新型菱形受热面吸热偏差的计算与分析  

Calculation and Analysis of the Thermal Deviation of a Novel Heat Transfer Surface

作　　者：王坤宇 李金波[1] 杜文静[1] 程林[1] WANG Kun-Yu LI Jin-Bo DU Wen-Jing CHENG Lin(Institute of Thermal Science and Technology, Shandong University, Jinan 250061, China)

机构地区：[1]山东大学热科学与工程研究中心,济南250061

出　　处：《工程热物理学报》2017年第10期2190-2195,共6页Journal of Engineering Thermophysics

基　　金：国家重点基础研究发展计划(No.2013CB228305)

摘　　要：基于某水泥余热集成利用技术平台,对新型菱形布置受热面作为余热锅炉过热器时的吸热偏差进行计算和分析,受热面热负荷不均是产生热偏差的主要因素。本文提出了等效吸热不均系数的概念,给出了一种受热面布置与烟气流向呈一定角度时计算吸热不均系数的数学方法,并以试验结果验证其可靠性。菱形受热面的管束布置形式可合理有效利用热能,吸热偏差为0.82~1.07,与顺排布置受热面相比体现了非常好的吸热均匀性,对于减小热偏差有较好的结构优势。The thermal deviation of a novel heat transfer surface is calculated and analyzed in a waste heat recovery boiler of a cement plant, where the heat transfer surface is used as the super heater. Uneven thermal load distribution is the main factor giving rise to thermal deviation.Equivalent coefficient of heat absorption deviation is proposed, and a mathematical method is given for calculating the thermal deviation coefficient when the tube bank has an angle with the gas flow. The results are compared with the experimental data, and a good agreement is achieved. It is proved that the special tube arrangement can efficiently utilize the thermal energy, with a low thermal deviation compared with the aligned tube arrangement. Coefficient of heat absorption deviation lies between 0.82 and 1.07, showing very good thermal uniformity as well as structural advantage.

关 键 词：余热锅炉 受热面 过热器 热偏差 热负荷分布 

分 类 号：TK124[动力工程及工程热物理—工程热物理]