About drying process Drying process can be divided into 3 steps briefly.It starts with “drying and preheating period” and moves to “constant rate period”, then “falling rate period” follows them. First of all, what is “drying and preheating period”? It suggests a period that drying rate is low while the substance itself is being heated … Continue reading About drying process / Sludge dryer, Slurry dryer