advanced computational tools for optimization and ... · • based on impeller speed limitations...
TRANSCRIPT
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David C. Miller, Ph.D. U.S. Department of Energy National Energy Technology Laboratory Pittsburgh, PA
5 September 2014
Advanced Computational Tools for Optimization and Quantification of Uncertainty
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Acknowledgements – Carnegie Mellon University
• Nick Sahinidis, Alison Cozad, Zhihong Yuan • John Eslick • Ignacio Grossmann, Yang Chen
– LLNL • Brenda Ng, Charles Tong, Jeremy Ou, Jim Leek, Tom Epperly
– LBNL • Josh Boverhof, Deb Agarwal, You-Wei Cheah
– NETL • Andrew Lee, Juan Morinelly, Hosoo Kim
– West Virginia University • Debangsu Bhattacharyya, Srinivasarao Modekurti, Ben Omell • David Mebane
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• DOE/FE Mission & Carbon Capture Challenge
• Carbon Capture Simulation Initiative
• Optimization & Quantification of Uncertainty
• Summary
Outline
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• RD&D of cutting edge fossil energy technologies to ensure a secure, affordable, low-carbon energy future. – Collaborative partnerships with industry – International collaboration
• The Cross-cutting Research activity serves as a bridge between basic and applied research by fostering the development and deployment of innovative systems for improving efficiency and environmental performance. – Includes development of computation, simulation, and modeling
tools focused on optimizing plant design and shortening developmental timelines.
Mission
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~70 mol% N2~13 mol% CO2
• Fossil energy generates: – 67% of the US electricity
• 42% coal, 25% natural gas – 65% worldwide electricity
• Large-scale problem – 2 billion tons/year CO2 emitted from coal by 2020 in US – Flue gas: 5 million lb/hr for 550MW PC plant (630 kg/s)
• No existing economical solution – Cost of capture plant – De-rate of power plant
• Need for system optimization to fully evaluate technology options
Challenges associated with carbon capture
U.S. Energy Information Administration, Annual Energy Outlook 2013 Early Release Overview. Report Number: DOE/EIA-0383ER(2013), http://www.eia.gov/forecasts/aeo/er/pdf/0383er%282013%29.pdf (2013). U.S. Energy Information Administration, International Energy Outlook 2011. Report Number: DOE/EIA-0484(2011), http://www.eia.gov/forecasts/ieo/pdf/0484%282011%29.pdf (2011).
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Clean Coal Research Program Goals Driving Down the COE and Cost of Coal Power CCS
Goals shown are for greenfield plants. Costs are for nth-of-a-kind plants, during first year of plant operation, and include compression to 2215 psia but exclude CO2 transport and storage costs. Today's capture costs are relative to Today's SCPC without CO2 capture. 2020 and 2030 capture costs are relative to an A-USC PC without CO2 capture.
0% Reduction
20% Reduction
>20% Reduction
40
50
60
70
80
90
100
110
IGCC or Supercritical PC
2nd-Generation Technology
Transformational Technology
COE
Relat
ive to
Toda
y's IG
CC w
ith C
aptu
re, %
Today 2020 2030
Cost of Electricity Reduction Targets Corresponding Cost of CO2 Capture Targets
~60
~40
<40
0
10
20
30
40
50
60
70
IGCC or Supercritical PC
2nd-Generation Technology
Transformational Technology
Cost
of C
aptu
re, 2
011$
/tonn
e CO 2
Today 2020 2030
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Development Challenges • The traditional pathway from discovery to
commercialization of energy technologies can be quite long, i.e., ~ 2-3 decades1
• President’s plan requires that barriers to the widespread, safe, and cost-effective deployment of CCS be overcome within 10 years2
• To help realize the President’s objectives, new approaches are needed for taking CCS concepts from lab to power plant, quickly, and at low cost and risk
• Accelerate the development of CCS technology, from discovery through deployment, with the help of advanced computations tools and models
Bench Research ~ 1 kWe
Small pilot < 1 MWe
Medium pilot 1 – 5 MWe
Semi-works pilot 20-35 MWe
First commercial plant, 100 MWe
