2种单煤混合粉磨对煤粉矿物分布影响规律研究  

Study on the influence of mixed pulverization of two single coals on the mineral distribution in coal blends

作　　者：吴锁贞[1] 王庆松 程健林 高通 杨云飞 张洪[2] WU Suozhen;WANG Qingsong;CHENG Jianlin;GAO Tong;YANG Yunfei;ZHANG Hong(Jiangsu Fangtian Electric Power Technology Co.,Ltd.,Nanjing 211100,China;School of Chemical Engineering,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]江苏方天电力技术有限公司,江苏南京211100 [2]中国矿业大学化工学院,江苏徐州221116

出　　处：《洁净煤技术》2021年第3期147-152,共6页Clean Coal Technology

基　　金：国家自然科学基金-山西低碳基金联合基金资助项目(U1510106);国家电网方天公司科技项目(SGTYHT/18-JS-206)。

摘　　要：煤中矿物质分布规律直接影响锅炉结渣和超细颗粒物形成,研究了2种单煤混合粉磨对煤粉中矿物质分布影响规律。将准东原煤和晋城原煤分别破碎到3 mm以下,按照质量比70∶30、50∶50、30∶70混合粉磨至150 mm以下,对各煤粉样品进行浮沉分离,研究密度组成、工业分析组成、显微组成和煤灰化学组成变化。结果发现,2种单煤混合粉磨过程中互相影响强烈,混煤煤粉密度分布和2种单煤加权平均相比发生明显分化。混合粉磨使混煤中<1.5 g/cm^(3)和>1.7 g/cm^(3)组分占比下降,而1.5~1.6 g/cm^(3)组分大幅上升;根据各密度级别煤粉挥发分和显微镜观察发现,晋城煤富集于混煤煤粉<1.5 g/cm^(3)组分中,而准东粉主要富集在1.6~1.7 g/cm^(3)组分中;相比2种单煤煤粉,不同密度级别混煤煤灰化学组成分布更均匀。2种单煤易磨性不同是混煤煤粉组成发生偏析的根本原因。The mineral distribution in pulverized coal directly affects the fouling and slagging of furnace and the formation of particulate matter.In this paper,the influence of mixed pulverization of two single coals on mineral distribution in coal blends was studied.Zhundong raw coal and Jincheng raw coals were crushed to below 3 mm,respectively,mixed and ground to less than 150μm according to the mass ratio of 70∶30,50∶50,30∶70.The float-sink method with organic solutions was used to separate the pulverized raw coals and coal blends into different density fractions.The changes in density fraction,volatile matter content,maceral composition and chemical composition of coal ash were studied.It is found that the two single coals have strong interaction during mixed pulverization.The density composition of the coal blends is obviously different from the averaged ones of the two single pulverized coals.The density fractions,<1.5 g/cm^(3) and>1.7 g/cm^(3),in the three blended coals decrease,while the 1.5-1.6 g/cm^(3) fraction significantly increases during mixed pulverization.Both volatile matter contents and microscopic observations indicate that Jincheng coal is concentrated in the<1.5 g/cm^(3)fraction of the coal blends,and Zhundong coal is mainly concentrated in the 1.6-1.7 g/cm^(3) fraction.The chemical compositions of the blend coal ashes are more uniform in different density grades compared with the two kinds of single coals.Mechanism analysis indicates that the different grindability of the two kinds of single coal is the fundamental reason for the segregation of pulverized coal composition.

关 键 词：混煤 密度分离 显微观察 煤灰化学组成 

分 类 号：TQ533[化学工程—煤化学工程]