Device to determine phase condition of gas and liquid flow

FIELD: measurement equipment.

SUBSTANCE: substance consists in availability of a measurement device and a thermoresistive sensor of phase condition in a device for determination of phase condition of a gas and liquid flow, and the sensor comprises a printed circuit board arranged along the axis of flow movement and rigidly fixed by one short side with a sensitive element installed on it and made in the form of a substrate, on which a film resistor of the "point" design (a thermistor) is installed. The sensitive element is installed in the reference point along the vertical axis of the pipeline cross section and is connected with the measurement device, which comprises a metering circuit and a microcontroller with program control and is designed to measure variation of thermistor resistance, connected with variation of the phase condition of the medium in horizontal layers of the gas and liquid flow, and signal processing. At the same time the sensitive element of the sensor by one short side of the substrate is fixed on the edge of the short non-fixed side of the printed circuit board. The film resistor (thermistor) placed on the substrate is displaced towards the edge of the free short side of the substrate and is arranged at the distance of not more than 0.5 mm from this edge. Contact sites designed for connection of the substrate to the printed circuit board are arranged opposite to the thermistor at the opposite short side of the substrate.

EFFECT: higher efficiency of a device to determine phase condition of a gas and liquid flow.

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The invention relates to measuring technique and can be used to determine the phase state of gas-liquid flow in the control point of the vertical section of the pipeline.

Known devices for determining the phase state of gas-liquid flow (determine the flow regime of the stream, its continuity, depending on the volume of gas content in liquid) (inventor's certificate SU 440585 A1, 25.08.1974; patents: EN 2001391 C1, 15.10.1993; EN 2037811 C1, 19.06.1995; EN 2108567 C1, 10.04.1998; EN 2395801 C2, 27.07.2010; EN 2014568 C1, 15.06.1994; US 6314373 BA, 06.11.2001; US 6655221 BA, 02.12.2003; JP 3455634 B2 9138211 And 27/05/1997; EP 0510774 A2, 28.10.1992; WO 2010071447 A1, 24.06.2010).

A device for determining the flow regime of the gas-liquid flow (patent RU 2390766 C1, G01N 27/22), which measure characteristics of gas-liquid flow in vertical section of the pipeline. The device includes a secondary device and the measuring head inside of plate electrodes connected to the measuring Board, measuring values of the dielectric constant flow. In the presence of air bubbles dielectric constant of the mixture liquid-gas decreases in proportion to the volumetric content of the air in the liquid. Passing through the corresponding layer of the electrodes, this mixture causes a change in capacitance between the plates of the electrodes, elicina which is measured in digital form is transmitted to the secondary device.

Proposed patent RU 2390766 C1 instrumentation has considerable weight and dimensions, as this device is a rather complex structure with a large number of volume elements. The device itself affects the environment settings, its continuity and flow regime, which affects the measurement results and reduces the speed of structure determination of gas-liquid flow.

Known devices closest to the claimed technical solution is a device protected by the patent for the invention "method for determining the phase state of gas-liquid flow and device for its implementation" (EN 2445611 C1, publ. 20.03.2012, IPC G01N 27/00).

In one of the embodiments of the device for determining the phase state of gas-liquid stream contains a measuring device and a sensor with a sensor element located at the cross section of the pipe and connected with the measuring device. The sensor is thermoresistive sensor phase state and contains located along the axis of flow is rigidly fixed to the circuit Board with a hole, on which is installed the sensor element made in the form of a substrate on which is placed a film resistor (thermistor) in the "point" of the performance, while the sensing element is installed the control point on the vertical axis of the pipe cross section. The measuring device comprises a measuring circuit and a microcontroller with software control and is designed to measure changes in resistance of thermistor associated with the phase change medium gas-liquid flow, and signal processing.

In the known device printed circuit Board with a hole, above which is the substrate with thermistor reduces the rate of gas-liquid flow and promotes the formation of vortex flow around the sensor element, which affects the rate of change of the resistance of thermistor sensor phase state and lowers the operating speed of the device.

The specified device according to patent RU 2445611 C1 is taken as a prototype.

The aim of the invention is to improve the performance of your device to determine the phase state of gas-liquid flow.

