热导法测定固体生物质燃料中碳氢氮含量的称样量试验研究  

The study of sample mass for determination of carbon,hydrogen and nitrogen content in solid biomass fuel by thermal conductivity method

作　　者：龚婉莉 马克富 车永芳 李梦凡 GONG Wanli;MA Kefu;CHE Yongfang;LI Mengfan(China Coal Research Institute Corporation Ltd.,Beijing 100013,China;National Coal Quality Inspection and Testing Center,Beijing 100013,China)

机构地区：[1]煤炭科学技术研究院有限公司,北京100013 [2]国家煤炭质量检验检测中心,北京100013

出　　处：《煤质技术》2024年第4期79-84,91,共7页Coal Quality Technology

基　　金：煤炭科学技术研究院有限公司技术创新II类基金资助项目(2022CX-II-14)。

摘　　要：固体生物质燃料中碳、氢、氮含量的快速准确测定,对于指导固体生物质燃料的生产及控制大气污染具有重要意义,而样品称样量的大小将直接影响热导法的测定时间、测定成本及测定结果准确度。选取15种代表性固体生物质燃料样品,在10~100 mg称样量范围内设置6个梯度,采用元素分析仪进行碳、氢、氮含量的测定,通过数理统计及作图分析对不同称样量范围下的碳、氢、氮测定结果进行精密度及准确度分析,确定适宜的称样量。结果表明,当称样量为50~70 mg时,15个样品的碳、氢、氮含量测定结果与参考值之差均符合要求,且测定结果变化趋势平缓;50、60、70 mg称样量下的碳、氢、氮含量测定结果的精密度及准确度无显著性差异,因而热导法测定碳氢氮含量的称样量50~70 mg最为适宜。The fast and accurate determination of carbon,hydrogen and nitrogen content in solid biomass fuel is of great significance for guiding the production of solid biomass fuel and controlling air pollution.The sample mass affects the measurement period,measurement cost and accuracy of results by using thermal coductivity method directly.There were 15 representative solid biomass fuels samples selected for determining the carbon,hydrogen and nitrogen contents in 6 gradients at the weighing range from 10~100 mg.The precision and accuracy analysis of the carbon,hydrogen and nitrogen contents with different sample masses were analyzed by using mathematical statistics and figuring.The appropriate sample range was determined.The results show that,the carbon,hydrogen and nitrogen contents of all samples can meet the requirements at the sample mass of 50~70 mg,and the trend of changes in the measurement results is gentle.There is no significant difference in the precision and accuracy of the carbon,hydrogen and nitrogen contents at 50,60 and 70 mg,which shows no obvious pattern,so that it is recommended that the sample mass should be 50~70 mg.

关 键 词：称样量 热导法 固体生物质燃料 碳 氢 氮 称样量 

分 类 号：TQ531[化学工程—煤化学工程]