Meter coefficient self-correcting method of gas turbine flowmeter

Abstract

The invention discloses a meter coefficient self-correcting method of a gas turbine flowmeter. An electromagnetic coil is embedded into a flowmeter shell, a fixed detection force is applied to equivalently simulate the axial impact force of fluid on turbine blades according to a set interval time, frequency variation corresponding to the detection force is calculated according to the frequency measured by a flow detector, and a new meter coefficient is calculated by using the relationship between flow and the frequency variation, thus calculating a flow measuring value according to the updated meter coefficient. The method solves the problem of inaccurate measurement results due to meter coefficient drifting caused by scaling, corrosion, abrasion, physical property change of fluid medium and the like. With the on-line self-diagnosis function, the method improves the measurement accuracy of the gas turbine flowmeter, avoids the inconvenience in detachment, calibration and the like of the flowmeter at regular intervals, prolongs the service life of the flowmeter, broadens the application area of the flowmeter and enables the flowmeter to be still normally available in a situation that cleanness of detected gas is lower.

Description

technical field [0001] The invention relates to a self-calibration method of a gas turbine flowmeter, in particular to a self-calibration method of an instrument coefficient of a gas turbine flowmeter. Background technique [0002] Turbine flowmeter is a velocity-type flow meter that can measure gas volume flow. It has the advantages of simple structure, light weight, and large flow capacity. The flowmeter is based on the principle of conservation of momentum. When the measured fluid hits the turbine blades, the turbine rotates, and the rotation speed changes with the flow rate. The corresponding flow value is calculated by measuring the number of revolutions of the turbine. Instantaneous flow and cumulative flow are displayed through secondary instruments. [0003] At present, there is a common disadvantage of gas turbine flowmeters, that is, it is difficult for turbine flowmeters to maintain calibration characteristics for a long time, and problems such as fouling, beari...

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Problems solved by technology

[0005] However, there are still some deficiencies in the above two flowmeters: for the self-calibrating twin-turbine gas flowmeter, there must be an auxiliary wheel in its structure, which increases the length of the flowmeter, and for the turbine blade angle, installation angle, turbine speed, There are strict requirements on the radius of the wheel shell, which increases the design cost and manufacturing difficulty

However, the temperature and pressure compensation smart gas flowmeter cannot help the decrease in the accuracy of the flowmeter caused by the fouling and corrosion of the turbine.

Moreover, this kind of flowmeter requires corresponding circuit design, complex structure, many links, and high cost.

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