Gas/liquid twe phase flow flow pattern identifying method and system based on soft measurement technology

A gas-liquid two-phase flow and identification method technology, applied in the field of gas-liquid two-phase flow flow pattern identification and system based on soft sensor technology, to achieve accurate and reliable signals, rich program functions, and accurate identification results

Inactive Publication Date: 2004-12-15
ZHEJIANG UNIV
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Problems solved by technology

The traditional various existing test methods usually based on sensors and other hardware have not yet obtained very satisfactory results in the field of two-phase flow. Soft measurement technologies (such as state estimation, process parameter identification, artificial neural Network, pattern recognition, etc.) into the field of multiphase flow parameter testing is a development trend of two-phase flow detection

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  • Gas/liquid twe phase flow flow pattern identifying method and system based on soft measurement technology
  • Gas/liquid twe phase flow flow pattern identifying method and system based on soft measurement technology
  • Gas/liquid twe phase flow flow pattern identifying method and system based on soft measurement technology

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Embodiment Construction

[0018] Such as figure 1 As shown in Fig. 1, a block diagram of the flow pattern identification method for gas-liquid two-phase flow based on soft sensor technology is introduced. Soft sensor technology is a new technology emerging in the field of process control and detection in recent years. It adopts the idea of ​​indirect measurement, uses other measurement information that is easy to obtain, and realizes the estimation of the detected quantity through calculation. The so-called soft sensor technology is to use easy-to-measure process variables (often called auxiliary variables or secondary variables), based on the mathematical relationship between these easy-to-measure process variables and the difficult-to-measure process variables (often called leading variables) ( Soft sensor model), through various mathematical calculations and estimation methods, so as to realize the measurement of the process variable to be measured. It can be seen that the soft sensor technology i...

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Abstract

In soft measurement technology frame, the easy-to-measure reliable pressure difference fluctuation signal is adopted as auxiliary variable in detecting flow pattern of two phase flow as the main variable. The acquired pressure difference signal is wavelet analyzed, corresponding characteristic values are extracted, and the characteristic values are used in fuzzy identification of the flow pattern of two phase gas/liquid flow in horizontal pipe. The key soft measurement model is established by means of combining the wavelet analysis technology and fuzzy pattern identifying technology. Then, one flow pattern identifying system for two phase gas/liquid flow is established, and the system consists of test pipeline, pressure sampling hole, pressure sampling pipe, pressure difference sensor, amplifier, data acquiring card, microcomputer and printer. The detected pressure difference signal is processed in the system for pattern identification of two phase gas/liquid flow.

Description

technical field [0001] The invention relates to a flow pattern identification method and system for gas-liquid two-phase flow based on soft-sensor technology. Background technique [0002] With the rapid development of science and technology, the two-phase flow system plays an increasingly important role in the national economy and human life. Involved in a wide range of nature and industrial production. In industries such as chemical industry, petroleum, metallurgy, power and atomic energy, two-phase flow processes are more common. [0003] The distribution of each phase medium in two-phase flow is called flow pattern, or flow state. The difference in flow pattern not only affects the flow characteristics and heat and mass transfer performance of two-phase flow, but also affects the accurate measurement of two-phase flow parameters. For example, the interaction between pressure fluctuations and the transported two-phase flow mixture will produce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/00
Inventor 冀海峰黄志尧王保良李海青
Owner ZHEJIANG UNIV
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