Effect of Coal Type and Residence Time on the Submicron Aerosol Distribution from Pulverized Coal Combustion

Three types of pulverized coal were burned in a laboratory furnace under various combustion configurations. Pulverized samples of Utah bituminous, Beulah (North Dakota) lignite, and Texas lignite coals were burned at a rate of 2.5 kg/hr in a laboratory furnace. Aerosol size distributions were measured at various positions within the convection section, and temperature and gas compositions were measured throughout. The evolution of the submicron particle size distribution within the convection section for the three coals was similar, although the location of the initial particle mode at the convection section inlet varied with coal type. While staged combustion of Utah bituminous coal had a variable effect on the volume of submicron aerosol produced, staged combustion of the lignites caused a definite increase in the submicron aerosol volume. Vapor enhancement due to a localized reducing atmosphere, which would effect coals of higher ash volatility, is thought to explain this behavior.

[1]  Richard D. Smith,et al.  Volatility of fly ash and coal , 1980 .

[2]  Terry Wall,et al.  Mineral matter in coal and the thermal performance of large boilers , 1979 .

[3]  R. Bryers,et al.  Ash deposits and corrosion due to impurities in combustion gases , 1978 .

[4]  Adel F. Sarofim,et al.  Factors governing the surface enrichment of fly ash in volatile trace species , 1982 .

[5]  Richard C. Flagan,et al.  The Influence of Combustor Operation on Fine Particles from Coal Combustion , 1981 .

[6]  G. Gordon,et al.  Composition and size distribution of in-stack particulate material at a coal-fired power plant , 1976 .

[7]  R. J. Quann,et al.  Mineral matter and trace-element vaporization in a laboratory-pulverized coal combustion system. , 1982, Environmental science & technology.

[8]  Adel F. Sarofim,et al.  The Physical Transformation of the Mineral Matter in Pulverized Coal Under Simulated Combustion Conditions , 1977 .

[9]  W. John,et al.  A cyclone for size-selective sampling of ambient air , 1980 .

[10]  R. Flagan,et al.  Laboratory studies of submicron particles from coal combustion , 1981 .

[11]  David W. Pershing,et al.  Pulverized coal combustion: The influence of flame temperature and coal composition on thermal and fuel NOx , 1976 .

[12]  Kirk K. Nielson,et al.  Concentration dependence upon particle size of volatilized elements in fly ash , 1979 .

[13]  J. Ondov,et al.  Application of surface-deposition models to size-fractionated coal fly ash , 1980 .

[14]  M. Nettleton.  Particulate formation in power station boiler furnaces , 1979 .

[15]  D. Ensor,et al.  Coal Combustion Aerosol Formation Mechanisms: A Review , 1981 .

[16]  D. Shaw,et al.  Recent developments in aerosol science , 1978 .

[17]  E. A. Sondreal,et al.  Ash Fouling in the Combustion of Low Rank Western U.S. Coals , 1977 .

[18]  R. J. Quann,et al.  Vaporization and condensation of mineral matter during pulverized coal combustion , 1981 .

[19]  D. W. Pershing,et al.  Pulverized coal combustion: NOx formation mechanisms under fuel rich and staged combustion conditions , 1979 .

[20]  D. W. Pershing,et al.  Physical Mechanisms Governing the Oxidation of Volatile Fuel Nitrogen in Pulverized Coal Flames , 1977 .

[21]  J. Ondov,et al.  Elemental particle-size emissions from coal-fired power plants: Use of an inertial cascade impactor , 1978 .

[22]  R. J. Quann,et al.  Vaporization of refractory oxides during pulverized coal combustion , 1982 .

[23]  R. L. Davison,et al.  Trace elements in fly ash: dependence of concentration on particle size , 1974 .

[24]  F. J. Anscombe,et al.  Rejection of Outliers , 1960 .

[25]  J. M. Allen,et al.  Size distribution of fine particulate emissions from a coal-fired power plant , 1976 .