡착 및 재생 반응기 공정의 주요 운전변수의 영향을 조사하기 위해서 단순화된 공정모델을 개발하였다. 반응속도와 반응기에서 고체입자의 평균체류시간을 이용하여 흡착 탑과 재생탑에서 각 반응 전환율을 계산하였다. 실험실 규모 기포 유동층 공정에 적용하여 CO2 포집효율에 대한 온도, 기체유속, 고체순환속도, 연소기체 중 수분농도의 영향을 조사하였다. CO2 포집효율은 흡착탑의 온도 혹은 유속이 증가 함에 따라서 감소하였다. 그러나 연소기체의 수분농도 혹은 재생탑의 온도가 증가함에 따라서 증가하였다. 계산된 CO2 포집효율은 측정값과 잘 일치하였다. 그러나 본 모델은 CO2 포집효율에 대한 고체순환속도의 영향과 잘 일치하지 않 았다. 이의 해석을 위해서는 기체-고체 접촉효율에 대한 이해가 더 필요하였다. This study developed a simple model to investigate effects of important operating parameters on performance of a bubbling-bed adsorber and regenerator system collecting CO2 from flue gas. The chemical reaction rate was used with mean particles residence time of a reactor to determine the extent of conversion in both adsorber and regenerator reactors, Effects of process parameters - temperature, gas velocity, solid circulation rate, moisture content of feed gas - on CO2 capture efficiency were investigated in a laboratory scale process, The CO2 capture efficiency decreased with increasing temperature or gas velocity of the adsorber. However, it increased with increasing the moisture content of the flue gas or the regenerator temperature. The calculated CO2 capture efficiency agreed to the measured value reasonably well. However the present model did not agree well to the effect of the solid circulation rate on CO2 capture efficiency. Better understanding on contact efficiency between gas and particles was needed to interpret the effect properly.
류호정(Ho Jung Ryu),최정후(Jeong Hoo Choi),이창근(Chang Keun Yi),선도원(Do Won Shun),손재익(Jae Ek Son),김상돈(Sang Done Kim) 한국화학공학회 1999 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.37 No.3
Effects of height from the distributor plate and bed height at minimum fluidization on the minimum slugging velocity have been investigated in a gas fluidized bed(0.1 m i.d. and 2.5 m height) using sand(mean diameter : 0.286 ㎜, apparent density : 2,561 ㎏/㎥) as bed material. Minimum slugging velocity decreased with increasing height from the distributor plate, however, increased with increasing bed height at minimum fluidization. A model has been proposed to predict the minimum slugging velocity based on bubble size correlation. The proposed model can predict the present and previous experimental results reasonably well.
기체 유동층에서 입자 비산속도 상관식에 의한 수송속도의 예측
원유섭,무하매드 샤자드 쿠람,정아름,최정후,류호정,Won, Yoo Sube,Khurram, Muhammad Shahzad,Jeong, A Reum,Choi, Jeong-Hoo,Ryu, Ho-Jung 한국화학공학회 2017 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.55 No.5
기체 유동층에서 입자비산속도에 관한 상관식을 사용하여 입자의 수송속도를 예측하는 모델을 제안하였다. Choi 등과 Li와 Kato의 상관식을 사용하여 emptying time 방법을 모사하였다. 기체속도의 단위에 의한 영향을 배제하기 위해서, 기체속도를 종말속도로 나눈 무차원 속도를 x-축의 값으로 사용하였다. y-축은 입자비산속도의 역수를 사용하였다. 기체속도를 증가시킬 때, y-값의 감소 기울기가 절대값으로 0.398 [$m^2s/kg$]를 나타내는 무차원 속도를 수송속도로 간주하였다. 모델의 예측값은 고온, 고압에서도 측정값과 비교적 잘 일치하였다. A model for predicting the transport velocity was proposed using the correlation of the particle entrainment rate in the gas fluidized bed. The emptying time method was simulated using correlations of Choi et al. and Li and Kato. In order to exclude the influence of the unit of the gas velocity, the dimensionless velocity obtained by dividing the gas velocity by the terminal velocity was used as the value of the x-axis. The inverse of the particle entrainment rate was used as the value of the y-axis. When increasing the gas velocity, the non-dimensional velocity, at which the decreasing slope of the y-value is 0.398 [$m^2s/kg$] in absolute value, was considered as the transport velocity. The transport velocity predicted by the model was in good agreement even at high temperature and high pressure.