Experimental Investigation Of Oxygen-enriched Combustion Characteristics Of Lignite

Lignite is a low degree of metamorphism coal resources,it is rich in the area of Inner Mongolia and occupies 75% of coal resource in china. As the coal quality distribution of higher moisture and lower-heat-value,its wide utilization is restricted and now main used to generate electricity. Study on oxygen-enriched combustion of lignite and consolidates its combustion characteristics have important realistic significance in raise the utilization rate of lignite and can solve the energy supply shortage status in china.The paper choose four areas of lignite about ordos,huolinhe,yiminhe and baiyanhua,and make the oxygen-enrichment combustion tests in thermogravimetric apparatus for four density of oxygen(20%、30%、40%、60%). As analyzed on curves of TG,DTG,DTA,study on the influence to the density oxygen of the combustion of lignite.Experimental investigation has proved:(1)With the density of oxygen increases,TG and DTG curves of four different lignite move to the lower temperature area,the time of combustion is shroten and mass loss rate increased. (2)DTA curve signify the thermal effects of the combustion. With the density of oxygen increases,DTA curves of four different lignite move to the lower temperature area too,thermopositivepeak has been narrowed,heat release rate increased,heat release intensity is raised.(3)The ignition temperature,maximum mass loss rate temperature and burnout temperature are lower as the density of oxygen increases. The level of lower about burnout temperature is more faster than ignition temperature,so the combustion area is shroten.According to the study of above,base data on the extensive utilization of lignite can be received.