symulacja kotła k-4 w ersa zmodernizowany układ paleniskowy przez konsorcjum...
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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 węglu i biomasie
- biomasa (śruta rzepakowa) podawana przez 4 środkowe dysze zrzutowe – uwaga: śruta podawana w stanie niezmielonym,
prędkość wtrysku nieoptymalizowana- moc bloku 225MWe
Modelowanie wykonane przez:
Dipl.-Ing. Frank Blum, Dr.-Ing. Xiaohai Han,
Dr.-Ing. Benedetto Risio
RECOM Services GmbH, Stuttgart
Simulation of RYBNIK-Boiler 2
3D-Geometry Model — Burner and OFA Arrangement
Front View
OFA-II - fully opened(tilted down 15°)
OFA-I(no tilting – fully opened)
Thinned Air-Coal Mix (tilted down 15°)
Biomass/Oil Nozzle(tilted down 15°)
Burner Level 2
Burner Level 1
OFA-III on Rear Wall- fully opened(tilted down 20°)5 Mills in Operation
10 Burners in Operation
10 Nozzles of Thinned Air-Coal Mix in Operation
4 Biomass nozzles in Operation 10 % thermal capacity as biomass
Simulation of RYBNIK-Boiler 3
Coal and Air Mass Flows
Brn Level 1
(12.6 m)Brn Level 2
(15.1 m)Thinned Mix
(20.85 m)Biomass
LevelTotal
Coal mass flow [kg/s] 6.8 10.2 7.3 3.37 (biomass) 27.67
Core air [kg/s] 1.30 1.30 -- -- 2.6
Primary air [kg/s] 13.2 19.7 30.8 (2x15.4)3.3
(carrying air)67.0
Secondary air [kg/s] 9.8 15.2 5.7 (cooling air) -- 30.7
Tertiary air [kg/s] 22.8 24.9 -- -- 47.7
Level Air/Coal Ratio 0.91 0.78 0.53 0.735
OFA-I [kg/s] 13.5 ( = 0.065) 13.5
OFA-II [kg/s] 45.1 ( = 0.22) 45.1
OFA-III [kg/s] 26.9 ( = 0.13) 26.9
Total Air Ratio 1.15
Simulation of RYBNIK-Boiler 4
0
20
40
60
80
100
0 50 100 150 200 250 300 350
Particle Size [m]
Fra
ctio
n [
wt.
%]
Rosin-Rammler Verteilung
8-Klassen fuer Simulation
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
Coal Analysis and Particle Size Distribution
R88 = 30 %
R200 = 5 %
Main Burner (12.6m & 15.1 m)
Simulation of RYBNIK-Boiler 5
0
20
40
60
80
100
0 50 100 150 200 250 300 350
Particle Size [m]
Fra
ctio
n [
wt.
%]
Rosin-Rammler Verteilung
8-Klassen fuer Simulation
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
Coal Analysis and Particle Size Distribution
R88 = 15 %
R200 = 1 %
Thinned Air-Coal Mix (20.85 m)
Simulation of RYBNIK-Boiler 6
Coal Analysis
C (ar) [%] 43.60
H (ar) [%] 6.34
O (ar) [%] 31.19
N (ar) [%] 5.73
S (ar) [%] 0.68
Ash (ar) [%] 7.21
Moisture (ar) [%]
5.25
Volatile (daf) [%] 80.0
Hu (daf) [MJ/kg] 20.13
Elementary Analysis and Particle Size Distribution of Biomass
Sieve[mm]
Fraction[%]
Sieve residue[%]
> 4.00 12.1 12.1
4.00 – 3.15 2.6 14.7
3.15 – 1.25 20.0 34.7
1.25 – 0.425 41.2 75.9
0.425 – 0.125 22.5 98.4
0.125 – 0.071 1.6 100.0
Simulation of RYBNIK-Boiler 7
Velocity
[m/s]
Velocity Distribution: Magnitude
FW
RW
FW
RW
Simulation of RYBNIK-Boiler 8
Temperature
[°C]
Temperature Distribution: Iso-surface 1400 °C
Simulation of RYBNIK-Boiler 9
200
400
600
800
1000
1200
1400
1600
1800
2000
5 10 15 20 25 30 35 40 45 50 55 60
Furnace Height [m]
Tem
per
atu
re [
C]
Average
Maximum°
Fluegas Temperature Profile along Furnace Height
Sec. Pass
35/45 40 35 30 25 20
Cross Pass
OFA1 OFA3
BL1 BL2 BL4 OFA2 FE
Simulation of RYBNIK-Boiler 10
Oxygen Distribution: Iso-surface 10%
Oxygen
[vol.-%, dry]
Simulation of RYBNIK-Boiler 11
CO
[vol.-%, dry]
Carbon Monoxide Distribution: Iso-surface 1%
Simulation of RYBNIK-Boiler 12
0
5000
10000
15000
20000
25000
30000
5 10 15 20 25 30 35 40 45 50 55 60
Furnace Height [m]
CO
[m
g/N
m3]
CO-Profile along Furnace Height
Sec. Pass
35/45 40 35 30 25 20
Cross Pass
OFA1 OFA3
BL1 BL2 BL4 OFA2 FE
Simulation of RYBNIK-Boiler 13
0
200
400
600
800
1000
1200
5 10 15 20 25 30 35 40 45 50 55 60
Furnace Height [m]
NO
x [m
g/N
m3]
NOx-Profile along Furnace Height
OFA1 OFA3
BL1 BL2 BL4 OFA2 FE
Sec. Pass
35/45 40 35 30 25 20
Cross Pass
Simulation of RYBNIK-Boiler 14
Boiler Exit and Emission Values
Simulation for Biomass Cofiring
Furnace Exit Temp. (mean/max) [°C]
(Level 34.7 m)1223/1350
Fluegas Temp. after ECO [°C] 342
O2 after ECO [Vol.-%,dry] 3.3
CO [mg/Nm3, at 6% O2 ] 60
NOx [mg/Nm3, at 6% O2] 328
Unburned Carbon in Ash 8.0
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