biomass combustion manoj
TRANSCRIPT
-
7/31/2019 Biomass Combustion Manoj
1/16
COMBUSTION TABLE FOR SOLID AND LIQUID FUELS
Molar weight Analysis Oxygen
Cont g/mol g/kg mol/kg mol/kg
C 12.01 336.00 27.98 27.98
H2
2.02 45.50 22.52 11.26
O2 32.00 301.00 9.41 -9.41
N2 28.01 3.50 0.12
S 32.06 1.29 0.04 0.04
Ash ---- 12.71
Water 18.02 300.00 16.65
Sum: 1000.00 Sum O2: 29.87
Nitrogen in air 3.77 * O2 112.621161
Sum dry air 142.49 lot
Humid ratio in air:
Total theoretical air need lo 142.49
Theoretical gas amount go 179.94
Theoretical dry gas got 140.76
CO2dry= O2dry= 29.873
CO2odry m= 1.600
O2wet= m=
Nitrogen due to air in excess
Oxygen due to air in excess
Water in air excess
Total air need 227.99 l
Total dry air 227.99 lt
Total gas 265.43 g
Total dry gas 226.26 gt
ppm
mg/Nm^3 (0 C 1 atm)
mg/m^3 (Tfg C 1 atm)
Mass of gases (Real gas) kg/kg fuel
Mass of gases (Dry gas)
Conclusion (m3n means normal cubic meter at 0C and 1,013 ba
mol/kg m3n/kg
Theoretic dry air lot 142.49 3.19
Theoretical air lo 142.49 3.19
Real dry air lt 227.99 5.11
Real total air l 227.99 5.11
Calc of air excess factor gives m = 1.250
To get m3n/kg, multiply by molar volume 0.0224 m3n/mol
Fraction in real gas:
Fraction in dry gas:
-
7/31/2019 Biomass Combustion Manoj
2/16
Method 1Fuel flow
Air to Fuel ratio with the given excess air
Flue gas flow at the given fuel burning rate
Density of flue gas at 0 C 1 atm
Flue gas flow at 0 C 1 atm
Density of flue gas at 96 C 1 atm
Flue gas flow at 96 C 1 atm
1 Actual flue gas flow
SO2 composition
SO2 flow rate
Method 2
Fuel flowAir to Fuel ratio with the given excess air
Flue gas flow at the given fuel burning rate
1 Actual flue gas flow
Ratio of SO2 mass/Flue gas mass
SO2 flow rate
Remarks
Method 2 is more accurate because it has no assu
FUEL CONSUMPTION AT MAXIMUM STEAM GENERATION
Boiler maximum steam generation at 8 barg & at 100 deg FW
Boiler thermal efficiency
GCV of fuel at dry condition
GCV of fuel at 33% moisture content
Maximum fuel consumption
Steam to fuel ratio at 8 barg & at 100 deg C
Flue gas volumetric flow at maximum steam generation
(Note: This flue gas flow is assumed to be without Ash as after scrubber is
Duct size
Equivalent diameter
Flue gas velocity
Reynolds number calculation
Flue gas temperature
Velocity
Equivalent diameter
-
7/31/2019 Biomass Combustion Manoj
3/16
Re = VelocityxDiameter/Kinematic Vi
Kinematic viscosity of flue gas at this temperature
Reynolds number through duct
Conclusion: Flow is highly turbulent
Reynolds number through chimney
Chimney diameter
Velocity through chimney
Kinematic viscosity of flue gas temperature (assumed 10 deg C temperatur
Considered temperature
Kinematic viscosity
Reynolds number through chimney
Conclusion: Flow is highly turbulent
-
7/31/2019 Biomass Combustion Manoj
4/16
FUEL : FIRE WOOD + SAW DUST
Fuel:
Flue gases (mol/kg)
H2O CO2 N2 SO2 O2 Ar
27.98
22.52
0.12
Adjusted for measured SO2 0.040
Adjusted for sum 1000
16.65
39.17 27.98 0.12 0.04 0.00 0.00
112.621
39.17 27.98 112.75 0.040 0.00
67.57
17.92
0.00
39.17 27.98 180.32 0.040 17.92
1230.97
(CO2 mass per kg of Fuel)
0.148 0.105 0.679 0.0002 0.068
0.124 0.797 0.0002 0.079
178
