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化工学报  2015 

二氧化碳在CH4+CO2+N2/C2H6三元系中的结霜温度计算

DOI: 10.11949/j.issn.0438-1157.20151069, PP. 30-39

Keywords: 二氧化碳,天然气,结霜,分压定律,状态方程

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Abstract:

含CO2的天然气体系在历经低温工艺时,由于CO2的三相点温度(216.55K)较高,容易凝华结霜产生固体CO2,因而有必要对CO2在天然气中的结霜温度进行计算。根据气固相平衡原理,分别采用道尔顿分压定律、PR状态方程对CO2在CH4-CO2-N2和CH4-CO2-C2H6三元系中的结霜温度进行了计算。此外,还采用HYSYS软件对CO2的结霜温度做了相应的计算。将3种方法的计算结果和实验结果进行了比较,结果表明3种方法在预测三元系中CO2的结霜温度时,都具有良好的精度。其中,PR状态方程法和HYSYS法的精度略高于道尔顿分压定律法;道尔顿分压定律法虽精度最低,但计算最简单,且也能获得满意的精度,可做工程快速估算使用。

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