摘要
为研究水平管内凝结传热特性,对蒸汽与氮气混合物在水平管内膜状凝结过程进行了实验,实验工况为蒸汽压力0.7 MPa,入口不凝气体质量分数0~10%,冷水质量流量2500~4000 kg/h。分析了蒸汽压力、冷水质量流量和不凝气体质量分数对蒸汽凝结传热特性的影响,并基于蒸汽与氮气混合物水平管内凝结时的实验数据,拟合了准则关联式。结果表明:随着不凝气体质量分数的增加,汽侧平均凝结传热系数、出口凝液平均质量流量、汽侧进出口平均压损均不同程度减少,抑制了蒸汽凝结;随着冷水质量流量增加,冷凝温差增大,有助于促进蒸汽凝结;实验数据与其拟合的准则关联式吻合较好,95%的数据点都是在±15%的误差范围内。
In order to investigate the condensation heat transfer characteristics inside the horizontal pipe,the film condensation process of steam and nitrogen mixture inside the horizontal pipe was carried out experimentally under the conditions of the steam pressure 0.7 MPa,mass fraction of noncondensable gas 0~10%,and mass flow rate of cold water 2500~4000 kg/h.The effects of steam pressure,cold water mass flow rate and noncondensable gas mass fraction on steam condensation heat transfer characteristics were analyzed.Moreover,a criterion correlation based on the experimental data of steam and nitrogen mixture condensation inside the horizontal tube was fitted.The results show that the average condensation heat transfer coefficient,the average outlet condensate mass flow rate and the average pressure loss between inlet and outlet of the steam side all decrease with the increase of the noncondensable gas mass fraction to varying degrees,which restrains the condensation of the steam.However,with the increase of cooling water mass flow rate,the condensation temperature difference increases,which is helpful in promoting steam condensation.Additionally,the experimental data are in good agreement with the criterion correlation.95%of the data points are within the error range of±15%.
作者
温建军
葛剑英
WEN Jian-jun;GE Jian-ying(Institute of Energy and Environment,Inner Mongolia University of Science and Technology,Baotou,China,014010)
出处
《热能动力工程》
CAS
CSCD
北大核心
2020年第11期106-113,共8页
Journal of Engineering for Thermal Energy and Power
基金
内蒙古自治区自然科学基金(2017MS0510)
内蒙古科技大学创新基金(2016QDL-B24)。
关键词
水平管
蒸汽凝结
不凝气体
强化机理
准则关联式
horizontal tube
steam condensation
noncondensable gas
strengthening mechanism
criterion correlation
