基于Py-GC/MS的玉米秸秆快速热解实验研究

doi:10.3969/j.issn.1673-5854.2021.04.005

摘要/Abstract

摘要：

以玉米秸秆为原料，利用Py-GC/MS设备在不同热解条件下进行快速热解实验，并对热解气相产物进行在线检测分析，考察了热解时间、热解温度及ZSM-5催化剂对玉米秸秆热解特性及热解产物分布的影响。实验结果表明：热解温度越高，热解反应越充分，且热解温度为550℃时对应的热解产物品质最高，其中芳香族化合物最高达28.3%；随着热解时间增加，热解反应不断加剧，且热解时间为10 s时对应的热解产物品质最高，产物中酮类化合物最低为11.8%，芳香族化合物含量最高，可达28.3%；ZSM-5催化剂可显著促进二次反应中缩聚反应生成苯环，且能够促进一系列芳构化反应，脱除含氧芳香族类化合物中所含的氧元素，生成大量芳香烃类化合物，具有良好的催化脱氧性能，能够有效提高热解产物品质。

关键词: 玉米秸秆, Py-GC/MS, 热解时间, 热解温度, ZSM-5催化剂

Abstract:

Fast pyrolysis experiments were studied by using pyrolysis-gas chromatography/mass spectrometry(Py-GC/MS) under different pyrolysis conditions with corn stalk as material, and the pyrolysis gases were online analyzed. The effects of pyrolysis time, pyrolytic temperature and ZSM-5 catalyst on the pyrolysis characteristics and distribution of pyrolysis products of corn stalk were focused. The experimental results showed that the higher pyrolysis temperature was, the more fully pyrolysis reaction would be, and the pyrolysis products of 550℃ had the highest quality, the content of aromatic compound was the maximum(28.3%). Pyrolysis reaction constantly intensified with the increase of pyrolysis time, and the pyrolysis products of 10 s had the highest quality, the content of ketones was the minimum(11.8%) and the content of aromatic compound was the maximum(28.3%); ZSM-5 catalyst could significantly promote the polycondensation reaction to generate benzene ring in the secondary reactions, and could also promote a series of aromatization reactions, remove oxygen out of oxygen species of aromatic compounds, generate a large number of aromatic hydrocarbons. So ZSM-5 catalyst had good performance of catalytic deoxidization, and it could effectively improve the quality of the pyrolysis products.

Key words: corn stalk, Py-GC/MS, pyrolysis time, pyrolysis temperature, ZSM-5 catalyst

中图分类号:

TQ35
TK6

刘志超, 王妍艳, 郑方栋, 万迪. 基于Py-GC/MS的玉米秸秆快速热解实验研究[J]. 生物质化学工程, 2021, 55(4): 29-33.

Zhichao LIU, Yanyan WANG, Fangdong ZHENG, Di WAN. Fast Pyrolysis Experiments of Corn Stalk by Py-GC/MS[J]. Biomass Chemical Engineering, 2021, 55(4): 29-33.

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产物 product	不同热解温度下相对峰面积relative peak area at different pyrolysis temperature/%
产物 product	450 ℃	500 ℃	550 ℃	600 ℃	650 ℃	700 ℃
二氧化碳carbon dioxide	68.3	37.0	24.2	21.2	25.5	24.0
烃类hydrocarbons	15.5	11.9	7.7	8.0	8.0	6.8
酸类acids	0.7	21.0	13.6	13.1	11.7	10.1
醛类aldehydes	0.0	0.0	1.3	1.7	2.2	1.7
酮类ketones	0.0	7.1	11.8	14.3	14.6	14.7
醇类alcohols	0.0	1.8	2.1	7.6	7.1	5.3
呋喃类furans	0.0	0.0	4.1	2.5	2.1	2.5
糖类carbohydrate	0.0	1.0	6.4	5.7	6.1	8.8
含氮类nitrogen	0.0	0.0	0.5	0.6	0.4	1.1
芳香族类aromatics	15.4	20.1	28.3	25.2	22.2	25.0

产物 product	不同热解时间下相对峰面积relative peak area under different pyrolysis time/%
产物 product	5 s	10 s	20 s	30 s
二氧化碳carbon dioxide	22.3	24.2	25.1	26.2
烃类hydrocarbons	8.7	7.7	7.6	9.3
酸类acids	11.6	13.6	11.9	11.1
醛类aldehydes	5.9	1.3	7.0	4.2
酮类ketones	21.1	11.8	18.0	18.2
醇类alcohols	4.7	2.1	3.9	3.9
呋喃类furans	1.1	4.1	2.3	1.6
糖类carbohydrate	1.7	6.4	6.4	8.2
含氮类nitrogen	0.5	0.5	0.3	0.0
芳香族类aromatics	22.3	28.3	17.5	17.3

产物 product	相对峰面积/% relative peak area	产物 product	相对峰面积/% relative peak area
苯benzene	4.9	愈创木酚guaiacol	7.0
甲苯toluene	14.1	3-甲基, 1H-茚3-methyl, 1H-indene	0.5
乙基苯ethylbenzene	0.7	萘naphthalene	2.5
间二甲苯m-xylene	13.9	2, 3-二氢苯并呋喃2, 3-dihydrobenzofuran	4.4
对二甲苯p-xylene	1.4	4-乙基-2-甲氧基苯酚4-ethyl-2-methoxyphenol	0.4
邻乙基甲苯o-ethyl toluene	0.8	1-甲基萘1-methylnaphthalene	3.0
1, 2, 3-三甲苯1, 2, 3-trimethylbenzene	0.6	1, 7-二甲基萘1, 7-dimethylnaphthalene	0.7
茚满indan	1.7

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