摘要
在对流干燥设计中,首先要了解干燥系统使用地的海拔高度和气象资料;对物料干燥参数要尽可能多的掌握;在热量衡算中建议采用"微团法"来计算,简单方便;在干燥热风干空气质量流量计算后,一定要对排风的湿含量进行验算,以防结露;干燥热量的留有余量和热源的留有余量要分开计算,不要重复计算;在干燥器内,干燥热风的特征速度是关键,不同的干燥器有不同的特征速度范围;要合理估算干燥系统内各部件和管道的阻力;要根据通过鼓风机和引风机的不同空气温度下湿空气体积流量来选用风机,要使风机的静压足以克服干燥系统的阻力。
In the design of convective drying, the elevation and meteorological material of the place using drying system are found out in the first. The parameters of drying materials are known well as far as possible. It is suggested that the "Corpuscle Metsod" is adopted in heating calculation, simply and conveniently. After calculating the mass flow of hot-blast for drying, the moisture of exhaust is checked certainly, for avoiding dewdrop. The remainders of drying heat and hot source are calculated separately, not are duplicated. In the drying system, the speed of heat wind for drying is key, the different drying equipments have the different speed range. The resistances in different parts and pipes of drying system are estimated rationally. According to the different air temperature and volume flow, air-blower and air exhauster are selected, their static pressure overcome the resistance of drying system.
关键词
环境参数
干燥参数
热量衡算
质量流量和体积流量
热风流速
系统阻力
风机选用
Environmental parameter
Drying parameter, Heat calculating
Mass flow and volume flow
Speed of heat wind
System resistance
Selecting blower and exhauster