This objective is achieved in that the device for determining the phase state of gas-liquid flow, comprising a measuring device and thermoresistive sensor phase state, including located along the axis of flow and is rigidly fixed to one short side of the circuit Board installed therein the sensor element made in the form of a substrate on which is placed a film resistor (thermistor) in the "point" of the performance, while the sensing element is installed at a control point on the vertical axis of the pipe cross section and is connected with the measuring device, which contains the measuring circuit and a microcontroller with software control and is designed to measure changes in resistance of thermistor associated with the phase change medium in a horizontal layer of gas-liquid flow, and signal processing, sensor element of one short side of the substrate mounted on the edge of the short loose side of the PCB, film resistor (thermistor), placed on the substrate, shifted to the edge of the free short side of the substrate and located at a distance of not more than 0.5 mm from the edge, with pads that are designed to attach the substrate to a printed circuit Board made in front of thermistor at the opposite short side of the substrate.

In the proposed design, the PCB does not reduce the rate of gas-liquid flow, since it is located above or below the sensing element, which is one short side of the substrate mounted on the edge of the short loose side of the printed circuit Board and installed in the flow, for example, on the Central axis of the pipeline. The substrate with a film resistor (thermistor) instantly enveloped in a liquid or dried gas flow, which increases the operating speed of the device and can detect the presence of gas bubbles in a liquid stream.

From the us the device measurement thermistor sensing element of the sensor phase state is supplied heating current. As a result of heating the temperature of thermistor above the ambient temperature. The temperature rise of thermistor provides increased sensitivity and performance of the device. When shifting film resistor (thermistor), placed on the substrate to the edge of the free short side of the substrate and its location at a distance of not more than 0.5 mm from the edge, reduced heat dissipation on the surface of the substrate, resulting in improved performance of the device at the limit of the heating current.

The offset of thermistor to the free edge of the short side of the substrate is realized due to the fact that the pads are designed to attach the substrate to a printed circuit Board made in front of thermistor at the opposite short side of the substrate.

The invention is illustrated by drawings, diagrams and schedules:

Figure 1 - structural diagram of the device for determining the phase state of gas-liquid flow;

Figure 2 - sensor phase state;

Figure 3 is a topological drawing of the substrate with thermistor;

4 is a sensitive element mounted on the circuit Board;

5 is a waveform change of the signal from the sensor when changing the phase state of gas-liquid flow.

Device for determining the phase state of gas-liquid flow (figure 1)contains the sensor phase state 1 and the measuring device 2. In the measuring device includes:

diagram of measurement (SI) 3, consisting of the elements of a balanced bridge, one leg of which connects the sensing element (thermistor) 11 (numbering SE figure 2) sensor phase state 1;

- managed the DC voltage source (UIPN) 4 for supplying power to thermistor sensing elements 11 of the sensor phase state 1;

- operational amplifier (op-amp) 5, designed to amplify the signal coming from the measuring circuit 3;

- microcontroller with program management 6, connecting the output of the measuring circuit to the analog-to-digital Converter (ADC), digital filtering of the measured signals, the formation of a code sequence of digital signals that determine the state of the sensing element 11, that is, the phase state of the environment in which it is located, the control constant voltage source 4 is supplied to the sensing element;

driver signals interface 7 which enables the reception of signals from the microcontroller 6 and the transmission of signals about the state of the sensing element 11 through the interface, such as RS485, to the information input of the system indication and control 8;

the source of stabilized voltage 9, intended for the formation of the supply voltages for the elements of the s schema.

Posted in the pipeline sensor phase state 1 (figure 2) contains the circuit Board 10, which is located along the axis of motion of gas-liquid flow and is rigidly fixed to one short edge. On the circuit Board 10 is placed sensitive element 11 made in the form of a thin insulating substrate 12 (3) of a width not exceeding 2 mm and a thickness of not more than 100 μm, on which is placed a film resistor (thermistor) 13 made in "point design with dimensions of area not more than 0.04 mm2. The sensing element 11 is set at a control point on the vertical axis of the pipe cross section (for example, on the Central axis of the pipe) (figure 2) and one short side of the substrate 12 is fixed on the edge of the short loose side of the printed circuit Board 10 (figure 4). Film resistor (thermistor) 13 placed on the substrate 12, is shifted to the edge of the free short side of the substrate 12 and located at a distance of not more than 0.5 mm from the edge (figure 3). When this contact pads 14 of the substrate 12 is made in front of a film resistor (thermistor) 13 at the opposite short side of the substrate 12. Topological elements 15 located on the substrate 12, provide precision film resistor 13 and the contact pads 14 of the substrate 12.

