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Gas Quality Measurement Peter Schley marcogaz, Paris 13 September 2007
Gas Quality MeasurementPeter Schley
marcogaz, Paris13 September 2007
Seite 221. April 2023
Gas Quality Measurement
Energy billing(superior calorific value, normal
density, gas composition)
V
p
xi
Hs,nE = Vn · Hs,n
Vb
Quality control(dewpoint, sulfur, etc.)
T
Vn = Vb · UZ
Seite 321. April 2023
Gas Property Data from Measurement Stations
Gas composition
CH4 ... C6+, N2, CO2
Superior calorific value
Normal density
Sulfur and sulfur compounds
H2S, COS, mercaptans Total sulfur
Water dewpoint / Hydrocarbon Dewpoint
Process gas chromatograph
Sulfur GC
Water dewpoint
The gas properties of the main natural gas flows are
measured continuously, stored on an hourly basis
and retrieved monthly.
Seite 421. April 2023
Analyses up to C14
(in special cases up to C40)
Sulfur compounds
Water dewpoint
Hydrocarbon dewpoint
Other trace components
Laboratory Analysis
(Gas Quality Competence Centre)
Laboratory analyses are made several times a year at
entry points and at storage facilities during withdrawal.
Seite 521. April 2023
Limit Values to G 260 (Germany) - EASEE GAS
12.8 to 15.7 (group H gas)
0.55 to 0.75
Max. ground temperature
Max. ground temperature
Dry: 3%; wet: 0.5%
30 mg/m³
6 mg/m³; 16 mg/m³ (temp)
5 mg/m³; 10 mg/m³ (temp)
Not specified
EASEE Gas
Wobbe index in kWh/m3
Relative density d
Hydrocarbon dewpoint
Water dewpoint
CO2
Oxygen (O2)
Total sulfur (S)
Mercaptans (R-SH)
Hydrogen sulfide (H2S)
Carbon oxysulfide (COS)
13.6 to 15.81
0.555 to 0.700
- 2 °C (1-70 bar)
- 8 °C (70 bar)
2.5 mol%
0.01 mol%
30 mg/m³
6 mg/m³
Total 5 mg/m³
Properties DVGW Code G 260
Seite 621. April 2023
Future Requirements for Gas Quality Determination (1)
Injection of biogas, liquefied natural
gas (LNG), hydrogen
( additional gas constituents)
Growing gas trade leads to
stronger variations in gas quality
( gas quality transition zones)
Seite 721. April 2023
Future Requirements for Gas Quality Determination (2)
Prompt and location-specific determination of gas quality
increasingly important
More flexibility required
Computer-assisted simulation tools to trace gas quality
(gas quality reconstruction system)
Existing measurement technology to be developed further
and optimised in terms of costs
Seite 821. April 2023
Gas Quality Reconstruction System Being Developed atE.ON Ruhrgas
E.ON Ruhrgas filed an application with PTB (verification authorities) in June 2006 for approval of the system for part of the pipeline network.
Seite 921. April 2023
Principle of Gas Quality Tracing System
Subsequent calculation of
superior calorific value Hs
normal density n
gas composition xi (11 constituents)
for delivery stations
Input data for calculation
Hs, n, xi at entry points
Volume flow at entry points
Volume flow at exit points
Grid topology
Auxiliary data (pressure, ...)
Seite 1021. April 2023
PGC technology Design to be modified to include additional constituents (inter alia, O2, H2 for biogas) Outlook: multi-function PGCs for billing and quality control (inter alia, sulfur, hydrocarbon dewpoint)
Correlative measurement systems / sensor measurement systems Development of simple measurement systems for biogas
(e.g. based on infrared technologyexample: INCA, Union)
Further optimisation of costs
Improvement of Measurement Technology
Seite 1121. April 2023
Conclusion / Outlook
Growing natural gas trade and injection of, for example, LNG or biogases lead to stronger gas quality variations in terms of time.
Prompt determination of the relevant gas property data has therefore become increasingly important.
Computer-assisted simulation (gas quality tracing systems) and improved measurement technology will help to meet future requirements.
Thank you for your attention.
Gas Quality CentreAccredited calibration laboratory / state-approved test
centre
