RESIDUAL CARBON FROM PULVERIZED-COAL-FIRED BOILERS .2. MORPHOLOGY AND PHYSICOCHEMICAL PROPERTIES

被引:98
作者
HURT, RH
DAVIS, KA
YANG, NYC
HEADLEY, TJ
MITCHELL, GD
机构
[1] SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551
[2] PENN STATE UNIV,COAL & ORGAN PETROL LABS,UNIVERSITY PK,PA 16802
关键词
PULVERIZED COAL COMBUSTION; UNBURNT CARBON; PHYSIOCHEMICAL PROPERTIES;
D O I
10.1016/0016-2361(95)00100-J
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
The morphology and bulk physicochemical properties of residual carbon in eight fly ash samples from commercial power plants were investigated. Enriched carbon samples extracted from the bulk fly ash were characterized by high-depth-of-field optical microscopy, reflected-light microscopy, scanning electron microscopy, elemental analysis (C, H, O), and CO2 adsorption. The crystalline structure of the carbon was characterized by X-ray diffraction, optical reflectance, and high-resolution transmission electron microscopy fringe imaging. The results were compared with measurements on laboratory-generated chars in the early-to-intermediate stages of combustion. Compared with those chars, the residual carbon is of similar elemental composition, petrographic composition and surface area but higher crystallinity. The fuel-related mechanisms that can contribute to carbon carryover in boilers are discussed, including inertinite persistence, mineral matter encapsulation and char deactivation by pregraphitization, as well as the implications for utilization of residual carbon.
引用
收藏
页码:1297 / 1306
页数:10
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