How Much Steam Produced Form 5 ton Boiler

You may check the following design formulas:

Example: Coal heat value:5000Kcal/KG, Boiler effiency 80%, one ton steam heat enthalpy: 600000Kcal

Then the steam out put is 5000Kcal/Kg*1000*80%/600000Kcal=6.67 ton, this is the steam quanity which one ton coal can produce.

SO 5 ton coal fired boiler could produce 6.67*5=33.33 ton steam.