油泥与微藻生物质掺混共热解动力学研究

Reaction Kinetics of Oil Sludge and Microalgae Co-Pyrolysis

针对油泥与微藻生物质掺混共热解处理工艺,利用热分析仪在N_2气氛下对其进行不同升温速率(β)以及不同掺混比(φ)的实验研究,分析了各自组成及性质,通过分析质量损失(TG)、质量损失变化率(DTG)曲线,对热解过程进行反应阶段划分。此外,采用Doyle积分及Hancock经验公式进行热解动力学参数拟合求解。实验结果表明,油泥与微藻掺混热解过程可划分为5个阶段;其中,掺混共热解过程中阶段Ⅱ、Ⅲ、Ⅳ的反应级数分别为1级、1.5级、0.5级,活化能分别为15.07～42.34 kJ/mol、62.69～76.86 kJ/mol、7.99～15.66 kJ/mol;油泥与微藻掺混共热解,改善了油泥的颗粒形态,提高了传热传质效率,降低了反应阻力,从而降低了热解过程中的活化能。

To investigate co-pyrolysis treatment of oil sludge and microalgae,the composition and properties of oil sludge and microalgae were analyzed,respectively.With utilizing a thermogravimetric analyzer,co-pyrolysis experiments were performed with different heating rates (β) and mixing ratios (φ) under nitrogen atmosphere.The thermogravimetry (TG) curves and derivative thermogravimetric (DTG) curves were analyzed to understand the co-pyrolysis reaction kinetics.Experimental results show that the co-pyrolysis process can be divided into several different stages.In addition,Doyle integral and Hancock empirical formula were applied to obtain kinetic parameters from experimental data.It was found that there are five stages in the sludge and microalgae co-pyrolysis process.Reaction orders of stage Ⅱ,Ⅲ and Ⅳ are 1,1.5 and 0.5, respectively,and their corresponding activation energies are 15.07-42.34 kJ/mol,62.69-76.86 kJ/mol, and 7.99-15.66 kJ/mol.Co-pyrolysis of oil sludge and microalgae can lead to preferred particle morphology,improve heat and mass transfer efficiency,reduce the reaction resistance,and thus reduce activation energy in the pyrolysis process.