Numerical Analysis of a Radiant Syngas Cooler

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1 Numerical Analysis of a Radiant Syngas Cooler Folie 2, Dr.-Ing. Gerd Oeljeklaus, Universität Duisburg-Essen Universität Duisburg-Essen Prof. Dr.-Ing., Universität Duisburg-Essen - Ulrich Günther Siemens Fuel Gasification GmbH & Co. KG

2 Contents Motivation Application of a Radiant Syngas Cooler in an IGCC Overview of the CFD Models, boary conditions Results Summary and Outlook Folie 3

3 Motivation Mathematical model of multiphase flow and heat transfer of Radiant Syngas Cooler has to be developed in more detail Behavior of the Radiant Syngas Cooler concerning: velocity and temperature distribution heat flux distribution onto the walls ash/slag particle concentration distribution Simulation of the Radiant Syngas Cooler with the CFD Code ANSYS FLUENT Folie 4

4 Schematic structure of an IGCC Gasification Process Combined Cycle Process Folie 5 Gas unit Source:

5 Gas unit H 2 O O 2 Fuel Gasifier Heating surface Pressure vessel Quench water Radiant Syngas Cooler Quench unit Syngas Folie 6 Granulated slag Source:

6 Simplifications of the geometry for modeling L B B L B B Folie 7

7 Overview of the CFD Models, boary conditions Folie 8 Mathematical Models: Turbulence Model: Realizable k-ε Radiation Model: P-1 Model Absorption coefficient: WSGG-Model DPM: Random Walk, Two-Way Coupling Boary Conditions: Operating Pressure: 4.2 MPa Particle: Particle Size Distribution Walls: Constant Temperature; DPM Escape (Worst-Case) Load conditions: Part Load: 70 % Normal Load: 100 % (Reference Case) Peak Load: 105 %

8 Results Folie 9

9 Temperature and streamline distribution at different loads % 100 % 105 % [K] T out = 857 K T out = 987 K T out = 1018 K Folie [-] related velocity re-attachment point

10 Temperature distribution at normal load condition 1923 [K] 663 Folie 11

11 Heat flux distribution at the walls at different loads % 100 % 105 % inner walls [-] < 0.01 related heat flux 0.40 outer wall [-] < 0.01 related heat flux Folie 12

12 Slag/ash particle concentration distribution in the gas phase for different loads 70 % 100 % 105 % Folie 13 [-] related particle mass concentration in the gas phase

13 Slag/ash particle mass flux density distribution at the walls for normal load condition Folie 14 [-] related particle mass flux density

14 Summary and Outlook Folie 15

15 Summary Load condition influence: Velocity and temperature distributions - Buoyancy and recirculation zones have a great influence Area of highest value of heat flux onto the walls - Heat flux is influenced by radiation and convection in a similar order of magnitude Slag/ash particle concentration distribution - Worst-case: Slag/ash particle are sticking to the wall at contact Folie 16

16 Outlook Enhancement of the radiation model by the absorption coefficient, e.g. EWBM (=Exponential Wide Band Model) Integration of a deposition model for simulation of the interaction between particle and wall Folie 17

17 Acknowledgement This work is carried out er the project TEIMAB (Grant No C) and is sponsored by: In the framework of: Folie 18

18 Thank you for your attention Folie 19

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