(NERD report value) 508
376
7.56 0.705 1.231 5.049 0.00257 0.574
r)
mol/kg m3n/kg fuel
Theoretic dry gas got 140.76 3.15
Theoretical gas go 179.94 4.03
Real dry gas gt 226.26 5.07
Real total gas g 265.43 5.95
-
7/31/2019 Biomass Combustion Manoj
5/16
1,583 kg/hr (Avg: 290 kg/hr fuel consumption at 30% MC (wet))
6.57 kg air/kg fuel
11,993 kg/hr
3.331 kg/s
1.272 kg/m 3
2.619709487 Nm 3/s
0.94085374 kg/m^3
3.54092601 m^3/s
3.54092601 m^3/s At 96 deg C and 1.013 bar
375.682 mg/m^3 of flue gas
4.789 kg/hr
1,583 kg/hr (Avg: 290 kg/hr fuel consumption at 30% MC (wet))6.57 kg air/kg fuel
11,993 kg/hr
11993 kg/hr
0.00257 kg SO2/kg of fuel
4.075 kg/hr
ption such as ideal gas and density conversion
6000 kg/hr
74.00% Gross basis
18 MJ/kg
12.06 MJ/kg
1583.299718 kg/hr
3.78955414 kg/kg
3.54092601 m3/s
onsidered)
0.620x0.620 mxm
.678 m http://www.engineeringtoolbox.com/equivalent-diamete
9.211566103 m/s
96 deg C
9.211566103 m/s
.678 m
-
7/31/2019 Biomass Combustion Manoj
6/16
scosity
0.0000204 m^2/s http://www.firecad.net/Boiler-Calculations/Boiler-Exhau
306,149
1 m
4.508447021 m/s
drop due to uninsulated duct)
86 deg C
0.0000194 m^2/s http://www.firecad.net/Boiler-Calculations/Boiler-Exhau
232,394
-
7/31/2019 Biomass Combustion Manoj
7/16
-
7/31/2019 Biomass Combustion Manoj
8/16
r-d_205.html
-
7/31/2019 Biomass Combustion Manoj
9/16
stGas-Properties.aspx
stGas-Properties.aspx
-
7/31/2019 Biomass Combustion Manoj
10/16
COMBUSTION TABLE FOR SOLID AND LIQUID FUELS
Molar weight Analysis Oxygen
Cont g/mol g/kg mol/kg mol/kg
C 12.01 336.00 27.98 27.98
H2
2.02 45.50 22.52 11.26
O2 32.00 301.00 9.41 -9.41
N2 28.01 4.20 0.15
S 32.06 0.23 0.01 0.01 Adjusted for measured SO2
Ash ---- 13.07 Adjusted for sum 1000
Water 18.02 300.00 16.65
Sum: ###### Sum O2: 29.84
Nitrogen in air 3.77 * O2 112.4968662
Sum dry air 142.34 lot
Humid ratio in air:
Total theoretical air need lo 142.34
Theoretical gas amount go 179.80
Theoretical dry gas got 140.63
CO2dry= O2dry= 29.840
CO2odry m= 2.650
O2wet= m=
Nitrogen due to air in excess
Oxygen due to air in excess
Water in air excess
Total air need 377.19 l
Total dry air 377.19 lt
Total gas 414.66 g
Total dry gas 375.49 gt
ppm
mg/Nm^3 (0 C 1 atm) (NERD report value)
mg/m^3 (Tfg C 1 atm)
Mass of gases (Real gas) kg/kg of fuel 11.86
Mass of gases (Dry gas)
Conclusion (m3n means normal cubic meter at 0C and 1,013 bar)
mol/kg m3n/kg
Theoretic dry air lot 142.34 3.19
Theoretical air lo 142.34 3.19
Real dry air lt 377.19 8.45
Real total air l 377.19 8.45
Calc of air excess factor gives m = 1.250
To get m3n/kg, multiply by molar volume 0.0224 m3n/mol
Fraction in real gas:
Fraction in dry gas:
-
7/31/2019 Biomass Combustion Manoj
11/16
Method 1Fuel flow 1,674
Air to Fuel ratio with the given excess air 10.88
Flue gas flow at the given fuel burning rate 19,881
5.522
Density of flue gas at 0 C 1 atm 1.277
Flue gas flow at 0 C 1 atm 4.323654924
Density of flue gas at 105 C 1 atm 0.922457832
Flue gas flow at 105 C 1 atm 5.986599126
1 Actual flue gas flow 5.986599126
SO2 composition 40.600
SO2 flow rate 0.875
Method 2
Fuel flow 1,674Air to Fuel ratio with the given excess air 10.88
Flue gas flow at the given fuel burning rate 19,881
