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本文提出以数学软件Maple为运算工具计算闪蒸过程中汽化率、平衡组成的新方法。该法编程简单,计算过程快捷,容易反复计算,计算的准确性好、精度高。通过解方程直接求得汽化率,无需试差。软件特有的图形绘制功能为计算等焓节流问题提供了较大的便利。列举了汽液平衡常数与组成无关的等温闪蒸计算、汽液平衡常数与组成有关的等温闪蒸计算以及等焓节流的计算3个计算实例。讨论了进料组成对汽化率的影响,并用图形表示了进料组成不同取值时的汽化率。对等焓节流的计算方法进行了比较,利用此方法计算所得节流后温度与其他方法差别不大,但汽化率的差别比较明显。计算结果表明,Maple软件能有效地计算各类闪蒸过程,可成为教师授课与工程技术人员计算的工具,也可提高学生利用计算机解决闪蒸过程中汽化率等问题的能力。
In this paper, we propose a new method to calculate the vaporization rate and equilibrium composition in the flash evaporation process using Maple as a mathematical tool. The method programming is simple, the calculation process is quick, easy to calculate repeatedly, the calculation accuracy is good, the precision is high. Solve the equation directly through the evaporation rate, without trial and error. Software-specific graphics rendering function for the calculation of isentropic throttling problems provide greater convenience. Three calculation examples of isothermal flash calculation, gas-liquid equilibrium constant and composition-related isothermal flash calculation, and isothermal enthalpy calculation are listed. The effect of feed composition on the rate of vaporization is discussed and the rate of vaporization at various values of feed composition is graphically represented. The calculation methods of the equivalent enthalpy and throttling are compared. The calculated temperature after throttling this method is not different from other methods, but the difference of the vaporization rate is obvious. The calculation results show that Maple software can effectively calculate all kinds of flashing process, which can be used as a tool for teacher teaching and engineering technicians calculation, and also can improve students’ ability of using computers to solve the problem of vaporization rate during flashing.