RU2381484C1 - Installation for calibration and gaging of moisture metres - Google Patents

Abstract

FIELD: testing equipment.

SUBSTANCE: invention is related to devices for imitation of crude oil or other fluid mixture flow with specified ratio of components. Installation for calibration and gaging of moisture metres comprises circulation closed circuit, which is arranged of several sections and includes the following components joined by pipeline - section for fluid filling, pump, section for installation of calibrated converted of moisture metre, electric motor, heat exchanger. Installation is fixed in support arranged in the form of vertically oriented stands installed on horizontal platform. Circulation circuit, with the help of connection element installed in section of specified circuit, is fixed on central stand of support with the possibility of rotation in plane, which is perpendicular to specified platform by angle of 90°-100°. One of circuit sections is equipped with two nozzles with valves for filling and/or drain of fluid, besides isolation valves are installed in section of specified section upstream and downstream nozzles.

EFFECT: improved evenness of mixing, reduced error in setting of volume content of non-water fluids components, reduced time required for calibration and gaging of moisture metres.

2 cl, 3 dwg

Description

Technical field

The invention relates to devices for simulating the characteristics of a flow of crude oil or another mixture of non-aqueous liquids with a given ratio of components, for example, the moisture content of crude oil.

A device for simulating the flow of crude oil is required to calibrate the flow meter of the crude oil or to verify it during operation.

State of the art

As a rule, the design of installations for checking moisture meters is a closed pipeline through which a mixture of a given composition is driven by a pump.

The closest analogue of the proposed technical solution is "Installation for verification (calibration) of primary converters of the volume fraction of water and oil" (see the Advertising booklet of CJSC "PIK and KO", Moscow, 2004).

The known installation includes a closed loop, including a pipe-connected section for oil filling, a pump, an installation section of a verifiable moisture meter transducer, an electric motor, and a heat exchanger used to control the temperature of the mixture.

The error in setting the composition of the mixture is directly included in the main error of the hygrometer. For a crude oil moisture meter, acting, for example, on the principle of translucent the mixture flow by electromagnetic waves and determining the volumetric component composition from the indirectly measured dielectric constant of the mixture, the accuracy requirements for setting the mixture composition are very high: for example, for commodity oil moisture meters operating in the range up to 2% humidity, the recommended basic error should not exceed 0.06%, for moisture meters with a working moisture content range of up to 10% - not more than 0.15%, for a highly watered moisture meter, work in the range up to 100% humidity, - not more than 1.5%.

For accurate calibration of the moisture meter, the specification of the moisture content of crude oil should be of the order of 0.02%, 0.05% and 0.5%, respectively, which in the stand of average volume - 15 l - requires setting the relative volume of moisture inside the working volume of the stand, respectively, with the maximum permissible deviation 3 g, 7.5 g, 75 g, and in order to ensure the accuracy of the dynamic test bench, its working volume often has to be made large enough (for example, to enable the calibration of the moisture meter in the field for a working volume of about 100 l of the device, the installation is placed on car trailer, which creates certain difficulties).

Another difficulty in providing an accurate specification of the volumetric moisture content in the liquid to be driven is the requirement for good mixing of the mixture. It is set by limiting the minimum speed or flow rate, ensuring its turbulence. Nevertheless, even with turbulent flow, accuracy is limited by the presence of zones in which the predominant accumulation of heavy or light components of the mixture in the annular pipeline of the installation is possible.

In the known solution, zones in which a predominant accumulation of heavy or light components of the mixture (gas, water, oil) is possible, can be technologically caused by the connecting pipe of valve 16, the space between the drain valve 19 and pump 10, the zones under the valve 18 and the section for oil filling 12 (see figure 1). To meet the high requirements for the accuracy of setting the volumetric moisture content of the mixture, in the known device it is necessary, for example, to blow the annular pipe with hot air before pouring it to eliminate moisture on the walls and in areas in which the predominant accumulation of heavy or light components of the mixture, which is extremely difficult and slows down the calibration process, and you have to completely change the whole mixture. However, this does not guarantee against violation of the uniformity of mixing and an increase in the error of the task due to the accumulation in these zones of predominantly any fractions during the flow of the mixture.

Disclosure of invention

The objective of the present invention is to improve the accuracy of setting the volumetric content of the components of non-aqueous liquids, as well as improving ease of use and reducing the time for calibration and calibration of moisture meters.

The technical result of the invention is to increase the uniformity of mixing and significantly reduce the error in setting the volumetric moisture content in the liquid to be driven by eliminating the influence of zones in which the predominant accumulation of heavy or light components of the mixture is possible.

