UA72190U - Method for control of operation of a gas measuring station - Google Patents

Abstract

A method for control of operation of gas-measuring station at which operation of the devices for determination of gas flow rate is based on one physical effect and control of serviceability of sensors is included for those measuring parameters that characterize gas flow rate, and additional control of temperature sensors. The control of serviceability of sensors is carried out with set period through simultaneous measurement on each operating measuring pipeline of the values of first parameters that characterize gas flow rate by means of sensors of the first device for determination of gas flow rate and the values of the second parameters that characterize gas flow rate, by means of sensors of the second device for determination of gas flow rate, determination of difference of values of the first and respective second parameters that characterize gas flow rate, on each operating measuring pipeline. If the difference of the values of respective parameters on the measuring pipeline does not exceed the value of set error of measurement of the parameter, one considers the sensors to be operable. If the difference of the values of any respective parameters exceeds the set error of measurement of the parameter, one considers that sensors that measure those parameters on given measuring pipeline are out of order and one issues for operational staff information on failure of those, and additional control of temperature sensors of the first and second devices for determination of gas flow rate of all the measuring pipeline is carried out one time at the end of given time interval through comparison of temperature values measured by temperature indicators of both devices for determination of gas flow rate of each measuring pipeline to temperature value measured simultaneously in that very pipeline with control thermometer with class of accuracy not lower than that of temperature sensors. At coincidence, with account of accuracy of indicator and control thermometer, of the value of temperature measured by the sensor and the value measured by control thermometer, one considers that the temperature sensor is in good order, and at discrepancy, with account of accuracy of the sensor and control thermometer, of value of temperature measured by any sensor and the value measured by control thermometer one considers the temperature sensor to be nonserviceable with issuing information on its failure to operational staff.

Description

The useful model belongs to measuring equipment and can be used, in particular, in the gas industry to control the operation of the gas measuring station (gas flow measurement point) in the process of measuring the flow of the environment.

A known method of metrological diagnostics of flow meters installed in branched pipelines (a.s. USSR Mo 1461138, cl. (53 О1Е 25/00, BV Mo 11, 1994), which consists in measuring the flow in the supply pipeline and measuring the flow in to each of the parallel pipelines, while maintaining a constant flow in the supply pipeline, block one of the parallel pipelines, measure the flow in the remaining pipelines, and detect the flow meter with an increased error under the condition

Me, k-akik -k)h Iv tv) no ; where a and b reading of the flow meter installed in the ith parallel pipeline with all open parallel pipelines and with one (not the ith) blocked pipeline, respectively;

K; and Kk; - the first and second cost coefficients, respectively, are equal

K; -06/5 5, K; -06/5U 5

I-i I-8, where p ha

1st - the total flow through all parallel pipelines, which is determined by the indicators of the flowmeters;

Wow

1st - total flow through all parallel pipelines when one is blocked; b. permissible error of the flow meter being diagnosed; 5 - the permissible error of maintaining the flow in the supply pipeline, then open the pipeline in which the flow meter with an increased error is located, measure the flow in it and in the pipeline with a working flow meter and determine the increase in the error of the flow meter in the overlapping pipeline, with the condition

No Kk -05|хKa t TB de 9. reading of the flow meter installed in the overlapping pipeline;

Ka. grading coefficient, which is equal to the ratio of the flow rate in the overlapped pipeline to the flow rate in the pipeline where the i-th serviceable flow meter is installed; eh permissible error of the flow meter in the overlapping pipeline.

This method of metrological diagnosis of flow meters installed in branched pipelines, as well as the method of monitoring the operation of the gas measuring station, which is claimed, includes the measurement of gas flow through each of the measuring pipelines (in each of the parallel branches) using the first gas flow measurement device (flow meter ). However, the lack of measurement on each working measuring pipeline of the values of the parameters characterizing the gas flow using the corresponding sensors of the first and second gas flow measuring devices, and control with a given period of the correct operation of the pressure drop, pressure and temperature sensors of all working measuring pipelines, as well as monitoring during the specified time interval of the temperature sensors of the first and second gas flow measuring devices of all working measuring pipelines reduces the probability of gas flow measurement and complicates the operation of the gas measuring station, because it does not allow detecting the failed sensor.

