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根据粒内外速率过程相互作用的观点,提出了一个新的、更一般化的喷淋床反应器的接触效率表达式。对等温一级反应,接触效率η_c=(ε_pSh)/Sh~*=(3ε_pk_sd_p)/(2DΦ~2η),当ε_pSh>Sh~*时,η_c=1。把接触效率表达式引入到修正活塞流准均相模型中得到的新的喷淋床反应器模型,不仅能概括Henry模型、Mears模型、Colombo模型和Bondi的经验模型及满意地解释Morita等的新近实验结果,而且消除了上述各模型与某些实验事实相矛盾的缺点。新的接触效率表达式,使利用现有的液固传质关联和粒内扩散反应问题的研究成果正确地予测接触效率有了可能。
A new, more generalized contact efficiency expression for a trickle-bed reactor is proposed based on the interaction of the internal and external rate processes. For the isothermal first-order reaction, the contact efficiency η_c = (ε_pSh) / Sh ~ * = (3ε_pk_sd_p) / (2DΦ ~ 2η). When ε_pSh> Sh ~ *, η_c = 1. The introduction of the contact efficiency expression into the new trickle bed reactor model from the modified plug flow quasi-homogeneous model not only provides an overview of the Henry model, the Mears model, the Colombo model, and the Bondi empirical model, but also satisfactorily explains Morita et al. Experimental results, but also eliminates the shortcomings of the above models contradictory to some experimental facts. The new contact efficiency expression makes it possible to predict the contact efficiency correctly using existing liquid-solid mass transfer correlation and intragrain diffusion reaction studies.