This device is used for working conditions such as high acid gas in the fume or during the maintenance of the atomizer. In order to ensure that the fume temperature and indicators can be controlled within the emission standards, this device sprays caustic soda solution into the fume to achieve the function of temperature regulation and removal of some acid gases. In Order to ensure the atomization effect of caustic soda solution, the spray gun is set in the upper part of the reaction tower, and the caustic soda solution sprays in the same direction as the fume flow direction and flows downwards. In this way, it ensures that the fume is in contact with the caustic soda solution for a long time, so as to make sure that the temperature of the fume after cooling is uniform and all the water is completely evaporated into water vapor.