Shutdown procedures for diesel hydrogenation unit
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When the diesel hydrogenation unit is shut down, the water injection is switched from high-pressure air cooling to operation in the thermal high-pressure gas separator and recycle hydrogen heat exchanger. Given that the recycle hydrogen already has a low hydrogen sulfide content, will this further reduce its hydrogen sulfide level? If it’s not changed, will it have a significant impact?
It will not change the hydrogen sulfide level; it’s just that the injection point is different, which helps prevent ammonium salt crystallization. It’s fine if nothing changes, as a short shutdown like these few days will not cause crystallization in the air coolers!
I think as long as the total amount of water added remains unchanged, the impact should be minimal. Although temperature also has an effect on solubility, there shouldn’t be any significant changes