Research On Numerical Simulation And Engineering Application Of Pure Oxygen Ignition System

Pure oxygen ignition is a late-model energy saving technology which combines the tiny-oil technology with the oxygen combustion-supporting technology. It can intensely reduce the fuel consumption when the boiler is in the condition of cold start-up and low load state combustion. This paper adopts a study method which combines FLUENT numerical simulation with engineering application to study the actual effect of pure oxygen ignition project on 670 MW unit in power plant of A. The main Research content and conclusions are as follows.(1)This paper uses the method of numerical simulation to study the injecting oxygen scheme of center cylinder in burner and analyze the distribution of velocity field and oxygen concentration field, then summarizes the optimal design scheme of oxygen nozzle.(2)This paper uses the method of numerical simulation to study the injecting oxygen scheme of water wall and analyze oxygen concentration field distribution, then the best installation angle and the oxygen flow rate had been given.(3)This paper uses the method of numerical simulation to study the condition of the pure oxygen burner ignition and analyze the temperature field distribution、volatile distribution、 burning-out quantity of carton, then the best parameters keeping pulverized coal air flow firing stability had been given.(4)This paper uses the method of engineering application and experimental measurement to study the actual effect of pure oxygen ignition project on 670 MW unit and measure the flame temperature of the burner exit and oil content and fly ash carbon content in exhaust fume.The conclusion and achievement of this paper provide reference and technical experience for pure oxygen ignition transformation project in coal-fired power plant.