Abstract:

Submerged combustion evaporation technology is a heat exchange technology that uses high-temperature flue gas as the heat source to evaporate the liquid in direct contact with it. However, existing research lacks thermal state simulations of the immersed combustion evaporation process and investigations on the impact of the inclination angle of the distribution disc inside the evaporator on the evaporation. In this study, we conducted a thermal state numerical simulation on the structural parameters of the distributed disc-type submerged combustion evaporator using the Euler method. Herein, the flue gas distribution inside the evaporator was obtained by studying the gas-liquid two-phase flow. Additionally, the impact of different distribution disc inclination angles on the evaporation amount and pressure fluctuation was explored. The numerical simulation results indicate that the angle of the distribution disc affects the distribution of flue gas in the liquid. Moreover, the pressure fluctuation at the inlet of the submerged tube can be reduced by increasing the distribution disc’s angle, thereby increasing backpressure stability in the burner. Conversely, the heat exchange effect between gas and liquid can be enhanced by decreasing the distribution disc’s angle, thereby enhancing evaporation efficiency.

Key words: submerged combustion, distribution disk, flue gas, evaporation, concentration, two-phase flow, numerical simulation