超临界水条件下颗粒和催化剂对褐煤液化作用的实验研究

摘要

In order to study the possibility of lignite liquefaction and gaslization in SCW ( supercritical water ) and its influencing factors, lignite liquefaction experiments were carried out under the conditions of different catalysts , temperature and particle size of coal samples.The results show that a certain amount of oil could be produced when lignite was liquefacted in the state of SCW when the temperature reached super point , the reaction of liquefaction speed up significantly , and the conversion rate goes up from 15.84%to 94.64%and output of oil was only 3.36 ml, 2.69 g.The conversion rate is 12.78%.Catalyst KOH made the conversion rate of lignite into gases or liquids reach the highest level of 94.64%.But the oil transforming rate of lignite was as low as 12.78%.When lignite particle size at 0.9~2.0 mm with catalyst K2CO3, the oil produced was 8.01ml, 6.41g, and the conversion rate was 30.48%.The bigger coal sample particle is , the smaller the conversion rate is and higher oil yield is.So un-der the state of supercritical water , the lignite particle size at 0.9~2.0 mm with catalyst K2 CO3 is the best way to convert lignite into oils.%通过应用“控制变量法”对温度、催化剂及煤样粒径对褐煤液化的影响进行了实验研究。结果表明，当温度达到超临界点时，褐煤气液化反应明显加快，其转化率由15.84％（亚临界水）升至94.64％；催化剂KOH使褐煤转化率达到最高，为94.64％，但转化成液态油仅为3.36 ml，约2.69 g，液体转化率为12.78％。，在同等煤粒径（0.9～2.0 mm）条件下，催化剂K2 CO3更有利于褐煤液化成油类物质，产生油量8.01 ml，约6.41 g，液体转化率为30.48％；煤样粒径越小，褐煤转化率越高，但小粒径褐煤主要向气体转化，而大粒径褐煤主要向液体转化。因此，在超临界状态下采用同等粒径（0.9～2.0 mm）的煤样并添加催化剂K2 CO3对褐煤转化成油类物质效果最佳。