How to handle voltage fluctuations in diesel hydrogenation units?
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Fluctuating voltage is something we encounter frequently; those working in hydrogenation plants, please share how you handle such situations (the best solutions)
There are two points that need attention: 1. First, check the compressor; if the new hydrogen compressor stops operating intermittently, the return line must be closed immediately. Since the pressure in the new hydrogen tank is low while the pressure in the reaction system is high, high pressure can quickly spread to the low-pressure area. Start the new hydrogen generator and the circulation pump in sequence. 2. Closely monitor the high-level and interface levels to prevent high pressure from transmitting to low pressure. When pumping, start the feed pump and the injection pump first.
Generally, transient voltage fluctuations do not affect the operation of large equipment; only some small pumps or air coolers may stop working, and they can be restarted quickly. If the feed pump stops, the furnace may enter interlock mode and shut down; it is necessary to quickly cut off the fuel and get ready to restart the ignition process, while also restarting the feed pump. If the new hydrogen generator stops, it should be restarted promptly. If the circulation pump stops, pre-defined procedures must be followed
1. Slightly reduce the temperature of the heating furnace or turn it off； 2. Inspect all pumps and start those that are stopped ； 3. Check the operation status of each fan, and restart those that have stopped working ； 4. Adjust the liquid levels in various containers and towers in a timely manner to strictly prevent vacuum loss and pressure cross-contamination ； 5. When the operating parameters change significantly, it can result in defective products, which are then sent to the defective product line ；
Check whether it is high-voltage or low-voltage electricity. If it is low-voltage, check whether the pump has stopped running; if it is running, then everything is fine. If it is high-voltage, pay attention to the compressor – if the hydrogen circulation compressor stops working, there is no other option but to release pressure. As long as the circulation machine isn’t stopped, there’s no problem
This post was last edited by Xiaoyu Huifei on 2019-10-29 at 13:38. It’s worth considering an overall solution for handling sensitive loads within the entire facility. The general idea is this: if a particular device shuts down due to a power fluctuation but this doesn’t affect the rest of the facility, there’s no need to take any action other than ensuring that it can restart automatically； If a device has a backup unit, a power fluctuation that triggers the backup to start up will not affect the entire system, and no action is required ； If a device stops operating due to voltage surges and there is a safety interlock signal, then that device needs to have measures taken to address these voltage surges. To analyze the impact of surges on equipment and their consequences, there is a theory called “PIT–Process Immunity Time””