Refining Knowledge (Technology) Daily Question (36) 10.30

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This post was last edited by akzo2008 on 2009-10-31 07:56. Everyone is welcome to actively participate in the learning and discussion of professional basic knowledge in the refinery processing technology exchange area! In accordance with the forum’s uniform requirements, the maximum score for this event is 10 Wealth points, and rating charm is prohibited. Friendships and duplicate ratings are also declined. Additionally, for answers using the same IP, only the first post is valid. Be careful when posting; editing is ineffective! Those who have different opinions on the provided answer keys can post discussions the next day; those who provide solutions or their own opinions regarding the daily question’s answer key will receive appropriate rewards! The focus is on participation, and there are prizes for participating! To prevent some members from copying other members’ answers, please hide your posts when answering questions. For specific hiding methods, see: http://bbs.hcbbs.com/viewthread.php?tid=492556&highlight=%D2%FE%B2%D8 Note: Questions on refining knowledge (technology) are being sought on a daily basis; those who want to create such questions can visit: http://bbs.hcbbs.com/thread-553526-1-1.html We hope that participants will take an active role in answering these questions! Multiple-choice question 1: Generally, the inlet linear velocity of the first cyclone in the regenerator is not to exceed 25 m/s; exceeding this value will result in a significant increase in the catalyst consumption per unit volume of product. A. 20m/s B. 25m/s C. 30m/s D. 35m/s 2. The third-stage centrifuge can further remove the catalyst from the flue gas, ensuring that the dust concentration in the flue gas at the inlet of the flue gas processor is no more than ( ) mg/Nm3. A. 100 B. 150 C. 200 D. 250 3. The vanadium products not only cover the surface of the catalyst, reducing the number of active sites, but they also weaken the structure of the catalyst carrier, thereby decreasing the catalyst’s (). A. Microreactivity B. Selectivity C. Thermal stability D. Wear resistance 4. The riser reactor in a catalytic cracking unit operates under （） fluidization. A. Bubble bed B. Turbulent bed C. Rapid bed D. Pneumatic bed 5. The sliding coefficient is related to the system; it increases as the gas velocity and the solid mass flow rate increase. A. Increase B. Remain unchanged C. Decrease D. Unable to determine. True or False questions: 1. After pressing the handle of the emergency shutdown device, the quick shut-off valve, the regulator valve, and the steam extraction quick shut-off valve should close immediately. （） 2. The test of the quick-shut valve testing device is one of the static test items for the turbine safety system. （） 3. The characteristic of a damaged internal heat transfer tube is that both the base material and the weld are damaged, with more defects occurring in the weld area. （） 4. The test of the emergency cut-off device must be carried out only after the test of the manual emergency protection device has been successful. （） 5. When a device has a large and constant heat load that needs to be removed, installing coils in the regenerator allows the excess heat to be taken away; an internal heat extractor can be used for this purpose. () Multiple-choice and true/false questions, 10 questions per day; 1 unit of wealth for each correct answer. Note: The answers will be released at least 16 hours later, and scoring will be given after they are published. No further scoring will be conducted for those who respond after the answers are made available. Answer: cccdc yynyy