Compressed Air Best Practices - February 2009 - (Page 17) Focus Industry POWER PLANTS | 02/09 | Long Retractable Lance Cleaning Pattern Retracting Extending Long retractable lances vary in length with the boiler size and are one-half the width of the boiler. Cooling is very critical with these lances since they may operate in temperature zones up to 2,000 °F and are cantilevered out from the side of the boiler walls. “The loss of. a lance will reduce boiler efficiency and eventually will lead to a plant shutdown.” Air Heaters The long retractable blowers are often also used in the air heater section. Sometimes a “swing arm” type blower may be used in the air heater section. This will use a lower magnitude of compressed air but will generally require a longer cycle. System Interlocks Several safety interlocks can be provided on soot blowing systems. One or more of the interlocks listed below may be used: p p p Main manifold system air pressure Air pressure interlock at individual lances Air flow to lances These safety interlocks are used to prevent damage due to low air pressure or flow to the lances, especially the long retractable lances while they are operating in the boiler. The loss of a lance will reduce boiler efficiency and eventually will lead to a plant shutdown. For more information, please contact Hank Van Ormer: tel: 740-862-4112, email: hankvanormer@aol.com, www.airpowerusainc.com www.airbestpractices.com 17 http://www.airpowerusainc.com http://www.airbestpractices.com
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