1989 Volume 15 Issue 2 Pages 238-245
To investigate the drainage of a bed which was packed with coal agglomerates obtained by oil agglomeration, dewatering experiments were carried out by using gravitational and air blow drainage under various conditions. The drainage characteristics of the bed are discussed on the basis of agglomerate size and other factors concerned with drainage phenomena.
In gravitational drainage, the time required to reach equilibrium was dependent on the size of agglomerates and it increased rapidly at less than a certain agglomerate size. The moisture content of the bed decreased with increasing size of the agglomerates. The values of the minimum moisture content after gravitational drainage and after air blow drainage were about 15 % and 10 % respectively. It could be estimated on the basis of a few assumptions that the weight ratio of the water in each agglomerate to the total water in the bed increased with decreasing size of the agglomerates.
