油页岩半焦燃烧特性试验研究

Experimental study on combustion characteristics of oil shale semi-coke

利用管式炉对来自桦甸、龙口和依兰的油页岩进行450～600℃干馏处理,并运用热重分析仪（TGA）在30℃/min的升温速率条件下对油页岩半焦进行测试,考察了干馏温度、干馏时间和油页岩产地对油页岩半焦的组成、发热量和燃烧性能的影响,并计算了各样品的燃烧特性指数。结果表明：干馏前后发热量不一定会产生明显降低,依兰半焦的发热量与油页岩相比基本不变。干馏温度越高,半焦挥发分明显降低,停留时间对半焦成分和燃烧特性的影响也越小。随着干馏程度的升高,着火温度Ti增大,燃烧性能变差,燃尽温度基本不变。样品重量一般在350℃左右开始明显减小,在500℃左右质量变化速率逐渐减小,在700℃再次产生明显失重。从页岩油的产率和半焦的燃烧特性角度综合考虑,过长的干馏时间经济性变差。

The aim of this project is to study the combustion characteristics of oil shale semi-coke. The oil shale samples from Huadian,Longkou and Yilan were pyrolyzed in a tube furnace at the temperature between 450 ℃ and600 ℃,then the semi-coke samples were analysed by thermogravimetric analyser at the heating rate of 30 ℃ / min. The influence of pyrolysis temperature and pyrolysis time on composition and calorific value were investigated. The results show that a longer pyrolysis time has no obvious effect on composition and calorific value especially at higher temperature. After pyrolysis,the ash content increases while the volatile content deceases,and the calorific value changes differently according to the origin. Higher temperature makes the ignite point Tiincrease and the combustion characteristics of semi-coke become worse. The mass loss starts at 350 ℃,and decreases at 500 ℃,and there is an increase at700 ℃.