Flexible power and synthesis plant
concepts with integrated chemical power
storage
Dipl.-Ing. Alexander Buttler
MSE colloquium, 04.07.2013
MSE colloquium, Alexander Buttler
05.07.2013
Structure
• Project HotVeGas
• Future challenges for conventional power plants
• Power-to-Gas Technology
• Analysis of IGCC-EPI concept
• Conclusion
MSE colloquium, Alexander Buttler
05.07.2013
Research Project Overview HotVeGas II – Future high
temperature gasification and gas cleaning processes
3
Gasification Kinetics
• Kinetics at high temperature (1800°C) and high
pressure (50 bar)
• Development of reaction models for heterogeneous
char gasification
Cooling Behavior of Trace Elements
• Condensation behaviour of trace elements
• Deposition of trace elements on probes
CFD - Modeling
• Design of pyrolysis and gasification models
• Particle tracking and slag flow modeling
• Modeling of condensation of trace elements
Overall Process Evaluation
• Flexible IGCC-concepts with polygeneration
and excess energy storage
• Biomass co-gasification
• Potential of future technologies
Gasifier Gas cleaning
Synthesis Electrolysis
Combined Cycle
Storage
MSE colloquium, Alexander Buttler
05.07.2013
• Project HotVeGas
• Future challenges for conventional power plants
• Power-to-Gas Technology
• Analysis of IGCC-EPI concept
• Conclusion
Structure
MSE colloquium, Alexander Buttler
05.07.2013
Future development of energy system in Germany
5
2050
Load
[G
W]
Residual load
2012
Load
[G
W]
Residual load
23% RE 80% RE (Energy policy goal of the German government)
80
40
0
80
40
0
-40
MSE colloquium, Alexander Buttler
05.07.2013
2050 – Sorted annual load curve P
ow
er
[GW
]
Future challenges for conventional power plants
6
Decreased utilization
Increased flexibility requirement
Excess energy storage
Challenges:
MSE colloquium, Alexander Buttler
05.07.2013
• Project HotVeGas
• Future requirements for conventional power plants
• Power-to-Gas Technology
• Analysis of IGCC-EPI concept
• Conclusion
Structure
MSE colloquium, Alexander Buttler
05.07.2013
Power to gas technology
8
CO, CO2
SNG
Steam (Tmax=650oC) O2
Electrolysis Synthesis Electrical
Energy
+ High energy density
+ Full use of the existing NG infractructure
+ Reconversion with state of the art
technology possible
- High costs
- Low power-to-power efficiency
Advantages Disadvantages
H2
MSE colloquium, Alexander Buttler
05.07.2013
Motivation for system integration concepts
9
CO, CO2
SNG
Steam (Tmax=650oC) O2
Electrolysis Synthesis Electrical
Energy
H2
Possibilities for efficiency enhancement:
- Use of the byproduct O2 of the electrolysis
- Integration of the CO/CO2 source
- Use of the heat of the exothermal synthesis
- CHP plant for reconversion of the SNG
ȠPowerPower=0,7 x 0,95 x 0,8 x 0,6= 32 %
ȠElectrolysis ȠSNG
ȠCO2 ȠCC
Overall efficiency of P2G:
MSE colloquium, Alexander Buttler
05.07.2013
IGCC-EPI (Excess Power Integration) concept
Gasifier Quench-
HRSG
Synthesis
Gas
turbine
Electrolysis Gas grid O2-
Storage ASU H2-Storage
HRSG Coal
Exhaust gas
SNG
O2 H2
O2
H2
Excess power
0-100%
0-100% 0-100%
0-100%
50-100%
100%
𝐇𝟐 − 𝐂𝐎𝟐𝐂𝐎 + 𝐂𝐎𝟐
= 𝟑
El.
Energy
El. Energy El. Energy
Steam turbine,
condensator
10
AGR
Features:
+ High positive and negative flexibility at baseload operation of the gasifier island
+ No CO-Shift reactor and CO2 sequestration for adjustment of synthesis gas
composition conversion losses and investment costs can be avoided
+ Integration of O2 from electrolysis for gasification
+ Integration of the heat of the synthesis plant in the CCPP
Storage
H2S
O2
CCPP
Gasifier Island
MSE colloquium, Alexander Buttler
05.07.2013
Structure
• Project HotVeGas
• Future requirements for conventional power plants
• Power-to-Gas Technology
• Analysis of IGCC-EPI concept
• Conclusion
MSE colloquium, Alexander Buttler
05.07.2013
Methodology – Overall System Evaluation
12
Literature-
research
• Process schemes
• Process parameters
• Limitations
Modeling of
sub systems
Verfication of
Subsystems
Reference: Industrial data from a 20 MW TREMP process
Overall system Analysis
Optimization
• Energetic
• Exergetic
• Economic
MSE colloquium, Alexander Buttler
05.07.2013
Main boundary conditions of the simulation of a 125
MWth concept
13
Part load behavior:
Storage properties:
SNG feed in pressure: pSNG=60 bar
Mean O2 storage pressure: pO2=75 bar
Specific energy consumption of the electrolyzer: ES,Elektrolyse=4,4 kWh/Nm3 (400 mA/cm2)
70
75
80
85
90
95
100
40 60 80 100
rela
tive
eff
icie
ncy
[%
]
load fraction [%]
Meerman (2004)
Kim (2004)
Zhang (2002)
mean value
Gas turbine Electrolysis
MSE colloquium, Alexander Buttler
05.07.2013
Overall system part-load efficiency (including
reconversion of storage medias to power)
14
-300
-250
-200
-150
-100
-50
0
50
100
20
25
30
35
40
45
50
55
60
0 20 40 60 80 100
Net
po
we
r o
utp
ut
[MW
]
Eff
icie
ncy
(to
po
we
r) [%
]
Synthesis gas extraction [%]
Efficiency definition:
ηPower/coalpower
MSE colloquium, Alexander Buttler
05.07.2013
Impact of synergies on overall storage efficiency
15
30
32
34
36
38
40
42Ef
fici
ency
( t
o p
ow
er)
[%]
CO2-sequestration
O2-integration
Heat integration
Synergy effects
Coal-SNG-Power IGCC-EPI 100% Storage case
PtG
Coal
Electricity 100% 30% 0%
0% 70% 100%
Input:
Synergy effects result in an overall efficiency advantage of 6.4% points
MSE colloquium, Alexander Buttler
05.07.2013
• Project HotVeGas
• Future requirements for conventional power plants
• Power-to-Gas Technology
• Analysis of IGCC-EPI concept
• Conclusion
Structure
MSE colloquium, Alexander Buttler
05.07.2013
Conclusion
• Increased flexibility requirements for future conventional power
plants
• High excess power potential and need for long-term energy
storages
• Combination of power-to-gas and gasification technology results in:
– Superior opertation range of conventional power plant
– High overall storage efficiency due to synergy effects
17
Thank you for your kind attention.
Questions???
18
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