关键词: 油页岩, 差热, 能耗, 热重分析, 脱水

Abstract: Thermogravimetry analysis (TG) coupled with differential scanning calorimetry (DSC) was applied,in the nitrogen background,to analyse dry basis,air dried basis and as-received basis of five kinds of oil shale as well as purified water.First of all,one of the oil shale samples was used in thermogravimetry analysis with different heating rate,the heating rate of 3℃/min,10℃/min and 20℃/min, curves were plotted to illustrate the relationship between energy consumption for per unit mass of water evaporation and temperatures.Results show that the energy taken in evaporation process for normal state water remains constant,which is about 2321kJ/kg.The different stages of curves of air dried basis and as-received basis represent the evaporation processes of different moisture in oil shale.According to the mechanism of moisture in oil shale,we get the average energy consumption of the external water,internal water,surface water and absorbed water under three different kinds of heat rate.Compared with normal state water,the ratios are 1 to 1.18 to 1.95 to 1.60 to1.97、1 to 1.1 to1.84 to 1.58 to 1.90、1 to 1.14 to 1.88 to 1.59 to 1.93.It was proven that heating rate almost has no effect on energy consumption of dehydration.Thermogravimetry analysis was applied in the other four kinds of samples with the rate of 3℃/min, the calculation results show that the average energy consumption of different kinds of oil shale is basically the same.

Key words: oil shale, differential scanning calorimetry, energy consumption, thermogravimetry analysis, dewatering