干燥曲线和干燥速率曲线的测定.doc

五、实验数据的记录与处理1、实验数据的记录空气孔板流量计压差1.10KPa 流量计处得空气温度t0=47.2 干球温度t=60湿球温度tw=34.5 框架质量GD=79.2g 绝干物料Gc=23.3g干燥面积A=0.011m2 洞道截面积0.143m21、原始实验数据的记录时间/min物料重量/g空气流量/Kpa空气温度/湿球温度/干球温度/0144.8 1.10 40.4 34.1 60.0 3144.1 1.08 42.8 34.5 59.9 6143.3 1.08 45.5 34.7 60.0 9142.2 1.08 46.4 34.4 60.3 12141.2 1.08 46.7 34.7 59.0 15140.2 1.08 46.6 34.5 60.5 18139.2 1.08 47.0 34.5 59.6 21138.1 1.08 46.9 34.7 60.2 24137.1 1.08 47.1 34.5 60.1 27136.1 1.08 47.0 34.7 60.0 30135.0 1.08 47.0 34.4 60.3 33134.0 1.08 47.1 34.7 59.4 36132.9 1.08 46.9 34.5 60.6 39132.2 1.08 47.2 34.3 59.5 42130.7 1.08 47.0 34.5 60.7 45129.8 1.08 47.1 34.3 60.1 48128.7 1.08 46.8 34.5 59.7 51127.7 1.08 47.0 34.3 60.5 54126.6 1.08 47.0 34.6 59.4 57125.6 1.08 46.9 34.5 60.4 60124.6 1.08 47.0 34.5 59.6 63123.6 1.08 47.0 34.4 60.1 66122.5 1.08 47.0 34.3 60.2 69121.5 1.08 47.0 34.5 59.7 72120.6 1.08 47.1 34.2 59.5 75119.6 1.08 46.9 34.6 60.3 78118.6 1.08 47.0 34.3 59.7 81117.6 1.08 47.0 34.5 60.1 84116.6 1.08 47.0 34.3 59.9 87115.7 1.08 47.0 34.3 59.7 90114.8 1.08 47.0 34.3 60.1 93113.8 1.08 47.0 34.3 59.5 96113.0 1.08 47.0 34.3 60.5 99112.2 1.08 47.0 34.3 59.8 102111.4 1.08 47.0 34.6 60.0 105110.7 1.08 47.0 34.5 60.3 2、实验数据的处理由于干燥速率U被干燥的物料重量G物料的干基含水率X恒速阶段的对流传热系数 同时由节流式流量计的流量公式和理想气体的状态方程式可推导出：所以依据以上公式对数据处理后得时间/min干燥速率干基含水量XVtoVtU传热系数00.41270.0011 0.0012 31.3101 0.40590.0011 0.0012 8.273E-057.8762 61.4973 0.39800.0011 0.0012 9.454E-059.0370 92.0588 0.38730.0011 0.0012 1.300E-0412.1380 121.8716 0.37760.0011 0.0012 1.182E-0411.7611 151.8716 0.36780.0011 0.0012 1.182E-0410.9921 181.8716 0.35800.0011 0.0012 1.182E-0411.3863 212.0588 0.34730.0011 0.0012 1.300E-0412.3284 241.8716 0.33760.0011 0.0012 1.182E-0411.1639 271.8716 0.32780.0011 0.0012 1.182E-0411.2962 302.0588 0.31710.0011 0.0012 1.300E-0412.1380 331.8716 0.30730.0011 0.0012 1.182E-0411.5706 362.0588 0.29660.0011 0.0012 1.300E-0412.0450 391.3101 0.28980.0011 0.0012 8.273E-057.9387 422.8074 0.27510.0011 0.0012 1.773E-0416.3623 451.6844 0.26630.0011 0.0012 1.064E-049.9696 482.0588 0.25560.0011 0.0012 1.300E-0412.4752 511.8716 0.24590.0011 0.0012 1.182E-0410.9082 542.0588 0.23510.0011 0.0012 1.300E-0412.6764 571.8716 0.22540.0011 0.0012 1.182E-0411.0346 601.8716 0.21560.0011 0.0012 1.182E-0411.3863 631.8716 0.20590.0011 0.0012 1.182E-0411.1204 662.0588 0.19510.0011 0.0012 1.300E-0412.1380 691.8716 0.18540.0011 0.0012 1.182E-0411.3411 721.6844 0.17660.0011 0.0012 1.064E-0410.1666 751.8716 0.16680.0011 0.0012 1.182E-0411.1204 781.8716 0.15710.0011 0.0012 1.182E-0411.2518 811.8716 0.14730.0011 0.0012 1.182E-0411.1639 841.8716 0.13760.0011 0.0012 1.182E-0411.1639 871.6844 0.12880.0011 0.0012 1.064E-0410.1266 901.6844 0.12000.0011 0.0012 1.064E-049.9696 931.8716 0.11020.0011 0.0012 1.182E-0411.3411 961.4973 0.10240.0011 0.0012 9.454E-058.7266 991.4973 0.09460.0011 0.0012 9.454E-058.9661 1021.4973 0.08680.0011 0.0012 9.454E-059.0014 1051.3101 0.08000.0011 0.0012 8.273E-057.7541 依据以上数据标绘出的干燥曲线如下图所示干燥速率曲线如下图所示故恒定干燥速率Uc为所以Uc=0.115kg/(m2*s)临界含水率通过观察干燥速率图可以看出X*=0.3580kg水/kg绝干物料1.中压风机；2.孔板