5 replies to this topic

[aider94]

Dear Everyone,

I have to design simuation of crude gas combusion in gas boiler. I`m working on PRO/II ver.10, this program not contains such device. Is there anyone who know how to pass this problem? 

My idea is to see how much energy I can gain by combusting crude gas, and see how much CO2 is produced during combustion (emission).
 

Edited by aider94, 16 June 2017 - 06:32 AM.

[Mahdi1980]

I encourage you to use the Aspen Fired heater to develop your case.

[aider94]

Thanks for the reply, but I do not have acces to Aspen program, I have Pro/II or Chemcad licenses only in work. Is there any way to pass this on my Pro/II or CC? 

[Saml]

Most simulators have energy of formation on compounds. So heat of reaction would be calculated. No simulator (as far I know) has a "burner" model, you have to feed an air stream , not the pseudocomponent "air" but N2, O2, Ar and  H2O and CO2 (it is important that these two components are declared) and your fuel stream.

 

With Aspen (and probably with other simulators) you have several options. The two I have tried are:

- Set up a Gibbs reactor. It redistributes the atoms between the declared substances to minimize free energy at the outlet temperature. This yields the combustion products except for the nitrogen oxides.

- Declare the combustion reaction for every fuel component, and set up a reactor with conversion on each reaction.

 

You wil have to vary the fuel or air flow in both cases to meet the excess oxygen.

 

All of this assumes that you know the temperature on each section of our equipment and that you only want to analyze how much heat will be released.

 

Now, if your intent is to calculate the heat exchanged on radiant and convection sections, you will need a specialized software, like Aspen Fired Heater, or the BEST combo: Books, Excel, Simulator and Time. :-)

Edited by Saml, 19 June 2017 - 10:49 PM.

[serra]

since you ask how to model a fired heater with a simulator possibly you are not an expert in this area...

a short description of the item

http://www.tulsaheat...ers (rev00).pdf

as suggested by Sami you can simulate combustion reactions (with your simulator, Excel or similar tools),
this document shows an example with Excel (I have a similar template for Prode Properties but you can adapt the procedure to work with any simulator..)


http://cdmbuntu.lib....lename/2062.pdf


Heat transfer can be estimated with a few correlations, see for example


http://www.ijettjour...TT-V4I2P215.pdf

if you have access to tools as HTRI it includes API 560 procedure...
finally, do not forget that manufacturers can verify your specs, validate values and optimize the project...

[aider94]

@Saml @serra

Im still learning about process design and simulation programs, its been about 2 months since my first Pro/II launch. 

I'm very appreciate your help, thanks for advices, now I`ll try to follow your instructions