Re-use of CO2 and intermittent renewables · SEWGS the process High temperature (400oC), high...
Transcript of Re-use of CO2 and intermittent renewables · SEWGS the process High temperature (400oC), high...
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Re-use of CO2 and
intermittent renewables
W.G. Haije (ECN)
S. Walspurger (ECN)
H. Geerlings (TUD)
June 2013
ECN-L--13-050
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www.ecn.nl
Re-use of CO2 and intermittent
renewables Wim Haije ECN/TUD
Stephane Walspurger ECN
Hans Geerlings TUD
CCCC 2013 05-06-2013
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Current situation
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Intermittent renewables
Energy storage problem
Poly generation: Electricity +
Fuel or Chemicals
CO2 capture
(from large point
sources)
Fossil Fuels (base load)
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Variability sustainable sources
• At present, countries like Germany and Spain have > 30 % power from intermittent sources, and are no longer able to “store” it in the grid when demand is low.
• IGCC installations cannot run in partial load
• In general this kind of large scale utilities, if they can be run at lower load, need quite some time for ramping up and down.
• Storage in the form of electricity on this scale is very difficult
• Storage in the form of hydrogen on this scale is not feasible.
• The gas grid (if present) has some capacity but H2 concentrations are typically 10 % max
• “Wish storage material”: something like gasoline!
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High gravimetric & volumetric
density
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Variability/Intermittency
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Storage-only efficiency
electrolysis Methanation
CO
2
E H2 SNG 1000 MWe 710
MWth
570 MWth
1 Mton CO2
55-60% storage Rather than No storage
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Why CO2 re-use/solar fuels
• CO2 is an enabler for hydrogen transport and storage (energy carrier)
• CO2 is available to answer the intermittent H2 production from renewables (CO2 is available continuously from a variety of sources)
• Chemicals/Fuels from CO2 are a means to sustain a fossil fuel based economy (infrastructure, plants etc..) during the transition towards a completely renewable energy based economy (using carbon at least twice)
• CO2 emissions are reduced by saving primary resources and optionally, depending on regional configuration, CO2 storage/mineralisation
– In chemical products (minor)
– In energy systems (significant)
CO2 re-use potential is about two orders of magnitude less than produced by the power production
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G- GRID
P- GRID
Electricity from Renewable
Coal & Gas
CO2 Capture
CO2 Transport &
Storage
Gas Storage
Electrolysis->H2
BULK CHEMICALS
FUELS
Oil & Gas
CO2 reuse technologies
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Chemistry and technology
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Chemical products
• Main chemicals with a ”green colour” are polymers (40-50w% CO2) – Polycarbonates and poly(ester-co-carbonate)s (DSM)
– Polypropylene carbonate (PPC) and CO2 polyols (BASF, Novomer)
– Polyethylene carbonate (PEC) (Bayer)
• Bio Based – Food for bacteria and microalgea (final product Diesel)
• Artificial leaves – Formic acid (Panasonic)
• Inorganics – Solvay process (alkali carbonates)
– Cement/concrete
Although the polymer market is huge, these activities will not have significant impact on the CO2 levels in the atmosphere.
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Coupling of H2 to CO2
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Intermittency versus base load
of power production
H2 storage
CO2 sequestration
Gas quality
• Gas from high CO2 content gas fields Up to 60% CO2
• Digester gas is produced at small scale by manure digestion at farms. Digester gas consists of 50 to 75%
methane and 25 to 50% CO2 • Producer gas from biomass gasification
Biomass has higher carbon content than methane, which means that either CO2 has to be removed from the gas or hydrogen has to be added.
But also • Pure CO2 from capture plants, industrial
point sources etc..
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How nature does it
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Theoretical 40%, Practical 15%, from light to H2
0.2-1.0%
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What we do with it
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Methane
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Can we do the same trick?
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Yes we can!.............
