淖毛湖煤萃取分级特性研究

STUDY ON CHARACTERISTICS OF EXTRACTION FRACTION OF NAOMAOHU COAL

以淖毛湖煤为研究对象,利用高温高压萃取装置将原煤(RC)分级成残渣(RD)、不溶物(DP)和可溶物(SL)三种固体物质,考察了煤的添加量、温度、粒径和溶剂种类对DP和SL萃取率的影响,并对RC,RD,DP,SL作了工业分析、元素分析、热重分析和红外分析.结果表明:当溶剂用量一定时,随着煤的添加量增加,DP萃取率增高,SL萃取率略有降低;升高温度有利于DP和SL的萃取,当温度高于375℃时,由于发生大量热解反应,SL萃取率迅速升高;粒径对萃取率影响很小.以四氢萘和1-甲基萘为溶剂时,DP和SL总萃取率相似,均高于以甲苯为溶剂时DP和SL萃取率.RC中富含羟基的物质和脂肪烃主要集中到了DP和SL中,灰分集中到了RD中,RD,DP和SL的水分均远低于RC的水分.

Taking Naomaohu coal as research object, raw coal （RC） was divided into three solid products, which were residue （RD）, deposit （DP） and soluble （SL）, using high tem- perature and pressure extraction apparatus. The effects of the coal addition, temperature, coal particle size and solvent type on the extraction yields of SL and DP were investigated. Proximate and ultimate analysis, TG-DTG and FTIR analysis were determined. The results showed that when the dosage of solvent was certain, with the amount of coal adding, the yield of DP in- creased, the yield of SL decreased slightly; temperature increase promoted extraction of SL and DP, and at higher temperature than 375 ℃, the yield of SL increased rapidly because of large py- rolysis reaction; coal particle size had little influence on extraction; tetralin and 1-MN choosed as solvents, the total yield of SL and DP was similar, which was higher than that of toluene as sol- vent. Hydroxyl substance and aliphatic hydrocarbon contents of RC were mainly collected in SL and DP, ash content was mostly collected in RD, the moisture content of RD, DP and SL was far below that of RC.