Abstract: The effect of shale ash on pyrolytic behaviors of oil shale from the fourth layer of Gonglangtou mine, Huadian, Jilin Province, was studied by TG-FT-IR analyzer, and the effect of silica as chemical inert material used as reference. The weight loss and evolution of volatiles from the pyrolysis of mixed oil shale and shale ash were explained by analysing the variation of composition of the pyrolytic solid residue. The results showed that shale ash could promote the pyrolysis of both organic and inorganic matters in the oil shale. When the content of shale ash in the mixture was 83%, the weight loss of oil shale was increased by 1.92%, 3.39% and 18.99%, compared with oil shale mixed with silica in the temperature ranges of 300~600, 600~750, and 750~900℃, respectively. The on-line FT-IR analysis results showed that CO2 released before aliphatic hydrocarbons at lower temperature. At high temperatures (over 750℃), CO2 was merely generated from the pyrolysis of the mixture of oil shale and shale ash, which could be attributed to the promoted decomposition of carbonates under the effect of shale ash and the reaction between CaSO4 and carbon residue.

Key words: shale ash, oil shale, pyrolysis, TG-FT-IR

摘要： 以吉林桦甸-公郎头四层油页岩为原料，以掺混SiO2的油页岩为对比样品，利用热重-红外联用仪考察了页岩灰对油页岩热解特性的影响，通过分析热解固相产物组成变化对热解失重及产物析出规律进行了研究. 结果表明，页岩灰对油页岩中的有机质和矿物质失重过程均有促进作用，当页岩灰或SiO2含量为83%时，在300~600, 600~750, 750~900℃三个加热温度区间内，掺混页岩灰样品比掺混SiO2样品的失重率分别提高1.92%, 3.39%和18.99%. 低温段有机质热解过程中CO2先于脂肪烃热解析出，且750℃后CO2析出峰仅出现在掺混页岩灰的样品中，应为油页岩中难分解的碳酸盐在页岩灰作用下加速分解及页岩灰中CaSO4与残炭反应共同作用所致.

关键词: 页岩灰, 油页岩, 热解, 热重-红外联用