use rotary dryer to dry silica sand. which fuel cost is lower if we adopt nature gas or heavy oil (have mode?

Question

Do somebody have any mode to count the fuel cost?

Answer 1

Oil is more efficient than natural gas by about 4%, due to having a higher flame temperature. So the fuel cost is lower for oil than for natural gas, because oil and gas have very close (and generally fluctuating) costs per gallon.