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This post was last edited by 955559 on 2017-7-21 at 22:36. [Daily Question No. 098] April 8, 2017: Before the conversion system has completed the introduction of hydrogen and steam, in order to prevent carbon deposition on the conversion catalyst, it is prohibited to ( ). A. Allow steam to enter the conversion furnace B. Allow hydrogen to enter the conversion furnace C. Allow hydrocarbons to enter the conversion furnace D. Allow nitrogen to enter the conversion furnace. The reference answers can be seen after responding; points will be awarded for identifying the correct key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) C 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 Saving” Campaign (Sponsors sought; highest returns ever) http://bbs.hcbbs.com/thread-1666758-1-1.html Sponsors are being sought for this campaign; those interested may contact the campaign coordinator. (Sponsors of the event are entitled to the policy allowing them to include promotional advertisements in various events held in the petrochemical region for one year.) The Petrochemical Deep Processing Edition – the event to share pictures of chemical processing equipment has begun! A vast amount of wealth, along with HChuan coins, is waiting for you to claim it: http://bbs.hcbbs.com/thread-1760733-1-1.html. Notice regarding the collection of chemical engineering technical materials in the “Petroleum and Chemicals Section”: http://bbs.hcbbs.com/thread-1614796-1-1.html (Source: HChuan Chemical Forum)