Method for controlling carryover in a chemical recovery boiler and a chemical recovery boiler

A method for controlling carryover in a chemical recovery boiler, the method comprising the steps of:

• feeding black or brown liquor to a furnace of the chemical recovery boiler through an injection gun to burn the black or brown liquor, wherein the chemical recovery boiler comprises a bullnose, which narrows the furnace, and a first superheater, of which at least a part is arranged at a higher vertical level than the bullnose,
• measuring information indicative of a spatial temperature distribution on a cross section of the furnace, wherein the cross section is above the injection gun and below the first superheater,
• determining, by using the information indicative of the spatial temperature distribution on the cross section of the furnace, primary information that is indicative of at least one of:
• presence of carryover particles within the cross section of the furnace, an amount of the carryover particles within the cross section of the furnace, and a change of the amount of the carryover particles within the cross section of the furnace, and
• controlling a temperature of the black or brown liquor that is fed to the furnace using the primary information.