燃气管道传热特性数值研究  

Numerical study on heat transfer characteristics of gas pipeline

作　　者：刘秀云[1] 

机构地区：[1]长江大学石油工程学院,湖北武汉430100

出　　处：《能源与环保》2017年第7期137-142,147,共7页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

摘　　要：为了研究高温燃气管道管壁的传热特性,利用有限差分法对管壁进行二维数值研究。采用不同的换热边界条件和管壁材料(分别为铜、钢、哈氏合金3种材料)进行计算对比,获得管壁温度随时间变化规律及管壁传热特性。结果表明:高温燃气通道在高温燃烧之后,燃烧室内的热量从内壁面到外壁面,随时间层层向外传递;不同的管壁材料,传热过程区别也很大,管壁材料的导热系数越大,传热速率越快,管的外壁面越容易达到稳定状态;燃气通道管壁的传热情况受到外界与壁面之间的对流换热系数的影响,管外对流介质与管壁的对流换热系数越大,它们之间的传热效率越高,有利于管壁冷却,管壁温度达到平衡状态需要的时间越长,最终外壁面平衡温度随着对流换热系数的增大而降低;连续性高温燃气流通过程,在燃气管道管内壁面上产生较为稳定边界条件,管壁持续承受高强度热量,采取有效冷却措施来延长管道的使用寿命。通过传热分析,采用有效的冷却循环系统来提高高温燃气的利用率和余热的回收。In order to study the heat transfer characteristics of high temperature gas pipeline wall,using the finite difference method for the two-dimensional numerical study on the gas pipeline wall. Through the calculation contrast of different heat transfer boundary conditions and pipe wall material（ respectively,copper,steel,hastelloy alloy three materials）,change regulation of tube wall temperature and the heat transfer characteristics were obtained. The results showed that high temperature gas passages were heated at high temperatures,the heat from the combustion chamber wall surface to the outer layers of the wall to pass out over time,for different wall materials,heat transfer process was also a great difference,the greater the coefficient of thermal conductivity of the tube wall materials,the faster the heat transfer rate,and the tube outer wall more easily reached a steady state; gas channel wall heat transfer situation affected the convective heat transfer coefficient between the wall and the outside world,the bigger the tube outer convection media convection convective heat transfer coefficient and the wall heat transfer coefficient,the higher the heat transfer efficiency,the more conducive to the cooling of the tube wall,and the tube wall temperature reached the equilibrium state needs the longer time. Finally,the outer surface equilibrium temperature decreased with the increase of convective heat transfer coefficient. Continuity of the high temperature gas circulation in the inner wall surface of the gas pipeline to generate more stable boundary conditions,wall sustainability of high intensity heat,cooling to take effective measures to improve the life of the pipeline. By analysis of heat transfer,taking effective measures can increase the pipe life,at the same time,to improve the utilization rate of high temperature gas and recover waste heat.

关 键 词：高温燃气管道 传热特性 有限差分法 数值研究 二维温度场 

分 类 号：TK172.4[动力工程及工程热物理—热能工程]