Circulator stopped
Thread Content
If the circulator in the hydrogenation unit stops operating and the emergency pressure relief valve opens, I would like to ask: to shut this valve manually and resume production, under what conditions must the pressure be reduced enough to allow it to be closed? Are there any quantitative metrics for each parameter? Another point is that when the emergency pressure relief valve opens, the interlocked load of the new hydrogen generator drops to 0. I would like to ask how this reduction in load to 0 is achieved Is it the return line valve that directly controls the compressor?
It is sufficient to ensure that the reactor does not overheat; in that case, the hydrogen circulation pump should be stopped and the emergency pressure relief valve opened. If rapid pressure release is a concern, the emergency pressure relief valve can be reset to its closed position, and waste hydrogen can be used to control the temperature of the reactor bed! Additionally, some interlocks do not disable the new hydrogen machine, while other interlocks are set to disable it! I’ve never heard of automatic unloading you’re talking about!
Does your new hydrogen engine come with variable air volume control, or a unloader?
Our SIS doesn’t have this logic. There are only two conditions for opening the emergency pressure relief valve. One is to open it manually, and the other is to open it via soft start on the SIS
Moreover, the outlet chain cut-off valve of the new hydrogen machine has been disconnected
The pressure increase or decrease rate in the reaction system must not exceed 2.8; your operating procedures should specify this requirement. After activating the emergency pressure relief valve for 2–3 minutes, turn it off again. Ensure that the temperature of the bed layer does not exceed the values specified in the process guidelines. As for the new hydrogen supply system, it depends on the actual conditions – once the temperature drops below 230, it is possible to keep the new hydrogen supply system active in order to maintain pressure. Hot hydrogen containing oil can be used; otherwise, if the pressure in the reaction system is too low, the oil will not be able to reach the distillation unit
If a quantitative value must be given, the pressure can be reduced until the temperature drops by 55 degrees below normal, after which the pressure release should be stopped and the bed temperature monitored. If it keeps rising, continue to relieve pressure.
There is interlock to stop the new hydrogen compressor. If the load is reduced to 0, it should be equipped with stepless regulation. The directly variable output is 0
First, the circulating hydrogen compressor is shut down and the emergency pressure relief valve opens. In principle, the vent valve can be reset and closed only after the pressure has been fully relieved; this is done to prevent the bed layer from overheating and to avoid secondary accidents. Additionally, the interlock triggered by the new hydrogen compressor should result in an immediate shutdown – at zero load, the compressor does not perform any work and is in a state without any load
Two are in operation, one is a Holbig, and the other isn’t