Ethylene Plant Knowledge (Technology) Test Questions, January 9, 2010

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This post was last edited by lijianhuai on 2012-10-5 09:49. Questions on knowledge (technology) of ethylene plants, January 9, 2010. Everyone is welcome to actively participate in the learning and discussion of professional basic knowledge in the petrochemical technology exchange area! At the same time, I hope other moderators will also participate in this activity, taking turns to come up with questions and discuss various sets of devices! Let’s work together to promote the development of the petrochemical technology exchange zone! The maximum score for this activity is 20 Wealth points. Friendly votes and repeated votes are not allowed; please be careful when posting. Posts that are edited will not be counted as valid votes! Those who have different opinions regarding the suggested answers can post discussions the next day, and those who provide solutions or their own opinions on the daily questions will receive appropriate rewards! The focus is on participation, and there are prizes for participating! To prevent the answers of some members from affecting others, please hide your posts when answering questions. Thank you for your cooperation. For specific hiding methods, see: http://bbs.hcbbs.com/viewthread.php?tid=492556&highlight=%D2%FE%B2%D8 Thank you all for your participation! Learn more*, communicate more, gain more! True or False: 1. In ethylene plants, cooling water is an important cooling medium. 2. Fluctuations in the cooling water system of the ethylene plant have a significant impact on the production capacity; in severe cases, this not only reduces the production capacity but may also force some of the product to be burned off. 3. One of the reasons that may cause malfunction in the interlock circuit of the propylene compressor is external signal interference. 4. The reasons for the malfunction of the propylene compressor interlock circuit include unstable liquid level in the first-stage suction tank, which triggers the high liquid level interlock. 5. There are many reasons for the malfunction of interlock circuits; these include factors inherent to the interlock circuits themselves, as well as interference from external signals. 6. Combustion requires the presence of a fuel, an oxidizer, and a heat source simultaneously. In chemical production, raw materials and products are characterized by being flammable, explosive, and volatile. Due to limitations in equipment and operating conditions, these combustible substances can spread into the atmosphere. Therefore, controlling and eliminating fire sources is key. 7. The shutdown of the motor due to overload caused by excessive current is an electrical system failure accident. 8. Arc ignition and combustion resulting from damage to the cable insulation, which leads to the shutdown of the motor, is considered an electrical system failure accident. 9. Poor sealing of the cable junction box, which allows moisture to enter and cause a short circuit, leading to the motor stopping, is considered an electrical system failure. 10. In normal production, the ultra-high pressure steam is mainly supplied by the waste heat boiler of the cracking furnace, with any shortfall being made up by the start-up boiler. Reference answers: 1. (√), 2. (√), 3. (√), 4. (×) Reasons for the operation of the interlock circuit; 5. (√), 6. (√), 7. (×) The shutdown caused by motor overload is a safety protection measure in the electrical system. 8 (√), 9 (√), 10 (√)