The full model numerical simulation of super large-scale cooling tower for partition water distribution system

The packing area of a super large-scale natural draft wet cooling tower (SLNDWCT) is enormous and partitional water distribution method is adopted in engineering, which the water distribution pipelines get longer and wind resistance increases in the inner area of the tower. The numerical simulation method based on conventional towers with uniform water distribution and air distribution is no more applicable. In this paper, the numerical simulation model for heat and mass transfer of gas-water two-phase is established for SLNDWCT. Based on the calculation results of spray pipe network, partitional water pressures are considered in simulation by UDF, and three typical season cases of real tower verified the accuracy of the model. Besides, based on different water distribution methods (different distances for air intake in outer zone and different water spray rates), simulations are used to study the spray water rates (inner and outer zones) cooperating with the air intake distance in outer zone, as well as the two factors inuencing the water temperature of cooling tower. And the heat exchange efficiency is assessed by analyzing the average water temperatures of inner and outer zones in the tower pond. © 2016, Science Press. All right reserved.