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Moisture flow measuring method based on straight through type gas ultrasonic flowmeter

A technology of flow measurement and flowmeter, which is applied in the field of straight-through gas ultrasonic flowmeter to measure moisture, can solve the problems of incomparability, non-universality, and large differences in the form of false height correction formulas, so as to avoid workload Effect

Inactive Publication Date: 2013-10-16
TIANJIN UNIV
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Problems solved by technology

However, unlike differential pressure flowmeters, since ultrasonic flowmeters from different companies have different structural designs, such as the number of probes, sound channel layout, and insertion methods, etc., when measuring moisture, real flow The form of the false height correction formula obtained by the experimental fitting method is quite different, incomparable, and does not have good universality

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  • Moisture flow measuring method based on straight through type gas ultrasonic flowmeter
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  • Moisture flow measuring method based on straight through type gas ultrasonic flowmeter

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Embodiment Construction

[0015] The present invention will be described below in conjunction with the accompanying drawings and embodiments.

[0016] The moisture measuring method of the present invention is realized based on a monophonic through-type gas ultrasonic flowmeter.

[0017] The structure of the mono channel straight-through gas ultrasonic flowmeter is as follows: figure 1 As shown, A and B are a pair of transducers. according to figure 1 In the flow direction of the fluid shown, the ultrasonic signal is transmitted by A and received by B in the downstream direction, and the propagation time is t 1 ; The ultrasonic signal is transmitted by B, received by A in the upstream direction, and the propagation time is t 2 . The mono channel straight-through gas ultrasonic flowmeter can obtain t by detecting the ultrasonic pulse signal passing through the fluid in the pipeline 1 and t 2 . Assume that the propagation distance of the ultrasonic signal between the transducers is L, the propagati...

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Abstract

The invention belongs to the technical field of measurement of two-phase flow, and relates to a moisture flow measuring method based on a straight through type gas ultrasonic flowmeter. The moisture flow measuring method based on the straight through type gas ultrasonic flowmeter comprises the following steps that (1) the straight through type gas ultrasonic flowmeter is fixed on a pipeline where moisture flow measurement needs to be carried out; (2) moisture flow is measured through the straight through type gas ultrasonic flowmeter, and a virtual height flow Qtp is measured; (3) a section gas containing content alpha is solved according to an experience model; (4) the virtual height flow is corrected, and a corrected gas-phase flow value is obtained. The moisture flow measuring method based on the straight through type gas ultrasonic flowmeter is simple and easy to use, has good universality, and is suitable for predicting the gas-phase flow under the condition of annular mist flow in a horizontal and round pipe.

Description

technical field [0001] The invention belongs to the technical field of two-phase flow measurement, and relates to a method for measuring moisture with a straight-through gas ultrasonic flowmeter. Background technique [0002] Moisture usually refers to a gas-liquid two-phase flow in which the gas phase is a continuous phase and the liquid phase is a discrete phase. The American Society of Mechanical Engineers ASME defines it as a gas-liquid two-phase flow whose Lockhart-Martinelli parameter (L-M parameter) X is less than 0.3. Wet gas is ubiquitous in nature and industrial sites, such as conventional gas field wellhead gas (wet natural gas), coal bed methane, wet saturated steam, and shale gas are all wet gas. With the development of industrial production, the requirements for moisture non-separation measurement are getting higher and higher. However, existing studies have shown that the problem of wet gas flow measurement is very complex and difficult to detect. Using trad...

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Application Information

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IPC IPC(8): G01F1/66
Inventor 徐英张涛陈阳袁超
Owner TIANJIN UNIV
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