硝酸改性-活化对褐煤热解焦脱硫性能的影响  

Nitric acid modification- activation influenced to desulfurization performances of lignite pyrolytic coke

作　　者：张蕾[1] 张念[1] 沙响玲 刘茜[1] 吕宝鹏 王龙伟[1] 

机构地区：[1]西安科技大学地质与环境学院,陕西西安710054

出　　处：《煤炭科学技术》2015年第4期137-140 5,5,共5页Coal Science and Technology

基　　金：陕西省教育厅科学研究计划(自然科学专项)资助项目(2013JK0869);陕西省科技统筹创新工程计划资助项目(2012KTZB03-01-02)

摘　　要：为考察硝酸改性-活化过程对热解焦烟气脱硫性能的影响,采用褐煤热解焦为原料,经过硝酸改性和水蒸气活化后进行脱硫性能评价,研究不同的活化条件对热解焦脱硫性能的影响。结果表明:在固液比为2.5︰1.0,焙烧温度为800℃,焙烧时间为4 h,硝酸溶液体积分数为25%的条件下,经过硝酸改性后,改性热解焦的SO2转化率维持在70%以上的时间增加6 min;在此基础上,将硝酸改性后的热解焦进行水蒸气活化。结果表明:活化温度为影响脱硫活性的最显著因素,温度800℃、水蒸气流量0.264 L/h、活化时间1.5 h是改性-活化热解焦的最优活化条件,在此条件下SO2转化率维持在70%以上的时间较未活化时增加2 min。In order to investigate a nitric acid modification- activation process affected to the flue gas desulfurization performances of the pyrolytic coke,with the lignite pyrolytic coke as the raw material,the evaluation of desulfurization performances was conducted after the nitric acid modification and steam activation and a study was conducted on different activation conditions affected to the desulfurization performances of pyrolytic coke. The results showed that when the solid- liquid ratio was 2. 5 ︰ 1. 0,a burning temperature was 800 ℃,burning time was 4 h and nitric acid solution volume fraction was 25%,after the modification of the nitric acid,the SO2 conversion rate of the modified pyrolytic coke would keep a time over 70% increased with 6 min. Based on the circumstances,a steam activation would be conducted on the pyrolytic coke when the nitric acid modified. The results showed that the activation temperature would be the most obvious factor affected to the desulfurization activity and the temperature of 800 ℃,the steam flow of 0. 264 L / h and the activated time of 1. 5 h would be the best activation of the modification- activated pyrolytic coke. Under the condition,SO2 conversion rate would keep over 70%time increased with 2 min in comparison with the non- activation time.

关 键 词：褐煤 烟气脱硫 硝酸改性 水蒸气活化 热解焦 SO2转化率 

分 类 号：TQ530.2[化学工程—煤化学工程]