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szymanski
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Join Date: Jan 2013
Posts: 3

What Happened In A Coal Boiler If You Use The "EGR" Like In Diesel Car.

01/03/2013 11:41 AM

Hello everybody,

It is my first question here so sorry if I don't use the right protocol.

In modern Diesel car all engines use a "EGR" exhaust gas recirculation to decrease the NOx and particulates emissions. Approximatively the exhaust gas have two utilities : Decrease the amont of oxygen in the chamber and decrease the combustion temperature. These advantgaes have impact directly on thermal NOx mostly produced during Diesel combustion.

I would like to know if someone have a good idea of what happend if you mix exhaust gas and fresh air in a coal boiler using pulverized burners.

On one hand the thermal NOx will decrease but on the other hand what happend to the Fuel NOx ? stay stable, Increase and so lead to a negative impact of the EGR phenomena ?

Thanks a lot for your answers.

Merry Xmas to you.

Pierre
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Pathfinder Tags: EGR coal boiler NOx
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Fredski
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Join Date: Feb 2011
Posts: 7025
Good Answers: 207
#1

Re: What happend in a coal boiler if you use the "EGR" like in Diesel car.

01/03/2013 11:50 AM

what are you looking for? less emissions?
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RAMConsult
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Engineering Fields - Power Engineering - New Member

Join Date: May 2007
Location: NYC metropolitan area.
Posts: 3230
Good Answers: 444
#2

Re: What Happened In A Coal Boiler If You Use The "EGR" Like In Diesel Car.

01/03/2013 12:50 PM

It's been done for years, here's just one example:

http://www.genesyscombustion.com/whitepages-417.pdf

Google on Boiler EGR for much more info.

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MJCronin
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Join Date: Oct 2009
Location: Central Midwest
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#3
In reply to #2

Re: What Happened In A Coal Boiler If You Use The "EGR" Like In Diesel Car.

01/03/2013 1:39 PM

For boilers, the technique is called "Flue gas Recirculation". It is a method to reduce NOx and may be combined with low NOx Burners

In smaller boilers, the system typically recirculates a portion of the flue gas back to the windbox. A fan may be required for an assist. New dampers are needed.

The system should be designed by the boiler vendor as the new configuration has a different flame path and operating temperature

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szymanski
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Join Date: Jan 2013
Posts: 3
#4

Re: What Happened In A Coal Boiler If You Use The "EGR" Like In Diesel Car.

01/07/2013 3:07 AM

Thank for all your answer.

I didn't know the right term but now it's OK.

Have a good day.
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