阐述了二段炉出口甲烷含量升高的原因，认为是二段炉空气分布器所致。
The reason of increasing methane content at outlet of secondary reformer is described; Author thinks that its reason is caused by the secondary reformer air distributor.
UHDE型二段转化炉由于空气分布器的局部损坏，导致二段炉锥体耐火衬里的冲蚀。
The air distributor of UHDE Secondary reformer was partly destroyed, resulting in the erosion of the cone refractory liner of the Secondary reformer.
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。
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.
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