scholarly journals Multiphase CFD modeling of front propagation in a Hele-Shaw cell featuring a localized constriction

2021 ◽  
Vol 6 (8) ◽  
Author(s):  
Jonatan R. Mac Intyre ◽  
Antti Puisto ◽  
Marko Korhonen ◽  
Mikko Alava ◽  
Jordi Ortín
Keyword(s):  
Front Propagation ◽  
Cfd Modeling ◽  
Multiphase Cfd ◽  
Hele Shaw Cell

Multiphase CFD Modeling for a Chemical Looping Combustion Process (Fuel Reactor)

2008 ◽  
Vol 31 (12) ◽  
pp. 1754-1766 ◽  
Author(s):  
Z. G. Deng ◽  
R. Xiao ◽  
B. S. Jin ◽  
Q. L. Song ◽  
H. Huang
Keyword(s):  
Combustion Process ◽  
Cfd Modeling ◽  
Chemical Looping Combustion ◽  
Chemical Looping ◽  
Fuel Reactor ◽  
Multiphase Cfd

Multiphase CFD modeling - scale-up of Fluidized-Bed Crystallizer

2009 ◽  
pp. 695-700 ◽  
Author(s):  
Mohsen Al-Rashed ◽  
Janusz Wójcik ◽  
Roch Plewik ◽  
Piotr Synowiec ◽  
Agata Kuś
Keyword(s):  
Fluidized Bed ◽  
Scale Up ◽  
Cfd Modeling ◽  
Multiphase Cfd

Multiphase CFD modeling: Fluid dynamics aspects in scale-up of a fluidized-bed crystallizer

2013 ◽  
Vol 63 ◽  
pp. 7-15 ◽  
Author(s):  
Mohsen Al-Rashed ◽  
Janusz Wójcik ◽  
Roch Plewik ◽  
Piotr Synowiec ◽  
Agata Kuś
Keyword(s):  
Fluid Dynamics ◽  
Fluidized Bed ◽  
Scale Up ◽  
Cfd Modeling ◽  
Multiphase Cfd

Recovery boiler sootblowers: History and technological advances

TAPPI Journal ◽  
2015 ◽  
Vol 14 (1) ◽  
pp. 51-60
Author(s):  
HONGHI TRAN ◽  
DANNY TANDRA
Keyword(s):  
Cfd Modeling ◽  
Computing Systems ◽  
The Past ◽  
Technological Advances ◽  
Recovery Boilers ◽  
Computational Fluid Dynamics Cfd ◽  
Recovery Boiler ◽  
Steam Parameters ◽  
Insight Into ◽  
Deposit Removal

Sootblowing technology used in recovery boilers originated from that used in coal-fired boilers. It started with manual cleaning with hand lancing and hand blowing, and evolved slowly into online sootblowing using retractable sootblowers. Since 1991, intensive research and development has focused on sootblowing jet fundamentals and deposit removal in recovery boilers. The results have provided much insight into sootblower jet hydrodynamics, how a sootblower jet interacts with tubes and deposits, and factors influencing its deposit removal efficiency, and have led to two important innovations: fully-expanded sootblower nozzles that are used in virtually all recovery boilers today, and the low pressure sootblowing technology that has been implemented in several new recovery boilers. The availability of powerful computing systems, superfast microprocessors and data acquisition systems, and versatile computational fluid dynamics (CFD) modeling capability in the past two decades has also contributed greatly to the advancement of sootblowing technology. High quality infrared inspection cameras have enabled mills to inspect the deposit buildup conditions in the boiler during operation, and helped identify problems with sootblower lance swinging and superheater platens and boiler bank tube vibrations. As the recovery boiler firing capacity and steam parameters have increased markedly in recent years, sootblowers have become larger and longer, and this can present a challenge in terms of both sootblower design and operation.

WET BURNING – THE MODERN TREND IN ENVIRONMENTAL BENIGN FUEL COMBUSTION AND IN SOLUTION TO THE PROBLEM OF SUSTAINABLE DEVELOPMENT OF THE POWER GENERATION

2018 ◽  
pp. 96-117 ◽  
Author(s):  
B. S. Soroka
Keyword(s):  
Numerical Simulation ◽  
Nitrogen Oxides ◽  
Chemical Kinetics ◽  
Fuel Combustion ◽  
Transport Processes ◽  
Cfd Modeling ◽  
Furnace Chamber ◽  
Modern Trend ◽  
Atmospheric Air ◽  
No Formation

The article considers the role and place of water and water vapor in combustion processes with the purpose of reduction the effluents of nitrogen oxides and carbon oxide. We have carried out the complex of theoretical and computational researches on reduction of harmful nitrogen and carbon oxides by gas fuel combustion in dependence on humidity of atmospheric air by two approaches: CFD modeling with attraction of DRM 19 chemical kinetics mechanism of combustion for 19 components along with Bowman’s mechanism used as “postprocessor” to determine the [NO] concentration; different thermodynamic models of predicting the nitrogen oxides NO formation. The numerical simulation of the transport processes for momentum, mass and heat being solved simultaneously in the united equations’ system with the chemical kinetics equations in frame of GRI methane combustion mechanism and NO formation calculated afterwards as “postprocessor” allow calculating the absolute actual [CO] and [NO] concentrations in dependence on combustion operative conditions and on design of furnace facilities. Prediction in frame of thermodynamic equilibrium state for combustion products ensures only evaluation of the relative value of [NO] concentration by wet combustion the gas with humid air regarding that in case of dry air – oxidant. We have developed the methodology and have revealed the results of numerical simulation of impact of the relative humidity of atmospheric air on harmful gases formation. Range of relative air humidity under calculations of atmospheric air under impact on [NO] and [CO] concentrations at the furnace chamber exit makes φ = 0 – 100%. The results of CFD modeling have been verified both by author’s experimental data and due comparing with the trends stated in world literature. We have carried out the complex of the experimental investigations regarding atmospheric air humidification impact on flame structure and environmental characteristics at natural gas combustion with premixed flame formation in open air. The article also proposes the methodology for evaluation of the nitrogen oxides formation in dependence on moisture content of burning mixture. The results of measurements have been used for verification the calculation data. Coincidence of relative change the NO (NOx) yield due humidification the combustion air revealed by means of CFD prediction has confirmed the qualitative and the quantitative correspondence of physical and chemical kinetics mechanisms and the CFD modeling procedures with the processes to be studied. A sharp, more than an order of reduction in NO emissions and simultaneously approximately a two-fold decrease in the CO concentration during combustion of the methane-air mixture under conditions of humidification of the combustion air to a saturation state at a temperature of 325 K.

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