CAJ | 학술논문

采用管式炉研究了煤粉粒径对可吸入颗粒物排放特性的影响.试验煤种为徐州烟煤,煤粉粒径分别为135～220 μm,91～135 μm,61～91 μm和0～61 μm;燃烧试验在1 123 K,O_2/CO_2气氛下进行.试验用荷电低压撞击器(ELPI)采集燃烧后的可吸入颗粒物.结果显示:煤粉粒径是燃烧过程中影响PM_(2.5) (2.5 μm以下颗粒物)生成的重要因素,粒径越小,生成的PM_(2.5)越多;4种粒径煤粉燃烧后生成的PM_(2.5)粒径分布都是相似的双峰分布,峰值点分别出现在0.2和2.5 μm左右.随着煤粉粒径的减小,S,Na和K几种元素的浓度值增加很大,Ca和Si的浓度值减少很多,而Fe的浓度值变化不大.粒径小于0.317 μm的颗粒可能通过气化-凝结机理形成,超微米颗粒则可能是通过亚微米颗粒凝聚、聚结和矿物质熔融、破碎、聚结形成.
채용관식로연구료매분립경대가흡입과립물배방특성적영향.시험매충위서주연매,매분립경분별위135～220 μm,91～135 μm,61～91 μm화0～61 μm;연소시험재1 123 K,O_2/CO_2기분하진행.시험용하전저압당격기(ELPI)채집연소후적가흡입과립물.결과현시:매분립경시연소과정중영향PM_(2.5) (2.5 μm이하과립물)생성적중요인소,립경월소,생성적PM_(2.5)월다;4충립경매분연소후생성적PM_(2.5)립경분포도시상사적쌍봉분포,봉치점분별출현재0.2화2.5 μm좌우.수착매분립경적감소,S,Na화K궤충원소적농도치증가흔대,Ca화Si적농도치감소흔다,이Fe적농도치변화불대.립경소우0.317 μm적과립가능통과기화-응결궤리형성,초미미과립칙가능시통과아미미과립응취、취결화광물질용융、파쇄、취결형성.
The influence of coal granule size on the emission characteristics of inhalable particles was studied with a tube furnace. Xuzhou bituminous coal was used, grouped in four size ranges: 135 -220 μm, 91 - 135 μm, 61-91 μm and 0-61 μm. The combustion tests were carried out at 1 123 K under O_2/CO_2 conditions. The inhalable particulates after combustion were collected into an electrical low pressure-impactor ( ELPI) . Results indicate that the coal granule's size is an important factor for the formation of PM_(2.5)(particulates with diameters less than 2. 5μm) during combustion. The smaller the coal granule size is, the more PM_(2.5)is formed. The size distributions of PM_(2.5) formed after combustion of coal granule with different size are similar, displaying two peaks around 0. 2 μm and 2. 5 μm respectively. With decreasing of coal granule size, the concentrations of S, Na, and K increase rapidly; Ca and Si decrease strikingly and Fe changes a little. The ash particles smaller than 0. 317μm may form via the mechanism of vaporization and condensation, and the supermicron-size ash particles may form by coagulation and coalescence of the submicron-size ash, and fragmentation and coalescence of mineral matter.