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热导式成分分析仪表,由于结构简单,使用维护方便,在近代工业生产上应用比较广泛。现从连续分析的角度,对其基本原理、结构装置、应用实例作一简略的介绍。一、基本原理1.气体的热导根据气体的热导理论(热能扩散理论),各种气体的热导率主要决定于气体分子结构特性的数值。如气体分子的直径愈小,则气体分子运动的平均速度愈大,气体的热导率愈大;此外气体的热导率又和分子的单位比热成正比。
Thermal conductivity component analysis instruments, due to its simple structure, easy to use and maintain, is widely used in modern industrial production. Now from the perspective of continuous analysis of its basic principles, structural devices, application examples for a brief introduction. I. BASIC PRINCIPLES 1. Thermal Conductivity of Gas According to the thermal conductivity theory of gas (thermal diffusion theory), the thermal conductivity of various gases mainly depends on the numerical values of structural characteristics of gas molecules. For example, the smaller the diameter of the gas molecules, the greater the average velocity of the gas molecules and the greater the thermal conductivity of the gas. In addition, the thermal conductivity of the gas is directly proportional to the specific heat of the molecule.