A known method of diagnosing a variable pressure drop flowmeter (a.s. USSR Mo 1647276, cl. svi OO 25/00, BV Mo 17, 1991), which consists in the fact that the flow rate is determined by the variable pressure drop method, while using the main system of measurement, the temperature and pressure at the inlet of the narrowing device and the pressure drop across the narrowing device are measured by the first selection method, and with the help of a duplicate measurement system, the pressure drop at the narrowing device is measured by another selection method, the ratio of the measured pressure drops is determined and it is compared with the ratio of pressure differences, determined in advance, and the metrological failure of the flow meter is judged by the degree of deviation of the compared values.

This method of diagnosing the variable pressure drop flowmeter, as well as the method of controlling the operation of the gas measuring station, which is claimed, includes determining the gas flow through the measuring pipeline using the first gas flow measurement device. However, the absence of measurement on each working measuring pipeline of the values of the second parameters characterizing the gas flow, with the help of the corresponding sensors of the second device for measuring the gas flow and control with the specified period of serviceability of the sensors of pressure drop, pressure and temperature of all working measuring pipelines, as well as control during the specified period the time interval of the temperature sensors of the first and second gas flow measuring devices of all working measuring pipelines reduces the probability of gas flow measurement and complicates the operation of the gas measuring station, because it does not allow detecting the failed sensor.

The closest in terms of technical essence is the method of determining the flow rate of the medium in the pipeline (patent of Ukraine No. 94286, cl. SOTE 25/00 Bul. Mo. 8, 2011), which consists in the simultaneous measurement of the flow rate 0, the first method using the first device, the action of which based on one of the known physical effects, and measuring the same flow in a second way using a second device, the action of which is based on another physical effect, while flow measurements are carried out by devices located at a set distance from each other, one of the devices is designated for measurement of commercial gas consumption, the obtained values of the consumption flow into the inequality

They are 0 oo-v where 61. the relative error when measuring the consumption by the first method; b2 relative error when measuring flow by the second method and, if the inequality is not fulfilled, then it is considered that a metrological failure has occurred, and a signal is issued about it, but if the inequality is fulfilled, then it is considered that there is no metrological failure, while if commercial gas consumption is measured , then the result of the measurement is considered to be the flow value obtained by the device intended for measuring commercial gas flow, and if the gas flow is measured for technological needs, then the value of the flow of OO in the pipeline is taken to be equal to half the sum of the measured values, i.e.

This method of determining the flow rate of the medium in the pipeline, as well as the method of controlling the operation of the gas measuring station, which is claimed, includes the determination of the gas flow rate by the first and second devices. However, the lack of a second device for determining gas flow, the action of which is based on the same physical effect as the first, the lack of control of the serviceability of the sensors,

From which parameters characterizing gas flow are measured with a given period, and additional control of temperature sensors once during a given time interval, performance of sensor serviceability control by comparing the simultaneously measured values of the corresponding first and second parameters characterizing gas flow, respectively measured by sensors of the first and sensors of the second device for determining the gas flow and issuing information about the serviceability or malfunction of a pair of corresponding sensors depending on the results of the comparison, performing additional control of the temperature sensors of the first and second devices, determining the gas flow of all measuring pipelines by comparing the temperature values measured by the temperature sensors of both devices with the temperature value , measured in the same measuring pipeline by a control thermometer with an accuracy class not lower than that of temperature sensors, and issuing information to operational personnel about a malfunction of the sensor in the event of a discrepancy the value of the temperature measured by the sensor with the value measured by the control thermometer, taking into account the accuracy of the sensor and the control thermometer, narrows the functionality of the known method, because it does not allow to control the correct operation of the sensors of the parameters characterizing the gas flow, on which the gas flow is calculated, and, accordingly , detect a faulty sensor, which complicates the operation of the gas measuring station and reduces the probability of determining the gas consumption.

