Effect of combustion products recycling system on temperature distribution and performance of flameless combustion furnace

Document Type : Original Article

Authors

Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran

10.22034/jfnc.2024.447927.1375

Abstract

In this study, the conditions governing a flameless natural gas and air combustion furnace with an internal recirculation system equipped with an arm to increase the recirculation coefficient is numerically investigated on a laboratory scale. The effect of changing its angle on parameters of flameless combustion such as released heat, temperature distribution and internal recirculation coefficient was investigated. The simulation results show that by increasing the angle of the arm and opening the geometry up to 60 degrees, the flow is better directed into the furnace, and the volume of the recirculation area is the largest in the arrangement with an arm angle of 60 degrees. By comparing the value of the recirculation coefficient in the whole furnace, it is observed that its main effect is on the recirculation area, which leads to changes in the uniformity of temperature and released heat. By examining the maximum released heat, it can be concluded that the geometry design with an arm angle of 30 degrees is the best proposed geometry for heat treatment applications. By examining the temperature results, it was concluded that as the angle of the arm of the system is lower (the system becomes more closed) and the accumulation of the combustion flow inside it is greater, The temperature increases from 1727 K (for armless geometry) to 1738 K (for arm angle of 15 degrees).

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References

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  • Receive Date: 10 March 2024
  • Revise Date: 19 April 2024
  • Accept Date: 24 April 2024

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