丁烷氧化制顺酐循环流化床反应系统的温度匹配(I)反应系统模型

摘要

以VPO催化剂上正丁烷选择氧化制顺酐为例，对以变价金属复合氧化物为催化剂、按照氧化-还原机理进行的一大类烃类选择氧化反应催化循环的温度匹配问题进行了初步模拟.结果表明，使烃类选择氧化(催化剂被还原)和催化剂氧化再生分开进行，特别是根据催化剂氧化再生动力学的要求，适当调节再生过程的温度，既能明显改善反应系统的性能，又可以大幅度降低催化剂固体颗粒的循环量，取得节能降耗的效果.本文介绍模型的建立和求解方法.%An one dimensional heterogeneous model for describing selective oxidation of butane to maleic anhydride over a domestic commercial VPO catalyst in the riser of a CFB(circulating fluidized bed)system and a bubbling bed model for the regeneration of the catalyst in the fluidized bed of this CFB reactor system are developed,respectively,to preliminarily explore controlling strategy of the spatial separation catalytic cycle which combines selective oxidation of n-butane and regeneration of the catalyst.Simulation results show that based on the regeneration kinetics of the catalyst,properly raising the reoxidation temperature of the catalyst in the fluidized bed reactor either can obviously improve the performance of the system or can reduce the solid flux and hence the energy consumption.Part I of this paper presents the models of the CFB system and computation method.