۳D Flow Simulation Inside a Desuperheater

One of the methods used to decrease the superheated vapor temperature is the implementation of desuperheaters which by using cool water injection, maximization of evaporation surface and droplet evaporation lead to a reduction in superheated vapor temperature. In this paper, a desuperheater which utilizes surface injection from its inlet as desuperheater’s injector is simulated by using the discrete phase model (DPM) that is based on eulerian-lagrangian approach. Heat transfer between water droplets and superheated steam is simulated as a biphasic ۳D flow in ANSYS FLUENT by considering standard k-ε turbulence model. The effect of water droplets diameter, pipe diameter and superheated steam’s mass flow rate at the inlet on evaporation rate and outlet steam temperature has been studied. The results suggest that with a reduction in water droplets diameter and an increase in pipe diameter, the contact surface between the two phases increase, thus lowering the length required for complete evaporation.

Keywords:

“Desuperheater , Numerical simulation , DPM , Thermal desalination”