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在热重分析仪、固定床和流化床实验台上对油页岩和半焦的着火特性进行了实验研究。在固定床和流化床实验中,根据排放气体(CO,CO_2)和床温的变化曲线判断着火温度,结果表明:随着粒径的增大,油页岩和半焦的热重着火温度和流化床一次投料着火温度逐渐增大;固定床实验测得的着火温度比其他技术低,对于流化床一次投料实验,半焦的着火温度在很大程度上取决于投料温度,不同的实验技术对着火机理有很大影响,油页岩固定床实验和流化床间断给料实验为均相着火,流化床一次给料实验油页岩着火机理逐渐向非均相着火过渡;利用热爆炸理论对不同实验条件导致的着火温度不同进行了理论分析,当无量纲换热系数ψ从0.4167变化到2.0时,无量纲着火温度θg从0.0599变化到0.06732。
The ignition characteristics of oil shale and semi-coke were experimentally studied on TGA, fixed bed and fluidized bed test bench. In the fixed bed and fluidized bed experiments, the ignition temperature was judged according to the change curve of the exhaust gas (CO, CO 2) and the bed temperature. The results showed that with the increase of particle size, the thermal ignition temperature of oil shale and semi- And the temperature of the fluidized bed increases with the initial charge of the fluidized bed. The ignition temperature measured by the fixed bed experiment is lower than that of other technologies. For a single feed experiment of the fluidized bed, the ignition temperature of semi-coke depends largely on the feed temperature, The experimental technique has a great influence on the fire mechanism. The fixed bed experiment of oil shale and the intermittent feed experiment of fluidized bed are homogeneous, and the ignition mechanism of the oil shale in the first feed experiment of fluidized bed gradually changes to the heterogeneous fire. The theory of thermal explosion theoretically analyzes the difference of ignition temperature caused by different experimental conditions. When the dimensionless heat transfer coefficient ψ changes from 0.4167 to 2.0, the dimensionless ignition temperature θg changes from 0.0599 to 0.06732.