对管式换热器黏液形成菌生物污垢特性的实验研究  

Experimental Study of the Bio-foul Characteristics of Bateria Formed in Viscous Liquids Inside a Tubular Type Heat Exchanger

作　　者：徐志明[1] 王宇航[1] 沈艺雯 王景涛[1] 

机构地区：[1]东北电力大学能源与动力工程学院,吉林吉林132012

出　　处：《热能动力工程》2016年第9期39-44,132,共6页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金资助项目(51476025)

摘　　要：为了探讨黏液形成菌在管式换热器中的污垢特性,以某电厂循环冷却塔塔底黏泥中分离纯化后得出的黏液形成菌为研究对象,利用污垢动态模拟实验系统,采用对比实验的研究方法得到了不同入口温度、流速及体积浓度条件下黏液形成菌在不锈钢光管换热器中的污垢特性。结果表明:黏液形成菌的结垢过程存在诱导期。随着入口温度的升高,诱导期缩短,污垢热阻达到渐近值所需时间减少。在实验温度范围内,入口温度为30℃时污垢热阻渐近值最大,35℃时次之,25℃时最小;随着流速的增加,污垢热阻达到渐近值所需时间减少,污垢热阻渐近值减小;随着体积浓度的增加,诱导期会延长,结垢速率加快,污垢热阻渐近值增大。To exploratorily investigate the foul characteristics of bacteria formed in viscous liquids inside a tubular type heat exchanger,with the bacteria formed in viscous liquids obtained from the slime at the bottom of the circulating cooling towers in a power plant after the separation and purification serving as the object of study,a foul dynamic simulation and test system was utilized and a contrast test research method was adopted to obtain the foul characteristics of bacteria formed in viscous liquids in a stainless steel bare tube heat exchanger under the condition of various inlet temperatures,flow speeds and volumetric concentrations. It has been found that there exists an induction period in the fouling process of bacteria formed in viscous liquids. With an increase of the temperature at the inlet,the induction period will become shortened and the time duration required by the foul thermal resistance to attain its asymptotic value reduced. In the range of the temperature tested,when the temperature at the inlet is 30 ℃,the asymptotic value of the foul thermal resistance will be maximum followed by the asymptotic value at 35 ℃ and minmum at 25℃. With an increase of the flow speed,the time duration required by the foul thermal resistance to attain its asymptotic value will become shortened and the asymptotic value of the foul thermal resistance will decrease. With an increase of the volumetric concentration,the induction period will become prolonged,the fouling speed rate will increase and the asymptotic value of the foul thermal resistance will become big.

关 键 词：管式换热器 污垢特性 黏液形成菌 生物膜 酶 

分 类 号：TK172[动力工程及工程热物理—热能工程]