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SCR Catalyst Selection Considerations - McIlvaine Company · 2010-10-22 · SCR Catalyst Selection...
Transcript of SCR Catalyst Selection Considerations - McIlvaine Company · 2010-10-22 · SCR Catalyst Selection...
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SCR Catalyst Selection
Considerations
McIlvaine Hot Topic Hour
October 21st, 2010
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Cormetech Approach
• Understand the unique perspectives and
challenges for individual utilities and/or plants
– Not all utilities/plants have the same drivers
• Utilize strong experience and knowledge base in
combination with strategic collaborations to
provide full range of solution options
– Catalyst Technology Advancements
– Optimization Tools
– Strategic Collaboration
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Integrated Management Considerations
• Schedule
• Duration
• Layer actions
• Maintenance
•Fuels & Additives• AIG design/tuning• APH/PM/Scrubber• Power Generation Mix• Operating Load Profile
• NOx
• Hg
• SO2 conv.
• Life/NH3 Slip
• New vs. Regen
• Guarantees
• HC
• Plate
• Corrugated
Catalyst Type
Performance
Outage Planning
System/BOP
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Catalyst Management
Current Active Projects:
1. Continuous Improvement
• Activity & SO2 conversion Improved $ per K/AV
2. Advanced Hg Oxidation catalyst
3. Selective Decomposition of Ammonia
4. Proven Evaluation Tools
5. Strategic Collaboration
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Advanced Hg Oxidation catalyst
• Drivers
– CAMR vacated but still anticipate Federal and State rules to require 90% reduction (basis coal pile to stack)
– Will it be 90%? Will it be a rate? How does the requirement effect technology selection/applicability (fuel)/cost?
• Timing
– Expected Rule 2011 compliance 2014?
• Market Needs
– What is anticipated oxidation need from SCR?
– What is anticipated contribution from APH, ESP, FGD, etc.?①Elemental
③Particle-bound
②Oxidized
(Hg0)
(Hg2+)
(Hg(p))
Stack
Air
Heater
ParticulateControlDevice
FGD
DeNOx・Hg Oxidation
Boiler
Coal Pile
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SCRCatalyst
Undesired Reactions:
HgCl2 + NH3 + ¼ O2 Hg + 2 HCl + ½ N2 + ½ H2O (HgCl2 Reduction by NH3)
HgCl2 + SO2 + H2O Hg + 2 HCl + SO3 (HgCl2 Reduction by SO2)
SO2 + ½ O2 SO3 (SO2 Oxidation)
NOx+NH3
Simultaneous SCR Reactions:DeNOx - Hg Oxidation and Reduction – SO2 oxidation
NH3 for DeNOx
NOx N2+H2O
Hg + HCl Hg + HCl HgCl2
Desired Reactions:NO + NH3 + 1/4 O2 N2 + 3/2 H2O (NOx Reduction)
Hg + 2 HCl + ½ O2 HgCl2 + H2O (Hg Oxidation)
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Co-Benefit Improvement Strategy
Increase Rate of Desired Reactions:
NO + NH3 + 1/4 O2 N2 + 3/2 H2O (NOx Reduction)
Hg + 2 HCl + ½ O2 HgCl2 + H2O (Hg Oxidation)
Decrease Rate of Undesired Reactions:
HgCl2 + NH3 + ¼ O2 Hg + 2 HCl + ½ N2 + ½ H2O (HgCl2 Reduction by NH3)
HgCl2 + SO2 + H2O Hg + 2 HCl + SO3 (HgCl2 Reduction by SO2)
SO2 + ½ O2 SO3 (SO2 Oxidation)
- Advanced SCR Catalyst!
- Advanced SCR Catalyst!
