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[1]高豪杰,朱跃钊,马婷婷,等.褐煤直接热解特性及动力学行为的热分析研究[J].南京工业大学学报(自然科学版),2014,36(03):17-21.[doi:10.3969/j.issn.1671-7627.2014.03.004]
 GAO Haojie,ZHU Yuezhao,MA Tingting,et al.Thermal analysis on in-situ pyrolysis and kinetics characteristics of lignite[J].Journal of NANJING TECH UNIVERSITY(NATURAL SCIENCE EDITION),2014,36(03):17-21.[doi:10.3969/j.issn.1671-7627.2014.03.004]
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褐煤直接热解特性及动力学行为的热分析研究()
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《南京工业大学学报(自然科学版)》[ISSN:1671-7627/CN:32-1670/N]

卷:
36
期数:
2014年03期
页码:
17-21
栏目:
出版日期:
2014-05-20

文章信息/Info

Title:
Thermal analysis on in-situ pyrolysis and kinetics characteristics of lignite
文章编号:
1671-7627(2014)03-0017-05
作者:
高豪杰朱跃钊马婷婷陈海军付烽廖传华
南京工业大学 机械与动力工程学院,江苏 南京 211800
Author(s):
GAO HaojieZHU YuezhaoMA TingtingCHEN HaijunFU FengLIAO Chuanhua
College of Mechanical and Power Engineering,Nanjing Tech University,Nanjing 211800,China
关键词:
褐煤 直接热解 含水率 热质量分析 动力学
Keywords:
lignite in-situ pyrolysis moisture content thermal mass analysis kinetics
分类号:
TQ530.2
DOI:
10.3969/j.issn.1671-7627.2014.03.004
文献标志码:
A
摘要:
提出了一种不经预干燥的褐煤直接热解工艺,将褐煤的干燥与热解气化集成于同一个反应器中,利用自身干燥产生的水蒸气作为气化剂,提高其转化效率。采用热质量分析仪测定了海拉尔褐煤的热解特性,分析了其直接热解的可行性; 考察了升温速率和含水率对直接热解行为的影响; 通过动力学参数对直接热解行为进行定量分析。结果表明:海拉尔褐煤的直接热解可分为初始干燥阶段、干燥-热解阶段(活化能小于5 kJ/mol)、主要热解阶段(活化能为10~24 kJ/mol)和缩聚反应阶段(活化能为65~85 kJ/mol); 提高升温速率促进了水分和挥发分的协同反应、挥发分析出和缩聚反应降低了活化能,固定碳剩余质量分数由23.34%减小至19.66%; 在升温速率100 ℃/min条件下,随着试样含水率的增加,水分与固体的反应加强,活化能降低,热解固体干基产率由61.62%降低至59.23%,说明褐煤中水分对其热解有促进作用。
Abstract:
An in-situ pyrolysis technique by integrated drying and pyrolysis in one reactor for lignite with high moisture content was proposed.The in-situ steam evaporated from the lignite was utilized as a gasification agent to improve the conversion efficiency.In-situ pyrolysis characteristic of Hailer lignite was investigated by a thermogravimetric analyzer.The feasibility of in-situ pyrolysis,the effects of moisture content and heating rate were discussed,and quantitative analysis was carried out according to kinetics parameters.Results demonstrated that there were 4 sections in the direct pyrolysis,called the initial drying,drying-pyrolysis(activation energy <5 kJ/mol),main pyrolysis(activation energy between 10-24 kJ/mol), and polycondensation stage(activation energy between 65-85 kJ/mol).The fast-heating condition postponed the desorption of water,which favored the copyrolysis among the in-situ moisture,volatiles and char.The fixed carbon yield reduced from 23.34% to 19.66%.The increase of moisture content reduced the activation energy,while interaction between the water and the solid was strengthened.The yield of solid(on a dry basis)decreased from 61.62% to 59.23%, thus it proved that the moisture in the lignite promoted the pyrolysis reaction.

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备注/Memo

备注/Memo:
收稿日期:2013-07-24
基金项目:国家科技支撑计划(2014BAJ01B00); 江苏省科技支撑计划(BE2013127); 江苏省普通高校研究生科研创新计划(CXZZ13_0431)
作者简介:高豪杰(1986─),男,河南新乡人,博士生,主要研究方向为生物质热化学转化; 朱跃钊(联系人),教授,E-mail:zyz@njtech.edu.cn..
更新日期/Last Update: 2014-05-20