MTO装置再生立管内催化剂输送不畅的流态特性分析

甲醇制烯烃（MTO）装置催化剂循环回路的下行流动部分是再生立管，再生立管将催化剂从再生器输送至反应器是保证MTO装置正常运行的前提条件。某0.60 Mt/a MTO装置再生立管出现催化剂输送不畅问题已成为装置高效运行的瓶颈，为此通过测量再生立管的轴向压力分布和工艺参数分析催化剂输送不畅的原因。结果表明：由于催化剂脱气和大气泡，再生立管中催化剂从上至下形成了过渡填充流、段塞流和密相流化流，导致催化剂浓度和催化剂循环量大幅度波动。最后，根据分析结果提出了再生立管结构改造的建议。

ANALYSIS ON FLUIDIZATION CHARACTERISTICS OF CATALYST WITH POOR TRANSFER IN REGENERATOR STANDPIPE OF MTO UNIT

The down-flow part of the catalyst circulation loop in methanol to olefin (MTO) unit is the regeneratr standpipe, which is the precondition to ensure the normal operation of the MTO unit. It has become the bottleneck of the high efficient operation of the regenerator standpipe of a 0.60 Mt/a MTO unit that the catalyst transfer is not smooth. So the reasons of the catalyst transfer were analyzed by measuring the axial pressure distribution and process parameters of the regenerator standpipe. The results show that due to the degassing of the catalyst and the large gas bubbles, the flow patterns of transition filling flow, slug flow and dense-phase flow are formed from top to bottom in the fluidized state of catalyst transfer in the regenerator standpipe, leading to the content of catalyst and the amount of catalyst cycle fluctuating greatly. Based on the analysis results, some suggestions were proposed for structural modification of regenerator standpipe.