RU2790955C1 - Method for determining capacity of electromagnetic valve - Google Patents

Abstract

FIELD: gas industry.

SUBSTANCE: invention can be used to determine the actual capacity of the electromagnetic valve located in the inhibitor dosing unit. In the proposed method for determining the capacity of the electromagnetic valve by spilling liquid, at first, the correction to the volume of spilled liquid during the time spent on pressure stabilization is determined, and then, based on the pressure drop across the valve measured by a pressure gauge and the water flow through the valve measured with a measuring tank, the flow factor is determined. Determining the actual capacity of the electromagnetic valve as part of the inhibitor dosing unit allows to effectively solve the problem of dosing the inhibitor into gas-bearing wells in order to eliminate hydrate formation due to a more accurate calculation of the methanol supply to the well. In addition, periodic checks of metering valves can be used to determine the degree of their wear in order to timely correct the algorithms of the system of the inhibitor supply to the wells. The proposed method can be used by conducting receipt inspection of inhibitor dosing units in order to identify products with factory defects and inconsistencies with the manufacturer’s technical specifications.

EFFECT: improved measurement accuracy, reduced measurement time.

4 cl, 3 dwg, 3 tbl

Description

The invention relates to the gas industry and can be used to determine the actual capacity of the electromagnetic valve located in the inhibitor dosing unit.

Inhibition is carried out to prevent the formation of hydrates in pipelines through which gas from gas-bearing wells enters the commercial gas treatment plant. Hydrohydration of the pipeline in the absence of inhibition or its insufficient amount can completely block the flow of gas from the well, so gas inhibition is an important component of the gas production process. As an inhibitor, methanol is usually used, which is fed into pipelines from gas-bearing wells using special dosing units, which are controlled by an automated process control system (APCS) from an integrated gas treatment unit (CGTP). The automated process control system calculates the required amount of methanol based on the technological parameters (pressure, temperature, humidity) of the produced gas and sends the appropriate command to the dosing unit. When forming a command to a dosing unit, it is important to know its dosing capacity. The main element that determines the throughput of the dosing unit is the solenoid valve, upon opening of which, upon command from the automated process control system, the inhibitor begins to be supplied to the destination pipeline. The amount of inhibitor depends on the Kv of the valve and its opening time.

The creation of this invention is due to the need to test the flow capacity of the electromagnetic valve, which determines the capacity of the inhibitor dosing unit, by pouring method, since due to manufacturing inaccuracies or wear during operation, the valve capacity may differ from the value declared by the manufacturer.

Existing test procedure for the leading manufacturer of valves for inhibitor dosing units (Explosion-proof solenoid valve KEO 03/250/650/111 with EV 07/DC/024/2. Calculation of throughput capacity, code TP5122-0662 PP1. - LLC NPP "Technoproekt", 2018 , https://www.solenoid.ru/catalog/diametr-nominalnyy-dn-80-100/keo-03-250-650-111-s-ev-07-dc-024-21/) is based only on the theoretical calculation of valve capacity, which does not involve instrumental verification.

Technical solutions for determining the throughput of electromagnetic valves in the composition of inhibitor dosing units have not been found.

A device is known that relates to checking the throughput of valves, containing a source of test medium, a flow meter, a converter of pneumatic signals into electrical ones (USSR author's certificate 1293514, IPC G01M 3/28, published on February 28, 1987).

The known technical solution has the following disadvantages:

- low measurement accuracy, determined by the total error of the flow meter with a pneumatic output signal and a pneumoelectric converter (usually more than 2.5%);

- long measurement time to obtain a stable flow through the flow meter (about 1 min);

- high requirements for the stability of the high-pressure water source due to the longer measurement time (about 1 min).

The objective of the present invention is to eliminate these shortcomings, namely to improve the measurement accuracy, reduce the measurement time, and simplify the design.

