CCS technology - oxyfuel CCS technology - oxyfuel Result of project FR-TI1/379 (2009-2013) Result of project FR-TI1/379 (2009-2013) PILAŘ Lukáš, DLOUHÝ T PILAŘ Lukáš, DLOUHÝ T omáš omáš Opening seminar of project NF-CZ08-OV-1-003-2015, 10. 4. 2015 Opening seminar of project NF-CZ08-OV-1-003-2015, 10. 4. 2015
CCS – Oxyfuel – principal Fundamentals diagram 2
Schema of facilities sequences 3
CCS – Oxyfuel Block diagrams for power plant with air and oxyfuel boiler used in modeling 4
CCS – Oxyfuel Reference liqnite power plant unit with power output 250 MWe, (Prunéřov II coal power plant) Parameters of reference power unit: • Admission steam: ta= 575°C, p = 18,3 MPa Reheated steam: tp = 580°C, p = 3.6 MPa Feedwater temperature 251°C Gross power output 250 MWe Net effjciency 38,4% • Využití inst. Výkonu 6300 h/rok 5
CCS – Oxyfuel Modifjed systems • Boiler • Fly ash separation • Flue gas desulphurisation New systems • Air separation unit • Coal dryer • Flue gas condenser • CO2 Purifjcation and Compression 6
CCS – Oxyfuel – modifikované systémy Boiler (signifjcant construction change) • generally smaller => lower exhaust gas volume, • signifjcant fmue gas recirculation, • heat exchange surface, • high requirements for tightness Fly ash separation • Lower fmue volumetric fmow and Difgerent fmue composition and temperature • Higher concentrations of SOx Flue gas desulphurisation • Wet limestone scrubbing - modifjcation => separate oxidative tank from the absorber to the external tank. • Lower fmue volumetric fmow and Difgerent fmue composition and temperature 7 • higher inlet temperature
CCS – Oxyfuel – nové systémy Air Separation Unit (ASU) – Oxygen is provided by cryogenic distillation of air at 95% purity. Major components of ASU are rectifying column and multi-stage axial compressor for inlet air. Coal Drying – First stage of coal drying takes place in a fluidized bed dryer with heat origniated from condensation of compressed waste vapours (of vapours). Flue Gas Condenser – Water vapour is condensed to be separated from the flue gas. Direct contact counter current condeser is designed to achieve rapid heat transfer. CO 2 Purification and Compression – CO 2 is compressed by multi- stage radial compressor. Final purification to required 96% CO 2 purity is obtained by two-stage flash distillation at temperature of -50°C. 8
CCS – Oxyfuel 9
CCS – Oxyfuel Boiler – air and oxyfuel boiler comparison Main parameters comparison Oxyge Parameters Unit Air n Heat output [MW] 525,9 Steam temperature [°C] 575/580 Steam pressure [MPa] 18,3/3,7 Boiler effjciency [%] 91,16 91,12 Flue gas recirculation [%] 4,8 66,5 Flue gas temperature [°C] 146 284 Fireplace size [m] 15x15 12x12 Heat exchanger - economizer [%] 100 144,1 Heat exchanger - vaporizer [%] 100 79,8 Heat exchanger superheater [%] 100 84,8 Heat exchanger - reheater [%] 100 110,5 10
CCS – Oxyfuel Air boiler Oxyfuel boiler 11
CCS – Oxyfuel – results Reference Parameter Unit Oxyfuel unit Boiler steam output t/h 660 660 Lignite LHV 9,75/13,1 MJ/kg 9,75/- – raw/after drying 2 Lignite consumption t/h 212 202 ASU output tO 2 /den - 4431 Flue gas production Nm 3 /s 229,3 61,6 Gross electrical output MWe 250 262,7 Electricity self- MWe 24 92 consumption Net effjciency % 38,4 30,4 Net effjciency drop p. b. - 8 Amount of captured % 100 154 CO2 Amount of released t/h 0 177 CO2 12 Boiler steam output t/h 211 24
CCS – Oxyfuel – requirements for built-up area Platform size Provozní soubory / objekty Height (m) (m) 15 (31 m ASU unit 60 x 60 rectifjcation column) Oxygen storage vessel – diameter 7 m 11 x 11 12 Liquid nitrogen storage unit Ø 3,5 10 Fuel treatment 65 x 65 65 Boiler 50 x 65 75 Electrostatic precipitator 18 x 24 25 Flue gas fan 8 x 4 4,5 Flue gas desulphurisation – absorber 33 x 22 diameter 9 m, height app. 35m Flue gas condenser Ø 6 CO2 Purifjcation and Compression 50 x 32 20 13
CCS – Oxyfuel – layout 14
THANKS FOR YOUR ATTENTION 15
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