摘要
在滴管炉(drop tube furnace,DTF)炉上对4个典型煤种进行了燃烧和制焦试验,分析煤和焦的外观形貌及灰的排放特性,研究煤质结构对可吸入颗粒级的形成机制的影响。迅速析出的挥发分在无烟煤A中易形成煤焦颗粒内部孔洞,在褐煤C、D中易产生裂缝和分裂。烟煤B在燃烧过程中煤焦破碎剧烈,褐煤D则表现出了较强的煤焦坍塌分裂能力。易汽化无机物含量的高低决定了PM1-排放量,与灰熔点一起确定了小颗粒之间的凝聚渗透能力。Mg的汽化比高,PM0.5-中含量较高;方解石的破碎能力强,但汽化比低,PM0.5-中含量低;Fe盐的破碎和汽化作用均较小,PM10中含量低且随粒径变化小。
Combustion and char making experiments of four typical coals have been carried out at a drop tube furnace(DTF) to study the influence of coal morphology to PM10formation mechanism through the analysis of coal and char morphology and PM10 emission character. Sharp release of volatile can form inner holes of particles to anthracite A, while producing fractures or spliting particles to lignite C and D. Bituminous B shows sharp char fragmentation during combustion, while lignite D also has high ability of disintegration. The content of gasify mineral determines the emission of PM1- and together with ash melting point determine the ability of percolation between fine particles. The vaporization ratio of Mg is high and it exists in PM0.5- in large amounts; The calcite is fragile but its vaporization ratio is very low and it almost does not exist in PM0.5-; For the molysite, its ability of fragmentation and vaporization are both small, so Fe content is low in PM10 and varies slightly with particle size.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2013年第S1期117-121,共5页
Proceedings of the CSEE
关键词
煤质结构
焦
可吸入颗粒物
机制
coal morphology
char
inspirable particle
mechanism
