干燥曲線及干燥速率曲線測定實驗數(shù)據(jù)處理

序號累計時間(分)總重量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)]10108.62.0572.01593.123323107.31.9751.93632.883036106.11.8981.86312.6428491051.8281.79622.40255121041.7641.73252.40256151031.7011.67202.1623718102.11.6431.61462.1623821101.21.5861.55732.1623924100.31.5291.50002.1623102799.41.4711.44272.1623113098.51.4141.38542.1623123397.61.3571.32802.1623133696.71.2991.27072.1623143995.81.2421.21342.1623154294.91.1851.15612.16231645941.1271.09872.1623174893.11.0701.04142.1623185192.21.0130.98412.1623195491.30.9550.92682.1623205790.40.8980.86942.1623216089.50.8410.81212.1623226388.60.7830.75801.9220236687.80.7320.70701.92202469870.6820.65921.6818257286.30.6370.61461.6818267585.60.5920.56691.9220277884.80.5410.51591.92202881840.4900.46821.6818298483.30.4460.42361.6818308782.60.4010.38221.44153190820.3630.34711.2013329381.50.3310.31850.9610339681.10.3060.28981.2013349980.60.2740.25801.20133510280.10.2420.22930.96103610579.70.2170.20061.20133710879.20.1850.16881.20133811178.70.1530.14010.96103911478.30.1270.11460.96104011777.90.1020.08920.9610

4112077.50.0760.06690.72084212377.20.0570.04780.72084312676.90.0380.03180.48054412976.70.0250.01910.48054513276.50.0130.00640.48054613576.3干燥實驗數(shù)據(jù)整理表 設備編號：1#空氣孔板流量計讀數(shù)R(KPa)0.5干球溫度t(C)60流量計處空氣溫度to(°C)48.8濕球溫度tw(C)40to(C)空氣密度P(Kg/m3)1.11twC下水的氣化熱(kJ/kg)Ytw2600流量計孔流系數(shù)CO0.65洞道截面積(m2)=0.13*0.170.0221孔板孔徑dO(m)0.04干燥面積(m2)S=0.141*0.082*2=0.023124框架重量GD(g)60.6絕干物料量GC：(g)15.7對流傳熱系數(shù)a(w/m2C)=40.60干燥器內(nèi)空氣實際體積流量Vt(m3/s)=0.0254干燥器內(nèi)空氣流速u(m/s)=1.1477干燥速率曲線11-驗￥3*■■b3*■■b?■R1f-nki卜*4k4n廠F■h1krF~■1r4.,.■n-<1■■■?：0.20.33.斗 ￡0.70.0.9DL.11.21. 1.51.-5 7 1Xar(E[g/Kd干躱曲線X-T2：O11.s1.B1.71.￡1.5L.4g:弓命11岀L.<J同 atD.Ba.-a■&asQ.4as0.2D.L%4J￥faJ1..■■f■■*1"T■電■*.p*￡10PQ SO 4ClSa ￡0 7<l B￡l 30^1 310130 130140150Tte)

計算實例：空氣物理性質(zhì)的確定：流量計處空氣溫度to=48.8(°C),查表得空氣密度P=l.ll(Kg/m3)濕球溫度tw=40(°C),tw°C下水的氣化熱(kJ/kg)Ytw=2600。以第一組數(shù)據(jù)為例1、 計算干基含水量X=(總重量GT-框架重量GD-絕干物料量GC)/絕干物料量GC=(l08.6-60.6-l5.7)/l5.7=2.057(kg/kg)2、 計算平均含水量XAV=兩次記錄之間的平均含水量=(2.057+1.975)/2=2.0159(kg水/kg絕干物料)3、 計算干燥速率U=-(絕干物料量GC/干燥面積S)*(△X/^T)=-(15.7*0.001/0.023124))*(1.975-2.057)/(3*60)=0.0003123[kg/(s?m2)]4、 繪制干燥曲線(X—T曲線)和干燥速率曲線(U—XAV曲線)Uc*r*10005、計算恒速干燥階段物料與空氣之間對流傳熱系數(shù)a[W/m2C] a二twt—twUc—恒速干燥階段的干燥速率，kg/(m2?s)=0.0002162Ytw—twC下水的氣化熱，kJ/kg。查表P351,tc-t=374-40=334°C.查表得,Ytw=2600a=2.162*0.0001*2600*1000/(60-40)=28.116、計算干燥器內(nèi)空氣實際體積流量Vt(m3/s)。=6、計算干燥器內(nèi)空氣實際體積流量Vt(m3/s)。=Vxt0273+1273+10=0.0245*273+60273+48.8=0.254其中：=0.254■2xAP .?*500Vt0—t0C時空氣的流量，m3/s；%=C0xA0'丁=0?65*0.001256Vt0—t0C時空氣的流量，m3/s；=0.0245t0—流量計處空氣的溫度，t0=48.8°C；t—干燥器內(nèi)空氣的溫度，t=60°C；C0—流量計流量系數(shù)，C0=0.6；兀 314A二一d2 *0.042二0.001256A0—流量計孔節(jié)孔面積，m2。 0 40 4d0—孔板孔徑，d0=0.