One Question per Day on Synthetic Ammonia (Series 40)

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Since tomorrow is Sunday, I’m posting the daily question ahead of time today! I. Multiple-choice questions (each question has 4 options, of which only 1 is correct; fill in the correct option in the brackets). Continuing from Series 39, question 196: During the gas production stage, whenever there is a change between upper and lower blowing modes, the steam valve should be adjusted to be somewhat ( ) more sensitive than the nitrogen-air valve, in order to prevent explosions that may occur when nitrogen-air meets semi-water gas, as well as to avoid an increase in the oxygen content in the semi-water gas. A. Open late and close early B. Open early and close late C. Open simultaneously D. Close simultaneously 197. As the pressure for ammonia synthesis increases, the compression power consumption for fresh hydrogen and nitrogen ( ). A. Increase B. Decrease C. Remain unchanged D. Irrelevant 198. If air is used as the vaporization agent, the lower part of the vaporization zone is called the ( ) layer. A. Reduction B. Carbonization C. Oxidation D. Drying 199. The low-temperature methanol process for carbon removal belongs to ( ). A. Chemical absorption method B. Physical absorption method C. Physicochemical absorption method D. None of the above. 200. When activated carbon is used for desulfurization, it plays a ( ) role. A. Oxidation B. Reduction C. Catalysis D. Adsorption and catalysis Answer: B A C B D Scoring: A minimum of 3 points; 1 point is added for each correct answer, with an additional 1 point for a completely correct response.