How to solve the problem of intelligent vortex flowmeter in measuring coke oven gas
2021-06-30
Vortex flowmeter in the measurement of coke oven gas will appear some problems, the following let's analyze the causes of these problems and solutions.
The reasons for the failure of the on-site measurement system can be summarized into two main reasons, one is caused by the flow meter or its associated equipment; Second, non-flowmeter reasons, that is, the flowmeter is normal, and environmental or system reasons cause failure, such reasons are more difficult to find.
In addition to requiring technical personnel to be familiar with the performance of the instrument, it is also necessary to have a wide range of instrument knowledge and rich field experience for analysis, reasoning, and multi-party testing to confirm. Some failures are the result of unexpected events. The failure of the non-flow meter is often manifested as an unstable output signal.
According to practical experience, when vortex flowmeter measures coke oven gas, the output signal is unstable for the following reasons:
1.vortex flowmeter is not suitable for installation in the case of strong vibration is widely known by users, but in the case of frequent changes in the magnetic field, vortex flow sensor will also be disturbed, measured higher than normal signal. Practice has proved that in a field without gas flow, when the vortex flow sensor is in a changing magnetic field and the magnetic field changes at the moment, the vortex flow sensor will induce an error signal output. When the change ends and the meter is in a stable magnetic field, the meter will output a normal signal.
2.because coke oven gas impurities, easy to crystallize, impurities condense in the sensor head, resulting in meter metering misalignment. When the temperature rises, the impurities volatilize, the sensitivity increases, and the signal is enhanced. On the contrary, it decreases; Thus, the data is unstable.
3. Coke oven gas has high temperature and high humidity when leaving the factory, so there will be moisture in the gas transmission 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 is large and small, which cannot reflect the production situation at all.
4.the instrument wiring process is not solid, resulting in intermittent signal transmission process.
5.the instrument grounding wire 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 output signal is normal, and on the contrary, the error signal will be output.
The solution:
1.in the vortex flow meter installation, connection process, should ensure the accuracy of each link, including the installation of the site before the inspection, installation process instrument wiring, system grounding wire, etc., so as to ensure the detection of real data and accurate output.
2.for the operating measurement system can use the "double track measurement, comparison and confirmation" method, as well as the "alternative method" to confirm and eliminate the fault of the operating measuring instrument.
3.regularly drain the pipeline, especially the water before the straight pipe section, according to the specific situation, set a special person to discharge regularly, as far as possible to reduce the water in the metering pipe section, and maximize the elimination of the pulsation in the fluid.
4. Regularly clean the vortex flowmeter as a whole, and purge the sensing head part of the instrument if necessary to avoid condensation of impurities at the sensing head. In the cold season, the addition of heat tracing devices in the metering pipe section and the instrument part is also beneficial to alleviate the condensation of impurities at the vortex flowmeter.
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