Faults and solutions during the use of turbine flowmeters

1. Coke oven gas has high temperature and high humidity when it leaves the factory, so there will be moisture in the gas transportation process. The gas flow drives the water to fluctuate back and forth, thus forming a pulsating flow. When the vortex flow sensor is in this fluid state, the output data fluctuates, and it cannot reflect the production status at all. Answer: For the metering system in operation, the method of 'dual-track metering control engineering network copyright, comparison and confirmation' and 'substitution method' can be used to confirm and eliminate the faults of metering instruments in operation. 2. Because coke oven gas has many impurities and is easy to crystallize, the impurities condense on the sensor head, resulting in inaccurate measurement. When the temperature rises, the impurity volatilizes, the sensitivity increases, and the signal increases; on the contrary, it decreases. As a result, the data is unstable. Answer: In the process of instrument installation and connection, each link should be ensured to be accurate, including inspection of the site before installation, instrument wiring during installation, system grounding, etc. Control Engineering Network Copyright, so as to ensure that the real data and can output accurately. 3. It is widely known to users that the turbine flowmeter is not suitable for installation in places with strong vibration, but in places where the magnetic field changes frequently, the vortex flow sensor will measure a signal output higher than the normal value. Practice has proved that in a scene without gas flow, when the vortex flow sensor is in a changing magnetic field, at the moment the magnetic field changes, the turbine flowmeter sensor will sense an error signal and output it. When the change is over, the instrument is in a stable magnetic field , the meter will output a normal signal. Answer: Strengthen the management of the data of the turbine flowmeter metering system, set up the regular printing function, and analyze the operation of the meter based on the printed data and the production status. 4. The grounding wire of the instrument does not meet the requirements of the specification, so that the 50Hz interference in the strong current enters. When the normal signal is higher than 50Hz, the normal signal is output, otherwise it will output an error signal. Answer: Drain the pipeline regularly, especially the water before the straight pipe section. According to the specific situation, set up a special person to discharge it regularly, reduce the water in the metering pipe section as much as possible, and eliminate the pulsation in the fluid to the greatest extent. 5. In the wiring process of the instrument, the pressure line is not solid, resulting in intermittent signals during the transmission process. Answer: Regularly clean the instrument as a whole, and if necessary, purge the sensing head of the instrument to avoid condensation of impurities at the sensing head. In the cold season, adding a heating device to the metering straight pipe section and the instrument part is also beneficial to alleviate the condensation of impurities at the metering instrument.

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