Power-to-Gas demonstration plant Ibbenbüren

Transcription

1 Power-to-Gas demonstration plant Ibbenbüren Project description and background information Ulrich Bohn, Florian Lindner September 2015 RWE Deutschland AG SEITE 1

2 Renewable power generation grew significantly during the last years Development of power generation from renewable energy since 1990 Generated electricity [TWh] PV Biomass Wind power Hydropower > The Renewable Energy Law (originated in april 2000) led to intense development of power generation on renewable basis > Main increase in the last years in the sectors wind power, photovoltaics and biomass > Current status: Hydropower: Nearly completely utilised Source: German ministry of economics (2015) Remark: Wind power nearly exclusively wind onshore Biomass: No significant extension expected due to reduced subsidies SEITE 2

3 With a renewable generation target of 80% in 2050, the key challenges are still to come Regenerative generated share (%) of electricity demand ,8 42,5 Reached share Targets of German government *Average values for 2025 and , * 2035* > Further increase only possible by extension of strongly fluctuating sources (wind power and photovoltaics) > Planned development of installed power (2014 to 2035)* Photovoltaics (factor 1,6) from 38 GW to 60 GW Wind onshore (factor 2,3) from 38 GW to 89 GW Both (factor 2,0) from 76 GW to 149 GW In comparision: Load bandwidth in entire Germany approximately between GW (also in the future) * According to the German network development plan 2015 scenario B SEITE 3

4 Level and bandwidth of power generation from renewable sources will increase extremely German demand versus generation from renewables exemplary presentation over 500 hours > Today: Demand always above generation from renewables (at regional level partly already inverted!) Load curve today Regenerative generation today Load curve 2030 Regenerative generation 2030 Gap between green generation and demand filled by existing power plants > Future (2030): Generation from renewables nearly always higher or lower than demand => necessary balance not existing Frequent and expensive shut-downs of plants for renewable generation expected Future availabilty of conventional power plants unclear due to questionable economic situation SEITE 4

5 Power-to-Gas is a long-term option for balancing supply and demand of electricity Influenced area Big > There is not one option that fits all scenarios > Instead, a combination of different methods is getting more and more likely > Single methods do not have to compete with each other a reasonable amendment is probable Small Demand side management Time > Specific application and point in time depend on the achieved status of green generation and grid extension Electricity market Germany Consumption ~ 550 TWh Storage ~ 0,04 TWh Gas market Germany Consumption ~ 870 TWh Storage ~ 240 TWh > In this context usage of Power-to- Gas for electricity storing only expected in the long term SEITE 5

6 Power-to-Gas creates flexibility by connecting the gas and the electricity grid H 2 CH times higher storage capacities in the gas grid compared to power grid Fluctuating electricity from renewable sources Power grid Electrolysis Optional (not at Ibbenbüren) Methanation CO 2 Gas grid Undergroundstorages Already existing Mobility Gas power plant / CHP Heating SEITE 6

7 In Ibbenbüren RWE is piloting a plant to produce hydrogen via electrolysis Compartment of the electrolysis (length 6 m) > Electrolysis with innovative PEM (Proton Exchange Membrane)- Technology > Standard operating point 150 kw (el. consumption) > Production of approx. 30 m³ N /h hydrogen at 14 bar(g) Feed-in into the regional gas grid of RWE Deutschland AG > Production of approx. 15 m³ N /h oxygen vented to surrounding > Electrolysis operated with excl. green electricity SEITE 7

8 Simplified process of the plant Electrolyser (container plant) Atmosphere Oxygen Hydrogen treatment Hydrogen Electricity grid Rectifier + Stack Stack Stack Separator Water (demineralized) Gas grid Gas station Groner Allee Heat Heat exchanger Water treatment Circulation pump Water grid SEITE 8

9 Further details of the plant > Electrolysis built into a 20-ft-Container (length: 6 meter), weight approx. 12 to > Max. overload: ca. 130% based on normal operating point (40 m³ N /h hydrogen) > Purity of hydrogen: 99,9% (requirement for H2-mobility met) > Waste heat of electrolysis used in gas station at a temperature level of 55 C > Total efficiency (electricity and heat): approx. 86% (71% power to H2) > Flexibility: Cold start up within 300 seconds Warm start up immediately Response time within 2 seconds > SIEMENS safety and automation techniques applied (SIEMENS-PLC) > Automated operation via remote control from dispatch centre at WESTNETZ GmbH > TÜV Nord: Certification of plant and safety concept SEITE 9

10 The hydrogen is fed into the local gas station Regional RWE high pressure pipelines > Hydrogen is fed-in at the outlet side of the gas station no further compression needed > Hydrogen together with natural gas is distributed in Ibbenbüren and surrounding > Ideal condition for hydrogen feed in in Ibbenbüren as also in summer high gas volumes are distributed Gas station Groner Allee > No differences in calorific value within the downstream-grid due to one feed in only > Hydrogen is used in CHP in Ibbenbüren connected to the local heating grid CHPs raise overall efficiency Swap into a mixture of natural gas and hydrogen SEITE 10

11 The system solution in Ibbenbüren reduces energy losses by a high degree of cross-linking First step of energy conversion Power grid Electricity Heat Hydrogen Gas grid Natural gas Power to Gasplant Underground storage In both steps of conversion utilisation of waste heat Natural gas Electricity (after storage process) CHP Heat Local heating grid Second step of energy conversion SEITE 11

12 Multiple utilisation of waste heat increases total efficiency substantially up to 75% Sum = 46% Utilisation of heat (related to beginning of process) 15% 31% H2 ~71% therm ~15% + - Heat ~99% el ~41% therm ~44% Heat 100% Electricity 71% 70% H 2 CH 4 + H 2 29% Electrolysis Electricity Gas grids & storages CHP Electricity Losses (related to beginning of process) 14% 1% 10% Sum = 25% SEITE 12

13 The project contributes to the development and deployment of the Power-to-Gas technology > Gain operational experience for electrolysis in the context of renewable energy First PtG plant in Germany with Waste heat concept Direct feed-in into a 16 bar regional gas transportation system without additional hydrogen compression Second electrolysis with innovative PEM-Technology in Germany; Technology advancement with regard to: Efficiency of stacks and power electronics Stack size (reduced costs) and purity of hydrogen Plant engineering (simplified) > The project will contribute to further cost reduction and increase in efficiency etc. > Commercially: Check and validation of business models in the field of power to gas SEITE 13

14 Thank you for your attention SEITE 14