Deployment, >500 MWe, >300 plants 1. International Energy Agency Report: Experience Curves for Energy Technology
Policy,” 2000. 2. http://www.whitehouse.gov/the-press-office/presidentialmemorandum-a-comprehensive-federal-strategy-carbon-capture-and-storage
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• DOE/FE Mission & Carbon Capture Challenge
• Carbon Capture Simulation Initiative
• Optimization & Quantification of Uncertainty
• Summary
Outline
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For Accelerating Technology Development
National Labs Academia Industry
Rapidly synthesize optimized processes to identify promising
concepts
Better understand internal behavior to
reduce time for troubleshooting
Quantify sources and effects of uncertainty to
guide testing & reach larger scales faster
Stabilize the cost during commercial
deployment
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• Develop new computational tools and models to enable industry to more rapidly develop and deploy new advanced energy technologies – Base development on industry needs/constraints
• Demonstrate the capabilities of the CCSI Toolset on non-proprietary case studies – Examples of how new capabilities improve ability to
develop capture technology
• Deploy the CCSI Toolset to industry – Support initial industry users – Obtain feedback on features and capabilities – Arrange for long term commercial licensing
Goals & Objectives of CCSI
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• Organizational Meetings: March 2010 - October 2010 • Technical work initiated: Feb. 1, 2011 • Preliminary Release of CCSI Toolset: September 2012
– Initial licenses signed • CCSI Year 3 starts Feb. 1, 2013
– Began solvent modeling/demonstration component • 2013 Toolset Release: October 31, 2013
– Multiple tools and models released and being used by industry
• Future – 2014 Toolset Release: October 31, 2014 – planned – Final release and workshop late 2015 – Commercial licensing late 2015 or early 2016
CCSI Timeline
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Risk Analysis & Decision Making
Process Design & Optimization
Tools
Cross-Cutting Integration Tools Data Management, Execution Gateway, GUI, Build & Test Environment, Release Management
Process Models
Validated High-Fidelity CFD
High Resolution
Filtered Sub-models
Advanced Computational Tools to Accelerate Carbon Capture Technology Development
Basic Data Sub-models
Advanced Process Control
& Dynamics
Uncertainty Quantification
Uncertainty Quantification
Uncertainty Quantification
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Carbon Capture (and other process) Simulation Grand Challenges
• Multiple Scales – Particle: individual adsorbent behavior, kinetics and transport – Device: fluid and heat flows within a sorbent bed – Process: integration of devices for a design of a complete
sorbent system • Integration across scales
– Effective simplifications: Detailed tools too complex to integrate/optimize
• Verification/Validation/Uncertainty – Create confidence in predictions of models
• Decision support – Evaluate key process performance issues affecting choices of
technology deployment/investment
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• DOE/FE Mission & Carbon Capture Challenge
• Carbon Capture Simulation Initiative
• Optimization & Quantification of Uncertainty
• Summary
Outline
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Process Models
Solid In
Solid Out
Gas In
Gas Out
Utility In
Utility Out
Tools to develop an optimized process using rigorous models
Basic Data Submodels
Process Dynamics
and Control
Optimized Process
GHX-‐001CPR-‐001
ADS-‐001
RGN-‐001
SHX-‐001
SHX-‐002
CPR-‐002
CPP-‐002ELE-‐002
ELE-‐001
Flue GasClean Gas
Rich Sorbent
LP/IP SteamHX Fluid
Legend
Rich CO2 Gas
Lean Sorbent
Parallel ADS Units
GHX-‐002
Injected Steam
Cooling Water
CPT-‐001
1
2
4
7
8
5 3
6
9
10
11
S1
S2
S3
S4
S5
S6
12
13
14
15
16
17
18
19
21
24
2022
23
CYC-‐001
Algebraic Surrogate Models
Uncertainty
Uncertainty
Uncertainty
Uncertainty
CFD Device Models
Uncertainty Quantification Simulation-Based
Optimization
Uncertainty
Superstructure Optimization
Surrogate models for each reactor and technology used
