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
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
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
www.VacuumTubeEra.net
RE: NOx formation in thermal Processes
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
www.SlideRuleEra.net
www.VacuumTubeEra.net
RE: NOx formation in thermal Processes
RE: NOx formation in thermal Processes
www.SlideRuleEra.net
www.VacuumTubeEra.net