techical.docx

techical.docx

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techical

IncineratorintheprecessofburningwillproduceNoxinfluegas,Theconcentrationgenerationgenerallyisabout100~350mg/Nm3.ThepreferredsolutiontoreduceconcentrationofNoxisthelowNoxcombustiontechnology.Thattechnologyincludeslowtemperaturecombustion,gradingairsupply,strengtheningthecharactristicsoflowexcessaricoeffcient.Theprojectselectedthetypeofincineratorhasthecharacteristicsoflowexcessaircoeffcient,andusedthehierarchicalsupplyairtechnologytoreduceNoxgeneration.Atthesametime,weusedselectivenoncatalyticreductiondenitrationofNoxinfluegastoemissionwithnationalstandard.

Sprayedtheureasolutiontothefluegasofincineratorthattemperatureis850-1050℃.Itwilldecomposethenitrogenoxideinfluegasbelowtopublicnuisance.Ureasolutionisusedair-atomizingNodenitrationcatalystchemicalreactionisasfollows:

（NH）2CO+H2O→2NH3+CO2

4NO+4NH3+O2→4N2+6H2O

Itwillbeset4sprayersforureasolutionatomizing.UreawaterdilutedwillbespraytothefirstfluepipetoreduceNOX.

Thefluegasblowformtheendincineratorthroughthebottomintoacidstrippingtowerwheretheacidgasinfluegasreactwithhydratedlimepowderthatinjectedproducedvulcanizationturbulence.Atthesametime,injectwatertohumidifyhydratedlimesolidpartioninthebottomoftowerthatmakethealkalineparticlesandacidisgasabsorption,gethighacidabsorbenteffciency.MostofSO2,HCLetc.acidgaswillbedesorptionthenthefluegasdischargedfromthetopofacidtowerblowintobagtypecollector.

Injectactivatedcarbontothefluepipeafteracidtowerandmakeitevenlydispersedinfluegas.Itwilleffectiveadsorptionofheavymetalsanddioxinsinfluegas.

Bagtypedustcollectorfullyfilteredfluegasandremovedthedustandharmfulmaterial.Thecleanfiuegasinducedthroughdraftfanintothechimney.

Processproducedby-productstheacidremovedashlikedrypowder,itschemicalcompositionishardtodissovedsuchasCaSO3,CaSO4,Cacl2andflyashthatsuitableforinvalidminebackfill,roadfoundation,etc.

5.52Equipmentforfluegaspurificationsystem

5.5.2.1SNCRdenitrationsystem

Denitrationdevicewithoutcatalystisdissolvedinwater,ureaparticlesmadeof40%ureaaqueoussolution,andthenintotheincinerator,theremovalofnitrogenoxidesintheincineratorequipment.ThissystemcanbesetasidetogetalowconcentrationofNOxemissionvalues.

Thissystemincludesthefollowingequipment:

Ureasolutiongeneration/storagetanks

Blender

Heater

Ureasolutionfeedpump

Dilutionwaterfeedpump

Ureasolutionpipelineblender

HoistcraneinSNCRroom

Theureasolutionspraynozzle

Valveandinstrument

Ureasolutiongeneration/storageequipmentcontrolcabinet

Theureasolutionspraynozzlecabinet

Formodulatetheureasolutionofconcentration40%toinstallaureasolutiongeneration/storagethanksTheBlenderandHeaterisinordertoeffectivelydissolvedtheureagranulesthatcontrolledbutheureasolutiongeneration/storagetankscontrolcabinet.AccordingtheconcentrationofNOxatthechimneybreast,theureasolutionfeedpumpsuppliedtheureasolution.

ThefolwofureasolutioniscontrolledbyDCS.TheDilutionwaterfeedpumpisinordertosuppliedthetapwatertodilutetheureasolution.TheureasolutionsuppliedbytheureasolutionfeedpupmthattapwaterspraythenstirredandmixedduringtheUreasolutionpipelineblender,fedtotheureasolutionspraynozzle.

