Apparatus for measuring concentration of dropping liquid in gas stream

FIELD: physics.

SUBSTANCE: apparatus for measuring concentration of dropping liquid in a gas stream has a filter unit with a sampling probe. The apparatus also has a gas collection nozzle with a flow regulator and a guide cylinder. The apparatus also has gas metre with a manometer and a thermometer. The apparatus is also fitted with a manual gear-rope drive with a spring-loaded position regulator for the filter unit with the probe and a linear scale on the guide cylinder. The apparatus also has a display for displaying the current gas flow rate and a set of removable probes with a different inner dimension.

EFFECT: high measurement accuracy owing to ensuring isokinetic collection of gas samples and wide range of using the apparatus depending on pressure in the gas pipeline.

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The invention relates to a device for measuring the content of the liquid droplet in the flow of natural and associated gas and can be used to evaluate the quality of the separation, preparation and determination of the loss of oil in the process of its production.

To determine the concentration of the liquid droplet in the gas stream in various industries used quite a variety of tools and measurement methods [1-4], author's certificate No. 583382 for 1974 and No. 742767 for 1978.

Most common in industrial practice, and then in the oil and gas industry has found a filtration method of measurement. On its base was created measuring the concentration of the liquid droplet [5], which works as follows. Part of the gas flow through the movable or stationary probe, located in the pipeline, is collected and purified from the liquid droplet in a filtering unit which consists of a perforated cartridge, covered with several layers of filter cloth. The number of captured the liquid droplet is determined by a calibrated transparent skimmers installed in the input and output zones of the filter node. The number of selected gas is set by the flow regulator and the dwell time on the gas meter. The concentration of the liquid droplet is determined by the ratio of the mass estimates is usasa in skimmers fluid to the volume of the selected gas.

The main disadvantage of this type of device [5] is that in the implementation of the measure is not provided maintenance in selected sample gas thermodynamic conditions of the gas stream pressure and temperature. If the temperature in the filter node is higher than the temperature of the gas stream, the liquid will evaporate and go into the gas phase, if it is lower because of a reduced pressure or atmospheric conditions, the amount of liquid phase increases due to condensation.

The second disadvantage of this meter is that with the increase in the viscosity of the liquid droplet is deteriorating drainage into the skimmers and much of it remains in the filter node and is not taken into account. At a very high viscosity, which possess some types of oils, drainage may not be measuring in this case, it is impossible to produce.

In addition, when this type of meter is a significant part of the liquid droplet by the action of turbulent pulsations, gravitational and inertial forces may fall in the supply tubing from the probe to the filter node and not to be taken into account.

Due to the above-mentioned disadvantages of the measured value of the concentration can be significantly undervalued or overvalued on an undefined value compared to the true C is achenium, that significantly reduces the accuracy and reliability of measurement.

The closest in technical essence is the meter [6], consisting of a lubricator, filter node sampling probe, inlet gas outlet with emphasis and flow regulator, guide cylinder with grooves for fixing the position of the filter node, gas meter with pressure gauge and thermometer.

In the manufacture of the measuring device is connected to the mounted on the gas valve and the filter node pre-weighed. The measurement process is carried out as follows. The valve is opened, the filter node is inserted to the desired depth in the pipeline and rotates the probe towards the stream, with emphasis pipe of the exhaust gas enters into the guide groove of the cylinder and fixes the position of the probe. Then control adjusts the gas flow in the optimal mode of operation of the counter to ensure isokinetic sampling and given exposure time. After this flow regulator is blocked off gas, filter node rises, the valve is closed, the meter is detached from it, the filter node is removed, weighed, determined by its gain. The concentration of the liquid droplet is determined by dividing the magnitude of the gain of the filter node to the quantity which has passed through it gas measured by the counter and adjusted to temperature and pressure in it.

In this construction of the meter is fixed on the challenges of the previous device. The performance of the filter node together with the probe helped to eliminate uncontrolled deposition of droplets in the inlet tubes. The location of the filter node at the time of measurement in the gas stream is provided a gas-sampling with preservation of thermodynamic conditions existing in the pipeline. The exception of skimmers and quick execution of the filtering node gave the possibility to determine the total mass of collected moisture.

All the above improvement has increased the accuracy and reliability of measurements.

Prolonged operation above described probe revealed two major flaws.

The first relates to the requirement of compliance with isokinetic sampling gas in which the flow velocity at the point of selection and the tip of the probe should be equal. The importance of compliance with this condition to ensure the accuracy and reliability of measurements adequately argued in [4]. The failure of the principle of isokinetic due to the following design defects meter.

