The concept is simple. You heat water with fuel
gas. Then you use this heat elsewhere. But what about the heat that doesn't
get transferred to the water....the heat that escapes in the boiler's flue gas. Some
people, especially those new to industry, forget about this valuable heat. Going a
step further in heat integration shows how to effectively pre-heat the water entering the
boiler by using the flue gas in a boiler economizer.
The temperatures are of course dependent on flowrates,
equipment size, heat transfer coefficients, and pressure. Using an economizer setup
such as this can drastically reduce the amount of fuel gas used in the boiler. Also
note that finned tubes can help compensate for the poor heat transfer on the flue gas side
of the economizer.
FOR MORE INFORMATION ON BOILER ECONOMIZERS, CHECK OUT WWW.BOILERROOM.COM
