Wall sticking phenomenon usually occurs during drying of desulfurization wastewater in a 2 200 kg/h spray tower of a 350 MW unit

affecting the unit normal operation. Numerical simulation is conducted on this spray tower. The influences of the distance from the center of the nozzle plane to nozzles and the atomizing angle on the wall sticking and the uniformity of outlet particles temperature and moisture content are discussed. The research manifests that

under the design condition

the maximum moisture content of particles at the wall surface increases at first and then decreases from the top of the tower down. The maximum moisture content of the particles at 17.5～21.2 m of the wall exceeds 5%

implying the wall sticking probability is extremely high. The optimal analysis shows that the most appropriate distance from the center of the nozzle plane to nozzles is 1.18 m and the most appropriate atomization angle is 41.43°. Compared with the design condition

the optimized wall moisture content averagely declines by 4.36% from top to bottom

the moisture content CW of outlet cross-section particle and the temperature standard deviation coefficient CT decreases by 4.9% and 8.3%

respectively

and the average and maximum moisture content of outlet particles decreases by 4.5% and 3.9% separately

indicating the optimization effect is dramatic.