The specified technical result is achieved by the fact that the installation for calibration and calibration of moisture meters, containing a closed loop made of several sections and including a pipe-connected section for liquid inlet, a pump, the installation section of a verified moisture meter transducer, an electric motor, a heat exchanger, is fixed on a support according to the invention, made in the form of vertically oriented racks mounted on a horizontal platform, a circulation circuit using a connecting element The one installed in the section of the mentioned circuit is mounted on the central support column with the possibility of rotation in the plane perpendicular to the indicated platform at an angle of 90 ° -100 °, one of the sections of the circuit is equipped with two nozzles with valves for filling and / or draining the liquid, and section of the specified section before and after the nozzles are installed shut-off valves.

According to one embodiment of the invention, one of the sections of the closed loop can be branched, while the branches are parallel to each other and lie preferably in a horizontal plane.

In a preferred embodiment of the invention, the struts of the support may be provided with softening pads.

Fixing the proposed installation on a support made in the form of vertically oriented racks installed on a horizontal platform, fixing the circulation circuit using a connecting element mounted on a section of the said circuit on the central support column with the possibility of rotation in a plane perpendicular to the specified platform at an angle of 90 ° - 100 °, provides an increase in the uniformity of mixing of the liquid being driven by returning the settled components of the mixture to the stream and, therefore, increasing t accuracy reference components volume content of non-aqueous liquids.

This is achieved by freeing up zones in which the predominant accumulation of heavy or light components of the mixture (dead zones) is possible without interrupting the calibration process of the moisture meter. It is advisable to place the axis of rotation near the center of gravity of the contour so that the contour can be easily rotated around the axis. Components accumulated in the "dead zones" when the circuit is rotated through an angle of 90 ° -100 ° go out from the places of accumulation and mix, which ensures a more accurate setting of the concentration of the components.

It is important to note that although the “dead zones” are freed when the circuit is rotated, others appear, but the accumulation of components in the “dead zones” occurs mainly when filling and sealing the circuit (closing the filler holes). During the measurement with an automatic moisture meter (about 1 second), the predominant accumulation in the component zones is negligible, especially since periodic contouring of the circuit with the moisture meter around the axis during calibration is possible with the accumulation of a statistically significant average value of the series of measurements obtained.

The supply of one of the sections of the circuit with two nozzles with valves for filling and / or draining the liquid and shut-off valves installed before and after the nozzles, provides conditions for increasing the accuracy of setting the volumetric content of components of non-aqueous liquids.

Such a node actually acts as a dispenser. It allows you to drain the mixture from the cut branch section. If necessary, it is possible to flush the section and replace the mixture with an equivalent amount of the component, the amount of which in the mixture is desirable to increase. In this case, a strictly calculated, pre-calibrated volume is replaced.

For example, if in a two-component oil-water mixture before the substitution, the water concentration in the dispenser and stand was

where K _in - the concentration of water;

About _in - the volume of water in the "dispenser";

O _s - the full volume of the "dispenser" (replaceable volume);

About _vs - the volume of water in the circulation circuit;

About _with - the full volume of the circulation circuit;

then after replacing with water and mixing the water in the "dispenser" will become

On _{a newly} = O + O _{of (1-K),}

and a new concentration of water will become

K _vn = O _vnov / O _k ,

where K _again - a new concentration of water.

The substitution accuracy is achieved by accurately determining the amount of substitution limited by the internal surfaces of the shut-off valves relative to the section being cut off (after they are opened again, the volume of the mixture inside the valve channel is returned to the flow), as well as by easier blowing and drying of the replaced volume.

The execution of one of the branched section sections and branches parallel to each other in the horizontal plane (in Fig. 2 they are shown in the vertical plane) allows the mixture to be drained from the cut branch of the section without stopping the mixture sweeping along the circuit, which in turn reduces the calibration time and calibration of moisture meters.

The list of drawings:

figure 1 shows a General view of the installation;

figure 2 shows a General view of the installation with a branched section;

figure 3 shows a side view of the installation.

The installation contains a closed loop, including a pipe-connected section for filling liquids 1, a pump 2, mounted on the lower section of the circuit, a moisture meter installation section 3, a heat exchanger 4, a support 5 containing vertically oriented peripheral racks 6 and 8 and a central rack 7 located on horizontal platform with the ability to rotate the circuit at an angle of 90 ° -100 °, a connecting element 9 mounted on a section of the circulation circuit, the axis of rotation 10 of the specified fastening element, branched sec AI 11 and 12 of the circuit, the first shut-off valve 13 of the branched section of the circuit, the first valve 14 for filling and draining the fluid from the branched section of the circuit, the second shut-off valve 15 of the branched section of the circuit, the second valve 16 for filling and draining of liquid from the branched section of the circuit, valve for air (gas) outlet 17 and valve 18 for filling and draining the entire circuit fluid, softening pads 19 mounted on peripheral vertically oriented racks and designed to absorb the contour contact with systems, additional valves 20 and 21, designed to drain and fill the fluid of the entire circuit, located on the lower section of the circulation circuit.

