An equalizing plate was installed inside the spray drying tower where was of 120mm far away from the tower top

to optimize the flow and temperature field.By experiment the factors affecting the temperature distribution and purification efficiency of flue gas generated from municipal solid waste(MSW)incineration was investigated.The results showed that:the temperature of down flow flue gas in the upper part of the spray drying tower decreased rapidly

and slowly in the middle and bottom part

and the gas temperature was well-distributed in radial direction;the purification efficiency of flue gas increased with the stoichiometric ratio and opening area diameter of the equalizing plate;with an increase in inlet gas temperature

the removal rate of SO2increased significantly

while that of the HCl changed little;as the flue gas speed rising

the capture efficiency of Ca(OH)2slurry droplet on SO2and HCl both decreased

and that on SO2dropped more.