SU625136A1

SU625136A1 - Method of measuring substance quality in multiphase streams

Info

Publication number: SU625136A1
Application number: SU772476942A
Authority: SU
Inventors: Август Львович Сейфер; Сергей Сергеевич Семенюта
Original assignee: Предприятие П/Я Г-4126
Priority date: 1977-04-21
Filing date: 1977-04-21
Publication date: 1978-09-25

Description

(54) СПОГОБ ИЗМЕРЕНИЯ КОЛИЧЕСТВА BED ECTBA В МНОГОФАЗНЫХ(54) MEANS OF MEASUREMENT OF THE QUANTITY OF BED ECTBA IN MULTI-PHASE

ПОТОКАХFLOWS

Изобретение относитс к измерительной технике и может быть использовано, в частноега , дл измерени количества вещества в многофазных потоках и потоках переменной плотности .The invention relates to a measurement technique and can be used, in particular, to measure the amount of a substance in multiphase flows and flows of variable density.

Известен способ измерени массового и объемного расхода фаз потока, основанный на одновременном измерении расхода и скорости движени рабочего вещества и его плотности в потоке и преобразовании полученных сигналов в выходной сигнал 1.There is a known method for measuring the mass and volume flow of the flow phases, based on the simultaneous measurement of the flow and speed of movement of the working substance and its density in the flow and the conversion of the received signals into the output signal 1.

При реализации этого способа используютс разнообразные типы расходомеров, скоростемеров и плотномеров.When implementing this method, various types of flow meters, speed meters and densitometers are used.

Недостатками известного способа вл н с низка точность измерени из-за необходимости осуществлени двух преобразований уже измеренных параметров потока (скорости и плотности ), сложность реализации, так как необходимо использовать специальные аналоговые схемы дл перемножени и интегрировани измеренных параметров потока, отсутствие в процессе измерений функциональной св зи между первичными преобразовател ми (скоростемером и плотномером), уменьшающей надеж-. The disadvantages of this method are low measurement accuracy due to the need to implement two transformations of the already measured flow parameters (speed and density), the complexity of implementation, since it is necessary to use special analog circuits for multiplying and integrating the measured flow parameters zi between the primary converters (speedometer and density meter), reducing the reliability.

носгь результатов и усложн ющей тарировку имерительного комплекса, так как тарировку скоростемера и плотномера необходимо проводить сначала по отдельности, а затем совместно .a lot of results and complicating the calibration of the imme- diate complex, since the calibration of the speedometer and the density meter must be carried out first separately and then jointly.

Цель изобретени - повьоиение точности измерени .The purpose of the invention is to improve the measurement accuracy.

Это достигаетс тем, что сигнал, соответствующий скорости, преобразуют в последовательность коротких импульсов, измершот плотюсть потока в моменты времени, соответствующие последовательности этих импульсов, и суммируют амплитуды сигналов, соответствующих гшотности.This is achieved by converting the signal corresponding to the velocity into a sequence of short pulses, measuring the flow flux at the times corresponding to the sequence of these pulses, and summing the amplitudes of the signals corresponding to the synchronicity.

На чертеже дана схема устройства, с помощью которого осуществл етс способ измерени количества вещества.In the drawing, a diagram of the device with which the method for measuring the amount of a substance is carried out.

Claims

The device contains a speed meter of the working medium 1, a transducer 2, a control unit 3, a density meter 4, a storage device 5 and a regrester 6, and the speed meter sensors 1 and the density meter 4 are placed directly on the pipeline 7 through which the multiphase flow 8 flows. The measurement method in the following. 3, .6 The signal corresponding to the speed of movement of the working medium 8 from the output of the speed meter 1 is automatically converted in block 2 into a sequence of short pulses that are fed to the input of the control unit 3. The latter turns on the density meter 4 for a time equal to the duration of the pulse to measure the amount of working substance located at the time of measurement in the area of the measuring section of the density meter 4, the length of which is Z. The signal from the output of the speed meter 1 is converted automatically in the entire working range of flow rates so that, first, the measurement of the density of the working substance in the measuring section of the densitometer 4 is significantly less than the change time of this section or the flow should not be shifted a value greater than the specified relative measurement error (j. Therefore, the pulse duration must satisfy the condition r id-Z / WT.e. HbT-second, the moments between the measurements of the density the flow is followed at intervals T, for which the part of the flow already measured by the densitometer 4, length C, is measured by the portion of the working substance. With a change in speed, the pulse period varies synchronously. The amplitudes of the signals from the stroke of the meter 4 from each measurement are summed in accumulator 5 and by the total stress in it recorded by the device 6, the amount of the working substance passed through the pipeline 7 is judged. Using the invention will allow to increase the measurement accuracy. Claim Method Measuring amounts of matter in M-luphase flows by simultaneously and continuously measuring the velocity and flux density and converting these signals, characterized in that, in order to improve accuracy, a signal that corresponds to the velocity is converted into a sequence of short pulses, the flux density is measured at times time, the corresponding sequence of these pulses, and CyMMHpJTOT amplitude of the signals corresponding to the density. Sources of information taken into account in the examination: 1. Kremlin P, P. Flow meters and quantity counters. L., 1975. time with. 659.

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