Atmospheric fluidized bed coal

Eig. 8. Cost of electricity (COE) comparison where represents capital charges, Hoperation and maintenance charges, and D fuel charges for the reference cycles. A, steam, light water reactor (LWR), uranium B, steam, conventional furnace, scmbber coal C, gas turbine combined cycle, semiclean hquid D, gas turbine, semiclean Hquid, and advanced cycles E, steam atmospheric fluidized bed, coal E, gas turbine (water-cooled) combined low heating value (LHV) gas G, open cycle MHD coal H, steam, pressurized fluidized bed, coal I, closed cycle helium gas turbine, atmospheric fluidized bed (AEB), coal J, metal vapor topping cycle, pressurized fluidized bed (PEB), coal K, gas turbine (water-cooled) combined, semiclean Hquid L, gas turbine... 

Valk, M. (ed.) Atmospheric Fluidized Bed Coal Combustion (Elsevier, Amsterdam, 1994). 

Patents were filed by Babcock Wilcox [21-23] concerning the so-called SOx-NOx-Rox Box process, according to which, in line with Fig. 6b, contemporary SO2 and NOx removal (the former by adsorption on lime, the latter by catalytic reduction with ammonia) is accomplished by the use of catalytic filters, prepared as described in Section III. A schematic of the catalytic baghouse assembly is presented in Fig. 7. The results of the application of such technology to the treatment of a lab-scale atmospheric fluidized-bed coal boiler (capacity 0.5 MWe) were reported in Refs. 9 and 29. The achieved abatement efficiencies were 70-80% for SO2, 90% for NOx(NH3/NO ratio = 1 ammonia slippage = 10-15%), and 99% for particulate. Since March 1992 a 5-MWe demonstration project, funded by the U.S. Department of Energy and by the Ohio Coal Development Office,... 

Atmospheric fluidized bed coal combustion (AFBC) atatempeia-ture of about 850°C with calcite as a sorbent, produces solid residue of different chemical composition from that produced at higher temperatures. The AFBC residue possesses cementing properties. It consists of anhydrite, free lime, quartz, and aluminosilicates. DTA and TG techniques have been utilized to determine melting intervals, oxidation of unbumt coal, limestone, and anhydrite. 

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