油漆废渣化学链气化特性及动力学行为

为探究化学链气化技术处理油漆废渣的可行性,通过热重分析仪以及管式炉-在线质谱仪联用研究了以Fe₂O₃为载氧体的油漆废渣化学链气化特性及动力学行为。热重分析结果表明:随着Fe₂O₃掺混比例的增加,掺混Fe₂O₃的油漆废渣热解气化时的总体质量损失量会减少。在升温速率为40℃/min时,当油漆废渣中Fe₂O₃掺混比例(质量分数)分别为10%、30%、50%时,最大质量损失速率相应分别为-27.23%/min、-23.39%/min和-17.12%/min,低于未掺混Fe₂O₃的油漆废渣热解时的最大质量损失速率-27.56%/min;油漆废渣化学链气化平均活化能分别为192.31、204.81、166.98 kJ/mol,明显低于未掺混Fe₂O₃的油漆废渣热解时的平均活化能223.29 kJ/mol。管式炉-质谱联用分析结果表明:反应...

Chemical Looping Gasification Characteristics and Kinetic Behavior of Paint Slag

To explore the feasibility of chemical looping gasification (CLG) technology in the treatment of paint slag, experiments were carried out by thermogravimetry, tube furnace and mass spectrometry. Based on the Fe2O3 carrier, the CLG characteristics of paint slag and the kinetic behavior of gas product formation were studied. Thermogravimetric analysis shows that with the increase of Fe2O3 blending ratio, the total mass loss of paint waste slag blended with Fe2O3 during pyrolysis and gasification is reduced. When the heating rate is 40 ℃/min, the maximum mass loss rate of Fe2O3 in the paint slag is -27.23%/min, -23.39%/min and -17.12%/min, respectively, which is significantly lower than that of paint waste slag pyrolysis alone (-27.56%/min). When the mass fraction of Fe2O3 is 10%, 30% and 50%, the average activation energy of CLG of paint slag is 192.31, 204.81 and 166.98 kJ/mol, respectively, which is significantly lower than the average activation energy (223.29 kJ/mol) when the paint slag is pyrolyzed alone. The results of tube furnace mass spectrometry show that when the reaction temperature is 800 ℃, the low heating value of the gas-phase product is 7.24, 7.36 and 6.04 MJ/m3 when the Fe2O3 mass fraction in the paint slag is 10%, 30% and 50%, respectively. The low heating value of the gas-phase product is obviously lower than the low heating value of the gas-phase product (8.76 MJ/m3) when the paint slag is pyrolyzed alone. The addition of Fe2O3 will reduce the low heating value of gas phase products. When Fe2O3 mass fraction is 50%, the activation energies of CO, CH4 and H2 generated by CLG of paint slag are 22.67, 31.94, 18.99 kJ/mol, respectively, which are significantly lower than those of the single pyrolysis of paint slag. TiO2 in paint slag and Fe3O4 after reaction mainly stay in solid residue, which can be recovered by a magnetic separation device.