Techno-Economic Assessment of Oxy-Combustion Turbine Power Plants with CO 2 Capture
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1 Techno-Economic Assessment of Oxy-Combustion Turbine Power Plants with CO 2 Capture John Davison IEA Greenhouse Gas R&D Programme, Cheltenham, UK Paper by Luca Mancuso, Noemi Ferrari Amec FosterWheeler, Milan, Italy Paolo Chiesa, Emanuele Martelli, Matteo Romano Politecnico di Milano, Italy John Davison IEAGHG, Cheltenham, UK 5 th Oxy-combustion Network Meeting Wuhan, China, 27 th -30 th October 2015
2 Outline of Presentation Background and scope of the study Cycle descriptions Cycle performance Costs Conclusion
3 Background to the Study Oxy-combustion turbines are not a new concept Increasing interest in oxy-combustion turbines Competitive efficiencies and costs are claimed for some cycles An independent techno-economic assessment is needed IEAGHG commissioned Amec Foster Wheeler and Politecnico di Milano to carry out a study IEAGHG report 2015/5, August 2015 Available within IEAGHG s member countries
4 Study uses the assumptions in IEAGHG s recent CCS plants studies Study Scope Review literature on oxy-combustion power generation cycles and their development status Assess performance of selected natural gas-fired plants Detailed modelling of the gas turbine Flowsheet modelling of the overall cycle Estimate capital and operating costs Sensitivity to technical and economic parameters and potential for future improvements Assess a coal gasification oxy-turbine power plant
5 Cycles Selected for Detailed Assessment Selection criteria Expected efficiency State of development/technical challenges Cycles using recycled CO 2 Semi-Closed Oxy-Combustion Combined Cycle (SCOC-CC) NET Power Allam Cycle Cycles using mainly H 2 O S-Graz (2 versions) CES (3 versions)
6 Practical Activities CES has carried out Multi-MW component tests CES 170MW th gas generator CES OFT-900 turbine NET Power combustor tests 50MW th integrated plant scheduled to start commissioning in late 2016 Partnership with Toshiba, Exelon and Shaw Group
7 Conventional Combined Cycle Gas turbine Fuel Compressor Combustor 17 bar 1430C Turbine Steam turbine Cooling air Air HRSG 630C Condenser Fuel Air/oxygen Hot combustion gas Cool combustion gas / CO 2 Pure steam/water 1 bar Flue gas Pump Simplified flowsheet
8 Semi-Closed Oxy-Combustion Combined Cycle (SCOC-CC) Simplified flowsheet Oxygen Combustor Fuel 45 bar Steam turbine CO 2 1 bar 620 C CO 2 to storage HRSG Condenser Cooler Compressor Water
9 NET Power - Allam Cycle Simplified flowsheet Fuel Combustor 300 bar 1150C Oxygen CO 2 O 2 + CO 2 <400C Turbine 34 bar 740C 720C Heat input from ASU air compressor Heat exchanger CO 2 Condenser Water Compressor Cooler
10 Modified S-Graz Cycle Simplified flowsheet Oxygen Turbine Fuel Combustor 40 bar 1423C 1 bar LP Steam turbine Condenser 90% steam 10% CO 2 Steam 170 bar 555C HRSG Steam turbine CO 2 Compressor Water Compressor
11 Supercritical CES Cycle Simplified flowsheet Oxygen Fuel Steam MP Combustor LP Combustor 7.6 bar HP Combustor 59 bar LP turbine 300 bar 1150C HP turbine MP turbine 0.2 bar Steam CO 2 Water
12 Thermal Efficiencies 9C ambient temperature, Natural draught cooling towers
13 Capital Costs Total Plant Cost, excluding owner s costs and interest during construction, 2Q 2014, Netherlands location
14 Cost of Electricity 2Q 2014 costs, constant money values Netherlands location Gas cost 8/GJ (LHV), 90% capacity factor, 8% discount rate, 25 year life, 10/t CO 2 transport and storage cost
15 Sensitivity of LCOE to Novel Equipment Costs
16 Future Improvements COT - Combustor outlet temperature: NET Power C base case, 1100/1200C low/high cases SCOC C base case, 1453/1613C low/high cases Turbine blade metal temperature: 860C base case, 950C high case
17 Sensitivity to CO 2 Capture Percentage and Purity CO 2 Capture % CO 2 Purity % Efficiency % TPC /kw LCOE /MWh CAC /t Base case Membrane separation No purification Total Plant Cost, excluding owner s costs and interest during construction 2Q 2014 costs, constant money values Netherlands location Gas cost 8/GJ (LHV), 90% capacity factor, 8% discount rate, 25 year life, 10/t CO 2 transport and storage cost Lower abatement cost at higher percent capture
18 Other Sensitivities High CO 2 natural gas (70%) Quantity of CO 2 captured over 3 times higher Natural gas with high N 2 content (14%) Oxygen purity Higher ambient temperature (25C) Alternative cooling system (mechanical draught tower)
19 Economic Sensitivities
20 Gasification SCOC-CC Plant LP steam Water quench / coolers Acid Gas Removal Sulphur recovery HP steam Radiant boiler SCOC-CC cycle Coal Gasifier (GE) Steam turbine ASU Oxygen CO 2 Water
21 Coal Gasification + Oxyturbines SC-PC no capture SC-PC post combustio n capture IGCC pre combustio n capture Gasificatio n + SCOC- CC Efficiency, % LHV TPC, /kwe LCOE, /MWh CAC, /t Total Plant Cost, excluding owner s costs and interest during construction Bituminous coal: 2.5 /GJ (LHV), Discount rate: 8%, 25 year plant life, Constant, CO 2 transport and storage: 10/t, Capacity factor: 90% SCPC, 85% IGCC and SCOC SCOC-CC costs are not competitive for coal
22 Need for Further Work Continue component and cycle development Operation of integrated large pilot plants Achieve target efficiency Achieve reliable operation Demonstrate operating flexibility Cost reductions through optimisation, learning-bydoing and technology development Commercial roll-out to meet timescales for emission reduction
23 Conclusions Oxy-combustion turbines with CCS have the potential to achieve competitive efficiencies Up to 55% Higher than NGCC with post combustion capture (52%) Broadly similar capital cost, LCOE and cost of CO 2 avoidance to post combustion capture Other advantages Potential for near 100% capture Low water use Small area Need for demonstration in integrated plants
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