Control device for nitrogen oxides of explosion-proof diesel engine for coal mine

The utility model discloses a control device for nitrogen oxides of an explosion-proof diesel engine for a coal mine, which belongs to the technical field of EGR (exhaust gas recirculation) valves and comprises an explosion-proof engine and a waste gas treatment box connected with the explosion-proof engine, and an exhaust port of the explosion-proof engine is connected with the waste gas treatment box through a gas inlet pipe. An exhaust port of the waste gas treatment box is connected with an EGR valve body through an exhaust fence and a water-steam separator and then connected with an air inlet of the explosion-proof engine through a supercharger. When the explosion-proof engine begins to operate, the EGR valve body controls the amount of waste gas entering the front gas inlet pipeline of the supercharger, the combustion temperature is reduced, generation of oxynitride is reduced, the water-steam separator controls the amount of water entering the front gas inlet pipeline, combustion is participated on the