This invention relates to improvement on a boiler in which a nebulizer is mounted at the lower part of the firebox, a filmy water generator and a collector at the upper part and a spray burner is at the middle. Fine burns utterly in a general burning tube collected from several nozzles after two times of sprays, three times mixing and two times of throttle control and exchanges heat in fog-water to get the required temp in a few seconds to save several tons or dozen tons of steel compared with gas combustion boiler. |