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- Title
空气和高压天然气实流标定涡轮流量计的差异性.
- Authors
刘夷平; 李海洋; 吴锦川; 沈 琼; 全晓军
- Abstract
With the rapid growth of natural gas supply and demand, the capacity of national natural gas flow measurement stations is incapable of meeting the periodic verification demands of medium- and high-pressure natural gas flowmeters installed in urban pipeline networks and local transmission and distribution lines, and a great number of turbine flowmeters involved in trade settlement have to be sent to statutory metrological verification institutions for calibration in atmospheric air, so the applicability of verification conclusions and calibration data is still controversial. To deal with this situation, this paper carried out actual flow calibration on 32 turbine flowmeters by using the flow calibration facility of atmospheric air (0.1 MPa) and the Germany national flow calibration facility of high-pressure natural gas (2.5 MPa and 5 MPa) respectively. Then, an extended calibration model for turbine flowmeters was introduced, and the errors were comparatively analyzed on the basis of Reynolds number. And the following research results were obtained. First, error lines under atmospheric pressure and high pressure are situated in different flow characteristic regions, so the calibration curves for atmospheric pressure and high pressure are not comparable. Second, the errors of turbine flowmeters in the range above the transition flow rate are only dependant on the Reynolds number. Third, under the working condition of each pressure interval, there are Reynolds number overlapping sections with similar errors. Fourth, with the increase of the working pressure, the corresponding errors can be considered as a continuous extension of turbine flowmeter's accuracy performance. Fifth, the effect of working medium on the performance of turbine flowmeters is not obvious. It is concluded that the calibration data in atmospheric air is not applicable to the verification and calibration of the flow meter for the working pressure above 0.4 MPa. It is feasible to make use of air to calibrate high-pressure natural gas flowmeters under restricted pressure conditions.
- Subjects
GERMANY; NATURAL gas reserves; TRANSITION flow; FLOW measurement; REYNOLDS number; ATMOSPHERIC pressure; NATURAL gas pipelines
- Publication
Natural Gas Industry, 2020, Vol 40, Issue 1, p119
- ISSN
1000-0976
- Publication type
Article
- DOI
10.3787/j.issn.1000-0976.2020.01.016