Method control system emergency shutdown valves main gas pipeline

 

(57) Abstract:

The invention relates to techniques for control systems, emergency shutdown of gas pipelines in case of deviation pumping modes from the normal. The method compares the current value of the pressure value measured by the regulated interval time ago, and generate a control action for closing the valve when the pressure by an amount exceeding a specified threshold. Unlike known is that cyclically through a discretization step of measuring the pressure form the matrix of current values of pressure measured during the time interval, less regulated, filtered data and approximate analytical dependence in time. Then interpolate this dependency at the end of the specified time interval, and the control action form when exceeding the interpolated values of the differential pressure specified threshold number of times corresponding to the number of steps of sampling until the end of the specified time interval. The invention provides improved reliability and accuracy in creating the control signal emergency is on during operation of gas pipelines to control systems, emergency shutdown valves when the deviation pumping modes from the normal flow.

A known method of controlling the opening and closing ball valves ("Handbook of automation in the gas industry" under the General editorship centuries Dubrovsky, and Z. Razlagova, Moscow, Nedra, 1990, S. 282), which provides the team Manager. When the pressure in the pipeline Manager analyzes the falling rate of the current pressure. When the excess of the rate of pressure drop given value of the Manager gives a closing command.

The disadvantages of this method are the low precision instruments for pressure measurement and, as a consequence, the low reliability of way management, low efficiency: governing industry document alarm should be developed for 1 minute after exceeding the rate of fall of pressure of a specified value, and the Manager on this procedure spends tens of minutes to several hours, which is unacceptable in case of emergency pipeline.

The closest technical solution of the present invention (the prototype) is a way to automatically interrupt line interrupt device by full automatic closing valve line (Technical documentation) ball valve brand JSW, type JB, 17.07.1981, Japan, Osaka, Tokyo).

The disadvantages of the prototype are:

- regulated interval is defined by throttling the gas jet through the hole, so that it becomes dependent on the condition of the hole. As a result, the formation of a regulated time interval is made with great accuracy;

- low reliability of the control signal closing of the valve (the pressure measured by the regulated interval time ago, is generated and stored using gas-dynamic system that is also inaccurate);

- the absence of noise filtering gas pressure in the pipeline, which leads to false positives valve, in particular, with the passage of the pressure wave associated with the change of the pumping modes;

formation control is carried out in a single condition of closing of the valve during the specified interval that can be with the CSO system reset after false positives in the initial state.

The present invention solves the technical problem of increasing the reliability and validity of the control signal emergency shutdown valves when the deviation pumping modes from the normal flow.

This task is solved in that in the method control system emergency shutdown valves main gas pipeline, including a comparison of the current pressure value of the pressure measured by the regulated interval time ago, and formation control for closing the valve when the pressure by an amount exceeding a threshold value, according to the invention cyclically through a discretization step of measuring the pressure form the matrix of current values of pressure measured during the time interval, less regulated, filtered data and approximate analytical dependence interpolate this dependency at the end of the specified time interval, and control form when exceeding the interpolated values of the differential pressure specified threshold value, a certain number of times corresponding to the number of steps of sampling until the end of the regulated period of time.

Predlagamom way.

After exceeding the pressure drop specified value (threshold value) for guiding industry document for 1 minute should be developed emergency signal (OTS-AJA-98; RAO "Gazprom", S. 11/32).

In accordance with the proposed method measures the pressure in increments of t and stores these values in memory device (see drawing). When receiving n1counts per time interval, less regulated Tregform the matrix of current values of pressure. These values are filtered and approximate analytical dependence. Then perform interpolation obtained based on the end of the specified time interval. When exceeding the interpolated values of the differential pressure Pia predetermined threshold value during the current regulated interval this event is remembered.

Over the sampling interval t measure the next current value of the pressure and form a new matrix of current values of pressure shifted by the interval t with respect to the previous one. The filtering operation, approximation, interpolation and comparison of the interpolated value of the differential pressure Pi+1with the threshold value of the repeat event is incremented. When this condition is not fulfilled, the number of stored events is set to zero.

When you reach the number of excess pressure drop of the threshold of a certain number of times corresponding to the number of steps of sampling n2until the end of regular time interval shape control system emergency shutdown valves main gas pipeline.

The invention is applicable in the operation of gas pipelines to control systems, emergency shutdown valves when the deviation pumping modes from the normal flow.

The use of the proposed method of control systems, emergency shutdown valves main gas pipelines can improve the accuracy of the control signal emergency shutdown valves when the deviation pumping modes from the normal flow by preventing the effect of interference on the control system, due to the filtering of the measured values of pressure, due to the introduction of the forecasting process pressure changes by interpolation and by repeated checks decline in pressure.

The way management system emergency for the value of pressure, the measured regulated interval time ago, and formation control for closing the valve when the pressure by an amount exceeding a specified threshold, wherein the cyclically through a discretization step of measuring the pressure form the matrix of current values of pressure measured during the time interval, less regulated, filtered data and approximate analytical dependence in time, interpolate this dependency at the end of the specified time interval, and the control action form when exceeding the interpolated values of the differential pressure specified threshold number of times corresponding to the number of steps of sampling until the end of the specified time interval.

 

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3 dwg

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