摘要
为提升光干涉式甲烷浓度测定器的测定精度与适用范围,解决煤矿井下低氧环境中测量结果不稳定、测定值偏差较大等问题,以传统光干涉式甲烷浓度测定模型为基础,结合影响测定精度的环境温度、气压因素,并融入井下含CH_(4)混合气体中O_(2)、N_(2)的气体组分浓度的影响因子,将传统光干涉式甲烷浓度测定模型中除CH_(4)外的混合气体折射率由定值转换为以气体组分体积分数决定的变量,以此研究并构建了光干涉式甲烷浓度测定优化模型。设计了实验室标准气样测试对比实验,选取体积分数为18.00%、19.00%、20.00%3种O_(2)及体积分数为0.50%、1.00%、1.50%3种CH_(4),共配制9组不同体积分数的含O_(2)、CH_(4)、CO_(2)、N_(2)等4种气体的混合气体,对优化模型进行对比测试及其准确性验证。实验结果表明:利用建立的优化模型计算的CH_(4)体积分数与实验室所配制的标准气样中CH_(4)体积分数一致,且不受O_(2)体积分数变化影响,最大误差不超过0.03%,优化模型精度明显优于传统光干涉式甲烷浓度测定器。优化后的光干涉式甲烷浓度测定模型提升了测定精度,克服了传统光干涉式甲烷浓度测定器易受环境中O_(2)浓度变化而影响测定准确性的缺点,更加适用于煤矿井下大气成分多变环境中的CH_(4)浓度测定。
To enhance the accuracy and applicability of optical interference methane concentration analyzers,particularly in the low-oxygen environments of underground coal mines,this study addresses the common issues of unstable readings and large measurement deviations.Building on the traditional optical interference methane concentration model,we incorporated the effects of environmental temperature,air pressure,and the varying concentrations of O_(2)and N_(2)in methane-containing gas mixtures.Based on these considerations,we developed and constructed an optimized measurement model in which the refractive index was treated as a variable rather than a fixed parameter.To validate the improved model,we conducted comparative laboratory experiments using standard gas mixtures.We prepared nine different mixtures containing O_(2),CH_(4),CO_(2),and N_(2),varying O_(2)concentrations at 18.00%,19.00%,and 20.00%,and CH_(4)concentrations at 0.50%,1.00%,and 1.50%.The results showed that the methane concentrations calculated by the optimized model closely matched the laboratory standard values and were unaffected by changes in O_(2)concentration.The maximum error did not exceed 0.03%,demonstrating significantly higher accuracy than traditional optical interference analyzers.In summary,the optimized optical interference methane concentration measurement model not only improves accuracy but also overcomes the limitations of traditional analyzers,which are sensitive to environmental O_(2)levels.This makes the new model more suitable for accurately measuring methane concentrations in the complex environments of underground coal mines.
作者
隆清明
胡杰
文志杰
LONG Qingming;HU Jie;WEN Zhijie(State Key Laboratory of Coal Mine Disaster Prevention and Control,Chongqing 400037,China;CCTEG Chongqing Research Institute,Chongqing 400037,China;School of Mining,Guizhou University,Guiyang 550025,China)
出处
《矿业安全与环保》
北大核心
2025年第4期1-6,共6页
Mining Safety & Environmental Protection
基金
国家自然科学基金项目(52274150)
重庆市杰出青年科学基金项目(CSTB2022NSCQ-JQX0014)。
关键词
甲烷浓度
干涉条纹
折射率
测定模型
优化应用
methane concentration
interference fringe
refractive index
measurement model
optimize application
作者简介
隆清明(1982-),男,山东东营人,博士,研究员。E-mail:cqlqm2008@163.com。
