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 A stack
temperature gauge should be installed in the flue outlet of every boiler and
monitored regularly to ensure that the temperature is consistent with the
firing
rate, operating temperature for hot water boilers or pressure for steam boilers
and boiler design. Your boiler supplier or manufacturer should be able to
provide data to give you an indication of optimum performance. For
example, a Cleaver Brooks firetube boiler should operate with a stack
temperature no higher than approximately 75 to 100 °F above the water
temperature in a hot water boiler or saturated steam temperature in a steam
boiler at high fire.
Accumulations of soot or scale on
the heat exchange surfaces of the boiler, however, act to impede heat transfer,
thereby resulting in higher exit flue gas temperatures than normal. A
thickness of 1/32” and 1/16” of soot on the fireside heat transfer surfaces, for
example, will increase fuel costs 3% and 8%, respectively. Scale will
increase fuel costs by 4% and 9% for the same deposit thicknesses on the boiler
waterside. In addition to added fuel costs, these conditions left
unchecked will lead to premature pressure vessel failure.
If we can be of service to you in determining optimal
performance for your boiler, or you need a stack temperature gauge to monitor
your boiler’s performance, please contact or visit the website of the CBRA
Member located in your area. |
