氮气和含氧气氛下玉米秸秆热解气化产气规律研究  

Gas Production Law during Corn Stalk Pyrolysis and Gasification under Pure Nitrogen and Oxygen-containing Atmospheres

作　　者：姚锡文 周浩东[2] 齐鹏远 任海芳[1] 许开立 YAO Xiwen;ZHOU Haodong;QI Pengyuan;REN Haifang;XU Kaili(Liaoning Provincial Engineering Research Center for High-value Utilization of Magnesite,Yingkou Institute of Technology,Yingkou 115014,China;School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]营口理工学院辽宁省菱镁矿高值利用工程研究中心,营口115014 [2]东北大学资源与土木工程学院,沈阳110819

出　　处：《农业机械学报》2024年第5期379-385,共7页Transactions of the Chinese Society for Agricultural Machinery

基　　金：辽宁省菱镁矿高值利用工程研究中心基金项目(LMKKZ202301);国家自然科学基金项目(52004055);辽宁省自然科学基金项目(2021-MS-103);国家重点研发计划项目(2021YFC3001300)。

摘　　要：为了探究秸秆类生物质在热解和气化过程中的产气规律,以我国东北地区典型的玉米秸秆为原料,基于自行建立的管式炉生物质热解气化实验装置,系统研究了玉米秸秆在氮气气氛下热解和在含氧气氛下气化过程中CO、H_(2)、CO_(2)、CH_(4)和C_(n)H_(m)等小分子生物质燃气成分的释放特性,对比分析了不同热解温度和气化温度对不同燃气组分释放规律及其产率的影响。实验结果表明:玉米秸秆热解过程中最先释放的小分子气相产物是CO和CO_(2);当温度升高时生物质燃气中逐渐出现CH4和H2,且随着热解温度升高,CO的产率峰值最先出现且峰值出现在升温阶段,而CO_(2)、CH_(4)和H_(2)的产率峰值几乎同时出现在恒温阶段;热解温度升高,玉米秸秆热解产生的CO体积分数几乎没有变化,而CO_(2)的占比则随着温度的升高而降低;在400~500℃之间CH_(4)体积分数随着热解温度的升高而增加,在500℃以后,基本稳定在13%。在O_(2)体积分数为8%、N_(2)体积分数为92%的含氧气氛下,随着气化温度的升高,玉米秸秆气化产生CO_(2)气体的体积分数呈先增加后降低的趋势,而CO的体积分数随着温度的升高而增大,这说明高温气化条件下更有利于CO的释放,而低温条件下有利于CO_(2)的产生。In order to reveal the law of gas evolved from the pyrolysis and gasification processes of stalk biomass,the typical corn stalk in the rural areas of northeastern China was utilized as the pyrolysis experimental material.Based on the self-established pyrolysis and gasification experiment system in tube furnace,the release characteristics of CO,H_(2),CO_(2),CH_(4),CnHm and other small-molecule biomass gas components during the pyrolysis of corn stalk in nitrogen atmosphere and gasification in oxygen-containing atmosphere were systematically studied.The effects of different pyrolysis and gasification temperatures on the release characterization and yield of each syngas component were compared.The experiment results indicated that CO and CO_(2) were the first small molecule syngas products released during corn stalk pyrolysis.When the temperature was increased,CH_(4) and H_(2) gradually appeared in the syngas,and with the increase of pyrolysis temperature,the peak yield of CO first appeared in the heating stage while the peak yields of CO_(2),CH_(4) and H_(2) appeared almost simultaneously in the constant temperature stage.With the increase of pyrolysis temperature,the volume fraction of CO during pyrolysis was hardly changed.However,the CO_(2) proportion was decreased with the increase of temperature.The CH_(4) volume fraction was increased with the increase of pyrolysis temperature between 400℃ and 500℃,and the content basically stabilized at 13% after 500℃.In the oxygen-containing atmosphere with 8%O_(2) and 92%N_(2),the volume fraction of CO_(2) produced by corn stalk gasification showed a trend of first increasing and then decreasing with the increase of gasification temperature,while the volume fraction of CO was increased with the increase of temperature,indicating that the high temperature was more conducive to the release of CO,and the low temperature was favorable to the CO_(2) production.

关 键 词：生物质 玉米秸秆 热解 气化 生物质燃气 

分 类 号：TK6[动力工程及工程热物理—生物能]