熔融盐在蓄热混凝土中传热过程的数值模拟  

Numerical simulation of the heat transfer process of the molten salt in heat storage concrete

作　　者：周卫兵[1] 蔡凡凡[1] 朱教群[1] 孙正[1] 荆汝林 

机构地区：[1]武汉理工大学材料科学与工程学院,湖北武汉430070 [2]中广核太阳能开发有限公司,北京100048

出　　处：《节能》2013年第12期7-11,2,共5页Energy Conservation

基　　金：国家科技支撑计划(项目编号:2012BAA05B06;2012BAA05B03);武汉市科技攻关项目(项目编号:20120321094)

摘　　要：用数值模拟的方法对熔融盐与蓄热混凝土组合式换热模型进行了研究．该组合模型以混凝土为蓄热介质，熔融盐（Hitec）为传热介质，分析混凝土的导热系数、流体管道长度、热流体进口温度与进口流速等因素对蓄热单元储热规律及其特性的影响。计算结果表明：当混凝土的导热系数在2．0～3．0W/（m·K）左右、管长为0．5—2m、热流体进口温度为420℃、进口流速为O．15～0．25m／s时，蓄热单元可获得较高的储热效率。The combined heat exchange model of the molten salt and heat storage concrete is established. Using numerical simulation method and Fluent software,the influence of the thermal conductivity of the concrete,fluid pipe geometry,thermal fluid inlet temperature and inlet velocity and other factors on the thermal storage law and its characteristics of the thermal storage unit is analysised. The conclusion of numerical computation is given as follows: when the thermal conductivity of the concrete is 0. 25W /( m·K) or so,the tube length is 2m,the heat transfer medium inlet temperature is 420℃,the inlet velocity is 0.25m / s,the heat storage unit can obtain higher storage efficiency.

关 键 词：混凝土 熔融盐 复合蓄热 数值模拟 FLUENT 

分 类 号：TK513.5[动力工程及工程热物理—热能工程]