干燥曲线及干燥速率曲线测定试验数据处理

1、序号累计时间(分)总重量GT (g)干基含水量X(kg/kg)平均含水量XAV (kg/kg)干燥速率UX104 kg/(s m2)10108.62.0572.01593.123323107.31.9751.93632.883036106.11.8981.86312.6428491051.8281.79622.40255121041.7641.73252.40256151031.7011.67202.1623718102.11.6431.61462.1623821101.21.5861.55732.1623924100.31.5291.50002.1623102799.41.4711.4427

2、2.1623113098.51.4141.38542.1623123397.61.3571.32802.1623133696.71.2991.27072.1623143995.81.2421.21342.1623154294.91.1851.15612.16231645941.1271.09872.1623174893.11.0701.04142.1623185192.21.0130.98412.1623195491.30.9550.92682.1623205790.40.8980.86942.1623216089.50.8410.81212.1623226388.60.7830.75801.

3、9220236687.80.7320.70701.92202469870.6820.65921.6818257286.30.6370.61461.6818267585.60.5920.56691.9220277884.80.5410.51591.92202881840.4900.46821.6818298483.30.4460.42361.6818308782.60.4010.38221.44153190820.3630.34711.2013329381.50.3310.31850.9610339681.10.3060.28981.2013349980.60.2740.25801.201335

4、10280.10.2420.22930.96103610579.70.2170.20061.20133710879.20.1850.16881.20133811178.70.1530.14010.96103911478.30.1270.11460.96104011777.90.1020.08920.96104112077.50.0760.06690.72084212377.20.0570.04780.72084312676.90.0380.03180.48054412976.70.0250.01910.48054513276.50.0130.00640.48054613576.3干燥实验数据整

5、理表设备编号：1#空气孔板流量计读数 R(KPa)0.5 干球温度t(C )60流量计处空气温度to( C)48.8 湿球温度tw(C)40to( C )空气密度p(Kg/m3)1.11twC下水的气化热(kJ/ kg) t tw2600流量计孔流系数C00.65洞道截面积(m2)=0.13*0.170.0221孔板孔径d0( m)0.04干燥面积(m2)S=0.141*0.082*2=0.023124框架重量GD (g)60.6绝干物料量GC: (g)15.7对流传热系数a (w/m2 °C )=40.60干燥器内空气实际体积流量Vt(m3/ s)=0.0254干燥器内空气流速 u

6、(m/s)=1.1477干燥速率曲线UT明0.00.1 0.2 0.3 0.4 Q. 5 0. TO. B 0.9 1. 0 L 11. 2 1. 3 1.4：. 51.41. 7：. Bl. 9 2.0 2.1干煤曲线X T计算实例：空气物理性质的确定：流量计处空气温度to=48.8(C )，查表得空气密度 p =1.11(Kg/m3)湿球温度tw=40(C ), twC下水的 气化热(kJ/ kg) 丁 tw=2600。以第一组数据为例1、 计算干基含水量 X=(总重量GT-框架重量GD-绝干物料量GC) /绝干物料量GC=(108.6-60.6-15.7)/15.7=2.057 (kg/

7、kg)2、 计算平均含水量XAV=两次记录之间的平均含水量 =(2.057+1.975)/2=2.0159 (kg水/kg绝干物料)3、 计算干燥速率 U=-(绝干物料量 GC/干燥面积S) * ( X/ T)=-(15.7*0.001/0.023124)*(1.975-2.057)/(3*60) =0.0003123 kg/ (s m2)4、绘制干燥曲线(X T曲线)和干燥速率曲线(U XAV曲线)5、计算恒速干燥阶段物料与空气之间对流传热系数也W/m 2 C 5= UC "w *1000t -'twUc一恒速干燥阶段的干燥速率，kg/ (m2?s) =0.0002162丫

8、 tw tw C下水的气化热，kJ/ kg。查表 P351,tc-t=374-40=334 C .查表得，丫 tw=2600a =2.162*0.0001*2600*1000/(60-40)=28.116、计算干燥器内空气实际体积流量其中：Vt(m3/ s)273 - t27360Vt =Vt = 0.0245 * 0273 - t027348.8=0.2541 2 * 500*.1 .112 <=PVt° =C0 A00.65 * 0.001256Vt0 t0C时空气的流量,m3/ s;' =0.0245t0一流量计处空气的温度，t0=48.8 C； t一干燥器内空气的温度，t =60 C；C0一流量计流量系数，C0=0.6;二 23.142A0 = d 0 =* 0.04= 0.001256A0一流量计孔节孔面积，m2。44d0一孔板孔径，d0=0.04 m。 P一流量计压差，