Regarding the issue of inverted temperature in the absorption tower
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HSYS simulation was used to study the absorption of benzene from non-condensable gases (mainly ethane, methane, and hydrogen) using diethylbenzene as the absorbent. The absorbent entered at the top of the tower, at the first tray, at 40°C, while the benzene-containing condensed oil entered at the bottom of the tower at 105°C, and the non-condensable gases entered at 40°C. Under actual operating conditions, the temperature at the top of the tower is 50°C, and at the bottom it is 71°C. Why does the simulation show an inverted temperature profile, with the top of the tower never dropping below 68°C? What’s the reason for this? Changing various property sets doesn’t help either.
Check whether the thermodynamic methods used in the upstream unit modules for each feed stream to the absorption tower are exactly the same as those used in the absorption tower module. If there is any inconsistency, a simple heat exchanger module should be added before the material enters the tower in order to reset the thermodynamic calculations, making them exactly the same as those of the absorption tower module.
Thank you so much; the property packages are all the same. It was the two feed streams at the bottom of the tower that were mixed up. Either it should be combined before entering the bottom of the tower, or the hot stream should enter the last tray while the cold stream enters the tower bottom. Previously, the cold stream was directed to the last tray, while the hot stream went into the reactor bottom. Additionally, regarding the problems encountered in aromatic hydrocarbon simulation, the Institute of Rock and Mineral Sciences really refused to provide the binary phase equilibrium data. . . .