绪言锅炉蒸发管的运行可靠性取决于管壁温度,而它又和管子内壁的传热系数、工质温度及热负荷有关,因此对于受到高温火焰辐射的辐射受热面必须给予特别的注意。近年来,重油锅炉数量增加,而且由于直流锅炉的广泛采用,在局部地区存在着超过极限热负荷的可能性增加,致使蒸发管过热损坏的可能性增加。作为提高极限热负荷的措施有:采用内螺纹管(把管子内壁加工成螺旋形的槽道,这是拔柏葛公司的办法)及管内加装扰流子(由薄金属制成的肋片,这是福斯特惠勒公司的办法)本文是着眼于第1种方法的研究,目的为弄清拔柏葛公司内螺纹管的作用以及查明具有其它形状内纹螺管的作用。即在方向相反的呈交叉的来福线管、及螺旋角大的单来福线管上进行低流量工 INTRODUCTION The reliability of a boiler evaporation tube depends on the tube wall temperature, which in turn is related to the heat transfer coefficient, working fluid temperature and heat load of the inner wall of the tube. Therefore, special attention must be paid to the radiant heating surface subjected to high temperature flame radiation. In recent years, the number of heavy oil boilers has increased, and due to the widespread adoption of DC boilers, there is an increased possibility of exceeding the ultimate heat load in some areas, thus increasing the possibility of overheating damage to the evaporating pipe. Measures to increase the ultimate heat load include: using a female-threaded pipe (the inner wall of the pipe is made into a spiral groove, which is a process by the company of Planck’s) and a spoiler (a fin made of a thin metal This is Forster Wheeler’s approach.) This article looks at the first approach to study the role of Brabiber’s internally threaded tubes and to identify those with other shapes of internally-threaded tubes. That is, in the opposite direction of the cross to the Fu line, and the helix angle of the single to Fu line on the low-flow workers