摘要
在管壳式换热器和锅壳式锅炉中,大量换热管的进出口会给换热介质的流动增加很多阻力,特别是锅壳式锅炉中的烟管,由于伸出部分的冷却不够或较大的热应力(管板设计太厚),还会造成管板裂纹;不仅提高了原材料的成本,也大大增加了加工难度和费用,还给运行的安全带来隐患。根据多年的锅炉及压力容器设计经验,提出应用最大剪应力强度理论,并借鉴锅壳锅炉有关受压元件的强度计算方法和国内外化工机械的先进工艺,按等强度理论,将各种管板设计成高效分流的阶梯形等强度管板。
In tubular heat exchanger and shell boiler, large amount of inlets and outlets produce great resistance for flowing fluids. Especially in the chimney pipe in shell boiler, in view of non-enough cooling at extending part or the existence of thermal stress, crack may be formed in the tubesheet. Thus, not only will the cost of raw material increase, difficulties in fabrication will also increase. Moreover, there will be hidden dangers in performance. With author＇s experiences for many years, and based on maximum shear stress theory and equivalent strength theory, tubesheet can be designed to the one with stepping equivalent strength and high efficient separating flow.
出处
《化工设备与管道》
CAS
2013年第1期25-28,共4页
Process Equipment & Piping
