In PROII, how should I configure it after connecting the reboiler at the bottom of the tower to a simple heat exchanger? ?
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In PROII, how should I configure it after connecting the reboiler at the bottom of the tower to a simple heat exchanger? ? The tower has converged, and a simple heat exchanger has been connected to the tower! The inlet stream of the simple heat exchanger has its composition, temperature, pressure, and flow rate specified. For simple heat exchangers, it is still necessary to specify the pressure drop and the temperature of the outlet stream. However, in principle, the heating load of the reboiler in the tower has already been taken into account, so there is no need to specify the outlet stream temperature. Yet if this parameter is not entered, an error message is displayed; when it is entered, the message reads “1 error(s), 0 warning(s), and 0 message(s) detected: *** error *** Unit 2, ‘t1’ – the duty on heater ‘1’ cannot be varied because it has been specified by a heat exchanger – unit # ‘5’. Experts, how can this issue be resolved?
It’s not that the temperature of the outlet stream cannot be set; it’s connected to the tower. What matters is that for this simple heat exchanger, the parameters related to the heat transfer medium and the heat load have already been determined, but the relevant parameters for the other stream still need to be fully specified.
But once it’s set, an error occurs. Logically, that shouldn’t happen. It’s confusing, haha
The last edit to this post was made by haimesa on 2012-5-9 at 08:40. In the Column Specifications and Variables section of the tower, by removing the reboiler heat load from the variables and keeping only the heat load of the top condenser, it becomes possible to enter the exit temperature of the reboiler heat stream at that simple heat exchanger you have connected.
Haha, thanks. I see now – there’s an option for the outlet temperature that allows the software to calculate the reboiler load itself. Haha, thank you!