BIO OIL BURNER WITH OIL NOZZLE

A bio oil burner comprises an oil lance, at the end of which there is an oil nozzle with spray holes for feeding atomized oil to a furnace of a boiler. The bio oil burner further comprises a first cylinder which together with the oil lance delimits an annular primary air flow channel; a second cylinder which together with the first cylinder delimits an annular secondary air flow channel, and a third cylinder which together with the second cylinder delimits an annular tertiary air flow channel. In addition, the bio oil burner comprises a primary air swirler annularly surrounding the oil nozzle and blocking at least part of an outlet of the primary air flow channel. The oil nozzle has 6 - 50 spray holes which are distributed on a slanting circumferential surface of the oil nozzle in such a way that said spray holes form at least two groups of spray holes in which the spray holes are located at a regular spacing from each other, and that between said groups of spray holes there are intermediate spaces in which no spray holes are present. A free end of the first cylinder is provided with a flame stabilizing ring which surrounds the outlet of the primary air flow channel and blocks part of an outlet of the secondary air flow channel. The outer diameter D i of the primary air swirler is calculated by the formula D i = a · D 1ry , wherein a is 0.45 - 0.6 and D 1ry is the inner diameter of the first cylinder.