摘要详情

ID / 提交时间

667 / 2019-04-28 12:37:13

标题

Effect of Moisture Content on Mesostructure and Mechanical Properties During Coal Block Crushing Process

关键字

coal, moisture content, uniaxial compression, mesostructure, fractal dimension

主题及专题

全体主题 > 燃料利用与化学循环技术

状态

终稿

作者

Yufei ZHANG / China-EU Institute for Clean and Renewable Energy at Huazhong University of Science and Technology

Song HU / 1.China-EU Institute for Clean and Renewable Energy at Huazhong University of Science and Technology; 2.State Key Laboratory of Coal Combustion, School of Energy and Power Engineering，Huazhong Univers

Lianying SHAN / China-EU Institute for Clean and Renewable Energy at Huazhong University of Science and Technology

Qiangqiang REN / State Key Laboratory of Coal Combustion, School of Energy and Power Engineering，Huazhong University of Science and Technology

Huini LOENG / China-EU Institute for Clean and Renewable Energy at Huazhong University of Science and Technology

Jun XIANG / 1.China-EU Institute for Clean and Renewable Energy at Huazhong University of Science and Technology; 2.State Key Laboratory of Coal Combustion, School of Energy and Power Engineering，Huazhong Univers

Sheng SU / 1.China-EU Institute for Clean and Renewable Energy at Huazhong University of Science and Technology; 2.State Key Laboratory of Coal Combustion, School of Energy and Power Engineering，Huazhong Univers

Yi WANG / 1.China-EU Institute for Clean and Renewable Energy at Huazhong University of Science and Technology;2.State Key Laboratory of Coal Combustion, School of Energy and Power Engineering，Huazhong Universi

摘要

Three typical Chinese coals: Hongshaquan coal (HSQ), Wucaiwan coal (WCW) and Shenmu coal (SM) with different moisture contents (0%, 25%, 50%, 75% and 100%) were selected to complete uniaxial compression experiments by self-designed mechanical test and image acquisition bench to study the influence of moisture content on the mechanical properties during crushing. The fractal theory was then applied to analyze the mesostructure of coal surface with the coal surface images collected by high-speed camera. The results showed that the higher the degree of coalification, the greater the compressive strength. The compressive strength and elastic modulus of HSQ and WCW whose degree of coalification are low possess positive relationship with moisture content, contrary to SM. The fragile interval of the HSQ is between 0-25% of relative moisture content, the WCW is easily broken at about 25%, and the SM is the most vulnerable to breakage at 100%. Besides, there is a nonlinear relationship between the surface mesostructure and mechanical properties during coal crushing process while moisture factor was defined to express the effect of moisture.