This problem is solved by the fact that in the proposed method for determining the throughput of an electromagnetic valve by spilling liquid, first measure the correction volume of spilled liquid during the time spent on pressure stabilization, and then measure the volume of liquid for the full time of opening the valve and monitor the pressure drop across the valve and on Based on the obtained data, the valve capacity coefficient is calculated. The pressure stabilization time is 4 seconds. The total valve opening time is 15 seconds. The valve capacity coefficient is calculated by the formula:

Kv=((V-Vp)/11)/√P, where:

V - the volume of water measured by the measured capacity for the full time of opening the valve (ml);

Vp - correction volume of water, measured by measuring capacity for 4 seconds of valve opening (ml);

P - gauge pressure (bar);

Kv - valve capacity factor (ml/s).

The technical result consists in increased accuracy in determining the throughput coefficient, which is achieved due to the preliminary determination of the correction to the volume of liquid poured through the valve. The introduction of this correction makes it possible to exclude from the calculation of Kv the volume of liquid poured through the valve at an unstable pressure at the valve inlet.

The essence of the invention is illustrated by diagrams and photographs. In FIG. 1 shows a schematic electro-hydraulic diagram of the stand that implements the proposed method, Fig. 2 - scheme of the stand control unit. The photograph (Fig. 3) shows the control unit of the stand with the cover open in the working position.

To implement the method in the presented diagrams and photographs, the following elements were used:

1 - solenoid valve;

2 - manometer;

3 - measured capacity;

4 - electronic control unit;

5 - power supply unit of the electronic control unit;

6 - programmable relay of the electronic control unit;

7 - valve opening button for 4 seconds;

8 - valve opening button for 15 seconds;

9 - electric circuit for controlling the valve solenoid;

10 - source of high pressure water;

11 - supply pipes to the valve.

12 - valve solenoid.

The way to determine the capacity of a valve by the pouring method is to calculate the capacity factor (Kv) based on the measured data: ΔP (pressure drop across the valve) and Q (liquid flow through the valve). The valve capacity coefficient (Kv) is the conditional volume flow of liquid through a fully open valve, m ³ / h at a pressure drop of 1 bar under standard conditions (atmospheric pressure 101325 Pa, temperature 20 ° C). The general formula for calculation when using water as a test liquid is: Kv=Q/√ΔP, (1). To determine Q, it is necessary to measure the volume of water that has passed through valve 1 for a given valve opening time at a pressure drop (ΔP) across the valve. The pressure drop across the valve (ΔР) in this case is equal to the readings of the excess pressure on the pressure gauge 2 (Fig. 1), since the water is drained into the measuring tank 3 at atmospheric pressure equal to zero. The opening time of the valve 1 is set using the electronic control unit 4 (Fig. 1, Fig. 2). When used as a source of high pressure 10 of a conventional water supply system with a pressure of 4 to 5 kgf / cm ² hydraulic connections - supply tubes 11 to the valve can be made with plastic pneumatic tubes. When using a water-filled cylinder with a pneumatic accumulator (for pressures of 10 kgf / cm ² and above), hydraulic connections 11 are made with a red-copper tube.

When calculating according to formula (1), it is important that ΔР be constant, but it has been practically established that in the first time after the valve is opened, this pressure drops by almost two times and pulsates within up to 20% of the pressure gauge scale 2. To eliminate this drawback, it is determined correction for the time of pressure stabilization according to pressure gauge 2. Accordingly, the correction for the volume of water that has passed through valve 1 during this time is taken into account.

To determine the correction, it was experimentally established that the time of pressure stabilization in front of the valve when it is opened does not exceed 4 seconds for all valve flow sections, therefore, the correction volume of water spilled through the valve is determined in 4 seconds. The total opening time of the valve during spillage is set to 15 seconds.

Taking into account the above, formula (1) takes the form:

Kv=((V-Vp)/11)/√P, (2) where:

V is the volume of water measured by measuring container 3 for the total opening time of valve 1 (ml);

Vp - correction volume of water, measured by measuring container 3 for 4 seconds of valve 1 opening (ml);

Р - excess pressure according to pressure gauge 2 (bar);

Kv - valve 1 capacity factor (ml/s).

The method is carried out as follows.

