Effects of Particle Distributions on Combustion Characteristics under Different Coal Blending Patterns

doi:10.11930/j.issn.1004-9649.2013.6.22.4

Abstract

Abstract: There are two blending patterns of different coals, i.e., mixing before grinding and mixing after grinding in power plants. To study the effects of the blending pattern on the distribution of coal particles and the combustion characteristics, experiments and analysis on four kinds of coal grinded under the same conditions(including the Longping anthracite, the Wanliu bituminous coal and the two coals blended with the two blending styles) were conducted by the Easysizer 20 laser particle size analyzer and the thermogracimetric analyzer respectively. The experimental results show that the particle size and the combustion characteristics of the coal sample blended before grinding are similar to that of the Wanliu bituminous coal which is composed of much more portion of small particles, while the particle size and the combustion characters of the coal blended after pulverization is close to the Longping anthracite which consists of much more large particles. The coal blended before grinding outperforms those blended after grinding in the aspects of the ignition index, combustion stability, burn-out characteristics and comprehensive combustion characteristics.

Key words: thermal power plant, coal blending, mixing before grinding, mixing after grinding, particle size distribution, thermogravimetric analysis, combustion characteristic

CLC Number:

TK16

LIU Liang, YANG Zhe, ZHOU Zi-qi, LI Hong-ming, CHEN Ming-hui. Effects of Particle Distributions on Combustion Characteristics under Different Coal Blending Patterns[J]. Electric Power, 2013, 46(6): 22-26.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2013.6.22.4

https://www.electricpower.com.cn/EN/Y2013/V46/I6/22

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