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Moisture over-reading compensation and flow measurement method combined with vortex amplitude characteristics

A technology of flow measurement and vortex street, applied in the direction of liquid/fluid solid measurement, volume/mass flow generated by mechanical effects, measuring devices, etc., can solve the problem of accurate measurement of moisture flow, complicated operation, and difficulty in achieving continuous accurate measurement And other issues

Inactive Publication Date: 2019-08-30
TIANJIN UNIV
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  • 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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  • Moisture over-reading compensation and flow measurement method combined with vortex amplitude characteristics
  • Moisture over-reading compensation and flow measurement method combined with vortex amplitude characteristics
  • Moisture over-reading compensation and flow measurement method combined with vortex amplitude characteristics

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Embodiment Construction

[0039] The present invention will be further described in conjunction with accompanying drawing and implementation now.

[0040] This example is the specific implementation of the moisture overreading compensation and flow measurement method combined with the vortex street amplitude characteristics. 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.

[0041] 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 piezoelectric sensor: the piezoelectric probe converts the flow signal into an electrical signal, and the hardware circuit converts The original signal is subjected to charge amplification and voltage amplification, and after band-pass filtering (f=200-2500 Hz), the data is collected by the NI-USB acquisition card, the sampling frequency is 20kHz, the num...

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Abstract

The present invention relates to a moisture over-reading compensation and flow measurement method combined with the vortex amplitude characteristics. The method comprises the following steps: collecting the pressure p, the temperature T, and the vortex timing signal s(t) output by a piezoelectric sensor; calculating the gas density [rho]g and the liquid density [rho]p; extracting the frequency fVSand the amplitude AVS of a vortex signal; calculating the apparent gas phase volume flow Qg without over-reading correction, and taking the apparent as an iteration initial value of the gas phase volume flow Qg; and performing iterative calculation until convergence: calculating the apparent gas phase velocity Usg corresponding to the gas phase volume flow Qg, calculating the signal amplitude atthe time of single-phase gas, calculating the droplet loading amount [phi]p, calculating the over-reading factor OR, and calculating the moisture gas phase volume flow after performing over-reading compensation to obtain the final gas phase volume flow Qg and the droplet loading amount [phi]p in the moisture.

Description

technical field [0001] The invention belongs to the field of gas-liquid two-phase flow measurement, and relates to a moisture overreading compensation and flow measurement method combined with vortex street amplitude characteristics. 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 liquid...

Claims

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Application Information

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IPC IPC(8): G01F1/32G01F15/00
CPCG01F1/32G01F15/00
Inventor 王超李金霞丁红兵孙宏军
Owner TIANJIN UNIV