纳米铁粉燃烧特性研究.pdf

上海理工大学学报
第34卷第1期
J. University of Shanghai for Science and Technology
Vol.34No.12012
文章编号:1007-6735(2012)01-0088-05
纳米铁粉燃煷特性研究
何丹丹,金晶,路選,蔡灿稳,姜又华,付彦宁
(上海理工大学能源与动力工程学院,上海200093)
摘要:通过对粒径为50,100,500和20×103nm铁粉的比表面积实验(BET法)、燃烧热值实验和
热分析实验,得到不同粒径铁粉的表面微观结构、燃烧热值和失重曲线,分祈粒径对比表面积、燃烧
热值的影响,研究不同粒径铁粉在10,20,30和40K/min升温速率下的燃烧特性参数和动力学参
数.结果表明:粒径减小,铁粉比表面积和燃烧热值均増大,当粒径为50nm时,燃烧热值最高,其
值为6792.1J/g.粒径增大,着火点温度、最高燃烧速率对应温度、燃尽温度升高,燃尽时同廷长;
升温速率增大,相同粒径铁粉的着火温度、最大燃娆逑率对应的温度和燃尽温度升高,納米铁粉的
最大燃烧速卒增大,而微米铁粉的最大燃烧速辛减小.随着粒径和升温速率的增大,活化能和指前
因子都增大且存在互补偿效应
关键词:納米铁粉;後米铁粉;比表面积;燃烧热值;热分析
中图分类号:TK16
文献标志码:A
Combustion Characteristics of Nano lron Powders
HE Dan-dan, JIN Jing, LU Yao, CAL Canwen, JIANG You-hua, FU Yan-ning
(College of Eneryy and Power Engineering, University of Shanghai fo
Science and Technolo. Shanghai 20009, China
Abstract: The surface microstructure, heat of combustion and thermogravimetric(TG)curves of
different size iron powders were obtained through BET, combustion and thermogravimetry experi
ments of iron powders of the size 50, 100. 500 and 20 x 10 nm. The effects of the size on specific
surface area and heat of combustion were analyzed. The combustion characteristic and kinetic pa
rameters of different size iron powders at heating rate of 10, 20, 30 and 40 K/min were mainly
studied The results show that the specific surface area and heat of combustion are increased with
the decrease of size, and the heat of combustion reaches the maximum value of 6. 1 J/g when
the size is 50 nm. As the size increases, the temperatures of ignition, maximum combustion rate and
burnout are increased and burnout time is prolonged. As the heating rate increases, the ignition
temperature, the temperature of maximum combustion rate and burnout temperature at the same
size are increasing. Maximum combustion rate of nano iron powders is increased while that of mi
cron iron powders is decreased. There is mutual compensation effect between activation energy and
收稿日期:2011-09-16
基金项目:上海市教委科研创新重点资助项目(12z2141)
作者简介:何丹丹(1985-),女,硕士.研究方向:清洁燃烧技术.E-mail:sedan215a163.com
金晶(联系人),女,教授,研究方向:清洁燃烧技术.E-mail:alicejint01163.com