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不同粒度煤粉的表面结构与燃烧特性研究
引用本文:徐远纲,张成,夏季,陈刚.不同粒度煤粉的表面结构与燃烧特性研究[J].热能动力工程,2010,25(1).
作者姓名:徐远纲  张成  夏季  陈刚
作者单位:华中科技大学,煤燃烧国家重点实验室,湖北,武汉,430074
基金项目:国家自然科学基金资助项目,广东省科技厅重大科技专项基金资助项目 
摘    要:制备了4种不同粒度的平三煤和大友煤煤粉,分别采用低温饱和氮气吸附的方法和热天平研究了煤粉的表面结构特性和煤粉的燃烧特性。实验结果表明:随着煤粉粒度的减小,煤粉的孔隙结构发生变化,比表面积和孔容积均增大,表面结构复杂,致使分形维数增大,有利于煤粉颗粒的燃烧,因此,平三煤的着火温度降低了14℃,表观活化能均降低了12.3kJ/mol,燃尽率提高了9.81%,大友煤的燃烧特性变化规律相似。此外,煤粉颗粒的分形维数还能在一定程度上表述煤粉的燃烧特性,因此,分形维数可为煤粉燃烧特性的评价提供一种新的途径。

关 键 词:煤粉  粒度  表面结构  分形维数  燃烧特性

Study of the Surface Structure and Combustion Characteristics of Pulverized Coal in Various Particle Sizes
XU Yuan-gang,ZHANG Cheng,XIA Ji,et al.Study of the Surface Structure and Combustion Characteristics of Pulverized Coal in Various Particle Sizes[J].Journal of Engineering for Thermal Energy and Power,2010,25(1).
Authors:XU Yuan-gang  ZHANG Cheng  XIA Ji  
Affiliation:XU Yuan-gang,ZHANG Cheng,XIA Ji,et al (National Key Laboratory on Coal Combustion,Central China University of Science , Technology,Wuhan,China,Post Code: 430074)
Abstract:Four particle sizes of Pingsan-originated and Dayou-originated coal were prepared. The surface structure and combustion characteristics of the pulverized coal in different particle sizes were investigated by using respectively the low-temperature saturated nitrogen adsorption method and a thermobalance. The test results indicate that with a decrease of the particle size of the pulverized coal,a change will occur to the pore structure of the pulverized coal. Both the specific surface area and pore volume wil...
Keywords:pulverized coal  particle size  surface structure  fractal dimension  combustion characteristics
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