Burning system of heavy oil boiler and method thereof

The invention discloses a burning system of a heavy oil boiler and a method thereof. The burning system comprises an air inlet pipe, an air fan, more than one air box placed on the outer side of a hearth, burnout air spouts formed in each air box, a plurality of burners and igniters, wherein each burner comprises an atomized oil gun, a primary air pipe and a secondary air pipe which are arranged in a sleeving way from interior to exterior, the atomized oil gun comprises an oil pipe and a nozzle which are connected, and the front end of the primary air pipe is provided with a combustion stabilizer; the secondary air pipe is internally provided with a rotational flow device, the front end surface of the nozzle is concentricalally provided with two circles of nozzle holes, each circle of nozzle holes comprises a plurality of nozzle holes which are formed in an equidistant manner, the two circles of nozzle holes are formed in the periphery at intervals, and the hole diameters and spray angles of the outer circle of nozzle holes are larger than those of the inner circle of nozzle holes; and an economizer outlet of the boiler is also connected with an air inlet pipe through a flue gas recirculation pipe, and the flue gas recirculation pipe is provided with a circulating fan. As the burning system and the method are used, the generation amount of nitrogen oxide is greatly reduced, more and more environmental requirements are met, and the burning system of the heavy oil boiler and the method thereof respectively have a relatively wide market prospect.