The regeneration riser is the downstream part of the catalyst circulation loop of methanol to olefin plant(MTO),and the complexity of its operation lies in the fact that the flow pattern of the catalyst in the riser is affected by many factors.A 600,000 t/a MTO plant has been put into operation for seven years,and there has always existed the problem of poor transportation and feeding of regeneration riser catalyst.The operating parameters of the reactor and regenerator fluctuate widely,and the process conditions are complex and changeable,so it is impossible to achieve 100％automatic control rate.The operators work hard,the product yield remains low,and the energy consumption and agent consumption are increased.According to the existing adjustment measures and temporary fault handling methods,only by adjusting the loose wind of the regeneration riser can the normal baiting of the riser be maintained for a short time.This paper analyzes the causes of the bottleneck in the production and operation of the regeneration riser from the aspects such as the influence of the upper and lower series equipment,the overall design of the regeneration riser,the fluidization state of the medium and the process operation.Hence the crux of the problem affecting the efficient operation of the regeneration riser is found and determined.According to the problem analysis and improvement suggestion,it provides reasonable theoretical support and guidance for the subsequent upgrading and reconstruction of the regeneration riser.
关键词
甲醇制烯烃/再生立管/流态/下料
Key words
methanol to olefin/regeneration riser/fluid pattern/baiting
维普
万方数据