Change of gas quality: a case study from Denmark. Lindgren, Tine Energinet.dk

Transcription

1 Change of gas quality: a case study from Denmark Lindgren, Tine Energinet.dk

2 Content Facts about Energinet.dk Why do we have a Danish case? Preparations for new gas imports Experiences gained Tine Lindgren 2

3 Facts about Energinet.dk Independent public enterprise under the Danish Ministry of Climate, Energy and Building Owns and operates the energy motorways The main electricity and natural gas systems The regional power transmission grids Owns and operates Lille Torup natural gas storage facility Co-owner of the electrical interconnections to Norway, Sweden and Germany Co-owns Nord Pool Spot, Nord Pool Gas and the European Market Coupling Company Approx. 600 employees Annual revenue: DKK 7,3 billion (2011) The consumers contribute to our activities through tariffs charged to their electricity and gas bills Our finances are based on a break-even principle

4 The Danish Gas Transmission grid 800 km of pipeline 2 gas storages Entry from Danish North Sea for 25 years with very stable gas quality Domestic consumption approx. 3,5 BCM Exit points to Sweden and Germany 4 Tit el

5 Why do we have a Danish case? Tine Lindgren 5

6 Expected production from North Sea and Danish and Swedish consumption

7 Expansion of the Danish Gas Transmission System North Sea W: Sweden Since 2010 new import point at Danish/German border Increased import capacity from October 2013 W: Germany 7 Tit el

8 Wobbe index variations Wobbe indeks (MJ/m3) Danish gas Gasreglement From 2010 EASEEGas spec. DVGW G Units: 0 oc/25oc Tine Lindgren 8

9 Preparation for new gas imports Tine Lindgren 9

10 Which way to go? Adjust import gas to Danish gas quality OR Adjust gas appliances to handle variations Intensive work in to find the best solution for Denmark Premise conditions: > No increased safety risk for gas consumers > Socioeconomical efficient solution Tine Lindgren 10

11 Conclusions of the work Acceptance of a broader wobbe index range is a safe and socioeconomical efficient solution > Adjustment point should change to G20 > Some appliances should be adjusted > Environmental benefits in reduction of NOx and CO2 and marginal loss of efficiencies > Flexible for introduction of biogas > Flexible for new connections to the Danish grid 11 Tit el

12 Experiences gained Tine Lindgren 12

13 Tit el First gas quality variations appears almost instantly Øvre brændværdi målt i Ellund, Egtved og Dragør Gross calorific value in Ellund, Egtved and Dragør 14 Øvre brændværdi (kwh/nm3) okt okt okt okt okt okt okt okt okt okt okt Ellund Dragør Egtved

14 Import of gas from Germany Immediate reactions Efficiency experienced as low because lower calorific value leads to a higher consumption in cubic meters Few CHP plants have reported performance problems Few locations experienced low flow problems Noise from gas-burning equipment Concern from customers that invoicing may not be correct Tine Lindgren 14

15 Tit el Actions taken New methods for field adjustment New methods for chimney control A label for traceability that a boiler has been adjusted according to new methods All gas technicians/plumbers to be trained in the new methods Test stands for calibration of the technicians measurement equipment has been established Force draught burners are been systematically readjusted within a 3 year cycle

16 Tit el Increased information exchange regarding gas quality at 60 minute rolling average updated every 3 minute Tables with 168 hourly values on every transition point updated hourly Please note that all data are non validated data! Information meetings held

17 2 years after - Domestic appliances Noise from gas burning appliances solved by readjustment procedures Training of all gas technicians in Denmark finalized A task force has been established to perform a measurement campaign when low wobbe index gas arrives maybe never Tine Lindgren 17

18 2 years after - Heat and power plants Change of efficiency is marginal for both turbines and motors and less than the uncertainly of measurements Changed control systems of motors will be implemented and was expected necessary Intelligent control of motors will harvest the benefit of gas with a higher methane number Gas turbines been able to handle the experienced variations Use of public gas quality data for operations Tit el

19 Summary New import point to secure gas to Danish marked Socioeconomically best solution in Denmark to accept changes in gas quality Specially southern part of Denmark has been highly challenged by large variations in gas quality Readjustment of appliances to G20 during service or when repaired Installations adapted to cope with quality variations Use of public gas quality data to support operations No increase in safety related incidents Tine Lindgren 19

20 Thank you for your attention! QUESTIONS? Tine Lindgren 20