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;
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。
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.
安徽绩溪化肥厂应用全低变工艺后解决了系统不匹配问题，降低了系统压力，同时取得了节能增产的效果。
Anhui Jixi County Chemical Fertilizer Plant adopts the all LTS process to solve its problem of mismatch, reduces the system pressure and obtains the result of energy saving and output increase.
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