Operational and Economical Experiences of the worldwide largest Power-to-Gas plant with PEM electrolysis

Transcription

1 Operational and Economical Experiences of the worldwide largest Power-to-Gas plant with PEM electrolysis Heat and Electricity Storage 4 th Symposium Birgit Scheppat University of Applied Science RheinMain 24. und 25. Oktober 2016, Luzern Schweiz Authors: M. Kopp, C. Stiller, K. Scheffer, J. Aichinger and B. Scheppat 1

2 1. Project status and key facts o Project scope and key facts/ Objectives and timeline/ Layout, components 2. Operational experiences o Electrolyzers for grid optimization/evaluation of measurements/sankey-diagram o 10% hydrogen in the local gas grid 3. Outlook 2

3 Energiepark Mainz timeline Approval planning done Begin of the research operations First idea Start Engineering Awarding the contact to build the plant Start of construction Finale approval Dispatch durch DV Balancing of the grid Proposal for the energy call German goverment Proposal excepted Start of the information of the regulatory authorities Start of construction (BImSchG) Request for authorisation Delivery elektrolysis Start gas distribution into the local gas grid Start of process engineering 3

4 Project status and operational experiences Project scope and key facts Development of an decentralized hydrogen energy storage plant Location: Mainz (Germany) Partners Stadtwerke Mainz, Linde, Siemens, Hochschule RheinMain Connected to a wind-farm (8 MW) 6.3 MW peak electrolyzer (3 stacks, each 2.1 MW) 1000 kg H 2 storage (33 MWh) 200 tons H 2 target annual output Injection in local gas grid Multi-use trailer-filling Budget: total 17 m Funding: ~50% (BMWi) Timeline: 4 years (10/ /2016) Mainz Source: Wikipedia Source: Energiepark Mainz 4

5 The objectives of the project: Grid services for the electricity storage out of renewable electricity. Provision of balancing energy for the grid (incl. negative balancing energy) Smart control and communication system Monitor the hydrogen concentration (10%) in a local gas grid and the effect on the terminal devices First trials and developments of a Megawatt class PEMelektrolysis Smart and efficient hydrogen conditioning, storage, handling and distribution Dissemination and public relation to the local/national citizenship 5

6 Planning of infrastructure and civil engineering Infrastructure for components: Grid connection (20 kv) Water supply Gas grid injection Drain Traffic On site transport issues. Safety measures: Fire protection Explosion prevention Noise protection Access control Source: Energiepark Mainz 6

7 Hydrogen storage and handling facility Storage volume 2x 82 m³ Net-storage capacity Gas quality input (vol.%) Gas quality output (vol.%) 780 kg / 26 MWh <0.5% O 2 <3.0% H 2 O <0.0002% O 2 <0.0005% H 2 O 7

8 Electrolysis Three electrolysis units (SILYZER 200) Electrical power consumption: 1.3 MW continuos 2.1 MW time limited peak load H 2 output pressure level of up to 3.5 MPa Highly dynamic operation over a broad load range (ramp speed 10% per sec.) Widely adjustable DC power supply Source: Energiepark Mainz 8

9 Energiepark Mainz Ionischer Verdichter 2-stage compressor (ionic fluids, 2 cylinders per stage) Integrated gas drying Max. feed rate 1250 Nm³/h; 112 kg/h Min. suction pressure 15 bar Max. final pressure 250 bar Max. power 350 kw Full load range % Multivariable operations 9

10 H 2 -injection into a natural gas (distribution) grid municipal gas pipelines to the city district Mainz-Ebersheim: Owner: Stadtwerke Mainz AG Operating pressure: MPa Volume flow: max. 1,000 m³/h In summer minimal flow rate limited feed-in possibility. Source: Energiepark Mainz H 2 -trailer filling stations 2 positions + 1 parking lot Fully-automatic operation H 2 pressure in the trailers is up to 22.5 Mpa Loading time is ~3 4 hours Source: Energiepark Mainz 10

11 1. Project status and key facts o Project scope and key facts/ Objectives and timeline/ Layout, components 2. Operational experiences o Electrolyzers for grid optimization/evaluation of measurements/sankey-diagram o 10% hydrogen in the local gas grid 3. Outlook 11

