Ethylene Plant Knowledge (Technology) Questions 12.28

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This post was last edited by yanran88 on 2009-12-28 at 17:59. Questions on knowledge (technology) of ethylene plants – 12/28. 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. The operating rate of a single pyrolysis furnace refers to the ratio of the actual number of operating days per year to the designed number of operating days per year. 2. The moisture in the carbon dioxide fraction obtained after the separation of the pyrolysis gas comes from the moisture that was not removed from the crude hydrogen. 3. According to thermodynamics, the equilibrium constant for catalytic hydrogenation reactions increases as the temperature rises; therefore, increasing the temperature is favorable for the reaction equilibrium. However, excessively high temperatures can easily lead to overheating, so the reaction temperature must be selected appropriately. 4. The isothermal efficiency indicates the degree to which the actual compression process approaches an isothermal process; the closer it is to an isothermal process, the lower the isothermal efficiency. 5. The principle of a heat pump is to combine a distillation tower with a refrigeration cycle, in order to transfer heat from the low-temperature area at the top of the tower to the high-temperature area at the bottom of the tower. 6. A demethanization system that employs fractional distillation separator technology will increase the investment in the three reactors, the deethanizer tower, and other equipment. 7. If the ethylene tower and the ethylene refrigeration unit form an open-loop heat pump, then as the pressure in the ethylene distillation tower decreases, the power consumption of the heat pump compressor will decrease, thereby increasing the energy-saving efficiency of the heat pump system. 8. A heat pump system composed of a distillation tower and a refrigeration cycle does not require external energy input, as the cooling capacity at the top of the tower comes from the bottom of the tower, and the heat from the bottom of the tower comes from the top of the tower. 9. Under pressurized conditions, the temperature at which water and hydrocarbons form hydrates is lower than the temperature at which water freezes; therefore, the formation temperature of hydrates becomes a constraint on the cooling of the pyrolysis gas at the outlet of the pyrolysis gas compressor. 10.3A。 Molecular sieves retain a high adsorption capacity even at very low relative humidity. Below 100°C, the adsorption capacity of molecular sieves is not affected by temperature. Answer: 1 (×) is defined as the ratio of the number of operating days (operating cycle) to the sum of the operating days and the coking maintenance days. 2 (×) Water formed by the hydrogenation of carbon monoxide entrained in the crude hydrogen during carbonyl hydrogenation, and of some of the primary oxygen entrained in the pyrolysis gas. 3 (×) decreases, so lowering the temperature is favorable for the reaction equilibrium. 4 (×) The higher the efficiency. 5 (√). 6（×） can be saved. 7 (×) Pressure increases; 8 (×) However, heat does not transfer automatically from a colder object to a hotter one, so external work is required to act on the system. 9 (×) The temperature is much higher. 10 (×) The adsorption capacity of molecular sieves is less affected by temperature.