Effects of alkali-oxygen oxidation temperature on the structures and combustion properties of Shengli lignite

被引：21

作者：

Wang, Dandan ^{[1
]}

He, Runxia ^{[1
]}

Wang, Bin ^{[1
]}

Zhou, Huacong ^{[1
]}

Song, Yinmin ^{[1
]}

Zhi, Keduan ^{[1
]}

Chen, Jiaming ^{[1
]}

Li, Na ^{[1
]}

Ban, Yanpeng ^{[1
]}

Liu, Quansheng ^{[1
]}

机构：

[1] Inner Mongolia Univ Technol, Coll Chem Engn, Inner Mongolia Key Lab High Value Funct Utilizat, Hohhot 010051, Inner Mongolia, Peoples R China

来源：

RSC ADVANCES | 2017年 / 7卷 / 32期

基金：

中国国家自然科学基金;

关键词：

BENZENE POLYCARBOXYLIC ACIDS; RAY PHOTOELECTRON-SPECTROSCOPY; LOW-RANK COALS; BROWN-COAL; STEAM GASIFICATION; RAMAN-SPECTROSCOPY; CARBONACEOUS MATERIALS; BITUMINOUS COAL; MINERAL MATTER; XRD ANALYSIS;

D O I：

10.1039/c7ra01169e

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Spontaneous combustion has become a critical limiting factor for the safe and efficient utilization of low rank coals. In this work, the alkali-oxygen oxidation (AOO) of Chinese Shengli lignite was conducted to inhibit the spontaneous combustion tendency, and the influences of AOO on the structures and combustion properties were investigated. The structures of AOO treated lignite under different conditions were characterized by XRD, Raman, XPS and FTIR. The combustion characteristics of the samples were investigated by thermogravimetric analysis and fixed bed combustion. The results revealed that the temperature of AOO treatment had significant influence on the crystallite structures and combustion characteristics of Shengli lignite. After the AOO pretreatment, the benzene ring skeleton structures in lignite had no obvious changes, but the amounts of aliphatic side chains on the aromatic nucleus decreased. Compared with raw lignite, the degree of order and ignition temperature increased after AOO treatment, especially when the AOO temperature was 150-200 degrees C. The ignition temperatures moved from 310 degrees C for raw lignite to 740-760 degrees C for the samples treated by AOO at 150-200 degrees C. On further increasing the AOO temperatures to 250-300 degrees C, the ignition temperature of the samples decreased to 410-440 degrees C. In conclusion, AOO pretreatment under suitable conditions is an efficient way to inhibit the spontaneous combustion tendency of low rank lignite, and it is believed that the results in this work are meaningful for the safe transportation and efficient utilization process of lignite in industry.

引用

页码：19833 / 19840

页数：8

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