The process to replace the catalyst of shifting furnace was introduced for large-sized ammonia synthesis plant;
介绍了大型合成氨厂低变炉更换催化剂的过程； 论述了催化剂的选型要求和装填方法；
The process to replace the catalyst of shifting furnace was introduced for large-sized ammonia synthesis plant; the requirements of type selection and filling method for catalyst were discussed.
介绍了大型合成氨厂低变炉更换催化剂的过程；论述了催化剂的选型要求和装填方法；阐明了催化剂还原过程中从还原前升温到还原初期、主期及末期的操作步骤和要求。
Structure of several types of gas mixer for secondary reformer are described in the paper. It can be used as a reference in the revamping of ammonia and synthesis gas plant.
分析二段转化炉在工业生产中所采用的几种气体混合器结构形式，为提高二段炉的生产能力，增产氨或甲醇合成气的技术改造提供参考。
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