煤慢速升温热解过程中冠醚对硫脱除率的影响

在固定床反应器中研究了团柏煤中硫在氮气气氛下随温度、停留时间的变迁规律,并考察了煤慢速升温热解过程中添加18-冠-6或二苯并-18-冠-6对硫脱除率的影响。结果表明:在煤热解过程中添加18-冠-6或二苯并-18-冠-6都有利于总硫的脱除;当热解温度大于550℃时,相同条件下添加二苯并-18-冠-6时总硫的脱除效果明显优于添加18-冠-6;在煤热解过程中,添加二苯并-18-冠-6也可提高有机硫的脱除率;当热解温度小于650℃时,添加18-冠-6或二苯并-18-冠-6,同时可明显提高黄铁矿硫的脱除率。通过对热解半焦进步的脱附实验和孔结构分析,发现在原煤热解过程中,添加18-冠-6或二苯并-18-冠-6,可以使半焦平均孔径变大。

Impact of Crown Ether on the Sulfur Removal Rate During the Course of Slow-heating Pyrolysis of Coal

The transformation behavior of sulfur in Tuanbo （TB） coal during the course of slow-heating pyrolysis at dif- ferent temperatures and residence times was investigated in the fixed-bed system in inert atmosphere. Besides, the impact of 18-crown-6 or dibenzo-18-crown-6 on the desulfuration rate during the course of slow-heating pyrolysis of coal was also studied. The results indicated that adding 18-crown-6 or dibenzo-18-crown-6 could improve the total sulfur removal rate during Tuanbo coal pyrolysis; and when the temperature was higher than 550 ~C, adding dibenzo-18-6 was more efficient. Furthermore, The results also showed that adding dibenzo-18-crown-6 could also obviously improve organic sulfur removal; and when the temperature was lower than 650 ~C, adding 18-crown-6 or dibenzo-18-crown-6 could also improve pyritic sulfur removal. Moreover, through desorption experiment and pore analysis,one could also find out that when adding 18- crown-6 or dibenzo-18-crown-6 during the course of coal pyrolysis, the average diameter of the char became larger.