【Purification Daily Question】May 14, 2016
Thread Content
To increase the popularity of the purified area, a \"One Question per Day\" campaign was launched to foster an active atmosphere for technical exchanges while providing members with certain financial rewards. (Fellow sea enthusiasts, if you have any good questions, feel free to send them to me; let’s work together on them.) 【Daily Question】 What are the energy consumptions of the low-temperature methanol washing system? Post your answer as a reply; participating in the quiz earns you +2 wealth points. If you answer all questions correctly, you’ll receive an additional +3 to +8 wealth points. Extra rewards will be given if you provide a thorough analysis and explanation of the questions or answers, including detailed calculation processes. If your answer is correct and your analysis is accurate, it will be marked as the best reply (or the best assistance). Feel free to answer the questions. 1) Nitrogen 2) Steam 3) Pumps, compressors (power consumption) 4) Propylene 5) Heat exchange between the equipment and the surrounding environment
1) All methanol circulation circuits are operating stably; the circulation volume of each pump has been gradually increased to over 50% of the design value, and all automatic regulators are capable of being used for automatic control. 2) The methanol outlet temperature TI04206 at the bottom of the scrubber tower (C04201) has been cooled to -30°C. 4) The methanol moisture content at the bottom of the thermal regeneration tower (C04204) is <1%. 5) The methanol/water separation tower (C04205) is operating stably. 6) The online analysis instruments AIA04211 and AIA04212 are ready for use; they can be put into operation after passing manual analyses three times in a row. 7) The previous system can supply qualified transformed gas properly, with a load of over 40%. 8) The torch pipeline network is in normal operation. 9) The recycle gas compressor (K04201) is ready for operation. Is that the case? I might not know very well, and my understanding might be incorrect; I’ll participate actively in the hope that the original poster can find a better answer. :)
5) Heat exchange between the equipment and the surrounding environment
The energy consumption of the low-temperature methanol washing system mainly includes the following aspects: ① Steam consumption for thermal regeneration and the reboilers in the methanol/water distillation column； , ②The cooling energy required to remove the absorption heat of acidic gases such as CO2 at low temperatures in order to maintain the temperature conditions necessary for absorption; most of this cooling energy is compensated for during the desorption of CO2. However, since part of the CO2 desorption occurs when the solution is heated to a temperature higher than that of the surrounding environment, the utilization rate of the cooling energy during CO2 desorption does not exceed 60–70% ； ③The power consumption required for transporting the methanol absorbent, compressing the recovered gas, and creating a vacuum when necessary: ④ Whether the heat exchange network is properly designed, as well as whether the temperature differences for heat transfer in the heat exchangers are set appropriately, have a significant impact on energy consumption ； ⑤Compensating for the heat lost to the surrounding environment generally accounts for less than 10% of the total energy consumption.
It features low power consumption, low steam consumption, and inexpensive solvents
This post was last edited by zwg2006 on 2016-5-14 19:11: Power consumption (pumps, compressors), water consumption (cooling water), steam consumption, nitrogen consumption (stripping), chemical consumption (propylene, lost methanol), other heat consumption (lost energy)
Nitrogen, steam, power consumption, propylene, and heat loss