印尼褐煤无黏结剂型煤自燃与燃烧特性研究

STUDY ON SPONTANEOUS COMBUSTION AND COMBUSTION CHARECTERISTICS OF BINDERLESS BRIQUETTE FROM AN INDONESIAN LOW RANK COAL

在内辊式高压型煤机上将一种印度尼西亚褐煤压制成高强度的无黏结剂型煤,对其比表面积、孔容积和表面官能团进行分析,测定了型煤的相对着火温度和绝热氧化升温速率,研究了其热解和燃烧行为特性.结果表明,印尼褐煤在干燥和高压成型过程中,发生了孔的收缩和崩塌,特别是微孔收缩程度要更大一些;干燥和成型过程中有羟基、羰基和羧基含氧官能团的分解;经过提质处理后,褐煤的自燃着火倾向降低,热解和燃烧反应性降低.

An Indonesian low rank coal was compressed into high strength binderless briquettes in a double roller briquetting machine. The BET surface, pore volume and surface functional group of raw coal and briquette coal were analyzed and compared. The briquette＇s relative ignition temperature and adiabatic oxidation heating rate were measured. The pyrolysis and combustion characteristics have been studied. The results showed that the collapse of pores in coal, leading to coal shrinkage, took place while hydroxyl, carbonyl and carboxyl groups decomposed during drying and high pressure binderless briquetting. The upgraded coal had lower spontaneous combustion propensity, and its reactivity during pyrolysis and combustion decreased.