Patent ID: 6210150
Filing Date: 2001-04-03
Classification: F23D,F23L

Abstract:
A method of operating a boiler fired with a fuel selected from the group which consists of liquid and gaseous hydrocarbons, heating fuel oil and natural gas, wherein the fuel and atomizing air are supplied to a burner of the boiler to form a fuel-air mixture and the formed fuel-air mixture is burned, and wherein the atomizing air, for reducing an No.sub.x, content in the flue gases, is subjected to a moistening process prior to mixing with the fuel according to which the atomizing is contacted with a moistening liquid, said process comprising:preheating the moistening liquid prior to contact with the atomizing air to form a preheated liquid,introducing the preheated moistening liquid into an upper end of a moistening tower,atomizing the preheated liquid in the upper end of said moistening tower and forming a liquid mist,letting the formed liquid mist flow downwardly along and in contact with a contact body in the moistening tower,contacting at least in part on said contact body, in counter flow the liquid mist with the atomizing air introduced into a lower end of the moistening tower and rising therein and intimately mixing the same,evaporating at least a part of the liquid mist by the contact of said atomizing air therewith to form a vapor, andsupplying the atomizing air enriched with the vapor of the liquid mist to the burner of the boiler.