Countercurrent exchange

About: Countercurrent exchange is a research topic. Over the lifetime, 2255 publications have been published within this topic receiving 28687 citations. The topic is also known as: Countercurrent exchange.

Simulation of Countercurrent Multi-Effect Drying System

Abstract: The paper bulids a countercurrent multi-effect drying process model which can be expressed as a linear programming(LP) problem with the minimum total energy consumption as target function. Based on the model it can be conventient to solve the heat load , degree of drying and other drying parameters of each effect. And it realizes the mathematical simulation an analysis of multi-effect drying process. Such process not only reuses the secondary steam but also utilizes the high energy grade. Drying silica sand using 1-effect drying to 5-effect drying is presented as an example. The energy consumption and energy saving rate are compared by using co-current multi-effect drying and countercurrent multi-effect drying. As a summary, the countercurrent multi-effect drying is better than co-current drying. Considered the equipment investment and energy conservation, the study also concluded that the countercurrent 4-effect drying is the optimum selection, and it can save 57.6% energy compared to countercurrent 1-effect drying.

Steady-state mode of operation of the countercurrent reactor. Liquid-liquid heterogeneous system

Abstract: A two-temperature model of the countercurrent plug-flow reactor for two chemically interacting liquids, the dispersion (continuous) media and dispersed phase, is developed. It is shown that there is a critical velocity of the dispersion medium that delimits two types of steady-state modes. If the velocity is greater than the critical, steady-state regimes with heating the dispersed phase near its inlet are realized. In this mode, the substance dissolved in it burns out completely. If the velocity is less than the critical value, then regimes in which the maximum heating is localized near the inlet of the dispersion medium take place, with full consumption of the reactant. It is shown that the degree of localization is higher, the greater the reaction rate. A criterion for the parameters is obtained that determines the possibility of a thermal explosion during the startup of the reactor.