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Reaction ΔH
kJ/mol
CO2 + 4H2 ↔ CH4 + 2H2O -167.0 methanation
CO + 3H2 ↔ CH4 + H2O -206.0 methanation
CO2 + H2 ↔ CO + H2O +41.3 reverse water gas shift reaction
nCO + 2nH2 → −(CH2)n− + nH2O -126.0 Fischer-Tropsch
CO2 +3H2 ↔ H2O + CH3OH -49.6 methanol synthesis
CO + 2H2 ↔ CH3OH -90.8 methanol synthesis
………. because CO2 is always in equilibrium with other components and just needs a little help to go beyond that equilibrium!
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Fundamentals
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1
10
100
1000
10000
100 300 500 700
Water gas shift
CO + H2O ↔ CO2 + H2 0 = -41 KJ/mol
Conversion limited by equilibrium:
Keq =( PH2 PCO2 )/( PCO PH2O)
T(0C)
Keq
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How to produce pure H2 and CO2?
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CO + H2O H2
CO2
CO2 CO2
CO2
CO2
CO2
sorbent sorbent catalyst
CO2
Le Chatelier’s Principle 1 cm
CO32-
H2O
Mg(OH)6 -octahedron
Al(OH)6 -octahedron
Promoted with K2CO3
Mg6Al2(OH)16CO3.4H2O
Hydrotalcite (layered clay)
Fe-Cr
Sorption enhanced water gas shift (SEWGS)
CO + H2O ↔ CO2 + H2
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SEWGS the process
High temperature (400oC), high pressure (35 bar) production of H2 from Syngas.
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CO2 H2
H2O
H2O
CO
H2
CO2
H2O H2O
CO2
Water-Gas Shift: CO + H2O CO2 + H2
Carbonate Formation
Decarbonisation
Animation: Paul Cobden, ECN
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SEWGS and what you can learn
from it……….
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100% CO2
100% H2
+
Thermodynamics @ 400oC: 34% conversion
Two patent applications • Sorbent • Process for CO2/H2S separation
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Consequently:
• The reverse of the previous, the reverse sorption enhanced WGS, should work as well:
• Idea: take out the water, yielding full conversion to CO, and with more H2 any syngas composition can be tuned!!
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CO2 + H2↔ CO + H2O
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Wonderful…..
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CO2 + H2 ↔ H2O + CO
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100% conversion!!
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Experimental
Thermodynamics
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Artist impression
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Haije & Geerlings dx.doi.org/10.1021/es203160k |Environ. Sci. Technol.
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Efficiency estimate
• PV State of the Art :19%.
• High pressure electrolysis State of the Art: 85%
►Solar hydrogen: 16%.
• Including a mismatch between photo-voltage and electrolysis potential : this number reduces to 13%.
• SERWGS: 90% (The only new technology in the process!)
• Fischer-Tropsch : 70%
►Overall efficiency: Solar to fuels : 8.2%
• Including Carbon Capture penalty of 150 kJ/mol of CO2: 7.7%
• Alternative routes generally 1-2 orders of magnitude lower!!
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Economic viability
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Simple cost estimation
• Equation
• Capital Cost: – Investment Cost Electrolyzer 700US$/kW; CRF 20%; ISBL=2OSBL
• H2 production: – Conversion power to H2 : 62% efficiency, at 100-30% load.
• Power Cost: – 0 to 5 ctUS/kWh
H2 cost (Eur/kg) = Power Cost
H2 produced
Capital Cost +
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Hydrogen costs from water electrolysis
• At high availability, H2 cost mostly sensitive to power costs.
• At availability < 4000h cost increase due to capital intensive electrolyzer (low depreciation)
• Solar capacity factor around 10-15%
• Wind capacity factor 20-30%
• Still way above H2 from fossil fuels (1.8US$/kg, IEA forecast for 2050)
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Real case (Wind generation)
• Raw data sorted to determine electrolyzer’s size
• Hourly Fluctuation neglected in first approach
• Source data : http://www.ieso.ca/imoweb/marketdata/windpower.asp (Ontario, Canada)
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Real case (Hydrogen from Wind)
• Assumptions: – Electrolyzer capacity = 75% installed wind
capacity
– Electrolyzer operational window at 62% efficiency: 100%-30% load.
