CCS technology - oxyfuel CCS technology - oxyfuel Result of project - - PowerPoint PPT Presentation

CCS technology - oxyfuel

Result of project FR-TI1/379 (2009-2013)

CCS technology - oxyfuel

Result of project FR-TI1/379 (2009-2013)

PILAŘ Lukáš, DLOUHÝ T

• máš

PILAŘ Lukáš, DLOUHÝ T

• máš

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

Fundamentals diagram

CCS – Oxyfuel – principal

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Schema of facilities sequences

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Block diagrams for power plant with air and oxyfuel boiler used in modeling

CCS – Oxyfuel

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Reference liqnite power plant unit with power

• utput 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

CCS – Oxyfuel

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Modifjed systems

• Boiler
• Fly ash separation
• Flue gas desulphurisation

New systems

• Air separation unit
• Coal dryer
• Flue gas condenser
• CO2 Purifjcation and Compression

CCS – Oxyfuel

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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

• higher inlet temperature

CCS – Oxyfuel – modifikované systémy

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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. CO2 Purification and Compression – CO2 is compressed by multi- stage radial compressor. Final purification to required 96% CO2 purity is

• btained by two-stage flash distillation at temperature of -50°C.

CCS – Oxyfuel – nové systémy

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CCS – Oxyfuel

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Boiler – air and oxyfuel boiler comparison

Main parameters comparison Parameters Unit Air Oxyge 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

CCS – Oxyfuel

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CCS – Oxyfuel

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Air boiler

Oxyfuel boiler

Parameter Unit Reference unit Oxyfuel Boiler steam output t/h 660 660 Lignite LHV – raw/after drying MJ/kg 9,75/- 9,75/13,1 2 Lignite consumption t/h 212 202 ASU output tO2/den

• 4431

Flue gas production Nm3/s 229,3 61,6 Gross electrical output MWe 250 262,7 Electricity self- consumption MWe 24 92 Net effjciency % 38,4 30,4 Net effjciency drop

• p. b.
• 8

Amount of captured CO2 % 100 154 Amount of released CO2 t/h 177 Boiler steam output t/h 211 24

CCS – Oxyfuel – results

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Provozní soubory / objekty Platform size (m) Height (m) ASU unit 60 x 60 15 (31 m 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 diameter 9 m, height app. 35m 33 x 22 Flue gas condenser Ø 6 CO2 Purifjcation and Compression 50 x 32 20

CCS – Oxyfuel – requirements for built-up area

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CCS – Oxyfuel – layout

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THANKS FOR YOUR ATTENTION

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