Issues regarding the SRK equation for simulating condensers in pro2
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When simulating PRO2 and choosing the SRK equation, it is necessary to specify that water (H2O) is removed from the condenser. Why? In practice, how is this water removed to ensure that the water content of the output meets the required standards? This post was last edited by suiran983527 on 2009-2-11 16:43.]
It seems like it’s not necessary. I’ve studied up to this point without ever encountering this problem; I would appreciate some guidance from those who know more
I recall having seen such a practical treatment method before: the vapor at the top of the tower is led out, condensed and separated in a condenser; the non-aqueous portion is recycled, while the water is separated by decantation and then discharged. It should be used more in water-hydrocarbon separation processes; it has not yet been applied in practice.
If it is for flash evaporation, it is not necessary. If it refers to tower calculation, then it is necessary when using the (INSIDE-OUT) method. It is also required if (SURE and Vapor-Liquid-Water) are chosen.
In practice, as described on the 4th floor, the parameters in the SRK equation are fitted using experimental data on common hydrocarbons; therefore, they are not applicable to polar components such as water.
First, determine whether you consider water as an effluent phase in the SRK equation or treat it as a single phase. If water is treated as an effluent phase, then regardless of the tower calculation algorithm chosen, if the algorithm assumes a vapor-liquid phase separation, it will be necessary to add a stream at the top of the tower, treating this stream as the aqueous phase; in practice, however, this stream usually does not have any actual flow rate. This problem would not arise if water were not treated as a single phase. When performing tower calculations, special attention must be paid to this issue when water is present in the feed components, as tower calculations generally use the iO algorithm for V-L two-phase systems. This is related to many equations, such as SRK, PR, etc. Except for equations like SRKM and NRTL, there is no option for segregated water.
First, determine whether you consider water as an effluent phase in the SRK equation or treat it as a single phase. If water is treated as an effluent phase, then regardless of the tower calculation algorithm chosen, if the algorithm assumes a vapor-liquid phase separation, it will be necessary to add a stream at the top of the tower, treating this stream as the aqueous phase; in practice, however, this stream usually does not have any actual flow rate. This problem would not arise if water were not treated as a single phase. When performing tower calculations, special attention must be paid to this issue when water is present in the feed components, as tower calculations generally use the iO algorithm for V-L two-phase systems. This is related to many equations, such as SRK, PR, etc. Except for equations like SRKM and NRTL, there is no option for segregated water.