【Daily Question No. 248】2017.09.06

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This post was last edited by liuquan1100 on 2017-9-6 08:23. [Daily Question No. 248] 2017.09.06: Piston compressors use multi-stage compression to reduce the exhaust temperature. ( ) Check the reference answers after responding; scoring is achieved 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) Answers for September 1, 2017 – September 5, 2017. Increasing the hydrogen pressure in hydrogenation reactions can reduce catalyst coking and maintain the catalyst’s activity; therefore, for hydrogenation reactions, the higher the hydrogen pressure, the better. Yes, on September 2, 2017, the lower the reaction space velocity of the hydrogenation unit, the shorter the contact time between the oil product and the catalyst. Incorrect: On September 3, 2017, the average distillation temperature under actual boiling conditions was referred to as the volume average boiling point of the oil. Wrong: On September 4, 2017, misalignment of the coupling centers or inappropriate clearance of the bearing shells can both cause vibration in the cyclohydrogen compression unit. Yes, the increase in the metal content of the feedstock to the hydrogenation unit on September 5, 2017, could very easily lead to an increase in the pressure drop across the catalyst bed. Yes