OPERATING EXPERIENCE OF A COAL-FIRED BOILER RETROFIT WITH AN ADVANCED HYBRID OF COAL GASIFICATION FOR SO_2 NO_X EMISSIONS CONTROL AND REDUCED OPERATING COST

摘要

Results are presented from the first commercial operation of a coal-fired boiler retrofit with an advanced hybrid of coal-gasification for SO_2 (sulfur dioxide) and NO_x (nitrogen oxides) emissions compliance. Significant operating cost savings were demonstrated by firing a lower-cost, higher-sulfur Illinois bituminous coal in lieu of expensive compliance coals. As this is an emissions control project, the construction permit waived NSPS (new source performance standards) and PSD (prevention of significant deterioration) and no NSR (new source review). The Clean Combustion System (CCS) is a simple air-blown entrained-flow coal-gasifier that replaces boilers existing burners. Final combustion of the gasified coal is completed in the boiler furnace with OFA. Limestone is the only “chemical” required to control emissions of SO_2 and NO_x. This report addresses: 1)CCS Technology Description and the Coal-Fired Boiler Retrofit 2)Discussion of the Equipment 3)Operation Observations and Lessons Learned 4)Preliminary Operations Summary - SO_2 and NO_x Emissions Control - Improved Boiler Efficiency - Reduction of CO_2 emissions.