Waste heat or cogeneration boilers are designed for the recovery of waste energy by obtaining steam, hot oil, hot or boiling water from the hot gas produced as a result of the process and discharged from the process or stack.
Gas turbines, mining kilns, cement kilns, paper mills, etc. produces that type of energy that the plant needs. Placing a waste heat recovery boiler system behind these utilities with high temperature gas output produces extra energy input.