The implementation of the invention

The relatively small weight of the proposed device allows you to calibrate a moisture meter (it is mounted instead of the connecting section 3) at the field reference points of formation water and the density of the oil produced, as well as due to the proposed device to obtain an intermediate value of the measurement parameters with a given moisture content with acceptable accuracy of the composition of the mixture flow. The moisture meter allows measuring the moisture content in the oil-water mixture flow to determine, by an indirect method, the amount of oil produced.

Setting the composition of the mixture using the proposed installation for calibration and calibration of moisture meters is as follows.

To obtain a given concentration of oil-water mixture in a clean and dry looped circulation circuit with the help of measuring dishes in the area for the filling of oil and water 1 pour water and oil in the desired proportion.

The volume of the circulating closed circuit O _c (closed circulating system, including a moisture meter, fixed in the area 3 of the circuit) must be determined and known in advance. To this end, the circulation circuit is filled with water, possible air bubbles are released with a slight tilt around the rotary axis 10 in one or the other direction with the valve for the release of air (gas) 17 and the first valve 14 open, supplement with water and block them. Turn the circuit at an angle of 90 ° -100 °, draining the water from the tank above the closed first valve 14, or suck it with a syringe.

Open the valve for the release of air (gas) 17, and then open the valve 18 and drain the water into the vessel, thereby freeing up the areas of the second valve 16 and the additional valve 21, where water could accumulate, and then measure the volume of the circuit.

In a similar way, the volume of a part of a branched section of a closed loop O _{s is} determined, i.e. the volume of the mixture determined by the shutoff valves 13 and 15 and to be replaced to change the set concentration.

Fill the necessary volumes of water and oil (for example, to obtain a test concentration of 40% of oil by volume, it is necessary to pour 0.6 О _from water and 0.4 О _from oil into the system), after sealing the installation (closing all filling holes and air outlet) include pump 2 and the mixture moves until a uniform emulsion is obtained. The mixing time is determined experimentally, it depends, in particular, on the power of the pump 2, driving the mixture. At the same time, in areas in which the predominant accumulation of the heavy or light components of the mixture in the “dead zones” is possible, over the drain and fill valves 20 and 21, for example, water is delayed (these valves are necessary, since removing the entire mixture from the circuit through one valve 18 is not possible due to the fact that it may not pass through the pump 2). When turning around the axis 10 by an angle of more than 90 °, water from them merges into the flow of the circuit, and further, the uniformity of the mixture mixing can be maintained by swinging a closed circular circuit with a moisture meter, fixed in section 3 between its extreme positions, so that the water or light fraction does not have time to stagnate.

If the volume of the circulation circuit with a moisture meter installed on the site is 3-4 l, and the volume of the branched part of the installation circuit is 0.5 l, then to switch from a concentration of 40% to a concentration of 41%, the concentration of oil in the mixture poured into the branched part of the installation circuit (dispenser), should be 48%, and when replacing the mixture in the branched part of the installation circuit (dispenser) with pure oil, the concentration will be 47.5%.

After replacing the volume of the branched part of the installation circuit, it is necessary to mix the mixture with the drain settling in areas in which the predominant accumulation of heavy or light components of the mixture in the "dead zones" is possible. For this, the system is again sealed, the pump 2 is turned on and the mixture is mixed. In areas in which the predominant accumulation of heavy or light components of the mixture in the "dead zones" above the drain and fill valves 18 and 21, for example, water is delayed. When turning around the axis 10 through an angle of 90 ° -100 °, the water merges from them, and further, the uniformity of the mixture mixing can be maintained by swinging a closed circulation loop with a moisture meter fixed in section 3 between its extreme positions so that water or light components do not have time to settle.

Then, during the calibration process, it is recorded which values of the readings of the moisture meter installed in section 3 of the circuit correspond to a given concentration of the oil-water mixture circulating in the installation for calibration, calibration and washing of moisture meters.

The proposed technical solution improves the accuracy of setting the volumetric content of the components of non-aqueous liquids, as well as improving the ease of use and reducing the time for calibration and calibration of moisture meters.

Claims (2)

1. Installation for calibration and calibration of moisture meters, containing a closed loop made of several sections and including a pipe-connected section for liquid inlet, a pump, a section for installing a moisture meter transducer under verification, an electric motor, and a heat exchanger, characterized in that it is mounted on a support made in in the form of vertically oriented racks installed on a horizontal platform, a circulation circuit using a connecting element installed on the site of the mentioned circuit RA, mounted on a central support pillar with the possibility of rotation in a plane perpendicular to the specified platform, at an angle of 90-100 °, one of the sections of the circuit is equipped with two nozzles with valves for filling and / or draining the liquid, and in the area of the specified section before and after the nozzles shut-off valves installed. 2. Installation according to claim 1, characterized in that one of the sections of the closed loop is branched, while the branches are parallel to each other and lie preferably in a horizontal plane.

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