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University of Technology
[email protected] Division of Energy Conversion
Fluidized bed technologybeneficial for SNG production
Martin SeemannDivision of Energy Technology
Chalmers University of Technology
University of Technology
[email protected] Division of Energy Conversion
GoBiGas Gothenburg Biomass Gasification Project
• Gasification of biomass and production of biomethane
• Commercial scale–approximately 100 MW gas -with the potential of producing 800 biomethane GWh per year
• High-calorific gas(SNG) by methanation for distribution in the existing gas grid
• Also possible to use the gas as fuel in Rya CHP-plant
• Situated in the harbour of Gothenburgwith the potential to transport fuel by boat or train
• Cooperation with E.on
University of Technology
[email protected] Division of Energy Conversion
Biomass to SNG Process
Gas Cleaning
Tars, S, Cl,.
MethanesynthesisGasification Gas
upgrading
CO280% of carbon bound
In the solid fuel
SNG
Sour
ce: w
ww
.mor
guef
ile.c
om
Sour
ce: w
ww
.mor
guef
ile.c
om
University of Technology
[email protected] Division of Energy Conversion
Indirect gasificationCirculating fluidized bed (CFB)
Gasification
Heat, Electricity, Steam Heat, Electricity, Steam
Hot
Bed
Mat
eria
l
Air
Fuel Fuel
Hot
Bed
Mat
eria
l
Air
Fuel
Steam, Flue GasOr Air
Combustible Gas
Before ReconstructionCirculating bedBubbling beds
After Reconstruction
University of Technology
[email protected] Division of Energy Conversion
Typical raw gas composition (indirect gasification)
H2 23 % CO 43 % CO2 14 % CH4 13 %C2H4 ~3 % Product! C2H6 ~0.5 % Tars up to 3 % Problem!
Gas Cleaning
Tars, S, Cl,.
Gasification
University of Technology
[email protected] Division of Energy Conversion
Biomass to SNG Process
Gas Cleaning
Tars, S, Cl,.
MethanesynthesisGasification Gas
upgrading
CO2, (H2)80% of carbon bound
In the solid fuel
SNG
Sour
ce: w
ww
.mor
guef
ile.c
om
Sour
ce: w
ww
.mor
guef
ile.c
om
University of Technology
[email protected] Division of Energy Conversion
Synthesis of Methane
CO + 3 H2 CH4 + H2O Methanation
CO + H2O CO2 + H2 Watergas Shift
C6H6 + 6 H2O 6 CO + 9 H2 Steam Reforming
Methanesynthesis
University of Technology
[email protected] Division of Energy Conversion
0.0 0.2 0.4 0.6 0.8 1.0
0.0
0.2
0.4
0.6
0.8
1.0 0.0
0.2
0.4
0.6
0.8
1.0
O
C
H2
CO2
CO
O2
Carbondeposition
region
H2O
H2/CO=3
CH4
H
Gasification
Gasuppgrading
SNG
Methanation
Reforming>800°C
Shift400-500°C
Fixed bed Methanation
Gas Cleaning
University of Technology
[email protected] Division of Energy Conversion
0.0 0.2 0.4 0.6 0.8 1.0
0.0
0.2
0.4
0.6
0.8
1.0 0.0
0.2
0.4
0.6
0.8
1.0
O
C
H2
CO2
CO
O2
Carbondeposition
region
H2O
H2/CO=3
CH4
H
Gasification
Gas uppgrading
SNG
Methanation
Fluidized bed Methanation
University of Technology
[email protected] Division of Energy Conversion
Comparison Fluidbed vs FixedbedFluidized bed Fixed bed
University of Technology
[email protected] Division of Energy Conversion
Comparison Fluidbed vs FixedbedFluidized bed Fixed bed
University of Technology
[email protected] Division of Energy Conversion
Regenerating effect of fluidizationH
eigh
t [m
m]
[mol/min]
0.00
0.010.02
0.04
0.06
0.08
0.10
0.12
0
20
40
60
80
100
120
140
Hei
ght [
mm
]
[mol/min]
0
20
40
60
80
100
120
140
-0.02
-0.01
0.00
0.01
0.02
0.03
H2O CH4 H2 CO2 CO
CO + 3 H2 CH4 +H2O
CO + H2O CO2 + H2
C + H2O H2 + CO
CO C* + O*
University of Technology
[email protected] Division of Energy Conversion
Regenerating effect of fluidizationH
eigh
t [m
m]
[mol/min]
0.00
0.010.02
0.04
0.06
0.08
0.10
0.12
0
20
40
60
80
100
120
140
Hei
ght [
mm
]
[mol/min]
0
20
40
60
80
100
120
140
-0.02
-0.01
0.00
0.01
0.02
0.03
H2O CH4 H2 CO2 CO
CO + 3 H2 CH4 +H2O
CO + H2O CO2 + H2
CO C* + O*
C + H2O H2 + CO
