[1]王 凯,翟小伟,王炜罡,等.氧浓度与风量对煤热物性参数影响的实验研究[J].西安科技大学学报,2018,(01):31-36.[doi:10.13800/j.cnki.xakjdxxb.2018.0105]
 WANG Kai,ZHAI Xiao-wei,WANG Wei-gang,et al.Influence of oxygen concentration and blowing rate on thermal properties of coal[J].Journal of Xi'an University of Science and Technology,2018,(01):31-36.[doi:10.13800/j.cnki.xakjdxxb.2018.0105]
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氧浓度与风量对煤热物性参数影响的实验研究(/HTML)
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西安科技大学学报[ISSN:1672-9315/CN:61-1434/N]

卷:
期数:
2018年01期
页码:
31-36
栏目:
出版日期:
2018-01-15

文章信息/Info

Title:
Influence of oxygen concentration and blowing rate on thermal properties of coal
文章编号:
1672-9315(2018)01-0031-06
作者:
王 凯12翟小伟12王炜罡12文 虎12
1.西安科技大学 安全科学与工程学院,陕西 西安 710054; 2.西安科技大学 陕西省煤火灾害防治重点实验室,陕西 西安 710054
Author(s):
WANG Kai12ZHAI Xiao-wei12WANG Wei-gang12WEN Hu12
1.College of Safety Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China; 2.Shaanxi Key Laboratory of Prevention and Control of Coal Fire,Xi'an University of Science and Technology,Xi'an 710054,China
关键词:
安全科学与工程 煤自燃 氧浓度 风量 导热系数 热扩散系数
Keywords:
safety science and engineering coal spontaneous combustion oxygen concentration blowing rate heat conductivity thermal diffusivity
分类号:
TD 75.2
DOI:
10.13800/j.cnki.xakjdxxb.2018.0105
文献标志码:
A
摘要:
为了研究氧浓度与风量对煤自燃过程传热特性的影响,采用激光导热分析仪,研究了不同氧浓度与风量条件下煤的热扩散系数、比热容与导热系数变化特征,发现煤样的热扩散系数随温度的升高总体呈下降趋势,而比热容表现为线性增加,导热系数随着温度的升高呈缓慢的非线性增长特征; 纯氧条件下煤的热扩散系数略高于空气气氛,比热容则低于空气气氛,综合效应表现为氧浓度对煤升温过程中导热系数无明显影响; 而供风量的增加明显降低了煤样的热扩散系数与比热容,综合表现为导热系数的降低。结果表明:氧浓度对煤氧化升温过程传热特性影响较小,而风量对实验煤样导热系数的变化具有显著影响,是煤自燃传热过程研究应考虑的重要因素。
Abstract:
In order to study the influence of oxygen concentration and blowing rate on heat transfer characteristics in the process of coal spontaneous combustion,laser thermal analysis experiments were carried out to identify specific heat,thermal diffusion coefficient and thermal conductivity characteristics under the conditions of different oxygen concentrations and blowing rates.The thermal conductivity of the coal sample showed a downward trend with the rising of temperature,yet heat capacity increased linearly.The coefficient of thermal conductivity was slowly nonlinear growth with the increasing of the temperature.The thermal diffusion coefficient of coal under pure oxygen condition was slightly higher than that at air atmosphere,and the specific heat capacity waslower than that at air temperature,resulting in comprehensive performance of nonobvious effect on the thermal conductivity of coal during the heating process of coal.The increase of bolwing rate significantly reduced the thermal diffusion coefficient and specific heat capacity of the coal samples,leading to the reducing of thermal conductivity of coal.The results show that oxygen concentration has little impact on heat transfer characteristics in coal oxidation process,but blowing rate affects the thermal conductivity significantly,which is the important factor of heat transfer during coal spontaneous combustion.

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备注/Memo

备注/Memo:
基金项目:国家自然科学基金(51704226); 中国博士后科学基金(2016M592819); 陕西省自然科学基础研究计划(2017JQ5047); 陕西省教育厅科研计划(17JK0500)
通信作者:王 凯(1987-),男,山东乳山人,博士,讲师,E-mail:wangk912@xust.edu.cn
更新日期/Last Update: 2018-03-12