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The vortex flowmeter measures the instability of the gas in the coke oven and its solution The vortex flowmeter is an extremely versatile flow meter that can be used for measurement and control of almost all gas, liquid, and steam flowmeters. The new generation HHWJ series digital Intelligent vortex flowmeter, which breaks through the limitations of traditional simulation methods to deal with vortex signals, identifies and screens vortex probe signals through modern digital signal processing methods, so as to obtain normal flow signals and greatly improve vortex street Anti-seismic performance has fundamentally solved the problem of not resisting earthquakes around the vortex street for decades. It is widely used in the flow of water supply, salt, and wind to the petrochemical, light industry, thermoelectric, papermaking and other industries. The application of vortex flowmeters in the measurement of coke oven gas is still relatively numerous, but there are also some problems that will arise. The reasons for these problems and their solutions are explained below: The causes of faults in on-site measurement systems can be summarized as two major causes of control engineering. All rights reserved. One is caused by flow meters or their associated devices. The second reason is non-flow metering. That is, the flow meter is normal, and the environment or system causes the failure. This type of reason is difficult to find. In addition to asking the technical personnel to be familiar with the performance of the instrument, it is necessary to have extensive knowledge and rich field experience for analysis, reasoning, and multi-party testing before it can be confirmed. Some malfunctions were caused by some unexpected events. Faults on non-flow meters often show instability in the output signal. According to actual experience, when the vortex street flowmeter measures coke oven gas, the reasons for the instability of the output signal are as follows:
1) Vortex flowmeters are not well-suited for applications where strong vibrations are not suitable, but where the magnetic field changes frequently, vortex flowmeters will detect signal outputs that are higher than normal. Practice has proved that in the scene of no gas flow, when the vortex flow sensor is in the changing magnetic field, the vortex flow sensor will induce an error signal to output when the magnetic field changes. When the change is over, the instrument is in a stable magnetic field. The meter will output a normal signal.
2) Due to the high temperature and high humidity of the coke oven gas, there will be moisture in the gas transmission process. The flow of gas drives the water to reciprocate and fluctuate, creating a pulsating flow. When the vortex flow sensor is in this fluid state, the output data suddenly changes greatly, and it cannot reflect the production status at all.
3) Because the coke oven gas has many impurities, it is easy to crystallize, and the impurities condense on the sensor head, thus causing measurement inaccuracy. When the temperature rises, the impurities volatilize, the sensitivity increases, and the signal increases; on the contrary, it decreases. As a result, data is unstable.
4) In the process of instrument wiring, the pressure lines are not true, which results in intermittent signals during transmission.
5) The instrument grounding wire does not meet the specification requirements, so that the 50Hz interference in the strong electricity will enter. When the normal signal is higher than 50Hz, it will output the normal signal, otherwise it will output the wrong signal.
Solution:
1) During the installation and connection of the instrument, ensure that each link is accurate, including the inspection of the site before installation, the wiring of the instrument during the installation, and the grounding line of the system. Data can be output accurately.
2) For the measurement system in operation, the method of "Double Track Metrology Control Engineering Network Copyright, Comparison and Confirmation" and "Alternative Law" can be used to confirm and eliminate the malfunction of the measuring instrument in operation.
3) Periodically clean the instrument as a whole. If necessary, the sensor head of the instrument can be purged to avoid the condensation of impurities at the sensor head. In the cold season, the addition of heat tracing devices in the straight section of the metering section and the meter section also helps to reduce the condensation of impurities at the meter.
4) Regularly drain the pipeline, especially the water in front of the straight pipeline, and set up regular discharge according to specific conditions to reduce the water content in the measurement pipeline segment as much as possible to eliminate the pulsation in the fluid.
5) Strengthen the management of metering system data, set up a regular print function, and analyze the operation of the instrument based on the print data combined with the production status.
Vortex flowmeter to measure the cause of unstable gas in coke oven and its solution
Abstract: A new generation of HHWJ series digital intelligent vortex flowmeter, which breaks through the limitations of the traditional analog method to deal with vortex signal, identifies and screens the vortex probe signal through modern digital signal processing methods, so as to obtain the normal flow signal. It has greatly improved the seismic performance of vortex street and fundamentally solved the problem of not resisting earthquakes around vortex street for decades.