Abstract: The discrepancy between pseudo-homogeneous one-dimensional model and peeudo-homogeneous
two-dimensional model is studied. It is found that there are great differences between two
models. This paper compares the maximum and minimum values of the radial temperature in
the hot spot in came that a single exothermic reaction is carried out, a correlation is
obtlioed with peeudo-homogeneous one-dimensional model to describe the entire reactor
behavier. A new runaway criterion, based on the occurrence of inflection in the hot spot
locus, is developed for the case of pseudo-homogeneous two-dimensional model. This
criterion predicts the maximum allowable temperature for safe operation and the regions of
runaway, respectively. The calculated results show that, compared with the results based on
pseudo-homogeneous one-dimensional model, runaway will easily occur when the radial
temperature gradient has to be considered.

Key words: parametric sensitivity, runaway, fixed bed catalytic reactor

摘要： The discrepancy between pseudo-homogeneous one-dimensional model and peeudo-homogeneous
two-dimensional model is studied. It is found that there are great differences between two
models. This paper compares the maximum and minimum values of the radial temperature in
the hot spot in came that a single exothermic reaction is carried out, a correlation is
obtlioed with peeudo-homogeneous one-dimensional model to describe the entire reactor
behavier. A new runaway criterion, based on the occurrence of inflection in the hot spot
locus, is developed for the case of pseudo-homogeneous two-dimensional model. This
criterion predicts the maximum allowable temperature for safe operation and the regions of
runaway, respectively. The calculated results show that, compared with the results based on
pseudo-homogeneous one-dimensional model, runaway will easily occur when the radial
temperature gradient has to be considered.

关键词: 固定床;催化反应器;参数灵敏度;径向温度;研究模型