Because part of the diffusing oxygen cannot be fully utilized and diffused in the iron and steel enterprises

a new method of diffusing oxygen recycling was proposed

in which the diffusing oxygen is sent to the co-combustion boiler of captive power plant to form micro-oxygen-enriched atmospheres.Numerical simulation and thermodynamic calculation on the combustion process in the combined combustion boiler in micro-oxygen-enriched atmosphere were carried out

by using the Fluent software.The results show that:with an increase in the concentration of oxygen

the temperature in furnace rose obviously

which prolonged the residence time of pulverized coal in furnace

enhanced the radiation heat transfer and improved the boiler thermal efficiency.Moreover

it was helpful for co-firing of the pulverized coal and some bituminous coal with low calorific value and high ash content.