供热蒸汽焓值计算方法:表1.过热蒸汽特性参数YXZ压力P(表压MPa)温度t(℃)焓i(kJ/kg)1.2(Ymin)280(Xmin)3003.01Z(Y1,X1)2903025.06Z(Y1,X2)3003046.93Z(Y1,X3)3103068.66Z(Y1,X4)3203090.27Z(Y1,X5)3253101.05Z(Y1,X6)3303111.8Z(Y1,X7)3353122.53Z(Y1,X8)3403133.25Z(Y1,X9)350(Xmax)3154.64Z(Y1,X10)1.5280(Xmin)2993.75Z(Y2,X1)2903016.46Z(Y2,X2)3003038.93Z(Y2,X3)3103061.18Z(Y2,X4)3203083.25Z(Y2,X5)3253094.23Z(Y2,X6)3303105.18Z(Y2,X7)3353116.1Z(Y2,X8)3403127Z(Y2,X9)350(Xmax)3148.72Z(Y2,X10)1.7280(Xmin)2987.38Z(Y3,X1)2903010.57Z(Y3,X2)3003033.45Z(Y3,X3)3103056.07Z(Y3,X4)3203078.47Z(Y3,X5)3253089.6Z(Y3,X6)3303100.69Z(Y3,X7)3353111.75Z(Y3,X8)3403122.77Z(Y3,X9)350(Xmax)3144.72Z(Y3,X10)1.8280(Xmin)2984.14Z(Y4,X1)2903007.58Z(Y4,X2)3003030.68Z(Y4,X3)3103053.49Z(Y4,X4)3203076.06Z(Y4,X5)3253087.26Z(Y4,X6)3303098.43Z(Y4,X7)3353109.55Z(Y4,X8)3403120.63Z(Y4,X9)350(Xmax)3142.71Z(Y4,X10)1.9280(Xmin)2980.85Z(Y5,X1)2903004.55Z(Y5,X2)3003027.87Z(Y5,X3)3103050.88Z(Y5,X4)3203073.62Z(Y5,X5)3253084.91Z(Y5,X6)3303096.14Z(Y5,X7)3353107.33Z(Y5,X8)3403118.48Z(Y5,X9)350(Xmax)3140.68Z(Y5,X10)2280(Xmin)2977.53Z(Y6,X1)2903001.49Z(Y6,X2)3003025.04Z(Y6,X3)3103048.25Z(Y6,X4)3203071.16Z(Y6,X5)3253082.53Z(Y6,X6)3303093.84Z(Y6,X7)3353105.1Z(Y6,X8)3403116.32Z(Y6,X9)350(Xmax)3138.64Z(Y6,X10)2.1280(Xmin)2974.17Z(Y7,X1)2902998.39Z(Y7,X2)3003022.18Z(Y7,X3)3103045.59Z(Y7,X4)3203068.69Z(Y7,X5)3253080.13Z(Y7,X6)3303091.52Z(Y7,X7)3353102.86Z(Y7,X8)3403114.14Z(Y7,X9)350(Xmax)3136.58Z(Y7,X10)2.2280(Xmin)2970.76Z(Y8,X1)2902995.26Z(Y8,X2)3003019.29Z(Y8,X3)3103042.91Z(Y8,X4)3203066.19Z(Y8,X5)3253077.72Z(Y8,X6)3303089.19Z(Y8,X7)3353100.59Z(Y8,X8)3403111.95Z(Y8,X9)350(Xmax)3134.52Z(Y8,X10)2.3280(Xmin)2967.32Z(Y9,X1)2902992.1Z(Y9,X2)3003016.37Z(Y9,X3)3103040.2Z(Y9,X4)3203063.67Z(Y9,X5)3253075.29Z(Y9,X6)3303086.83Z(Y9,X7)3353098.32Z(Y9,X8)3403109.74Z(Y9,X9)350(Xmax)3132.44Z(Y9,X10)2.5(Ymax)280(Xmin)2960.3Z(Y10,X1)2902985.66Z(Y10,X2)3003010.44Z(Y10,X3)3103034.71Z(Y10,X4)3203058.57Z(Y10,X5)3253070.36Z(Y10,X6)3303082.07Z(Y10,X7)3353093.71Z(Y10,X8)3403105.28Z(Y10,X9)350(Xmax)3128.25Z(Y10,X10)用温度和压力分别作为X和Y,焓值作为Z变量,可求出表的规定范围内温度与压力任意组合下的焓值。所计算的焓值=121min)()(YYYZYspanYYactZZ式中1YZ=max)min,(min)]min,(min)max,([min)(YXZXspanYXZYXZXXact2YZ=max)min,(max)]max,(max)min,([min)(YXZXspanYXZYXZXXactXact=X的实际值Xmin=(紧靠X实际值)前的X值Xmax=(紧靠X实际值)后的X值XSpan=Xmax-Xmin,紧靠X实际值前后X值的范围。Yact=Y的实际值。Ymin=紧靠Y实际值之前的Y值。Ymax=紧靠Y实际值之后的Y值。YSpan=Ymax-Ymin,紧靠Y实际值前后Y值的范围。举个例子:计算压力为1.3MPa,温度为295℃的焓值。计算如下:1YZ=)5.1,290(290300)]2.1,290()2.1,300([)290295(ZZZ2YZ=)5.1,290(290300)]5.1,300()5.1,290([)290295(ZZZ所计算的焓值H=1212.15.1)2.13.1()(YYYZZZ总热量计算公式为:Qm=dtqHmt***1000*36000其中,H为计算值(kJ/kg)qm为所测质量流量(t/h)Qm为时间积分流量(时间为秒累计)