Abstract
A pressurized thermogravimetric (TG) analysis system was used to study the isothermal reaction of sulfur dioxide with limestone and dolomite at 1 and 10 atm pressure, and temperatures from 750 to 1050°C. Sorbents of 44–4000 μm particle size were sulfated in gases simulating a 10–300% excess air level in a coal combustion atmosphere. The TG rate data were used to predict the desulfurization performance of limestone and dolomite sorbents in atmospheric and pressurized fluidized-bed combustion systems. The projections are compared to available pilot plant data (i.e., the pressurized Exxon miniplant), and their limitations are discussed.
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