The basis of the useful model is the task of improving the method of monitoring the operation of the gas measuring station (gas flow measurement point) by expanding the functional capabilities by monitoring the serviceability of sensors characterizing gas flow on all working measuring pipelines, as well as additional control of temperature sensors, which allows to increase the probability determination of gas flow and detection of failed sensors.

The problem is solved by the fact that in the known method of monitoring the operation of a gas measuring station (gas flow measurement point), which includes determining the gas flow on each working measuring pipeline using the first and second devices for determining the gas flow, ACCORDING TO THE USEFUL MODEL, the action of the first and second determination devices gas consumption is based on a single physical effect and introduced control of the serviceability of sensors that measure parameters characterizing gas consumption and additional control of temperature sensors, while control of the serviceability of sensors is carried out with a given period by simultaneous measurement on each working measuring pipeline of the values of the first parameters, which characterize the gas flow, using the sensors of the first device for determining the gas flow and the values of the second parameters characterizing the gas flow, using the sensors of the second device for determining the gas flow, determining the difference between the values of the first and the corresponding second parameters , characterizing the gas flow, on each working measuring pipeline, and if the difference in the values of the corresponding parameters on the measuring pipeline does not exceed the indicated measurement error of the given parameter, then the sensors are considered to be working, and if the difference in the values of any relevant parameters exceeds the indicated error measurement of this parameter, then it is considered that the sensors measuring these parameters on this measuring pipeline are faulty and provide operational personnel with information about their malfunction, and additional control of the temperature sensors of the first and second gas flow detection devices of all measuring pipelines is performed once at the end of the specified time interval by comparing the temperature values measured by the temperature sensors of both gas flow detection devices of each measuring pipeline with the temperature value measured simultaneously in the same measuring pipeline by a control thermometer with a class accuracy is not lower than that of temperature sensors, and if, taking into account the accuracy of the sensor and control thermometer, the temperature value measured by the sensor coincides with the value measured by the control thermometer, it is considered that this temperature sensor is working, and if there is a discrepancy, taking into account the accuracy of the sensor and control thermometer, the temperature value measured by any sensor with the value measured by the control thermometer, consider that this temperature sensor is faulty, and issue information about its malfunction to the operating personnel.

The use of the first and second devices for determining gas flow, the action of which is based on one physical effect, the introduction of serviceability control of sensors that measure parameters characterizing gas flow, and additional control of temperature sensors, execution

From monitoring the serviceability of the sensors with a given period by simultaneously measuring the values of the first and the values of the second parameters characterizing the gas consumption, determining the difference between the values of the corresponding first and second parameters on each working measuring pipeline and issuing information about the serviceability or malfunction of a given pair of sensors, depending on whether exceeds or exceeds the specified difference in the value of the specified measurement error of the parameter measured by these respective sensors, performing additional control of the temperature sensors of the first and second gas flow detection devices of all measuring pipelines at the end of the specified time interval by comparing the temperature values measured by the temperature sensor of each of the gas flow detection devices of each measuring pipeline, with the temperature value measured in the same measuring pipeline by a control thermometer with an accuracy class not lower than that of temperature sensors, and issuing operative information to the personnel about the malfunction of the sensor in the event of a discrepancy between the temperature value measured by the sensor and the value measured by the control thermometer, taking into account the accuracy of the sensor and the control thermometer, it allows to significantly expand the functionality of the proposed method, due to the control of the serviceability of the sensors that measure the parameters, that characterize the gas flow, on which the gas flow is calculated, of all working measuring pipelines, which also allows to increase the probability of determining the gas flow and to identify failed sensors.

The drawing shows the scheme of the gas measuring station.

