flexible power and synthesis plant concepts with

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


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


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• Future challenges for conventional power plants



• Conclusion

Structure


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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


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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:


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• Future requirements for conventional power plants



• Conclusion

Structure


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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


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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:


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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


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Structure





• Conclusion


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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


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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


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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


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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


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• Conclusion

Structure


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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

flexible power and synthesis plant concepts with

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