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锅炉运行中，过热蒸汽温度要求维持在允许的范围之内，尤其要求严格控制超温现象的发生。
During boiler operation superheated steam temperature must be kept in allowable IIrange and the temperature excursion must be rigidly controlled.
发生事故的主要原因之一是过热器、再热器进口集箱引入三通处蒸汽在集箱中复杂流动工况下产生涡流，处在涡流区的管屏蒸汽流量减少，使汽温和金属壁温升高。
The main source of these failures are vortices existing, in front of Tee-Junctions of entering headers of superheaters and reheaters, caused by the complex flow conditions in the headers.
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