Fuel and Combustion

Fuel and Combustion

Investigating the effect of arrangements of air and fuel inlets on the performance of flameless combustion furnace

Document Type : Original Article

Authors
Hamed Jafari
Mohammad Zabetian Targhi
Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran
10.22034/jfnc.2024.448232.1376
Abstract
The purpose of this study is to investigate the conditions governing a flameless combustion furnace with natural gas fuel. In this article, by changing the arrangement and distances of the four symmetrical air inlets from the central fuel inlet, The concept of eddy dissipation model with coefficient correction has been used to model combustion with reduced chemical kinetics DRM22. Two symmetrical cross arrangements "X" and "+" configuration, were determined to minimize the dead space in the furnace for air inlets. Lower limit of the air and fuel inlet distance was assumed to be 12 mm and the upper limit of this distance was 36 mm in the simulation. Most of all, by examining the combustion parameters, the proposed geometry was selected for the construction of the furnace. The recirculation factor (Kv) has been increased by 2.6 times compared to the base furnace. Also, the maximum temperature has decreased by 5% and the difference between the maximum and average temperature by 77 Kelvin compared to the basic furnace, and this indicates better temperature uniformity. Also, the maximum heat of reaction of specified point in the furnace has increased by 63% compared to the base furnace and indicates the higher potential of the furnace in heat treatment. It is possible to extend results of this research to natural gas industrial furnaces.
 
Keywords
Flameless combustion
inlet configuration
temperature distribution
X and + configuration

Subjects

 
 
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