Abstract
DB Riley Inc., Worcester, MA, is developing a low emission boiler system (LEBS) supercritical boiler that integrates advanced low nitrogen oxide coal burners with furnace air staging and coal reburning, and with a proven U-fired slagging furnace configuration. In pilot-scale tests, the new boiler reduced NOx emission to less than 0.2 pound per million Btu on some American coals compared to 0.8 to 1.2 pounds per million Btu from conventional burners. For the US Department of Energy (DOE) LEBS project, DB Riley drew on the related experiences of the advisory board it formed of major utilities, state energy and economic agencies, and research organizations. The DB Riley engineers set a NOx emission limit of 0.2 pound per million Btu for the firing system alone to minimize the amount of NOx to be treated by the post combustion emissions control system. The U-fired design provides sufficient resident time for reburning to effectively reduce NOx.
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