RU2035701C1 - System for measuring operating parameters of tank - Google Patents

Abstract

FIELD: measuring equipment. SUBSTANCE: system has motor, drum, and meter of drum speed, which are mounted on the common shaft, and container coupled with the drum through a rope. The rope is wound on the drum using the motor. The container is provided with switch and conductivity pickup. The base has openings. The system has strings secured at the top and bottom. The strings serve as guides for moving the container and a float. The container is connected to motor control unit and control desk through a cable. EFFECT: improved accuracy of measurements. 2 dwg

Description

 The invention relates to instrumentation, and more specifically to oil level meters, oil-water phase separation and other technological parameters, such as temperature, water cut, etc.

 Known level gauge [1] containing fixed on the guide floats with built-in level gauges and oil-water interfaces. The disadvantage of this level gauge is the low accuracy of measurements due to the fact that in real conditions there is no clear interface between the two media.

 Known level gauge [2] designed to measure the boundaries of the two media, based on measuring the reaction of the spring force and buoyancy force. The disadvantage of this level gauge is the complexity of the design, low reliability and low measurement accuracy.

 A prototype of the invention is a level meter for a two-stage liquid [3] However, using this device it is impossible to determine the interface between two liquid media with high accuracy, since in real conditions it is impossible to achieve a stable cargo position, along which a signal is given about the interface between two media.

 The aim of the invention is to improve the accuracy of measurements.

 The goal is achieved due to the fact that the device containing the load suspended on a cable mounted on a drum connected to the drive, and the rev counter, the drive and the counter are connected to the engine control unit, guiding strings fixed between the top and bottom are inserted, between which are placed a float with the ability to move along them, the cargo is made in the form of a container with water-cut and temperature sensors, an oil level limit switch is installed on the upper surface of the container, and the sensor is carried out on the lower surface ti, all sensors are connected by electric cable to the motor control unit, and the float is formed with a hole for the cable and mounted above the container.

 Figure 1 presents the design of the system; figure 2 is a block diagram of a system.

The system comprises an engine 1, a counter 2 of the number of revolutions of the drum, a drum 3 that are mounted on one shaft 4, a container 5, which is connected by a cable 6 to the drum 3, on which it is wound using the engine 1, the container 5 is equipped with an oil level limit switch 7, a conductivity sensor 8, a water cut sensor 9, and a temperature sensor 10. The engine 1, the counter 2 and the drum 3 are installed on the base 11, which is made with holes 12-14. Guide holes 15 pass through the holes 12 and are fixed from above and below. The container 5 and the float 16 go up and down the strings. The latter is made with holes 17 and 18 for the guiding strings and the cable 6. The container 5 is connected by an electric cable 19 through the hole 14 in the base 1 with an engine control unit 20 and a secondary device with a panel 21. The limit switch 7 of the oil level h _n is a reed switch mounted above the center of the top cover of the container 5, which closes when the mouth of the permanent magnet the float 16 inserted in the hole 18. The conductivity sensor 8 is an electrode located in a vessel with water, when the phase separation level is moved by moving the electrode (vessel) from the inverse emulsion water to oil to direct oil in water, the medium conductivity sharply increases, which is recorded sensor.

 The system is designed to measure and determine the following technological parameters of the reservoir: oil level (uplift); oil-water phase separation level; temperature along the height of the tank; water cut of oil along the height of the tank; average water cut of oil, enclosed in volume from the selected height to the spill; the amount of "dry" oil in this volume.

 The system can operate in various modes (mode selection is made by a switch on the front panel of the secondary device).

 The container moves cyclically up and down from the phase separation level to the oil level. In this case, level measurement takes place, as well as measurement and recording in memory of temperature and water cut in height.

 When filling the tank or draining oil, it is necessary to monitor the oil level. To do this, by pressing the "Enter", "M", "See" buttons under the "Oil level" indicator, the tracking level is set and when it is reached, a light and sound alarm is triggered.

