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This post was last edited by liuquan1100 on 2017-7-30 08:12. [Daily Question No. 211] 2017.07.30: Among the following options, which one can improve the thermal efficiency of a heating furnace? ( ) A. Ensure complete combustion of the fuel. B. Increase the exhaust temperature of the heating furnace. C. Increase the excess air coefficient. D. Open the large air valves. The reference answers can be seen after responding; scoring is possible by identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Scoring criteria: 2 Wealth points for incorrect answers; *incomplete* answers score 3–8 points. 10 Wealth points are awarded for correct answers, while those that are correct along with a detailed explanation receive 15–20 Wealth points. Please use these criteria for scoring. Note: If there are editing records after answering, only those who participated will be credited points. For continuous malicious spamming, 2 points will be deducted each time, with no upper limit. Pure numbers, pure emojis, or random letters unrelated to the answer are all considered malicious spamming; points will start to be deducted after three warnings. 2017 Q&A Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (updates completed) http://bbs.hcbbs.com/thread-1597792-1-1.html Petrochemical Sector – “Creative Ideas for Energy Savings” campaign (the second phase is in full swing) http://bbs.hcbbs.com/thread-1666758-1-1.html (Source: Haichuan Chemical Industry Forum Website)