Measuring and testing – Volume or rate of flow – Of selected fluid mixture component
Patent
1995-12-22
1998-08-11
Chilcot, Richard
Measuring and testing
Volume or rate of flow
Of selected fluid mixture component
7386105, G01F 100
Patent
active
057929637
ABSTRACT:
In the case of the method for determining the total mass flow of a gas mixture (2) which flows through a line (1) under pressure, a gas contained in the gas mixture is used as tracer (3). With the aid of pressure measurements (9, 10) of the gas mixture, total pressure and of the tracer partial pressure, the molar proportions of the tracer in the gas mixture are first ascertained. In this case the pressure measurements take place during a first phase, with the line system (1) gas-tight, and in a further phase with the system enriched with tracer.
Solving the mass balances for the gas mixture and for the tracer makes it possible, by substituting the already determined tracer molar proportions, to calculate the total mass flow.
Tracer enrichment of the gas mixture is carried out at supercritical pressure ratios between the vacuum prevailing in the line and the pressure of the tracer to be fed in by a critical orifice (4) which is built into the line (1) upstream of the pressure measurement locations (9, 10).
REFERENCES:
patent: 3881351 (1975-05-01), Prachar
patent: 5190726 (1993-03-01), Shinoki et al.
Baumann Peter
Blangetti Francisco L.
Asea Brown Boveri AG
Chilcot Richard
Patel Harshad
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