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【简答题】
某干燥系统如图 1 所示。干燥器的操作压强为 100kPa ,出口气体的温度为 60 °C ,相对湿度 70% ,将部分出口气体送回干燥器入口与新鲜空气相混合,使进入干燥器的气体温度不超过 95 °C ,相对湿度为 12% ,已知新鲜空气的质量流量为 0.60kg/s ,温度为 18 °C ,湿度为 0.006kg 水 /kg 绝干气,试求: ( 1 ) 空气的循环量 L 2 为多少 kg 绝干气 /s? ( 2 ) 新鲜空气经预热后的温度 t 1 , °C ( 3 )预热器需提供的热量 Q , kW ( 4 )若将流程改为先混合后预热,试列式说明所需预热量有无变化。 ( 水的饱和蒸汽压 , 在 60 °C 19.92kPa ,在 95 °C 84.56kPa) 。
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