高炉鼓风除湿热质交换性能理论与实验研究

Theoretical and Experimental Study of Heat and Mass Transfer in Blast-Blast Dehumidification System

基于Whitman理论以及热质平衡理论建立高炉鼓风除湿器理论模型,设计并搭建1∶200高炉鼓风除湿模化实验台,对高温高湿环境下鼓风除湿性能进行实测。结果表明:除湿量理论值与实验值偏差在0.67%～8.53%内,数据差异小,说明理论模型适应性好,可将此理论模型用于大高炉鼓风除湿器设计计算;在高温高湿环境下,鼓风空气入口干球温度为43.5℃、含湿量为58.54 g/m^3时,溶液喷淋浓度为40%,喷淋温度为21.2℃,气液质量流量比为0.7时,除湿效果最优,除湿后鼓风空气含湿量降低44.79 g/m^3,鼓风湿度低至13.75 g/m^3,高炉鼓风风温可提升268.74℃。

Based on Whitman’theory and heat and mass balance theory,a theoretical model of large blast desiccant dehumidifier is established,and a 1∶200 blast dehumidification model test bench is designed and built,and the dehumidification performance is measured.The results show that the deviation between the theoretical dehumidification quantity and the experimental dehumidification quantity is within the range of 0.67%and 8.53%,and the difference in data is small,which indicates that the theoretical model has good adaptability and can be applied to the design and calculation of the dehumidifier for the large blast furnace.The experimental results also show that under high temperature and high humidity conditions,when the dry sphere temperature of air inlet is 43.5℃,the moisture content is 58.54 g/m^3,the solution spray concentration is 40%,the spray temperature is 21.2℃,and the gas-liquid mass flow ratio is 0.7,the dehumidification performance is the best.After dehumidification,the moisture content of blast air is decreased by 44.79 g/m^3,the humidity of blast air is decreased to 13.75 g/m^3,and the blast temperature of blast furnace can be increased by 268.74℃.