Abstract
Combustion tests of fuel oil blends derived from the Exxon Donor Solvent (EDS) process were carried out in a laboratory 50 hp test boiler and a commercial 1425 hp boiler. All tests showed that coal derived fuel oils burn cleanly compared to petroleum fuels with low levels of smoke and particulates. Emissions of NOx were related to fuel nitrogen content for both the petroleum and coal-derived fuels. Polynuclear aromatic hydrocarbon (PNA) emissions were higher for EDS fuels in lab scale tests. These emissions appeared to be due to the pyrolysis of high molecular weight PNA into smaller ring structures. Tests in the commercial boiler showed no significant differences in PNA emissions from EDS fuel oil and petroleum regular sulfur fuel oil. It is speculated that increasing the boiler size decreases the surface-to-volume ratio which provides a smaller quench zone for partially pyrolyzed combustion products. Emissions of PNA from the commercial scale combustion of coal-derived fuels may not be a problem.
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