浆板机气垫式热风箱气体流动及传热特性模拟研究

Research on Air Flow and Heat Transfer Characteristics of Hot Air Box in Air Cushion Drying System

关键词:  浆板机  气垫式热风箱  传热特性  静压

Key Words:air cushion pulp-sheet drier  hot air box  heat-transfer characteristics  static pressure

摘要:探讨了浆板机气垫式热风箱的入口风速、气体温度、出风板开孔率、喷口形状及布置方式对气垫式热风箱气体流动和传热性能的影响。研究表明，热风箱内静压值沿流动方向呈线性增加，随出风板开孔率增大而减小；喷口为圆形叉排时表面传热系数最高，为7.74 W/(m²·K)，三角孔直排时表面传热系数最低，为5.78 W/(m²·K)；热风箱最佳参数为入口空气温度75℃、风速12 m/s、圆孔叉排、开孔率为7.42%。

Abstract:This paper investigated some parameters affecting static pressure distribution and heat transfer coefficient of hot air box in air cushion drying system for pulp sheet production such as the shape and configuration of the holes, inlet velocity, gas temperature and percentage of opening. The results showed that the static pressure increases linearly with the flow direction but decrease with the percentage of opening. The round holes creat the highest surface heat transfer coefficient and the triangular holes creat the lowest. The optimal parameters of hot air box are the followings: inlet air temperature 75℃, inlet velocity 12 m/s, mixed arrangement of circular and triangle holes and the percentage of opening 7.42%.