RU2135985C1 - Production-line meter of moisture content of oil products - Google Patents

Abstract

FIELD: oil industry. SUBSTANCE: production-line meter of moisture content of oil products has primary converter connected to measurement unit and fitted with flow sampler with inlet and outlet branch pipes installed correspondingly in high-pressure pipe downstream from emulsifier and low-pressure pipe-line. Flow sampler is manufactured in the form of barrel with side hole where coaxial capacitive primary converter is located which working surface bulges out above side surface of flow sampler that has ventilation system for blow-through and sample taking. Coaxial capacitive primary converter is manufactured in the form of quartz washer and cylindrical body with flange having external thread and annular groove in working surface. Its space houses central conductor. Quartz washer is located in groove of body between its internal surface and external surface of working lug of central conductor. Side hole of sampler has thread. EFFECT: increased authenticity, accuracy and stability of information from meter thanks to reduced effect of walls of pipe-lines, water " lenses " and oil products clung to elements of primary converter on measurement result, localization of test zone. 2 cl, 3 dwg

Description

 The invention relates to the field of measuring equipment and can be used to determine the moisture content of oil products, in particular heating oil, directly in the process of their production or use, as well as to control their moisture content.

 A moisture meter of dielectric materials is known, which contains a serially connected microwave generator, a first attenuator and a power divider, a transmitting antenna is connected to one of the outputs, and a second attenuator, a phase shifter and a power combiner, the output of which is connected to the first input through a first detector recorder, as well as serially connected receiving antenna and power limiter. Between the power limiter and the adder, a directional coupler is connected, connected in series with the second generator, a DC amplifier and a double comparator, the output of which is connected to the second input of the recorder (A.S. N 1769098, G 01 N 22/04, 1989). The device’s antennas form its primary converter, and other elements form the measuring unit.

 However, despite the complexity of the measuring circuit, the known moisture meter has a limited measurement range. In addition, it is practically unsuitable for controlling the humidity of oil products in pipelines due to the influence of the conductive walls of the latter, blurring of the control zone, disturbances introduced by water “lenses” present in the controlled medium, and sticking of viscous oil products to the receiving and transmitting antennas.

 Closest to the proposed one is a flow meter for measuring the moisture content of oil products, containing a primary transducer connected to a measuring unit and equipped with a flow sampler with an inlet pipe and an outlet pipe placed in a low pressure pipe (see EP 0496144, G 01 N 22/04, 1992 )

 However, this meter is also characterized by the aforementioned disadvantages: low accuracy and reliability of the measurement data, instability of readings due to blurred control zone, disturbances introduced by water “lenses” present in the controlled medium, and sticking of viscous oil products to the sensitive element.

 The technical result expected from the use of the invention is to increase the reliability, accuracy and stability of the output information of the meter by reducing the influence of the walls of pipelines, water "lenses" and adhering to the elements of the primary converter of oil products on the measurement result, localization of the control zone.

 This result is achieved by the fact that the flow meter of moisture of oil products containing a primary transducer connected to the measuring unit and equipped with a flow sampler with an inlet pipe and an outlet pipe located in the low pressure pipe is equipped with an emulsifier, the flow sampler is made in the form of a glass with a side opening, in which contains a coaxial capacitive primary transducer, the working surface of which protrudes above the lateral surface of the flow sample rnika which is configured as a gate system purging and sampling, the inlet flow probe placed in the high pressure conduit after the emulsifier.

 In addition, the coaxial capacitive primary Converter can be made in the form of a quartz washer and a cylindrical body with a flange, an external thread and a groove on the working surface, in the cavity of which the central conductor is placed, while the quartz washer is located in the groove of the housing between its inner surface and the outer surface the working tip of the central conductor, and the side hole of the sampler is threaded.

 In this case, the measuring unit can be made in the form of a series-connected reference oscillator, matching transformer and balanced frequency detector with a reference transducer and a measuring coaxial capacitive primary transducer included in the arms of the bridge circuit, and output regulators of zero and sensitivity characteristics.

 In FIG. 1 shows a flowmeter moisture meter. In FIG. 2 shows a section through a coaxial capacitive primary transducer, and FIG. 3 is a block diagram of a measuring unit.

 The device is installed in the pipeline or line 1 and contains an emulsifier (mixer mainly hydrodynamic cavitation) 2, installed after the pump 3 in the line 1 'high pressure. A pressure gauge 4 is connected as shown in FIG. 1, to a purge and sampling system (in particular, valves 6–9 belong to it) to control the operating pressure. The specified system ensures the flow of the controlled medium (fuel oil) into the flowing cylindrical sampler 10, its purging with steam, the bypass of the sampler 10 and the discharge of fuel oil into the low pressure line 1.

 The sampler 10 is made with a side hole 11 in which the primary coaxial capacitive primary transducer 12 (hereinafter transducer 12) is placed, connected to the measuring unit 13. The output of the latter can be connected to the input of the regulator 14, which controls the operation of the control shut-off valve 15. The inlet and outlet nozzles the sampler 10 is indicated in FIG. 1 positions 16 and 17, respectively.

