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research-article

Investigating the Effect of Fuel Rate Variation in an Industrial Thermal Cracking Furnace with Alternative Arrangement of Wall Burners using CFD Simulation

[+] Author and Article Information
Hossein Mohamad Ghasemi

Faculty of Caspian, College of Engineering, University of Tehran, P.O. Box 43841-119, Rezvanshahr 43861-56387, Iran
Hosseinmgh_chemeng@yahoo.com

Neda Gilani

Fouman Faculty of Engineering, College of Engineering, University of Tehran, P.O. Box 43515-1155, Fouman 43516-66456, Iran
gilani@ut.ac.ir

Jafar Towfighi Daryan

Faculty of Chemical Engineering, Tarbiat Modares University, P.O. Box 14115-143, Tehran, Iran
towfighi@modares.ac.ir

1Corresponding author.

ASME doi:10.1115/1.4036801 History: Received August 31, 2016; Revised May 14, 2017

Abstract

A new arrangement of side-wall burners of an industrial furnace was studied by three dimensional-CFD simulation. This simulation was conducted on ten calculation domain. Finite rate/eddy dissipation model was used as a combustion model. Discrete Ordinate Model was considered as radiation model. Furthermore, weighted sum of gray gas model was used to calculate radiative gas properties. Tube skin temperature and heat flux profiles were obtained by solving mass, momentum and energy equations. Moreover, fuel rate variation was considered as an effective parameter. A base flow rate of fuel (m ?=0.0695 kg/s) was assigned and different ratios (0.25m ?, 0.5m ?, 2m ?, 4m ?) were assigned to investigate heat distribution over the furnace. Resulted temperature and heat profiles were obtained in non-uniform mode by proposed wall burner arrangement. According to the results, despite increased heat transfer coefficient about 34% for m ? to 4m ?, temperature profile for this rate is too high and is harmful for tube metallurgy. Also proper range for fuel rate variation was determined 0.5m ? to 2m ?. In this range, heat transfer coefficient and Nusselt number for m ? to 2m ? were increased by 21% and for m ? to 0.25m ? were decreased about 28%.

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