RU2013116242A

RU2013116242A - METHOD FOR MEASURING THE FLOW OF MULTIPHASE LIQUID

Info

Publication number: RU2013116242A
Application number: RU2013116242/28A
Authority: RU
Inventors: Сергей Владимирович Шумилин; Владимир Николаевич Шумилин
Original assignee: Сергей Владимирович Шумилин; Владимир Николаевич Шумилин
Priority date: 2013-04-09
Filing date: 2013-04-09
Publication date: 2014-10-20
Also published as: RU2531036C1

Abstract

Способ измерения расхода многофазной жидкости, заключающийся в измерении акустического шума, создаваемого движением жидкости при протекании ее через известное сечение, скорость прохождения жидкости определяют по частоте акустических шумов, вызываемых неравномерностью движения жидкости, предварительно измеряют температуру потока и давление в трубе, плотности каждой из фаз, а затем, на основе предложенных зависимостей рассчитывают объемную или массовую доли каждой фазы отличающийся тем, что используя лабораторные результаты составляют уравнения зависимости скорости звука каждой фазы от давления и температуры, а уравнение скорости звука для воды дополняют зависимостью от солености воды, при этом полученные уравнения записывают в расчетный блок, измеряют давление и температуру в трубопроводе, измеряют соленость воды, измеряют и записывают амплитуды и частоты колебаний трубы, по которой протекает многофазная жидкость, измеряемый диапазон частот делят на части соответствующие каждой фазе, в каждой из частей после применения быстрых преобразований Фурье выделяют максимальные значения амплитуд и соответствующие им частоты, и вычисляют объемный расход каждой фазы жидкости по формулегде Q - объемный расход отдельной фазы многофазной жидкости, м/с;R - радиус трубы, м;F - максимальная частота вибрации в выделенном для отдельной фазы диапазоне, 1/с;А - максимальная амплитуда колебаний на частоте F, м;K - безразмерный коэффициент пропорциональности, учитывающий особенности протекания многофазной жидкости по трубопроводу при калибровке виброакустического датчика на трубопроводе;C - скорость звука в измеряемой фA method of measuring the flow rate of a multiphase liquid, which consists in measuring the acoustic noise generated by the movement of the liquid when it flows through a known section, the speed of passage of the liquid is determined by the frequency of acoustic noise caused by uneven movement of the liquid, the flow temperature and pressure in the pipe, the density of each phase are pre-measured, and then, based on the proposed dependencies, the volume or mass fractions of each phase are calculated, characterized in that, using laboratory results, the equations of the dependence of the sound velocity of each phase on pressure and temperature are supplemented, and the equation of the speed of sound for water is supplemented by the dependence on the salinity of the water, while the obtained equations are written into the calculation block, the pressure and temperature in the pipeline are measured, the salinity of the water is measured, the amplitudes and frequencies are measured and recorded oscillations of the pipe through which the multiphase fluid flows, the measured frequency range is divided into parts corresponding to each phase, in each of the parts after applying fast Fourier transforms, a poppy the maximum values of the amplitudes and the frequencies corresponding to them, and calculate the volumetric flow rate of each phase of the liquid according to the formula Q is the volumetric flow rate of an individual phase of a multiphase liquid, m / s; R is the radius of the pipe, m; F is the maximum vibration frequency in the range allocated for an individual phase, 1 / s; A - maximum amplitude of oscillations at a frequency F, m; K - dimensionless coefficient of proportionality, taking into account the features of the multiphase fluid flowing through the pipeline when calibrating the vibroacoustic sensor in the pipeline; C - sound velocity in the measured

Claims

A method of measuring the flow rate of a multiphase liquid, which consists in measuring the acoustic noise generated by the movement of the liquid when it flows through a known section, the speed of passage of the liquid is determined by the frequency of acoustic noise caused by uneven movement of the liquid, the flow temperature and pressure in the pipe, the density of each phase are pre-measured, and then, based on the proposed dependencies, the volume or mass fractions of each phase are calculated, characterized in that, using laboratory results, the equations of the dependence of the sound velocity of each phase on pressure and temperature are supplemented, and the equation of the speed of sound for water is supplemented by the dependence on the salinity of the water, while the obtained equations are written into the calculation block, the pressure and temperature in the pipeline are measured, the salinity of the water is measured, the amplitudes and frequencies are measured and recorded oscillations of the pipe through which the multiphase fluid flows, the measured frequency range is divided into parts corresponding to each phase, in each of the parts after applying fast Fourier transforms, a poppy the maximum values of the amplitudes and their corresponding frequencies, and calculate the volumetric flow rate of each phase of the liquid according to the formula

Q : = \frac{π \cdot R^{four} \cdot F^{3} \cdot A \cdot K}{four \cdot C^{2}},

where Q is the volumetric flow rate of an individual phase of a multiphase liquid, m ³ / s;

R is the radius of the pipe, m;

F - maximum vibration frequency in the range allocated for an individual phase, 1 / s;

And - the maximum amplitude of the oscillations at a frequency F, m;

K is the dimensionless coefficient of proportionality, taking into account the features of the multiphase fluid flowing through the pipeline when calibrating the vibroacoustic sensor on the pipeline;

C is the speed of sound in the measured phase of a multiphase liquid, calculated from empirical dependences on pressure and temperature, and for water, additionally on salinity.