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This post was last edited by liuquan1100 on 2017-9-19 09:54. [Daily Question No. 261] 2017.09.19 During the shutdown for maintenance of the equipment, the wastewater from purging the equipment should be discharged into the ( ) system. A. Assume it is a water purification system. B. It is an oily wastewater system. C. It is a sulfur-containing wastewater system. D. The reference answers will become visible after the product line is restored; scoring is possible by identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) The answers to the daily activity questions have changed; today’s answers are shown in the subsequent questions. For management purposes, if you need to view content from a few days ago, please go through the summary post below. Summary post of Q&A questions for 2017 (updates have begun): http://bbs.hcbbs.com/thread-1657793-1-1.html. Summary post of daily questions for 2017 (updates have begun): http://bbs.hcbbs.com/thread-1657794-1-1.html. Summary post of Q&A questions for 2016 (updates completed): http://bbs.hcbbs.com/thread-1597792-1-1.html (Source: Haichuan Chemical Industry Forum). [Q&A Question No. 253] September 11, 2017: Leaks in the internal tube bundles of heat exchangers are generally checked using a gas-tightness test method. ( ) Wrong 【Q&A Question 254】 September 12, 2017: A high content of ( ) in fresh hydrogen can easily lead to overheating of the catalyst bed. A. Carbon monoxide B. Sulfur dioxide C. Hydrogen chloride D. Methane A [Question and Answer, Question 255] September 13, 2017 “The main purpose of using hot hydrogen with oil during the shutdown of a hydrogenation unit is ( ).” A. After heating the hydrogen with oil, when the reactor is opened there is no oil or gas present, allowing people to enter. B. Heating the hydrogen with oil ensures that it is safe to carry out major maintenance and welding work on the equipment. C. It removes oil and hydrocarbon deposits from the catalyst. D. It reduces corrosion. “C [Question and Answer No. 256] September 14, 2017” Flue gas caused a failure of the fan; which of the following treatment methods should be carried out first? A. Open the flue gas bypass or open the quick-acting damper. B. Restart the flue gas exhaust fan. C. Disconnect the heat pipe system. D. Close the inlet baffle of the flue gas exhaust fan. A 【Q&A Question 257】 September 15, 2017 » In which of the following situations could a centrifugal compressor experience surge? A. Reduced intake flow rate B. Lowered intake temperature C. Increased flow rate D. All of the above \"A [Question and Answer No. 258] September 16, 2017\" The location where the defoamer is injected is ( ). A. Amine treatment system B. Reaction system C. Fractionation system D. Liquefied hydrogen recovery system \" A [Question and Answer, Question 259] September 17, 2017 \" The pressure control point of the reaction system in the hydrogenation unit is located at ( ). A. Reactor inlet B. Reactor entry C. High-pressure separator D. Low-pressure separator C 【Q&A Question 260】 September 18, 2017 Generally speaking, when the reflux ratio in a distillation column is reduced, the number of theoretical plates required ( ). A. Reduce B. Irrelevant C. Increase D. Unable to determine \"C\"