A dual-channel hybrid ultrasonic flowmeter and its measuring method

Abstract

The invention discloses a double-track mixed type ultrasonic flowmeter and a measuring method. The measuring method comprises the following steps: adopting a double-track Doppler method to measure a center flow velocity Vc of fluid flowing through a center of a pipe; adopting a double-track time-relay method to measure a linear average flow velocity Vxc of the fluid flowing through a sound track at the center of the pipe; calculating flow velocity distribution of the fluid to be measured based on the measured center flow velocity Vc and the linear average flow velocity Vxc so as to obtain an average flow velocity Vavg; and calculating to obtain a flow rate of the fluid to be measured according to the average flow velocity Vavg and outputting the flow rate of the fluid to be measured. According to the measuring method disclosed by the invention, the time-relay method and the Doppler method are simultaneously used: a flow rate distributing coefficient can be dynamically calculated and the measuring accuracy is enhanced; due to the dual mode uninterrupted automatic diagnostic technology, the measuring range of the measuring method is enlarged and the measuring method can be uninterruptedly applied to pure single-phase fluid and fluid with a plurality of impurities; and each mode is realized through double-track measuring, thus the reliability and the response speed of measuring are improved.

Description

technical field [0001] The invention relates to an ultrasonic flowmeter and a measurement method, in particular to a dual-channel dual-mode hybrid ultrasonic flowmeter and a measurement method. Background technique [0002] With the rapid development of sensing technology and integrated circuits, ultrasonic flowmeters have been continuously improved. As we all know, the current industrial flow measurement generally has the problem of large pipe diameter and large flow measurement difficulty, and in the field of petrochemical energy transmission, the accuracy of flowmeters is particularly high, especially for flowmeter detection instruments used for custody transfer. Ultrasonic flowmeter installs ultrasonic sending / receiving sensors on the pipe wall of the conveying fluid, and calculates the fluid flow flowing through the pipeline through the integrated circuit connected to the sensor, and its flow measurement accuracy is hardly affected by the temperature and pressure of the...

AI Technical Summary

Problems solved by technology

Emphasize that ultrasonic emission and reception are on the same axis. The measurement methods include the transit time difference method and the pulse Doppler method. The transit time difference method and the pulse Doppler method can measure fluid flow simultaneously or separately according to external signals or instructions, But above-mentioned two kinds of measurement methods are not combined with each other to measure the flow rate of the fluid to be measured. The pulse Doppler method needs to separately measure the flow velocity distribution of the cross-section of the fluid flowing through the pipeline, which has the adaptability problem of actual on-site measurement. The requirements for the distribution of mobile impurities are high, but in reality, most of the mobile impurities of the fluid are concentrated in the center of the fluid, so its accuracy is difficult to guarantee; the ultrasonic flowmeter includes a first flow measurement unit, a second flow measurement unit, a plurality of first and second A sensor unit, and a sensor conversion unit for sharing the sensor unit with the first and second measurement units

The first and second measurement units share a pair of electric / ultrasonic sensors, and each measurement unit independently calculates the flow rate of the fluid to be measured, which has the disadvantages of high requirements for the fluid quality of the fluid to be measured and low measurement accuracy

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