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针对蒸发器结垢严重及强制循环泵能耗高的问题,提出了一种用于自然循环蒸发器加热管内往复螺旋在线清洗技术,依靠气液两相流速度场的脉动实现工作螺旋轴向往复振动实现均匀防、除垢.以水为实验介质,设计了6根加热管的常压蒸发实验台,用不同往复弹簧和工作螺旋组成的清洗装置进行了实验,并在优化参数下得到了工作螺旋轴向往复行程、循环流速与传热温差的关系.结果表明,加热管规格为外径38mm、壁厚2mm、管长2m的常压蒸发条件下,往复弹簧弹性系数K=7.0～8.0N/m、工作螺旋螺距与管内径比为0.676～0.764且传热温差大于18℃时,系统循环流速不低于0.57m/s,工作螺旋往复行程稳定大于一个螺距,满足均匀除垢需求.
Aiming at the problem of serious scaling of the evaporator and high energy consumption of the forced circulation pump, a reciprocating helical on-line cleaning technology is proposed for the natural circulation evaporator, which relies on the pulsation of the gas-liquid two- Vibration to achieve uniform anti-scaling and descaling.With water as the experimental medium, six heating tubes were designed for atmospheric pressure evaporation and the experiments were carried out with cleaning devices with different reciprocating springs and working screws, and the work was done under the optimized parameters Screw reciprocating stroke, circulating velocity and heat transfer temperature difference.The results show that the elastic coefficient of the reciprocating spring under the atmospheric pressure evaporation condition with the outer diameter of 38mm, the wall thickness of 2mm and the tube length of 2m is K = 7.0 ~ 8.0N / m, the working helical pitch to the tube diameter ratio of 0.676 ~ 0.764 and the heat transfer temperature greater than 18 ℃, the system circulation flow rate of not less than 0.57m / s, work spiral reciprocating stroke stability greater than one pitch, to meet the uniform descaling needs.