Large-caliber gas flow measurement has always been a difficult point in energy measurement. In the past, in practice, orifice plates, venturi tubes, power bar flow meters, gas ultrasonic waves, and thermal mass flow meters were used as detection elements. However, they mainly have the following problems: The orifice plate and Venturi mainly exist: 1 large resistance loss; 2 easy to plug the measuring pressure of dirty media; 3 must be installed and disassembled in case of a broken flow, and it is impossible to install the process line for continuous operation; The orifice larger than 1.0m is not covered by the national standard (GB/T2624-93). Therefore, the use of orifice plates and venturis in the gas measurement of metallurgical enterprises is not ideal. Powerlab flowmeters and gas ultrasonics are plug-in flowmeters that can be installed without stopping the air, which brings great convenience for installation and maintenance. However, due to the large amount of dust and water vapor in the converter gas, there is a micro-flow of fluid between the pressure-receiving holes on the flow surface of the Verabar flowmeter, resulting in clogging of the pressure-receiving hole. The gas ultrasonic wave is also the same because of the large amount of dust and water vapor in the converter gas, and the probe is easily fouled, causing reflection and diffraction of the sound wave, which results in inaccurate measurement and large fluctuations in the measurement. Our company's No. 1 steelmaking plant converter gas meter used in the original Veriziba flowmeter and gas ultrasonics all have this problem. The most serious weekly cleaning needs to be removed and cleaned, bringing great maintenance and loss of metering data. Thermal mass flow meters can also be installed without stopping the gas line, but also because the converter gas contains a large amount of dust and water vapor, the heat transfer characteristics of the actual converter gas have undergone great changes, resulting in inaccurate metering. If dust accumulates on the sensor, this is equivalent to putting a “padded cotton†on the sensor, making the measured value low; if there is a water drop on the sensor, this will “cool down†the sensor, making the measured value too large.
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Comparison of Verabar flowmeter and several gas flowmeters