The gas measuring station includes a supply gas pipeline 1, an inlet manifold 2, connected to a supply gas pipeline 1, measuring pipelines 3-1,...,3-P,..., 3-M, connected to an inlet manifold 2 , outlet manifold 4, which is connected to measuring pipelines 3-1,...,3-p,...,3-M, outlet gas pipeline 5, to which outlet manifold 4 is connected, the first devices for determining gas flow 6- 1,...,6-p,...,6-M, each of which is installed in the corresponding measuring pipeline 3-1,...,3-P,...,3-M, the second flow determination devices of gas 7-1,...,7- p,...,7-M, each of which is installed in the corresponding measuring pipeline 3-1,...,3-P,...K3-M, pockets for installation of control thermometers 8-1,...,8-p,...,8-M, each of which is installed in the corresponding measuring pipeline 3-1,...,3-P,...,3-M , the central control device 9, to the inputs of which the information outputs of the first 656-1,...,6-P,...,6-M and the second 7-1,...,7-P,... 7-M gas flow detection devices, input buses 10-1,. ..,10-p,....10-M, connected to the control inputs of the corresponding gas flow detection devices 6-1,...,6-P,...,6-M, and 7-1 ,...,7-P,...27-M.

A control signal is sent to the 10-p input bus, which is used to measure parameter values with the 6-p and 7-p devices for monitoring the serviceability of the sensors. At the information outputs of the b-p and 7-p devices, the first measured values of the gas flow are output sequentially, and then the measured values of the parameters, which are used to check the serviceability of the sensors.

The parameters characterizing gas flow are different for different types of gas flow detection devices. For example, for devices operating on the basis of the variable pressure differential method, these will be pressure differential, pressure and gas temperature, and for gas meters, these will be gas flow, pressure and gas temperature.

The method of monitoring the operation of the gas measuring station is implemented in the following way.

For the certainty of the description, let's assume that gas flow determination devices are installed at the gas measuring station, which are implemented on the basis of gas flow determination by the method of variable pressure drop.

During operation, the gas measuring station ensures the determination of the flow of gas transported through it. The first b-p and the second 7-p gas flow detection devices, installed on each measuring pipeline 3-p, with a given measurement period, for example 2 s, simultaneously measure the parameters characterizing the gas flow through the measuring pipeline 3-p, for the case under consideration it will be the pressure, pressure difference and temperature of the gas, according to the values of these parameters, as well as the value of the design parameters (for example, the diameters of the measuring pipeline and the narrowing device, the coefficients of expansion of the materials from which they are made, and others) and conditionally constant parameters (for example density, chemical composition of gas, etc.) the first b-p and the second 7-p devices for determining the gas flow rate calculate the instantaneous gas flow rate, integrating which over the duration of the measurement period, they obtain the gas flow rate for this time. Then, in accordance with the established regulations, on the basis of the gas consumption for the measurement period, they determine the integral gas consumption for the set time interval and issue its value through their information output to the central control device 9, which determines the gas consumption through each measuring pipeline for longer time intervals, for example, a day, and throughout the gas measuring station,

By summing up the gas flow through all separate included measuring pipelines.

Control of the serviceability of the sensors that measure the parameters characterizing the gas flow through the measuring pipeline 3-n is performed according to the command sent simultaneously to the first 6-n and the second 7-n gas flow detection device on the 10-n bus either by the operator manually, or from a time interval sensor, such as a timer, with a period equal to, for example, one hour. When a control command is received via the 10-n bus, the first 6-n and second 7-n gas flow detection devices record it and, after another measurement of the first and second parameters characterizing the gas flow, issue their values through their information output to the central device control 9 after issuing the amount of gas consumption. In the central control device 9, the differences of all the corresponding first and second parameters of each measuring pipeline 3-n are determined, in the considered case it is pressure, pressure drop and gas temperature, and the obtained values are compared with the indicated error of the corresponding parameter - pressure, pressure drop or gas temperature. If the differences do not exceed the corresponding values of the listed errors, then the sensors are considered to be working. If the difference in the values of one or more parameters exceeds the corresponding specified error, then it is considered that the sensors measuring these parameters are faulty, and the central control device 9 issues information about this to the operative staff of the gas measuring station.

