油漆废渣化学链气化特性及动力学行为

Chemical Looping Gasification Characteristics and Kinetic Behavior of Paint Slag

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Fe 2O 3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Fe 2O 3掺混比例的增加,掺混Fe 2O 3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Fe 2O 3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Fe 2O 3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Fe 2O 3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:反应温度为800℃,油漆废渣中Fe 2O 3质量分数为10%、30%、50%时,生成气相产物的低位热值相应分别为7.24、7.36和6.04 MJ/m 3,低于未掺混Fe 2O 3的油漆废渣热解气相产物的低位热值8.76 MJ/m 3,Fe 2O 3加入会降低气相产物的低位热值;当Fe 2O 3质量分数为50%时,油漆废渣化学链气化生成CO、CH 4和H 2的活化能分别为22.67、31.94和18.99 kJ/mol,低于未掺混Fe 2O 3的油漆废渣热解反应生成相应气体的活化能。油漆废渣中的TiO 2与反应后的Fe 3O 4停留在固体残渣中,通过磁性分离装置可对TiO 2进行回收。

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 Fe 2O 3 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 Fe 2O 3 blending ratio,the total mass loss of paint waste slag blended with Fe 2O 3 during pyrolysis and gasification is reduced.When the heating rate is 40℃/min,the maximum mass loss rate of Fe 2O 3 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 Fe 2O 3 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/m 3 when the Fe 2O 3 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/m 3)when the paint slag is pyrolyzed alone.The addition of Fe 2O 3 will reduce the low heating value of gas phase products.When Fe 2O 3 mass fraction is 50%,the activation energies of CO,CH 4 and H 2 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.TiO 2 in paint slag and Fe 3O 4 after reaction mainly stay in solid residue,which can be recovered by a magnetic separation device.