天然气分析

[中文适用范围]： 本文件介绍了几种用于测量天然气和生物甲烷中痕量（µmol mol-1）氨含量的测试方法。介绍了适用于几种不同氨测量系统的甲烷中加压氨混合物的适当处理和采样。测量系统由现成的专用于氨的商业光谱分析仪组成。这些 NH3 分析仪在操作方面被视为黑匣子，取决于制造商的说明。该文件介绍了适当的校准和测量策略，用于量化（生物）甲烷中 10 mg m-3（14 µmol mol-1）左右及以上的氨，适用于绝对压力范围 1 bar – 2 bar、温度 0 °C – 40 °C 和相对湿度范围内的分析 [外文原描述]： This document describes several test methods for measuring the ammonia amount fraction in natural gas and biomethane at the trace level (µmol mol -1 ). The suitable handling and sampling of pressurised mixtures of ammonia in methane that are applied to several different ammonia measurement systems are described. The measurement systems are comprised of readily available commercial spectroscopic analysers that are specific to ammonia. These NH 3 analysers are considered as a black box in terms of their operation, which is dependent on the instructions of the manufacturer. The document describes suitable calibration and measurement strategies to quantify ammonia in (bio)methane around and above the 10 mg m -3 (14 µmol mol -1 ) level and applies to analysis within absolute pressure ranges of 1 bar – 2 bar, temperatures of 0 °C – 40 °C and relative humidity <90 %. References are also made to additional standards that are applied either to natural gas analysis or air quality measurements. In this document the matrix gas is always methane or biomethane and the measurand is the amount fraction NH 3 . NOTE 1 bar = 0,1 MPa =10 5 Pa; 1 MPa = 1 N/mm 2 .