摘要
以管式炉热解实验和热重分析为基础,研究了初始温度对废轮胎热解产率及气相产物特性影响。结果表明,初始温度对废轮胎的热解存在重要影响。热重分析结果表明,废轮胎的热解过程存在2个主要失重过程,第一失重温度区间为200～500℃,第二失重温度区间为650～800℃;升温速率仅改变了热解的最大失重速率,并未改变废轮胎最终热解失重率;可通过提高升温速率能够缩短热解反应时间。在初始温度低于100℃时,废轮胎在800℃时热解已基本结束;当终温为800℃、初始温度在100～550℃范围内时,随着初始温度的提高,固、气两相产物产率均提高,而液相产物产率降低;其中气相中H2、CO和CH4的含量高于初始温度小于100℃时的含量;分析认为,可以通过调节热解的初始温度调节废轮胎热解在不同热解阶段的时间分配,适当提高热解初始温度有利于提高整个热解过程中的时间利用效率、改变废轮胎热解产物的分布;废轮胎热解气化的最佳温度区间为500～800℃。
Temperature is the key influencing factor on the process of scrap tire pyrolysis. The influences of initial temperature on the pyrolysis of scrap tire were studied based on the fixed-bed tube furnace pyrolysis tests and TG analysis. The results show that initial temperature makes an important impact on behaviors of scrap tire pyrolysis. From TG analysis, it is obviously recognised that there are two major weight loss processes during the course of tire pyrolysis, the first one is between 200-500℃ , and the second one 650 -800℃. Heating rate on-ly changes the max weight loss rate, but not alters the final weight loss. While initial temperature lowers than 100℃ , the pyrolysis of tire has come to end at 800℃. When final temperature is controlled at 800℃ , raising in-itial temperature is conductive to improve char and gas yield, but negtive to the yield of liquid, the contents of H2 , CO, ca4 also increase with the initial temperature controlled in the range of 100℃ - 550℃. It is consid-ered by integrated analysis that the distribution of the products from scrap tire pyrolysis can be changed by operat-ing a selective initial temperature. A rational initial temperature is also contributed to improve the efficiency of reaction, and it is found that the best temperature of pyrolysis and gasification of scrap tire is the range of 500 800℃.
出处
《环境工程学报》
CAS
CSCD
北大核心
2013年第5期1907-1912,共6页
Chinese Journal of Environmental Engineering
基金
国家"863"高技术研究发展计划项目(2009AA06Z320)
中央高校基本科研业务费专项资金项目(2010YH05)
关键词
废轮胎
热解
初始温度
scrap tire
pyrolysis
initial temperature
