Biomethane standards Gas quality standardisation of biomethane, going from national to international level

Transcription

1 Biomethane standards Gas quality standardisation of biomethane, going from national to international level Dr. Mattias Svensson Swedish Gas Technology Centre European workshop Biomethane, Brussels 11 March 2014 IEE/10/235 GreenGasGrids The sole responsibility for the content of this publication lies with the authors. It does not necessarily reflect the opinion of the European Union. Neither the EACI nor the European Commission are responsible for any use that may be made European of the information workshop contained biomethane therein Svensson Biomethane Standards 1

2 National biomethane standards* Most biomethane standards are gas grid injection specs, predominantly in European countries Outside Europe: SoCalGas, Rule 30 more strict than the European ones Swedish SS :1999 only one for direct utilization of biomethane as vehicle fuel Despite international work: national standards still important, and still revisioned CEN work succeeding or not still an open *Compilated public information available in Marcogaz report (2006) Injection of Gases from Non-Conventional Sources into Gas Networks ; Health and Safety Executive (2010) Guidance on hazards arising from the conveyance and use of gas from Non-Conventional Sources (NCS) ; SoCalGas (2010). Rule 30 Biomethane Gas Delivery Specifications, European workshop biomethane Svensson Biomethane Standards 2

3 National biomethane standards* (Si) bar *Sources: Marcogaz report (2006); HSE (2010) ; TC 234/WG9 (juli 2010), unpublished draft of Technical Report (TR): Gases from non-conventional sources Injection into natural gas grids Requirements and recommendations ; Proposed Decree by the (Dutch) Minister of Economic Affairs, no. WJZ/ , establishing regulations European workshop for natural biomethane gas grid composition Svensson Biomethane ( ) Standards 3

4 Most important parameters for Non-Conventional Source Gases Oxygen corrosion and fouling in cavern storages Dry pipelines allow higher levels; main source in biomethane is air for H2S removal, alternative removal methods exist Siloxanes forms SiO2 during combustion Man-made, found in WWTP and landfill; Fouling of λ-sensors and EATS; Abrasion and cloggings in engines Ammonia corrosion risk Easily removed during normal upgrading Halocarbons corrosion and health concerns Low risk probability since levels generally low, except some landfill gas European workshop biomethane Svensson Biomethane Standards 4

5 Less important parameters for Non-Conventional Source Gases Volatile metals, e.g. mercury, arsenic Low risk probability, not present in biomethane Microorganism unchartered risks: health, corrosion Risks include the probability of transfer of pathogens from manure to biogas, and MIC, Microbially Induced Corrosion; Swedish assessment indicated low health risk*, GTI study on MIC was not conclusive** Water Drying gives less risk of corrosion The corrosion impact of e.g. H2S, CO2 is water dependent Sulfur/H2S No issue for well upgraded biomethane H2S removal with excessive air addition may inflate N2 and O2 levels Main source in the grid is from odorisation and some natural gases *Vinnerås et al 2006 Identification of the microbiological community in biogas systems and evaluation of microbial risks from gas usage **GTI 2012 Guidance Document for the Introduction of Landfill-Derived Renewable Gas into Natural Gas Pipelines European workshop biomethane Svensson Biomethane Standards 5

6 Interest in biomethane CEN work EU identified lack of standards as barrier for the implementation of biomethane : CEN standards CNG and biomethane EC mandate** biomethane grid injection + vehicle fuel Formation of joint Project committee CEN/TC408 to facilitate joint work between the gas and automotive businesses 2012: CNG also included in the scope! Please note: NG specification work in CEN/TC234/WG11 has priority lane, i.e. the limit values of joint parameters are decided by them*** (TC234 Gas infrastructure) PC408 (TC019 Petroleum products) Wide spec (BAU) Gap! Tight spec (Euro6, fuel efficiency) Biomethane actors somewhere in between **M/475 08/11/2010, Mandate to CEN for standards for biomethane for use in transport and injection in natural gas pipelines ; ***M/400 16/01/2007, Mandate to CEN for standardisation in the field of gas qualities European workshop biomethane Svensson Biomethane Standards 6

7 CEN/PC408 scope of work 1. Grid injection TC234/WG11: NG grid spec. 2. Blends of NG + biomethane 3. Non-grid gas qualities European workshop biomethane Svensson Biomethane Standards 7

8 CEN Different Expert Groups (EG) EG1 Biocontent determination Commission wants test method to settle disputes and deter fraud. C14 very expensive. Ratio C1/C2, C1/C3 could be alternative. No report yet available EG 2 Natural Gas/Biomethane as automotive fuel EG3 Biomethane grid injection specification EG4 Special missions Expert Group Assessment, availability of test methods Health criteria assessment tool (Annex X, deterministic model based on actual usage and not unknown leaks) Quality control, Compliance schemes (Annex C) Collection of siloxane data European workshop biomethane Svensson Biomethane Standards 8

9 CEN: What limits are proposed? Highlighting differences, grid vs. fuel Have priority lane! TC234/WG11 PC408- grid PC408-fuel wanted Sulphur (mg/m 3 ) <20, excl. odoriz. <10, incl. odoriz. Methane No. (MWM) >65, Min 70, 80* O 2 (%) <1 (0.01, storage) - CO (%) - 0.1** - NH3, Amine - Tech. free - Chlor. compounds (mgcl/m3) - <1 - H 2 (%) - (0.1-10, no limit better) 2, cylinder safety Water dew temp. -8 C (corrosion) Lower, climate*** Siloxanes (mg Si/Nm 3 ) - <0.1-5 < Injection: Polyaromatic hydrocarbons (PAHs) and HCN awaits further discussion in the health criteria group *Euro6: Emission guarantee not only for reference fuel, but for all fuels used ** Health criteria work gave 3 %, but for public acceptance reasons the lower limit was suggested. Might give problems for thermal gasification ***-10, -20 or -30 C at 200 bars, national decision based on climate. Drivability issue (methane hydrates). European workshop biomethane Svensson Biomethane Standards 9

10 Green Gas Grids impact on standardization work Direct representation in the CEN/TC408 EBA, NGVA Europe and NGVAE affiliate SGC; NGVAE chair of EG2 Briefs from meetings collected, discussion papers published on GGG homepage; Final report on the biomethane standardisation work soon to be issued Aiding national actors with gas quality information UK: REA supplying vital info on oxygen and siloxanes to UK regulators Spain: EBA member AEBIG given vital info, relayed to regulators Italy: supplying information to regulators through Consorzio Italiano Biogas European workshop biomethane Svensson Biomethane Standards 10

11 Biomethane standards Thank you for your attention! Any questions? , European workshop biomethane Svensson Biomethane Standards 11