Uncertainty
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Process Models Bubbling Fluidized Bed (BFB) Model • 1-D, nonisothermal with heat exchange • Unified steady-state and dynamic • Adsorber and Regenerator • Variable solids inlet and outlet location • Modular for multiple bed configurations
Moving Bed (MB) Model • 1-D, nonisothermal with heat exchange • Unified steady-state and dynamic • Adsorber and Regenerator • Heat recovery system
Compression System Model • Integral-gear and inline compressors • Determines stage required stages, intercoolers • Based on impeller speed limitations • Estimates stage efficiency • CO2 drying (TEG absorption system) • Off-design performance. • Includes surge control algorithm
0 0.2 0.4 0.6 0.8 10.04
0.06
0.08
0.1
0.12
0.14
z/L
yb (k
mol
/km
ol)
CO2H2O
0 0.5 1200
400
600
800
1000
kmol
/hr
z/L
Solid Component Flow Profile of MB Regenerator
Bicarb. Carb. H2O
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Superstructure optimization
Simplifying the balance between op3mal decision-‐making and model fidelity through tailored simple surrogate models
High-fidelity simulations and experiments
Algebraic surrogate models
Technology selection
A. Cozad, N. V. Sahinidis and D. C. Miller, 2014, "Learning surrogate models for simulation-based optimization." AIChE Journal 60(6): 2211-2227.
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• Step 1: Define a large set of potential basis functions
• Step 2: Model reduction
ALAMO: Model Development & Overfitting
True error Empirical error
Complexity
Err
or
Ideal Model
Overfitting Underfitting
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ALAMO: Surrogate Model Development
Complexity or terms allowed in the model
Goodness-of-fit measure 6th term was not worth the added
complexity
Final model includes 5 terms Some measure of
error that is sensitive to overfitting
(Bayes Information Criterion)
Solve for the best one-term model
Solve for the best two-term model
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• We use an iterative design of experiments to – Sample better or sample fewer data points
• Two models given the same data set size:
Adaptive Sampling Improves Surrogate Model
Even sampling Stronger sampling
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Multiple responses
Response bounds
Alternative domains
Multiple responses
mass balances, sum-to-one, state variables
Constrained Regression Improves Surrogates Response bounds
pressure, temperature, compositions
Alternative domains
safe extrapolation, boundary conditions safe extrapolation, boundary conditions
Problem Space
Extrapolation zone
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Carbon Capture Reactors Regenerator Adsorber
Overflow configura5on
Underflow configura5on Underflow configura5on
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• Discrete decisions: How many units? Parallel trains? What technology used for each reactor?
• Continuous decisions: Unit geometries • Operating conditions: Vessel temperature and pressure, flow rates,
compositions
Carbon Capture System Configuration
Surrogate models for each reactor and technology used
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Input — Initial guess, problem definition
Output — Best variable and objective values
FOQUS Engine: DFO and/or UQ
Meta-flowsheet Evaluation — executed in parallel, may include rigorous heat integration
Sam
ples
Res
ults
Turbine: Simulation queuing/execution,
error and result management
SimSinter: standard interface for simulation software, graphical tool
Simulation: Aspen Plus, Aspen Custom Modeler, gPROMS,
Microsoft Excel
Heat Integration Tool: Solves LP transshipment model in GAMS, takes stream and equipment information from
flowsheet, and returns heat integration results
Framework for Optimization, Quantification of Uncertainty and Sensitivity
D. C. Miller, B. Ng, J. C. Eslick, C. Tong and Y. Chen, 2014, Advanced Computational Tools for Optimization and Uncertainty Quantification of Carbon Capture Processes. In Proceedings of the 8th Foundations of Computer Aided Process Design Conference – FOCAPD 2014. M. R. Eden, J. D. Siirola and G. P. Towler Elsevier.
