【Daily Question】Hydrogen production and hydrogenation technology version 20190802
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Participation prize: 1 Fortune, Correct answer prize: 3 Fortune. Single-choice question: If channeling occurs in the catalyst of the reaction bed, it will cause the bed temperature to ( ). A. Experience a significant increase in temperature ； B. Results in a larger radial temperature rise ； C、Large fluctuations ； D. Difficult to control. Answer: B Your participation is the greatest support for our work! Giving roses to others leaves a pleasant fragrance in one’s own hands.
B Due to defects in catalyst packing, a certain area of the bed has a low packing density, causing the catalyst to form a loose, bridged structure; as the oil-gas mixture passes through the bed, it takes a shortcut, which is what is known as \"channeling\". When channeling occurs in the catalyst bed, the most obvious sign is a large radial temperature difference within the bed, along with the presence of hot spots. The higher the reaction temperature, the higher these hot spot temperatures become. Cooling the hydrogen supply for a short period has little effect on these hot spot temperatures; only when the temperature of the entire reactor bed decreases can these hot spot temperatures gradually drop. Gouging in the catalyst bed has the following hazards: ① It causes localized excessive reaction of the catalyst, resulting in an uneven temperature distribution in the bed ； ②This results in insufficient utilization of the overall catalyst activity ； ③Partial catalyst deactivation intensifies ； ④This leads to severe localized coking of the catalyst.
B. Results in a larger radial temperature rise；
B. Results in a larger radial temperature rise