scholarly journals Vaporization model for arsenic during single-particle coal combustion: Model development

2019 ◽  
Vol 205 ◽  
pp. 534-546 ◽  
Author(s):  
Huimin Liu ◽  
Chunbo Wang ◽  
Yue Zhang ◽  
Chan Zou ◽  
Edward Anthony
Keyword(s):  
Single Particle ◽  
Coal Combustion ◽  
Model Development ◽  
Combustion Model

scholarly journals SENSITIVE ANALYSIS OF A COAL COMBUSTION MODEL ON A DROP TUBE FURNACE

2013 ◽  
Vol 12 (2) ◽  
pp. 51
Author(s):  
L. Zimmer ◽  
F. M. Pereira ◽  
P. S. Schneider
Keyword(s):  
Coal Combustion ◽  
Reference Model ◽  
Sensitivity Study ◽  
Tube Furnace ◽  
Combustion Model ◽  
Drop Tube ◽  
Drop Tube Furnace ◽  
Flow Heat ◽  
Working Parameters ◽  
Good Agreement

In the present work a one-dimensional model for coal combustion in a Drop Tube Furnace (DTF) is developed. The equations that characterize the flow, heat transfer phenomena and coal combustion reactions are programmed in a FORTRAN90 language code. The results are compared with a reference model and experimental data, showing good agreement. A sensitivity study is performed to understand the behavior of coal combustion due to changes of some working parameters of the DTF. From the variation of the oxygen concentration, working temperature and input flow rates the response of the coal combustion in terms of unburned fraction can be obtained.

Vaporization model of arsenic during single-particle coal combustion: Numerical simulation

Fuel ◽  
2021 ◽  
Vol 287 ◽  
pp. 119412
Author(s):  
Huimin Liu ◽  
Chunbo Wang ◽  
Chan Zou ◽  
Yue Zhang ◽  
Edward Anthony
Keyword(s):  
Numerical Simulation ◽  
Single Particle ◽  
Coal Combustion

Analysis of Pulverized Coal Combustion in Precalciner Based on Fluent Software

2014 ◽  
Vol 635-637 ◽  
pp. 40-43
Author(s):  
Li Long Dong ◽  
Wei Lin Zhao ◽  
Ning Ning Xing
Keyword(s):  
Coal Combustion ◽  
Energy Equation ◽  
Internal Flow ◽  
Decomposition Temperature ◽  
Pulverized Coal ◽  
Combustion Model ◽  
Pulverized Coal Combustion ◽  
Three Dimension ◽  
Turbulence Flow ◽  
Fluent Software

The pulverized coal combustion in precalciner in the cement plant with capacity of 5000t/d was investigated by numerical calculation using Fluent software. The standard k-ε model and particle stochastic trajectory model was proposed to simulate the three-dimension turbulence flow and pulverized coal movement respectively. The energy equation including P1 raditional model and non-premixed combustion model were applied to calculate the internal flow field of temperature and concentrations of volatile, CO, O2 and CO2. It indicates that the structure of precalciner is well designed and the pulverized coal can burn quickly after injecting from burners. The decomposition temperature that production needed is satisfied and the concentrations after combustion are accepted.

Common Rail Multi-Jet Diesel Engine Combustion Model Development for Control Purposes

2007 ◽  
Author(s):  
Fabrizio Ponti ◽  
Enrico Corti ◽  
Gabriele Serra ◽  
Matteo De Cesare
Keyword(s):  
Diesel Engine ◽  
Model Development ◽  
Common Rail ◽  
Combustion Model ◽  
Engine Combustion

scholarly journals Advancing predictive models for particulate formation in turbulent flames via massively parallel direct numerical simulations

2014 ◽  
Vol 372 (2022) ◽  
pp. 20130324 ◽  
Author(s):  
Fabrizio Bisetti ◽  
Antonio Attili ◽  
Heinz Pitsch
Keyword(s):  
Internal Combustion Engines ◽  
Fossil Fuels ◽  
Soot Formation ◽  
Model Development ◽  
Turbulent Flames ◽  
Pollutant Emissions ◽  
Combustion Model ◽  
Carbon Abatement ◽  
Physico Chemical ◽  
Combustion Modelling

