In a boiler with sootblowers, among all the variables that control the efficiency how we can find out the role of soot blowers in efficiency as percentage? (The steam consumption by sootblowers is unknown)
Answers
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09/08/2010
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Alan Goelzer, Jacobs Consultancy, alan.goelzer@jacobs.com
The purpose of the sootblowers is to maintain target overall thermal efficiency---as determined by:
# Excess air
# Flue gas entry temperature into stack minus ambient air temperature
# Energy conservation services, e.g. economizer
# For steam boiler, boiler feed water reheat
# Heat losses
Typically, the soot blowers are only operated for short time periods each stream day or calendar day, so debit to overall thermal efficiency is modest.
Power cycle efficiency, i.e kilowatts-hours(e) net to grid divided by million kilocalories per hour fuels combusted HHV is more impacted by superheating and extraction and re-superheating and condensing heat sink type / working temperature than by relatively modest kgs per day steam used in soot blowers.
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09/08/2010
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Ralph Ragsdale, Ragsdale Refining Courses, ralph.ragsdale@att.net
I have no historical data. However, if this is an existing operating unit, one can collect data and make calculations over several periods between blowing, and arrive at the efficiency range for your operation.
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