ACTIVE CONTROLLED SUPER ULTRA LOW NOX WATER TUBE BOILER USING FGR AND OXYGEN CONCENTRATION CONTROL

摘要

The present invention relates to an active control type supersonic knock type water tube boiler using exhaust gas recirculation and oxygen concentration control. In order to achieve the same performance in the full load operation of the boiler, the oxygen concentration of the secondary combustion air is constantly controlled and nitrogen oxide (NOx) in the boiler combustion chamber by increasing the exhaust gas recirculation rate. The active control type super low-knock water- The boiler comprises a boiler body (10); an exhaust gas recovery means (20) for recovering exhaust gas generated in the boiler body; a secondary air supply means (30) for supplying air for mixing with the exhaust gas recovered by the exhaust gas recovery means; a mixing means (40) for mixing the exhaust gas recovered by the exhaust gas recovering means and the air supplied through the secondary air supply means to supply secondary mixed air to the boiler body; and outside air supply means (50) as an oxygen concentration adjusting means for adjusting the oxygen concentration of the combustion air supplied to the boiler body through the mixing means, wherein the oxygen concentration of the secondary mixed air is measured, the oxygen concentration of the combustion air supplied to the boiler body is set by controlling at least one of the exhaust gas recovery means, the secondary air supply means, the mixing means, and the oxygen concentration control means by a program to thereby reduce nitrogen oxides through stabilization of the flame.;COPYRIGHT KIPO 2018