Statisticality of Emissions From a Recovery Boiler, 2010 TAPPI/PAPTAC International Chemical Recovery Conference

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The aim of this study is to examine the emissions from a recovery boiler. The recovery boiler is largest source of air emissions in a pulp mill. In this study, the data used is emission from the stack of a large pulp mill in eastern Finland. The studied pulp mill emission data is from more than a calendar year 2007 -2008 and was recorded as hourly averages.

The scope of the study was to: analyze of the data by using different time point views; study the emissions by the load and other operating factors of the recovery boiler; study whether regulation by maximum concentration (ppm) equals to regulation by maximum emission as weight flow per time unit and study the instability periods in the behavior of the emissions.

It has been discovered that the time point of view is of key importance. It is common to see the measurement of emission with some irregularities, such as some short term peaks with no apparent reason. Often these peaks can be locally observed. Mostly the pulp mill emission regulations are based on yearly or monthly averages instead of hourly data.