【作者】 张恒；

【导师】 张少峰；

【作者基本信息】 河北工业大学 ， 化工过程机械， 2008， 硕士

【摘要】 换热设备的防、除垢问题是学术界及工业界普遍关注的课题。将多相流态化技术引入防、除垢过程,通过在换热装置中加入一定种类、浓度、粒径的惰性固体颗粒的方法来达到防、除垢和强化传热的目的,取得了显著的效果,具有广阔的应用前景。本文对水平管液固循环流化床换热器的防、除垢和强化传热性能进行了研究,考察了操作参数对其防除垢和强化传热的影响,提出了最佳工艺条件,并利用Matlab语言实现了数据的可视化。实验结果表明,惰性固体颗粒的加入不仅大大地延缓了结垢,达到了防除垢的目的,而且强化传热效果显著。加入固体颗粒体积分率越大,强化传热效果越明显;颗粒循环流量越大传热系数越高;热通量大时传热效果好。最后通过建立线性回归模型,得出了水平流化床换热器膜传热系数及压降关联式,以指导工程实践。更多还原

【Abstract】 There is a common focus on the subject of preventing and removing the foulings in heat exchanger in the field of academia and industry. Multi-phase fluidization technique has been used in the process of preventing and removing the fouling. Inert solid particles were added to the heat exchanger in order to preventing and removing foulings and enhancement heat transfer, which has remarkable effect and can be applied widely.Focal point of this text was studying the influence of the capability of preventing and removing fouling and enhancing the heat transfer in a horizontal liquid-solid circulating fluidized bed heat exchanger. The capability of preventing and removing fouling and enhancing the heat transfer were reviewed, moreover the optimum operating conditions were proposed. Experimental data had been visualized by using Matlab software. The experimental results show that the fouling can be prolonged for adding particles, and solid particle can prevent fouling and enhance heat transfer. The more adding particles, the better heat transfer effect was. The heat transfer effect was better in high speed than low speed with adding particles. The coefficient of heat transfer increased with the heat flux. In the last, the mathematical model of horizontal fluidized bed heat exchanger was induced, by setting up linearity regression model, which can be applied to engineering.更多还原