Gas/particle flow and combustion characteristics and NOx emissions of a new swirl coal burner

Effect of Co-firing PKS and Coal on Flame Structure in a Pulverized Coal Swirl Burner

“…특히, 대향류 연소로 에서는 Low-NOx 버너를 이용하여 독립적인 화염의 제어가 가능하며, 이를 통해 질소산화물을 저감시키 고 연소효율을 향상시킨다 [7][8][9]. 미분탄 버너에서 질 소산화물의 저감 원리는 석탄입자를 특정영역에 집 중시키거나 내부재순환영역(IRZ, Internal Recirculation Zone)을 형성하여 공기비가 낮은 상태에서 체류 시간을 증가시키는 것으로, 연소 과정에서 생성되는 중간생성물과 질소산화물의 환원반응을 통하여 NOx 를 저감시킨다 [10,11].…”

“…미분탄 버너에서 질 소산화물의 저감 원리는 석탄입자를 특정영역에 집 중시키거나 내부재순환영역(IRZ, Internal Recirculation Zone)을 형성하여 공기비가 낮은 상태에서 체류 시간을 증가시키는 것으로, 연소 과정에서 생성되는 중간생성물과 질소산화물의 환원반응을 통하여 NOx 를 저감시킨다 [10,11]. 따라서 많은 연구에서 IRZ와 질소산화물의 배출특성을 분석하였고, IRZ의 거동은 스월강도에 크게 의존하는 것을 확인하였다 [8,9,12,13].…”

Numerical investigation of gas-particle flow in the primary air pipe of a low NOx swirl burner – The DEM-CFD method

“…In recent decades, most of the newly built power plants are designed, and the existing ones are retrofitted, to decrease pollutant emissions. Accordingly, to reduce NO x emissions and improve boiler efficiency, various types of swirl burners (HT-NR3, DRB-4Z, CFR, LNASB, et al) have been designed and adopted (Chen, Li, Zhu, & Jing, 2011;Li et al, 2012;Ochi, Kiyama, Yoshizako, Okazaki, & Taniguchi, 2009).…”

“…Low NO x emission and complete combustion can be realized by organizing a reasonable flow field structure. Much work has been conducted to investigate the gas-particle two-phase flow of several swirl burners using a three-dimensional phase Doppler anemometer (PDA) (Chen et al, 2011;Li et al, 2003Li et al, , 2012, and it is believed that the characteristics of the flame can be analyzed and predicted by examining the aerodynamic and particle dispersion characteristics of swirl burners. The influences of particle motion and swirling flow on NO x emissions were numerically simulated by Gu, Zhang, Fan, Wang, and Tian (2005), and their results indicated that the minimum NO x emission occurred when the average particle residence time in the internal recirculation zone reached its maximum value.…”

Numerical Simulation Study of the Influence of Flue Gases Recirculated on NOx Emissions

“…Combustion processes are typically considered as ones of the main factors responsible for the emission to the atmosphere of important air pollutants, such as NO x , SO 2 and particulate matter. NO x is produced during the combustion process in a high temperature region and is known as a source of major air pollution that generates ozone when it reacts with sunlight; NO x also causes respiratory diseases [1][2][3] . Flue gas recirculation (FGR) is an interesting technique for reduction of nitrogen oxide (NO x ) emissions that can be applied to boilers or internal combustion engines.…”