미분탄 스월버너에서 석탄/바이오매스 혼소시 바이오매스 입자 크기가 화염구조 및 연소특성에 미치는 영향

Abstract

The flame structure and combustion characteristics of co-firing coal and LPG with different sizes of biomass were investigated in a dual swirl pulverized coal burner by using a high-speed camera with bandpass filter and PIV system. Three sizes of spent mushroom compost (<45, 45~90, 90~150 ㎛) were cofired with pulverized coal (45~90 ㎛) at a blending ratio of 20%. When the biomass of the same size with coal was used, the turbulence intensity had the highest uniformity while other cases exhibited locally strong turbulent intensity. The combustion using <45 ㎛ biomass was terminated early compared to other conditions, whereas the reaction region was the widest for 45~90 ㎛ biomass. The flame had uniform turbulent intensity with wide and strong reaction when the biomass size was equal to that of coal. When using 45~90 ㎛ of biomass, high velocity was maintained in the overall region and CH<SUP>*</SUP> radical was observed in a wide region with the highest radical intensity.