【Q&A Question 267】2018.09.30
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【Q&A Question 267】September 30, 2018: Briefly explain why recycled hydrogen needs to be released Emission can be used to control the accumulation of light hydrocarbons in the recycled hydrogen. The accumulation of light hydrocarbons in the circulating hydrogen reduces the partial pressure. At the same time, the exhaust gas can help control the concentrations of ammonia, carbon monoxide, and carbon dioxide in the circulating hydrogen; ammonia is harmful to catalysts, while carbon monoxide and carbon dioxide can react to form methane gas, which increases system pressure and leads to catalyst deactivation. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Correct: 3 wealth, Incorrect: 1 wealth ； Mass posting of posts – rated based on the lowest score ； Replies that are unrelated to the answer are considered spam and will be deleted immediately. For management purposes, if you need to view content from a few days ago, please go to https://bbs.hcbbs.com/home.php?mod=space&uid=3862647&do=thread&view=me&from=space through the summary post below
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Replace hydrogen with non-hydrogen non-condensable gases to improve the purity of hydrogen in the recycled hydrogen. In the event of a shutdown due to a hydrogen circulation machine failure, the bed temperature of the reactor can still be controlled by releasing waste hydrogen.
Circulating hydrogen contains hydrogen sulfide; discharging waste hydrogen can increase the hydrogen partial pressure
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Emission can be used to control the accumulation of light hydrocarbons in the recycled hydrogen. The accumulation of light hydrocarbons in the circulating hydrogen reduces the partial pressure. At the same time, the exhaust gas can help control the concentrations of ammonia, carbon monoxide, and carbon dioxide in the circulating hydrogen; ammonia is harmful to catalysts, while carbon monoxide and carbon dioxide can react to form methane gas, which increases system pressure and leads to catalyst deactivation.
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Circulating hydrogen contains organic components as well as other impurities such as hydrogen sulfide, CO, CO2, etc. It is necessary to discharge a portion of the circulating hydrogen periodically or irregularly in order to control its purity and increase the hydrogen partial pressure.
Emission can be used to control the accumulation of light hydrocarbons in the recycled hydrogen. The accumulation of light hydrocarbons in the circulating hydrogen reduces the partial pressure. At the same time, the exhaust gas can help control the concentrations of ammonia, carbon monoxide, and carbon dioxide in the circulating hydrogen; ammonia is harmful to catalysts, while carbon monoxide and carbon dioxide can react to form methane gas, which increases system pressure and leads to catalyst deactivation.