4MWth Oxy-CFB Test Runs 63 rd IEA FBC meeting, Ponferrada, Spain 29-30.11.2011 Mikko Varonen
Contents Metso Power and R&D Center Facilities FOXYMET -project 4 MWth CFB Pilot Boiler, Modification for Oxycombustion Oxycombustion Tests and Results - Emission Performance - Recarbonation Summary 2
Metso Power - Global business A forerunner in fluidized bed boilers to power plants for combustion of biomass, coal and other fuels A global leader in chemical recovery solutions for pulp and paper mills Main offices Production/Service centers Sales and/or engineering offices Gothenburg Tampere - Net sales EUR 600 million in 2010-1,770 employees worldwide - Sales and engineering offices around the world - Production and service centers worldwide Charlotte Curitiba 3
Metso R&D Center Tampere, Finland Committed to sustainable energy innovations
Helping energy industries with their ongoing challenges
Metso R&D Center s capabilities to respond to market and industry needs SPECIALIZATION New technology piloting e.g. pyrolysis and oxyfuel combustion Product development and piloting of customer applications CYMIC, HYBEX, RECOX and environmental systems Business decision (MIP) process RTD project management process Monitoring Task Monitoring Feasibility Concept development BR BR BR BR BR BR Monitoring Task Solution development Launch G00 G0 G1 G2 G3 G4 Preplanning Project Execution Verifica- Introduction planning tion m0 m1 m2 m3 m4 m5 RESOURCES Highly equipped facility for combustion research extensively instrumented and automated fluidized bed pilot boiler (4 MW) 2 MW pyrolysis pilot (bio-oil production) three state-of-the-art tube reactors cold models, customized test rigs headquarters for field testing and measurements Wide network of expertise highly skilled in-house energy specialists engineers, mechanics, electricians excellent contact and cooperation with the wider scientific community, including customers, subcontractors, research centers and universities 6 Metso R&D Center General Presentation 2010
7 Oxycombustion
Foxymet -project A cooperation project between Metso and Fortum Power and heat generation by oxyfuel combustion - power plant modernizations - new power plants Testing during 2010 - Metso s 4 MW pilot plant in Tampere - Two tested coals with different S-contents - 4 test weeks Oxycombustion technology can be utilized and operated succesfully in CFB boilers Solver effect Oxyfuel combustion enables power generation with no exhaust gases. 8 Metso R&D Center General Presentation 2010
Foxymet Scope of project Metso scope Aim is to gain the knowledge necessary for oxycombustion demonstration Fossil fuel and/or biomass Combustion Gas purification Fortum Scope Provide information regarding the requirements of oxycombustion at existing and new power plants. Compression Power (and Heat) CO 2 to storage O 2 Air separation unit Air 9
Oxy-CFB development 100 kw fuel CFB Pilot at VTT Batch fed FB reactor 4 MW th Oxy-CFB Pilot Comprehensive CFB process model 10
4 MW Fluidized Bed Pilot Boiler Modification Oxygen delivery system BHF FG recirculation Pressurized RG system for LS fluidization Extensive sealing work 11
4MW oxy-cfb Tests - Targets Next scale up step from the VTT oxy- CFB tests Safe handling of oxyfuel process Gain data for modeling purposes Study the effect of test parameters on - Emissions (S-capture, N- components, etc) - Deposit formation - Unburned carbon - Operability (recarbonation based problems) Process control and interlocking development for oxyfuel process 12
Test Runs Test Parameters Foxymet fuels Low-S = Russian bituminous coal High-S = American bituminous coal Low-S High-S C %(d) 71,3 75,9 H %(d) 4,9 5,1 N %(d) 2,4 1,4 S %(d) 0,49 2,4 O %(d) 9,3 7,4 H2O %(ar) 9,1 8,5 Ash %(d) 11,6 7,8 LHV MJ/kg 25,95 28,2 13
Major Results Emission Performance Test point AIR T med OF25 T med OF28 T med OF25 T high OF25 T med CaCO 3 Thermal power MW 4,2 4,7 4,6 4,5 4,7 prim O 2 vol-% wet - 25,4 27,8 24,8 24,9 sec O 2 vol-% wet - 24,2 28,4 25,3 23,9 Ca/S total mol/mol 2,2 2,2 2,3 2,6 6,0 T bed C 844 844 852 904 849 T furnace exit C 823 824 836 871 833 O 2 vol-% wet 3,5 3,3 3,5 3,5 3,2 H 2 O vol-% wet 7,8 25,8 23,8 22,6 24,6 CO 2 vol-% dry 14 73 82 81 83 SO 2 ppm dry 337 3132 1080 1642 246 SO 2 mg/mj 283 470 141 224 33 NO ppm dry 63 72 69 31 62 NO mg/mj 24 5 4 2 4 14
Major Results Recarbonation Recarbonation based circulation problems, when - Ca/S was elevated and - Tbed > 870 C Circulation material accumulates into the dipleg Decline of hbed starts when Tbed > 870 C - Decline of T eases the circulation - Everything returns to normal CaO(s)+CO2(g) CaCO3(s) 15
Test Runs Perceptions from the test weeks 16
Summary Metso has conducted a comprehensive Oxy-CFB test program 4MWth CFB Pilot boiler was modified for oxycombustion An extensive test matrix within 4 test weeks with 2 different coals was conducted in 2010 Safe and reliable operation window for Oxy-CFB combustion was defined Total emissions in mg/mj are lower in oxy, but emissions contents are remarkably higher process design and HSE issues! - In oxy-mode high temperature and oxygen concentration promote low emissions Oxy-combustion technology can be applied in CFB boilers 17
THANK YOU! 18