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.
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, Tiers, 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.
出处
《环境科学学报》
CAS
CSCD
北大核心
2006年第11期1780-1784,共5页
Acta Scientiae Circumstantiae
基金
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)~~
关键词
超细化煤粉
脱灰煤
矿物成分
NO
micro-pulverized coal
deashed coal
mineral substance
NO
