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!

*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.

Jobs

NOx formation in thermal Processes

NOx formation in thermal Processes

(OP)
Deart All,

can anyone help me to understand how thermal NOx is formed and if possible to show one example how to calculate the formed thermal NOx in thermal applications and please, also if possbile can you tell me the differences in fuel NOx and prompt NOx formation and to show one example how to estimate their formation in one application.

would be glad for your help.
Thanks,
Reagrds,
Analyzer_008

RE: NOx formation in thermal Processes

Quote:

Can anyone help me to understand how thermal NOx is formed...

I can briefly cover the basics of thermal NOx production from burning pulverized coal at electric generating stations.

To maximize thermal efficiency, pulverized coal is burned at high temperature. This creates ash (both fly ash & bottom ash) plus sulfur compounds (SOx) from ingredients in the coal.

Bottom ash is granular, like sand, and is easily removed from the bottom of the boiler. Often by sluicing with water.

Fly ash is removed from flue gas with electrostatic precipitators or filters (bag houses).

Next, sulfur compounds are removed from the flue gas with "scrubbers" (flue-gas desulfurization - FGD equipment).

During combustion, necessary high temperatures cause atmospheric nitrogen and oxygen to react creating NOx compounds. Note that neither the nitrogen nor the oxygen comes from coal. On a large scale, the best available technology to remove NOx compounds is "Selective Catalytic Reduction" (SCR). Ammonia is introduced into the flue gas (after both ash and SOx compounds have been removed.) In the presence of a catalyst, ammonia reacts with NOx to create nitrogen (N2) and water vapor.

None of this equipment removes 100% of the pollutants, but electrostatic precipators come close for fly ash removal.

www.SlideRuleEra.net idea
www.VacuumTubeEra.net r2d2

RE: NOx formation in thermal Processes

(OP)
Thank you for breif introduction, do you know how the NOx formation dependent on the temperature, I mean higher temperatures means higher NOx, is that right, but can you tell me how it is estimated, assuming I have a flow of waste app. 10000 Nm3/hr (it can be gaseous or liquied waste with no Nitrogen compount in the inlet) and the incineration temperature of app. 1000 °C, in that case can you tell me how much NOx will be formed during incineration, and please, also can you tell me how you estimate it, if you show an exsample calculation I would be very glad.
DO you have any information how SCR is dimensioned, an excell example would be the best , if you have any would be very glad for your help.

thanks in advance a lot.
Regards,

RE: NOx formation in thermal Processes

(OP)
do you have an orginal document of this graph, sen you link me?? and how about SCR do you have any data on that? thanks

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

eBook: Product Innovation Platform Assessment
Over the past few years, there has been growing interest among industrial companies and solutions providers with regards to Product Innovation Platforms, where design, manufacturing and IoT tools are bundled into a single software package. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close