D0:10.13374/.issn1001-053x.2013.07.003 第35卷第7期 北京科技大学学报 Vol.35 No.7 2013年7月 Journal of University of Science and Technology Beijing Jul.2013 燃气辐射管换热器的结构优化与数值模拟 冯俊小12)，王宏宇)☒，吴启明)，向顺华4 1)北京科技大学机械工程学院，北京1000832)北京科技大学北京市高校节能与环保工程研究中心，北京100083 3)北京京诚凤凰工业炉工程技术有限公司，北京1001764)上海宝山钢铁股份有限公司，上海201900 风通信作者，E-mail:hongyu..wang@cisdi..com.cn 摘要为解决W型燃气辐射管换热器排烟温度高的问题，设计了三种改进换热器性能的结构，采用ANSYS FLUENT 软件进行数值模拟，得到了不同结构换热器的性能参数，如烟气出口温度、空气预热温度、压力损失、各换热面换热量 和有无折流板的热阻变化.结果表明，中心空气管由一根φ79mm粗管改为六根Φ33mm细管后换热量增加了57.6%， 增设烟气双行程后换热量提高20.7%.增设密封折流板和多孔折流板后换热量分别增加了5.7%和5.3%，空气和烟气之 间的热阻都降低了20%左右.多孔折流板的烟气压力损失比密封折流板低47.4%. 关键词辐射加热：换热器：结构优化：数值分析：烟气：热阻 分类号TF066 Structural optimization and numerical simulation of gas-fired radiant tube heat exchangers FENG Jun-riao12),WANG Hong-yu1),WU Qi-ming3),XIANG Shun-hua4) 1)School of Mechanical Engineering,University of Science and Technology Beijing,Beijing 100083,China 2)Beijing Engineering Research Center for Energy Saving and Environmental Protection,Beijing 100083,China 3)CERI Phoenix Industrial Furnace Corporation,Beijing 100176,China 4)Shanghai Baosteel Group Corporation,Shanghai 201900,China Corresponding author,E-mail:hongyu.wang@cisdi.com.cn ABSTRACT In order to solve the problem of high exhaust gas temperature in W-shaped gas-fired radiant tubes, three kinds of structures were designed to improve the heat exchanger performance.Numerical simulation was carried out by using ANSYS FLUENT software.The performance parameters of heat exchangers with different structures were obtained,such as exhaust gas outlet temperature,preheated air temperature,pressure loss,heat flux in each surface, and heat resistance change with and without baffles.It is shown that the quantity of heat exchange increases by 57.6% after the central air tube changes from one tube of 79 mm to six tubes of 33 mm and by 20.7%through adding a double trip of exhaust gas.After inserting the sealed baffle and porous baffle,the quantity of heat exchange increases by 5.7%and 5.3%respectively,and the thermal resistance between air and exhaust gas decreases both by about 20%. The pressure loss of the porous baffle is lower by 47.4%than the sealed-baffle. KEY WORDS radiant heating;heat exchangers;structural optimization;numerical analysis;exhaust gases;heat resistance 热处理炉是生产高附加值金属产品不可或缺 1-习.换热器是辐射管的主要结构之一，其作用是 的设备，燃气辐射管凭借其高效和低耗的优点，近 回收烟气余热用于提高空气温度，换热器预热空气 年被广泛应用于各种热处理炉，具有广阔的市场前 温度的高低直接影响着辐射管的热效率和壁面温度 收稿日期：2012-05-12 基金项目：“十二五”因家支撑计划资助项目(2011BAE13B09)第 35 卷 第 7 期 北 京 科 技 大 学 学 报 Vol. 35 No. 7 2013 年 7 月 Journal of University of Science and Technology Beijing Jul. 2013 燃气辐射管换热器的结构优化与数值模拟 冯俊小1,2)，王宏宇1) ，吴启明3)，向顺华4) 1) 北京科技大学机械工程学院，北京 100083 2) 北京科技大学北京市高校节能与环保工程研究中心，北京 100083 3) 北京京诚凤凰工业炉工程技术有限公司，北京 100176 4) 上海宝山钢铁股份有限公司，上海 201900 通信作者，E-mail: hongyu.wang@cisdi.com.cn 摘 要 为解决 W 型燃气辐射管换热器排烟温度高的问题，设计了三种改进换热器性能的结构，采用 ANSYS FLUENT 软件进行数值模拟，得到了不同结构换热器的性能参数，如烟气出口温度、空气预热温度、压力损失、各换热面换热量 和有无折流板的热阻变化. 结果表明，中心空气管由一根 φ79 mm 粗管改为六根 φ33 mm 细管后换热量增加了 57.6%， 增设烟气双行程后换热量提高 20.7%. 增设密封折流板和多孔折流板后换热量分别增加了 5.7%和 5.3%，空气和烟气之 间的热阻都降低了 20%左右. 多孔折流板的烟气压力损失比密封折流板低 47.4%. 关键词 辐射加热；换热器；结构优化；数值分析；烟气；热阻 分类号 TF066 Structural optimization and numerical simulation of gas-fired radiant tube heat exchangers FENG Jun-xiao 1,2), WANG Hong-yu 1) , WU Qi-ming 3), XIANG Shun-hua 4) 1) School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China 2) Beijing Engineering Research Center for Energy Saving and Environmental Protection, Beijing 100083, China 3) CERI Phoenix Industrial Furnace Corporation, Beijing 100176, China 4) Shanghai Baosteel Group Corporation, Shanghai 201900, China Corresponding author, E-mail: hongyu.wang@cisdi.com.cn ABSTRACT In order to solve the problem of high exhaust gas temperature in W-shaped gas-fired radiant tubes, three kinds of structures were designed to improve the heat exchanger performance. Numerical simulation was carried out by using ANSYS FLUENT software. The performance parameters of heat exchangers with different structures were obtained, such as exhaust gas outlet temperature, preheated air temperature, pressure loss, heat flux in each surface, and heat resistance change with and without baffles. It is shown that the quantity of heat exchange increases by 57.6% after the central air tube changes from one tube of φ79 mm to six tubes of φ33 mm and by 20.7% through adding a double trip of exhaust gas. After inserting the sealed baffle and porous baffle, the quantity of heat exchange increases by 5.7% and 5.3% respectively, and the thermal resistance between air and exhaust gas decreases both by about 20%. The pressure loss of the porous baffle is lower by 47.4% than the sealed-baffle. KEY WORDS radiant heating; heat exchangers; structural optimization; numerical analysis; exhaust gases; heat resistance 热处理炉是生产高附加值金属产品不可或缺 的设备，燃气辐射管凭借其高效和低耗的优点，近 年被广泛应用于各种热处理炉，具有广阔的市场前 景[1−2] . 换热器是辐射管的主要结构之一，其作用是 回收烟气余热用于提高空气温度，换热器预热空气 温度的高低直接影响着辐射管的热效率和壁面温度 收稿日期：2012–05–12 基金项目：“十二五” 国家支撑计划资助项目 (2011BAE13B09) DOI:10.13374/j.issn1001-053x.2013.07.003