Method and apparatus for measurement of composition and flow rates of a wet gas

摘要

A method for determining the flow rates of a fluid comprising a multi-component mixture of a gas and at least one liquid in a pipe, the method comprising the following steps: a. the permittivity of the multi-component mixture is determined based on an electromagnetic measurement, b. a statistical parameter related to the electromagnetic measurement is calculated, c. the density of the multi-component is determined, d. the temperature and pressure are obtained, e. based on the knowledge of densities and dielectric constants of the components of the fluid mixture, and the result from the above steps a-c, the water fraction of the multi-component mixture is calculated, characterized by a method for determining the liquid fraction and flow rates of the multi-component mixture where f. the liquid fraction is calculated based on the statistical parameter from step b and the calculated water fraction from step e using an empirical derived curve, g. the velocity of the multi-component mixture is derived, and h. based on the step a-g, the flow rate of the individual components of the multi-component mixture is calculated. An apparatus for performing the method is also disclosed.

主权项

1. A method for determining the flow rates of a fluid comprising a multi-component mixture of a gas and at least one liquid in a pipe, the method comprising the following steps:
a. determining the permittivity of the multi-component mixture based on an electromagnetic measurement, b. determining the density of the multi-component mixture, c. obtaining the temperature and pressure, d. using a density and a permittivity of each component of the fluid mixture, and the result from the above steps a-c, the water fraction of the multi-component mixture is calculated, determining the liquid fraction and flow rates of the multi-component mixture by: e. calculating a statistical parameter related to the electromagnetic measurement, f. calculating the liquid fraction based on the statistical parameter from step e and the calculated water fraction from step d using an empirical derived curve, g. measuring the velocity of the multi-component mixture is based on measurement of pressure drop across a restriction in the pipe, and h. based on steps a-g, the flow rate of the individual components of the multi-component mixture is calculated.