Method and arrangement for injecting an emulsion into a flame

A method for injecting an emulsion of a first fluid and a second fluid into a flame of a burner, wherein the burner comprises:

• a central gas duct extending along a longitudinal central axis from an upstream end to a downstream end,
• an outer gas channel disposed coaxially with the gas duct,
• a fluid channel disposed coaxially between the gas duct and the outer gas channel forming a downstream contracting annular fluid channel,
• wherein the central gas duct and the fluid channel are separated by a first frustoconical wall, which, at a downstream end, terminates with an annular inner lip,
• wherein the fluid channel and the outer gas channel are separated by a second frustoconical wall, which, at a downstream end, terminates with an annular outer lip,
• wherein the arrangement is mounted concentrically surrounding a heat source which provides, through the central gas duct, hot gases into a flame of a burner,
• the method comprising:
• introducing a mixture of first and second fluids into the fluid channel,
• swirling the mixture of the first and second fluids,
• decreasing a radius of a swirl of the first and second fluids when they meet the second frustoconical wall, thereby forming an emulsion film along the second frustoconical wall,
• sweeping a flow of swirling inner air along an inside of the emulsion film flowing along an inside of the second frustoconical wall,
• sweeping a flow of swirling outer air from the outer gas channel along an outside of the emulsion film when the emulsion film leaves the outer annular lip, and disintegrating the emulsion film by the inner air and the outer air when they meet the emulsion film downstream of the outer lip.