焦油热解反应模拟研究

Simulation study on tar pyrolysis reaction

为了考察焦油的热解情况,基于芳香族化合物的热解反应及其动力学参数,构建以萘、甲苯、苯酚的混合物作为焦油模型化合物的热解模型,考察温度、压力、停留时间以及气氛对焦油热解过程的影响。结果表明,随着温度、停留时间以及压力的增加,焦油热解的转化率呈现不同程度的增加。在 900~1 100 ℃之间,焦油转化速率基本恒定;停留时间达到 6 s、压力增至 1 MPa 以后,焦油转化速率逐渐降低。不同的反应气氛对焦油热解过程也有着不同影响,CO2 和水蒸气对焦油热解过程有着促进作用,水蒸气的促进作用更加显著,且水蒸气对抑制积炭形成有着显著效果;CO 对焦油热解过程影响很小;H2对焦油热解过程有抑制作用。

In order to study tar pyrolysis processes, a model mixture composed of naphthalene, toluene and phenol was used based on the pyrolysis reaction and kinetic parameters of aromatic compounds, and the effects of temperature, pressure, residence time and different atmosphere on tar pyrolysis were investigated. The results indicate that the conversion rate increases with the increase of temperature, pressure and residence time. The conversion keeps stable at 900~1 100 ℃. When the residence time is 6 s and the pressure increases to 1 MPa, the conversion gradually decreases. In addition, different reaction atmosphere also had different effects on tar pyrolysis. Both CO2 and steam have an enhancing effect on tar pyrolysis, in which steam shows more significant promotion effects. Moreover, steam has a significant effect on inhibiting the formation of carbon deposits. CO has little effect on tar pyrolysis and H2 has an inhibitory effect.