SUCCESSFUL IMPLEMENTATION OF MULTI-STAGE GAS EMISSIONS REDUCTIONS AT 1050MWe COLESON COVE GENERATING STATION USINGREBURN, WFGD, AND WESP TECHNOLOGIES

摘要

New Brunswick Power (NB Power) is the largest electric utility in Atlantic Canada with agenerating capacity of more than 4000MWe consisting of nuclear, thermal, and hydro. Amongthe generation portfolio, Coleson Cove station with its 1050MWe generating capacity is NBPower’s largest generation facility. In 2002, NB Power embarked on a multi-facet emissionsreduction and plant improvement program:1. to reduce NOx emissions level by at least 70% to achieve 0.21 lb NOx/10~6Btu or better byutilizing low NOx burners with air staging and reburning technologies;2. to reduce SO_2 emissions by installing a 90% efficient wet limestone desulphurization(WFGD);3. to reduce below the visible threshold SO3 acid mists by utilizing a wet electrostaticprecipitator (WESP) integral to the WFGD tower;4. to reduce dry particulate emissions by 75% using WESP congruent with the existing dryelectrostatic precipitators; and5. to improve overall plant efficiency by renovating steam turbines with new HP/IP innercasings and rotors, complete with modern blading.This paper outlines NB Power’s emissions reduction planning strategy for the Coleson Covestation. It also describes the design and performance characteristics of the combustion systemwith oil reburning plus the WFGD, and WESP systems retrofitted at Coleson Cove generatingstation. Design features and performance achieved are included.