Combustion of fossil fuels is likely to continue for the near future due to the growing trends in energy consumption worldwide. The increase in efficiency and the reduction of pollutant emissions from combustion devices are pivotal to achieving meaningful levels of carbon abatement as part of the ongoing climate change efforts. Computational fluid dynamics featuring adequate combustion models will play an increasingly important role in the design of more efficient and cleaner industrial burners, internal combustion engines, and combustors for stationary power generation and aircraft propulsion. Today, turbulent combustion modelling is hindered severely by the lack of data that are accurate and sufficiently complete to assess and remedy model deficiencies effectively. In particular, the formation of pollutants is a complex, nonlinear and multi-scale process characterized by the interaction of molecular and turbulent mixing with a multitude of chemical reactions with disparate time scales. The use of direct numerical simulation (DNS) featuring a state of the art description of the underlying chemistry and physical processes has contributed greatly to combustion model development in recent years. In this paper, the analysis of the intricate evolution of soot formation in turbulent flames demonstrates how DNS databases are used to illuminate relevant physico-chemical mechanisms and to identify modelling needs.

scholarly journals Specific Features of Solid Fuels Combustion in Oxygen Atmosphere with Recirculation of CO2

2015 ◽  
Vol 17 (3) ◽  
pp. 213
Author(s):  
D.A. Melnikov ◽  
G.A. Ryabov
Keyword(s):  
Coal Combustion ◽  
Carbon Capture ◽  
Circulating Fluidized Bed ◽  
Combustion Process ◽  
Carbon Capture And Storage ◽  
Combustion Model ◽  
Coal Pyrolysis ◽  
Char Particle ◽  
Isothermal Kinetic ◽  
Gasification Reaction

<p>Aspects of coal combustion have been experimentally studied under oxyfuel conditions, one of the promising technologies for carbon capture and storage (CCS). Here, the thermogravimetric analysis (TGA) method was chosen as an experimental technique. Coal pyrolysis tests performed under an O<sub>2</sub>/CO<sub>2</sub> atmosphere were compared with a conventional O<sub>2</sub>/N<sub>2</sub> environment in terms of reaction rate and total volatile yield. Combustion of the resulting chars in the corresponding atmospheres revealed somewhat different combustion rates with a less vigorous reaction in the O<sub>2</sub>/CO<sub>2</sub> medium. The two manipulated factors – namely, the inherently different char reactivities due to the different atmospheres they were obtained in and the different atmospheres of the actual combustion process – were distinguished by performing another series of tests with chars pyrolysed under identical conditions using a standard routine. These chars also showed a weaker reaction in O<sub>2</sub>/CO<sub>2</sub> atmosphere, which was attributed to the lower binary diffusion coefficient of the O<sub>2</sub>/CO<sub>2</sub> pair. The activity of the char – CO<sub>2 </sub>gasification reaction in an O<sub>2</sub>/CO<sub>2</sub> environment was also investigated and revealed some contribution of this reaction to the conversion process. This was particularly noticeable at temperatures above 750 °C and under an internal diffusional controlled regime (zone II), implying displacement of oxygen out of the char particle pore volume, which allowed free reaction of CO<sub>2</sub> on the developed pore surface. Non-isothermal kinetic analysis of the intrinsic kinetics of the oxidation reaction in O<sub>2</sub>/CO<sub>2</sub> revealed no particular difference compared to the O<sub>2</sub>/N<sub>2</sub> medium, at least when the char-CO<sub>2 </sub>reaction was inhibited. The obtained data were used to develop a coal combustion model under O<sub>2</sub>/CO<sub>2</sub> conditions, which was then incorporated as a combustion module into circulating fluidized bed (CFB) computation software.</p>

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