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RWE Power AG • Liese SEITE 1

Experiences and Results from the RWE Power-to-Gas-Projekt at Niederaußem site

07.11.2013

Dr. Thorsten LiesePOR-AVRWE Power AG

AGCS, München 2013


Excess Power from RE

Elektrolysis

Gas grid

Power generation

CNG

mobilityHeat market

Industrial

usage

Hydrogen

Storage

Hydrogen

MobilityPower

generation

Gasmotor/Fuel cell

utilization options for surplus Power from renewablesources enabled by Power-to-Gas

Water Electrolysis is the key technology of „Power to Gas“ and enables access to many paths of application

Methanisation

GuD/BHKW

Industrial

usage


„Power-to-Gas“ – Power Storage as natural gasPtG stands for the largest capacities of all power storage technologies

> Storage technologies differ in the storage capacity

> flywheel, battery and pumped water pumped storage/compressed air power station offer low storage capacity

> Unique feature of „Power-to-Gas“ is a large storage capacity

> „Power-to-Gas“ connects power and gas grid

> Gas grid and gas storage capacity high storage capacity available


95%

62%

49%42%

17%

0%

20%

40%

60%

80%

100%

Max

Min

Wirkungsgrag

100%

80%

68%

39%

65%

95%

62%

52%

18%

0%

20%

40%

60%

80%

100%

Max

Min

100%

80%

Wirkungsgrag76%

42%

Stromnetz

95%-100%

Elektrolyse

65%-80%

Kompression

85%-95%

Verstromung

35%-55%

Stromnetz

95%-100%

Elektrolyse

65%-80%

Methanisierung

80%-85%

Kompression

85%-95%

Verstromung

40%-60%

Efficiency of energy storage via Power-to-Gas

Power-to-SNG-to-Power

Power-to-H2-to-Power


Power to Gas – Technical basics of PtG

�Elektrolysis

�Methanation


� Elektrolysis is a proven technology

� commercial scale electrolysers designed for maximum production

� Electrolysers not proven for flexible operation regarding reliable operation,

degradation � R&D demand

Electrolysis – key technology

Atmospheric Alkaline electrolysis> In industrial range proven

technology

> Module size > 2 MWel

> turndown up to 20%

> Operational Parameter

- Power: Ø4,5 kWhel/Nm3H2

- Pressure:

atmospheric

- Temperature: 60-80°C

> costs2011 ~ 800-1.000 €/kWel

Pressurized Alkaline electrolysis

> In industrial range proven

technology

> Module size > 3 MWel

> turndown up to 10%



- Pressure: 30-50 bar

- Temperature: 60-80°C

> costs2011 ~1.200-1.600 €/kWel

Membrane-Elektrolysis (PEM)

> Not industrial range proven

technology

> Module size up to 300 kWel

> Turndown up to 0%



- Pressure: 50 bar

- Temperature: 80°C

> costs2011 ~ > 5.000 €/kWel

Ziel


Methanisation plant – key technology

Plant capacity 150 tm3/h SNG (power consumption 24 TWh/a)Cost estimation 100-180 Mio € (Based on simulation, sized Equipments, (costs for Piping, instrumentisation,

engineering, labour costs , insurance, freight etc.) considered factorized approach)


Power to Gas – test setup in Niederaußem


PEM-Elektrolyse *

Strom H2

MethanMethanol

CO2

PCC-Anlage **

KAT-Teststand

Catalytic tests of methanisation of carbon dioxide captured

from flue gas with hydrogen

> Catalysts designed for methanisation of syngas (CO + H2) shall be tested for methanisation ofcarbon dioxide from flue gases with hydrogen

– Can coomercial available catalysts be used for this kind of application?

– Can CO2 captured from flue gases used for methanisation?

> As an alternative path production of methanol from CO2 and H2 will be tested

Synthese-Reaktionen

CO2+ 4 H2 CH4 + 2 H2O

CO2+ 3 H2 CH3OH + H2O

objective

Power-to-Gas bei RWE Power

*PEM-Elektrolyse von Siemens, BMBF-Projekt CO2RRECT**PCC-Pilot-Anlage, BMWi-Projekt

Standort Niederaußem


Catalyst test set up at Niederaußem site

> Catalyst ttesting of comercial

available methanisation and

methanol synthesis catalysts

> Test set up in container

> Test campaign scheduled until Q1/

2014

> H2-Supply: 5 Nm³/h

from gas supply or Elektrolysis

> CO2-supply: 2 Nm³/h

from PCC Pilot plant

> Operation at 20 to 30 bar

> Temperatures depending on

Product (Methanol/Methane)

between 250°C and 640°C

> Reactors for1,5 l of catalyst


Power to Gas – simplified Process flow diagramm


Power to Gas – first results

2000 4000 6000 800070

75

80

85

90

95

100

XC

O2,e

xpe

rim

en

tell/X

CO

2,G

leic

hg

ew

ich

t / %

GHSV / h-1

0 5 10 15 20 250

20

40

60

80

100

XC

O2 /

%

TOS / Tage


Power to Gas – first results

30 35 75 80 850

20

40

60

80

100

ohne Schutzreaktormit Schutzreaktor

XC

O2 /

%

TOS / Tage


Power to Gas – PtG test setup Niederaußem


Power to Gas – economic feasibility


power

demand

RE-infeed

RE-

SurplusP

ow

er

pro

du

cti

on

time

Power

gridgas grid

SNG

RE-Surplus

free of charge

− Assumption: Invest 1.200€/kW, Efficiency about 35%

− Result: Power Production costs >. 50 ct/kWh*, equivalent to 12 times of power

price at stock(4 ct/kWh)

methanationη ≈ 80 – 85 %

Hydrogen

(H2)

CO2

ex. Gas power plant

electrolyserspec. invest

1.200 €/kWEinspeiseleistung

assumed efficiency about 65%

* costs for storage and infrastructure not considered

Costs for Power-to-GasElektrolysis, Methanisation and power production

powergrid


„Power-to-Gas“ – Power storage as SNG in gas grid

�Power consumption in Germany: 500-600 TWh el/a.

�Capacity of natural gas storage facilities in Germany: 200 TWh th. (19 Mrd Nm3)

�Gas consumption in Germany: 95 Mrd Nm3 (1.000 TWh th./a)

�Power demand to fill german gas storages via PtG: 312 TWh el.

�Power demand to produce german gas demand via PtG: 1.550 TWh el.

�Power Production in Germany 2013 (Wind PV): 74 TWh el.

�Estimated RE Excess power according scenario 2050: 50 TWh el.

�50 TWH el. Power converted to gas would be sufficient to supply Germany for 11 days


Thank you very much for your attention!

07.11.2013

experiences and results from the rwe power-to … offices assets/germany/expert...experiences and...

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