A waste heat boiler can be called a large heater. A general boiler has a pot (steam and water system) and a furnace (combustion system), while a waste heat boiler does not have a furnace. The heat source of a waste heat boiler generally relies on high-temperature exhaust from a gas turbine. gas or other heat source. Waste heat boilers are divided into vertical and horizontal types, as well as single-pressure and three-pressure (three-pressure means there are three steam drums, corresponding to three sets of steam and water systems). The English name of the waste heat boiler is HRSG, which is the abbreviation of Heat Recovery Steam Generator. , literally translated into Chinese as heat recovery steam generator.