Energy Efficiency in Statoil

Transcription

1 Energy Efficiency in Statoil Energirike, Kårstø - 22 nd of June 2012

2 Outline Why focus on energy efficiency CO 2 tax in Norway Industry leader in CO 2 Alternatives for improved efficiency Energy Management FOT PT Energy systems Summary 2

3 Why focus on energy efficiency? Global climate focus The climate quota regime will prevail and develop further Energy friendly solutions and production might give competitive advantages Missing energy focus documentation might reduce corporate credibility (ref EU s fuel directive) White paper on climate policy April 2012 Increased CO2 tax for petroleum industry by 200 NOK Increased focus on energy efficiency CCS (Carbon Capture and Storage) on all new onshore gas fired power plants Statoil has a corporate ambition to be Industry leader on carbon efficiency Corporate proposed energy efficiency targets FR10, TR 1011 and TR 1009 on Energy management and Emissions to air 3

4 CO 2 tax in Norway Norwegian CO 2 tax from 1 st of January 1991 a tax for the Norwegian continental shelf CO 2 tax is paid for each standard cubic meter of gas burned or cold ventilated and per litre petroleum burned. Reference: Klimakur 2020 CO 2 factor of 2,34 KgCO 2 /Sm 3 combusted 4

5 Industry leader in CO 2 Some limited external data (CDP & OGP) indicates that Statoil is among the industry leaders in CO 2 intensity 23 kgco2/boe 9 kgco2/boe CDP Carbon Disclosure Project OGP - International Association of Oil & Gas producers 5

6 Alternatives for improved efficiency LOW ENERGY PROCESSING Pressure conservation in process design High pressure inlet separator -> avoid recompression Expanders for power production in large pressure let down services Heat integration and utilization of exhaust heat Pinch analysis Excess exhaust heat utilization for eg. for oil/gas separation Efficient and flexible compressor systems Compression is by far the most energy demanding unit Avoid unnecessary recirculation around compressors Speed Control on each compression process stage Cooling before compression and/or inter cooling On-line gas turbine wash Improved efficiency and reduced maintenance time 6

7 Simple cycle/chp vs. CCGT POWER GENERATION Simple cycle / CHP Gas turbines are operated in simple cycle with electrical efficiency typically around 35% Typically aero derivative gas turbines Some heat recovery for process heat generation in a Waste Heat Recovery Unit CHP (Combined Heat and Power) CCGT - Combined Cycle Highly efficient Electrical efficiency of fuel fired 45-50% offshore 58-60% onshore Pending low heat duty Thermal efficiency strongly dependent on heat demand 7

8 Alternatives for improved efficiency SYSTEM DESIGN POWER GENERATION AND BOTTOM CYCLES Careful design considering the following main parameters: Plant concept design Process demand Efficiency Redundancy and sparing philosophy Steam Rankine cycles heat recovery from GT exhaust is a steam Rankine cycle occupy large areas due to low condenser pressure (typical 0,1 bara) require massive turbine wheels Organic Rankine cycles (ORCs) intermediate loop between exhaust and working fluid lower efficiency than steam cycles small and simple due to condenser above atmospheric pressure ORC working fluids tend to be flammable DReSCO cycle (CO 2 ) no intermediate fluid required Increased efficiency 20% higher than ORC equal to 2P steam high operating pressure leads to compact equipment technology is not commercialised 8

9 Energy Management Requirement in the discharge permits Establish a system based on ISO Central coordination ensures a uniform system across all facilities in MPR Each facility are responsible for the local implementation Recommendations and decisions are linked to the yearly plans of each facility Enova can provide investment support for energy efficiency projects 9

10 FOT PT Energy systems Experience Power plants Steam systems Energy Efficiency and optimization Emission reduction technologies Power cycle simulations CombiCap G4F Cycle JV GE/Statoil Business development CO 2 post-combustion capture technology What do we do Promotes efficient solutions and alternatives Focus on efficiency Cooperate in JV s Increasing focus towards offshore energy systems 10

11 Summary Technical alternatives are in place, however Often costly solutions Low pay back incentives Governing documents are robust and demanding but Business Cases are challenging Further work Systematically use Energy management as tool for improved efficiency and catch the easy ones Challenge and systemise work related to increased energy efficiency in the organisation Participate in JV s with the aim of developing more cost efficient solutions 11

12 Presentation title Svein Nordhasli Head of Energy Systems Tel: