关键词:

丙烷脱氢, 烧焦, 催化剂再生, 非均相, 数学模型

Abstract:

In propane dehydrogenation to propene, the catalyst is continuously deactivated owing to coke formation, which needs to be burnt off periodically to regenerate the catalyst.In this paper, an effectiveness factor modified coke burning-off model was used and a dynamic heterogeneous model for the reactor was established, which took into consideration the pore and film diffusion effects.Simulation study showed that there was a large temperature difference between gas and solid.At the beginning of coke burning-off, because the accumulation of reaction heat, the temperature of solid increased rapidly, which was more obvious near the inlet of the reactor.The temperature quickly decreased to the same temperature with gas when the carbon burning was close to completion.Coke burning-off gradually advanced along the bed, and the hot spot of the bed also gradually advanced from inlet to outlet.The hot spot temperature had little change in different bed position.

Key words:

丙烷脱氢, 烧焦, 催化剂再生, 非均相, 数学模型