毕业设计--蒸汽发生器传热管结构设计

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1、蒸汽发生器传热管结构设计 I 摘 要 本文 首先 对蒸汽发生器的形式进行了选择 ， 经过对比 ， 将自然循环形式的蒸汽发生器作为本次设计的主体 。 接着 通过 已给定的 原始数据、 进行 传热计算、 并恰当的 选择传热管内外径和 最后确定 k 值 并 计算出传热面积。然后通过蒸汽产量和传热管内径，确定了传热管根数。接下来进行传热管结构设计 ，本次设计使用的是正方形排布，因为管束较多，根据经验应该排布为圆形，传热管之间的距离唯一。 根据排管结束后可以得出的蒸汽发生器和 U 型管的相关尺寸数据，进行了水力计算其中包括一回路的 U 形管内摩擦阻力计算、一回路水局部阻力计算；二回路 的下降空间阻力计算

2、、上升空间阻力计算；选取适当的汽水分离器阻力。从而得出循环总阻力然后确定预热段高度并进行运动压头的计算，然后通过画图得出最佳循环倍率。 关键词 自然循环蒸汽发生器，三角形布置，结构设计 沈阳工程学院毕业设计（论文） II Abstract First, the choice of the steam generator in the form of the design choices, by comparison, the natural circulation steam generator. Subsequently endorsed by the original data, heat

3、 transfer calculations, select the appropriate heat transfer tube outer diameter and determine the fixed value of k to calculate the heat transfer area. Steam production and heat transfer tube diameter, to determine the heat transfer tubes of the root number. Next, we should do structural design wit

4、h heat transfer tubes。 In this design， we used square layout。 Because the number of heat transfer tubes is very huge.So we have to arranged them in a circular based on experience .And the distance between heat transfer tubes is only. According to the steam generator can be drawn after the end of the

5、 pipe and U-tube size data, the hydraulic calculation of the U-shaped tube including a loop within the frictional resistance, the local resistance of a circuit water； falling space of two loop resistance calculation of room for growth resistance calculation； select the appropriate soda separator resistance. To arrive at the total loop resistance and then determine the preheating section height and movement of pressure head calculation, and then obtained by drawing the best circulation ratio. Key word Natural circulation steam generator, Square layout, Structural design