Simulation of a Plug Flow Reactor

[arvind.prasad]

In the Plug Flow reactor Edit menu, under packings, and sub section empty bed we have a text box to enter the Wall dimension. I have gone through the help file but am not so sure, if the information to be supplied is the wall diameter or the wall thickness? How will wall thickness affect the calculations? Also, the wall diameter will always be equal to the reactor diameter for an empty bed. This information is already supplied in the edit> reactor > Reactor Diameter text box.

[jasper]

The label in front of the edit field is a bit too short and truncates the second word. I corrected the layout for the next update. The word is "wall roughness". It is parameter 'e' in the Colebrook equation:

[arvind.prasad]

Dear Jasper,
The attached flowsheet is simulation of PFR for methanol synthesis from CO,CO2 and H2O. The wall heat transfer coefficient and tube heat transfer coefficient have been set to zero. On running the simulation, it is found that the enthalpyF balance is not zero. Can you explain this? I guess it should be zero.

[jasper]

Thank you for reporting that. For the heat balance, the inert component flow was not taken into account for the d xi / dl term.

The issue is fixed now - fix is available via CUP. In your case it makes a big difference on the enthalpy balance.

[arvind.prasad]

Thanks for the update. Now it is working fine.

[arvind.prasad]

Please find the attached flowsheet. I have connected the energy stream to the PFR, and selected tube heat duty option. The energy stream shows incorrect value of the heat to be removed from the reactor. Also the heat balance of the reactor shows that the reactor is working adiabatically.

[jasper]

[arvind.prasad]

Thanks for the clarification.
Regards