Abnormal fluctuations in EDIZA
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This post was last edited by sunjl1981 on 2013-1-6 at 23:50. Our plant uses Beihua Machinery electrolyzers; since they were put into operation, the EDIZA value has been fluctuating abnormally, and we dare not activate the interlock system. This situation has persisted for a long time; there should be no issues with the process itself, as all other indicators are normal. I wonder if any of my colleagues have encountered similar situations – how did they handle them? ， ， -
This post was last edited and replied to by huawei on 2010-7-13 at 14:39. Reply to 1# In the era of gilding, when there are fluctuations in EDIZA, it is necessary to first disconnect the chain, then manually monitor the center point of the bridge to observe the patterns of voltage deviation at that point. At the same time, it is important to monitor the voltage in each cell, especially the voltage at the midpoint of each cell, in order to eliminate any unstable fluctuations in such voltages. After ruling out problems with the cell itself, the next step is to determine if there are issues with the meter itself. Manually connect the wires and use a bridge to check for any issues with the midpoint offset; if there are no problems, it can be ruled out that there is an issue with the cell itself. First, check whether there are any problems with the wiring of the bridge. It is important to wind the connection wires into a spiral shape as required, as this helps to eliminate induced high-frequency interference. Further, check the resistance of the bridge, especially ensuring that the sliding resistor has good contact and exhibits good linearity. Once all these issues have been resolved, the on-site inspection is complete. A bridge is set up on-site and compared with the EDI bridge; if the voltage at the center point remains stable, it indicates that there are no issues on-site. At the same time, the signals transmitted to the DCS are monitored to see whether they match those from the field. If they do not match, then there are problems with the signal transmission or with the control room side. It is necessary to focus on eliminating interference from stray signals as well as issues related to poor connections and inadequate grounding. The most difficult to determine are software issues with the DCS system, which require careful and thorough analysis by your instrument technicians. Generally speaking, to diagnose a fault, one must first break the closed loop, that is, the interlocking mechanism, and then use various methods and techniques in different areas and stages for verification and comparison in order to resolve the issue together. When it comes to electrical issues, precision is essential; there must be no room for a \"more or less\" attitude. A small interference pulse can cause the entire system to go offline, which is no trivial matter.
Contact the instrumentation team to check whether there are any issues with the EDIZA wiring; also check yourself to see if there is any leakage in the electrolyte tank. Additionally, verify whether the adjustable resistor is damaged (it seems to be an imported product from Japan, not available in China). Conduct a thorough inspection
If the electrolyzer is operating at normal load and EDIZA experiences frequent fluctuations, it is usually caused by poor wiring connections. Check the terminal connections, resistors, etc. There were similar failures before.