CFD Burner Study for Entrained Flow Gasifiers Numerical Study of Different Burner Configurations in an Entrained Flow gasifiers 0.5 0.6 0.7 0.8 0.9 1 0 0.05 0.1 0.15 0.2 0.25 0.3 H/C molar ratio O/C molar ratio CPD RBC-1 RBC-2 LBC-1 LBC-2 LBC-3 CRC-252 CRC-272 CRC-274 CRC-299 CRC-358 XHL Newland Thomas Förster 1 , Andreas Richter 1 , Bernd Meyer 2 Institute of Energy Process Engineering and Chemical Engineering 18.05.2018, IEC Seminar 1 Center for Innovation Competence Virtuhcon, Germany 2 Institute of Energy Process Engineering and Chemical Engineering, TU Bergakademie Freiberg, Germany
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CFD Burner Study for Entrained Flow GasifiersNumerical Study of Different Burner Configurations in an Entrained Flow gasifiers
0.5
0.6
0.7
0.8
0.9
1
0 0.05 0.1 0.15 0.2 0.25 0.3
H/C
mol
arra
tio
O/C molar ratio
CPD
RBC-1
RBC-2
LBC-1
LBC-2
LBC-3CRC-252
CRC-272
CRC-274CRC-299CRC-358
XHLNewland
Thomas Förster1, Andreas Richter1, Bernd Meyer2
Institute of Energy Process Engineering and Chemical Engineering18.05.2018, IEC Seminar
1Center for Innovation Competence Virtuhcon, Germany2 Institute of Energy Process Engineering and Chemical Engineering, TU Bergakademie Freiberg, Germany
Motivation
Burner Development for Entrained Flow Gasification
State of the art
Central jet flows
Swirling and non-swirling jetflows
1 to 3 Distributed jet flows
Subjects of interest
Increasing performance
Shortened flame
Stability of the flame
Higher reaction rates
Bader et. al. 2018, Fuel Proc. Techn. 169
Zhang et. al. 2017, Can. J. of Chem. Eng.
TU Bergakademie Freiberg | T. Förster et al. | CFD Burner Study for Entrained Flow Gasifiers | 18.05.2018 1
Motivation
Different Burner Concepts for Non-Catalytic Partitial Oxidation of Natural Gas
Different burner concepts, Förster et. al. 2017, Fuel 203
Fuel
SteamOxidizer+ Steam
�16
(jet)
FuelOxidizer+ Steam
�77
(plate)
(spherical)
Förster et. al. 2017, Fuel 203
−20
−10
0
10
20
30
40
50
60
0 50 100 150 200 250 300
H2massflo
w,kg/h
Reactor length,mm
jetjet-swirl
platespherical
mH2, out
0Copyright of reuse by Elsevier/Fuel via RightsLink is obtained for the cited images
TU Bergakademie Freiberg | T. Förster et al. | CFD Burner Study for Entrained Flow Gasifiers | 18.05.2018 2
Outline
Burner Concepts Investigation for Entrained Flow Gasifiers
Fuel and Process Analysis for a Comprehensive CFD Model
Influence of the Burner Concept on the Reactor System
Conclusion and Outlook
TU Bergakademie Freiberg | T. Förster et al. | CFD Burner Study for Entrained Flow Gasifiers | 18.05.2018 3
Burner Concepts Investigation for Entrained Flow Gasifiers
Overview of the Reactor Design
Geometric boundary conditions
Geometry of the reactor
Geometry of the burners1
Velocity profile of fuel inletVelocity profile of the oxidizer inletVelocity profile of the moderator inletCharacteristics of the conveying system
Entrained flow coal gasifier (top fired)
Central jet burner
5.4 m high and � 2.3m
Siemens typegasifier
1Geometry influences the flow fields, Euler-Lagrange vs. real geometry
TU Bergakademie Freiberg | T. Förster et al. | CFD Burner Study for Entrained Flow Gasifiers | 18.05.2018 4
Burner Concepts Investigation for Entrained Flow Gasifiers
Burner Concepts (Inverse Models)
B1, central jet
B3, plate
B2, peripheral jet
B4, spherical
Siemens type reactor
TU Bergakademie Freiberg | T. Förster et al. | CFD Burner Study for Entrained Flow Gasifiers | 18.05.2018 5
Burner Concepts Investigation for Entrained Flow Gasifiers
Mesh
B1 and B2 central jets
Dimension: 2D,axis-symmetric
