摘要
利用傅里叶红外气体分析设备,在自制的固定床反应器上对能够显著影响再燃煤还原气体生成特性的因素进行了实验研究.结果表明,神木煤在N2和CO2气氛下受热生成的还原气体主要有CO、CH4和HCN4.CO2气氛有利于原料煤中的C更多地转化为CO,CH4在N2和CO2气氛下的生成特性及产率相近.O2对神木煤的CO、CH4及HCN的生成特性影响很大,氧的存在降低了CO开始形成的温度及产率,也降低了CH4的生成温度和产率.O2使得HCN开始生成的温度大幅度降低,当w(O2)为6%时HCN的产率明显增加,同时O2的存在还增加了NO的产率.无论是在N2气氛还是在CO2气氛下,快速升温时CH4的产率均高于程序升温时的值,但CO的产率均小于程序升温时的值.升温速率对HCN的影响与煤种有关,除TC煤外,快速升温时HCN的产率均比程序升温时低.
On a self-designed fixed bed reactor the factors influencing the formation of reducing volatiles from the coals for reburning are investigated with a Gasmet fourier transform infrared spectroscopy analyzer. The experimental results show that reducing volatiles, such as CO, CH4 and HCN, can be found during the heating process of Shenmu coal in N2 and CO2 atmosphere, CO2 atmosphere gets better for the generation of CO. The generation of CH4 in N2 is similar to that in CO2. The presence of O2 in the atmosphere exerts on obvious influence on the formation of CO, CH4 and HCN, as well as the emission of NO. O2 decreases the initial formation temperature of CO and CH4 and their productive rates, while it increases the productive rate of NO. The initial formation temperature of HCN is greatly decreased in the presence of O2 while the productive rate of HCN is increased remarkably in O2 of 6 %. The heating rate affects the formation of reducing volatiles. No matter in N2 or in CO2, the yield of CH4 during rapid heating process is greater than that during temperature-programmed heating process, while the yield of CO is reversed. The effect of heating rate on HCN generation depends on coal types. Except TC coal, the yield of HCN during rapid heating process in N2 or in CO2 is lower than that during temperatureprogrammed heating process.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2008年第9期1061-1064,1126,共5页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(50576071
50676076)
