Numerical simulation of pulverized coal combustion and NO formation |
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| Affiliation: | 1. Institute of Energy and Power Plant Technology, Dept. of Mechanical and Process Engineering, Technical University of Darmstadt, Jovanka-Bontschits-Str. 2, 64847 Darmstadt, Germany;2. Institute of Heat and Mass Transfer, Dept. of Mechanical Engineering, RWTH Aachen University, Augustinerbach 6, 52062 Aachen, Germany;1. Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Zagreb, Croatia;2. AVL List GmbH, Hans List Platz 1, Graz, Austria;3. MOE Key Laboratory of Thermo-Fluid Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China |
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| Abstract: | A pure two-fluid model, instead of the Eulerian gas-Lagrangian particle models (particle trajectory models), is used for simulating three-dimensional (3-D) turbulent reactive gas–particle flows and coal combustion. To improve the simulation of the flow field and NOX formation, a modified k–ε–kp two-phase turbulence model and a second-order-moment (SOM) reactive rate model are proposed. The proposed models are used to simulate NO formation (fuel NO produced by NH3) of methane–air combustion, and the prediction results are compared with those using the pure presumed PDF-finite-reaction-rate model and experimental data. The modified k–ε model and SOM model are more reasonable than the standard k–ε model and the pure presumed PDF-finite-reaction-rate model. The proposed models are also used to predict the coal combustion and NO formation at the exit of a double air register swirl pulverized-coal burner. The predicted results indicate that a pulverized-coal concentrator installed in the primary-air tube of burner has a strong effect on the coal combustion and NOX formation. |
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