Gas Quality Reconstruction @ E.ON Gastransport SIMONE Congress 2008, Dubrovnik Jörg Bödeker, Dr....

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


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


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


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


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%


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)


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


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


Example for a reference point


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


Night

Example for a reference point, different flow situations


mediumofftake


highofftake

Day


lowofftake

Sunday


Reference point: Superior calorific value Hs

results for one month, absolute daily values


Reference point: Superior calorific value Hs

results for one month, relative deviation


Reference point: Gas law deviation factor K



Reference point: Normal density n



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


Hierarchical Overview

(used for input data and calculation results)


Hierarchical Overview – filtered view



Special time variation curves / tables



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)


E.ON Gastransport GmbH

Thank you for your attention.

For further information:

E.ON Gastransport GmbHKallenbergstr. 5D-45141 Essen

Jörg Bö[email protected]: +49 (201) 27 87 – 24 26

Dr. Dietrich [email protected]: +49 (201) 184 – 50 34

www.eon-gastransport.com

Gas Quality Reconstruction @ E.ON Gastransport SIMONE Congress 2008, Dubrovnik Jörg Bödeker, Dr....

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