4种新疆煤无机特性及其对超细颗粒物生成的影响  

Unconventional inorganic characteristics of 4 types of Xinjiang coals and their influence on the generation of ultrafine particles

作　　者：朱京冀 曾宪鹏 喻鑫[1] 于敦喜[1] 周子健[1] 刘芳琪 吴建群 徐明厚[1] ZHU Jingji;ZENG Xianpeng;YU Xin;YU Dunxi;ZHOU Zijian;LIU Fangqi;WU Jianqun;XU Minghou(State Key Laboratory of Coal Combustion,Huahzong University of Science and Technology,Wuhan430074,China;WISDRI Engineering&Research Inc.,Ltd.,Wuhan 430074,China;JXIC Energy Tech.Research Institute Co.,Ltd.,Nanchang 330000,China)

机构地区：[1]华中科技大学煤燃烧国家重点实验室,湖北武汉430074 [2]中冶南方工程技术有限公司,湖北武汉430074 [3]江西江投能源技术研究有限公司,江西南昌330000

出　　处：《煤炭学报》2024年第5期2529-2537,共9页Journal of China Coal Society

基　　金：国家重点研发计划资助项目(2023YFB4102703);国家自然科学基金资助项目(82241088);华中科技大学第二十一批研究生创新基金资助项目(YCJJ20230361)。

摘　　要：深刻理解新疆煤的无机特性对其燃烧颗粒物生成的影响规律,对于新疆煤的清洁高效利用具有重要意义。选取五彩湾煤(WCW)、万象煤(WX)、天池煤(TC)和西黑山煤(XHS),深入研究了它们的无机特性及其与超细颗粒物生成之间的关联关系。结果表明,4种新疆煤主要为低灰、低硫褐煤;煤灰富含碱性元素,其中,Na_(2)O质量分数普遍高于常规动力煤(3.58%~7.13%),WCW和WX煤灰中CaO质量分数超过33%,但SiO_(2)和Al_(2)O_(3)质量分数较低,WX煤的高Na、高Cl特性尤为突出;煤中Na以水溶态为主(占比62.3%~90.6%),K则主要以盐酸不溶态存在,Fe以盐酸溶态和盐酸不溶态为主,而Ca、Mg在不同形态中的分布因煤种而异。新疆煤燃烧超细颗粒物组成均以Na、K、Cl、S为主,以Na_(2)O+K_(2)O+Cl+SO_(3)的质量分数高于50%为判定条件,准确界定了超细颗粒物的粒径范围。其中,WCW煤、TC煤和XHS煤的超细颗粒物具有相似的粒径范围(≤0.07μm);而水溶态Na含量最高的WX煤的超细颗粒物粒径范围更宽(≤0.76μm)。研究发现超细颗粒物的生成量y与煤中水溶态(Na+K)总量x呈高度线性正相关,关系式为y=0.528x−0.239,相关系数为0.948。A deep understanding of the effects of the inorganic characteristics of Xinjiang coals on combustion particulate generation is of great significance for their clean and efficient utilization.This work investigated the inorganic characterist-ics of Wucaiwan coal(WCW),Wanxiang coal(WX),Tianchi coal(TC),and Xiheishan coal(XHS)and the their relation-ship with the production of ultrafine particulates during combustion.The results show that the four Xinjiang coals are mainly lignites with low ash and sulfur contents.Coal ashes are enriched in basic elements.Among them,the content of Na_(2)O(3.58%-7.13%)is commonly higher than that of conventional utility coals.The ashes of WCW and WX coals have higher contents of CaO(>33%),but low contents of SiO_(2)and Al_(2)O_(3).WX coal is particularly characterized by high Na and Cl.The Na in coal is primarily water soluble(62.3%-90.6%).The K is mainly HCl insoluble.The Fe occurs primarily as HCl soluble and insoluble forms.And the distribution of Ca and Mg in different forms varies according to coal types.The composition of ultrafine particulate matter from Xinjiang coal combustion is dominated by Na,K,Cl,and S.The particle size range of the ultrafine particulate matter is accurately defined by using the condition that the mass fraction of Na_(2)O+K_(2)O+Cl+SO_(3)is higher than 50%.The ultrafine particulate matter of WCW,TC and XHS coals has similar particle size ranges(≤0.07μm);while the ultrafine particulate matter of WX coal,which has the highest content of Na in the wa-ter-soluble form,has a wider particle size range(≤0.76μm).The generation of ultrafine particulate matter(y)is found to be highly linearly and positively correlated with the total amount of water-soluble(Na+K)(x)in the coal,with the relation-ship equation y=0.528x-0.239 and the correlation coefficient of 0.948.

关 键 词：新疆煤 燃烧 超细颗粒物 碱金属 

分 类 号：TK16[动力工程及工程热物理—热能工程] X73[环境科学与工程—环境工程]