Sensor for control and signaling about border of interface between mediums petroleum product-water

FIELD: invention refers to control-measuring technique and is assigned for control and signaling about border of interface between mediums petroleum product-water in installations for purification water from petroleum products or watered petroleum products from water.

SUBSTANCE: sensor has flange, three electrodes with sleeves on their low ends filled with fresh water, moreover two of them are covered with dielectric insulation. Electrodes with sleeves are located inside tube of protective screen and are fastened in flange with aid of stuffing boxes-insulators. Screen in upper part has diaphragm ring with openings along circumference coinciding with openings in screen forming swinging compensator and is fastened to flange with aid of screws. Electrodes of sensor together with sleeves and electronic part form oscillating contour going in resonance at presence in space between electrodes of electric conductive medium (water) with following triggering of executive elements and at presence of water between electrodes of petroleum product resonance of contour stops.

EFFECT: increases reliability of work of sensor.

2 cl, 1 dwg

 

The invention relate to measuring technique and is intended for signalling and control the upper and lower position of the boundary line oil-water, the generation of the control signal and its output in the automatic control system oily separator units and in other cases, for example for control of the interface water-air.

Known contact level sensors, the principle of which is based on the electric circuit when the immersion of the electrodes of the sensor in the controlled fluid.

Known monitoring device containing the electrode with glass in the bottom, filled with pure water, the insulator electrode and the second electrode is used the body of the tank, which is controlled oil-water environment (USSR, A.S. No. 1442837, CL G01F 23/24).

Closest to the proposed design is that the device control and signaling the position of the boundary environments oil-water (Eurasian patent №001683 from 28.03.2001,, CL G01F 23/24).

This design contains a flange with gasket-insulator, electrodes with glasses, covered outside insulation, filled with pure water and placed in a protective screen with the diaphragm ring, the cleaning system of electrodes, made in the form of one or more vertical tubes with holes Posey length, the lower end of which is arranged a gear and is mounted on the tapered bumpers-reflector located in the lower end of the tube screen, and the top is connected with the inlet radial passage in the flange, and provided with the permeate valve. The electrodes are made different in length and an upper end fixed by Salnikov-insulators in the flange, and one of the electrodes, which are common and connected to the flange without insulator, provided with an additional glass of clean water, mounted at the level of short glass electrode.

This design has a number of disadvantages, which include:

1. Complexity, bulkiness and poor efficiency of the cleaning system of electrodes from petroleum products, salt deposits, mechanical particle;

2. The permeate valve requires careful fitting and, as a rule, does not provide integrity;

3. When the length of the electrodes under the influence of vibration and pitching distance between the electrodes is changed, which leads to a change of the resistance of the conductive environment and, as a result, false positives device;

4. The glasses are connected with the electrodes by means of a thread and locking washers are used in Grover. In sea water washers are destroyed and glasses vibration spontaneously turned off from the electrodes;

5. General electric is od with two glasses, a relatively complex to manufacture, and the second upper glass is not required;

6. When changing the salinity of the water between the electrodes with glasses varies the amount of current between the electrodes, and this leads to instability of the actuation device;

7. When heated, controlled environment conductivity changes, which leads to false positives.

The purpose of the invention is to improve design, increase reliability and eliminate these shortcomings.

This objective is achieved in that the sensor includes a flange with holes around the perimeter for attachment to the neck of the tank or separator, over which the cover with studs and nuts, three electrodes with glasses, filled with pure water and placed on their lower ends, with a short electrode of the upper level and a long electrode of the lower level is fixed in the flange through Salnikov-insulators, the third common electrode is made of the same length as the electrode lower layer, a protective shield in the form of a short pipe connected to the upper part of the flange, and the electrodes with glasses placed inside of the screen, with the upper part of the diaphragm ring of holes coinciding with the holes on the tube screen, the set can be rotated to change prohodna the cross-section of the holes with the formation of the compensator roll, moreover, the third electrode is also mounted in the flange with gasket-insulator, with a glass electrode and a glass electrode lower layer covered by a dielectric isolation, all the glasses are attached to the electrodes by means of a thread, stopped the nuts and recorded in the screen using one or more spacers of a dielectric material, and on the bottom of the screen set the coarse protective mesh. In addition, electrodes with glasses of clean water together with electronic part form a resonant circuit, which is a resonance in the presence of a conductive medium (water) between the electrodes and leads to disruption of the resonance in the presence of dielectric medium (oil).

The holes of the screen and diaphragm rings provide free transfusion neptunomonas environment and overlap diaphragm ring when it is turned up to 95% of full bore, the screen with holes and diaphragm ring of holes form a compensator false positives during rolling of the ship, while shielding electrodes with glasses from mechanical particles, viscous and sticky oil nodules.

To prevent spontaneous loosening glasses with electrodes vibration provided by locknuts, and to more accurately capture top the th and the lower boundary line of the oil-water glasses top (short electrode) and the lower position (long electrode) covered by a dielectric insulation, and the glass of the overall (long) electrode such coverage has not.

The electrodes in the upper part mounted in the flange with gaskets-insulators, thereby ensuring the integrity and dielectric isolation between the electrodes and the flange.

