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장정국,신용섭,최용준,이제근,전해수 ( Jeong Gook Jang,Yong Seop Shin,Yong Jun Choi,Jea Keun Lee,Hai Soo Chun ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.3
상온 2단 선회류 유동층에서 하단 유동층으로 공급된 연료 입자 중 하단 가스공탑속도 변화에 따른 상단으로의 입자 유입속도를 파악하였다. 하단 가스공탑속도 증가에 따라 단위시간당 입자의 상단 유입량은 증가하는 경향을 보였으며, 본 연구의 하단 가스공탑속도 범위(U_(o1)=0.9-1.3m/s) 내에서 상단으로의 입자 유입량은 하단 유동층으로 공급되는 전체 입자량의 약 35-48% 범위에 해당되었다. 입경별 상단으로의 입자 유입속도를 측정한 결과, 입자의 종말속도가 하단 가스공탑 속도보다 큰 입자들은 거의 강단으로 유입되지 못하였다. 그러나 입자의 종말속도가 하단 가스공탑속도보다 작은 입자들의 경우에는 하단으로 공급된 시료입자 중 상단으로 유입된 입자의 분율은 하단 가스공탑속도가 증가하고 입경이 감소할수록 증가하였으며, 무차원 slip velocity가 1에 접근하게 되면 하단으로 공급된 연료입자 중 거의 대부분이 상단으로 유입되는 경향을 보였다. 또한 하단으로 공급된 연료입자 중 상단으로 유입되는 입자의 분율은 아래 식과 같이 무차원 slip velocity에 대하여 지수함수적인 상관관계를 가졌으며, 이 때 상관계수는 0.89이었다. (수식) The rate of particles entrained from the lower stage to the upper stage according to the primary superficial air velocity are investigated in a cold model two-stage swirl-flow fluidized bed combustor. The total entrainment rate increases with the primary superficial air velocity and ranges from 35 percent to 48 percent of particles fed into the lower bed under the operating conditions(U_(o1)=0.9-1.3 m/s). The particles whose terminal velocity is higher than the primary superficial air velocity may not be entrained from lower stage to the upper stage. However, in the case of particles whose terminal velocity is lower than the primary superficial air velocity, the entrainment rate of particles increases as the particle size becomes smaller and/or the primary superficial air velocity increases. Further, the particles whose dimensionless slip velocity approaches to unity are almost entrained. The entrainment rate can be correlated with the dimensionless slip velocity as follows: (수식)
상온 2 단 선회류 유동층에서 상단으로의 입자 유입속도
장정국,신용섭,최용준,이제근,전해수 ( Jeong Gook Jang,Yong Seop Shin,Yong Jun Choi,Jea Keun Lee,Hai Soo Chun ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.3
The rate of particles entrained from the lower stage to the upper stage according to the primary superficial air velocity are investigated in a cold model two-stage swirl-flow fluidized bed combustor. The total entrainment rate increases with the primary superficial air velocity and ranges from 35 percent to 48 percent of particles fed into the lower bed under the operating conditions(U_(o1)=0.9-1.3 m/s). The particles whose terminal velocity is higher than the primary superficial air velocity may not be entrained from lower stage to the upper stage. However, in the case of particles whose terminal velocity is lower than the primary superficial air velocity, the entrainment rate of particles increases as the particle size becomes smaller and/or the primary superficial air velocity increases. Further, the particles whose dimensionless slip velocity approaches to unity are almost entrained. The entrainment rate can be correlated with the dimensionless slip velocity as follows: (수식)
소화 하수슬러지의 유동층 소각 ( 1 ) - 단단 유동층 소각특성 -
이제근,이기호,장정국,이남수,임종성,전해수 ( Jea Keun Lee,Ki Ho Lee,Jeong Gook Jang,Nam Soo Lee,Jong Sung Lim,Hai Soo Chun ) 한국화학공학회 1992 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.30 No.2
Combustion characteristics of digested sewage sludges dried in ambient condition were measured in a laboratory scale fluidized bed incinerator. In spite of the low heating value(1050 ㎉/㎏) and the high moisture content(21%) of the sludge, steady state combustion could be obtained without addition of an auxiliary fuel. Addition of bed material was not needed in the experiment. The combustion efficiency was achieved over 94% due to the high combustion rate of the sludge in the freeboard. Emissions of NO_χ, and SO₂ranged 6.1-16.2 ppm and 830-1310 ppm, respectively, in given experimental conditions.
이제근,이기호,장정국,임준혁,임종성,전해수 ( Jea Keun Lee,Ki Ho Lee,Jeong Gook Jang,Jun Hyuck Lim,Jong Sung Lim,Hai Soo Chun ) 한국화학공학회 1992 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.30 No.4
A series of experiments for incineration of digested sewage sludge in a laboratory scale two-stage swirl-flow fluidized bed incinerator are performed to obtain the combustion characteristics and the emission characteristics of gas pollutants. The results are compared with those obtained in the same size single-stage fluidized bed incinerator. Due to the swirling flow in the freeboard of upper stage, the combustible contents of the ash in the outflow streams are lower and freeboard temperature of the upper stage is higher than those of the single-stage fluidized bed incinerator. As a result, the combustion efficiency of the two-stage swirl-flow fluidized bed incinerator is higher than that of the single-stage fluidized bed incinerator under the same operating conditions. The range of NO_χ emission is as low as 13.9-20.4 ppm, however, the emission of SO₂ becomes as high as 1678-1931 ppm, which need to be controled to meet the emission standards.