ABSTRACT
The lower end of the range up to ∼400 tph is employed for its process steam, captive power, and cogeneration (cogen) needs. Beyond 400 tph, where reheating of steam becomes viable, boilers are mainly used for utility application. This dividing line is thin and tentative, and exceptions are found on both sides of this arbitrary demarcation. With cogen on the rise and very large plants gaining popularity, what a utility boiler was in the past has become an industrial unit today and this progression is only going to continue.
