CO_2水合物浆在水平圆管中的传热特性  

Heat transfer characteristics of CO_2 hydrate slurry in horizontal circular tube

作　　者：刘妮[1] 由龙涛[1] 张亚楠[1] 柳秀婷[1] 

机构地区：[1]上海理工大学能源与动力工程学院,上海200093

出　　处：《化工进展》2015年第1期69-74,共6页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(50706028);上海市教委科研创新项目(12YZ106)

摘　　要：在CO2水合物浆流动传热特性测试实验系统上,采用套管式电加热的方法对CO2水合物浆进行了分解实验,并对CO2水合物浆的流动传热特性进行了分析。对CO2水合物浆的相变特性进行了研究,得到CO2水合物浆的相变温度在8--12℃。研究了在固相体积分数为13.2%以及流速为0.45m/s的条件下CO2水合物浆在内径为8mm的水平不锈钢管中的传热特性,计算得到CO2水合物浆在不锈钢水平圆管中的对流传热系数为1500--1800W/（m2·K）,并且其在流动传热过程中呈现先增大随后趋向平稳的趋势,在水合物的相变区相应的对流传热系数表现最大。研究了分解加热功率对管壁温和对流传热系数的影响,发现加热功率对管壁温度的影响较强。在实际应用中可利用CO2水合物浆的相变作用来增强传热,提高传热效率。The flow and heat transfer characteristics of CO2 hydrate slurry in horizontal circular tube was studied experimentally. The dissociation properties of CO2 hydrate slurry was investigated using the electric heating water around the tube method. The analysis of phase transition and heat transfer characteristics of CO2 hydrate slurry indicated that the phase transition temperature of CO2 hydrate slurry was at 8—12℃. The heat transfer characteristics of CO2 hydrate slurry with 13.2%（vol） solid fraction in a 8 mm straight stainless steel horizontal circular tube were studied at the flow rate of 0.45 m/s in a dynamic loop. The corresponding local convective heat transfer coefficient in horizontal circular tube increased and then stayed constant and the range was calculated to be 1500—1800 W/（m2·K）. The results showed that the largest corresponding convective heat transfer coefficient appeared in the phase transition field of CO2 hydrate slurry. The influences of heating power on tube wall temperature and the convective heat transfer coefficient were discussed respectively. It was discovered that the heating power had a strong effect on wall temperature. The phase transition effect of CO2 hydrate slurry can be used to enhance the heat transfer and increase the heat transfer efficiency in related applications.

关 键 词：二氧化碳 水合物浆 传热 相变 

分 类 号：TQ031[化学工程]