Technical principle of pulverized coal combustion without flame oxygen combustion

Oxygen and fuel mix into the combustion chamber for combustion, the generated flue gas into the recirculation flue gas channel, again into the combustion chamber for combustion, cycle many times, so that the fuel is fully burned, improve the combustion efficiency, reduce the emission of NOx and soot in the combustion products, to achieve clean combustion and efficient combustion.

Because thermal NOx and fast NOx are derived from nitrogen in the air, oxygen is used as oxidant, so that the generated NOx is mainly from the N in the fuel, that is, fuel NOx, so it will greatly reduce the total emissions of NOx.

Oxygen-coal flameless combustion technology is generally divided into three zones: diffusion zone, diffusion dynamic zone and chemical reaction dynamic zone. The combustion process of diffusion zone and diffusion dynamic zone is determined by material diffusion or partial material diffusion, which is manifested as the occurrence of flame, such as oxygen and coal flame combustion technology. Oxygen-coal flameless combustion technology works in chemical reaction power zone.

Oxygen coal combustion technology of pure oxygen by liquid oxygen gasification, high pressure liquid oxygen can easily get close to the speed of sound of oxygen jet, flameless combustion technology of flue gas oxygen coal outside loop is used to dry pulverized coal and conveying pulverized coal, the flow rate is needed for combustion oxygen flow rate of 1 times or so, around 200 m/s in the hearth of the secondary air oxygen jet pulverized coal jet, the entrainment CO2 a wind At the same time, due to the large slip speed between pulverized coal and flue gas, the full premix of pulverized coal and oxygen can be achieved instantly.