Abstract
The Clean Air Act Amendments (CAAA) of 1990 are expected to impact both conventional and advanced power systems. Pressurized fluidized-bed combustion (PFBC) and other coal combined-cycle processes combined with high-temperature cleanup devices are environmentally friendly and economically attractive. Though PFBCs are beneficial because they can decrease the emission of sulfur and NO{sub x} species, and advanced combined-cycle systems that incorporate high-temperature cleanup devices are beneficial because they can enhance efficiency, the impact of these technologies on the emission of trace metals and certain organic compounds needs to be assessed. This paper compares (1) the Tidd PFBC demonstration plant with conventional pulverized coal- and cyclone-fired systems and (2) the Tidd plant advanced particulate filter with the performance of conventional electrostatic precipitators and baghouses. We also attempt to extrapolate the comparison to other advanced systems. Except for mercury, the PFBC at Tidd released less trace metals into the flue gas stream than the adjacent conventional pulverized-coal combustor, using the same coal. Similar to conventional power systems, hazardous air pollution emissions from advanced systems appear to be lower than the trigger level of 1990 CAAA, which requires maximum achievable control technologies.
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