Now, two methods are planned for hydraulic transportation of coal. One is to pass the coal through a pump and the other is to feed the coal into the delivery pipe of the pump.
We studied, concerned with the former method, on the variation of characteristics of pump under varying size of coal up to 15mm and concentration up to about 35% in weight percentage. A 3-in sand pump was used for these experiments.
When the concentration of coal increases, the pump head and efficiency decrease and the brake horse power increases. In the case of constant concentration and quantity of discharge, the larger the size of coal, the lower the pump head and efficiency and the greater the brake horse power. When the size of coal is large, slight increase of concentration brings on eminent decrease In pump efficiency.
In this paper the results on the degradation of coal at the hydraulic transportation are also described.
