Effect of SO2Emission Requirements on Fluidized-bed Combustion Systems:Preliminary Technical/Economic Assessment.

摘要

The report gives results of a preliminary technical/economic evaluation to project the impact of SO2control requirements (up to 90% control) on the capital and energy costs of atmospheric-pressure and pressurized fluidized-bed combustion (AFBC and PFBC) power plants. Ability of AFBC and PFBC to reduce emissions of particulates and NOx is also considered. Performance and economic projections are presented,both for the current New Source Performance Standards and for more stringent controls;the AFBC and PFBC projections are compared with equivalent projections for conventional boilers with flue gas desulfurization. The projections show that AFBC and PFBC plants can achieve SO2control up to at least 90%,and still remain economically competitive with conventional boilers using scrubbers. However,FBC plant design and operating parameters are critical to the achievement of high levels of SO2control at competitive energy costs. In particular,increased gas residence time in the bed,and reduced sorbent particle size,are important in effective attainment of high levels of SO2control. The projections of FBC performance at 90% SO2removal must be confirmed experimentally on FBC units large enough to be representative of commercial-scale combustors.