Nozzle lance, combustion plant and method for exhaust gas treatment

A method for exhaust gas treatment in a combustion plant comprising:

• injecting a fluid with an active substance by pressurized gas through several nozzles or nozzle lances into a common exhaust gas chamber of the combustion plant, wherein the fluid is a fluid mixture of an admixing fluid and an active fluid with the active substance, wherein a temperature and/or a pollutant concentration is measured in the exhaust gas chamber and a quantity or concentration of the active substance in the atomized fluid is adjusted or controlled as a function of the measured temperature and/or pollutant concentration,
• wherein in a temperature range of the exhaust gas between 850° C. and 1150° C. the quantity or concentration of the active substance in the atomized fluid is varied steplessly,
• wherein a first temperature T1 and a second temperature T2 are in the temperature range between 850° C. and 1150° C., T2>T1 and the quantity or concentration of the active substance is monotonic increasing in a first temperature range TB1 between the first temperature T1 and the second temperature T2, and
• wherein a third temperature T3 is in the temperature range between 850° C. and 1150° C., T3>T2, and the quantity or concentration of the active substance is constant in a second temperature range TB2 between the second temperature T2 and the third temperature T3.