全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...
-  2017 

乌拉盖褐煤热解特性及反应动力学参数研究

Keywords: 褐煤,半焦,热解特性,燃烧特性,动力学参数 lignite,semi-coke,pyrolysis characteristics,combustion characteristics,dynamic parameters

Full-Text   Cite this paper   Add to My Lib

Abstract:

为获得较好的褐煤半焦制备工艺参数,研究了不同制备条件(热解终温、升温速率、原煤粒径、热解气氛)下制得的乌拉盖褐煤半焦的燃烧性能和燃烧动力学参数。结果表明,热解终温对半焦品质的影响最大,热解升温速率、原煤粒径和热解气氛对半焦燃烧特性的影响不显著。热解终温由350℃升至600℃时,反应指数RI由235℃升至292℃,半焦着火性能变差;燃尽指数Cb由4.68升至6.15,半焦燃尽性能变差;爆炸指数Kd由2.54降至0.46,半焦爆炸倾向性变低;反应活化能由44.4 k J/mol升至63.4 k J/mol,半焦燃烧动力学特性变差。热解终温为520℃时制得的半焦反应指数、燃尽指数、爆炸指数和反应活化能分别为265℃,5.34、0.80和53.2 k J/mol,属于易着火、易燃尽、中等爆炸燃料,燃烧特性良好。 To obtain better process parameters of semi-coke for lignite,the effects of heating rate,temperature,atmosphere and particle size on pyrolysis characteristics and dynamic parameters of Wulagai lignite were investigated.The results show that the final pyrolysis temperature is the main influencing factor,the heating rate,pyrolysis atmosphere and particle size have little influence. When the final pyrolysis temperature increases from 350 ℃ to 600 ℃,The rejection index(RI) varies from 235 ℃ to 292 ℃,the burnout index(C_b) varies from4. 68 to 6. 15,the explosive index(K_d) decreases from 2.54 to 0.46,the activation energy( E) varies from 44.4 k J/mol to 63.4 k J/mol.In the above changes,the fire behaviour,burnout performance and explosive tendency of Wulagai lignite semi-coke become worse.The semicoke which is obtained at 520 ℃ pyrolysis temperature is easy to burn,burn out and difficult to explode,and the rejection index,the burnout index,the explosive index and the activation energy are 265 ℃,5.34,0.80,53.2 k J/mol

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133