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New Process Qualification
Use of Electrolyte and Corrosion Models
Narasi SridharOctober 2007
Version Slide 206 November 2007
What is Technology Qualification
DNV’s definition of Technology Qualification:
“The process of providing the evidence that the technology will function reliably
within specific limits”
Version Slide 306 November 2007
Why Technology Qualification?
Manufacturer/Designer of New Technology: Assurance of feasibility and fitness for purpose
Integrator of System: Assessment of system reliability
End-user: Selection of technology, ROI evaluation
Regulator: Confirmation of safety assessments
Version Slide 406 November 2007
QUALIFICATION OF NEW TECHNOLOGY
DNV-RP-A203 Qualification Procedures for New Technology- Describes a recommended work process for qualifying
technology- A public document which can be applied by anyone- A revised version in draft form – apply to process qualification
DNV-OSS-401Technology Qualification Management- A description of DNV’s own services directed towards the work
process in DNV-RP-A203- Internal objective: To unify the services within DNV worldwide- External objective: To support agreement of scope-of-work
Version Slide 506 November 2007
What is New Technology?
1: Proven technology 2 - 4: New Technology
Technology Assessment according to DNV RP-A203
Application Area 1Proven
2Limited field history
3New or unproven
1. Known 1 2 3
2. New 2 3 4
Technology status
Application Area 1Proven
2Limited field history
3New or unproven
1. Known 1 2 3
2. New 2 3 4
Technology status
Sulfuric Acid Plant Carbon captureCellulosic ethanol production
Version Slide 606 November 2007
Technology Qualification Management
Milestones
TECHNICAL REPORT
DET NORSKE VERITAS
TechnologyAssessment
Report
Statement ofFeasibility
TA
DNV deliverables
TQP
TECHNICAL REPORT
DET NORSKE VERITAS
TechnologyQualification
Plan
Statement ofEndorsement
TQ?Yes No
NT Fall-backor hold
Certificate ofFitness for Service
TECHNICAL REPORT
DET NORSKE VERITAS
TechnologyQualification
ReportProject Execution
Phase
Define Qualification Basis
Analysis and Testing
Reliability Assessment
Concept Improvement
Selection of Qualification Methods
Qualification Work Process
Technology Assessment
Probability of Success Evaluation (PoS)
Failure Mode Identification and Risk Ranking
Use of simulation
tools
Version Slide 706 November 2007
Application of Models
New processes do not have well established performance history- Reliance on similar process experience- “Generic” equipment experience
Simulations can help- Understand process chemistry, speciation, other stream parameters- Identify materials performance issues through corrosion modeling- Identify data needs
Simulations need to be combined with field experience and laboratory data
Version Slide 806 November 2007
Example of Process qualification – CO2 Capture
Post combustion CO2 capture technologies involve well-known processes –amine absorption approach
New amines, proprietary activators, new design, etc.
Corrosion occurs in pre-absorption units through condensation of water
Version Slide 906 November 2007
Issues
Effect of CO2 and water concentration
Effect of other gases (N2, O2, SOx, NOx etc.)
Effect of chlorides, hydrochlorides
Effect of flow and impingement
Effect of activators
Version Slide 1006 November 2007
Modeling Amine Absorption System
Veevab and Aroonvilas, 2002
Limitations: Does not consider passivity, localized corrosion and does not consider
Concentrated electrolytes and other components
Version Slide 1106 November 2007
Corrosion of CO2 Absorber Column
Corrosion observed opposite gas inlet point
Suspected water condensation along with chlorides and amines
No significant corrosion without water
From T. Ramgopal et al., to be Published in CEST
Version Slide 1206 November 2007
Effect of Water on Corrosion
Corrosion of carbon steel in MDEA
From, T. Ramgopal et al., CEST
Version Slide 1306 November 2007
Effect of Chloride
MEA hydrochloride increases active dissolution in the presence of water
Simulation of the hygroscopic tendency of the amine hydrochloride
Significant effect of hydrochloride compared to MDEA plus chloride (even with CO2)
Data from present work
10-11 10-10 10-9 10-8 10-7 10-6 10-5 10-4 10-3 10-2
Current Density, A/cm2
-1.2
-0.8
-0.4
0
0.4
0.8
1.2
Pot
entia
l, V
vs.
SC
E
50% MEA, RT50% MEA Hydrochloride, RT50%Amine Hydrochloride + AmineAmine + HCl, pH 6.1
Version Slide 1406 November 2007
Effect of Water
10-11 10-10 10-9 10-8 10-7 10-6 10-5 10-4 10-3 10-2
Current Density, A/cm2
-1.2
-0.8
-0.4
0
0.4
0.8
1.2
Pote
ntia
l, V
vs.
SC
E
10%MEA50%MEA90%MEA
-0.3
-0.2
-0.1
0
0.1
0.2
10-10 10-9 10-8 10-7
Water affects active-passive
transitions
Version Slide 1506 November 2007
Summary
DNV new technology qualification procedure is being used for process qualification
Electrolyte simulation tools, such as OLI Analyzers are useful in understanding the chemistry of processes
OLI Corrosion Analyzer may be used to simulate corrosion, thus extending the qualification capabilities
Laboratory electrochemical data needed - Populate the parameter database- Verify simulation results
Version Slide 1606 November 2007