Influence And Analysis About The Properties Of Combustion And Fouling Of Black Liquor Coal Slurry

The papermaking black liquor is substance which can lead the water environment to be polluted.That will spend a lot of manpower and material resources if we need to deal with papermaking black liquor.And that it contains a lot of material which can be reused such as lignin,cellulose,humid acid,organic matter,etc.If we does not recycle these material,which can not only waste a lot of water resources,but also can persecute our survival environment,and endanger human body health.Therefore,it is very significance that reuse the papermaking black liquor,which can limit the water environment pollution and ease the tension of water resources.Data show that papermaking black liquor contain a lot of dispersing agent and stabilizer,which is additive necessary for preparation of coal water slurry.Therefore,under the condition of electric mixer with the rotating speed of 1200 r/min,After 15 minutes the pulverized coal mix with black liquor,which stir into the black liquor coal slurry preparation.But in China,the experimental research about the preparation of coal black liquor slurry papermaking black liquor is not much.Even though some scholars have conducted the research.which haven't really into practice.In the paper,the author studies on pulp black liquor coal at the Jiangsu changfeng papermaking co.,LTD.First,we mixed papermaking black liquor with coal.Respectively from the perspective of micro and macro,I carried on the comparative research and analysis burning mechanism between black liquor coal water slurry,coal slurry and ordinary pulping of the raw coal,which aim to explore combustion characteristic and defiled slagging mechanism of the papermaking black liquor coal slurry.One of the emphasis of the pulp black liquor coal is combustion performance and defiled slagging characteristics.The purpose is to investigate feasibility of coal black liquor slurry in industrial applications as well as the existing problems.The test results both thermo gravimetric analysis experiment and circulating fluidized bed furnace combustion show that the coal black liquor slurry viscosity is low,good flow and atomization performance,which can easily catch fire because of the papermaking black liquor contains a lot of lignin and Na group compounds such as organic composition,low ignition temperature,combustion time is shorter,the combListion state is sufficient stability,etc.Flue gas analysis feature test results show that the pulp black liquor coal combustion process,the release of the NOx in flue gas,especially NO2,SO2 content and carbon concentration are far below the ordinary coal-water slurry and slurry-making raw coal.Thus,black liquor coal slurry has a more significant and broad prospect of application,which more benefits economic and environmental.The test of ash melting characteristics results show that the ash of black liquor coal slurry initial deformation only 1067?.The softening temperature,hemisphere temperature and flow temperature are 1121?.1208? and 1260? respectively.But,the ash of coal water slurry initial deformation temperature is 1277?.Softening temperature,hemisphere temperature and flow temperature are 1355?,1361? and 1389? respectively.By XRF and X ray diffraction experiment contrast analysis find that the reasons of lower pulp black liquor coal ash melting point is the ash contains a lot of low melting point of nephcline and anhydrous glauber's salt,etc.In this paper,experimental study and conclusion can lay a foundation for the research of coal black liq-or slurry technology,and provide reference for the design of the black liquor coal slurry combustion equipment and guidance.