Button 7 (SB-4s) of the control unit 4 by applying current to the solenoid 12 of valve 1 opens the valve for 4 seconds in order to completely fill the tubes suitable for the valve with water. After the interval (4 seconds) has elapsed, the voltage is automatically removed and valve 1 closes. Then, the valve is re-opened with button 7 (SB-4s) for 4 seconds, while using a measuring container 3, the volume of water that has passed through valve 1 is measured and the correction value Vp is obtained. Next, open the valve with button 8 (SB-15 s) for 15 seconds, while using a measuring container 3, measure the volume of water that has passed through valve 1. As a result, the value V is obtained. ). Finally, the valve capacity factor Kv is calculated using formula (2).

An example of the implementation of the invention.

To implement the proposed method at the applicant's enterprise, a stand was assembled consisting of:

- from the electronic control unit (4) for opening/closing the valve including: power supply (4) Phoenix Contact QUINT-PS-100-240AC/24DC/5, programmable relay (6) OWEN PR110-24.8D.4R and control buttons (7 , 8): SB-4s, SB-15s, pressing which opens the valve for 4 seconds and 15 seconds, respectively;

- valve, the capacity of which is checked;

- source of high pressure water (from 4 to 30 kgf/cm2) with a manometer;

- measured capacity.

The OWEN relay was programmed in the OwenLogic software.

Solenoid valves KEO 03/250/650/111 with serial numbers: 01, 02, 03, 04, 05, 06 are presented for testing along with a set of replaceable jets that provide a diameter of the valve flow section of 2.0 mm and 1.4 mm. Without a jet, the valve bore diameter is 2.8 mm.

The purpose of the tests was to experimentally determine the coefficients of valve capacity (Kv) and compare them with passport values.

The tests were carried out by the pouring method, while the valve opening time was set, the pressure drop across the valve was recorded, equal to the inlet pressure on the valve (because the drain was carried out at atmospheric pressure) and the volume of water spilled through the valve. To improve the accuracy of determining the throughput coefficients, for each type of valve flow area, a correction was determined that takes into account the valve opening time and the time for pressure stabilization in front of the valve. When determining the correction, it was experimentally established that the time of pressure stabilization in front of the valve, including the valve opening time, does not exceed 4 s for all flow sections, therefore, the correction volume of water spilled through the valve was determined in 4 s. The valve opening time during spillage was set equal to 15 s.

The results of tests with a valve flow area of 2.8 mm are presented in table 1:

The test results of the valve No. 1806276006 with a flow area of 2.0 mm are presented in table 2:

Determination of the actual throughput of the electromagnetic valve as part of the inhibitor dosing unit makes it possible to effectively solve the problems of dosing the inhibitor into gas-bearing wells in order to eliminate hydrate formation (leading to a decrease in the throughput of the pipeline) due to a more accurate calculation of the methanol supply to the well, preventing its overrun. In addition, periodic checks of metering valves can be used to determine the degree of their wear in order to timely correct the algorithms of the inhibitor supply system to the wells. The proposed method can be used when conducting input control of inhibitor dosing units in order to identify products with factory defects and non-compliance with the manufacturer's technical specifications.

Claims (9)

1. A method for determining the throughput of a solenoid valve by spilling liquid, characterized in that first the correction volume of the spilled liquid is measured during the time taken to stabilize the pressure, and then the volume of liquid is measured for the full time the valve is opened and the pressure drop across the valve and on the base is monitored of the obtained data, the valve capacity coefficient is calculated. 2. The method according to claim 1, characterized in that the pressure stabilization time is 4 seconds. 3. The method according to claim 1, characterized in that the total opening time of the valve is 15 seconds. 4. The method according to paragraphs. 1-3, characterized in that the valve capacity coefficient is calculated by the formula Kv=((V-Vp)/11)/√Р, where V is the volume of liquid measured by the measured capacity for the full time of opening the valve (ml); Vp - correction volume of liquid, measured by measuring capacity for 4 seconds of valve opening (ml); P - gauge pressure (bar); Kv - valve capacity factor (ml/s).

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