1.A.3.e Pipeline Compressors

Last updated on 10 Dec 2013 11:53 (cf. Authors)

Short description

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Under category 1.A.3.e - Pipeline Compressors emissions from compressors in pipeline transport of natural gas are reported.

NFR-Code Name of Category Method AR EF Key Source for (by1)
1.A.3.e Pipeline Compressors T2 NS CS no key source

1 T = key source by Trend / L = key source by Level

Method

Activity data

In past years, statistical fuel consumption data was used. But a comparison with data from German ETS (available as of 2005) exposed several inconsistencies within these statistics.

Therefore, as the fuel consumption of a compressor station depends strongly on the amount of transferred natural gas, a conversion factor was derived reflecting the relation between the fuel consumption of all compressor stations and the primary energy consumption of natural gas within Germany. Using this conversion factor, the insufficient statistical data could be replaced by much more solid estimates for the years 1990 to 2004 whereas for 2005+ the abovementioned ETS data is used.

Table: Annual natural gas consumption, [TJ]

1990 1991 1992 1993 1994 1995 1996 1997 1998 1999
19,449 20,437 20,205 21,381 21,772 23,740 26,566 25,379 25,612 25,537
2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
25,324 26,706 28,689 26,988 27,125 26,778 30,453 24,581 26,215 24,485
2010 2011 2012 2013 2014 2015 2016 2017 2018 2019
21,301 21,822

Emission factors

The emission factors for pipeline comporessors have been taken from the research project "Determination and evaluation of emission factors for combustion systems in Germany for the years 1995, 2000 and 2010". A detailed description of the procedure is presented in Chapter: 1.A.1.a - Public Electricity And Heat Production.
Compressor stations, in Germany mostely gasturbines are responsible for maintaining a constant pressure in the pipline. Basically they work discontinuously which causes relatively high specific emissions. In order to reflect this point the German law allows exemptions for installations with a low level of utilization.

Table: EF used for 2011 emission estimates

Pollutant NOx SOx CO TSP
EF [kg/TJ] 142 0.5 53 0.40

Trend discussion for Key Sources

The following diagram gives an overview of the fuel consumption in NFR 1.A.3.e

Since 1990 fuel consumption has shown an increasing overall trend. Annual fluctuations are due to the varying primary energy consumption. The maximum fuel consumption occured in 2006, the year with the so far highest German total primary energy consumption of natural gas. Thereafter, natural gas consumption decreases considerably.

Recalculations

As both AD and EFs remain unchanged compared to submission 2012, no recalculations had to be carried out.

For pollutant specific information on qualitative and quantitative impacts on 1990 and 2010 emission estimates see chapter 11. Recalculations.

Planned improvements

At the moment, no category specific improvements are planned.


Bibliography
1. AGEB, 2012: Arbeitsgemeinschaft Energiebilanzen (Hrsg.): Energiebilanz für die Bundesrepublik Deutschland; URL: http://www.ag-energiebilanzen.de/viewpage.php?idpage=63, (Aufruf: 12.11.2012), Köln, Berlin.
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