CO-shift converter simulation

[ksb137]

I am trying to simulate a Hydrogen plant in Aspen Plus
11.1. For shift converters I use the equilibrium reactor
module of Aspen Plus. The problem is that I have to state
the reactor outlet temperature in order to have the conversion while other process simulators use the inlet
temperature and they add the heat of reaction (exothermic)
in order to predict the outlet temperature of the ractor
(adiabatic). Does anyone know how this can be done with
Aspen Plus?

 

[phex]

i checked this and found in the online help:

"You must specify the reaction stoichiometry and the reactor conditions. If no additional specifications are given, REquil assumes that the reactions will reach equilibrium.

REquil calculates equilibrium constants from the Gibbs energy. You can restrict the equilibrium by specifying one of the following:

·The molar extent for any reaction

·A temperature approach to chemical equilibrium (for any reaction)

If you specify temperature approach, DT, REquil evaluates the chemical equilibrium constant at T + DT, where T is the reactor temperature (specified or calculated).

REquil performs single-phase property calculations or two-phase flash calculations nested inside a chemical equilibrium loop. REquil cannot perform three-phase calculations."

the temperature you have to enter in the data browser seems to be inlet temp, not outlet temp, or am I mistaken?

 

[phex]

s/seems to be/can also be

 

[ksb137]

Thanks phex for the reply.

I have read all these but the problem is that if I
specify the inlet temperature then the outlet temperature
equals the inlet and it seems that the only thing that
the module does is the prediction of the outlet stream
composition based on minimization of free Gibbs energy.
It does not take into account temperature increase due
to the exotherm of the reaction.
In other process simulators e.g CHEMCAD both outlet composition and temperature increase are given in the
outlet of the Requil reactor.