干燥-小结的.ppt

* * 第五章 小结 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 固体干燥 湿空气性质及I-H图 物料衡算与热量衡算 平衡关系与干燥速率 干燥器 性质（H,φ, CH, IH, vH, t, td, tas, tw) I-H图（等H线，等I线，等φ线，等 t 线，蒸汽分压线） 湿物料含水量（w，X） 物料衡算 热量衡算 平衡湿含量X* 结合水与非结合水 干燥速率（干燥曲线，干燥速率曲线，临界含水量） 干燥时间（恒速段，降速段） 平衡水分与自由水分 知识结构图 热效率 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 湿度 饱和湿度 相对湿度 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 比热容 焓 比容 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. td：不饱和空气等湿冷却至饱和 td t φ= 100% Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. φ= 100% t tas 或 tw A tas 空气的绝热降温增湿等焓过程 对空气-水蒸气体系 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. (1) 湿空气在预热过程中不变化的参数是 A焓；B相对湿度；C露点温度；D湿球温度。 (2) 空气温度为t0，湿度为H0，相对湿度为φ0的湿空气，经一间接蒸汽加热的预热器后，空气的温度为t1，湿度为H1，相对湿度为φ1，则 A H1H0 B φ0 φ1 C H1 H0 D φ0 φ1 (3)在1atm下，不饱和湿空气的温度为295K，相对湿度为60％，当加热到373K时，该空气下列状态参数将如何变化？ 绝对湿度 不变 ，相对湿度 减小，湿球温度 升高， 露点 不变，焓 增加 。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 干基湿含量 湿基湿含量 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. W=L(H2-H1)=Gc(X1-X2) 物料衡算 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. （近似计算式） QD=L(I2-I1)+Gc(I2-I1)+QL Q=Qp + QD 热量衡算 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 当干燥器无补充热量，且干燥器中空气所放出的热量全部用来汽化湿物料中的水分时 热效率 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. (1