| 摘要 |
<p>A method and apparatus for measuring volume correction in a gas pipeline (12) using a variable volume chamber (19) where the gas is sampled at the temperature and pressure of gas (11) in the pipeline (12). A portion of a known volume of sample gas is released and a change of volume in the sample chamber (19) is measured with respect to time, while maintaining temperature and pressure at pipeline conditions. The sample gas is then measured by a molar flow meter (34, 35, 36, 37) for molar flow rate at near base conditions. A microcontroller (31) calculates the molar density of the gas. Because the molar density of the gas has been measured at pipeline conditions, it can be multiplied by volumetric flow rate in the pipeline to provide base volumetric flow rate of the pipeline gas. A heating analyzer (38) is provided to determine heat content of the gas, and this is multiplied by volumetric flow rate to determine energy flow rate.</p> |
