摘要
量热仪的热容量稳定性是准确获得煤炭可靠热值的基本前提,而氧弹是量热仪中供样品燃烧用的核心容器,其热传导性对量热仪的测量精准度有着较大的影响,因而研究量热仪中氧弹的热传导不确定性则可为提升量热仪的热容量稳定性及其测量精度提供支撑依据。针对量热仪中的氧弹部件,结合量热仪的工作原理及试验室环境要求,从氧弹的材质与弹筒壁厚及容积、氧弹芯内部组件的合理设计、氧弹整体清洁度3个角度分析影响氧弹热传导性的影响因素,并对2款不同型号的氧弹进行热传导性比对,以期有助于提高量热仪测试数据的稳定性。经燃烧试验发现,氧弹的热传导存在不确定性时会使仪器热容量不稳定,从氧弹整体清洁度进行试验分析则得出氧弹内、外表面油膜会导致热容量测试数据存在离散度变大的结论,由此提出减少氧弹热传导不确定性的措施,主要包括选择合适的氧弹材质、弹筒壁厚、氧弹容积,如氧弹材质宜选择镍铬或镍铬钼合金钢,氧弹容积一般为250~350 mL,弹筒壁厚宜为5~6 mm;优化氧弹芯结构中的陶瓷套、绝缘套等导热性能差的组件,氧弹结构尽可能简单且避免热传导路径过长;彻底清洁氧弹筒、氧弹盖、氧弹芯的内外表面,以清除油脂等异物对实验测定结果的干扰。
The stability of the heat capacity of the calorimeter is the basic premise to accurately obtain the reliable calorific value of coal,and the oxygen bomb is the core container for the combustion of samples in the calorimeter,and its thermal conductivity has a great influence on the accuracy of measurement of the calorimeter,so the study of the thermal conduction uncertainty of the oxygen bomb in the calorimeter can provide a supporting basis for improving the heat capacity stability and accuracy of measurement of the calorimeter.Regarding to the oxygen bomb in the calorimeter,combined with the working principle of the calorimeter and the environmental requirements of the laboratory,the influencing factors of the thermal conductivity of the oxygen bomb were analyzed from three perspectives:the material,wall thickness and volume of the oxygen bomb,the design of the internal components of oxygen bomb core,and cleanliness of oxygen bomb.The thermal conductivity of two different types of oxygen bombs were compared,in order to help improve the stability of the calorimeter test data.The combustion test found that when the thermal conduction of the oxygen bomb has uncertainty,the heat capacity of the calorimeter will be unstable.From the oxygen bomb surface cleanliness test,it is concluded that the oil film on the surface will cause a large dispersion of the heat capacity test data.Therefore,the measures to reduce the uncertainty of the oxygen bomb thermal conduction are proposed,mainly including the selection of the appropriate material,wall thickness and volume of the oxygen bomb.For example,nickel-chromium or nickel-chromium-molybdenum alloy steel is the proper material for oxygen bomb,the volume of the oxygen bomb is generally 250-350 mL,and the wall thickness of the oxygen bomb should be 5-6mm;the optimization of ceramic sleeve and insulation sleeve and other components with poor thermal conductivity in the oxygen bomb is needed,as simple as possible oxygen bomb structure is needed,too long thermal conduction paths i
作者
卫健
黄超
邹乐春
沈静
杨勇
WEI Jian;HUANG Chao;ZOU Lechun;SHEN Jing;YANG Yong(Fenyi Power Plant,SPIC Jiangxi Electric Power Corporation Ltd.,Fenyi 336607,China;Hunan Sundy Science and Technology Corporation Ltd.,Changsha 410205,China)
出处
《煤质技术》
2023年第4期91-97,共7页
Coal Quality Technology
基金
分宜电厂智慧燃料智能化验系统的研究与应用科技基金资助项目(JXGS-2022-17-13)。
关键词
量热仪
氧弹
热传导不确定性
热容量
弹筒壁厚
氧弹芯内部组件
清洁度
温度均衡性
calorimeter
oxygen bomb
thermal conduction
uncertainty
heat capacity
oxygen bomb thickness
oxygen bomb core internal components
cleanliness
temperature balance
