Abstract—

A mathematical model describing the desorption of dissolved oxygen from superheated water when it enters the rarefaction zone is proposed. The initial model was obtained proceeding from a thermodynamic approach as a result of solving the material balance equations for the components of the considered “water–water vapor–gas” system taking into account the phase transition in the liquid. Further development of the model for taking into account the nonequilibrium nature of the processes occurring in the system was carried out using the methods of the heat and mass transfer processes similarity theory and regression analysis involving experimental data on various types of deaeration devices. Based on the results from a statistical analysis of alternative models, including the well-known model describing the deaeration of water when it enters into vacuum jet-bubbling deaerators, the choice of the final mathematical model is substantiated. Using this makes it possible to calculate the deaeration effect under the considered conditions depending on the initial water superheating with respect to the saturation temperature in the rarefaction zone, the deaeration element hydraulic load, and static pressure in it. It has been found that the obtained mathematical description is able to generalize, with acceptable accuracy, the experimental information on structurally different deaeration elements operating when superheated water is injected into them: droplet, centrifugal-vortex, cavitation-jet, and vacuum-cavitation ones. The obtained model can be used in designing new and improving the performance efficiency of existing deaeration plants at thermal power plants and industrial enterprises. As part of the study, the model was tested in solving problems concerned with operational adjustment of a cavitation-jet deaerator and for substantiating the technical solutions on upgrading the jet deaerator by topping it with a deaeration device operating under superheated water conditions.

中文翻译：

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模拟过热水进入稀薄区时的溶解氧解吸

摘要-

提出了描述过热水中溶解氧在进入稀薄区时解吸的数学模型。初始模型是从热力学方法中获得的，这是在考虑到液体中的相变的情况下求解所考虑的“水-水蒸气-气体”系统组分的物质平衡方程的结果。使用传热和传质过程相似理论和回归分析的方法进行了模型的进一步开发，以考虑系统中发生的过程的非平衡性质，其中涉及各种类型的脱气装置的实验数据。根据替代模型的统计分析结果，包括描述水进入真空喷射鼓泡除氧器时除氧的众所周知的模型，最终数学模型的选择得到证实。使用它可以根据初始水过热相对于稀疏区的饱和温度、除气元件的水力负载和其中的静压计算在所考虑条件下的除气效果。已经发现，获得的数学描述能够以可接受的精度概括当过热水注入其中时运行的结构不同的脱气元件的实验信息：液滴、离心涡流、空化喷射和真空空化。 . 获得的模型可用于设计新的和提高热电厂和工业企业现有脱氧设备的性能效率。作为研究的一部分，该模型在解决与空化射流除氧器的操作调整有关的问题以及通过在过热水条件下运行的除氧装置顶部来证实对射流除氧器进行升级的技术解决方案方面进行了测试。