12 Electrolyzer for grid optimization Fast-responding, modern PEM-Electrolyzers can be used to transform excess power to hydrogen System can manage local grid bottlenecks and provide balancing power Mandatory pre-qualification test for the participation at the secondary control reserve market is successfully passed Soll-Leistung Target Performance Ist-Leistung 6'000 5'000 Power [kw] 4'000 3'000 2'000 1'000-13:00 13:15 13:30 13:45 14:00 Reference: Siemens AG 12

13 Operational experiences Operation in 2015: Electricity purchase at EPEX Spot market 1,172 MWh power procured 13.4 tons hydrogen produced Expectations considering system dynamic and power consumption are met No critical breakdown Month Electricity [MWh] Hydrogen [tons] H 2 (HHV) [MWh] Utilization factor (HS) Operating hours Sept (416.7)* * without Standby-losses (<50kW of the total plant) % (61.6%)* 146 h Database: electricity meter of the grid operator; weighing documents of the truck trailers Calculations of the efficiency are referring to the higher heating value of hydrogen (3.54 kwh/nm³) 13

14 Evaluation of measurements H2 Production Efficiency Considering the total power consumption of the plant and the produced hydrogen Efficiency is referred to the caloric value of the hydrogen (3.54 kwh/nm³) Raw data set of October 2015 Hydrogen production [Nm³/h] Total power consumption [kw] 100% 80% 60% 40% 20% 0% Efficiency 14

15 Evaluation of measurements Sankey-Diagramm of the PtG plant during a constant operation at 4 MW and during the filling of a truck trailer. The main energy consumption remains within the electrolysis process. Other consumers like transformers, rectifiers, the ionic compressor and ancillary components have a share of only 6.5% of the total power consumption. Power consumption of 4 MW 15

16 1. Project status and key facts o Project scope and key facts/ Objectives and timeline/ Layout, components 2. Operational experiences o Electrolyzers for grid optimization/evaluation of measurements/sankey-diagram o 10% hydrogen in the local gas grid 3. Outlook 16

17 Daily Gas consumption during the year (data 2014) Variable gas consumption during a day and over the year In summer a stop of the feed is possible, reason: very low consumption in the grid or the verification limit of the calibration is reached. 17

18 H2-Gasnetzeinspeisung municipal gas pipelines to the city district Mainz-Ebersheim Owner: Stadtwerke Mainz AG Operating pressure MPa Volume flow: max. 1,000 m³/h In summer minimal flow rate limited feed-in possibility. 18

19 Scheme of the H2/gas grid admixture unit: function, measurement and billing Up to 10% H2 addition Fault monitoring Valves Fault monitoring Electro pneumatic control pressure unit Operating flow control (gas meter protection) H2 Methan/H2 Control of the standard flow Control of the outlet pressure(pamax) Methan/H2 Caloric metering for measuring of the heating value (customer billing) Methan 19

20 Calculation of the caloric value and the wobbe index at 10% H2 20

21 Adjustment of the H2 Admixture for a given concentration Adjustment of the H2 -oncentration from 2% auf 5 % Methan volume flow 2 % Admixture H2 volumen flow 5 % H2 Admixture 21

22 1. Project status and key facts o Project scope and key facts/ Objectives and timeline/ Layout, components 2. Operational experiences o Electrolyzers for grid optimization/evaluation of measurements/sankey-diagram o 10% hydrogen in the local gas grid 3. Outlook 22

23 Thank you! Further information: Contact: Birgit Scheppat RheinMain University of Applied Sciences Am Brückweg Rüsselsheim; Germany 23

24 24

25 Energiepark Mainz Project status and outlook Project partners The Linde Group World-leading gases and engineering company with 62,000 employees in more than 100 countries. Linde "Clean Technology" offers a wide range of technologies to render renewable energy sources; ranges from CO2 separation to alternative energy carriers such as LNG and hydrogen. Stadtwerke Mainz AG Municipal energy supplier on the German market (shareholder is the city of Mainz). Supply of energy (electricity, gas, heat), water and mobility to the city of Mainz and the region. Pursuing a sustainable change in energy policy for a number of years. Siemens AG Global powerhouse in electrical engineering and electronics; world's largest environmental tech provider In its Drive Technologies Division, Siemens is developing a PEM hydrogen electrolysis system. The RheinMain University of Applied Sciences Regional stronghold for research on hydrogen and fuel cell technology. Involved in several related projects and networks of excellence. 25