Method and annular burner for spraying aqueous additive suspension in the central portion of an annular burner

摘要

A method and annular burner for binding sulfur and other impurities during the combustion of fuels that contain such impurities. The fuel is burned in an annular burner flame that has an internal recirculation zone. An additive in the form of an aqueous suspension is sprayed into the combustion chamber via at least one two-component atomizing nozzle, and the additive is mixed with the gases of the flame under optimum reaction conditions. In order to enable a particularly favorable binding of noxious material, an atomizing nozzle for the additive is disposed in the central portion of the annular burner, and the additive is sprayed as an external mixture, via the atomizing nozzle, along the longitudinal axis of the burner flame, as a fine or narrow stream, through the internal recirculation zone and into the flame. The flow pulse and the angle of dispersion of the additive suspension stream are selected in such a way that the additive suspension is not atomized until it reaches the optimum reaction region of the flame. The annular burner has at least one atomizing nozzle associated therewith for atomizing aqueous additive suspension. The additive atomizing nozzle is also embodied as a two-component nozzle having external mixing, and is disposed in the central portion of the annular burner.