Abstract:

Experimental research on combustion characteristics of Huadian oil shale semi-coke was investigated under four different heating rates by using the thermogravimetric analyzer. The results show that the combustion process of Huadian oil shale semi-coke divided into three stages. The largest mass loss and the most heat release appeared in the first stage. Because of little fixed carbon and thermal decomposition of minerals, the endothermic process appeared in the third stage. Due to heat and mass transfer, the temperatures of the ignition and complete combustion increased with increasing heating rate. The kinetic parameters analyzed by the Friedman method indicated that the combustion of Huadian oil shale semi-coke was a complex multiple rections. The apparent activation energy calculated between 90 kJ/mol and 120 kJ/mol at lower temperature region, which is lower than that at higher temperature region with the apparent activation energy between 150 kJ/mol and 200 kJ/mol.

Key words:

Oil shale,    , Semi-coke,    , Combustion,   ,  Kineticsmso-ascii-font-family: Calibri, mso-ascii-theme-font: minor-latin, mso-fareast-font-family: 宋体, mso-fareast-theme-font: minor-fareast, mso-hansi-font-family: Calibri, mso-hansi-theme-font: minor-latin">

摘要： 针对目前油页岩干馏制油产物半焦利用问题, 使用热重分析仪对桦甸油页岩半焦燃烧性质进行了实验研究。结果表明, 桦甸油页岩半焦燃烧过程可分三个阶段, 其中第一阶段质量损失最大, 燃烧放热最多。第三阶段半焦固定碳燃烧殆尽, 矿物质分解, 表现为吸热。受传质传热影响, 桦甸油页岩半焦燃烧着火温度和燃烬温度随着加热速率的升高而增大。用Friedman 模型处理桦甸油页岩半焦燃烧动力学。结果表明, 在低温区, 由于主要是半焦中固定碳与氧气发生氧化反应, 反应相对较易进行, 其表观活化能较低(90～ 120 kJ/mo l);在高温区, 大量矿物质分解, 反应相对较难, 表观活化能较高(150 ～ 200 kJ/ mo l)。

关键词: 油页岩 , 半焦 , 燃烧 , 动力学