锌对焦炭热性能和气化反应动力学的影响

Effect of zinc on thermal properties and gasification kinetics of coke

采用液相吸附法研究了锌对焦炭反应性和反应后强度的影响,并结合热重法和第一性原理探讨了锌对焦炭气化反应动力学的影响.研究结果表明,锌对焦炭的气化反应具有催化作用,随着锌吸附量的增多,对气化反应的催化作用加强,在锌吸附量(质量分数)达到1.15%~1.17%后,焦炭反应性变化趋势变得平缓,锌吸附量的进一步增大对焦炭反应性的影响不大.采用非等温法研究了锌对焦炭气化反应行为的影响,结果表明在锌吸附量逐渐增多的情况下,焦炭气化反应向低温区移动,焦炭在低温区的反应活性增强,反应速率极值点左移.锌在焦炭气化反应中可以降低酮基分解所需的能量,加快CO的形成,从而加速反应的进行.

The influence of zinc on the coke reactivity and coke strength after reaction was studied by liquid-phase adsorption method, and the effect of zinc on the kinetics of coke gasification reaction was discussed by combining thermogravimetric method and first principles. The results show that zinc has a catalytic effect on the gasification reaction of coke. With the increase of the adsorption amount of zinc, the catalytic effect on gasification reaction is strengthened. When the adsorption amount of zinc reaches 1.15%~1.17%(mass fraction), the change trend of the coke reactivity becomes gentle, and the further increase in adsorption amount of zinc has little effect on the coke reactivity. The influence of zinc on the reaction behavior of coke gasification was studied by non-isothermal method. The results show that the coke gasification reaction moves to the low-temperature zone when the amount of zinc adsorption gradually increases. The reaction activity of coke in the low-temperature zone is enhanced, and the extreme point of the reaction rate moves to the left. Zinc can reduce the energy required for ketone decomposition and accelerate the formation of CO in coke gasification reaction, resulting in accelerating the reaction.