망사 충전 고정층 반응기의 특성-농도 분포-

김봉현; 박권필; 임종성; 전해수

HWAHAK KONGHAK, Vol.30, No.2, 165-171, April, 1992

Export Citation

망사 충전 고정층 반응기의 특성-농도 분포-

Characteristics of a Screen-Packed Fixed Bed-Concentration Distribution-

김봉현, 박권필, 임종성, 전해수

초록

망사 충전물을 삽입한 촉매고정층 반응기에서 농도분포에 대하여 연구하였다. 에탄올 탈수 반응이 일어나는 활성알루미나 입자고정층 및 망사 충전물을 삽입한 고정층을 설치하여 유속분포가 다른 조건하에서 농도분포를 측정하였다. 기벽 인접 영역에서의 공극율의 불균일로 인해 유체유속분포와 농도분포가 불균일하지만 고정층에 망사 충전물을 삽입함으로 인해 농도분포를 균일하게 할 수 있었다. 공극율 및 망사 충전물의 삽입효과를 고려한 고정층 내 운동량 및 물질전달 지배방정식의 수치해로 구한 에탄올 출구농도는 에탄올 검류관으로 측정한 실험치와 비스한 값을 보였다.

The concentration distribution in a catalytic packed bed with packing was studied. The resistance to flow in the bed, packed with activated alumina particles to catalyze ethanol degydration reaction, varied by inserting sereen-packing and different size particle section. It was found that the velocity-and concentra-tion-profiles were non-uniform due to the variation of void fraction near the wall. The effect of inserting the screen-packing in the bed enabled velocity-and concentration-profiles to be uniformly distributed over the bed. the governing equations for momentum-and mass-transport in the fixed be and the fixed bed containing a screen-packing were numercasslly solved to demonstrate the effects of the void fraction and the screen-packing inseted in the bed. Effluent ethanol concentrations, measured by ethanol detector tube, were found to be varied with radial position in a manner consistent with the modeling equations.

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[1] Chen DH, Jain SC, Can. J. Chem. Eng., 58, 281 (1980)

[2] Chhabra RP, Richardson JF, Chem. Eng. Sci., 40(2), 313 (1985)

[3] Claus G, Vergnes F, Goff PL, Can. J. Chem. Eng., 54, 143 (1976)

[4] Benenati RF, Brosilow CB, AIChE J., 8, 359 (1962)

[5] Cohen Y, Metzner AB, AIChE J., 27, 705 (1980)

[6] Haughey DF, Beveridge GSG, Chem. Eng. Sci., 21, 905 (1966)

[7] Hirata Y, Ito J, J. Chem. Eng. Jpn., 14(4), 277 (1981)

[8] Kim SH, M.S. Dissertation, Korea Univ., Seoul, Korea (1985)

[9] Cloudhary M, Szekely J, Weller SW, AIChE J., 22(6), 1027 (1976)

[10] Kim BH, Chun HS, HWAHAK KONGHAK, 25(5), 528 (1987)

[11] Winter O, Eng MT, Hydrocarb. Process., 55(11), 125 (1976)

[12] Brandt DE, Oil Gas J., 5, 51 (1979)

[13] Butt JB, Bliss H, Walker CA, AIChE J., 8(1), 42 (1962)