Method of reducing cement kiln NOx emissions by water injection

摘要

A method and apparatus are disclosed for reducing total NOx emissions from a cement kiln. The method includes the step of injecting water into the flame of the kiln at a point proximate the initial ignition point of the burner. The apparatus includes an injection nozzle for injecting water into the burner flame. Also disclosed is an improved process for making cement clinker. The process includes the steps of burning fuel to generate a flame within a kiln, injecting water into the flame to control formation of nitrogen oxides within the kiln, introducing a mixture of cement raw materials into the kiln, and reacting the raw materials to form cement clinker.