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

Influencing factors and laws of lignite gasification in supercritical water

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3．36ml，约2．69g，液体转化率为12．78％。在同等煤粒径（0．9—2．0mm）条件下，催化剂K2CO3更有利于褐煤液化成油类物质，产生油量8．01ml，约6．41g，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（0．9～2．0mm）的煤样并添加催化剂K2CO3对褐煤转化成油类物质效果最佳。

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 3.36ml, 2. 69g. 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 under the state of supereritieal water, the lignite particle size at 0. 9 - 2. 0 mm with catalyst K2CO3is the best way to convert lignite into oils.