Numerical study of H 2 O addition effects on pulverized coal oxy-MILD combustion

2015 ◽  
Vol 138 ◽  
pp. 252-262 ◽  
Author(s):  
Yaojie Tu ◽  
Hao Liu ◽  
Kai Su ◽  
Sheng Chen ◽  
Zhaohui Liu ◽  
...  
Keyword(s):  
Numerical Study ◽  
Pulverized Coal ◽  
Mild Combustion

Numerical Study of Pulverized Coal MILD Combustion in a Self-Recuperative Furnace

2015 ◽  
Vol 29 (11) ◽  
pp. 7650-7669 ◽  
Author(s):  
Manabendra Saha ◽  
Alfonso Chinnici ◽  
Bassam B. Dally ◽  
Paul R. Medwell
Keyword(s):  
Numerical Study ◽  
Pulverized Coal ◽  
Mild Combustion

Numerical Study on the Erosion Characteristics of U-Type Bend for Gas Solid Flow

2017 ◽  
Author(s):  
Yu Wang ◽  
Qi He ◽  
Ming Liu ◽  
Weixiong Chen ◽  
Junjie Yan
Keyword(s):  
Particle Size ◽  
Erosion Rate ◽  
Loading Rate ◽  
Pipe Wall ◽  
Numerical Study ◽  
Pulverized Coal ◽  
Mass Loading ◽  
Two Phase ◽  
Inlet Velocity ◽  
Pipe System

In pulverized coal-fired plant, the U-type bend is commonly used in flue gas and pulverized coal pipe system to due to the constraints of outer space. And gas-solid two-phase flow exists in these pipelines. The erosion of the pipe has significant effect on the safety and reliability of pipelines. In present paper, the erosion characteristics of U-type bend were investigated through CFD (Computational Fluid Dynamics) method. The wear distribution on the pipe wall was obtained. And the particle flow characteristics in U-type bend were analyzed. The influence of inlet velocity, mass loading rate and particle size on the erosion rate was studied as well. Result suggested that the maximum erosion rate increases exponentially with the increase of inlet velocity. And maximum erosion rate increases linearly with the increasing mass loading rate. Increasing particle size can aggravate the wear on the pipe wall.

scholarly journals Numerical study of flame structure in the mild combustion regime

2015 ◽  
Vol 19 (1) ◽  
pp. 21-34 ◽  
Author(s):  
Amir Mardani ◽  
Sadegh Tabejamaat
Keyword(s):  
Fuel Injection ◽  
Numerical Study ◽  
Flame Structure ◽  
Combustion Regime ◽  
Low Oxygen ◽  
Mixing Rate ◽  
Jet Flame ◽  
Reduced Mechanism ◽  
Mild Combustion ◽  
O2 Concentration

In this paper, turbulent non-premixed CH4+H2 jet flame issuing into a hot and diluted co-flow air is studied numerically. This flame is under condition of the moderate or intense low-oxygen dilution (MILD) combustion regime and related to published experimental data. The modelling is carried out using the EDC model to describe turbulence-chemistry interaction. The DRM-22 reduced mechanism and the GRI2.11 full mechanism are used to represent the chemical reactions of H2/methane jet flame. The flame structure for various O2 levels and jet Reynolds numbers are investigated. The results show that the flame entrainment increases by a decrease in O2 concentration at air side or jet Reynolds number. Local extinction is seen in the upstream and close to the fuel injection nozzle at the shear layer. It leads to the higher flame entertainment in MILD regime. The turbulence kinetic energy decay at centre line of jet decreases by an increase in O2 concentration at hot Co-flow. Also, increase in jet Reynolds or O2 level increases the mixing rate and rate of reactions.

NUMERICAL STUDY OF DIFFUSION COMBUSTION OF PULVERIZED COAL IN A GAS JET

2021 ◽  
Vol 62 (3) ◽  
pp. 484-489
Author(s):  
E. B. Butakov ◽  
V. A. Kuznetsov ◽  
A. V. Minakov ◽  
A. A. Dekterev ◽  
S. V. Alekseenko
Keyword(s):  
Numerical Study ◽  
Pulverized Coal ◽  
Gas Jet ◽  
Diffusion Combustion

Numerical simulations on Oxy-MILD combustion of pulverized coal in an industrial boiler

2018 ◽  
Vol 181 ◽  
pp. 361-374 ◽  
Author(s):  
Diego Perrone ◽  
Teresa Castiglione ◽  
Adam Klimanek ◽  
Pietropaolo Morrone ◽  
Mario Amelio
Keyword(s):  
Numerical Simulations ◽  
Pulverized Coal ◽  
Mild Combustion ◽  
Industrial Boiler

scholarly journals Numerical study of hydrogen mild combustion

2009 ◽  
Vol 13 (3) ◽  
pp. 59-67 ◽  
Author(s):  
Enrico Mollica ◽  
Eugenio Giacomazzi ◽  
Marco di
Keyword(s):  
Numerical Study ◽  
Fluid Dynamic ◽  
Thermal Gradients ◽  
Radiation Model ◽  
Dynamic Simulations ◽  
Mild Combustion ◽  
Preheating Temperature ◽  
Nitric Oxide Emissions ◽  
Gas Recirculation ◽  
Good Agreement

In this article a combustor burning hydrogen and air in mild regime is numerically studied by means of computational fluid dynamic simulations. All the numerical results show a good agreement with experimental data. It is seen that the flow configuration is characterized by strong exhaust gas recirculation with high air preheating temperature. As a consequence, the reaction zone is found to be characteristically broad and the temperature and concentrations fields are sufficiently homogeneous and uniform, leading to a strong abatement of nitric oxide emissions. It is also observed that the reduction of thermal gradients is achieved mainly through the extension of combustion in the whole volume of the combustion chamber, so that a flame front no longer exists ('flameless oxidation'). The effect of preheating, further dilution provided by inner recirculation and of radiation model for the present hydrogen/air mild burner are analyzed.

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