A method of measuring the parameters of gas-liquid flow

 

(57) Abstract:

Usage: the invention is intended for use on metering tank oil to measure the volume fraction of free gas and the density of pure oil with no gas in the flow of oil. The inventive method consists in irradiation of the gas-liquid stream is narrow and at least one wide beam of ionizing radiation, registration direct and scattered radiation that has passed through the controlled environment, the formation of the corresponding signals in the form of discrete samples and the grouping of samples and a sample of a given size. The sample corresponding to the backscattered radiation, determine the density of the gas mixture. The samples corresponding to the direct radiation, determine the values of the autocorrelation function, and these sample group from the original sample sequence by sliding it with a fixed-width box, shifting the window by one sample for each sample. Next, form an additional sequence of samples on the condition that the values of the autocorrelation function of all samples, including the reference, does not exceed the threshold value and the sequence determined is the means of measurement of parameters of gas-liquid flows, such as the density of the gas mixture, the density of the liquid, the volume fraction of free gas, and can be used in the oil industry in the metering tank oil and other industries for research and monitoring of parameters of two-phase gas-liquid flows in various technological processes.

Known methods of measuring the density of liquid media, the average density of the mixture, the volume fraction of free gas (true volumetric gas content) gas-liquid flows, based on irradiation of a controlled volume of a narrow (wide) beam of ionizing radiation and reception held through a controlled environment direct (diffuse) radiation. With the measured parameters of the controlled environment is judged by the amount of flow of the detected radiation. (HART, Radioisotope density measurement of liquids and binary systems. M Atomizdat, 1975, 106-109 C., Goldin M. L. Theoretical basis of the measurement technique of photon radiation, M. Energoatomizdat, 1985, S. 60-64, 69).

When using a narrow collimated beam of radiation and detectors with small in comparison with the controlled object sizes scattered gamma quanta virtually no registriruyushchei.

The advantage of radioisotope methods of control parameters of gas-liquid flows in their non-contact. If their application is not disrupted the flow pattern of gas-liquid mixture.

However, the known methods have disadvantages. For example, when measuring the volume fraction of free gas, you must know the density of the liquid and to monitor its changes during measurements. A variety of structures of gas-liquid flows result in different spatial distributions of the gas and the liquid in the pipeline and entails the need to control the entire cross-section. In addition, density fluctuations controlled environment, typical for gas-liquid flows, create additional measurement error due to the so-called "dynamic offset".

These circumstances taken into account in the measurement of true volumetric gas content in gas-liquid flows [1] which is based on aggregate characteristics closest to the claimed method. In it, as well as in the claimed method, is exposed to the controlled environment in pipe cross section by a narrow beam of ionizing radiation, register direct radiation passing through the controlled environment, form, accordingly, the aqueous volume, determine the values of the structural function, uniquely associated with the autocorrelation, and compare them with a threshold value. In this way a controlled volume (cross section of the pipeline) are divided into elementary volumes (chord), while the operations described above are performed for each of the monitored volume and the density of the liquid phase is defined as the average density of the controlled environment in the elementary volumes, in which the structural function is equal to zero.

As can be seen from the above, in this way need to scan gamma radiation each elementary controlled volume. For this purpose, the measurement source and the radiation detector is moved relative to the cross section of the pipe. This is acceptable when single measurements in the research process liquid flow, but is not suitable for continuous measurements in the process of industrial implementation of the method.

In the oil industry for metering oil pump stations must be measured as the density of the oil, the volume fraction of free gas in the flow of crude product. Moreover, the measurement method must provide the radiation relative to the cross section of the pipe, a long measurement time, and greater complexity significantly reduce operational characteristics known way.

Required technical result consists in increasing performance, is achieved in the proposed method of measurement of parameters of gas-liquid flow by irradiation controlled environment by a narrow beam of ionizing radiation, registration direct radiation transmitted through a controlled environment, the formation of the corresponding signal in the form of discrete samples at fixed time points, the grouping of samples in a sample of a given size, the determination of the values of the autocorrelation function of received samples and comparing them with a threshold value, as well as additional exposure controlled environment by at least one beam of ionizing radiation directed at an angle to a narrow, registration of radiation scattered controlled environment, and the formation of the corresponding signal, which determines the density of the gas mixture. In this sample, which determine the values of the autocorrelation function, are grouped from the original sample sequence by sliding on her window formiruyut from the initial sequence additional condition the values of the autocorrelation functions of all samples, including the reference, does not exceed the threshold value and this sequence determines the density of the liquid.

The angle between the narrow and wide beams of ionizing radiation is selected based on the specific measurement conditions and design requirements.

In the proposed private case controlled environment is irradiated along the chord of the cross section of the pipeline two colliding wide beam of ionizing radiation, and the narrow beam is directed to the diameter of the cross section perpendicular to a given chord.

The position of the specified chord determined during calibration of the device that implements the method, based on the conditions for obtaining the required type conversion functions.

Additional training in the controlled environment of a wide beam of ionizing radiation and registration of the scattered radiation measure the density of the gas-liquid mixture in the entire cross section of the pipe without movement source and radiation detector.

When determining the fluid density to weaken the narrow beam of the direct radiation and the application of the proposed transactions signal processing, the CE measurements.

