重叠式两段再生催化裂化装置的优化运行

RUNNING OPTIMIZAZTION OF FCCU WITH STACKED TWO-STAGE CATALYST REGENERATION

介绍了延安炼油实业集团公司０．８ Ｍｔ／ａ重叠式两段再生催化裂化装置的设计特点和优化运行经验。装置主风与催化剂在两个再生器之间逆流接触，增加了预提升段的长度，采用了提升管上部急冷技术，并在提升管上设有上下两组进料喷嘴。该装置的独特设计为操作者根据具体的原料性质选择合适的剂油比、反应时间等反应条件提供了更多的选择。通过不断优化反应再生部分的工艺参数，即合理分配第一、二再生器主风风量，控制再生温度，优化油剂接触，根据原料性质灵活选择不同的进料方式、剂油比以及加强再生催化剂的脱气等，在保证产品质量的前提下最大地提高了液体收率，而主风、催化剂等的消耗降到最低，同时也指出了今后进一步改进的方向。

Design features and running optimization experience of the 800000 tpy FCCU with stacked two-stage catalyst regeneration in Yan' an Petroleum Refining industry Group Company were introduced. The main air contacted with the catalyst countercurrent between two regenerators. The pre-riser was lengthened, the quenching technique was adopted in the top of the riser, and two groups of up and down feedstock nozzles were set on the riser. The unique design of the FCCU also provides operators more selections of appropriate catalyst/oil ratio and reaction time according to the practical feedstock properties. Through optimizing process parameters of both reactor and regenerator, such as rational distribution of the volumes of the main air of the first and the second regenerators, control of the regeneration temperature, optimization of oil-catalyst contact, selection of different feeding modes and catalyst/oil ratio, and strengthening degasification for regenerated catalyst, the liquid product yield can be maximally increased and the consumption of the main air and catalyst reduced to the lowest under the preconditions of guaranting the product quality. Further improvement directions were also pointed out.