700℃超超临界锅炉热偏差与流量偏差对壁温特性影响的研究  

Study on the Effect of Hydrodynamic and Thermal Deviation on Wall Temperature of 700 ℃ Ultra Supercritical Boiler

作　　者：商显耀 张忠孝[1] 范浩杰[1] 董建聪[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《锅炉技术》2016年第5期1-5,63,共6页Boiler Technology

基　　金：国家自然基金项目(U1361201);国家863计划项目(2012AA050502)

摘　　要：采用燃烧与水动力耦合传热模型,通过壁温安全边界条件以及水动力约束条件,研究了无偏差以及分别存在热偏差和流量偏差时的水冷壁壁温分布规律。结果表明:在700℃、35 MPa超超临界参数下,无偏差时水冷壁壁温最大值为619℃;火焰中心偏移3m时,壁温最大波动为32℃;流量偏差-30%时,最大壁温为650℃。为保证5%设计安全裕度,应保证火焰中心偏移最大位置不超过3m;工质流量偏差不超过30%。The coupling heat transfer model of combustion and hydrodynamic was adopted to calculate wall temperature distribution under conditions of with and without thermal and hydrodynamic deviation by means of security boundary condition and hydrodynamic constraint condition. The results show that under condition of 700 ℃, 35 MPa, the maximum wall temperature is 619 ℃ when there is no deviation; the maximum wall temperature deviation is 32 ℃ when the offset of flame center is 3 m; the maximum wall temperature is 650 ℃when the flow deviation is 30%. The offset of flame center should never exceeds 3 m and flow deviation never exceeds 30% for safety consideration.

关 键 词：燃烧与水动力耦合传热 热偏差 流量偏差 水冷壁壁温 

分 类 号：TK229.2[动力工程及工程热物理—动力机械及工程]