摘要
为了探究煤与生物质在中高温度条件下共热解过程中热解气的释放特性及元素析出规律,本文采用固定床反应器对松木和兖州煤在800~1200℃温度下进行中高温热解实验,借助傅立叶红外气体分析仪和氢气分析仪对热解气的组分进行在线测量,并探索其动力学释放特性。结果表明:各热解气中可燃气体主要为H2、CO和CH4;热解温度升高,共热解气中的H2产量会大幅增加,高达75.4 mg/g反应物,CO产量缓慢增加至184.3 mg/g反应物,CH4产量下降;共热解过程中,H2析出最晚且过程在30~200 s,CO的释放过程比CH4快,且释放体积分数峰值更高,可达61.1μL/L;生物质的氮结构存在形式主要为更不稳定的氨基酸和蛋白质,热解时NH3和HCN析出更快但释放峰值更低;此外,煤和生物质共热解时的协同作用不影响CO和CH4的释放。本研究可为未来煤与生物质中高温闪速共热解制气以及低碳清洁能源的利用提供一定指导。
To elucidate the volatile dynamic release characteristics during co-pyrolysis of coal and biomass at high/medium temperatures and reveal the element evolution of pyrolysis gas,this study adopts fix-bed reactor to conduct pyrolysis of pine and Yanzhou coal at 800~1200℃.Fourier infrared gas analyzer and hydrogen analyzer are used to detect the gas composition online,thus to explore the dynamic release characteristics of the gases.The results show that,the combustible gases in pyrolysis gas are mainly H2,CO and CH4.As the pyrolysis temperature rises,the production of H2 in the co-pyrolysis gas dramatically increases to 75.4 mg/g blend,the CO production slightly increases to 184.3 mg/g blend,while the CH4 production decreases.During the co-pyrolysis process,H2 comes out the latest and its release period is around 30~200 s.CO releases faster than CH4 and its release peak can go up to 61.1μL/L.The main nitrogen-containing structure in the biomass are more unstable amino acids and proteins.Its gas evolutions of NH3 and HCN is faster but their release peaks are lower.Additionally,the synergistic effect in the co-pyrolysis of coal and biomass does not affect the release of CO and CH4.This study can provide some guidance for the future co-pyrolysis of coal and biomass and the utilization of low-carbon clean energy.
作者
金康华
章康
季银飞
吕洪坤
韩高岩
刘颖祖
JIN Kanghua;ZHANG Kang;JI Yinfei;LYU Hongkun;HAN Gaoyan;LIU Yingzu(Zhejiang Zheneng Shaoxing Binhai Thermal Power Co.,Ltd.,Shaoxing 312073,China;State Grid Zhejiang Electric Power Research Institute,Hangzhou 310014,China;State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China)
出处
《热力发电》
CAS
北大核心
2020年第9期39-45,共7页
Thermal Power Generation
基金
中国博士后科学基金项目(2019M650136,2019TQ0277)。
关键词
生物质
煤
共热解
高温
热解气
协同效应
制气
低碳清洁
biomass
coal
co-pyrolysis
high temperature
pyrolysis gas
synergistic effect
gas production
low-carbon cleanliness
