Special post on diesel hydrogenation interlocks – thank you all for your active participation!
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This post was last edited by Huaxiang Hydrogen Production on 2018-3-24 at 15:30. It is a dedicated thread on diesel hydrogenation interlocks; thank you all for your active participation! Interlocks when the circulating hydrogen pump stops:—— The hydrogen feed pump stops (there is no interlock to shut it down at the pump outlet) ——— The heater is shut down (including the quick-opening dampers being opened) ——— The outlet of the new hydrogen pump is closed (the new hydrogen pump does not stop operating, and it is a reciprocating compressor). It is believed that the outlet of the new hydrogen pump should not be closed, as this could cause the overpressure safety valve at that outlet to activate or lead to more serious consequences.
Please describe the question clearly.
If you have doubts about the interlock logic in the device and consider it unreasonable, please describe the existing logic in detail and explain the reasons why it is unreasonable
Interlock for shutdown of the cyclohydrogen machine——Shutdown of the hydrogen feeding pump (no interlock to shut it down at the pump outlet)--------Shutting down of the heating furnace (including opening of the quick-opening dampers)--------Closing of the outlet of the new hydrogen machine (the new hydrogen machine does not shut down and it is a reciprocating compressor). It is considered that the outlet of the new hydrogen machine should not be closed, as this could cause the overpressure safety valve at that outlet to activate or lead to more serious consequences.
It would be better to include these sentences in the content of your post; otherwise, no one will be able to understand it at first glance~~~
The shutdown of the cyclic hydrogen compressor inevitably results in a very low hydrogen mixture flow rate; the low-speed pressure relief valve opens, the feed pump stops operating, as does the lean amine liquid pump and the injection pump. All outlet shut-off valves are closed, the main fuel gas supply to the furnace is cut off, the outlet shut-off valve of the new hydrogen compressor is closed, and the return valve closest to the compressor outlet opens.
The circulator stopped, which caused the feed pump to stop, the main burner of the heating furnace to go out, and the new hydrogen generator to stop； The feed pump stops, the outlet flow is very low, and the main pipe isolation valve and control valve close.
If the interlock listens to the feed pump but the pump outlet is not closed, there is a risk of backpressure due to a failed check valve； The shutdown fan of the heating furnace shouldn’t stop, right? It seems that opening the quick-opening air valve doesn’t help; can this speed up the cooling process? The outlet of the new hydrogen machine is closed; if everything returns to automatic mode at each level, there shouldn’t be any major problems, right?
Generally, in diesel hydrogenation, there is no low-speed pressure relief, right?