Symulacja kotła K-4 w ERSA Zmodernizowany układ paleniskowy przez konsorcjum Energotechnika-Energorozruch S.A.- IPW Polin Sp. z o.o. - 5 zespołów młynowych w ruchu - praca na samym węglu - moc bloku 225MWe Modelowanie wykonane przez: Dipl.-Ing. Frank Blum, Dr.-Ing. Xiaohai Han, Dr.-Ing. Benedetto Risio RECOM Services GmbH, Stuttgart

10 Nozzles of Thinned Air-Coal Mix in Operation 3D-Geometry Model — Burner and OFA Arrangement OFA-III on Rear Wall - fully opened (tilted down 20°) Front View 5 Mills in Operation OFA-II - fully opened (tilted down 15°) 10 Nozzles of Thinned Air-Coal Mix in Operation Thinned Air-Coal Mix (tilted down 15°) Biomass/Oil Nozzle (tilted down 15°) OFA-I (no tilting – fully opened) 10 Burners in Operation Burner Level 2 Burner Level 1

28.5 (rear & side walls); 5.1 (Front wall) ( = 0.165) Coal and Air Mass Flows Brn Level 1 (12.6 m) Brn Level 2 (15.1 m) Thinned Mix (20.85 m) Total Coal mass flow [kg/s] 4 × 1.89 = 7.56 6 × 1.89 = 11.34 10 × 0.81 = 8.1 27.0 Core air [kg/s] 0.8 1,2 -- 2.0 Primary air [kg/s] 4 × 3.35 = 13.4 6 × 3.35 = 20.1 10 × 3.35 = 33.5 67.0 Secondary air [kg/s] 7.5 10.3 4.8 22.6 Tertiary air [kg/s] 17.6 16.8 34.4 Level Air/Coal Ratio  0.690 0.566 0.626 0.618 OFA-I [kg/s] 11.4 ( = 0.056) 11.4 OFA-II [kg/s] 34.2 ( = 0.168) 34.2 OFA-III [kg/s] 24.8 ( = 0.122) 24.8 Protective air [kg/s] 28.5 (rear & side walls); 5.1 (Front wall) ( = 0.165) 33.6 Bottom air [kg/s] 4.8 ( = 0.024) Total Air [kg/s] 234.8 ( = 1.15)

Coal Analysis and Particle Size Distribution Main Burner (12.6m & 15.1 m) Coal Analysis C (ar) [%] 56.40 H (ar) [%] 3.57 O (ar) [%] 3.92 N (ar) [%] 0.98 S (ar) [%] 0.63 Ash (ar) [%] 27.10 Moisture (ar) [%] 7.40 Volatile (daf) [%] 27.5 Hu (daf) [MJ/kg] 33.5 R88 = 30 % R200 = 5 %

Thinned Air-Coal Mix (20.85 m) Coal Analysis and Particle Size Distribution Thinned Air-Coal Mix (20.85 m) Coal Analysis C (ar) [%] 56.40 H (ar) [%] 3.57 O (ar) [%] 3.92 N (ar) [%] 0.98 S (ar) [%] 0.63 Ash (ar) [%] 27.10 Moisture (ar) [%] 7.40 Volatile (daf) [%] 27.5 Hu (daf) [MJ/kg] 33.5 R88 = 15 % R200 = 1 %

Velocity Distribution: Magnitude [m/s] FW RW

Velocity Distribution: Magnitude [m/s] FW RW FW RW

Temperature Distribution [°C] FW RW

Temperature Distribution [°C] FW RW FW RW

Fluegas Temperature Profile along Furnace Height OFA1 OFA3 BL1 BL2 BL4 OFA2 FE Cross Pass Sec. Pass ° 35/45 40 35 30 25 20

Oxygen Distribution Oxygen [vol.-%, dry] FW RW

Oxygen Distribution Oxygen [vol.-%, dry] FW RW FW RW

Carbon Monoxide Distribution CO [vol.-%, dry] FW RW

Carbon Monoxide Distribution CO [vol.-%, dry] FW RW FW RW

CO-Profile along Furnace Height OFA1 OFA3 BL1 BL2 BL4 OFA2 FE Cross Pass Sec. Pass 35/45 40 35 30 25 20

NOx-Profile along Furnace Height OFA1 OFA3 BL1 BL2 BL4 OFA2 FE Cross Pass Sec. Pass 35/45 40 35 30 25 20

Simulation for Polin-Concept with Protective Air Boiler Exit and Emission Values Simulation for Polin-Concept with Protective Air Furnace Exit Temp. (mean/max) [°C] (Level 34.7 m) 1245/1360 Fluegas Temp. after ECO [°C] 344 O2 after ECO [Vol.-%,dry] 3.2 CO [mg/Nm3, at 6% O2 ] 46 NOx [mg/Nm3, at 6% O2] 326 Unburned Carbon in Ash 5.6