天然气高位发热量和低位发热量计算说明

天然气高位发热量和低位发热量计算说明气体j高位发热量HSjkJ/mol摩尔分数Xj摩尔分数X发热量HSjXX.kJ/mol体积发热量HSMJ/m3体积分数V.J压缩因子CJ体积分数/压缩因子V./C.CH4891.090.9512847.5837.5095.1490.998195.330127C2H61561.410.021934.162.1750.9922.1925403C3H82220.130.005011.130.4940.98340.5023388NC4H102878.570.00102.790.0940.96820.0970874IC4H102869.380.00082.360.080.9710.0823893NC5H103537.170.00020.860.0230.9450.0243386IC5H103530.240.00031.030.0280.9530.0293809C6+4196.580.00052.230.0490.9190.0533188N200.01240.001.2460.99971.2463739CO200.00660.000.6620.99440.6657281Z1902.14100100.22362气体j低位发热量HIjkJ/mol摩尔分数Xj摩尔分数X发热量HI-xX.kJ/mol体积发热量HIMJ/m3体积分数V.J压缩因子CJ体积分数/压缩因子V./C.CH4802.650.9511763.4433.8295.1490.998195.330127C2H61428.740.021931.272.1750.9922.1925403C3H82043.230.005010.250.4940.98340.5023388NC4H102657.450.00102.580.0940.96820.0970874IC4H102648.260.00082.180.080.9710.0823893NC5H103271.830.00020.800.0230.9450.0243386IC5H103264.890.00030.960.0280.9530.0293809C6+3887.010.00052.080.0490.9190.0533188N200.01240.001.2460.99971.2463739CO200.00660.000.6620.99440.6657281Z1813.57100100.223621、 计算混合物中第j种组分的“体积分数/压缩因子（Vj/C.Y,“压缩因子”的物理意义为实际气体体积分数与理想气体体积分数的差别，“体积分数/压缩因子（*/q）”就相当于把实际气体体积分数折算成理想气体体积分数。2、 计算混合物中第j种组分的“摩尔分数Xj”。

Xv3、j克0Vj=13、计算1mol混合物中第j种组分的高位发热量。HS.xX.4、计算1mol4、Z(HSXX)j=15、6、计算在P压力、T5、6、H=顽451方、》HXX) MJ/m3j=1式中：8.31451为天然气混合物的气体常数R。计算在P压力、T温度下的低位体积发热量，与高位体积发热量相似，从步骤1到步骤5，只不过把步骤3、4、5中的高位发热量换成低位发热量。性能计算中用到的是天然气的低位发热量，燃烧室的能量平衡关系公式为：GM?]]-卜 ,Q】■可定—tGMalr+GM^ei)*h3 (3.9)式中：一燃烧室的空气摩尔流量■k—压气机出口空气焓一燃烧室的燃料摩尔流量Q]—燃料的低位发热量、.一—燃烧室的燃烧效率h.—燃气透平进口燃气焓上式中燃料的低位发热量Ql单位为MJ/kMol，所以g=HIx22.4L/Mol=36.37MJ/m3x22.4L/Mol=814.688MJ/kMol，其中22.4L/Mol为天然气在标准状态下的摩尔体积。