加压下煤炭直接液化残渣黏温特性研究

Study on viscosity-temperature characteristics of coal direct liquefaction residue under pressure

为实现液化残渣的高效利用,以神华煤直接液化残渣为研究对象,考察液化残渣在加压条件下的黏温特性,即采用Arrhenius方程对实验数据进行处理以获得不同升温阶段的液化残渣流动活化能。研究结果如下:神华液化残渣黏度随温度升高总体呈下降趋势,210℃~230℃时其黏度随温度下降较快,温度超过240℃后其黏度随温度下降趋势减缓,温度超过400℃后其黏度开始逐渐上升。温度在210℃~230℃范围时,流动活化能ΔE最大,其值为98.67kJ/mol;温度在240℃~390℃范围时,流动活化能ΔE减小,其值为85.80kJ/mol;温度在400℃~430℃范围时,流动活化能ΔE为负值,其值为-6.95kJ/mol,说明此时温度对液化残渣黏度的影响已非主导因素,分析其原因可能由于液化残渣开始发生缩聚而造成。

In order to realize the efficient utilization of liquefied residue,based on the direct liquefaction residue of Shenhua coal,the viscosity-temperature characteristics of the liquefied residue under the pressure condition were investigated.The experimental data was treated by Arrhenius equation,and the flow activation energy of the liquefaction residue in different temperature raising stages was obtained.The results show that:the viscosity of the liquefied residue decreases with the temperature increase generally.At 210 ℃~230 ℃,the viscosity decreases rapidly with temperature.When the temperature exceeds 240℃,the decreasing trend of viscosity with temperature slows down.When the temperature exceeds 400℃,the viscosity begins to rise gradually.When the temperature is between 210℃~230℃,the flow activation energy is the maximum(98.67 KJ/mol);When the temperature is between 240℃~390℃,the flow activation energy △E decreases to 85.80 KJ/mol.When the temperature is between 400℃ to 430℃,the flow activation energy △E is negative(-6.95 KJ/mol),it shows that the effect of temperature on the viscosity of liquefaction residue is no longer the dominant factor,which may be caused by the beginning of condensation and polymerization of liquefaction residue.