Emission of recycled hydrogen
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In everyone’s hydrogenation units, the purity of the recycled hydrogen decreases over time due to prolonged use, which affects the reactions taking place in the reactors. How do people generally improve the purity of recycled hydrogen? Is the recycle hydrogen discharged based on the results of laboratory analysis? Is it generally discharged into the high-pressure gas main or the low-pressure gas main? About how much is emitted? Thank you, everyone, share your thoughts – extra points!
The emissions are generally discharged into the low-pressure gas system. The hydrogen exhaust valve functions as a pressure-reducing regulator. As for how often discharge is necessary, it depends on the company’s specific requirements regarding the concentration of recycled hydrogen; generally, a concentration of over 85% is sufficient, and tests are required for analysis
Shouldn’t it be discharged into the flare? Is it safe to discharge such a high concentration of hydrogen sulfide into the gas system?
The circulating hydrogen desulfurization system is very useful; it worth considering
This post was last edited by lgq420923 on 2023-2-19 at 09:32. The purity level is determined according to the requirements of each company; in the past, we usually set it at around 90%. Secondly, venting should generally be done to the flare system; it must not be directed into the low-pressure gas system, as this can cause pressure fluctuations in that system
This depends on the hydrogen purity in the recycled hydrogen, as well as the concentrations of carbon monoxide and carbon dioxide. We require that the hydrogen purity in diesel operation be maintained at no less than 85%, while carbon monoxide and carbon dioxide levels should be kept within 200 ppm; if these levels exceed this range, low-pressure gas is used for displacement.
The exhaust gas with low concentrations is sent for desulfurization followed by membrane separation, while the remaining exhaust gas is used for hydrogen production or as gas