One Question per Day on Synthetic Ammonia (Series 45)

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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 44, 221: To produce water gas with a high content of CO and H2, from the perspective of chemical reaction equilibrium, it should be carried out under （ ） conditions. A. High pressure, low temperature B. Low pressure, high temperature C. Normal pressure, normal temperature D. Low pressure, low temperature 222. In the actual process of producing semi-water gas on an intermittent basis, the main method for increasing the furnace temperature is ( ). A. Increase the amount of steam used. B. Increase the blowing speed and extend the blowing time. C. Extend the circulation time. D. Increase the amount of coal fed into the furnace. 223. In the tannin-based desulfurization process, what is used to oxidize sodium vanadate pentoxide to sodium metavanadate? A. NaHS B. NaVO3 C. Tannin in its oxidized state D. Tannin in its reduced state. 224. The functions of the waste heat boiler in the gas production section do not include the following ( ). A. Recovering the sensible heat of the blowing gas B. Recovering the sensible heat of the top-blown coal gas C. Recovering the sensible heat of the purging gas D. Recovering the sensible heat of the bottom-blown coal gas 225. During intermittent gas production, with all other conditions remaining unchanged, increasing the height of the fuel layer – which of the following statements is incorrect? A. The steam decomposition rate during the gas generation stage increases. B. The CO content in the blowing gas increases. C. The resistance in the fuel layer increases. D. The residence time of water vapor decreases. Answer: BBCDD. Scoring criteria: 3 points for participation, 1 point for each correct answer, and 1 additional point for hiding the answer. It should be specifically noted that, in order to help everyone remember the practice of hiding answers, starting with this daily question, requests will occasionally be made for respondents to hide their answers. If the responder is not hidden, they must participate in scoring. For methods to hide posts, see: http://bbs.hcbbs.com/thread-1551107-1-1.html