Maximising the available fuel portfolio improved affordability

Transcription

1 Maximising the available fuel portfolio improved affordability Ari Kokko Director, Technology and R&D Valmet

2 Maximising the available fuel portfolio improved affordability Content 1 Valmet s offering in energy CFB s fuel flexibility Cost of renewable fuels Fuel research in Valmet New fuels tested Summary 2

3 Valmet s offering in energy HYBEX (BFB technology) BtE and WtE CYMIC (CFB technology) BtE, WtE and multifuel Gasification BtE and WtE Power plant, co-gasification and lime kiln Rebuilds and conversions Air pollution control Automation 3

4 CFB s biggest benefit: Fuel flexibility CYMIC Trade name for Valmet CFB boilers Size range MW e Fuel flexibility From high heating value and high ash fuels to high moisture fuels High steam data capability with corrosive fuels Good in-furnace sulphur removal 4

5 Valmet fuel experience in CYMIC boiler Valmet has full scale experience of following range of fuel properties: calorific value from biomass 6.5 MJ/kg to pet coke 32 MJ/kg moisture content up to 60% in biomass ash content up to 65% in waste coal sulfur content up to 6 8% in pet coke Wood Recycled wood RDF Agro Sludge Coal Peat Lignite Pet coke Waste coal 5

6 Price of renewable fuels tends to increase Turning from fossil fuel towards renewable fuels often creates fuel availability problems and fuel prices are going up New less expensive fuels are continuously coming onto market New fuels are always technically more challenging Biomass price trend in Sweden SEK/MWh Wood pellets Wood chips Wood waste Peat Recycled wood Year 6

7 Valmet has extensive experience with demanding fuels Based on over 300 fluidized bed references and own R&D center Fuel testing since 1990: 4 MW th CFB kw tube reactors Cold models Over 9,000 fuel analysis in fuel library 7

8 Energy technology R&D Center Pilot equipment designed, build and easily modified to develop different technologies Tube reactor Pilot Full Scale Both internal R&D and customer projects New technology piloting Improving the competitiveness of current technology Testing new fuels and fuel mixtures Development of research and measurement methods Co-operation with scientific community 8

9 Valmet R&D Center milestones 1982 First BFB 1984 First CFB May 1990 First test-runs June 1990 R&D Center inaugurated 1990 s Fuel testing 2000 s Multifuel capability Emission reduction and corrosion knowledge Boiler component development 2010 s Agro-Coal-Waste testing Cyclone development Marine scrubber Loop seal superheater development Pyrolysis process development ESP and BHF development 2012 First gasification plant 2017 Asian agro fuels testing with customer Asphaltene testing with customer 2013 First Pyrolysis plant 9

10 Ofunato Power Inc project new fuels JFE Engineering and Valmet supplying power plant to Ofunato Power Inc 75 MW e reheat CFB (65/57 kg/s, 142/27 bar, 557/540 C) Fuels: PKS (60%), EFB pellets (30%) and coal (10%) Long term target: to have 100% EFB pellets Need for fuel testing: EFB as a new fuel Oil palms Fruit bunch PKS Coal Empty fruit bunces (EFB) Palm kernel shells (PKS) EFB pellets 10

11 EFB testing in Valmet R&D Center pilot boiler High alkali and chlorine content in the fuel increases the risk of bed agglomeration and high temperature corrosion due to alkali-chloride deposits JFE Engineering, Taiheiyo Cement and Valmet decided to conduct a full pilot test with EFB Safe limit for Na+K = 2, ,000 mg/kg in a fuel mixture unprocessed EFB is ten times higher Wood chips PKS EFB Processed EFB Coal Moisture % LHV MJ/kg S % DS Cl % DS Ash % DS Na mg/kg DS K mg/kg DS 850 2,150 20,300 1,

12 EFB testing in Valmet R&D Center pilot boiler Plant owner wanted to test processed EBF Test run of one working week (100 hours non-stop) Share of EFB was increased gradually to 100% Fouling tendency was measured with deposit probe Bed temperature was kept at normal level ( C) Test point #2 is the operation point of the boiler Test point #5 is the long term target of boiler operation point Fuel share, % of energy Test point Coal PKS Processed EFB TP Bed material sample TP3 TP5 Results Alkali level in the bed remained stable no agglomeration Deposit probe test indicated no increased risk for alkali-chloride induced corrosion Controllable deposit probe 12

13 EFB testing story continues Pilot test run confirmed that Ofunato design fuel mixture can be operated safely (30% EFB with 60% PKS and 10% coal) Test showed that a 100% share with processed EFB might be possible It was agreed that tests will continue when the boiler is in operation in 2019 Positive results were achieved without lowering bed temperature or having any additives However to manage the corrosion risk it is necessary to have a finishing superheater and reheater inside the bed material in a cyclone loop seal Main steam temperature 557 C and 540 C for reheated steam 13

14 Summary Increased demand for renewable fuels leads to higher fuel prices Power plant owners are seeking less expensive fuel alternatives and these fuels are always technically demanding New fuels can be tested at Valmet R&D Center before full-scale use EFB pellets were tested in co-operation with customer Test showed that agro-based biomass can be fired safely in a CFB boiler Preprocessing agro fuels greatly reduces the operation risk Preprocessing agro biomass may be more common in the future since wood-based biomass is not available everywhere 14

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