CIESC Journal ›› 2021, Vol. 72 ›› Issue (5): 2604-2615.DOI: 10.11949/0438-1157.20201738

• Catalysis, kinetics and reactors • Previous Articles     Next Articles

Reaction kinetics of naphthalene cracking into small molecule gas in a micro fluidized bed

ZHANG Yuming1(),JI Dexin1,2,ZHU Hanwen1,2,WAN Lifeng1,2,ZHANG Wei1,WEN Hongyan1,2,YUE Junrong2()   

  1. 1.State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China
    2.State Key Laboratory of Multi-Phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2020-12-03 Revised:2021-02-20 Online:2021-05-05 Published:2021-05-05
  • Contact: ZHANG Yuming,YUE Junrong

微型流化床中萘裂解生成小分子气体的反应动力学研究

张玉明1(),纪德馨1,2,朱翰文1,2,万利锋1,2,张炜1,温宏炎1,2,岳君容2()   

  1. 1.中国石油大学(北京)重质油国家重点实验室,北京 102249
    2.中国科学院过程工程研究所,多相复杂系统国家重点实验室,北京 100190
  • 通讯作者: 张玉明,岳君容
  • 作者简介:张玉明(1985—),男,博士,副教授,ymzhcup@163.com
  • 基金资助:
    国家自然科学基金项目(U1862107);国家重点研发计划项目(2018YFE0183600);中国石油大学(北京)科研基金项目(20200127)

Abstract:

Gasification is one of the effective ways for high-value utilization of coal, biomass and other carbon-containing fuels. To investigate the reaction characteristics of tar during gasification, naphthalene was selected as the tar model compound and converted in a micro fluidized bed by using fluid catalytic cracking (FCC) catalyst and lignite coke as contact cracking carrier. The cracking kinetics of naphthalene in terms of CH4 and H2 generation were calculated by Friedman method and integral method respectively. The results show that both FCC catalyst and lignite coke had obvious catalytic effect on naphthalene. When lignite coke was used for naphthalene cracking, the overall reaction activation energy was lower than that of FCC catalyst. The catalytic cracking of naphthalene over FCC catalyst was close to three-dimensional diffusion (spherical symmetry) and nucleation and growth (n=2/3) models, while the three-dimensional diffusion (cylindrical symmetry) and contraction geometry (cylindrical symmetry) models had a good fitting degree for naphthalene cracking using lignite coke.

Key words: micro fluidized bed, naphthalene, catalytic cracking, reaction kinetics

摘要:

气化是煤、生物质以及其他含碳燃料高值化利用的有效途径之一。为了考察气化过程中焦油的反应转化特性,选取萘作为焦油模型化合物,以流化催化裂化(fluid catalytic cracking,FCC)催化剂及褐煤热解焦作为接触裂解载体,利用微型流化床考察流化条件下萘催化裂解反应规律,并采用Friedman法和积分法计算萘裂解生成CH4和H2等典型气体组分的动力学参数。结果表明,FCC催化剂与褐煤焦均对萘裂解有明显的催化效果,褐煤焦用于萘裂解的反应活化能整体数值低于FCC催化剂。FCC催化剂裂解萘生成H2符合三维扩散(球形对称)模型,生成CH4符合成核与生长(n=2/3)模型。相应地,褐煤焦裂解萘反应生成H2和CH4分别采用收缩几何形状(圆柱形对称)和三维扩散(圆柱形对称)具有较好的拟合度。

关键词: 微型流化床, 萘, 催化裂解, 反应动力学

CLC Number: