Nitric oxide emission reduction and thermal characteristics of fuel-pulsed oscillating combustion in an industrial burner system

Byunghwa Jang, Changyong Oh, Sungsu Ahn, Yeongkyun Kim, Jonghyun Park, Minsung Choi and Yonmo Sung

Energy, 2021, vol. 216, issue C

Abstract: An experimental study was conducted on the effects of non-oscillating and oscillating combustions on nitric oxide (NO)-emission reduction and heat-transfer enhancement in an industrial low-NOx burner for reheating furnaces. Natural gas was periodically supplied by an oscillating control valve equipped with a rotary-type disk generating an oscillating fuel flow inside the furnace. The furnace temperatures and gas-species concentrations were measured for non-oscillating and oscillating combustions with the oscillating-frequency and duty ratio in the ranges of 1–5 Hz and 10–40%, respectively. The flame sizes in oscillating combustion increased (decreased) under a fuel-rich (fuel-lean) combustion condition, corresponding to the oscillating fuel-flow rates. The NO-reduction efficiency of the oscillating combustion increased as the oscillating frequency (Hz) decreased and as the duty ratio (%) increased in contrast to the non-oscillating combustion. The maximum NO reduction was ∼32% under the 1 Hz/40% oscillating combustion. Although the peak temperature was lower in the oscillating combustion than in the non-oscillating combustion, the overall temperature distribution in the oscillating condition was higher than that in the non-oscillating combustion. Thus, the oscillating combustion improved the furnace-heating performance by ∼9.8%. Consequently, it effectively facilitated NO-emission reduction and heat-transfer enhancement simultaneously.

Keywords: Oscillating combustion; Pulse combustion; Thermal efficiency; NOx reduction; Low-NOx burner; Reheating furnace (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:216:y:2021:i:c:s0360544220323707

DOI: 10.1016/j.energy.2020.119263

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