Method and device for removing liquid and ice of probe in gas medium flow measurement
A technology of flow measurement and gas medium, which is applied in the field of probe dehydration and deicing in the flow measurement of gas medium, which can solve the problems that the flowmeter cannot measure normally, achieve high time efficiency and energy efficiency, and improve the effect of accuracy
Active Publication Date: 2016-07-27
SHENZHEN MAXONIC AUTOMATION CONTROL CO LTD
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Problems solved by technology
[0004] The technical problem to be solved by the embodiments of the present invention is to solve the defect that the flowmeter cannot measure normally when the measured gas medium contains liquid droplets or the gas temperature is too low to freeze the RTD probe in the existing thermal gas mass flowmeter. A method and device for removing liquid and deicing a probe in gas medium flow measurement
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[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0036] See figure 1 , figure 1 It is a flow chart of the method for removing liquid and deicing the probe in the flow measurement of the gas medium according to the first embodiment provided by the present invention. Such as figure 1 As shown, the method for removing liquid and deicing the probe in the flow measurement of the gas medium in this embodiment includes steps S1-S3:
[0037] S1. Measure the current temperature and flow of gas;
[0038] For each ...
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The embodiment of the invention discloses a method and device for removing liquid and ice of a probe in gas medium flow measurement. The method for removing liquid and ice of the probe in gas medium flow measurement includes the following steps that S1, current temperature and flow of gas are measured; S2, heating current for removing liquid and ice is calculated according to the measured temperature and the measured flow; S3, according to preset heating time and the heating current for removing liquid and ice, the self-heating probe of a flow meter is controlled to be heated. The liquid and ice removing and heating step is introduced into an existing gas flow measurement method, so that the self-heating probe is subjected to liquid and ice removal in the measurement process, and accordingly precision of flow measurement in liquid-containing ice-containing gas media is improved. Besides, the invention further provides a method for calculating the heating current for removing liquid and ice. The calculation method is simple and efficient, and it is guaranteed that high time efficiency and energy efficiency are achieved in the liquid and ice removing heating process.
Description
technical field [0001] The invention relates to the technical field of instruments and meters, in particular to a method and device for removing fluid and ice from a probe in gas medium flow measurement. Background technique [0002] Thermal gas mass flowmeter is an instrument that uses the principle of thermal diffusion to measure gas flow. The flow measurement principles of the current common thermal gas mass flowmeters mainly include: the principle of constant temperature difference, the principle of constant power and the principle of constant ratio. More advanced German-American thermal mass flowmeters usually use the principle of constant ratio to measure gas flow. This thermal gas mass flowmeter consists of two thermal resistance sensors with a positive temperature coefficient, one of which is a resistance temperature detector (RTD) that generates heat when it is energized to supplement the heat taken away by the fluid flowing through it, and its resistance value fo...
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Inventor 吴荣波纪彬彬
Owner SHENZHEN MAXONIC AUTOMATION CONTROL CO LTD