废轮胎内构件固定床热解过程优化

Pyrolysis Process Optimization of Waste Tire in Fixed-bed Reactor with Internals

通过分析废轮胎内构件固定床热解过程真空度和颗粒床层厚度对热解油收率和组成的影响,探讨废轮胎热解过程优化。结果表明:增大热解真空度和减小颗粒床层厚度均可促进热解油气更快地导出反应器,尽可能避免挥发分二次反应,从而显著提高热解油收率,但热解油中汽油馏分占比降低,馏分油占比升高;热解过程优化后(真空度为-5 kPa,颗粒床层厚度为10 mm),热解温度对热解油收率和组成影响不明显,热解温度为550~900℃时,热解油收率始终保持在50.1%~51.6%(格金分析油收率在95%以上),热解油中各组分占比无明显变化。

By analyzing the effects of vacuum degree and particle bed thickness on the yield and composition of pyrolysis oil during the pyrolysis process of waste tire in a fixed-bed reactor with internals,the pyrolysis process optimization of waste tire were investigated. The results showed that,increasing the vacuum degree of pyrolysis and reducing the thickness of the particle bed could promote the pyrolysis oil and gas to be discharged from the reactor faster,and avoid the secondary reactions of volatiles as much as possible,thereby significantly increase the yield of pyrolysis oil. However,the proportion of gasoline fraction in the pyrolysis oil decreased,and the proportion of distillate fraction increased. After the pyrolysis process was optimized(vacuum degree was -5 kPa,particle bed thickness was 10 mm),the pyrolysis temperature had no obvious effect on the yield and composition of pyrolysis oil. When the pyrolysis temperature was 550 ~ 900 ℃,the yield of pyrolysis oil was always maintained at 50.1% ~ 51.6%(the oil yield of Gejin analysis was above 95%),and the proportion of each component in the pyrolysis oil had no significant change.