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• Links simulations to FOQUS/Turbine
• Support for – gPROMS – Aspen Plus – Aspen Custom Modeler – Excel
• Costing • Generic connectivity (i.e., Thermoflex)
• Explicitly links to any input/output variables via GUI – JSON structure
Sinter: Generic Connectivity for Simulations
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Turbine: Simulation Execution Management • Works with Aspen, gPROMS, Excel • Supports large number of simulation executions
– Manages failed simulations • Scalable
– Amazon Cloud • Up to 500 parallel simulations tested • Over 100,000 simulations run
– Cluster at NETL (coming online 2014) – Local desktop
• Challenge: Licensing of commercial simulation tools
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FOQUS: DFO Example with Heat Integration Objective Function: Maximize Net efficiency Constraint: CO2 removal ratio ≥ 90% Flowsheet evaluation (via process simulators) Minimum utility target (via heat integration tool) Decision Variables (17): Bed length, diameter, sorbent and steam feed rate
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FOQUS Optimization Results
Simultaneous Sequential w/o heat integration
Net power efficiency (%) 32.6 31.8 30.0 Net power output (MWe) 504.3 491.5 463.9 CO2 removal ratio (%) 91.9 90.2 90.2 Electricity consumption (MWe) 86.9 75.1 75.1 IP steam (kg/s) 0 0 0 LP steam (kg/s) 93.9 125.3 139.0 Cooling water consumption (m3/s) 12.8 10.4 20.7 Heat addition to feed water (MWth) 135.4 139.8 0
Base case w/o CCS: 650 MWe, 42.1 %
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Uncertainty in Kinetic Parameters
Ki = exp
ΔSi
R⎛⎝⎜
⎞⎠⎟
exp−ΔHi
RT⎛⎝⎜
⎞⎠⎟
P
H2O(g) ! H2O(phys)
R2NH + CO2,(g) + H2O(phys) ! R2NH2
+ + HCO3−
2R2NH + CO2,(g) ! R2NH2
+ + R2NCO2−
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UQ Sampling
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Feasible Input Distributions for Equilibrium Model Uncertainty
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Probability distribution for the loading exiting the regeneration system
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Required new steam flow to meet product specs
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Data Management: Provenance
UQ Analysis
Optimization Runs
Superstructure Results Determine Structure
Algebraic Surrogate Models
Process Model
Kinetic Model
Experimental Data
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• DOE/FE Mission & Carbon Capture Challenge
• Carbon Capture Simulation Initiative
• Optimization & Quantification of Uncertainty
• Summary
Outline
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CCSI Release 2013.10.2
Basic Data Submodels High viscosity solvent model SorbentFit – Kinetic/diffusion basic data fitting tool with UQ
High Resolution Filtered Submodels
Attrition Model Cylinder Filtered Models with quantified uncertainty bounds
Validated high-fidelity CFD models
& UQ tools
1 MW Adsorber and Regenerator CFD Models (validated) Large scale adsorber and regenerator CFD Models Statistical Model Validation Tool for Quantifying Predictions REVEAL: Reduced Order Modeling Tools for CFD and ROM Integration Tools
Process Models
Bubbling Fluidized Bed Reactor Model Moving Bed Reactor Model Multi-stage Centrifugal Compressor Model Membrane CO2 Separation Model Reference Power Plant Model
Optimization and UQ Tools
FOQUS – Optimization & Quantification of Uncertainty ALAMO – Surrogate models for optimization Process Synthesis Superstructure Oxy-Combustion Process Optimization Model
Dynamics & Control D-RM Builder
Risk Analysis Tools Technical Risk Model Financial Risk Model
Crosscutting Integration Tools
SimSinter – Links simulation files to FOQUS/Turbine Turbine Science Gateway – Runs hundreds of thousands of simulations
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• Initial licensees:
• Additional licensees:
• Others licenses in progress….
• CRADA: in development
Toolset Deployment
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Annual Review of Chemical and Biomolecular Engineering 5: 301-323.
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56 National Lab researchers 35 Students/post-docs 8 Professors 5 National Labs 5 Universities 20 Companies on IAB
Disclaimer This presenta,on was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any informa,on, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily cons,tute or imply its endorsement, recommenda,on, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.