1 Actual flue gas flow 19881
Ratio of SO2 mass/Flue gas mass 0.00046
SO2 flow rate 0.773
Remarks
Method 2 is more accurate because it has no assumption such as
FUEL CONSUMPTION AT MAXIMUM STEAM GENERATION
Boiler maximum steam generation at 8 barg & at 100 deg FW 6000
Boiler thermal efficiency 70.00%
GCV of fuel at dry condition 18
GCV of fuel at 33% moisture content 12.06
Maximum fuel consumption 1673.773987
Steam to fuel ratio at 8 barg & at 100 deg C 3.584713376
Flue gas volumetric flow at maximum steam generation 5.986599126
(Note: This flue gas flow is assumed to be without Ash as after scrubber is considered)
Duct size 0.620x0.620
Equivalent diameter .678
Flue gas velocity 15.5738791
Reynolds number calculation
Flue gas temperature 105
Velocity 15.5738791
Equivalent diameter .678
-
7/31/2019 Biomass Combustion Manoj
12/16
Re = VelocityxDiameter/Kinematic Viscosity
Kinematic viscosity of flue gas at this temperature 0.0000220
Reynolds number through duct 479,959
Conclusion: Flow is highly turbulent
Reynolds number through chimney
Chimney diameter 1
Velocity through chimney 7.622374745
Kinematic viscosity of flue gas temperature (assumed 10 deg C temperature drop due to unin
Considered temperature 95
Kinematic viscosity 0.0000210
Reynolds number through chimney 362,970
Conclusion: Flow is highly turbulent
-
7/31/2019 Biomass Combustion Manoj
13/16
FUEL : STP SLUDGE + SAW DUST
Fuel:
Flue gases (mol/kg) Considered composition dry basis
H2O CO2 N2 SO2 O2 Ar
27.98 48.0000% C
22.52 6.5000% H
43.0000% O
0.15 0.6000% N
0.007 0.0330% S
1.8670% Ash
16.65 100.0000%
39.17 27.98 0.15 0.01 0.00 0.00
112.497
Theoretical weight of flue gas
5.0906587 kg/kg of fuel
39.17 27.98 112.65 0.007 0.00 5.3567096 kg/kg of fuel (Calculat
Theoretical air requirement
4.1047928 kg of air / kg of fuel
4.1 kg of air/ kg of fu
185.62
49.24
0.00
39.17 27.98 298.27 0.00721 49.24 11.867613 kg/kg of fuel
1230.97 12.353535 kg/kg of fuel (Calculat
(CO2 mass per kg of Fuel)
0.094 0.067 0.719 0.00002 0.119 Real air requirement at the
0.075 0.794 0.00002 0.131 10.8777 kg of air/ kg of fu
19
55
41
0.705 1.231 8.351 0.00046 1.576
mol/kg m3n/kg fuel
Theoretic dry gas got 140.63 3.15
Theoretical gas go 179.80 4.03
Real dry gas gt 375.49 8.41 P=Ro.R.T
Real total gas g 414.66 9.29
-
7/31/2019 Biomass Combustion Manoj
14/16
kg/hr (Avg: 290 kg/hr fuel consumption at 30% MC (wet))
kg air/kg fuel
kg/hr
kg/s
kg/m^3
Nm^3/s
kg/m^3
m^3/s
m^3/s At 96 deg C and 1.013 bar
mg/m^3 of flue gas
kg/hr
kg/hr (Avg: 290 kg/hr fuel consumption at 30% MC (wet))kg air/kg fuel
kg/hr
kg/hr
kg SO2/kg of fuel
kg/hr
ideal gas and density conversion
kg/hr
Gross basis
MJ/kg
MJ/kg
kg/hr
kg/kg
m3/s
mxm
m http://www.engineeringtoolbox.com/equivalent-diameter-d_205.html
m/s
deg C
m/s
m
-
7/31/2019 Biomass Combustion Manoj
15/16
m 2/s http://www.firecad.net/Boiler-Calculations/Boiler-ExhaustGas-Properties.aspx
m
m/s
ulated duct)
deg C
m 2/s http://www.firecad.net/Boiler-Calculations/Boiler-ExhaustGas-Properties.aspx
-
7/31/2019 Biomass Combustion Manoj
16/16
d from molecular weight and density)
l
d from molecular weight and density)
given excess air
l