 The transducer 12 (Fig. 2) is formed by a conductive housing 18 with a flange 19, in the cavity of which a central conductor 20 is placed, the working tip 21 of which is separated from the housing 18 by a quartz washer 22 located in the groove 23 of the housing 18.

 Block 13 (Fig. 3) is formed in series by a reference oscillator 24, a matching transformer 25 and a balanced frequency detector 26 with a reference transducer (capacitive sensor) 27 and a measuring transducer 12. The transducers 12 and 27 are included in the arms of a bridge circuit or detector 26 made in the form of a capacitive bridge or a bridge circuit with output regulators of zero and sensitivity - resistors 28, 29 (such a detector is a conventional capacitive bridge with output regulating resistors). Of course, any known capacitance measuring unit can be used as a measuring unit, and any known differential frequency detector as a detector 26, however, the use of a bridge detector 26 with output zero and sensitivity controllers (resistors 28, 29) is preferable. The transducer 12 during the measurement process is immersed in the measured medium (fuel oil). Variable resistors 28 and 29 provide zero adjustment of the scale and sensitivity of the measuring device 30, the scale of which is calibrated as a percentage of moisture content in the controlled environment.

 Reference numerals 31-33 in FIG. 1 also indicates valves related to the purge and sampling system. Valves 5-9, 31-33 of this system can be made with either manual or automatic control.

 The device can be used emulsifier 2 systems for the preparation of a water-oil fuel emulsion. Such systems are usually installed in fuel oil farms in order to obtain a stable emulsion from fuel, which makes it possible to dispose of commercial water, eliminates water "lenses" from the nozzles of boiler units, and helps to reduce harmful emissions into the atmosphere. The algorithm of operation of the regulator 14 is determined in this case by the specified water content V in the fuel: the output signal U of the regulator 14 is equal to the difference V-T, where T is the output signal of the unit 13 equal to the current moisture content in the fuel oil.

 The device operates as follows. In operating mode, fuel oil from line 1 is pumped by pump 3 into line 1 '. Emulsified fuel from the outlet of the emulsifier 2 through the pipe 16 and the open valves 6, 32 enters the sampler 10, from where it flows through the valve 9 into the line 1. Valves 5, 7, 8, 33 and 31 are closed. When wet fuel oil passes through the cavity of the sampler 10, the capacitance of the transducer 12 changes. As a result, the bridge circuit of the detector 26 is unbalanced and the operator can count down on the scale of the device 30. The signal from the output of block 13 can also be supplied through the regulator 14 to the control input of the valve 15, which regulates the supply of water to the highway 1 so that its total amount is equal to the set value.

 At the same time, the operator records the readings of manometer 4: the presence of pressure at the inlet of the sampler 10 means that the readings of the moisture meter are true, since there is fuel oil in line 1 and, therefore, sampler 10 and it is moving.

 By opening valve 7, the operator is able to take a control sample of fuel oil at the inlet of sampler 10. Valve 8 allows directing fuel oil past sampler 10, and by opening valves 5, 8 and 31 and closing valves 6, 9, 32, 33, the operator is able to blow corresponding steam sections of the pipeline.

 The design of the meter provides control of the moisture content of oil products in a wide range, and also eliminates unreliable readings due to the ingress of large inclusions of water on the sensor, sticking of “plugs” of oil products, and the absence of consumption of a controlled environment. Moreover, the high accuracy of the readings is ensured by the location of the coaxial sensor in the flow of the controlled medium and at a distance from the conductive walls. At the same time, the proposed meter is simple and reliable in operation.

Claims (3)

 1. A flow meter for measuring moisture of oil products containing a primary converter connected to a measuring unit and equipped with a flow sampler with an inlet pipe and an outlet pipe placed in a low pressure pipe, characterized in that it is equipped with an emulsifier, the flow sampler is made in the form of a glass with a side opening, in which a coaxial capacitive primary transducer is located, the working surface of which protrudes above the lateral surface of the flowing sampler, which also made with a valve purge and sampling system, while the inlet pipe of the flowing sampler is placed in the high pressure pipe after the emulsifier.  2. The meter according to claim 1, characterized in that the coaxial capacitive primary transducer is made in the form of a quartz washer and a cylindrical body with a flange, an external thread and a groove on the working surface, in the cavity of which a central conductor is placed, while the quartz washer is located in the groove of the housing between its inner surface and the outer surface of the working tip of the Central conductor, and the side hole of the sampler is threaded.  3. The meter according to claim 1, characterized in that the measuring unit is made in the form of a series-connected reference generator, matching transformer and balanced frequency detector with a reference transducer and a measuring coaxial capacitive primary transducer included in the arms of the bridge circuit, and output zero and sensitivity controls characteristics.

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