The cost of generation of steam using solid fuel fired boilers today is greater than an oil fired boiler 10yrs ago. Energy conservation is the only avenue to reduce fuel bills.
It is often perceived that steam generation through a cheaper source of fuel like solid fuel eliminates the need for energy conservation.
While steam generation via solid fuels is cheaper as compared to oil, the potential for energy conservation still exists and needs to be addressed. The rising fuel prices have brought the cost of steam generation via solid fuels equal to the cost of generation via oil 10 yrs back.
Energy conservation is the only avenue to reduce fuel bills. Reducing the fuel bill directs improves the bottom line leading to increased profits.
The cost of steam generation is calculated as:
=(Energy Added) x Fuel Price
GCV of fuel x Boiler Efficiency
Energy Added = Total energy in steam at generation pressure – Feedwater temp.
Assuming boiler efficiency of 80%, the total energy in steam as 660kcal/kg and feedwater temperature of 100 degC.
The cost of steam generation via an FO fired boiler in 2004 and coal fired boiler in 2010 are Rs. 806/ton and Rs. 816 respectively!