Abstract

An analytical model of a solid–liquid heterogeneous reaction to form a gas phase was presented. The model is based on the analysis of the main parameters that have the most significant effect on the intensity of the reaction. The formation of gas–liquid dissipative structures in the form of alternating flows of reacting phases that perform relaxation pulsations was shown. The formation, detachment, and movement of bubbles were described with a satisfactory adequacy. The dynamics and conditions for the formation of a gas bubble on a solid reaction surface were characterized. Relationships were obtained for estimating the mass-transfer coefficients, which correlate with experimental data. The developed analytical model of the heterogeneous reaction will give a better insight into the essence of the melting processes in ore-thermal furnaces, which will make it possible to make changes to these processes using qualitatively new parameters of their characteristic reactions. Analysis of the hydrodynamics with the formation of the gas phase by analytical and numerical methods suggested the type of the flow of the liquid phase. Typical was the presence of hydrodynamic structures that determined the ordered movement of the liquid phase with various methods of supplying the gas phase. The values of critical mass-transfer parameters were determined. In contrast to the boiling process, a crisis of the heterogeneous reaction is impossible because of the shielding of the reaction surface.

中文翻译：

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固液多相反应形成气相的理论

摘要

提出了形成气相的固液非均相反应的分析模型。该模型基于对反应强度影响最显着的主要参数的分析。显示了以执行弛豫脉动的反应相交替流动的形式形成气液耗散结构。对气泡的形成、脱离和运动进行了令人满意的充分描述。表征了固体反应表面上气泡形成的动力学和条件。获得了用于估计传质系数的关系，该关系与实验数据相关。所开发的非均相反应分析模型将更好地了解矿热炉中熔化过程的本质，这将使得使用其特征反应的定性新参数对这些过程进行改变成为可能。通过分析和数值方法对气相形成的流体动力学进行分析表明了液相的流动类型。典型的是流体动力结构的存在，它决定了液相与各种供应气相的方法的有序运动。确定了临界传质参数的值。与沸腾过程相反，由于反应表面的屏蔽，不可能发生非均相反应的危机。