Pulverized coal burner

Patent · Thu Jan 01 00:00:00 EST 1998

OSTI ID:871944

Sivy, Jennifer L ^[1]; Rodgers, Larry W ^[2]; Koslosy, John V ^[3]; LaRue, Albert D ^[4]; Kaufman, Keith C ^[2]; Sarv, Hamid ^[2]

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1. Alliance, OH
2. Canton, OH
3. Akron, OH
4. Uniontown, OH

A burner having lower emissions and lower unburned fuel losses by implementing a transition zone in a low NO.sub.x burner. The improved burner includes a pulverized fuel transport nozzle surrounded by the transition zone which shields the central oxygen-lean fuel devolatilization zone from the swirling secondary combustion air. The transition zone acts as a buffer between the primary and the secondary air streams to improve the control of near-burner mixing and flame stability by providing limited recirculation regions between primary and secondary air streams. These limited recirculation regions transport evolved NO.sub.x back towards the oxygen-lean fuel pyrolysis zone for reduction to molecular nitrogen. Alternate embodiments include natural gas and fuel oil firing.

• Research Organization: BABCOCK & WILCOX CO
• DOE Contract Number: AC22-92PC92160
• Assignee: Babcock & Wilcox Company (New Orleans, LA)
• Patent Number(s): US 5829369
• OSTI ID: 871944
• Country of Publication: United States
• Language: English

Related Subjects

pulverized
coal
burner
emissions
unburned
fuel
losses
implementing
transition
zone
improved
transport
nozzle
surrounded
shields
central
oxygen-lean
devolatilization
swirling
secondary
combustion
air
buffer
primary
streams
improve
control
near-burner
mixing
flame
stability
providing
limited
recirculation
regions
evolved
towards
pyrolysis
reduction
molecular
nitrogen
alternate
embodiments
natural
gas
oil
firing
secondary combustion
molecular nitrogen
fuel oil
natural gas
air stream
pulverized coal
combustion air
secondary air
alternate embodiment
lean fuel
pyrolysis zone
pulverized fuel
transition zone
unburned fuel
alternate embodiments
coal burner
air streams
improved burner
devolatilization zone
/110/431/