A method and flow meter for determining the flow rates of a...

G - Physics – 01 – F

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G01F 1/74 (2006.01) G01N 33/28 (2006.01)

Patent

CA 2548063

A method for determining the flow rates and/or composition of a fluid comprising a multi-component mixture of a gas and at least one liquid in a pipe comprises the following steps: electromagnetic loss and phase measurements are performed in at least two directions of the pipe; the degree of annular flow is determined based on the measurements of step a; the permittivity of the flow mixture is calculated based on the results from steps a and b, including corrections for the degree of annular flow; the mixture density is measured and compensated for the degree of annular flow; the temperature and pressure are obtained; the velocity of liquid and gas are determined, and based on the knowledge of densities and permittivities of the components of the fluid mixture, and the result from the above steps a-f, the volume and mass flow rates of the gas and liquid or liquids of the fluid mixture are calculated. A flow meter for performing the method is also disclosed.

L'invention concerne un procédé de détermination du débit et/ou de la composition d'un fluide comprenant un mélange à multiples composants d'un gaz et d'au moins un liquide dans un conduit. Ledit procédé consiste a) à effectuer des mesures de perte électromagnétique et de phase dans au moins deux directions du conduit, b) à déterminer le degré de flux annulaire en fonction des mesures de l'étape a, c) à calculer la permittivité du mélange fluidique en fonction des résultats des étapes a et b, y compris les corrections du degré de flux annulaire, d) à mesurer et à compenser la densité du mélange par rapport au degré de flux annulaire, e) à déterminer la température et la pression, f) à déterminer la vitesse du liquide et du gaz, et g) à calculer, à partir des densités et des permittivités des composants du mélange du fluide et du résultat des étapes a-f, le débit volumique et massique du gaz et du ou des liquides du mélange fluidique. L'invention concerne également un débitmètre permettant de mettre en oeuvre ledit procédé.

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