Study On Combustion Characteristics Of Coal At Oxygen Enriched Condition By Thermogravimetric

At the present,oil was used to fire or combustion supporting in the pulverized coal fired boiler of fuel electric plant in the world by and large. so a more economical and applied method is necessary. Study of the combustion characteristics of pulverized coal at oxygen enrichment conditions is very important not only for combustion but also for ignition.The paper choose brown coal , bituminous , dry-burning coal ,anthracite,blended coal from brown coal and anthracite and blended coal from bituminous and anthracite for five density of oxygen(21%,30%,40%,70%,100%) and make the oxygen-enrichment combustion tests in the thermogravimetric apparatus. And has analyzed Dynamic parameters of four coals combustion for different density of oxygen.Experimental investigation has proved:(1) The density of oxygen has the effects on TG and DTG curves of coals. With the density of oxygen increases,TG and DTG curves of all pulverized coals move to the lower temperature zone,and with higher the density of oxygen,the lower the ignition temperature and burnout temperature is,in addition,Maximum mass loss raises will increase as the density of oxygen increases. Its combustion characteristics can be improved much more. (2) Combustion phenomenon of the blended coal with different oxygen density is same besides above several with the single coal,with blends along with the coal of different property blends also can appear the different combustion phenomenon. An difference bigger brown coal and the anthracite blends,TG and DTG curve can appear the partition,and combustion partition phenomenon can be more and more obvious along with the oxygen density increases,when the oxygen density is bigger it can appear the obvious platform in the low temperature and the high temperature section. When difference smaller bituminous and anthracite blends,the blended coal Ignition-temperatures is situated between two kind of single coals,Maximum mass loss raises is smaller than two kind of single coal. Ignition-temperatures of blended coal increasing is quicker than two single coal by increasing density of oxygen. (3) The single coal burning dynamics parameter solution result showed that,along with density of oxygen increasing,activation energy increases.