HWAHAK KONGHAK, Vol.19, No.4, 291-302, August, 1981
원환유동층에서의 기체혼합특성
Gas Mixing in an Annular Fluidized Bed
초록
Annular형태의 유동층에서 기체의 축 방향 혼합계수와 측면방향（lateral） 혼합계수를 구하였다. Annular단면에서 기체유속, 입자크기 및 유동화입자의 유동화조건이 다른 입자의 첨가가 기체의 혼합에 미치는 영향을 결정하였다.
측면 방향혼합계수의 산출은 diffusion type model을 제안하여 적용하였으며 축 방향혼합에서는 Schügerl의 Model을 사용하였다. 측면방향 기체혼합계수와 축 방향혼합계수 모두 기체의 유속이 증가함에 따라 지수함수적으로 증가하였고 입자크기의 증가에 따라 측면방향 혼합은 감소하며 기체 유속의 영향은 축 방향혼합계수가 측면방향보다 크게 나타났다.
이들 기체혼합계수는 본 실험의 조건에서 입자크기와 기체유속의 함수로서 잘 표현되었다.
측면 방향혼합계수의 산출은 diffusion type model을 제안하여 적용하였으며 축 방향혼합에서는 Schügerl의 Model을 사용하였다. 측면방향 기체혼합계수와 축 방향혼합계수 모두 기체의 유속이 증가함에 따라 지수함수적으로 증가하였고 입자크기의 증가에 따라 측면방향 혼합은 감소하며 기체 유속의 영향은 축 방향혼합계수가 측면방향보다 크게 나타났다.
이들 기체혼합계수는 본 실험의 조건에서 입자크기와 기체유속의 함수로서 잘 표현되었다.
Lateral and axial gas phase mixing have been measured in the annular section of an annular fluidized bed which was constructed from two pieces of 7.6 ㎝-d야 mether plexiglass cylinder.
Effects of gas velocity, particle size and weight percent of added inert particles on gas phase mixing have determined. For lateral mixing, a diffusion type model was proposed to analyze the present system and Schugerl model H was employed to calculate the axial gas mixing coefficients.
Both gas mixing coefficients increased exponentially with gas flow rate. Lateral gas mixing decreased with particle size. The addition of inert particles increased lateral gas mixing however, the reverse trend was observed for axial gas mixing with the addition of inert particles.
Axial and lateral gas mixing coefficiets were correlated in terms of gas flow rate and particle size in an annular fluidized bed.
Effects of gas velocity, particle size and weight percent of added inert particles on gas phase mixing have determined. For lateral mixing, a diffusion type model was proposed to analyze the present system and Schugerl model H was employed to calculate the axial gas mixing coefficients.
Both gas mixing coefficients increased exponentially with gas flow rate. Lateral gas mixing decreased with particle size. The addition of inert particles increased lateral gas mixing however, the reverse trend was observed for axial gas mixing with the addition of inert particles.
Axial and lateral gas mixing coefficiets were correlated in terms of gas flow rate and particle size in an annular fluidized bed.