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Ultrasonic testing method for concentration of liquid-solid two-phase flow

A technology of testing method and measuring method, which is applied to the analysis of fluid by using sound wave/ultrasonic wave/infrasonic wave, material analysis and measuring device by using sound wave/ultrasonic wave/infrasonic wave, which can solve the problem that the error of emission intensity change cannot be automatically corrected, the sensitivity is low, Errors cannot be automatically corrected, etc., to achieve the effect of eliminating unstable emission intensity, small size, and high sensitivity

Inactive Publication Date: 2004-11-03
NANJING NORMAL UNIVERSITY
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Problems solved by technology

[0005] ① Moving plate method: it is difficult to control the moving distance of the sensor, and it is difficult to control the parallelism before and after the movement
[0006] ②Single-amplitude method: circuit drift cannot be automatically corrected, errors caused by probe contamination cannot be automatically corrected, and errors caused by emission intensity changes cannot be automatically corrected
[0007] ③Double amplitude ratio method: relatively low sensitivity

Method used

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  • Ultrasonic testing method for concentration of liquid-solid two-phase flow
  • Ultrasonic testing method for concentration of liquid-solid two-phase flow
  • Ultrasonic testing method for concentration of liquid-solid two-phase flow

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Embodiment Construction

[0029] Measurement method of the present invention is:

[0030] ①Use two parallel plates at a fixed interval, and the distance between them is about L=100mm; the ultrasonic probe is placed on one side of the parallel plate, and the ultrasonic wave is reflected back and forth between the two sides of the parallel plate (that is, the multiple pulse reflection method) to obtain multiple recovery , the medium between the parallel plates is the measured two-phase flow medium;

[0031] ②Under the same launch wave, the first, second and nth echoes are measured (the n echo is the last echo, and theoretically, each echo has an exponential decay law);

[0032] ③ Calculate the envelope area A1 of the first to nth echoes and the area A2 of the envelope of the second to nth echoes respectively;

[0033] ④ Obtain the attenuation coefficient through formula calculation

[0034] α = 1 2 L ln ...

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Abstract

The ultrasonic testing method for the concentration for two-phase solid-liquid flow includes: adopting two parallel plates with fixed interval of L=100 mm with two-phase flow medium in between and setting the ultrasonic probe beside the parallel plates to make ultrasonic wave reflected between the parallel plates and obtain multiple echoes; measuring the first to the n-th echoes of the same emitted wave; calculating the envelope area A1 of the first to the n-th echoes and the envelope area A2 of the second to the n-th echoes separately; calculating the attenuation coefficient based on formula alpha=(1 / 2L)ln(A1 / A2), where L is the acoustic path of the sensor; and measuring different alpha values corresponding to different concentration sample compounded in lab so as to obtain the calibration curve of alpha value vs sample concentration.

Description

technical field [0001] The invention relates to a two-phase flow testing method, which belongs to the technical field of ultrasonic testing. Background technique [0002] The measurement of liquid-solid two-phase flow is important in the transportation of powder ash in thermal power plants, the transportation of coal-water slurry in coal-water slurry furnaces, the control of pulp concentration in the papermaking process, and the determination of sediment content in large rivers. App background. [0003] The traditional measurement method mainly adopts the sampling and weighing method, but the operation process is complicated, the efficiency is low, and it is not convenient for continuous and real-time control of the process. In order to seek this change, many scholars have done a lot of work on the measurement of liquid-solid two-phase flow in the past. Various measuring instruments have been developed, such as isotope analyzers, vibrating two-ph...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/02
CPCG01N2291/044
Inventor 方彦军曹国华常健
Owner NANJING NORMAL UNIVERSITY
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