换热管外壁的水膜在空气中蒸发时碳酸钙污垢生长特性的研究  

Research on Growth Characteristics of Calcium Carbonate Fouling When Water Film on the External Surface of Heat Exchange Tube Evaporates in the Air

作　　者：许隽杰 章立新[1] 赵彦 刘津 赵圣仙 高明[1] 陈永保[1] 刘婧楠[1] XU Junjie;ZHANG Lixin;ZHAO Yan;LIU Jin;ZHAO Shengxian;GAO Ming;CHEN Yongbao;LIU Jingnan(Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering,School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Shanghai ATRA Group Co.,Ltd.,Shanghai 201814,China)

机构地区：[1]上海理工大学能源与动力工程学院,上海市动力工程多相流动与传热重点实验室,上海200093 [2]上海安得利节能科技集团股份有限公司,上海201814

出　　处：《动力工程学报》2022年第8期701-706,共6页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(51976127)。

摘　　要：为研究换热管外壁污垢的生长特性,搭建了模拟换热管外壁水膜在空气中蒸发的实验装置。在不同喷淋水质量浓度和气水流向下研究了污垢热阻的变化,并对污垢进行了电镜形貌分析。结果表明:在横流状态下污垢生长最快;在低喷淋水质量浓度时气水流向对污垢热阻的影响较大;随着喷淋水质量浓度的增大,气水流向对污垢生长的影响逐渐减小;污垢晶型呈典型方解石特征,少数污垢呈团聚状态,而多数污垢呈零散状态,说明污垢的生长是沉积和脱除的叠加过程。In order to study the growth characteristics of fouling on the external surface of heat exchange tubes, an experimental device was built to simulate the evaporation of water film on the external surface of heat exchange tubes in the air. The variation of fouling resistance was studied under different spray water mass concentrations and air water flow directions, and the morphology of fouling was analyzed by electron microscope. Results show that the fouling grows fastest under the cross flow mode. The air water flow direction has a great influence on the fouling resistance at low spray water mass concentration. With the increase of spray water mass concentration, the effect of air water flow direction on the growth of fouling decreases gradually. The crystal form of fouling is typical calcite, a small amount of fouling is in agglomerated state, while most fouling is in a scattered state, indicating that the growth of fouling is a superposition process of deposition and removal.

关 键 词：碳酸钙污垢 换热管 喷淋水 蒸发 污垢热阻 晶体形貌 

分 类 号：TK172[动力工程及工程热物理—热能工程]