新型余热锅炉冷却水流动及传热特性模拟和优化  

Simulation and Optimization of Flow and Heat Transfer Characteristic of Cooling Water for a New Type of Waste Heat Boiler

作　　者：王风录 虞斌[1] 吕林 田一皓 WANG Feng-lu;YU Bin;LÜLin;Tian Yi-hao(College of Mechanical and Power Engineer,Nanjing Tech University,Nanjing211816,China)

机构地区：[1]南京工业大学机械与动力工程学院,江苏南京211816

出　　处：《石油化工设备》2023年第5期16-22,共7页Petro-Chemical Equipment

摘　　要：对设置导流结构后的新型急冷余热锅炉冷却水的流场进行模拟,发现随着中间导流板位置的变化,冷却水的高温区域逐渐离开烟气入口侧的管板向流场的中部移动,并由最上排换热管周边区域逐渐扩展至管束中间区域甚至下排换热管区域。对不同情况下冷却水流场中的局部最大传热系数、平均传热系数、标准差和出口截面含气率进行了分析。相较于无导流结构的冷却水流场,具有导流结构的冷却水流场的局部最大传热系数降低6.06%,平均传热系数提高1.98%,标准差由0.94降至0.54,提升总传热系数的同时使流场内热流分布更均匀,达到强化传热的效果。The flow field of cooling water with a draft structure in a new type of quenching waste heat boiler was simulated.With the changed position of mid-baffle of the draft structure,the high-temperature area of cooling water gradually moves away from the tube sheet at the flue gas inlet-side to the middle of the flow field,and the area is expanded from the surrounding area of the top rows of heat exchange tubes to the middle area of the tube bundle or even the lower rows of tubes.The local maximum heat transfer coefficient,average heat transfer coefficient,standard deviation,and outlet void fraction in the cooling water flow field were analyzed.Compared with the cooling water flow field without draft structure,the local maximum heat transfer coefficient of the cooling water flow filed with the draft structure is reduced by 6.06%,the average heat transfer coefficient is increased by 1.98%,and the standard deviation decreased from 0.94 to 0.54.The overall heat transfer coefficient is increased and the heat flow distribution in the flow field is more uniform.

关 键 词：余热锅炉 数值模拟 导流结构 强化传热 

分 类 号：TQ051.5[化学工程]