【摘要】 提出了分区切换送气形成正反方向交替的、内循环流动的三相流态化的在线清洗方法,并且用有机玻璃建造了由40根32mm×3mm×2000mm传热管组成的大型立式试验台。采用色水法其不同深度的截面速度场进行试验观测。结果表明:一根布气管可以带动每侧的2~3排传热管区域的流态化清洗;清洗气体的压力为壳程液体静压的1.10倍。这种清洗技术不仅结构简单,设备费用几乎不增加,操作方便,清洗费用低廉,而且污垢清洗均匀性好,速度快,无污染。更多还原

【Abstract】 It is quite difficult to remove fouling on the shell side in vertical shelltube heat exchangers. An online cleaning technology was developed which utilizesd the internal circulation of threephase fluidization that flow in two opposite directions by turns driven by feeding air. A large vertical plexiglass experimental set was designed and built with 40 heat transfer tubes of  32 mm×3 mm×2 000 mm. The speed field in crosssection at different depths was tested with colored water. The experiments showed that threephase fluidization could be generated in the area of 23 tube layers of each side with one tube of air holes. The amount of air required Q was calculated with the equation Q =23.8( D 2- Nd 2), the feed air pressure was equal to 1.1 times static pressure of shellside liquid. Using this cleaning technique, not only the structure was simple, there was no extra cost, the operation was convenient and the cleaning cost was low; but also fouling could be removed uniformly and quickly without any pollution.更多还原