煤沥青球的氧化不熔化过程特性

doi:10.11949/j.issn.0438-1157.20171042

化工学报 ›› 2018, Vol. 69 ›› Issue (1): 499-506.DOI: 10.11949/j.issn.0438-1157.20171042

煤沥青球的氧化不熔化过程特性

郭源¹, 邵应娟¹, 钟文琪¹, 李开喜²

1 东南大学能源热转换及其过程测控教育部重点实验室, 能源与环境学院, 江苏南京 210096;
2 中国科学院山西煤炭化学研究所, 山西太原 030001

收稿日期:2017-08-02 修回日期:2017-10-14 出版日期:2018-01-05 发布日期:2018-01-05
通讯作者: 钟文琪
基金资助:
国家自然科学基金-山西煤基低碳联合基金重点项目（U1510204）。

Characteristics of oxidation stabilization process of coal pitch based spheres

GUO Yuan¹, SHAO Yingjuan¹, ZHONG Wenqi¹, LI Kaixi²

1 Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy & Environment, Southeast University, Nanjing 210096, Jiangsu, China;
2 Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, Shanxi, China

Received:2017-08-02 Revised:2017-10-14 Online:2018-01-05 Published:2018-01-05
Contact: 10.11949/j.issn.0438-1157.20171042
Supported by:
supported by Key Program of Joint Fund on Coal-Based Low Carbon of National Natural Science Foundation of China and Shanxi Province (U1510204).

摘要/Abstract

摘要：

氧化不熔化过程是煤沥青基球状活性炭制备中的核心工艺，对其过程特性和动力学机理的认识是实现氧化过程工艺优化的关键。本文以煤沥青萃取球为原料，通过实验研究，重点探讨了粒径范围、升温速率和氧化温度对其氧化不熔化过程的影响，并确定氧化动力学参数及其反应机理函数。结果表明：氧化不熔化过程可分为轻组分热解、初步氧化、氧化增重和恒温氧化失重4个阶段。煤沥青球经过氧化不熔化后，C、H含量减少，O含量增加，表面光滑平整。减小粒径并选取合适的升温速率（0.25～0.5℃·min^-1）以及氧化温度（275～325℃），更有利于氧化不熔化快速稳定地进行。粒径范围为0.3～0.6 mm的煤沥青球在升温速率为0.5℃·min^-1、氧化温度为300℃的条件下活化能最小，各个阶段的值分别为83.34、293.19、302.25和357.05 kJ·mol^-1。

关键词: 煤沥青球, 氧化, 热重分析, 动力学, 活性炭

Abstract:

Oxidation stabilization is the core process in the preparation of coal pitch based spherical activated carbon. Consequently the understanding of process characteristics and kinetic mechanism is the key to accomplish oxidation process optimization. The effects of particle size range, heating rate and oxidative temperature on oxidation stabilization process were discussed by experiments which used coal pitch spheres as the raw materials. The kinetic parameters and reaction mechanism function were determined. The results show that oxidation stabilization mainly consists of four stages, light component pyrolysis, preliminary oxidation, oxidative weight increment and constant temperature oxidative weightlessness, respectively. After oxidation stabilization, carbon and hydrogen content of coal pitch spheres reduce, oxygen content increases, and surface is much smoother. Reducing the particle size and selecting the appropriate heating rate(0.25-0.5℃·min^-1) and oxidative temperature(275-325℃) are beneficial for oxidation stabilization. The activation energy reaches the minimum values at particle size range of 0.3-0.6 mm, heating rate of 0.5℃·min^-1 and oxidative temperature of 300℃, which are 83.34, 293.19, 302.25 and 357.05 kJ·mol^-1 in every stage.

Key words: coal pitch spheres, oxidation, thermogravimetric analysis, kinetics, activated carbon

中图分类号:

郭源, 邵应娟, 钟文琪, 李开喜. 煤沥青球的氧化不熔化过程特性[J]. 化工学报, 2018, 69(1): 499-506.

GUO Yuan, SHAO Yingjuan, ZHONG Wenqi, LI Kaixi. Characteristics of oxidation stabilization process of coal pitch based spheres[J]. CIESC Journal, 2018, 69(1): 499-506.

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煤沥青球的氧化不熔化过程特性

Characteristics of oxidation stabilization process of coal pitch based spheres

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