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现代高参数大容量火电锅炉，水冷壁的高温区都采用内螺纹管以防止水与管壁之间形成蒸汽膜，降低传热效率。内螺纹管的螺纹头数根据设计需要有８、１２和１４头不等。内螺纹的旋转方向可分单向和正反交叉两种，形式很多，各国尚无统一标准。国产１０５０ｔ／ｈ锅炉（配３００Ｍ?
Modern high-parameter large-capacity thermal power boiler, the wall of the high temperature water pipe are used to prevent the formation of the inner wall of the pipe between the film and steam to reduce heat transfer efficiency. Threaded pipe thread number according to the design needs of 8,12 and 14 head range. The direction of rotation of the internal thread can be divided into two kinds of one-way and positive and negative cross, many forms, there is no uniform standard in various countries. Domestic 1050t / h boiler (with 300M?