摘要
以神东、新疆煤为研究对象,采用微量热重、常量固定床实验装置分别对原煤、脱矿煤、载铁煤在热解过程中的质量变化和气相产物进行了对比分析,研究了铁基矿物质对煤热解特性的影响.结果表明:煤热解出现最大失重速率和气相产物最大释放量的温区均与煤的变质程度有关,较低变质程度的神东煤在450℃左右出现最大失重,而新疆煤则为600℃;神东煤热解生成CH4,CO和CO2的最大释放温度小于新疆煤.载Fe煤热解过程中生成的气相产物总量大于原煤和脱矿物煤,显示了Fe的催化作用.该催化作用主要表现在热解达到最大失重速率的温度之后的缩聚阶段,这引起了H2的生成量增大.Fe的催化作用受煤变质程度的影响,对变质程度较低的神东煤的作用明显大于新疆煤.
Using the coal from Shendong（SD） and Xinjiang（XJ） as experimental samples, the weight loss and gaseous products from pyrolysis of raw coal, coal demineralized and coal loaded FeC13 were investigated by thermal gravimetric analysis and fixed-bed pyrolysis-gas chromatography, and the effect of Fe-based minerals on coal pyrolysis characteristics was studied. The results show that the temperature range of the maximum weight loss rate and maximum release amounts of gaseous products during coal pyrolysis change with metamorphic grade. The maximum weight-loss temperature of SD coal pyrolysis is 450℃, which is lower than 600℃ of XJ coal with higher rank. The maximum release temperature of CH4, CO and CO2 from SD coal pyrolysis is also lower than that from XJ coal pyrolysis. The total amount of gaseous products from coal loaded Fe is obviously larger than that from raw coal and coal demineralized, which presents the catalytic action of Fe on coal pyrolysis. This effect of Fe minerals mainly occurs in the third phase of pyrolysis-polycondensation stage after the maximum weight loss. In this stage, the emission amount of Hz is increased by Fe-based minerals in coal. The role of mineral containing-Fe is related to the coal metamorphism grade. Key words： coal; pyrolysis; Fe-based minerals; catalysis
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2010年第3期426-430,共5页
Journal of China University of Mining & Technology
基金
国家自然科学基金项目(20776092)
山西省自然科学基金项目(2008011019)
山西省留学人员基金项目(2007-30)
关键词
煤
热解
铁基矿物质
催化作用
coal
pyrolysis
Fe-based minerals
catalysis
