Where is the sampling point location during hydrocracking sulfidation where you are?
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The refinery unit I work at is equipped with two sets of hydrocracking units, both arranged in series. Each hydrocracking unit consists of two reactors. The old unit has samplers at the outlets of both the refining and cracking reactors; during sulfidation, samples can be taken from both reactors to determine the H2S level. However, the new cracking unit only has a sampler at the refining stage, with no sampling points after the cracking reactor. Has anyone else encountered this situation? In this case, where should the sample from the outlet of the cracking reactor be taken? Please give me some advice!
This was not properly considered during the design at that time; the hydrogen sulfide concentration can be determined using the circulating hydrogen before extraction, but there’s no way to determine the dew point
What is the purpose of the poster’s sampling? To analyze the purity of recycled hydrogen, samples can be taken from the top of the cold high-pressure separator; if it is intended to determine the conversion rate of the cracking reaction, samples can be taken from the recycled oil.
During the vulcanization of our equipment, we take samples at the circulating hydrogen sampling point on top of the liquid separation tank of the circulator
Sampling at the outlet sampling point of the hydrocracking reactor
We take samples at the tank top at the inlet of the circulator (commonly referred to as the low-high pressure section)
We take samples at the liquid separation tank in front of the circulation machine; the operation is simple.
Why reply without reading the question carefully... The sampling point for cyclic hydrogen desulfurization is quite far from the reverse outlet; will this affect the dew point values, and could there be a significant deviation?
From the top of the cold high-pressure section to the liquid separation tank at the inlet of the recycle hydrogen compressor
Our location is on the top of the liquid separation tank at the circulating hydrogen inlet
The circulating hydrogen in hydrocracking units is generally analyzed every 24 hours. The sampling point is located at the top of the liquid separation tank at the inlet of the circulator; the gas sampled there is desulfurized circulating hydrogen. During normal operation, the H2S concentration is relatively low, but it is still necessary to take precautions to avoid hydrogen sulfide poisoning； During the pre-sulfidization of the catalyst, once H2S has penetrated the reactor, the composition of the recycle gas is analyzed every hour; at this time, sampling must be carried out while wearing an air respirator, with one person performing the operation and another acting as a supervisor.