Gas flow measuring device for large-diameter pipes

Abstract

The invention relates to a gas flow measuring device suitable for large-diameter gas pipelines and smoke pipelines. The gas flow measuring device of the invention mainly comprises a swing component arranged in gas pipeline fluid and a device for measuring the swing angle of the swing component. Compared with the prior art, the measuring device of gas flow is a plug-in measuring device which has the advantages of simple structure and convenient measurement. The gas flow measuring device is suitable for measurement of large flow, suitable for large-diameter pipes, and is especially suitable for determination of gas flow in large-diameter gas pipelines and smoke pipelines; the gas flow measuring device is slightly affected by fouling degree of a measured medium, such as solid or liquid impurities; and the gas flow measuring device can be applicable to pipelines of a certain oblique angle. The gas flow measuring device has the advantages of high measurement range ratio, low permanent pressure loss, little possibility of being blocked and worn, convenient installation, simple structure, low cost, simple operation and easiness in large-scale production. According to the gas flow measuring device, requirements for straight pipe sections are lower, and the gas flow measuring device can be used as long as the gas flow measuring device is not too close to a bent pipe section.

Description

technical field [0001] The invention relates to the field of fluid mechanics, especially the field of pipeline internal flow and blunt body flow around. Specifically, the invention relates to a gas flow measurement device for a blunt body exposed to fluid in a large-diameter pipeline. By means of the swing of the structure Kinematics measure gas volume flow in pipes. Background technique [0002] In the coal mining industry, in order to strengthen the importance of controlling gas disasters through gas drainage, the State Administration of Coal Mine Safety and Supervision formulated the policy of "gas drainage first, then mining, wind production, monitoring and monitoring" in 2002, clearly It is proposed that the quality of gas drainage should be firstly paid attention to in gas control, and the monitoring and monitoring can be realized by measuring the gas flow, so as to reduce the occurrence of gas disasters. Because the gas has a series of characteristics such as high hu...

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Problems solved by technology

The vortex flowmeter is only suitable for the measurement of high-velocity media, and it will not be able to measure the low-flow gas drainage pipeline

To measure the flow rate of low-velocity media, it is necessary to reduce the gas pipeline and increase the gas flow rate through the vortex flowmeter, but this will bring additional permanent pressure loss and variable diameter investment and installation problems

In addition, the vortex flowmeter is also very sensitive to the vibration of the surrounding environment, and also has very strict requirements for the installation of straight pipe sections

To accurately measure the flow velocity of the pipeline medium, the standard pitot tube flowmeter must select a micro differential pressure that can stably measure 0.1Pa, which requires a high performance of the differential pressure sensor, and the pressure hole at the front of the flowmeter is extremely small, so it is easy to It is blocked, therefore, it is not suitable for long-term online measurement, and it is suitable for the measurement of coal mine on-site flow

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