National Dioxin Study Tier 4 - Combustion Sources: Final Test Report - Site 77, Wood Fired Boiler WFB-A

摘要

The report summarizes the results of a dioxin/furan emissions test of a wood-fired boiler equipped with a fabric filter system for particulate emissions control. The boiler combusts a combination of bark, hogged wood, sawdust, and green and dry planar shavings. The test is the seventh in a series of emission tests conducted under Tier 4 of the National Dioxin Study. The primary objective of tier 4 is to determine if various combustion devices are sources of dioxin and/or furan emissions. If any of the combustion sources are found to emit dioxin or furan, the secondary objective of Tier 4 is to quantify these emissions. Wood-fired boilers are one of eight combustion device categories that have been tested in the Tier 4 program. The tested boiler, hereafter referred to as Boiler WFB-A, was selected for this test after an initial information screening and a 1-day pretest survey. The logs which are processed at the plant are stored in a salt water body adjacent to the plant. Thus, the feed to Boiler WFB-A has a higher inorganic chloride content than the feed to most wood-fired boilers. Boiler WFB-A is considered representative of those wood-fired boilers in the United States firing salt-laden wood. Data presented in the report include dioxin (tetra through octa homologue +2378 TCDD) and furan (tetra through octa homologue +2378 TCDF) results for both stack samples and ash samples. In addition, process data collected during sampling are also presented.