Gas Quality Reconstruction

@ 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: 11.600 km

compressor stations: 28

compressor power: 900 MW

>1000 exit points

>100 gas quality measurements

High Pressure Pipeline System

underground storage facility

compressor station

Bocholt

Berlin

Aachen Cologne

Koblenz

Trier

Saarbrücken

Frankfurt

Würzburg

ZwickauGießen

Winterberg

Bielefeld

Hanover

Emsbüren

Meppen

BremenBremerhaven

Hamburg

Lübeck

Flensburg

Bamberg

Nuremberg

RegensburgKarlsruhe

Munich

Stuttgart

Freiburg

Essen

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 Hs: 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/Zn)

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 compositionfor 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(34,5 .. 37 MJ/m³)

High Calorific Gas(H-Gas Market Area)

11,1 .. 11,8 kWh/m³(40 .. 42,5 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 qualityreference

60

30

0..50relative normal density:

approx. 0,64superior calorific value:

approx. 9,65 kWh/m³

relative normal density:approx. 0,62superior calorific value:approx. 9,75 kWh/m³

exit point

30..80

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 qualityreference

mediumofftake

Gas qualityreference

highofftake

Day

Gas qualityreference

lowofftake

Sunday

13Gas Quality Reconstruction at E.ON Gastransport [SIMONE Congress 2008] Jörg Bödeker, Dr. Dietrich Weise

Reference point: Superior calorific value Hs

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 Hs

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 GmbHKallenbergstr. 5D-45141 Essen

Jörg Bödekerjoerg.boedeker@eon-gastransport.comT: +49 (201) 27 87 – 24 26

Dr. Dietrich Weisedietrich.weise@eon-gastransport.comT: +49 (201) 184 – 50 34

www.eon-gastransport.com