Additional control of the temperature sensors of the first and second gas flow detection devices of all measuring pipelines is performed once during the specified time interval, which, according to the technological regulations, is equal to two months.

Control of the temperature sensors of the first and second devices for determining the gas flow rate of the measuring pipelines is performed similarly to the control of the serviceability of the sensors that measure the parameters characterizing the gas flow rate, separately for each measuring pipeline. When performing control on the measuring pipeline 3-n, a control thermometer is installed in the pocket 8-n of the measuring pipeline 3-n, and after the time required for the stabilization of its readings, the operator applies to the first 6-n and the second 7-n devices for determining the flow of gas along the tire 10th command to fix the values of the first and second parameters. When receiving a control command, the first b-p and second 7-p gas flow detection devices fix it and output the results of the first and second temperature measurements through their second output to the central control device 9. When the command is sent to the 10-p bus, 60 is also measured the value of the gas temperature in this measuring pipeline by a 3-point control thermometer, which is automatically or manually transmitted to the operator. Next, depending on the availability of technical means, the temperature values measured by the sensors of the gas flow detection devices 6-n and 7-n are compared automatically or by the operator with the value measured by the control thermometer, and based on the results of the comparison, the serviceability of the temperature sensors of the gas flow detection devices 6-n and 7-p, and if they are faulty, they issue information about this to the operative staff of the gas measuring station.

If faulty sensors are detected, either adjustment or replacement of sensors with serviceable ones is carried out.

Claims (1)

10 USEFUL MODEL FORMULA A method of controlling the operation of a gas measuring station (gas flow measurement point), which includes determining the gas flow on each working measuring pipeline using the first and second devices for determining the gas flow, which differs in that the action of the first 15 and second devices for determining the gas flow is based on one physical effect and introduced the control of the serviceability of the sensors that measure the parameters characterizing the gas consumption and the additional control of the temperature sensors, while the control of the serviceability of the sensors is performed with a given period by simultaneous measurement of the values of the first parameters characterizing the consumption on each working measuring pipeline of gas, with the help of 20 sensors of the first device for determining the gas flow rate and the values of the second parameters characterizing the gas flow, with the help of the sensors of the second device for determining the gas flow rate, determining the difference between the values of the first and the corresponding second parameters that characterize gas flow, on each working measuring pipeline, and if the difference in the values of the corresponding parameters on the measuring pipeline does not exceed the specified measurement error of the given parameter, then the sensors are considered to be working, and if the difference in the values of any of the corresponding parameters exceeds the specified measurement error of the given parameter parameter, then it is considered that the sensors that measure these parameters on this measuring pipeline are faulty and provide operational personnel with information about their malfunction, and the additional control of the temperature sensors of the first and second devices for determining the gas flow rate of all measuring pipelines is performed once at the end of the specified interval time by comparing the temperature values measured by the temperature sensors of both gas flow detection devices of each measuring pipeline with the temperature value measured simultaneously in the same measuring pipeline by a control thermometer with an accuracy class of no higher than that of temperature sensors, and if, taking into account the accuracy of the sensor and control thermometer, the temperature value measured by the sensor coincides with the value measured by the control thermometer, it is considered that this temperature sensor is working, and if there is a discrepancy, taking into account the accuracy of the sensor and control thermometer, the temperature value measured by any sensor with the value measured by the control thermometer, consider that this temperature sensor is faulty, and issue 40 operational personnel with information about its malfunction. G va ip and | " . Te Zav savvn Yi i shchi i I : shchu - Me |. Yi V. poets, shennu Mornnnia in -e-Sh- B SCHE and Z zhk. / izn i i ; Niche I and | IL OOSSSSSSSSSSSSSSYUS 2