×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Gas Radiation

Gas Radiation

Gas Radiation

(OP)
Hi,

I'm trying to find the gas emissivity of flue gas in a combustion chamber of a power station.  I know that there are many text books that give three graphs to determine the effects of CO2 and H2O...but I prefer to go the long way i.e. spectral analysis for I find that the tolerance on the graphs is too low.  
I am currently struggling Wideband-Model section. Not so much the theory, but the MATH!!
My question is: Has anyone performed some math manipulation for the overlapping parameters of the various gasses? Help will be greatly appreciated.

Thanx and take care

Philip Oosthuizen
Company info:
SteinMuller Engineering Services
http://www.steinmuller.co.za/

RE: Gas Radiation

I would recommend you use the "russian normative method" as proposed by A G Blockh in "heat transfer in steam boiler furnaces". The math is developed , and condensed to a simpler correlation ,that is easily correlated and adjusted with test data from other  furnaces that are already burning the same coal

Flyash dispersion in the furnace, combined with slag reflectivity, is a complex problem- a so called participating medium. The main problem is that there is no reliable database of the compelx index of refraction for suspended flyash particles, as a function of size distribution, shape, mineral matter. To add more complexity, the ash distribution , size, shape etc is changing as the char combusts. For australian coals, and US low sulphur subbit coals, the high levels of dielectric dolomites Ca and Mg act as IR scatterers- very complicated.

also, check some 1990- 2000  papers by B+W Woodrow Fiveland - he has published 3d CFD papers that include his mathematical devolution of these ash properties. What I foudn interesting was the way he managed to conform the radiation transfer equation to a form amenable to the galerkin method.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources