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Abstract

Using alternative fuels (AF) in industry high consuming energy where fossil fuels are largely consumed may be a great solution to decrease CO2 emission and cost production. Or, when using these alternative fuels, the combustion may be difficult to control regarding the different components of AFs compared to fossil fuels. In this case, the use of the computational fluid dynamics CFD tools is a great solution to predict the AFs combustion behavior. This paper represents a computational study of petcoke and olive pomace (OP) co-combustion in a cement rotary kiln burner, established on the commercial CFD software ANSYS FLUENT. This study presents a useful key to choose an adequate simulation model that well predicts co-combustion problems. The performance of the K-ϵ turbulence models varieties (standard, Realizable, and Re-Normalization Group) combined with the hybrid finite rate/eddy dissipation model and the simple eddy dissipation model for predicting the co-combustion characteristics was investigated. The particle phase solutions are obtained using the Lagrangian approach. The performance of the mentioned model was evaluated based on the mesh accuracy, convergence time, temperature shape, and important chemical elements concentration. The predicted values of species concentrations and temperature are compared to the results obtained from the real case study and available literature. The standard K-ϵ model combined with the hybrid finite rate/eddy dissipation model gives the best results and the lower computational resources required for the 2-D model realized.

Open access

Abstract

Using alternative fuels (AF) in industry high consuming energy where fossil fuels are largely consumed may be a great solution to decrease CO2 emission and cost production. Or, when using these alternative fuels, the combustion may be difficult to control regarding the different components of AFs compared to fossil fuels. In this case, the use of the computational fluid dynamics CFD tools is a great solution to predict the AFs combustion behavior. This paper represents a computational study of petcoke and olive pomace (OP) co-combustion in a cement rotary kiln burner, established on the commercial CFD software ANSYS FLUENT. This study presents a useful key to choose an adequate simulation model that well predicts co-combustion problems. The performance of the K-ϵ turbulence models varieties (standard, Realizable, and Re-Normalization Group) combined with the hybrid finite rate/eddy dissipation model and the simple eddy dissipation model for predicting the co-combustion characteristics was investigated. The particle phase solutions are obtained using the Lagrangian approach. The performance of the mentioned model was evaluated based on the mesh accuracy, convergence time, temperature shape, and important chemical elements concentration. The predicted values of species concentrations and temperature are compared to the results obtained from the real case study and available literature. The standard K-ϵ model combined with the hybrid finite rate/eddy dissipation model gives the best results and the lower computational resources required for the 2-D model realized.

Open access

Due to the ISM band being unlicensed for communication applications, a lot of applications have been developed in this band and a good example is WiFi IEEE 802.11a, b, g, n of Bluetooth. This numeracy of applications motivated this paper. The paper is concerned with the design of a low distortion 20 dBm 2.4 GHz class-J power amplifier (PA) since PAs are indispensable in radio communications. The design is based on the AVAGO ATF-52189 transistor with a transition frequency of 6 GHz. The design is done as a hybrid circuit network realized using microstrip elements and surface mount device (SMD) capacitors. The schematic design and simulation are carried out using Keysight's Advanced Design System version 2016.01. The simulated PA exhibited a drain efficiency of 69% and a power output of 21 dBm.

Open access

. [7] Bo Z. , Ding S. , Elhabian T. ( 2005 ), Study on fast acquisition of hybrid DS/FHSS . Chinese Journal of Aeronautics , 18 ( 2 ), 161 – 165

Open access

. ( 2006 ), Hybrid Ventilation in Non-Residential Buildings . Earthscan , London [11] Witthauer J. , Horn H. , Bischof W. ( 1993

Open access

( 2017 ), Improvement of low-temperature impact toughness for 304 weld joint produced by laser-MIG hybrid welding under magnetic fi eld . Journal of Materials Processing Tech. , 247 , 306 – 314 . [25

Open access

. [20] Tran D. A. , Virazel A. , Bosio A. , Dilillo L. , Girard P. , Pravossoudovitch S. , Wunderlich H. -J. ( 2014 ), A new hybrid fault-tolerant architecture for

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-assisted bicycle, and one called an e-bike in [ 12 ]. This system has been proposed as a kind of human–electric hybrid bicycle integration in [ 13 ], that was supporting the bicycle driver with electric power supply only when the driver was turning the pedals. 2

Open access

.03.004 [9] Zhang H. J. , Zhang Z. Z. , Guo F. , Liu W. M. ( 2009 ), The influence of plasma treatment on the tribological properties of hybrid PTFE/cotton fabric

Open access

. Rahmat- allah Hoosmand et al. [ 19 ] TCSC Hybrid Bacterial Foraging and Nelder-Mead algorithm (BF-NM). Cost of generation, emission, and cost of TCSC minimized

Open access