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| Standard Facility of Natural Gas Energy Measurement Based on Verification Method of Sound Velocity |
| WANG Hai-tong1,LI Chun-hui2,LI Meng-na2 |
1. College of Quality and Technical Supervision, Hebei University, Baoding, Hebei 071002, China
2. National Institute of Metrology, Beijing 100029, China |
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Abstract For the energy flow measurement of natural gas, the measurement frequency of component data of natural gas is relatively low, which results in that the change of calorific value within the cycle cannot be found. The mathematical model of the sound velocity to verify energy is built based on the use the sound velocity to verify changes of the calorific value and compression factor caused by changing of components. Based on this theory, the standard facility of natural gas energy measurement is built, which has a measurement capability of 10MPa and 2000m3/h, and the measurement frequency of energy flow has been improved from the original minute level to the second level. The uncertainty of the standard facility is evaluated through the measurement of the natural gas energy flow rate on site, which is 0.33% (k=2) for the relative expanded uncertainty.
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Received: 10 March 2021
Published: 19 September 2022
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2022, Vol. 43 
