ABSTRACT
One of the most feasible methods of conserving energy in a steam generator is the application of heat recovery equipment. This can be accomplished by the utilization of the combustion flue gases to increase the incoming feedwater temperature or, if needed, increase the combustion air temperature. The most frequently used method on packaged boilers is the economizer that increases the feedwater temperature. This is preferred because the capital investment is less than that of an air preheater; there is lower draft loss, thus lower fan horsepower required; and, finally, reduced furnace heat absorption. See Figure 9.1 on boiler house recoverable losses.
