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Method and device for online measurement of multiphase wet gas flow and phase holdup

A technology of airflow flow and measurement method, applied in the field of multiphase flow measurement

Active Publication Date: 2018-04-17
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Patent ZL 201210190815.1 discloses a method and device for online measurement of gas-phase flow in gas-liquid two-phase flow. The patent is based on a single throttling element. By measuring a single differential pressure and establishing a measurement equation to measure gas-phase flow, the invention patent is only used to measure Gas-phase flow rate in gas-liquid mixture

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  • Method and device for online measurement of multiphase wet gas flow and phase holdup
  • Method and device for online measurement of multiphase wet gas flow and phase holdup
  • Method and device for online measurement of multiphase wet gas flow and phase holdup

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Embodiment Construction

[0076] The present invention will be further described below in conjunction with the accompanying drawings.

[0077] Basic theory of the present invention is:

[0078] The differential pressure when the wet gas flows through the V-cone throttling device is ΔP, and the corresponding apparent wet gas mass flow rate m apparent for:

[0079]

[0080] In the formula, A is the inlet cross-sectional area of ​​the V-cone throttling device, D is the inner diameter of the throttling device; β is the throttling ratio of the V-cone throttling device, A t is the throat cross-sectional area of ​​the V-cone throttling device; ρ g is the gas phase density;

[0081] Define the two-phase mass flow coefficient K of the V-cone throttling device as:

[0082]

[0083] In the formula, m is the real flow rate of the wet gas, and is the mass flow rate of the gas phase in the wet gas m g and liquid phase mass flow ml Sum;

[0084] In moisture measurement, Lockhart-Martinelli (L-M) param...

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Abstract

The invention discloses a multiphase wet air flow and phase content online measurement method and device. The multiphase wet air flow and phase content online measurement device comprises a cylindrical V cone throttling device; a throttling cone body and a temperature sensor are arranged in an inner chamber of the V cone throttling device along the wet air flow direction in turn; the throttling cone body is connected with a retraction section differential pressure sensor and an expansion section differential pressure sensor through a pressure taking pipe; a pressure sensor, the retraction section differential pressure sensor, the expansion section differential pressure sensor and the temperature sensor are connected with a data processing system; a wet air flow inlet of the V cone throttling device is connected with a capacitance probe device through a flange. According to the multiphase wet air flow and phase content online measurement method and device, the wet gas passes through the V cone throttling device which is provided with the pressure sensor, the differential pressure sensors and the temperature sensor and statistical data are transmitted to the data processing system through the pressure sensor, the differential pressure sensors and the temperature sensor to be processed.

Description

technical field [0001] The invention belongs to the field of multiphase flow measurement, and in particular relates to an online measurement method and device for multiphase wet gas flow and phase holdup. Background technique [0002] As a special gas-liquid flow, "moisture" widely exists in industrial processes such as petroleum, chemical industry, nuclear energy, refrigeration and metallurgy. The measurement of its flow and phase parameters is of great significance to industrial production. Wet gas includes three-phase wet gas streams and two-phase wet gas streams: for example, during natural gas production, the presence of free water in formations and heavy hydrocarbons condense at reduced pressure to form condensate, which is a mixture of oil and water. Therefore, three-phase wet natural gas flow of oil, gas and water is formed in the gathering and transportation pipeline; gas-liquid online metering of single well of gas well is of great significance to gas field develop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F7/00G01N33/00
Inventor 白博峰贺登辉
Owner XI AN JIAOTONG UNIV
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