PCB pad 10 (figure 4) connect the s by means of soldering to pads 14 of the substrate 12 and connect SE 11, with the help of connecting wires 16, to the measuring device 2 (figure 1, figure 2, figure 3, figure 4). Printed circuit Board 10 with the sensitive element 11 by means of a screw connection 17, a through hole for fastening 18, rigidly attached to one short edge. Wires 16 connect the contact pads of the PCB 10 with the connector pins 20, which is attached to the housing 19, is screwed to the tee 21. Insulating gasket 22 provides a seal between the t-joint 21 and the housing 19 of the sensor 1. A tight seal between the housing 19 and the connector 20 is provided with a sealing gasket 23. The sensing element 11 of the sensor phase state 1 to the measuring circuit 3 is connected to the measuring device 2.

The device for determining the phase state of gas-liquid flow is as follows.

For analysis of fluid flow in the pipe place the sensor phase state with thermoresistive sensitive element 11 made in "the point" design. The sensing element 11 is located in the flow so that the measurements are carried out at a control point on the vertical axis of the pipe cross section, however, depending on the location of the sensor 1, circuit Board 10 is in a gas-liquid flow above or below the sensing element 11 with thermistor 13 With a controlled DC voltage source 4 to thermistor 13 sensitive element 11 serves the supply voltage. Under the action of electric current is self heating, the resistance of thermistor 13 is increased, a thermal balance is established, during which the temperature and the resistance of thermistor 13 is constant. In case of occurrence of gas bubbles or discontinuities in the fluid flow, the volumetric gas content in horizontal layers of flow increases, there is a phase change medium. The heat balance is disturbed, the temperature of thermistor 13, installed in one of the horizontal layers of the stream (for example, on the Central axis of the pipeline), increases due to changes in the conductivity of the medium, which increases its resistance and the voltage change in the diagonal of the balanced bridge circuit dimension 3, i.e. the change in voltage applied to the measuring device 2, which provides a measurement of the voltage and its transmission to the control system. When reducing the volumetric gas content in gas-liquid flow, the temperature of thermistor 13 sensitive element 11 due to heat transfer decreases, resistance decreases and, accordingly, changes the signal in the diagonal balanced bridge measurement scheme 3. The signal from the measuring circuit 3 through the operational amplifier 5 is fed to the microcontroller with program management 6, connecting the output Izmeritel the Noah scheme to the ADC. Is digital filtering of the measured signals and the formation of a code sequence of digital signals that determine the state of the sensing element 11. Formed codogram reflection of the current availability of gas in a liquid flow at a control point on the vertical section of the pipeline. Using the Builder interface signals 7 information signal about the state of the sensing element 11, i.e. on the phase state of the environment in which SE is served on the information input display system and control 8 (e.g., via interface RS48 5). The formation of the supply voltages for the circuit elements is carried out using a source of stabilized voltage 9.

Figure 5 presents the waveform of the signal changes with the detector element when the phase change medium in the pipeline over time. The results obtained in the analysis of gas-liquid flow using the proposed device with thermoresistive sensor containing sensitive element located on the vertical axis of the pipe cross section and mounted in the control point on the Central axis of the pipeline). Time trials amounted to 330 seconds. The graph shows the change in the voltage in the shoulder balanced measuring bridge is Hemi, the corresponding changes in volume content of the gas stream in a time-dependent analysis. The oscilloscope displays the phase transitions of the environment, namely: gas phase transition from the gas phase into the liquid (decrease in voltage corresponds to the supply of liquid flow, liquid, gas bubbles, which correspond to the voltage spikes, the transition from the liquid phase into the gas phase (increase in voltage corresponds to the end of the feed liquid and the gas phase. Fixation sharp peaks lasting less than 1 second (the delay time), confirms the performance of the operation thermoresistive sensor.

Thus, the proposed technical solution, compared with the prototype and other known technical solutions for a similar purpose, achieve goals, namely improving the performance of the device for determining the phase state of gas-liquid flow.

Device for determining the phase state of gas-liquid flow, comprising a measuring device and thermoresistive sensor phase state, including located along the axis of flow and is rigidly fixed to one short side of the circuit Board installed therein the sensor element made in the form of the substrate, where the film p is sister (thermistor) in the "point" of the performance, while the sensing element is installed at a control point on the vertical axis of the pipe cross section and is connected with the measuring device includes a measuring circuit and a microcontroller with software control and is designed to measure changes in resistance of thermistor associated with the phase change medium in a horizontal layer of gas-liquid flow, and signal processing, characterized in that the sensing element of one short side of the substrate mounted on the edge of the short loose side of the PCB, film resistor (thermistor), placed on the substrate, shifted to the edge of the free short side of the substrate and located at a distance of not more than 0.5 mm from the edge while the pads are designed to attach the substrate to a printed circuit Board made in front of thermistor at the opposite short side of the substrate.



 

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