• 关键词：超细化煤粉  脱灰煤  矿物成分  NO

• 基金项目：国家高技术研究发展计划基金项目(No.2002AA527051);辽宁省教育厅A类计划项目(No.2004D079)

• 魏砾宏
• 1. 哈尔滨工业大学能源科学与工程学院, 哈尔滨 150001; 2. 沈阳航空工业学院清洁能源与环境工程研究所, 沈阳 110034

• 姜秀民
• 上海交通大学机械与动力工程学院, 上海 200240

• 杨天华
• 沈阳航空工业学院清洁能源与环境工程研究所, 沈阳 110034

• 李延吉
• 沈阳航空工业学院清洁能源与环境工程研究所, 沈阳 110034

• 王雷
• 沈阳航空工业学院清洁能源与环境工程研究所, 沈阳 110034

• 摘要：选用超细化鹤岗、铁法、准葛尔3种脱灰煤(HCl/HF脱灰),分别添加NaOH、MgO、CaO、Al₂O₃和Fe₂O₃矿物成分制成试验样品.采用DTG(热重/差热连用仪)和GCMS(气相色谱质谱连用仪)对不同样品进行燃烧实验,设定气体流量为50mL·min^-1,氧气体积分数为20%,升温速率为20℃·min^-1,研究矿物成分对煤粉燃烧时氮转化的影响.结果发现,经脱灰处理的超细化煤粉在氧气体积分数为20%时燃烧过程中NO的释放曲线是单峰曲线;NaOH、Al₂O₃对NO的还原反应均表现出不同程度的催化作用,NaOH的催化能力最强;Fe₂O₃、CaO和MgO对还原反应有催化或抑制作用,其作用的类别和大小与煤的种类和矿物质的含量有关,超细化可促进NO的还原.

• Abstract：In this paper, firstly, each of five kinds of mineral substances (NaOH, MgO, CaO, Al₂O₃ and Fe₂O₃) was mixed into three kinds of deashed micro-pulverized coals (obtained from Hegang, Tiefa, Zhungeer) to make experimental samples for the combustion experiments, respectively. Then, using an online thermogravimetric-gas chromatographic system, the combustion experiments of these samples were conducted at the heating rate of 20 ℃·min^-1 and the reactive gas flow of 50mL·min^-1 where the O₂ molar concentration was 20%. On the basis of the experimental results, the effect of mineral substances on the nitrogen conversion of micro-pulverized coals was analyzed. There only existed a peak in the NO emission curve obtained from the combustion of the micro-pulverized coals. Among these mineral substances, NaOH has the strongest catalytic effect on the reduction reaction of NO. In particular, in this experiment these micro-pulverized coals showed a strong catalytic effect on the reduction reaction as a result of particle size.

• Key words：micro-pulverized coal  deashed coal  mineral substance  NO

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