管外水冷设备污垢河沙循环流动流态化快速冲洗技术

The rapid cleaning technology of circulating fluidization in shell side of water cooling equipments

立式传热设备壳程清洗困难。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。采用色水法对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;清洗气体的消耗量计算式为23.8(D2-Nd2);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。

It is difficult to remove of shell side in vertical shell-tube heat exchangers. Based on this, an online cheaning technology has been developed which utilizes the internal circulation of three-phase fluidization that flows in the opposite two directions by turns driven by feeding air. A large vertical pesiglass experimental set is designed and built which has 40 heat transfer tubes of φ32 mm×3 mm×2000 mm. The speed field in cross section at different depth was tested through color water. The experiments show that the three-phase fluidization can be produced in the area of 2～3 tube layers of each side with one tube of air holes. The amount of needed air Q is calculated through the equation Q=23.8（D^2-Nd^2） ,the feed air pressure is equal to 1.1 times static pressure of shell-side liquid. Using this cleaning technique, not only the structure simple, there is no extra cost,the operation is convenient and the cleaning cost is low; but also fouling can be removed evenly and quickly without any pollution.