40753 REI Netl SCR Workshop 1003 (1)

7/30/2019 40753 REI Netl SCR Workshop 1003 (1)

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Improved RRI PerformanceImproved RRI Performance

for NOx Control in Coalfor NOx Control in CoalFired Utility BoilersFired Utility Boilers

M. Cremer, D. Wang D. BollReaction Engineering International AmerenUE

E. Schindler E. VsquezRJM Corporation RMT, Inc., Alliant Energy Corp.

US DOE Conference on SCR/SNCR for NOx Control

Pittsburgh, PAOctober 29-30, 2003


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Presentation OutlinePresentation Outline

RRI Background

Measured performance Impact of deeper staging

Potential in other unitsEdgewater Unit 4

205 MW cyclone

RRI Operating Costs

Summary


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RRI BackgroundRRI Background

High temperature,fuel-rich conditions

Synergism withstaging and RRI

Avoids ammonia slip

Potential for


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Demonstration ResultsDemonstration Results

B L En g l a n d U n i t 1 ( Co n e c t i v )

130 MW cyclone, 0.55 lb/MBtu

RRI: 30% NOx reduction,


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As Good As it Gets?As Good As it Gets?

0

0.2

0.4

0.6

0.8

1

1.2

1.4

NOx(lb/MBtu

)

Baseline OFA OFA +RRI

Predictions

Measurements

Sioux Unit 1 Results

RRI+OFA: 0.27 lb/MBtu

Predictions consistentwith measurements

Can RRI do better in

Sioux?

Other units?

What NOx emissions can be expected bycombining RRI with deeper staging?

Can better NOx reductions be achievedwith RRI in other units?


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RRI in Sioux Unit 1RRI in Sioux Unit 1

500 MW Cyclone500 MW CycloneNOx (ppm)

SR=0.95, OFA

0.41 lb / MBtu

SR=0.90, OFA

0.28 lb / MBtu

SR=0.90, OFA+RRI

0.18 lb / MBtu


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Edgewater Unit 4Edgewater Unit 4Alliant EnergyAlliant Energy

330 MW, seven barrels,single wall-fired

SmartBurnSM technology

Front and Rear Wall OFA

PRB/Bituminous blend

NOx 0.45 lb/MBtu


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RRI EvaluationRRI Evaluation

Edgewater Unit 4Edgewater Unit 4

0

500

NOx (ppm)

Pre RRI

Post RRI


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Predicted RRI PerformancePredicted RRI PerformanceEdgewater Unit 4Edgewater Unit 4

350

550

750

950

1150

1350

1550

1750

620 640 660 680 700 720

Elevation (ft)

NOxM

assFlow

(lb-N

O2/hr)

Baseline RRI 1 RRI 2 RRI 3 RRI 4

Lower

Barrels

Upper

Barrels

OFA

Impact of injector

location and droplet size

NOx = 52%

52% NOx reduction to 0.22 lb/MBtu,


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205 MW Cyclone205 MW Cyclone

Opposed wall-fired, fourscroll burner barrels

Front and Rear Wall OFA

Bituminous Coal

Large residence time

NOx ~ 0.6 lb/MBtu

1.2 lb/MBtu prior to OFA Barrel EL 406

OFA EL 908

Large residencetime in fuelrich zone


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Predicted PerformancePredicted Performance

205 MW Cyclone205 MW Cyclone

0

700

NOx (ppm)

Pre RRI Post RRI

57% NOx reduction

from 0.61 lb/MBtufull load baseline

Post RRI

0

200

NH3 (ppm)

< 1 ppm NH3


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NSR DependenceNSR Dependence

RRI in 205 MW CycloneRRI in 205 MW Cyclone

30%

35%

40%

45%

50%

55%

60%

0 0.5 1 1.5 2 2.5

Normalized Stoichiometric Ratio (NSR)

NOxReductionPerce

ntage RRI 3 Full Load09

RRI 3 Full Load095

41% reagent utilization at NSR=1

RRI performance increases with staging level

57% NOx reduction to 0.26 lb/MBtu at NSR=2 Best performance with 12 injectors at two elevations


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Overall ResultsOverall Results

0

0.10.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

NOx(lb/

MBtu)

OFA only

OFA+RRI

Sioux 1 Edgwtr 4 205 MW

0.95 0.90 0.90 0.80 0.95 0.90SR

Unit


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Approximate RRI CostsApproximate RRI Costs

0

300

600

900

1200

1500

1800

Sioux 1 Edgwtr 4 205 MW

Unit

$/ton NOx

removedRea g ent Co sts

(Assumes $0.80 per

gallon 50% urea)

Capital Costs consistent with SNCR


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SummarySummary

RRI combined with deeper staging will likely

achieve NOx


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AcknowledgementsAcknowledgements

The authors would like to acknowledgeEPRI and the U.S. Department of

Energy (USDOE) for their support ofthe original development of RRI. USDOE support under contract number

DE-FC26-00NT40753 (Bruce Lani,Project Manager).


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Thank You!Thank You!

40753 REI Netl SCR Workshop 1003 (1)

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