准东煤灰沉积特性的实验研究  

Experimental Study on Ash Deposition Characteristics of Zhundong Coal

作　　者：李君杰[1] 熊彪[1] 张泰[1] 黄晓宏[1] 卢科[1] 柳朝晖[1] 郑楚光[1] LI Jun-Jie XIONG Biao ZHANG Tai HUANG Xiao-Hong LU Kc LIU Zhao-Hui ZHENG Chu-Guang(State key Laboratory of＂ Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074 Chin)

机构地区：[1]华中科技大学煤燃烧国家重点实验室,武汉430074

出　　处：《工程热物理学报》2017年第8期1790-1794,共5页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.51506065);国家科技支撑计划项目(No.2015BAA04B02)

摘　　要：本文在高温沉降炉(DTF)上开展了准东煤及其混煤在20%O_2/80%N_2气氛下的灰沉积实验。可控温灰沉积取样枪从沉降炉底部伸入炉膛进行沉积取样。利用XRF、XRD和SEM-EDS对收集到的总灰和沉积样片进行表征。研究结果表明:混煤总灰中含有较多石英、莫来石等难熔物,较少CaO、CaSO_4等助熔矿物,这有利于灰熔点的升高,从而降低了准东煤沉积倾向。准东煤900℃沉积可以分为内外两层。在内层观察到Na_2SO_4和CaSO_4的富集。内层主要由为1~10μm小颗粒构成,外层主要由20~50μm大颗粒构成。1150℃沉积无分层现象,主要以Ca、Mg、S沉积为主。900℃下准东煤沉积倾向更严重。The experiments of Zhundong coal and its blended coal in 20%O2/80%N2 atmosphere in this paper were carried out in a drop tube fllrnace （DTF）. A temperature-controlled ash deposition probe was inserted from te bottom of the furnace to sainple. Total ash aild deposits were charac- terized by XRF, XRD and SEM-EDS. The total ash of the blended coal contained more refl＇actory quartz and mullite and less fluxing nfinerals like CaO and CaSO4. It increased the ash fusion poim and alleviated deposition tendency of Zhundong coal. Deposits of Zhundong coal sampled in 900℃ could be divided into an inner layer and an outter layer. The enrichment of Na2SOI and CaSOI was observed in the inner layer. The inner layer was mainly composed of smaller particles of 1-10） [tin, the outer layer was mainly composed of larger particles of 20-50 μm. The similar phenomenoll wasn＇t observed in 1150℃ and Deposits were mainly composed of Ca, Mg and S. In 900℃, deposition tendency of Zhundong coal was more serious.

关 键 词：准东煤 灰沉积 矿物 

分 类 号：TK16[动力工程及工程热物理—热能工程]