简介:Thespecialdesignforthefurnaceandburnerofboilersburningligniteisanalyzedandthetypeselectionofthepulverizingsystemisdiscussedbytakingaccountofthelignite’scharacteristicsofhighmoisture,lowheatingvalueandlowashfusiontemperature.Theimpactofsuchcharacteristicsonthetypeselectionofburningequipmentandpulverizingsystemsfortheligniteboilerisstudied.Thevaluerangesofthefurnacecharacteristicparametersfortheligniteboilerarerecommended.Fortheoldlignite,thepremixperiodintheburnershouldnotbetoolonginordertoavoidslaggingandthevelocityoftheprimaryairissuggestedtobebetween17m/sand22m/s.Thedirect-flowburnerwithtangentialfiringispreferredforlignitewiththemoisturehigherthan35%.Themedium-speedmillisbettertobeusedforlignitewiththemoisturelessthan35%,whileforlignitewiththemoisturehigherthan40%thefanmillshouldbethefirstchoice.
简介:TheformingtemperatureofClinkermeltunderdifferentburningconditionshasbeenstudiedbyappearanceexaminationandthermalshrinkerdetermination,andtheviscosityofmelthasbeendiscussedbystudyingthecoordinationnumberofAl3+andFe3+incementclinkerburnedbydifferentmethodwithx-rayfluorescenceanalysisandMoss-bauerspectroscopy.Theresultsshowthattheclin-kermeltunderrapidburningmaycomeintoexis-tenceatlowertemperatureandIt’sviscosityislower.Sotheformingprocessesofclinkermaybedifferentatrapidburningfromordinaryburning.Theyareprobablyanimportantfactortopromotetheformationofclinkerburnedatlowertemperaturewithrapidburningmethod.
简介:Thetypeselectionofburningequipmentforboilersisaffectedsignificantlybytheslaggingcharacteristicsofcoal.Basedontheengineeringstatisticsmethod,thedesignedfurnaceparametersareobtainedfromthe600-MWand1000-MWboilerswithtangentialfiringandwallfiring.Thepowerandarrangementoftheburnersareanalyzed.Theirimpactsonslaggingonheatingsurfacesandthecarboncontentsintheashandcindersarealsodiscussed.Thermalparametersoffurnacearerecommendedforboilersof600MWand1000MWfiringslaggingcoalinthedesign.Thestaticorrotaryclassifiershouldbethefirstchoiceforthepulverizingsystem.
简介:Basedonpremixedflame,thetheoreticalmodeloftransportpropertieswithtemperaturevariationwasestablishedinsideapreheatedzone.Lewisnumberofthedeficient-to-stoichiometrichydrocarbon/airmixturehasbeentheoreticallypredictedoverawiderangeofpreheatedtemperature.Thesepredictionsarecomparedwiththeexperimentaldataontransportpropertiesthatexistinthelitexature.TheresponseoftheburningvelocitytoflamestretchcanbeparameterizedbythelaminarflamespeedandMarksteinlength.Therefore,ifthelaminarflamespeedandMarkateinnumbercouldbeaccuratelysimulatedbyusingananalyticexpressionofcharacterizedtemperature,equivalenceratio,andLewisnumber,theresultsareapplicabletothepredictionofmethane,acetylene,ethylene,ethane,andpropaneflames.Expandingpreviousstudiesontheextinctionofpremixedflamesundertheinfluenceofstretchandincompletereaction,theresultswerefurtherclassifiedandrescaled.Finally,itcouldbeinferredthatparameterpq,therescaledextinctionKarlovitznumbercouldbeusedtoexplainthedegreeofflamequench.
简介:InChina,PinuspumilaismainlydistributedinDaxing’anling,whilethosegrowingintheeasternDaxing’anlingareprimarilycoveredunderthejurisdictionofHuzhongForestBureau.P.pumilaisanevergreenshrub,3-6mhigh,andalwaysgrowsvigorously.Itstrunkscreepalongtheground,usually10mlongormore.Itiseasilyflammablebecauseofthelargeamountsofresinsandvolatileoilsinitsbody.Attackingforestfiresisadangerouswork,especiallyinP.pumilascrubs.ThefiresinP.pumilas...
简介:Background:ConcernshavebeenexpressedaboutpotentialtoxicityofthesmokeproducedbytheburningofmoxaintraditionalChinesemedicine.Withtheadventofstrictanti-smokinglegislationintheUK,itwasdecidedtotestthevolatilesproducedbymoxibustionandcomparethemwithcurrentagreedsafeexposurelevels.
简介:Thedeterminedresultsofthesulfurcontentsandisotopiccompositionofcoalsamplesfrommajorcoalminesin15provincesandregionsofChinashowthatthecoalminedinthenorthofChinaischaracterizedbyhigher^34Sandlowersulfurcontent,butthatinthesouthofChinahaslower^34Sandhighersulfurcontent.Duringthecoal-burningprocessinbothindrstrialanddailyuseofcoalasfuelthereleasedsulfurdioxideisalwaysenrichedinlightersulfurisotoperelativetothecorrespondingcoal;theparticlesarealwaysenrichedinheaviersulfurisotope.Thediscussionontheenvironmentalgeochemicalsignificanceoftheabove-mentionedresultsalsohasbeenmade.
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简介:中文摘要:通过对生产工艺的改进与调整达到对乙烯焦油和天然气最大化的利用,从而达到节约成本提高效能的作用。