Internally induced flue gas recirculation system having high efficiency reaction performance by inversed injection of gas or air

摘要

The present invention relates to a flue gas recirculation system (hereinafter also referred to as "FGR system") applied to various types of industrial furnaces, and according to the present invention, Conventional gas recirculation (FGR) systems, which are configured to reduce pollutants such as NOx by reducing the temperature of the combustion chamber by increasing the flow rate of the combustion gas by circulating the exhaust gas at the downstream end, In addition, there are still problems such as clinker generation, boiler tube corrosion, and wall damage due to local overheating of the combustion furnace wall. In addition, there are many problems such as corrosion in the FGR nozzle piping due to the acid gas contained in the flue gas By injecting high-speed gas in the downward direction from the top of the combustion chamber close to the outlet of the exhaust gas, Thereby forming a completely mixed region in the combustion chamber to maximize the reactivity and uniformity of heat transfer and reduction of pollutants such as CO and NOx by forming a uniform temperature distribution There is provided a reverse gas recirculation system having high efficiency reaction performance by internal induction flow recirculation.