本文从颗粒破碎的角度,建立了燃烧过程中单颗煤焦的逾渗破碎及其成灰模型,并深入研究了初始大孔隙率对颗粒破碎程度以及残灰粒径分布的重要影响.模拟结果再现了无大孔存在(φ=0)情况下,单颗煤焦生成单颗残灰的实验事实;研究结果还表明,在所考察的取值范围内,初始大孔隙率φ越大,煤焦颗粒破碎越剧烈,燃烧前期的破碎程度也随之升高,同时,φ越大,燃烧过程中单颗煤焦生成残灰的数目越多,平均粒径越小,而且残灰主要集中在粒径较小的范围内.
参考文献
| [1] | Ensor D S;Cowen S;Hooper R et al.Evaluation of the George Neal No.3 Electrostatic Precipitator[R].Final Report EPRI,1979. |
| [2] | Schmidt E W;Gieseke J A;Allen J M .Size Distribution of Fine Particulate Emissions from a Coal-Fired Power Plant[J].Atmospheric Environment,1976,10(12):1065-1069. |
| [3] | Neville M;Quann R J;Haynes B S et al.Vaporization and Condensation of Mineral Matter During Pulverized coal Combustion.Eighteenth Symposium (International)on Combustion[Z].The Combustion Institute Pittsburgh,1981. |
| [4] | McElroy M W;Carr R C;Ensor D S et al.Size Distribution of Fine Particles from Coal Combustion[J].Science,1982,215(4528):13-19. |
| [5] | McCain J C;Gooch J P;Smith W B .Results of Field Measurements of Industrial Particulate sources and Electrostatic Precipitator performance[J].Journal of the Air Pollution Control Association,1975,25(02):117-121. |
| [6] | Helble J J .Mechanisms of Ash Formation and Growth During Pulverized Coal Combustion[D].Department of Chemical Engineering M I T,1987. |
| [7] | Helble J J;Sarofim A F .Influence of Char Fragmentation on Ash Particle Size Distribution[J].Combustion and Flame,1989,76(02):183-196. |
| [8] | Kang S G .Fundamental Studies of Mineral Matter Transformation During Pulverized Coal Combustion: Residual Ash Formation[D].Dept of Chemical Engineering MIT USA,1991. |
| [9] | Quann R J .Ash Vaporization Under Simulated pulverized Coal Combustion Conditions[D].Department of Chemical Engineering M I T,1982. |
| [10] | Ramsden A R .A Microscopic Investigation into the Formation of Fly-Ash During the Combustion of a Pulverized Bituminous Coal[J].Fuel,1969,48(02):121-137. |
| [11] | Quann R J;Sarofim A F .A Scanning Electron Microscopy Study of the Transformations of Organically Bound Metals During Lignite Combustion[J].Fuel,1986,65(01):40-46. |
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