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浙江大学学报(工学版)
浙江大学学报(工学版)  2019, Vol. 53 Issue (9): 1826-1834    DOI: 10.3785/j.issn.1008-973X.2019.09.022
环境工程     
褐煤在N2及CO2气氛下的热解与富氧燃烧特性
山石泉1(),周志军1,*(),匡建平2,张煜2,岑可法1
1. 浙江大学 能源清洁利用国家重点实验室，浙江 杭州 310027
2. 宁夏神耀科技有限责任公司，宁夏 银川 751411
Lignite pyrolysis and oxy-fuel combustion characteristics under N2 and CO2 atmospheres
Shi-quan SHAN1(),Zhi-jun ZHOU1,*(),Jian-ping KUANG2,Yu ZHANG2,Ke-fa CEN1
1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
2. Ningxia Shenyao Technology Co. Ltd, Yinchuan 751411, China
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摘要：

为了掌握不同气氛下褐煤热解与富氧燃烧的特性以及其之间的联系，在管式炉反应器上利用锡盟褐煤在N2和CO2气氛以及600~1 000 °C条件下进行热解. 进一步对其在O2/N2以及O2/CO2气氛下进行富氧燃烧实验，考察不同反应温度(600~1 000 °C)以及不同氧气体积分数(21%~60%)条件下的富氧燃烧特性，结合热解实验结果探究CO2气化反应对富氧燃烧的影响. 结果表明，CO2气氛中锡盟褐煤在700 °C时开始CO2气化反应，随温度增加气化反应增强，CO2主要通过高温区的气化反应来影响煤热解及燃烧，700 °C以上气化反应能促进富氧燃烧进程. 对于O2/CO2气氛的富氧燃烧，当氧气体积分数为30%时，在800 °C以下温度对CO氧化反应影响更大，而在800 °C以上温度对CO2气化反应影响更大. 当氧气体积分数相同时，O2/N2以及O2/CO2气氛下褐煤富氧燃烧反应时间差异不大.
关键词： 富氧燃烧;  褐煤;  热解;  管式炉;  燃烧气氛;  CO2气化    
Abstract:

A pyrolysis experiment was carried out in a tubular furnace using Ximeng lignite under N2 and CO2 atmospheres at the temperature between 600 °C and 1000 °C, in order to investigate the characteristics of lignite pyrolysis and oxy-fuel combustion under different atmospheres and to obtain their relationship. Further oxy-lignite combustion experiments under O2/N2 and O2/CO2 atmospheres were performed to investigate the oxy-lignite combustion characteristics under different reaction temperatures (from 600 °C to 1 000 °C) and different oxygen concentrations (from 21% to 60%). The effects of CO2 gasification on oxy-fuel combustion were explored based on the results of lignite pyrolysis. Results show that the Ximeng lignite gasification starts at 700 °C under CO2 atmosphere and the CO2 gasification is enhanced with the increase of temperature. CO2 mainly affects coal pyrolysis and combustion through gasification reaction at high temperature; the presence of gasification reaction after 700 °C can promote the oxy-fuel combustion process. For oxy-fuel combustion under O2/CO2 atmosphere, when the oxygen concentration is 30%, the temperature below 800 °C has greater effect on CO oxidation, while the temperature above 800 °C has greater effect on CO2 gasification. Moreover, there is little difference in the combustion time between two atmospheres of O2/CO2 and O2/N2 with the same oxygen concentration.
Key words: oxy-fuel combustion    lignite    pyrolysis    tubular furnace    combustion atmosphere    CO2 gasification
收稿日期: 2018-07-22 出版日期: 2019-09-12
CLC:  TK 16  
通讯作者: 周志军     E-mail: shiquan1204@zju.edu.cn;zhouzj@zju.edu.cn
作者简介: 山石泉(1993—)，男，博士生，从事富氧燃烧，热辐射热力学以及能量高效转化系统研究.orcid.org/0000-0001-6635-7625. E-mail: shiquan1204@zju.edu.cn
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引用本文:

山石泉,周志军,匡建平,张煜,岑可法. 褐煤在N2及CO2气氛下的热解与富氧燃烧特性[J]. 浙江大学学报(工学版), 2019, 53(9): 1826-1834.

Shi-quan SHAN,Zhi-jun ZHOU,Jian-ping KUANG,Yu ZHANG,Ke-fa CEN. Lignite pyrolysis and oxy-fuel combustion characteristics under N2 and CO2 atmospheres. Journal of ZheJiang University (Engineering Science), 2019, 53(9): 1826-1834.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2019.09.022    或    http://www.zjujournals.com/eng/CN/Y2019/V53/I9/1826

图 1  管式炉热解及富氧燃烧实验系统示意图
煤种 工业分析 wB / % 元素分析 wB / %
M A V FC C H N S O
　　注：1）表中数据为空气干燥基.
锡盟褐煤 20.20 14.01 31.20 34.59 45.69 2.84 0.63 0.75 15.88
表 1  锡盟褐煤工业分析与元素分析1）
图 2  褐煤在N2和CO2气氛下热解的TG和DTG曲线
气氛 θS/°C θmax/°C Δθ0.5/°C (dw/dt)max D/(10?7 %·min?1·°C?3)
N2 259.04 442.54 192 ?2.582 40 1.173 28
CO2 285.16 438.16 219 ?2.669 26 0.975 50
表 2  褐煤在N2和CO2气氛下的热解特性参数
反应 θ/°C E/(kJ·mol?1) ρ
N2热解 259.04~442.54 63.42 0.990 7
CO2热解 285.16~438.16 74.83 0.991 0
CO2气化 720.16~900.00 249.11 0.980 0
表 3  褐煤热解气化的动力学参数
图 3  褐煤热解过程各种气体的生成量
图 4  不同氧气体积分数燃烧CO生成比例曲线
图 5  O2/CO2及O2/N2气氛下不同氧气体积分数的燃烧反应时间与最快反应速率
图 6  不同氧气体积分数下褐煤富氧燃烧n21值变化趋势
图 7  不同温度条件下燃烧CO生成比例曲线
图 8  典型富氧及空气工况下不同温度条件下燃烧反应时间及最快反应速率
图 9  不同温度下褐煤富氧燃烧n21值变化趋势
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