直接接触式蒸汽发生器传热性能分析

Analysis of the Heat Transfer Performance of a Direct Contact Type Steam Generator

本文建立了直接接触式蒸汽发生器的数理模型,模拟分析了直接接触式蒸发器的独立变量,如:初始换热温差、工质流率和导热油流率及它们对容积换热系数、总换热体积、工质蒸汽发生量及工质蒸汽出口温度等蒸发器主要换热性能的影响,同时通过试验手段对所建立的数理模型进行了验证,结果表明:蒸汽发生器性能理论曲线与试验值一致性较好,且各独立变量与换热性能间存在复杂的非线性函数关系,为了获得最佳换热性能,有必要对换热系统进行多参数并进行优化。

Established was a mathematical model for direct contact type steam generators,simulated and analyzed was the influence of such independent variables of a direct contact type steam generator as the initial heat exchange temperature difference and the working medium flow rate and heat conduction oil flow rate on the main performance of a steam generator such as its volumetric heat exchange coefficient,total heat exchange volume,working medium steam production capacity and the temperature of the working medium at the outlet and at the same time verified was the mathematical model thus established through employing the test means. It has been found that the values obtained from the theoretical curves of the performance of the steam generator has a relatively good agreement with the test values and a complicated non-linear function relationship does exist between various independent variables and the heat exchange performance. In order to obtain the optimum heat exchange performance,it is necessary to perform a parallel optimization of the heat exchange system.