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天然气物性计算的精度、速度和稳定性对天然气流程数值模拟效果影响很大。基于此,提出了天然气热力性质的隐式拟合模型,并给出了将该模型转化为显式计算的方法。该方法能够保证天然气热力性质计算的可逆性,同时由于不存在迭代,因而保证了热力性质计算的绝对稳定性。以国内某LNG接收站天然气组分为例,以HYSYS计算结果作为数据源,对上述模型进行验证。结果表明:该模型在拟合范围内最大计算偏差小于1%,且计算速度远快于LKP状态方程。该方法因模拟结果精确、计算效率高,在天然气工业领域的流程模拟中,具有较好的推广应用前景。
The accuracy, speed and stability of natural gas physics calculation have a great influence on the numerical simulation of natural gas flow. Based on this, an implicit fitting model of the thermodynamic properties of natural gas is proposed, and a method of converting the model into an explicit calculation is given. The method can ensure the reversibility of the thermodynamic properties of natural gas, and at the same time guarantees the absolute stability of thermodynamic properties calculation because there is no iteration. Taking a natural gas component of a domestic LNG receiving station as an example, the HYSYS calculation result is taken as a data source to verify the above model. The results show that the maximum deviation of this model is less than 1% within the fitting range and the calculation speed is much faster than that of LKP equation of state. Due to the accurate simulation results and high computational efficiency, this method has a good prospect of popularization and application in the process simulation of natural gas industry.