supercritical gasification of wet biomass · 2015-11-11 · biomass/waste streams (more than 70...
TRANSCRIPT
“Supercritical Gasificationof Wet Biomass”
KIVI-NIRIA Onderzoeksdag
19/05/2011 ir. Jan Withag
Introduction
� Problem Statement
� Super Critical Water Gasification (SCWG) converts wet
biomass/waste streams (more than 70 wt.% water) into medium
calorific gas.
� Rich in either Methane or Hydrogen
� Availability of wet biomass in the Netherlands is approximately
15*10^6 tonnes/year
� Energy potential of approximately 500 PJ [Koppejan 2005]
19-05-2011 2
Introduction Reactor Experiments CFD Conclusions Future Work
Project
� Biomass handling and feed preparation �
� Chemistry of supercritical gasification �
� Reactor design � &
� Product gas upgrading �
3
Introduction Reactor Experiments CFD Conclusions Future Work
19-05-2011
Goal
� Development of the process of
Supercritical Gasification of Wet
Biomass
� Look at chemical kinetics
� Heat transfer
� CO2 capture
� Come up with design rules
for a continuous reactor
design for Supercritical
Gasification of Wet Biomass
4
Introduction Reactor Experiments CFD Conclusions Future Work
19-05-2011
Supercritical water
5
Introduction Reactor Experiments CFD Conclusions Future Work
19-05-2011
� The benefits
� No drying of the wet biomass is necessary
� Complete miscibility of gases and organics
� Water acts both as solvent and as a reactant
� High hydrogen yield
Supercritical water
6
Introduction Reactor Experiments CFD Conclusions Future Work
7
REACTORBatch reactor with injection system
Schematic drawing
Introduction Reactor Experiments CFD Conclusions Future Work
19-05-2011
8
EXPERIMENTSSCWG of Methanol: Experimental results
Introduction Reactor Experiments CFD Conclusions Future Work
Tau_res = 10 [min]
Wt%_algae = 10 %
P_start = 260 [bar]
9
EXPERIMENTSSCWG of Micro Algae: Experimental results
Introduction Reactor Experiments CFD Conclusions Future Work
Tau_res = 1 [hr]
Wt%_algae = 7.4 %
P_start = 260 [bar]
CFDResearch goal
Outline Reactor Experiments CFD Conclusions Future Work
� Determination of heat transfer characteristics of biomass
gasification in supercritical water
� What is the influence of large property variations on the heat
transfer
� Can this be described using a 1D modeling approach?
� Is it necessary to use a 2D modeling approach?
19-05-2011 10EOS PROGRESS MEETING
CFD 1D modelThis model is used to compare with the 2D model
Outline Reactor Experiments CFD Conclusions Future Work
g
Nusselt correlaties
P = 30 MPa
G = 200 kg/m².s
D = 10 mm
L = 2.5m
Tw = 873 K
Tin = 573 degC
19-05-2011 11EOS PROGRESS MEETING
12
CFD 2D modelPipe flow model supercritical water
EOS PROGRESS MEETING
Outline Reactor Experiments CFD Conclusions Future Work P = 30 MPa
G = 200 kg/m².s
D = 10 mm
L = 2.5m
Tw = 873 K
Tin = 573 degC
19-05-2011
2500 mm.
13
CFD 2D modelPipe flow model supercritical water
EOS PROGRESS MEETING
Outline Reactor Experiments CFD Conclusions Future Work
T_wall
Massflow
Symmetry
Massflow
T_inlet = 573 K
Adiabatic
Adiabatic
Fluid
S
O
L
I
D
P = 30 MPa
G = 200 kg/m².s
D = 10 mm
L = 2.5m
Tw = 873 K
Tin = 573 degC
19-05-2011
14
CFD 2D modelTemperature comparison 1D and 2D
EOS PROGRESS MEETING
Outline Reactor Experiments CFD Conclusions Future Work
15-03-2011
Massflux = 200 [kg/m2 . s]
Inlet temperature = 573 [K]
Wall temperature = 873 [K]
15
CFD 2D model
EOS PROGRESS MEETING
Outline Reactor Experiments CFD Conclusions Future Work
02-09-2010
Velocity profiles at a mass flux of 20 [kg/m2.s]
16
CFD 2D modelVelocity profiles at a mass flux of 100 [kg/m2.s]
EOS PROGRESS MEETING
Outline Reactor Experiments CFD Conclusions Future Work
02-09-2010
17
CFD 2D modelVelocity profiles at a mass flux of 150 [kg/m2.s]
EOS PROGRESS MEETING
Outline Reactor Experiments CFD Conclusions Future Work
02-09-2010
18
CFD 2D modelVelocity profiles at a mass flux of 200 [kg/m2.s]
EOS PROGRESS MEETING
Outline Reactor Experiments CFD Conclusions Future Work
02-09-2010
19
CFD 2D modelVelocity & temperature profiles at a mass flux of 200 [kg/m2.s]
EOS PROGRESS MEETING
Outline Reactor Experiments CFD Conclusions Future Work
02-09-2010
Velocity Temperature
20EOS PROGRESS MEETING
CFD
02-09-2010
Conclusions
� A high throughput screening reactor for wet biomass is developed
and tested.
� A 2D model for heat transfer to sub- and supercritical water is
developed.
� The 2D models is validated using a dedicated experiment.
This work is in progress!
21ENERGY TECHNOLOGY CHAIR
Introduction Reactor Experiments CFD Future WorkConclusions
