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Vortex street humidity excessive compensation and flow measurement method based on wavelet ridge feature extraction

A flow measurement and feature extraction technology, applied in the field of gas-liquid two-phase flow measurement, can solve the problems of complex operation, difficult to achieve continuous accurate measurement, and high cost

Active Publication Date: 2019-08-30
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods are complex to operate, high in cost and difficult to achieve continuous accurate measurement
At present, it is difficult to achieve accurate measurement of wet gas flow with only one vortex flowmeter

Method used

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  • Vortex street humidity excessive compensation and flow measurement method based on wavelet ridge feature extraction
  • Vortex street humidity excessive compensation and flow measurement method based on wavelet ridge feature extraction
  • Vortex street humidity excessive compensation and flow measurement method based on wavelet ridge feature extraction

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Embodiment Construction

[0044] The present invention will be further described in conjunction with accompanying drawing and implementation now.

[0045] This example is the specific implementation of the vortex street moisture overreading compensation and flow measurement method based on wavelet feature extraction in moisture measurement. Wet gas working pressure p=270~440kPa, gas phase volume flow Q g =9~17m 3 / h, liquid phase mass flow m l =1.7~17kg / h.

[0046] The flow chart of signal acquisition is attached figure 1 Shown: Collect working condition pressure p, working condition temperature T and vortex street sequence number s(t), where s(t) is collected by the piezoelectric sensor: the piezoelectric probe converts the flow signal into an electrical signal, and the hardware circuit converts the The original signal is subjected to charge amplification and voltage amplification, and after band-pass filtering (f=200~2500Hz), the data is collected by the NI-USB acquisition card, the sampling freq...

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Abstract

The invention relates to a vortex street humidity excessive compensation and flow measurement method based on wavelet ridge feature extraction. The vortex street humidity excessive compensation and flow measurement method comprises the following steps of: acquiring a pressure p, a temperature T and a vortex street timing signal s(t) output by a piezoelectric sensor; calculating a gas density rho gand a liquid density rho p; extracting an instantaneous frequency f omega (t) of a vortex street signal by utilizing a wavelet ridge detection method based on continuous wavelet transform; calculating a feature frequency fVS and a frequency fluctuation value RSDf of the vortex street signal; calculating a liquid droplet loading amount phi p; calculating an excessive factor OR; and calculating moisture gas-phase volume flow after excessive compensation.

Description

technical field [0001] The invention belongs to the field of gas-liquid two-phase flow measurement, and relates to a vortex street moisture overreading compensation and flow measurement method based on wavelet ridge feature extraction. Background technique [0002] Moisture flow widely exists in the natural gas industry, and its accurate measurement has an important impact on pipeline transportation and trade settlement, and is directly related to environmental protection, energy management and its full utilization [1]. When the gas velocity is high, annular mist flow is the most dominant wet gas flow pattern, in which the liquid phase exists in the form of entrained droplets and liquid film on the wall [2]. Vortex flowmeters are widely used in the on-line measurement of moisture due to their robustness, economy, high turndown ratio, and small pressure loss. However, when the traditional single-phase vortex flowmeter is applied to wet gas measurement, a small amount of liqu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/32
CPCG01F1/325
Inventor 王超李金霞丁红兵孙宏军
Owner TIANJIN UNIV