Furnaces – Process – Treating fuel constituent or combustion product
Patent
1999-07-21
2000-12-05
Lazarus, Ira S.
Furnaces
Process
Treating fuel constituent or combustion product
110147, 110188, 110234, 110297, 122 70, F23B 502, F23B 700, F23N 518
Patent
active
06155183&
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. 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. The burner tips extend into the central core of each windbox and mixes with the incoming secondary air to provide for the fuel rich mixture.
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
patent: 5546874 (1996-08-01), Breen et al.
patent: 5694869 (1997-12-01), Breen et al.
patent: 5771823 (1998-06-01), Vierstra et al.
Letcavits John J.
Vierstra Scott A.
A E P Resources Service Company
Ciric Ljiljana V.
Lazarus Ira S.
LandOfFree
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.
Profile ID: LFUS-PAI-O-951198