활성탄 재생의 기초 연구로서 입자의 크기, 유속, Screen-packing의 mesh size에 따른 axial dispersion coefficient의 영향을 비교 연구하였다. 유동입자는 평균직경이 0.302, 0.151, 0.097 mm인 활성탄을 사용하였으며, 충진물로는 8, 10, 12 mesh/in로 된 1 cm×1 cm의 원동형 금망충진물을 사용하였다. 금망충전 유동층에서의 축방향 고체혼합은 dispersion model이 잘 적용되었으며, axial dispersion coefficient는 평균 입자직경（d_p）, screen-packing의 mesh opening(M), 유속들과 다음과 같은 상한 관계의 실험식이 얻어졌다.
De=2.5（M）^0.9(d_p)^-0.1(U/U_mf-1)^0.9
금망충진 유동층에서의 맥류의 영향도 아울러 고찰하였으며 그 때의 결과는 보통의 충진유동층에서 보다 더 높은 dispersion coefficient를 얻을 수 있었다.

Behavior of the axial particle mixing in a screen-packed fluidized bed was studied for a basic research on the regeneration of activated carbon. Main factors chosen for the effect on the process were gas velocity, particle size and mesh opening of screen packing. The mean diameters of the fluid particle were 0.302, 0.151, and 0.097 mm and the packings were 1 cm × 1 cm open-end cylinders made of 8, 10, and 12 mesh/in stainless steel scree. A dispersion model was well fitted to the experimental data of the longitudinal particle mixing in a screen-packed fluidized bed. The axial dispersion coefficient was successfully correlated with mean particle diameter（d_p）, mesh opening(M), and gas velocity(U/U_mf-1), and the following empirical equation was obtained.
De=2.5（M）^0.9(d_p)^-0.1(U/U_mf-1)^0.9
The effects of pulse on the screen-packed fluidized bed was also studied. The results showed that the axial dispersion coefficients with pulse were higher than the normal screen-packed fluidized bed.