Method and device for measuring flow of multi-component gas

A flow measurement device and flow measurement technology, which are applied in the direction of mass flow measurement device, measurement device, liquid/fluid solid measurement, etc., can solve problems such as poor measurement accuracy, and achieve the effect of improving measurement accuracy

Active Publication Date: 2015-06-17
ENN SCI & TECH DEV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] Embodiments of the present invention provide a flow measurement method and device for multi-component gases, which can solve the problem of poor metering accuracy when measuring multi-component gases

Method used

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  • Method and device for measuring flow of multi-component gas
  • Method and device for measuring flow of multi-component gas

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Embodiment 1

[0031] Embodiments of the present invention provide a flow measurement method for multi-component gas, such as figure 1 As shown, the method includes:

[0032] 101. Dynamically obtain the correction parameters of the measured gas changing with the thermal physical properties.

[0033] For example, dynamically obtaining the correction parameters of the measured gas with the change of thermal physical properties includes: monitoring the change of the physical properties of the measured gas, and obtaining the current correction parameters of the measured gas when the physical properties of the measured gas change; or, obtaining according to a preset cycle The correction parameters of the measured gas change with the thermal physical properties, the preset period is a fixed period or set according to the composition change of the measured gas; or, if the flow correction factor calculated in the current period is the same as the flow correction factor calculated in the previous per...

Embodiment 2

[0043] An embodiment of the present invention provides a method for measuring the flow rate of a multi-component gas. The gas to be measured is a mixed gas composed of any components, such as figure 2 As shown, the method includes:

[0044] 201. Detect the physical parameters of the gas to be measured.

[0045] For example, real-time monitoring of physical properties such as thermal conductivity, working-condition heat capacity, and thermal diffusivity of the measured gas under actual working conditions through physical property sensors, to obtain the measured gas thermal conductivity λ, working-condition heat capacity ρC p And physical parameters such as thermal diffusivity α.

[0046] Preferably, a MEMS (Micro-Electro-Mechanical System, Micro-Electro-Mechanical System) calorimetric property sensor is used to monitor the physical properties of the measured gas, and the MEMS calorimetric property sensor can realize simultaneous detection of multiple physical properties and f...

Embodiment 3

[0085] The embodiment of the present invention provides a method for measuring the flow rate of multi-component gas. The measured gas is preferably natural gas or a mixed gas within the range of natural gas components, such as image 3 As shown, the method includes:

[0086] 301. Detect a thermal conductivity signal of the gas to be measured.

[0087] For example, real-time monitoring of thermal conductivity changes of the measured gas due to components or environmental factors through the thermal conductivity sensor, to obtain the thermal conductivity signal λ of the measured gas 1 ; Detect the temperature T of the gas to be measured through the ambient temperature temperature measuring element on the flow sensor, and detect the pressure P of the gas through the pressure sensor module.

[0088] Preferably, the MEMS calorimetric physical property sensor is used to monitor the thermal conductivity signal of the measured gas, and the MEMS calorimetric physical property sensor c...

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Abstract

The invention discloses a method and device for measuring the flow of multi-component gas, and relates to the technical field of gas flow measurement. The method and device can solve the problem that measurement accuracy is poor when the flow of multi-component gas is measured. The method comprises the steps of dynamically obtaining corrected parameters, changing along with thermophysical property, of measured gas, calculating flow correcting factors of the measured gas according to the corrected parameters of the measured gas, correcting flow signals of the measured gas according to the flow correcting factors of the measured gas, and obtaining the flow value of the measured gas. The method and device are used for measuring the flow of multi-component gas.

Description

technical field [0001] The invention relates to the technical field of gas flow measurement, in particular to a flow measurement method and device for multi-component gas. Background technique [0002] Thermal gas mass flowmeter is an instrument that uses the principle of heat transfer to measure gas flow. According to the basic principle of the thermal gas mass flowmeter, the measurement output of the thermal gas mass flowmeter depends on the gas flow signal and the thermal physical properties at the same time. When the thermal physical properties of the measured gas change, it will affect the thermal gas mass flowmeter. Measurement accuracy. In order to improve the measurement accuracy, the industry usually adopts the solid gas calibration method to obtain a fixed gas flow correction factor for flow correction. [0003] There are at least the following problems in the prior art: the above-mentioned fixed gas flow correction factor is more effective for flow correction of...

Claims

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Application Information

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IPC IPC(8): G01F1/76G01F15/04
Inventor 董胜龙段所行李国国张金龙陶仁义张连奎
Owner ENN SCI & TECH DEV
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