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Case of Hydrogen Flow Measurement by Precession Vortex Flowmeter

by:Sincerity Group     2022-06-12
Case of Hydrogen Flow Measurement by Precession Vortex Flowmeter At the beginning, the hydrogen produced by the chlor-alkali branch of Yiyan Chemical Plant was initially vented for processing, except for a small amount of hydrogen and chlorine to react to produce synthetic hydrochloric acid. As hydrogen users enter the surrounding chemical parks, hydrogen is sold to users as a trade product through pipeline transportation. In order to ensure fair trade settlement between the supply and demand sides, the plant has added hydrogen measuring instruments to the external hydrogen pipeline. The brine sent from the upstream salt nitrification plant is subjected to primary refining and secondary refining, and then enters the ionic membrane electrolysis device for electrolysis to produce caustic soda, chlorine and hydrogen. The wet hydrogen produced by the electrolysis device is sent to the hydrogen treatment device through pipelines. The dry hydrogen obtained by drying is sent to the downstream device. The characteristics of the production process determine that the pressure of the outgoing hydrogen is low, and the flow rate is also relatively low. Usually, the hydrogen is controlled at a normal temperature of about 25°C, and the pressure is controlled at a gauge pressure of about 0.1MPa. Due to the small molecular weight and low density of hydrogen, hydrogen is an industrial gas that is not easy to measure accurately. At present, according to the different hydrogen pressure and process pipe diameter, the instruments used for measurement mainly include thermal gas mass flowmeter, vortex flowmeter and orifice flowmeter. The production process of the plant has resulted in the low pressure of the hydrogen pipeline, and the differential pressure flowmeter (orifice plate and Proba) and vortex flowmeter have been used successively, but the actual use effect is not satisfactory. In the end, only the two parties can negotiate and resolve, and the measurement data of the flowmeter is for reference only. Through continuous learning, the understanding of low-pressure hydrogen flow measurement has been continuously improved. Both orifice flowmeters and vortex flowmeters have certain requirements for hydrogen pressure. I have considered choosing thermal gas mass flowmeters, but this flowmeter The working principle determines that there are strict requirements for the moisture in the hydrogen. I just happened to learn that a chlor-alkali enterprise supplies chlorine gas to surrounding users with a well-known brand of thermal gas mass flowmeter, resulting in a measurement dispute. The thermal gas mass flowmeter is not considered because the hydrogen drying unit cannot be guaranteed to operate normally at all times. After many investigations and demonstrations, it was decided to try to use the precession vortex flowmeter, which is widely used in the natural gas industry, to measure the hydrogen flow. This flowmeter has the advantages of strong signal and low flow rate characteristics. And it can measure the flow rate, temperature and pressure of hydrogen at the same time, and then automatically perform temperature and pressure compensation and convert it into standard flow rate. All data can be displayed on site and transmitted to the central control room through RS485 communication. The precession vortex flowmeter has a good application effect in the flow measurement of low-density, low-pressure hydrogen in this plant, and has a certain reference for gas measurement in similar working conditions.
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