Experimental Studies Of Oxygen-fuel Swirl Burner And Numerical Simulation In The Furnace

In recent years,the environment pressure is getting bigger and bigger, the greenhouse gas emissions,which particularly means carbon dioxide,seriously restricted the sustainable development of the whole human society and caused great negative impact on the ecology and climate in global scope. In China, coal based energy structure is difficult to be adjusted in the near future, so there is a strong sense of social reality to study the control of carbon dioxide emissions. As a new kind of technology, oxygen-enriched combustion technology(oxy-fuel) can achieve carbon capture effectively and help to control the emission of contaminants.Combining the technical characteristics of the 0.3MWth directly oxygen swirl burner,and considering the actual situation of the 35 MWth oxygen enriched combustion carbon capture project in Yingcheng, Hubei Province, a new kind of oxygen enriched coal burner which equipped with push rod in outer secondary air cyclone was designed. The air cyclone which is right angled trapezoid can control the proportion of airflow coming through the blade, then the swirling intensity is changed and the whole flow field get regulated. The cold test which innovatively apply temperature tracing and infrared temperature measurement showed the whole flow field intuitively, so the impact of the moving of secondary air cyclone and the size of the first wind get revealed. Finally, the numerical simulation of the burner and the combustion process in the furnace proved that the design of the burner meet the requirements of the 35 MWth boiler combustion well.Research results show that the burner has good air dynamic field, and movement of the outer secondary air cyclone can effectively regulate the swirling intensity, and influence the development of the whole flow field, the inner secondary air with oxygen injection, mixed well with first air. The characteristics of flow field of the burner, such as the relative length and width of the recirculation region, the starting position, as well as the reflux area as a whole mix, showed regular changes with the variation of the outer secondary air swirl intensity and the first wind. The burner can achieve good combustion effect under different kinds of coal burning situation.