To prevent oscillations of the electrodes with glasses vibration and rolling of the ship provided by one or more spacers of a dielectric material.

The drawing shows the design of the sensor. The sensor includes a flange 1 with 2 holes around the perimeter for mounting in a vertical position to the neck of the separator or tank, gaskets isolation of the electrodes 3, the diaphragm ring 4 with holes 5, the protective screen 6, which represents the opening at the bottom of the pipe with a protective coarse grid 9, is connected by screws to the upper part of the flange 1, the glasses 10 with a dielectric insulation 11, the electrodes 12, the terminal electrodes 13, a cover 14, a stud with a nut 15. The electrodes 12 of the upper ends are fastened in the flange 1 by means of seals-insulators 3, passing over the flange at the terminals 13, and the lower ends of the electrodes with a thread attached to the cups 10, scopolamine against inadvertent loosening the nuts 7. The glasses 10 of the upper electrodes and the lower levels are covered with dielectric insulation 11, and the glass of the common electrode dielectric isolation is not. With the goals of the firm exception rocking vibration and rolling of the ship electrodes secured by one or more lugs 8. Terminals 13 of the electrodes 12 is protected from foreign objects out of the terminal cover, isderived stud with a nut 15.

In the basis of the sensor based on conductivity of water with the formation together with the electronic part of the resonant oscillating circuit, in the presence of water between the electrodes with glasses.

Does the sensor in the following way. Before you begin the glasses 10 electrodes 12 are filled with clean water, the sensor in a vertical position by means of the flange 1 is fixed on the neck of the separator or tank in which is controlled oil-water environment, and the terminal 13 is supplied with current by a certain chastity and tension.

When filling of the separator or tank neptunomonas environment the lower part of the sensor to flange also filled environment, and subsequent separation of the environment on the water and the oil space between the electrodes 12 with 10 glasses filled it with water, then the oil. In neptunomonas environment in glasses 10 is always clean water, preventing contamination of the inner surface of the Cup and of the electrode in it, and during the ascent phase boundary of the oil-water mirror glasses is released from the oil. When filling in the space between the electrodes 12 to 10 glasses of water in the closed electric circuit, resonant circuit, formed the electrodes and the electronic part of the sensor, is in resonance, the circuit begins to flow the maximum current and triggers the appropriate Executive member. As the lower border razdelila phase oil-water oil covers the mirror glasses 10 (first the top and then the bottom) and the electrical circuit is broken in the LC resonance circuit stops current in electric circuits circuit is reduced to 0 and Vice versa. In the contour variable, basically, is the resistance of the medium between the electrodes with glasses, then decreasing to very low values in the presence of water, then increasing to a very large size (almost indefinitely) in the presence of oil.

During rolling of the ship and placed in its cage or tank sensor lens separated from water, petroleum, seeking to occupy a horizontal position, will be synchronously swing, moving in a vertical plane with a certain amplitude and period, based on the strength of pitching, and the oil in the inner cavity of the screen 6 of the sensor will be synchronous to repeat the process of moving the main lens of the oil moving from the internal or inner cavity of the screen through the holes 5 screen 6 and the diaphragm ring 4, together forming the compensator false positives sensor during rolling of the ship. Compensation of false positives is of Attica during rolling of the ship is due to the throttling of the oil when it is flowing through the adjustable throttle cross section of the holes 5 in the screen 6 and the diaphragm ring 4 at its zablokowana turning and stopping a screw. Turn the diaphragm ring 4, on the basis of the viscosity of the oil, empirically pick is the flow area of the holes 5 that the time of flow of oil from the cavity of the screen 6 of the sensor lenses and Vice versa considerably behind time travel main "lens" of oil in the separator or tank, and the amplitude of fluctuations of oil in the cavity of the screen 6 is considerably less than the amplitude of the "lens" of oil in the separator or tank, which reduces false triggering of the sensor.

The invention provides precise, reliable control of the position of the phase boundary of the oil-water during rolling of the ship to ±45° period 2...9 changing the temperature controlled environment.

1. Sensor monitoring and alarm boundary line oil-water containing flange with holes for fasteners, over which the cover with studs and nuts, three electrodes with glasses, filled with pure water and placed on their lower ends, with a short electrode of the upper level and a long electrode lower levels fixed in the flange through Salnikov-insulators, the third common electrode is made of the same length as the electrode lower layer, a protective shield in the form of a short pipe connected to the upper part of the flange, and electrodes cups placed inside the screen, having in the upper part of the diaphragm ring of holes coinciding with the holes on the tube screen, the set can be rotated to change the bore hole with the formation of the compensator of pitch, wherein the third electrode is also mounted in the flange with gasket-insulator, with a glass electrode and a glass electrode lower layer covered by a dielectric isolation, all the glasses are attached to the electrodes by means of a thread, stopped the nuts and recorded in the screen using one or more spacers of a dielectric material, and on the bottom of the screen set the coarse protective grid.

2. The sensor according to claim 1, characterized in that the electrodes with glasses of clean water together with electronic part form a resonant circuit, which is a resonance in the presence of a conductive medium (water) between the electrodes and leads to disruption of the resonance in the presence of dielectric medium (oil).



 

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