Abstract
The heating plant at Nova Scotia Hospital is fired with No. 4 residual fuel oil and has experienced a persistent problem of soot emissions. Early in 1991, the Combustion and Carbonization Laboratory (CCRL) of CANMET's Energy Research Laboratories was contracted to conduct an investigation of possible causes and corrective measures. It was found that the automatic combustion controls on the boilers were inadequate to cope with the rapid fluctuations in steam demand. Frequently, on increasing load, the fuel controller would respond more rapidly than the air controller, resulting in substoichiometric combustion and heavy smoke emissions. Numerous measures were implemented to improve combustion control and burner performance, including installation and calibration of new electronic control systems with parallel demand systems for fuel and air. Boiler efficiency was measured over the working load range, and is reported. In addition, gaseous emissions of CO, NOx , and SO2 were measured, and these are discussed in light of a proposed emission standard for industrial boilers, that is expected to take effect in 1994.
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