The combustion air pre-heater (APH) in any boiler or process heater system is a critical operational component of the overall steam and power system, but one that is often under-maintained and often over-looked with regard to improving boiler performance. Regardless if the boiler is a solid, liquid, or gaseous fuel boiler, or even a pulp mill recovery boiler, combustion air pre-heater and combustion zone temperature directly correlate to boiler efficiencv and the generation of CO as well as PM emissions with only a minimal potential increase in NOx. This multi-year study presents the data, analysis, and facts to support the idea that every 15-20° F improvement in pre-heater temperature can and does correspond to a 2% to 2.5% improvement in boiler efficiency along with a larger corresponding decrease in boiler air emissions. This is an issue relevant for those facilities looking for positive, cost effective, and innovative solutions to Boiler MACT and NOx RACT compliance.
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