蒙古Mogoin金矿床煤的热分解及富集品质研究

D. Batkhishig, E. Shagjjav, S. Batbileg, A. Ankhtuya, B. Purevsuren
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摘要

本研究的主要目的是研究Mogoin金煤的热稳定性和热分解机理,热解和热裂解液化的可能性,重液富集降低煤的矿物含量,提高煤的质量的可能性。为此,对Mogoin金煤进行了近似分析和极限分析、热重分析,并对其热分解(热裂解和热解)进行了研究。采用日本日立TG/DTA7300热重仪进行热重分析,在200 ~ 700℃不同加热温度下,以20℃/min等速加热80 min,进行热解研究。根据近似分析和元素分析结果,表明Mogoin金煤为高阶炼焦煤。采用SNOL炉对Mogoin金煤在不同加热温度下的热解过程进行了研究,热解产物为硬渣、焦油、热解水和气体。热解温度为700℃时,热解焦油收率最高,为6.28%。在350 ~ 450℃的空气密闭高压釜中,采用不同煤与溶剂质量比(1:1.75;1:1.5)。在450℃的热解实验中,当煤与溶剂的比为1:1 .5时,液相产物得率最高。
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Study on thermal decomposition and enrichment quality of coal from Mogoin gol deposit in Mongolia
The main purpose of this study is to investigate the thermal stability and the mechanism of thermal decomposition of Mogoin gol coal, the possibility of liquefaction by pyrolysis and thermolysis, and the possibility of enriching by heavy liquids to reduce the mineral content of coal and improve its quality. Under this purpose, the Mogoin gol coal was characterized by proximate and ultimate analysis, thermogravimetry, and investigated its thermal decomposition (thermolysis and pyrolysis). Thermogravimetric analysis was performed using Japanese HITACHI TG/DTA7300 instrument and pyrolysis investigation was carried out at different heating temperatures 200–700 °C with constant heating rate 20 °C/min for 80 min. On the basis of proximate and elemental analysis results, it has been indicated that the Mogoin gol coal is high-rank coking coal. The pyrolysis of Mogoin gol coal was studied by SNOL furnace at different heating temperatures and obtained from pyrolysis products such as hard residue, tar, pyrolytic water, and gas. From pyrolysis, the yield of pyrolysis tar (6.28 %) was highest at 700 °C. The experiment of thermal decomposition (thermolysis) was carried out in air closed autoclave at 350–450 °C and using hydrogen donor solvent (tetraline) with different mass ratios of coal and solvent (1:1.75; 1:1.5). In the thermolysis experiment, the yield of liquid product is highest with the coal-solvent ratio of 1: 1.5 at 450 °C.
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