 The "Water Level" mode is similar to the previous one; the level of the phase-oil-water interface is monitored when water is drained from the tank. The setting is entered by pressing the buttons under the "Water Level" indicators.

 Manual control mode - for carrying out diagnostic, preventive and emergency operations.

 Water cut sensor 9 is a flow-through capacitive converter, the capacitance of which changes with a change in the dielectric constant of the medium filling the space between the plates, which makes it possible to determine the water content in oil. Temperature sensor 10 thermoelectric resistance converter.

 The engine control unit 20 comprises a starter and a transceiver unit (PPV). PPV periodically (for example, once per second) transmits a signal to the secondary device, consisting of the state signals of the conductivity sensors and the limit switch of the oil level and the measuring signals of the temperature sensors, water cut and the number of revolutions of the motor shaft. The response received by the PPB from the secondary device contains signals to turn on the engine in one direction or another.

 When the conductivity sensor or limit switch "Oil Level" is triggered, the starter stops the engine and, after the response of the secondary device, turns it on in the right direction.

 The principle of the system.

 The system is controlled by setting the switches of the panel 21 to the desired position and setting the tracking levels on the front panel of the secondary device.

 Equipment and apparatus installed on the tank operate in automatic mode and do not require constant monitoring.

 The exchange of information and commands between the reservoir and the operator room is carried out via the telemechanics channel, which increases the reliability and stability of the system to external interference.

 Since the operation of the system in different modes differs only in the logic of signal processing, and the control is based on the operation of the limit switch and the conductivity sensor, we consider the operation of the system in the "Levels" mode.

 Let the engine 1 moves the container 5 on the cable 6 along the guide strings 15 down. At the same time, after a predetermined interval, for example, every 0.5 m, the temperature and water cut of the oil are recorded in the memory.

As soon as the conductivity sensor 8 is triggered, the engine stops, a trip signal h _в and a counter 2 of the shaft speed are received in the secondary device, after which the water level digital indicators on the front panel show the measured value, engine 1 starts to rotate in the opposite direction.

After a specified interval, water cut and temperature measurements are updated in the memory until the limit switch 7 h _{n trips} . Engine 1 stops, the trip signal h _{n is} processed by the microprocessor, digital indicators "Oil level" show the measured values of the tide. After this, the container begins to move down, the cycle repeats. Switching the “Parameter-levels” toggle switch on the front panel 21 of the secondary device to the “Parameters” position puts the microprocessor in the mode when the upper digital indicators show the value of the selected parameter (by pressing the corresponding button) and the lower tank height for which the parameter is defined. Change the height by pressing the buttons under these indicators. To calculate the parameters, the calibration curves of the reservoir V (t), the moisture meter φ (s), and the temperature transducer T (u) are located in the device memory. According to the signals of the oil water cut and temperature sensors, the microprocessor calculates and writes into the RAM the values of the water cut and temperature at the height at which the container is at that time. Thus, after moving the container from the oil level to the oil-water interface, the curves of the distribution of water cut and temperature along the height φ (h) and T (h) are stored in the memory.

 The water cut and temperature values shown on the digital indicators are determined by interpolation of these curves. The average water cut of oil in the volume from the selected height to the inflow is determined as the arithmetic average of the water cut in this range, and the amount of “dry” oil is calculated from the average water cut found and the volume found by interpolation of the tank calibration curve.

Claims (1)

 SYSTEM FOR MEASURING TECHNOLOGICAL PARAMETERS OF A RESERVOIR containing a load suspended on a cable fixed to a drum connected to the drive and a speed counter, while the drive and speed counter are connected to the engine control unit, characterized in that the system is provided with fastened top and bottom guiding strings between which the float is placed with the ability to move along them, the cargo is made in the form of a container with water and temperature sensors, and is installed on the upper surface of the container to a final oil level switch, and a conductivity sensor on the bottom surface, while all the sensors are connected by an electric cable to the engine control unit, and the float is made with a cable hole and mounted above the container.

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