Method and apparatus for reducing NO.sub.x emissions from a mult

Details Method and apparatus for reducing NO.sub.x emissions from a mult Method and apparatus for reducing NO.sub.x emissions from a mult

1996-01-31

1998-06-30

Yeung, James C

Furnaces

Process

Burning pulverized fuel

110345, F23D 100, F23J 300

Patent

active

057718237

ABSTRACT:
A method and apparatus retrofitted to a multiple-intertube pulverized-coal burner to reduce NO.sub.x emissions of roof fired boilers. An internal two stage process controls the amount of secondary air which flows to the burner. The first stage includes a secondary air damper and air flow station to regulate the amount of air which flows into a windbox of the burner. A baffle plate assembly which includes a plurality of baffle plates further limits the amount of air which flows to the core of the burner for combustion of the fuel. The baffle plates create a pressure drop within the windbox which forces or diverts a quantity of air to the periphery of the burner. The second stage includes an outlet formed in the hot primary air duct, an air plenum which communicates therewith, and a plurality of interjectory air ports which correspond with the burners in number and position along a front wall of the boiler and which communicate with the air plenum. The interjectory air ports inject interjectory air into a combustion chamber of the boiler at a substantially 90 degree angle to the direction of a plurality of burner tips of each burner and supplies the balance of the required theoretical combustion air needed to complete combustion of the fuel. A plurality of probes measure the amount of primary air, secondary air and interjectory air and signal a command loop circuit to adjust the secondary air dampers and interjectory air ports accordingly.

REFERENCES:
patent: 2397793 (1946-04-01), Leach
patent: 3781162 (1973-12-01), Rudd et al.
patent: 3788796 (1974-01-01), Krippene et al.
patent: 4654001 (1987-03-01), LaRue
patent: 4655148 (1987-04-01), Winship
patent: 4669398 (1987-06-01), Takahashi et al.
patent: 4748919 (1988-06-01), Campobenedetto et al.
patent: 4907962 (1990-03-01), Azuhata et al.
patent: 5078064 (1992-01-01), Breen et al.
patent: 5199355 (1993-04-01), LaRue
patent: 5205226 (1993-04-01), Kitto, Jr. et al.
patent: 5329866 (1994-07-01), LaRue
patent: 5417564 (1995-05-01), Briggs

Affiliated with

Also associated with

Rating

Method and apparatus for reducing NO.sub.x emissions from a mult does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for reducing NO.sub.x emissions from a mult, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for reducing NO.sub.x emissions from a mult will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1849177