- The number of selected process gas measurement more accurate and more convenient ODA is mine on the counter with digital display, as provided for in the design of the meter. However, due to instability in the flowing process velocity of the gas in pipelines is constantly changing and there is a need for compliance with isokinetic, adjust the number of selected gas, and therefore the speed at the tip of the probe flow regulator. Because the counters are not fixed instantaneous flow, it is fast enough to produce a correction is not possible.

- Implementation guide cylinder with grooves for fixing the position of the probe along the section of the pipeline is the reason for low accuracy (±30 mm) positioning and when you consider that the speed of gas flow, at a constant average, is not uniform over the cross section of the pipeline, there is no guarantee compliance with isokinetic.

- Used every counter has a range of nominal gas consumption, which is guaranteed laid the accuracy of its measurement, because the pressure, temperature and gas flow speed in the pipe can be changed on the same mining company in very wide ranges, quite often there is a situation in which compliance with isokinetic have to set the gas flow rate is outside the guaranteed accuracy of measurement used scetchy the A.

Another disadvantage is that the design does not allow for measurements at pressures in the pipeline, exceeding 1.6 MPa, since the filter node with the probe inserted through the lubricator manually by direct application to the stop of the gas outlet pipe of the physical force of the operator's hand, which is limited.

The aim of the present invention is to improve the measurement accuracy by providing isokinetic sampling gas and expanding the range of application of the device according to the pressure in the pipeline.

This goal is achieved by the fact that the device is equipped with a manual gear-cable actuator with spring retainer position of the filter node with the probe section of the pipeline, a linear scale on the guide cylinder, an indicator of the current flow of gas and a set of exchangeable probes with different internal cross-section.

Such a performance meter provides the possibility of its application when the pressure in the pipeline, exceeding 1.6 MPa, to fix the position of the tip in cross section with a precision of one millimeter and maintain the velocity of the gas in the cross section of the probe required to ensure isokinetic sampling.

Schematically the device for measuring the concentration of the liquid droplet in the gas stream are represented on the drawing. It includes a filter unit (1), the removable proposalin the th probe (2), exhaust pipe (3), the guide cylinder with a linear scale (4), the flow regulator (5), the meter (6), rotameter (7), pressure gauge (8), thermometer (9), lubricator (10) and manual subcategory actuator with spring retainer position (11).

For the production of the measuring device is connected with the reservoir (10) through the flange adapter (12) to the valve (13)mounted on the pipeline. Before connecting the filter node is weighed, a measuring instrument for determining the initial distance from the center of the sampling probe to the top section of the pipe and on the basis of the available velocity profile is determined by the point in the cross section of the pipe where the flow velocity is equal to the average gas velocity in the pipeline. After connecting the device, the valve (13) is opened, the probe will be installed to a depth where the flow velocity is equal to the average gas velocity in the pipe, regulator, taking into account the average speed of gas pressure and gas temperature and the square internal cross-section of the probe, the flowmeter is set to the desired flow rate of gas, removed the original counter and are given exposure time required to capture at least 100 mg of liquid. In the process of aging, as necessary, to reflect changes in velocity in the pipeline is the adjustment of the number of sampled gas. PEFC is the shutter speed the flow regulator is closed, filter node rises, the valve is closed. Determines the gain of the filter node and the number of the selected gas at the meter and determine the ratio of the mass amount of fluid per unit volume of gas.

The proposed device has been tested in commercial OJSC "Surgutneftegas" at different pressures in the pipeline in the summer and winter seasons.

Literature

1. Vnwa, Benmarco. "Purification of industrial gases filters". - M.: Chemistry, 1970.

2. Bigliani, Wpimages. "Measurements in dispersed flows". - M.: Energy, 1973.

3. Uphrates and other "gas transport". - M.: Nedra, 1973.

4. Ustrious."Industrial gas cleaning". - M.: Chemistry, 1981.

5. Laeven and other "uniform method of research into the performance of oil and gas separators". - M.: Chemistry, 1981.

6. RD 39-0147103-352-89 "Methodological guide for the study of separator units", Ufa, Vniisptneft, 1989.

Device for measuring the concentration of the liquid droplet in the gas stream containing the filter node of the sampling probe, the inlet sampling gas flow regulator, guide cylinder, the gas meter with pressure gauge and thermometer, characterized in that the device is equipped with a manual gear-cable actuator with spring retainer position of the filter node with the probe, a linear scale on upravlajushemu cylinder, an indicator of the current flow of gas and a set of exchangeable probes with different internal cross-section.



 

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