模型化合物氮的热解释放及N_2转化特性研究

RELEASE OF NITROGEN IN A MODEL COAL AND N_2 FORMATION DURING PYROLYSIS

用纤维素和8-羟基喹啉在高压反应釜中合成出物理性质、化学结构及氮的官能团结构与原煤都很接近的模型化合物,利用携带流反应器实验研究了模型化合物氮在热解过程中的转化,并重点关注燃料氮向N_2的转化规律。结果表明,实验条件下模型化合物快速热解的主要气相含氮产物有三种:HCN、N_2和氮氧化物,其中N_2所占的比例最大,是模型化合物热解的主要含氮产物。温度及矿物质对N_2的生成有重要影响,实验条件下,当温度低于1000℃时,N_2的释放特性变化不大,但是当温度达到1100℃后,燃料氮向N_2的转化率显著增大。添加金属矿物质可以明显改变热解过程中燃料氮向N_2的转化特性。

A nitrogen-containing model coal has been prepared from cellulose and 8-hydroxyquinoline in a high pressure reactor. The release of nitrogen in the model coal, N2 formation and the role of additives have been investigated in an entrained-flow reactor. The results show that three gaseous nitrogen-containing products （HCN, NOx and N2） have been released from model coal during pyrolysis. N2 is the dominant product. The conversion of nitrogen in model coal to N2 changes weakly below 1000℃, while increases markedly at 1100℃. The addition of minerals to model coal can affect N2 formation, depending on temperature and the type of additives.