| 摘要 |
Provided is an apparatus for measuring a multiphase fluid stream which flows in a pipe comprising a measuring unit (11), coaxial to the pipe, consisting of an isokinetic sampling device (1) suitably configured for allowing the equidistribution of the flow at the inlet in n channels (6) having an area A, of which m are sampling channels (6a, 6b) and a flow restriction (13), both the measuring unit (11) and the restriction (13) equipped with differential pressure measuring means (12, 14), a phase separator (15) connected to the sampling device, measurers and regulation means downstream of said separator. A method in accordance with said apparatus comprises the isokinetic sampling of a portion q of the multiphase flow Q at the inlet, measuring the flow-rates of the liquid qand gas qof the portion sampled and calculating the liquid and gas flow-rates (Qand Q) from the sampling sections according to the equations Q=(m/n)∙qand Q=(m/n)∙q. The method provides isokinetic sampling for portions of flow removed ranging from 5 to 20%. |
