1.A.3.e Pipeline Compressors

Last updated on 24 Jan 2013 17:05 by Kevin Hausmann

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

Since no national statistic for compressor stations is available, fuel data are taken from German emission trading - for all years from 2005 on. From 1995 - 2001 there was a statistic available, which comprised fuel data for compressor stations. But the comparison with the ETS data suggests that the statistic was never complete. In order to get a consistent time serie a recalculation until 1990 was necessary. It´s known that the fuel consumption of compressor stations depends on the transfered natural gas amount. Therefore a calculation was made to determine a factor which reflects the relationship between the fuel consumption of all compressor stations and the primary energy consumption. In this way it was possible to ajust the time serie for the years 1990 - 2004 by multiplying the annual primary energy consumption of natural gas by the calculated factor.

Table: Annual natural gas consumption in gas turbines of pipeline compressors, [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

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 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: Emission factors for Pipeline compressors

Pollutant SOx NOx TSP
Fuel [kg/TJ]
Natural gas 0.5 161 0.4

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 trend overall. Annual fluctuations due to the varying primary energy consumption. The maximum fuel consumption occured in 2006, which was the year of the highest primery energy consumption of natural gas in Germany. Thereafter, natural gas consumption decreases considerably.

Recalculations

AD: The entire time series of natural gas consumption in pipeline compressors was recalculated based on newly available ETS data for all years from 2005.
New AD for years 1990 to 2004 was computed from the primary energy consumption of natural gas and information from ETS data. As result, consumption data increased strongly for most years.

Table: Recalculated natural gas consumption data 1990-2009

Unit 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999
Submission 2012 [TJ] 19.449 20.437 20.205 21.381 21.772 23.740 26.566 25.379 25.612 25.537
Submission 2011 [TJ] 11.405 12.024 11.873 12.610 12.800 13.050 15.465 14.198 14.281 16.852
absolute change [TJ] 8.044 8.413 8.332 8.771 8.972 10.690 11.101 11.181 11.331 8.685
relative change [%] 71 70 70 70 70 82 72 79 79 52
Unit 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
Submission 2012 [TJ] 25.324 26.706 28.689 26.988 27.125 26.778 30.453 24.581 26.215 24.485
Submission 2011 [TJ] 14.630 16.344 28.689 15.907 15.988 16.144 16.306 15.608 15.292 14.684
absolute change [TJ] 10.694 10.362 0 11.081 11.137 10.634 14.147 8.973 10.923 9.801
relative change [%] 73 63 0 70 70 66 87 57 71 67

EF: Based on new information, the entire EF time series for NOx was revised.

Planned improvements

At the moment, no category specific improvements are planned.


Bibliography
1. AGEB, 2011: Arbeitsgemeinschaft Energiebilanzen (Hrsg.): Energiebilanz für die Bundesrepublik Deutschland; URL: http://www.ag-energiebilanzen.de/viewpage.php?idpage=63, (Aufruf: 12.01.2012), Köln, Berlin.
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