1 reply to this topic

[alan9]

Dear All

I am currently doing a simulation of Water Gas Shift (WGS) reactor in HYSYS and have met with some problems with entering the kinetic data into HYSYS. I have used a PFR to simulate the packed bed reactor together with a kinetic type reaction.

In HYSYS, under the "Parameters" tab of keying in the reaction data, the kinetic data of the forward and reverse reaction has to be keyed in.
The forward reaction in HYSYS is given as k = A * exp{ -E/RT }*T^β
and the backward reaction in HYSYS is given as k' = A' * exp{ -E'/RT }*T^β'
The parameters that I have to key in are A, A', E, E', β and β'.

From literature, the kinetics of the reaction given are always the Keq and expression for the forward reaction rate. For example, for the water-gas-shift reaction,
K_eq = exp (4577.8/T - 4.33) and r_CO = 2.96*10⁵*exp{ -47400/RT }*(P_coP_H20 - P_CO2P_H2/K_e)
From these expressions, I can determine the expression for the backward reaction and as such I can determine the parameters A, A', E, E' to be keyed into HYSYS. However, I am unable to manipulate the form of the kinetic equations given in literature into one that allows me to have the term T^β, thus I am not able to key in the parameters β and β'.

I would like to ask what is the significance of β and β', from what I understand it should account for the temperature dependency of the reaction. Is this temperature dependency already accounted for in the K_eq given in literature such that I can ignore keying in values for β and β'?

I would kindly appreciate if anyone could help me in this. Thank you.

Best Regards
Alan

[Padmakar Katre]

Dear All

I am currently doing a simulation of Water Gas Shift (WGS) reactor in HYSYS and have met with some problems with entering the kinetic data into HYSYS. I have used a PFR to simulate the packed bed reactor together with a kinetic type reaction.

In HYSYS, under the "Parameters" tab of keying in the reaction data, the kinetic data of the forward and reverse reaction has to be keyed in.
The forward reaction in HYSYS is given as k = A * exp{ -E/RT }*T^β
and the backward reaction in HYSYS is given as k' = A' * exp{ -E'/RT }*T^β'
The parameters that I have to key in are A, A', E, E', β and β'.

From literature, the kinetics of the reaction given are always the Keq and expression for the forward reaction rate. For example, for the water-gas-shift reaction,
K_eq = exp (4577.8/T - 4.33) and r_CO = 2.96*10⁵*exp{ -47400/RT }*(P_coP_H20 - P_CO2P_H2/K_e)
From these expressions, I can determine the expression for the backward reaction and as such I can determine the parameters A, A', E, E' to be keyed into HYSYS. However, I am unable to manipulate the form of the kinetic equations given in literature into one that allows me to have the term T^β, thus I am not able to key in the parameters β and β'.

I would like to ask what is the significance of β and β', from what I understand it should account for the temperature dependency of the reaction. Is this temperature dependency already accounted for in the K_eq given in literature such that I can ignore keying in values for β and β'?

I would kindly appreciate if anyone could help me in this. Thank you.

Best Regards
Alan

Dear,
Just check the water gas shift reaction is in the Hysys reactions library, only what you need is to select the reaction rather configuring in the reactions tab of Hysys simulations basis manager.