摘要
为探究环境因素作用下的褐煤电性参数变化特征,选取新疆矿区褐煤煤样,利用煤电性参数测试装置,在不同温度、不同浸水时长以及不同测试频率条件下,开展试验,测试干燥煤样和浸水煤样的电阻率和介电常数,探索多因素叠加作用对褐煤电性参数变化特征的影响机制。研究结果表明:相同浸水时间和温度条件下,测试频率越高,褐煤的电阻率以及介电常数越小;浸水时间达到12 h后,不同温度和不同测试频率条件下褐煤电阻率均迅速下降,浸水时间超过12 h后电阻率趋向稳定,干燥褐煤对水分的吸收趋于饱和;当煤样温度低于40℃时,不同测试频率条件下,随浸水时间的增加,褐煤介电常数增加幅度较大;105Hz测试频率条件下,当煤样温度升高至40~55℃时,煤样电阻率变化明显,温度因素对褐煤电阻率影响较大;测试频率低于105Hz且煤样浸水时间超过24 h条件下,当温度升高至40~55℃时,煤样介电常数变化显著,温度因素对褐煤介电常数影响明显。
In order to study change characteristics of lignite’s electrical parameters under influence of environmental factors,with lignite coal from Xinjiang mining area as samples,experiments were conducted in conditions of different temperature,different immersion time and test frequencies by using a test device of coal electrical parameters.Resistivity and dielectric constant of dry and water-soaked coal samples were tested and influence mechanism of multiple factors’superposition on change characteristics of parameters was explored.The results show that under same immersion time and temperature,the higher test frequency is,the smaller resistivity and dielectric constant there will be.When immersion time reaches 12 hours,resistivity decreases rapidly under different temperature and test frequency.Once it exceeds 12 hours,resistivity tends to be stable,and moisture absorption of dry lignite tends to be saturated.As temperature of coal samples is lower than 40℃,dielectric constant increases greatly with an increase of water immersion time for different test frequency.At a test frequency of 105 Hz,when coal sample temperature rises to 40-55℃,resistivity changes remarkably and is significantly influenced by temperature factor.However,when it is lower than 105 Hz and immersion time exceeds 24 hours,at the same temperature of 40-55℃,dielectric constant changes notably and is significantly influenced by temperature.
作者
牛会永
刘轶康
聂琦苗
鲁义
李石林
胡相明
NIU Huiyong;LIU Yikang;NIE Qimiao;LU Yi;LI Shilin;HU Xiangming(School of Civil and Resource Engineering,Beijing University of Science and Technology,Beijing 100083,China;School of Resources,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan Hunan 411201,China;School of Safety and Environmental Engineering,Shandong University of Science and Technology,Qingdao Shandong 266590,China)
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2020年第9期37-42,共6页
China Safety Science Journal
基金
国家自然科学基金资助(51874131,51474106)
湖南省教育厅优秀青年项目(18B213)。
关键词
浸水时间
电性参数
测试频率
电阻率
介电常数
immersion time
electrical parameters
test frequency
resistivity
dielectric constant
