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COST OF SELECTIVE CATALYTIC REDUCTION (SCR) APPLICATION FOR NOX CONTROL ON COAL-FIRED BOILERS
Citation:
Jozewicz, W. COST OF SELECTIVE CATALYTIC REDUCTION (SCR) APPLICATION FOR NOX CONTROL ON COAL-FIRED BOILERS. 2002.
Description:
The report provides a methodology for estimating budgetary costs associ-ated with retrofit applications of selec-tive catalytic reduction (SCR) technology on coal-fired boilers. SCR is a post-combustion nitrogen oxides (NOX) con-trol technology capable of providing NOX reductions >90%. With SCR, NOX reduc-tions are achieved by injecting ammo-nia into the flue gas, which then passes through layers of catalyst in a reactor. The ammonia and NOX react on the sur-face of the catalyst, forming nitrogen and water. In the U.S., SCR has been applied mainly to electrical utility boil-ers firing coal and natural gas and rang-ing in capacity from 25 to 800 MW.
The costing methodology presented in the report is applicable to SCR retro-fits on coal-fired boilers ranging in ca-pacity from 100 to about 850 MW and with design efficiencies of 80-95% NOX removal. The cost equations and vari-ables used in the methodology are based on information obtained from SCR system suppliers and reflect ex-perience gained from >200 SCR appli-cations. Note, however, that the budgetary cost estimates for typical SCR applications that this methodology provides cannot replace the detailed site-specific engineering cost studies or cost quotations that are developed by SCR system suppliers.