蒸汽锅炉按照水或水蒸气循环的动力的不同分为：自然循环锅炉，控制循环锅炉，直流锅炉和复合循环锅炉，后三种锅炉有统称为强制循环锅炉。
在大容量、亚临界自然循环锅炉蒸发系统设计中，有时不可避免地需要部份地采用价格昂贵的内螺纹管，以避免出现膜态沸腾。
In evaporating system design of large subcritical pressure natural circulation boiler sometime expensive rifled tube will be used unavoidably in part, so that the film boiling Can be avoided.
根据锅炉启动过程中各个部件管内工质、管外烟气及汽包所遵循的流动传热方程，开发了控制循环与自然循环锅炉启动过程模拟程序。
A computer program is developed to simulate the start-up behavior of controlled-circulation and natural-circulation boilers on the basis of mass, momentum, and energy equations.
本文详细介绍了300mw亚临界压力自然循环燃煤锅炉。
The 300mw subcritical pressure natural circulation boiler fired coal is described in detail.
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