GAS CONDENSATION COOLING AND LIQUID HEATING EFFICIENCY IN A TURBULENT BUBBLING LAYER ON A TRAY

A simplifi ed and a numerical mathematical models of gas cooling and water heating in a thin turbulent bubbling layer on a tray with cross-phase fl ow are presented. The thermal effi ciency of gas cooling is found using the ideal displacement model, and the temperature profi le in the liquid phase is found from the solution of a cell model or a two-dimensional diff erential equation of convective heat exchange with an interfacial heat source. Examples of calculating the effi ciency of water cooling of gas with diff erent humidity on sieve and valve trays are given. The results of calculations of the thermal effi ciency of gas cooling depending on the height of the gas–liquid layer, as well as on the gas velocity in the column are compared with known experimental data. Conclusions are drawn about the adequacy of the mathematical model and of the developed algorithm for calculating the heat and mass transfer characteristics of the bubbling layer. Comparative characteristics of the thermal effi ciency of sieve and valve trays are given depending on the gas velocity and diff erent heights of the liquid column. The infl uence of the variable mass of valves along the length of the tray on the increase in thermal effi ciency is shown. Conclusions are drawn on the most effi cient designs and modes of operation of bubbling trays.
A simplifi ed and a numerical mathematical models of gas cooling and water heating in a thin turbulent bubbling layer on a tray with cross-phase fl ow are presented. The thermal effi ciency of gas cooling is found using the ideal displacement model, and the temperature profi le in the liquid phase is found from the solution of a cell model or a two-dimensional diff erential equation of convective heat exchange with an interfacial heat source. Examples of calculating the effi ciency of water cooling of gas with diff erent humidity on sieve and valve trays are given. The results of calculations of the thermal effi ciency of gas cooling depending on the height of the gas–liquid layer, as well as on the gas velocity in the column are compared with known experimental data. Conclusions are drawn about the adequacy of the mathematical model and of the developed algorithm for calculating the heat and mass transfer characteristics of the bubbling layer. Comparative characteristics of the thermal effi ciency of sieve and valve trays are given depending on the gas velocity and diff erent heights of the liquid column. The infl uence of the variable mass of valves along the length of the tray on the increase in thermal effi ciency is shown. Conclusions are drawn on the most effi cient designs and modes of operation of bubbling trays.
Author:  A. G. Laptev, E. A. Lapteva
Keywords:  heat and mass transfer, gas cooling, bubbling, mathematical model
Page:  1320