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Natural gas flow meter error and elimination analysis - focus on microfluidic control technology
The main factors that may cause errors in the natural gas flowmeter include: the measurement error caused by the installation of the throttling device; the measurement error caused by the parameter measurement error. Moreover, under the influence of the above error factors, a large amount of influence can be further divided, and corresponding error elimination methods also have certain differences. Natural gas flowmeter error and its elimination analysis 1) From the perspective of the measurement error caused by the installation and use of the throttling device, the specific influence amount and the corresponding error elimination measures include the following aspects: First, during the pressure measurement and the differential pressure measurement process, the pressure guiding tube is clogged. Or the problem of leaking. To solve this problem, it is recommended to eliminate the error by thoroughly cleaning and purging the pressure guiding pipe in a timely manner and shortening the periodic maintenance interval. Secondly, it is a problem that the inlet position of the flowmeter orifice plate is deformed and bent. To solve this problem, it is recommended that the purpose of eliminating errors be achieved through the timely replacement or verification of the orifice plates; again, a large number of internal structures of the natural gas flowmeter's burettes will cause roughness problems. To solve this problem, it is recommended to replace the orifice plate under the condition that the roughness correction is invalid, and to control the diameter ratio within the range of 0.3 to 0.5, or to directly update the pipe; finally, a large amount of dirt is accumulated inside the orifice plate. problem.
2) From the point of measurement error caused by the parameter measurement error, the specific amount of influence and the corresponding error elimination measures include the following aspects: First, the problems of pressure regulation instability and differential pressure fluctuation. In response to this problem, it is recommended to adopt a pressure regulating and post-measurement workflow, and at the same time, pay attention to the maintenance and management of the pressure regulator. If there is a certain defect in the regulator's own performance, it is recommended to update it to a higher differential pressure and higher quality. Regulators, to optimize their operating performance, so as to achieve the purpose of eliminating errors; Second, there is a large error in the relative density of natural gas and design parameters, to correct defects. For this entire, it is recommended that the measured value be calculated and processed in real time and then input into the computer, and the flow value should be corrected to eliminate this error. Finally, the zero drift of the instrument is a problem. To solve this problem, it is recommended to eliminate the error of this term by updating the zero offset with a small amount of calibration on a regular basis.
The application of natural gas flow meter in the measurement of oil and gas in natural gas realizes many advantages such as low price, long service life, simple structure and good adaptability, and can directly determine the relationship between differential pressure signal and flow, eliminating the need for calibration. Links, measurement accuracy has been further improved.