Causes and Solutions of Instability of Coke Oven Gas Measurement with Vortex Flowmeter

A new generation of HHWJ series of digital intelligent vortex flowmeters, which breaks through the limitations of traditional analog processing of vortex street signals, through modern digital signal processing methods to identify and screen vortex street probe signals, so as to obtain normal flow signals, greatly The improvement of the seismic performance of Vortex Street has fundamentally solved the problem of non-vibration around Vortex Street for decades.

Vortex flowmeter for measuring the instability of coke oven gas and solutions. Vortex flowmeter is a flow meter with a very wide range of applications. It can be used for flow measurement and control of almost all gases, liquids and steam. The new generation of HHWJ series digital Intelligent vortex flowmeter, it breaks through the limitations of traditional analog processing vortex signal, through modern digital signal processing method to identify and screen vortex probe signal, so as to obtain normal flow signal, greatly improve the vortex street The seismic performance fundamentally solves the problem of non-seismic around the vortex street for decades. It is widely used in the water supply, salt supply and wind flow of petrochemical, light industry, thermoelectricity, paper making and other industries. Vortex flowmeters are still widely used in measuring coke oven gas, but there are also some problems that will arise. Let me talk about the causes and solutions of these problems: The reasons for the failure of the on-site measurement system can be summarized as two major causes. All rights reserved. One is caused by the flow meter or its associated equipment. The second is the reason for non-flow meter, that is, the flow meter is normal, and the environment or system causes the fault, which is difficult to find. In addition to requiring technicians to be familiar with the performance of the instrument, they also need to have extensive knowledge and rich field experience for analysis, reasoning, and multi-party testing to confirm. Some failures are caused by unexpected events. The failure of non-flow meters is often manifested as unstable output signals. According to actual experience, when the vortex flowmeter measures coke oven gas, the reasons for the unstable output signal are as follows:

1) Vortex flowmeters are not well-suited for installation in strong vibrations. It is well known to users, but in the case of frequent magnetic field changes, the vortex flow sensor will detect a higher than normal signal output. Practice has proved that in the field without gas flow, when the vortex flow sensor is in a changing magnetic field, the vortex flow sensor will output an error signal at the moment of the magnetic field change. When the change is over, the instrument is in a stable magnetic field , The meter will output a normal signal.

2) The coke oven gas has high temperature and high humidity when shipped from the factory, so there will be moisture in the gas transportation process. The gas flow drives the water to fluctuate reciprocally, thus forming a pulsating flow. When the vortex flow sensor is in this fluid state, the output data is suddenly large and small. It can't reflect the production status at all.

3) Due to the many impurities in coke oven gas, it is easy to crystallize, and the impurities condense in the sensor head, resulting in measurement inaccuracy. When the temperature rises, the impurities volatilize, the sensitivity increases, and the signal increases; on the contrary, it decreases. As a result, the data is unstable.

4) The pressure line is not solid during the wiring of the instrument, resulting in intermittent signals during transmission.

5) The ground wire of the instrument does not meet the requirements of the specification, so that the 50Hz interference in the strong electricity enters. When the normal signal is higher than 50Hz, the normal signal is output, otherwise the error signal is output.

Solution:

1) During the installation and connection of the instrument, ensure that every link is accurate, including the inspection of the site before installation, the instrument wiring during the installation process, the system grounding wire, etc. Control Engineering Network All rights reserved, so as to ensure that the detection is true The data can be output accurately.

2) For the measuring system in operation, the method of "Copyright of Double Track Measurement and Control Engineering Network, Contrast Confirmation" and "Alternative Method" can be used to confirm and eliminate the faults of the measuring instruments in operation.

3) Regularly clean the instrument as a whole, and if necessary, purge the sensor head of the instrument to avoid the condensation of impurities at the sensor head. In the cold season, adding a heat tracing device to the metering straight pipe section and the instrument part also helps to alleviate the condensation of impurities at the metering instrument.

4) Drain the pipeline regularly, especially the moisture in front of the straight pipe section, and set a special person to discharge regularly according to the specific situation, reduce the moisture in the metering pipe section as much as possible, and eliminate the pulsation in the fluid to the greatest extent.

5) Strengthen the management of the measurement system data, set up a regular printing function, and analyze the operation of the meter based on the printing data combined with the production status.

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