摘要
利用小型流化床热解试验台,对比分析了小龙潭褐煤和李嘴孜烟煤在不同热解温度下的热解过程,获得了不同热解温度下热解产物产率和成分的变化规律.结果表明：与李嘴孜烟煤相比,煤化程度较低的小龙潭褐煤热解后产生的煤气产率较高,煤气中H2和CO2的体积分数较高,CH4的体积分数较低,焦油产率较低,焦油中烷烃类质量分数较高;当热解温度从500℃升高至700℃时,小龙潭褐煤和李嘴孜烟煤的煤气产率均明显升高,半焦产率有所降低;焦油和热解水产率随着温度的升高先升高后降低,在550~600℃内达到最大值;随着热解温度的升高,煤气中H2的体积分数明显升高,而CO2体积分数则有所降低,同时焦油中烷烃类质量分数降低,萘类芳烃类质量分数升高.
A comparative analysis was conducted on the pyrolysis process of Xiaolongtan lignite and Lizuizi bituminous coal under different pyrolysis temperatures using a small-scale fluidized bed pyrolysis reactor, thus obtaining the change rule of pyrolysis product yield and components. Results show that compared with Lizuizi bituminous coal, the low rank Xiaolongtan lignite has a higher pyrolysis gas yield containing high concentrations of H2 and CO2, and low concentration of CH4, and has a lower tar yield containing high concentration of hydrocarbons. When the pyrolysis temperature is raised from 500 ℃ to 700 ℃, the gas yield of both Xiaolongtan lignite and Lizuizi bituminous coal increases significantly, while the semicoke yield decreases. The tar and pyrolysis water yield rises first and then decreases with the increase of temperature, which reaches the maximum at 550-600 ℃. With the rise of pyrolysis temperature, the concentration of H2 in coal gas increases obviously, and that of CO2 decreases to some extent; whereas the mass fraction of hydrocarbons in tar decreases and that of naphthalene aromatics increases simultaneously.
出处
《动力工程学报》
CAS
CSCD
北大核心
2015年第10期792-797,839,共7页
Journal of Chinese Society of Power Engineering
基金
国家高技术研究发展计划(863)资助项目(2013AA051203)
高等学校学科创新引智计划资助项目(B08026)
关键词
流化床
褐煤
烟煤
热解产物
温度
fluidized bed
lignite
bituminous coal
pyrolysis product
temperature
