Nozzle lance, combustion plant and method for exhaust gas treatment

A method for exhaust gas treatment in a combustion plant, wherein a fluid mixture of an added fluid and an active fluid with an active substance, is injected by means of pressurized gas through multiple nozzles or nozzle lances into a common exhaust gas chamber of the combustion plant, wherein a temperature is measured in the exhaust gas chamber and a quantity or concentration of the active substance in the atomized fluid or fluid mixture is adjusted or controlled dependent on the measured temperature, wherein the quantity or concentration of the active substance is increased as the temperature rises in a first temperature range, and the quantity or concentration of the active substance is kept substantially constant as the temperature rises in a second temperature range.