Rapid Mix Burner™ [Patented] Case Study 105
TODD Ultra Low Emissions
Burner Installation
The Situation
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Fig. 1
|
In the summer of 1996, a new 230,000 lb/hr
Nebraska boiler at a paper plant in Staten Island,
NY, was supplied with a TODD Combustion®
Dual Rapid Mix Burner (D-RMB) utilizing induced Flue
Gas Recirculation (FGR). The D-RMB was selected
to meet the specified NOx and CO limits of 0.011
lb/MMBtu (approximately 9 ppm) on natural gas
firing. For this unit, TODD provided the burner,
windbox and fuel trains for gas and oil.
The Boiler
A natural gas and No. 2 oil fired, 272 MMBtu/hr
D-RMB was installed on a Nebraska 'A' type package
watertube boiler rated for 230,000 lb/hr steam flow
and equipped with an economizer. The TODD Combustion Group supplied
one dual fuel D-RMB, an insulated windbox
with baffles to provide uniform combustion air
distribution, main and ignitor gas valve trains, a No.
2 fuel oil valve train, and an atomizing steam valve
train. A fully metered, cross-limited control system
and PLC-based Burner Management Systems were
both provided by others.
The TODD Result
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| Fig. 2: Emissions Data |
Fig. 2 illustrates the NOx results over the load
range as obtained by a Continuous Emissions
Monitoring System (CEMS). The NOx ranged
between 7 and 8 ppm across the load range. The
excess 02 varied from about 5% at a minimum load to
3% at full load. FGR rates ranged between 30% and
35%. The CO emissions varied between 0 ppm and 9
ppm. The CO and NOx numbers are corrected
to 3% O2.
Field Test Data
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| Load % |
O2% |
CO ppm |
NOx ppm |
|
| 20 |
4.8 |
2 |
8 |
|
| 50 |
3.5 |
3 |
7 |
|
| 90 |
3.4 |
6 |
7 |
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