tertiary air in boiler

Smoke reduction.

hi pwslack.... thnx for sharing ur answer but i think we can increase the primary air ratio for smoke reduction.... so, why we use tertiary air?? plz explain

Primary air is to carry the coal (assuming it is the coal fired boiler you mean). It jas got a limited quantity range based on the coal quantity.

providing the total air through primary (the tertiary may reach as large as 6-7 times primary) will affect the coal distribution, pulveriser capacity and to top it there will be excessive velocity and hence significant rise in wear on the areas exposed- mill, pf pipes, bends,nozzle,...

dear Guest, I've just started working on coal-fired boiler since we are running out of gas. Can you please e-mail me any article/writeup on this, such that at time of purchase i can put this up with the Boiler manufacturers. My email is : duconems@yahoo.com

thanks

Sorry, I mill man. The boiler is made at another place. Our scope ends just before nozzle.

So have the working knowledge of boiler (must bave seen my concentration on answer )

GA PWSlack and of the third order..... primary, secondary and tertiary