摘要
油页岩是我国重要的非常规油气资源,其开发利用对缓解我国能源短缺问题具有重大意义。油页岩灰分高,使油页岩热解过程中气相物质在颗粒内受到的传质阻力较大,影响热解产物的分布。搭建了单颗粒油页岩热解试验台,针对灰层传质阻力对单颗粒油页岩热解特性的影响进行试验研究,对油页岩热解过程提供更本质的理解,为热解模型搭建提供基础,重点探究颗粒粒径、热解温度等因素对热解产物分布的影响,得到不同气体流速、颗粒粒径和热解温度下单颗粒油页岩热解产物的分布。研究发现,气体流速对油页岩颗粒热解产物分布影响不大;随着颗粒粒径增加,热解一次产物在析出颗粒前,发生更多热解二次反应,通过复杂的热解二次反应使部分热解产物重新被固定于半焦中,导致产物中页岩油比例下降、气体比例增加。颗粒粒径越大,在高热解温度下热解二次反应越明显,导致粗颗粒热解产物中页岩油比例随热解温度的升高,呈先升后降的趋势,而细颗粒热解产物中页岩油的比例随着热解温度的增加而增加。
Oil shale is an important unconventional oil and gas resources in China.Its development and utilization is of great significance to alleviate the problem of energy shortage in China.Due to the high ash content of oil shale,the mass transfer resistanceof gaseous matter against the intraparticle is quite high,which has significant effects on the distribution of pyrolysis products of oil shale.In this paper,a pyrolysis experimental system for single particle oil shale was built to study the influence of mass transfer resistance of ash layer on pyrolysis characteristics of single particle oil shale,which can provide a more essential understanding of the pyrolysis process of oil shale and provide a basis for the construction of pyrolysis model.The effects of particle size,pyrolysis temperature and other factors on the distribution of pyrolysis products were studied,and the distribution of pyrolysis products of single grain oil shale with different gas flow rates,particle sizes and pyrolysis temperatures was obtained.It is found that gas flow rate has little effect on the distribution of pyrolysis products of oil shale particles.With the particle size increasing,more secondary pyrolysis reactions happens before the primary pyrolysis products are separated out.Part of the pyrolysis products are fixed in the semi coke again through the complex secondary pyrolysis reaction,which leads to the decrease of shale oil proportion and the increase of gas proportion in the products.The larger the particle size is,the more obvious the secondary pyrolysis reaction is at higher temperatures.As a result,the proportion of shale oil in the pyrolysis products of coarse particles increases first and then decreases with the increase of pyrolysis temperature,while the proportion of shale oil in the pyrolysis products of fine particles increases with the increase of pyrolysis temperature.
作者
冯卫强
白瑞祺
冯玉鹏
姚宣
张缦
黄逸群
杨海瑞
FENG Weiqiang;BAI Ruiqi;FENG Yupeng;YAO Xuan;ZHANG Man;HUANG Yiqun;YANG Hairui(Beijing Guodian Longyuan Environmental Engineering Co.,Ltd.,Beijing 100039,China;State Key Laboratory of Power Systems,Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China)
出处
《洁净煤技术》
CAS
北大核心
2021年第3期123-128,共6页
Clean Coal Technology
基金
国家重点研发计划资助项目(2019YFE0102100)
C9高校科技合作项目(201903D421009)。
关键词
单颗粒
油页岩
热解
产物分布
single particle
oil shale
pyrolysis
products distribution