– Surplus sold as power to the grid
– Downtime power sold to the grid
• Hydrogen Availability: 4440 hours/y
• Average power used: 831 MW
– Equal to 64% of the electrolyzer capacity
• New equation:
H2 cost (Eur/kg) = Power Cost
H2 produced * 0.64
Capital Cost + - Power production Revenues
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Real case (Hydrogen cost)
• Electrolyzer operation extended • From 1700-2700h/y-1 to 4000-5000h
• Electrolyzer average operation at 64% part-load (100-30%)
• How about true efficiency?
• Number of start-up/shut down high • 96 interruptions / year (Power production
below electrolyzer 30% capacity)
• Improvements: • Mixed renewable sources
(wind+solar+hydro)?
• Flexible modular electrolyzers
• Higher Efficiency vs. load
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Real case (SNG cost)
• Assumptions: – Electrolyzer capacity = 75% installed wind capacity
– Electrolyzer operational window at 62% efficiency: 100%-30% load.
– Surplus sold as power to the grid
– Downtime power sold to the grid
– Power to SNG Availability: 4440 hours/y
– Average power used: 831 MW (64% electrolyzer capacity)
• SNG plant:
• 95% efficiency
• Investment costs: 40US$/kWe electrolyzer installed
• SNG cost: from 45-80 US$/GJ, 10 times NG prices
• Complementary questions: – SNG train response to part-load and shut down
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Real case (MeOH cost)
• Assumptions: – Electrolyzer capacity = 75% installed wind capacity
– Electrolyzer operational window at 62% efficiency: 100%-30% load.
– Surplus sold as power to the grid
– Downtime power sold to the grid
– Power to SNG Availability: 4440 hours/y
– Average power used: 831 MW (64% electrolyzer capacity)
• MeOH plant:
• 95% efficiency
• Investment costs: 60US$/kWe electrolyzer installed
• MeOH cost: from 800-1500 US$/t, 2-3 times MeOH prices from NG
• Complementary questions:
– MeOH conversion train response to part-load and shut down
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Real case (GtL cost)
• Assumptions: – Electrolyzer capacity = 75% installed wind capacity
– Electrolyzer operational window at 62% efficiency: 100%-30% load.
– Surplus sold as power to the grid
– Downtime power sold to the grid
– Power to SNG Availability: 4440 hours/y
– Average power used: 831 MW (64% electrolyzer capacity)
• GtL plant:
• 95% efficiency
• Investment costs: 60US$/kWe electrolyzer installed (150000US$/tpd installed, 40% of mini GtL plant capital costs)
• GtL cost : from 300-550 US$/barrel, 3-5 times oil prices
• Complementary questions:
– GtL conversion train response to part-load and shut down
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Wrap-up
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Take home messages
• Hydrogen will not prevail as sole energy carrier besides electricity
• CO2 can be pushed into reaction with a.o. hydrogen (separation enhancement)
• Synthetic fuels are a logical route in intermittent demand/supply energy systems on large scale provided they can cope with intermittency
• There are many routes to chemicals and fuels
• There are clearly options on industrial scale in the near future
• What you don’t take out of the earth’s crust will not burn
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Developments in the
Netherlands
• Program DIFFER (Dutch institute for fundamental energy research) – Four themes
– Photons related
– Out of equilibrium processes (plasmas)
– Bio –mimetic photo systems
– Downstream chemical processing
• Follow-up of CATO2 – Capture and re-use and storage
– Main message CO2 is not waste but feedstock
– Small impact: chemicals in industry
– Big impact: energy storage related to intermittent energy sources
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Ready to beat intermittency!
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Thank you for your attention
This research was performed in close cooperation with our Shell partners:
Mary Bastian, Donald Reinalda and Joost Smits.
ECN
Westerduinweg 3 P.O. Box 1
1755 LE Petten 1755 ZG Petten
The Netherlands The Netherlands
T +31 88 515 49 49 [email protected]
F +31 88 515 44 80 www.ecn.nl 38
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ECN
Westerduinweg 3 P.O. Box 1
1755 LE Petten 1755 LG Petten
The Netherlands The Netherlands
T +31 88 515 4949
F +31 88 515 8338
info@ ecn.nl
www.ecn.nl