Size: 30k
Type: structured,quadrilateral
Calculation time:∼ 7 days
B3, plate
Dimension: 3D,symmetry
Size: 900k
Type: structured,hexahedral
Calculation time:∼ 50 days
B4, spherical
Dimension: 3D,symmetry
Size: 800k
Type: structured,hexahedral
Calculation time:∼ 50 days
TU Bergakademie Freiberg | T. Förster et al. | CFD Burner Study for Entrained Flow Gasifiers | 18.05.2018 6
Burner Concepts Investigation for Entrained Flow Gasifiers
CFD Setup
Setup for the CFD setup of the Siemens type gasifier1
Solver ANSYS Fluent
Turbulence realizable k-ε model
Radiation DO model
Turbulence chemical interaction Eddy-Dissipation Concept Model
Homogeneous mechanism reduced GRI 1.22
Gas phase properties kinetic theory
Particle tracking Euler-Lagrange
1Safronov et al. 2017, Fuel Proc. Techn. 1612Kazakov and Frenklach 1995, http://www.me.berkeley.edu/drm/3Badzioch and Hawksley 1970, Ind. Eng. Chem. Proc. Des. and Develop. 9(4)
TU Bergakademie Freiberg | T. Förster et al. | CFD Burner Study for Entrained Flow Gasifiers | 18.05.2018 7
Literature data3 are adapted for surface based kinetics4
1Schulze et al. 2017, Fuel 1872Gonzalez et al. 2018, Fuel 2243Kajitani et al. 2002, Fuel 814ANSYS Fluent Manual v172, ch. 7.3
TU Bergakademie Freiberg | T. Förster et al. | CFD Burner Study for Entrained Flow Gasifiers | 18.05.2018 14
Influence of the Burner Concept on the Reactor System
Flow Fields, Velocity Magnitude, vaxial = 0 ms
B1, jet central B1, swirl 60◦ B3, plate B4, spherical
TU Bergakademie Freiberg | T. Förster et al. | CFD Burner Study for Entrained Flow Gasifiers | 18.05.2018 15
Influence of the Burner Concept on the Reactor System
Gas Residence Time
B1, jet central B1, swirl 60◦ B3, plate B4, spherical
TU Bergakademie Freiberg | T. Förster et al. | CFD Burner Study for Entrained Flow Gasifiers | 18.05.2018 16
Influence of the Burner Concept on the Reactor System
Overall Particle Residence Times
B1, jet central
050100150200250300350400450
5 10 15 20 25
Cou
nt
Residence time, s
B3, plate
0
500
1000
1500
2000
2500
3000
3500
5 10 15 20 25
Cou
nt
Residence time, s
B1, swirl 60◦
0
100
200
300
400
500
600
5 10 15 20 25
Cou
nt
Residence time, s
B4, spherical
0
500
1000
1500
2000
2500
3000
3500
5 10 15 20 25
Cou
nt
Residence time, s
TU Bergakademie Freiberg | T. Förster et al. | CFD Burner Study for Entrained Flow Gasifiers | 18.05.2018 17
Influence of the Burner Concept on the Reactor System
Heterogeneous Burnout, rC+O2 = 0.1 kmolm3 s
B1, jet central B1, swirl 60◦ B3, plate B4, spherical
TU Bergakademie Freiberg | T. Förster et al. | CFD Burner Study for Entrained Flow Gasifiers | 18.05.2018 18
Conclusion and Outlook
Conclusion
State of the art CFD models for detailed conversion analysis are available
Different burner concepts including swirl were investigated for the prove of generalconcept
The burner configuration has a great impact on flow and particle dynamics in a reactor
Findings for single-phase systems cannot be transfered directly to multiphase systems.
Next steps
Additional burner concepts will be studied
Implementation of new fuel datasets based on in-house measurements
Usage of ROMs for a better pre-assessment of boundary conditions for CFD
TU Bergakademie Freiberg | T. Förster et al. | CFD Burner Study for Entrained Flow Gasifiers | 18.05.2018 19
Thank you for your kind attention!This research has been funded as part of ProVirt by the European Social Fund (ESF) and theFree State of Saxony (project number 100231952).
TU Bergakademie Freiberg | T. Förster et al. | CFD Burner Study for Entrained Flow Gasifiers | 18.05.2018 20