TEMPERATURE PHYSICAL ADSORPTION Ji tefanica, Luk Pila 4.11.2015 - - PowerPoint PPT Presentation

ÚJV Řež, a. s.

POST – COMBUSTION CO2 CAPTURE BY LOW TEMPERATURE PHYSICAL ADSORPTION

Jiří Štefanica, Lukáš Pilař 4.11.2015

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Overview

Adsorption positives Adsorption challenges Pilot plant Experiment results Integration to power plant

Adsorption positives

Working medium is in solid state – easier manipulation Lower desorption energy Does not require water Non-corrosive working medium

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Adsorption challenges

Sorbent interaction with flue gas components

Water NOX, SO2 PM

Loss of sorbent capacity Suitable adsorption material

Expectations impregnated sorbents with high capacity for CO2 (15 %) – not successful Reality activated carbon AP4-50 maximum capacity for CO2 2,5 % To reach 75 % CO2 capture efficiency the capacity for CO2 will drop to1,5 % (respectively 85 % CO2 capture with the capacity of 0,5 %)

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Pilot plant

Rotary adsorber – for testing purposes consists of 6 separate collumns Parameters

Adsorption temperature: 60 °C Desorption temperature: 300 °C (220 °C) Pressure: atmospheric Flow in adsorption part: 90 m3/h Adsorber diameter: 0,8 m (column 0,2 m) Adsorber height: 0,23 m Flow in desorption: 10 m3/h Desorption medium: Air (CO2) Rotation: 1 step in 2 – 4 min

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Pilot plant - diagram

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Pilot plant

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Pilot plant

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Experimental results

Tests with „model flue gas“ 10 – 14 % CO2 in air Tests with real flue gas on the premises of Prunéřov power plant (250 MW, lignite coal, net efficiency 38,4 %)

CO2: 5 – 8 % vol. NOx: 1 – 10 ppm SO2: 10 – 300 ppm CO: 1 – 10 ppm O2: 10 – 20 % vol.

• rel. humidity: up to 98 %

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Experimental results

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Experimental results

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Integration to power plant

Input parameters

Fuel – lignite – mine Libouš LHV 8,5 MJ/kg Water 31 % weight Ad 41 % weight Sd 3 % weight Flue gas

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Flue gas volume - dry Nm3/h 766 045 NOx mg/Nm3 207,5 CO2 % obj 13,94 PM mg/Nm3 10,4 O2 % obj 5,44 Vapor Nm3/h 218 493 N2 % obj 80,62 Water(drifting drops) kg/h 80 SO2 mg/Nm3 155,6 SO3 mg/Nm3 12,44 Temperature °C 62

Integration to power plant

Input parameters

• 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 efficiency

38.4%

• Utilization

6 300 h/year

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Gross power output MWe 250 Fuel consumption t/h 214 Heat in fuel MWt 588 Electricity self-consumption MWe 24 Production CO2 t/h 211 CO2 to atmospher t/h 211 Net electrical output MWe 226 Net efficiency % 38.4

Integration to power plant

Scheme

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Integration to power plant

Electricity consumption

ID fan (flue gas) FD fan (air) CO2 blower CO2 compression Other

Water consumption

• Flue gas cooling
• CO2 compressor cooling

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Equipment Unit Number ID fan MWe 1.89 FD fan MWe 1.10 CO2 blower MWe 0.50 CO2 compression MWe 16.99 Mechanical cooling tower MWe 0.88 Other MWe 1.14 Suma MWe 23.08 Equipment Heat MWe Cooling water t/hour Evaporation t/hour Flue gas cooling 92.2 7 927.7 105.9 CO2 compressor 19.6 1 685.9 Suma 9 613.6 105.9

Integration to power plant

First result

*Capture efficiency ca 75 %

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Parameters Unit Existing unit without CCS Existing unit with CCS Gross power output MWe 250 245 Fuel consumption t/hour 214 214 Heat in fuel MWt 588 588 Electricity self-consumption MWe 24 24 Production CO2 t/hour 211 211 Captured CO2 t/hour 158 CO2 to atmospher t/hour 211 53 CCS power consumption t/hour 23* Net electrical output MWe 226 198 Total Net efficiency % 38.4 33.73 Efficiency decrease p.p 4.77