【摘要】 螺旋翅片管束是余热锅炉中重要的余热利用装置。为了探究操作条件对翅片管束换热性能的影响，研究了入口烟温、烟气流速、冷却水流量对一种新型结构翅片管——倒齿形螺旋翅片管束换热及阻力特性的影响。试验结果表明，倒齿形螺旋翅片管束的总换热量随着入口烟气温度、烟气流速和冷却水流量的提高而增大。当烟气温度从250℃提高到350℃,总换热量提高了约64%;当烟气流速由8 m/s提高到16 m/s时，努赛尔数(N_u)增大了约40.5%,冷却水流速升高对总换热量提升2.9%左右。此外，试验结果显示，烟气温度和冷却水流速对于欧拉数(E_u)的影响均较小。新型倒齿形螺旋翅片管束可提高高温烟气的余热利用率，节省天然气能源，提高联合循环电站的经济效益。该试验结果可为后续实际工程应用提供参考。更多还原

【Abstract】 Spiral finned-tube bundles are important for waste heat utilization devices in waste heat boilers. In order to explore the influence of operating conditions on the heat transfer performance of the finned-tube bundles, the effect of inlet flue gas temperature, flue gas flow rate and cooling water flow rate on the heat transfer and pressure drop characteristics of novel finned-tubes, the serrated spiral finned-tube bundles, are researched. The experimental results show that the total heat transfer rate of the serrated spiral finned-tube bundles increases as the inlet flue gas temperature, flue gas flow rate, and cooling water flow increase. When the flue gas temperature increases from 250 ℃ to 350 ℃,the total heat transfer rate increases by about 64%. When the flue gas flow rate increases from 8 m/s to 16 m/s, Nusselt number N_u increases by about 40.5%. The increase in the cooling water flow rate improves the total heat exchange rate by about 2.9%. Besides, the experimental results show that the influence of flue gas temperature and cooling water flow on Euler number E_u is less. The novel serrated spiral finned-tube bundles can increase the waste heat utilization rate of high-temperature flue gas, and save natural gas energy, and improve the economic efficiency of combined cycle power plants. The exporimental results provide a reference for practical engineering applications.更多还原