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相对密度是天然气特征评价和测量用的基本性质参数之一。许多仪器和方法都可用来测定天然气的比重。这些仪器在操作原理、效率和准确度方面各不相同。因此在选择方法和仪器时很难给用户以明确的参考和指导。这篇文章从不同方面对常用相对密度测定方法进行了评价和比较;按照类型对每种方法作了说明,同时分析了操作原理和控制方程;完成了测量误差的计算;测定了随机误差的可信程度;最后比较了各种方法的结果。
Relative density is one of the basic parameters of natural gas characterization and measurement. Many instruments and methods can be used to determine the specific gravity of natural gas. These instruments vary in operating principle, efficiency and accuracy. Therefore, in the choice of methods and equipment is difficult to give users a clear reference and guidance. This article evaluates and compares commonly used methods of determining relative densities from different aspects; explains each method by type, analyzes operating principles and governing equations; computes measurement errors; and measures random errors The degree of the letter; Finally, the results of various methods are compared.