lab-scale development of a hybrid capture system … · task 1: project management • task 2:...
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2017 CAPTURE TECHNOLOGY MEETING
LAB-SCALE DEVELOPMENT OF A HYBRID CAPTURE SYSTEM WITH ADVANCED MEMBRANE, SOLVENT SYSTEM AND PROCESS INTEGRATION
DE-FE0026464
AUGUST 22, 2017
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Membrane Integration
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Membrane/Solvent Integrated Process• Advantages
• Tail-end technology which is easily used in retrofits
• No steam extraction is required• Heat pump is seamlessly
integrated into the cooling and heating of absorption/stripping process
• Operating pressure of the stripper will be very flexible depending on the low quality heat
• Disadvantage• Capital cost could be intensive
Membrane Unit
CO2
Vacuum Pump
StripperClean Flue Gas Air +CO2
Cross Heat Exchanger
Rich Solution
Lean Solution
Lean Solution
Rich Solution
Absorber
Makeup Solvent
Flue Gas
Expansion Valve
Vapor Compressor
Heat Pump Cycle
Air
StripperTo
Combustor
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CCS Team
PSU Team
Dr. Scott Chen and Dr. John Pan
Prof. Harry Allcock and Dr. Zhongjing Li
• Leading Investigator of Phosphazene Polymers (>630 Articles in the Area)
• Renowned Chemist with Experience in Industry, Government and Academia
• Experienced Chemical Engineer
• Strong Background in Separation Processes and Thermodynamics
• Founder of Carbon Capture Scientific, LLC
LIS TeamProf. Hunaid Nulwala and Dr. Dave Luebke
• Experienced Chemist with Experience in Industry, Government, and Academia
• 40+ Publications and 16+ Patents and Applications in Material Development
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Project Outline
• Task 1: Project Management
• Task 2: Computer Simulation of Hybrid Process
• Task 3: Generation 0 ICE Membrane Development
• Task 4: Modification, Installation, and Testing of Absorption Column
• Task 5: Generation 1 ICE Membrane Development
• Task 6: Modification, Installation, and Testing of Air Stripper
• Task 7: Membrane Scale-up and Simulated Flue Gas Testing
• Task 8: Preliminary Techno-economic Analysis
Year 1 Year 2 Year 3
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The System
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retentate stream from membrane
step
clean flue gas
absorber
rich solvent
stripping air
to combustor
stripper
lean solvent
compressor
expander
working fluid
Absorber Strippertop -88.04 19.80
1st inter-stage -52.56 77.422nd inter-stage -43.48 51.353rd inter-stage 33.00
total -184.08 181.51
Heat duties (MW) for the absorption/stripping process (30/600C)
Power Item (in MWe) Baseline Case 12 Hybrid ProcessCompression 44.8 87.48Steam Usage 139.19 0Heat Pump Cycle 0 23.79Membrane Unit 0 15.7Others 20.6 20.6total 204.6 147.57
Energy Performance of the Hybrid Process
Hybrid Process Simulation
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Absorber Testing
Lean loading: 6.4 wt% Lean loading: 5.8 wt%
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Stripper Testing
3
4
5
6
7
40 60 80 100 120
Lea
n lo
adin
g, w
t%
G/L ratio, L/L
60C
65C
Target lean concentration
Target G/L ratio for absorption at 35C.
3
4
5
6
7
40 60 80 100 120
Lea
n lo
adin
g, w
t%
G/L ratio, L/L
55C
60C
Target lean concentration
Target G/L ratio for absorption at 25C.
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The Membrane
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Plan of Attack for Mixed Matrix MembranesCO2 N2
• Use simple nanoparticle fillers
• Surface modify the particles to improve interactions with CO2 and the polymer
• Employ an advanced polymer with good compatibility and CO2transport properties
• Create a membrane in which diffusion phenomena are determined by interactions with the particle and polymer surface
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Membrane Fabrication and Optimization
Nano-particleSelection Nano-particle
Modification
Membrane FilmFabrication
5-10 nm Silica
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The Polymer
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Processability/Mechanical Properties
Chemical and Environmental
Stability
Gas Separation Performance
?The Ideal Polymer?
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P N P N
R1
R2 R3
R4
What’s so great about polyphosphazenes?
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Ultra Flexible chainsHigh chain mobility
Improved gas solubility and diffusion
P N P N
R1
R2 R3
R4
What’s so great about polyphosphazenes?
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P N P N
R1
R2 R3
R4
What’s so great about polyphosphazenes?
Macromolecular substitution
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P N P N
R1
R2 R3
R4
What’s so great about polyphosphazenes?
Excellent chemical and thermal stabilityC-C =607ΔHf kJ/mol vs. P-N =617 ΔHf kJ/mol
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Selected Polymer
OO
O
PN
O
x
z
y=3%
Polymer Crosslinking Approach
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Fabrication and Testing
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Knife Casting on Porous Support
Polymer Dope
Knife
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Generation 0 Membrane (Neat Polymer)
R² = 0.9792
400
420
440
460
480
500
520
540
560
35 40 45 50 55 60
CO2
Perm
eabi
lity
(Bar
rer)
Selectivity CO2/N2
50°C
45°C
40°C
35°C
30°C
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Generation 1 Membrane (Mixed Matrix) %wt. Loading of Nanoparticles Characterization Membrane Results
Permeability Selectivity30% Unmodified
Particles
Non-Homogenous
Films
N/A N/A
10% Modified
Particles
SEM, TGA, DSC,
Membrane Testing
659 41
20% Modified
Particles
Membrane Testing 675-1025 20-33
40% Modified
Particles
SEM, TGA, DSC,
Membrane testing
1609 44
60% Modified
Particles
Membrane testing 250-400 25-30
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• Further optimization of membrane composition Design of Experiments• Surface modification of the
nanoparticles• Concentration of nanoparticles• Degree of crosslinking
• 30 compositions examined.
Design of Experiments Matrix
Using statistical tools to optimize membrane composition
24
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Next Steps
• Complete optimization of membranes.• Test membranes in simulated flue gas.• Fabricate membranes as sub-micron films.• Complete preliminary economic analysis.
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Acknowledgement
Liquid Ion Solutions, Carbon Capture Scientific and Penn State University gratefully acknowledge the support of the United States Department of Energy’s National Energy Technology Laboratory under agreementDE-FE0026464, which is responsible for funding the work presented.
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Questions?