The ability to measure fluid density of the proposed method follows from established authors experimentally and confirmed theoretically flow patterns of gas-liquid mixtures with a low content of free gas. This feature is that when the movement of the mixture through the pipeline, with no local hydraulic resistances, free gas is grouped in the cluster of small bubbles. These clusters are separated by plugs clean gas from the liquid.

The proposed procedure of signal processing allows to detect tube fluid and to measure the density of the liquid at the moment of passage of such traffic.

Thus, the inventive method of measurement allows you to refuse the transfer source and the radiation detector. Due to this reduced measurement time, reduces the complexity of the method, i.e., improve its performance, and that is the desired effect.

Regarding the third measured parameter of gas-liquid flow - volume fraction of free gas, then knowing the density of the gas mixture and the density of the liquid without gas, it is determined by the known value

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where the volume fraction of free same shows a block diagram of the device, implements the inventive method.

This device contains blocks radiation sources (bija) 1-3, a detection unit (DB) 4 and the computing device (WS) 5. Bija 1 and the database are located on opposite sides of the pipe 6 along its diameter. Bija 2 and 3 are also located on opposite sides of the pipeline along the chord perpendicular to the specified diameter.

Using the bija 1 controlled environment is irradiated by a narrow beam of ionizing radiation. For this bija 1 includes a collimator that forms a narrow beam. Simultaneously controlled environment irradiate a wide beam of ionizing radiation from the bija 2, covering the whole cross-section of the pipeline.

In the particular case to create a more uniform field exposure and increase measurement accuracy controlled environment irradiate counter a wide beam of ionizing radiation from the bija 3. From bija 2 and 3 at the detector, the database gets radiation, ambient controlled environment and the pipe walls.

Using the database of direct and diffuse radiation register and generate corresponding signals. To do this, in the database there are several, at least two energy Windows registration of ionizing radiation. When the new Cesium-137, registered direct radiation is carried out in the energy range above 550 V and registration scattered in the range from 30 to 550 V. The database has two outputs, marked on the figure "30" and "550", which receives signals in the form of a sequence of electrical pulses, normalized in amplitude and duration.

The sequence of pulses from outputs of the database of enter the WU 6. Using WU perform the following operations:

form the corresponding source signals in a sequence of timing pulses at fixed time points;

group the counts in a sample of a given size, while sampling from the original sample sequence corresponding to the direct radiation, grouped by sliding it with a fixed-width box, and a slide carried out by shifting the window for each sample by one sample;

the samples are grouped from samples corresponding to the backscattered radiation, determine the density of the gas mixture calibration dependence;

the samples are grouped from samples corresponding to the direct radiation, determine the values of the ACF;

compare the value of the ACF with the threshold value defined billing purposes, what is the ACF of all samples, including the sample and the number of which is determined by the width of the window, do not exceed the threshold value;

sample grouped from the reading of additional sequences, determine the density of the liquid in the calibration dependence;

determine the volume fraction of free gas at a known value (1).

If there is a specific implementation of the method on the pipeline with a diameter of 250 mm controlled environment is irradiated with three standard bija, charged radionuclide Cesium-137 activity order 6,0109Bq. In collimation channel bija, located on pipe diameter, inserted additional collimator forming a narrow beam of gamma izlucheniya. Bija intended for exposure to a wide beam, placed on opposite sides of the pipeline along the chord perpendicular to said diameter, and spaced from the edge of the pipe 70 mm

Direct and diffuse radiation is recorded by a database that includes a scintillation counter gamma radiation on the basis of the crystal NAJ(T1) size h and the photomultiplier tube PMT-115. Setting the counter corresponding thresholds, gamma-ray quanta recorded in energy what it was a specialized microprocessor-based device series To 580. Discrete samples are generated from the input pulses DB duration of 0.5 MS at intervals of about 6 msec in 1 msec. Sample size to determine the ACF (fixed window width) were chosen in the range from 30 to 70 times. The size of the array of samples, which carried out the slide 250. Volume to determine the measured value is determined depending on the required accuracy of measurement.

Experimental testing of the method that is listed on the bubbling metrological installation in the range of the volume fraction of free gas from 0 to 0.03 Rel.ed. confirmed its efficiency. Evaluation of reduced error of measurement of the volume fraction of free gas was 0.2%

1. A method of measuring the parameters of gas-liquid flow by radiation in a narrow beam of ionizing radiation, registration direct radiation transmitted through a controlled environment, the formation of the corresponding information signal in the form of discrete samples at fixed time points, the grouping of samples in a sample of a given size, determine the values of the autocorrelation function of received samples and comparing them with a threshold value, different teenie, directed at an angle to a narrow, registered radiation, ambient controlled environment, generate a corresponding signal, which determines the density of the gas mixture and the sample, which determine the values of the autocorrelation function, are grouped from the original sample sequence by sliding it with a fixed-width box, and a slide carried out by shifting the window for each sample by one sample, then formed from the original sample sequence additional condition that the values of the autocorrelation functions of all samples, including the reference, does not exceed the threshold value, and the sequence of samples to determine the density of the liquid.

2. The method according to p. 1, wherein the controlled environment is additionally irradiated along the chord of the cross-section of piping two colliding wide beam of radiation, and the narrow beam is directed to the diameter of the cross section perpendicular to a given chord.

 

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