Method and arrangement for monitoring performance of a burner of a suspension smelting furnace

A method for monitoring performance of a burner of a suspension smelting furnace,

• wherein the burner is arranged at the top structure of a reaction shaft of the suspension smelting furnace and wherein the burner having
• an solids feeding channel that has a solids outlet opening up into the reaction shaft for feeding solids into the reaction shaft, and
• a reaction gas channel having a reaction gas outlet opening up into the reaction shaft of the suspension smelting furnace for feeding reaction gas into the reaction shaft,
• wherein the solids feeding channel of the burner being radially limited by the solids feeding channel wall and that has a solids outlet opening up into the reaction shaft for feeding solids into the reaction shaft, and
• wherein the reaction gas channel of the burner being an annular reaction gas channel that coaxially at least partly surrounds the annular solids feeding channel and that has a reaction gas outlet in the form of an annular reaction gas outlet opening up into the reaction shaft of the suspension smelting furnace for feeding reaction gas into the reaction shaft,
• wherein
• by providing at least two imaging means,
• by arranging the imagining means symmetrically with respect to a vertical center line A of the burner,
• by producing an image representing the cross-section of the reaction gas channel by means of at least one imaging means, and
• by receiving the image of the cross-section of the reaction gas channel from the imaging means with a processing means.