The Effect of Mixing Recirculated Flue Gas with Primary or Secondary Air during Biomass Combustion in Grate-Firing Boiler as the Primary Measure for NOx Reduction

IF 0.6 4区 工程技术 Q4 MECHANICS Mechanika Pub Date : 2022-12-05 DOI:10.5755/j02.mech.31475
Giedrius Jomantas, K. Buinevičius
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Abstract

Due to the pollutant regulations of the Directive (EU) 2015/2193, the need to reduce the emissions of pollutant compounds such as NOx is of a great importance for industrial boilers. This study was performed to determine the effect of primary measures in reducing said pollutants by mixing primary or secondary air with FGR and supplying the mixture for combustion. The studies were conducted on low-scale industrial biomass grate-firing furnace and boiler stand of 25 kW. Sunflower husk pellets, shredded pine bark and wood pellets were combusted during these experiments and emissions of NOx in their combustion products were analyzed. The most significant reduction of emissions was achieved by mixing primary air and FGR and supplying it to the primary combustion zone – under the grate. The emissions of NOx were reduced by 29% and 15% for shredded pine bark and sunflower husk pellets respectively. The emissions of shredded pine bark were reduced enough to meet the standards of the EU Directive, unlike those of sunflower husk pellets. The possible ways to reach greater reduction of NOx by using primary measures are implementing staged combustion, supplying pure FGR and/or mixing agriculture waste with fuels containing less N in its composition.
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炉排锅炉生物质燃烧过程中再循环烟气与一次或二次风混合作为NOx减排主要措施的效果
由于指令(EU)2015/2193的污染物法规,减少NOx等污染物化合物的排放对工业锅炉来说非常重要。进行这项研究是为了确定通过将一次或二次空气与FGR混合并提供混合物用于燃烧来减少所述污染物的主要措施的效果。在小型工业生物质炉排燃烧炉和25kW锅炉台上进行了试验研究。在试验过程中,对葵花皮颗粒、松皮碎和木屑颗粒进行了燃烧,并对其燃烧产物中的NOx排放进行了分析。通过混合一次空气和FGR并将其供应到炉排下的一次燃烧区,实现了最显著的减排。松皮碎颗粒和向日葵壳颗粒的NOx排放量分别减少了29%和15%。松皮碎片的排放量减少到足以满足欧盟指令的标准,这与向日葵壳颗粒不同。通过使用主要措施实现更大程度减少NOx的可能方法是实施分级燃烧、提供纯FGR和/或将农业废物与成分中含氮较少的燃料混合。
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来源期刊
Mechanika
Mechanika 物理-力学
CiteScore
1.30
自引率
0.00%
发文量
50
审稿时长
3 months
期刊介绍: The journal is publishing scientific papers dealing with the following problems: Mechanics of Solid Bodies; Mechanics of Fluids and Gases; Dynamics of Mechanical Systems; Design and Optimization of Mechanical Systems; Mechanical Technologies.
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