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Advanced Hg OxidationMHI/Cormetech Joint Development
Low HCl Example
Expected Mercury Oxidation
(5 ppm HCl in Flue Gas, 371 oC)
0
20
40
60
80
100
1 2 3 4Increasing Potential -->
% O
xid
ize
d H
g
Advanced - fresh Advanced - Aged Current - Fresh Current - Aged
High Temperature Example
Expected Mercury Oxidation
(65 ppm HCl in Flue Gas, 403 oC)
0
20
40
60
80
100
1 2 3 4Increasing Potential -->
% O
xid
ized
Hg
Advanced - fresh Advanced Aged Current - Fresh Advanced Aged
• Additional Features– Much lower negative impact from
reducing species
– Designed for high durability over time
– Can be used alone or in combination with
existing catalyst
– Reduced total compliance cost
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Selective Decomposition of Ammonia
• Drivers:
– NH3/NOx maldistribution requires
periodic tuning and limits NOx reduction
achievable
• NH3 in excess in some areas due to
maldistribution can lead to downstream
equipment fouling
– Continued pressures on total NOx
emissions
• What is value of:
– Reduced tuning costs
– DP savings
– Reduced fouling
– High NOx Reduction (95%+)
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SDA Catalyst
• US Patent 7658898 (joint Cormetech–MHI patent)
• Reaction network for SDA catalyst:
DeNOx:
NO + NH3 + 1/4O2 N2 + 3/2H2O
SO2 oxidation:
SO2 + 1/2O2 SO3
NH3 oxidation:
4NH3 + 3O2 2N2 + 6H2O
4NH3 + 5O2 4NO + 6H2O
4NH3 + 7O2 4NO2 + 6H2O
2NH3 + 2O2 N2O + 3H2O
SO3 reduction:
SO3 + 2NH3 + O2 SO2 + N2 + 3H2O
Dominant NH3
oxidation reactions
Not active
Low activity (1-2 ppm)
Reaction equations for
standard SCR catalyst
SDA catalyst incorporates
NH3 oxidation functionality
(without increasing
SO2 oxidation)
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• Developed kinetic model for SDA catalyst
– Predict DeNOx, NH3 oxidation, and SO2 oxidation activity
– Utilized 15 sets of fresh performance data
• Proposed system layer arrangement:
• Ran simulations:
– Catalyst surface area vs. RMS at 90%, 95%, and 99% DeNOx
– Two case studies (compare SDA system vs. standard catalyst):
90% DeNOx and 99% DeNOx
Simulations: Case Studies
Layer 1flue gas
flowLayer 2
SDA Catalyst Standard SCR Catalyst
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0.5
1.0
1.5
2.0
2.5
3.0
0% 2% 4% 6% 8% 10% 12% 14% 16%
NH3/NOx RMS
Rela
tive C
ata
lyst
Su
rface A
rea
Constant average NH3 slip = 2 ppm
Surface area reference basis is standard catalyst at 90% DeNOx and 5% RMS
Standard Catalyst
at 99% DeNOx
Standard Catalyst
at 95% DeNOxStandard Catalyst
at 90% DeNOx
SDA Catalyst
at 90% DeNOx
SDA Catalyst
at 95% DeNOx
SDA Catalyst
at 99% DeNOx
Impact of NH3/NOx RMS on Catalyst SurfaceArea (or Catalyst Volume for Constant Pitch)
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Evaluation Tools
• Multiple Tools/Capabilities
Including:
– Fuels management tool
– Additives Analysis
– Laboratory Analysis
– AIG Design/Tuning
– Lifecycle management
economic evaluation tool
– Expanded operating
temperature range
Calc
ium
Oxid
e i
n C
oa
l, w
t%C
alc
ium
Oxid
e i
n C
oa
l, w
t%
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• Cormetech and CoaLogix are pleased to
announce the collaboration of the two of the
leading Supply and Technology Companies for
SCR Services
Strategic Collaboration
&
Announced: August 10, 2010
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Cormetech & CoaLogixCore Competencies & Capabilities
• Cormetech
– SCR Catalyst Manufacturing
– SCR System Application/Management Experience
– Technology Advancements in Hg oxidation, SDA, SO3 mit., etc.
• CoaLogix
– Regeneration Technology/Experience
– SCR Management Experience
– SO3 and Hg mitigation (FLSmidth Agreement)
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Cormetech & CoaLogix
• Key Benefits of Cormetech Certification
– Combination brings 360° Catalyst Mgmt Service
– Integrated performance solutions and warranties
– Simplified and consolidated purchasing and inventory
management & supply assurances
– Long-term SCR catalyst management commitment
– Integrated technology to assure lowest compliance cost