Gas Quality E.ON Gastransport SIMONE Congress 2008, Dubrovnik Jörg Bödeker, Dr. Dietrich Weise

2Gas Quality Reconstruction at E.ON Gastransport [SIMONE Congress 2008] Jörg Bödeker, Dr. Dietrich Weise E.ON Gastransport GmbH Germany's leading gas transmission company founded in 2004 as a subsidiary of E.ON Ruhrgas AG legal ownership of pipeline system since 2008 actually approx. 280 employees

3Gas Quality Reconstruction at E.ON Gastransport [SIMONE Congress 2008] Jörg Bödeker, Dr. Dietrich Weise total length: km compressor stations: 28 compressor power: 900 MW >1000 exit points >100 gas quality measurements High Pressure Pipeline System underground storage facility compressor station field station gas import point

4Gas Quality Reconstruction at E.ON Gastransport [SIMONE Congress 2008] Jörg Bödeker, Dr. Dietrich Weise Use of SIMONE at E.ON Gastransport Linux (Dispatching System) Online reconstruction (PRSIM) Cyclic look-ahead simulation (ZYSIM) Compressor fuel consumption optimization (ZYKOPT…) Test calculations (VOSIM…) Windows Capacity determination Network planning

5Gas Quality Reconstruction at E.ON Gastransport [SIMONE Congress 2008] Jörg Bödeker, Dr. Dietrich Weise Gas Quality Tracking Systems: Regulatory requirements in Germany authority permission by the boards of weights and measures technical approval by the national metrology institute (PTB) complete system is treated like a gauged measurement device verified measurement instruments for input values, e.g.: 1% for volume measurement 1% for superior calorific value measurement 0,5% for normal density measurement

6Gas Quality Reconstruction at E.ON Gastransport [SIMONE Congress 2008] Jörg Bödeker, Dr. Dietrich Weise Validation of Gas Quality Tracking Results reference measurement points at critical line sections (e.g. blending or transition zones) use of approved process gas chromatographs (12 components) validation is based on daily average values for: Superior calorific value H s : 1% Gas law deviation factor K: 0,8% at 100 bar and 0°C, AGA-8 (K is dependant on the gas composition, K = Z/Z n ) Normal density n : 0,5%

7Gas Quality Reconstruction at E.ON Gastransport [SIMONE Congress 2008] Jörg Bödeker, Dr. Dietrich Weise Features of the Reconstruction System One network model for dispatching and reconstruction Input data from two independant systems (dispatching and data retrieval system) Calculation in 3 minute time steps (important for mixing stations) Calculation of calorific value, normal density and gas composition for each exit point in hourly and daily granularity Approval for daily average values Automatic hourly reconstruction calculation with time offset (6 hours) Preliminary daily values (D+1) Final daily values for billing purposes (2nd day M+1)

8Gas Quality Reconstruction at E.ON Gastransport [SIMONE Congress 2008] Jörg Bödeker, Dr. Dietrich Weise Typical Calorific Values Low Calorific Gas (L-Gas Market Area) 9,6.. 10,3 kWh/m³ (34, MJ/m³) High Calorific Gas (H-Gas Market Area) 11,1.. 11,8 kWh/m³ ( ,5 MJ/m³) August 2008

9Gas Quality Reconstruction at E.ON Gastransport [SIMONE Congress 2008] Jörg Bödeker, Dr. Dietrich Weise Network representation in SIMONE More than… 8000 nodes 1000 exit points 50 supply nodes 5900 pipes 2900 valves 200 control valves Relevant area (red) in current project: 200 offtake nodes 12 reference points

10Gas Quality Reconstruction at E.ON Gastransport [SIMONE Congress 2008] Jörg Bödeker, Dr. Dietrich Weise Example for a reference point

11Gas Quality Reconstruction at E.ON Gastransport [SIMONE Congress 2008] Jörg Bödeker, Dr. Dietrich Weise Example for a reference point – simplified view Gas quality reference relative normal density: approx. 0,64 superior calorific value: approx. 9,65 kWh/m³ relative normal density: approx. 0,62 superior calorific value: approx. 9,75 kWh/m³ exit point quantities in 10³ m³/h exit quantity values over 2 weeks

12Gas Quality Reconstruction at E.ON Gastransport [SIMONE Congress 2008] Jörg Bödeker, Dr. Dietrich Weise Night Example for a reference point, different flow situations Gas quality reference medium offtake Gas quality reference high offtake Day Gas quality reference low offtake Sunday

13Gas Quality Reconstruction at E.ON Gastransport [SIMONE Congress 2008] Jörg Bödeker, Dr. Dietrich Weise Reference point: Superior calorific value H s results for one month, absolute daily values

14Gas Quality Reconstruction at E.ON Gastransport [SIMONE Congress 2008] Jörg Bödeker, Dr. Dietrich Weise Reference point: Superior calorific value H s results for one month, relative deviation

15Gas Quality Reconstruction at E.ON Gastransport [SIMONE Congress 2008] Jörg Bödeker, Dr. Dietrich Weise Reference point: Gas law deviation factor K results for one month, absolute daily values

16Gas Quality Reconstruction at E.ON Gastransport [SIMONE Congress 2008] Jörg Bödeker, Dr. Dietrich Weise Reference point: Gas law deviation factor K results for one month, relative deviation

17Gas Quality Reconstruction at E.ON Gastransport [SIMONE Congress 2008] Jörg Bödeker, Dr. Dietrich Weise Reference point: Normal density n results for one month, absolute daily values

18Gas Quality Reconstruction at E.ON Gastransport [SIMONE Congress 2008] Jörg Bödeker, Dr. Dietrich Weise Reference point: Normal density n results for one month, relative deviation

19Gas Quality Reconstruction at E.ON Gastransport [SIMONE Congress 2008] Jörg Bödeker, Dr. Dietrich Weise Overview functionality for result and input data survey in the gas quality reconstruction system problem: large amount of data solution: hierarchical data model & aggregated status information existing hierarchical data model in the dispatching system: 1. type of value 2. network 3. station 4. group 5. unit 6. equipment 7. signal

20Gas Quality Reconstruction at E.ON Gastransport [SIMONE Congress 2008] Jörg Bödeker, Dr. Dietrich Weise Hierarchical Overview (used for input data and calculation results)

21Gas Quality Reconstruction at E.ON Gastransport [SIMONE Congress 2008] Jörg Bödeker, Dr. Dietrich Weise Hierarchical Overview – filtered view (used for input data and calculation results)

22Gas Quality Reconstruction at E.ON Gastransport [SIMONE Congress 2008] Jörg Bödeker, Dr. Dietrich Weise Special time variation curves / tables (used for input data and calculation results)

23Gas Quality Reconstruction at E.ON Gastransport [SIMONE Congress 2008] Jörg Bödeker, Dr. Dietrich Weise Conclusion experts are essential for routine operations and maintenance processing time very long – 8 hours for one month (2 hours calculation + 6 hours data transfer via SIMONE API) results of tracking system improve and simplify billing operation and balancing reduced investment in additional gas quality measurement instruments new data analysis features help to improve overall quality (network model and data)

24Gas Quality Reconstruction at E.ON Gastransport [SIMONE Congress 2008] Jörg Bödeker, Dr. Dietrich Weise E.ON Gastransport GmbH Thank you for your attention. For further information: E.ON Gastransport GmbH Kallenbergstr. 5 D Essen Jörg Bödeker T: +49 (201) – Dr. Dietrich Weise T: +49 (201) 184 –