5.5.2.2DeacidificationTower

DeacidificationTowisthemainunitofthefluegaspurificationsystem.Installonedeacidficationtowertoeachincinerationlines.thedeacidificationtowerinstalledbetweenincineratorandbagtypedustcollectorwhichincludefluegasentrance,venturigasejectordevice,tower,fluegasstacknozzle,Theacid-proofpouringmaterialbeappliedintothedeacidificationtower,aluminumsilicatebespreadonexternaltoinsulationandprotectedwithsteelplate.Calciumhydroxidepowerspraynozzleandwaternozzleinstalledinthedeacidificationtower.Incaseofcondensation,thedeadcidificationtowerhastobeinsulation.Installedacinder-valveonthebase.

5.5.2.3Cyclonedustcollector

AsforthebagtypePPSmatreialsdustfilter,theuseoftemperationlimitisabout180℃.Becausetheblackstrawproducedinthecombustioninthefurnace,andtheoxygencontentintheflueisnotsnoughtoburnagain,thelargerdustbecauseoffluegasheatexchangeinashorttimewillburnagain.Inaddition,duetotheproblemofboilersluggingandcorrosion,fluegastemperaturecanbegreatlyimproved,ifgreaterofthetemperature,inthepresebceofunburnedcarboninflyashminghtcauseafirehazard.Inordertoaccumulateinclothandthesparkcausedbycombustiontoreduceparticulatematter,cyclonedustcollectorcanbeusednearbagtyoedustcollector.

5.5.2.4Bagtypedustcollector

Afterthegasdistributionplateevenlythroughintothebag,heavierparticleswilldropintothehopper.Gasflowsthroughthedustbag,theseparatedpartitiesretainedontheoutsideofthebag,andcleanthesmokethegasexitofeachcompartmentdust.Dustygasfromthenozzleintothefilterchamberofeachunit,bysettinginthehopperintothewinddeflectorontheunitforareasonableallocation,makingtheentirefilterindoorairdistribution,gaslifttoensureareasonablespped,themaximumreducesturbulencetoincreasefiltrationareautilizationandsystemresistanceisminimized.Whileavoidingthebagshaking,collision,frictionandprolongtheservicelifeofthebag.

Thebagtypedustcollectorisrightandleftsidesymmetricaldoublerowlayoutandverticalhungintheroundcageframe.Dustfilterbagiscleanedbydrycompressedairpulsesregularly,sothattheresidualdustbagfallingdown,andcollectedinotthedischanrgehopper.

Thebagtypedustcollectorincludedpulsevalve,bagfilterandsoon.Thedusthopperbeinatalledwithelectricalheatingdeviceincaseofdusthardenthattoensurethedustremove.

5.5.2.5Hydratedlimeinjectionsystem

Hydratedlime（Ca（OH）2）storedinstockbinthatinstalledonceforeachdeacifidicationtower.Hydratedlimetransportedtostockbinbytankertruck,thenequablyfedbythestarrotationfeedingvalveinstalledatthebottomofstockbin,Thehydratedlimepowerbemixedwiththeacidagentfeedbackthatfellfromthefluegasseparatoratthedeacidificationtowerexitbytherootsblowerandgasificationchute,thenthemixbeblowbacktothetower,andpulverization,reactionwiththeacidicgastobeabsorbedtheharmfulacidicgas.

5.5.2.6Activatedcarboninjectionsystem

Suchasheavymetals,thedioxinpollutantinfluegasisremovedbyactivatedcarbonfromfluegas.Installone3m3activatedcarbonstockbinforeachsystem.Manualfed,thenequablyfedbythestarrotationfeedingvalveinstalledatthebottomofstockbin,theactivatedcarbonbeequablyblowtoflueofthereactiontowerexitbyrootsblower.

5.5.2.7Waterinjectionsystem

Thewaterinjectionsystemincludeatomizingnozzle,processwatertank,waterpump（2t/h）,electromagneticregulatingvalve,pipelinesandcontrolsystem,.Theatomizingsystemisinstalledatexitofventuriintowerthatequippedwithasuperfineatomizingnozzle.Accordthetowerchangeoftemperatureandconcentrationofacidgasestocontrolwaterinjectionflow.Sotherebeinstalledtemperaturemeasuringpointattheexistofthedeacidificationtower.

5.5.3Fluegaspurificationsystem

（1）Fluegaspurificationsystemincludeddeacidificationtowerandaccessoryequipment,bagtypedustcollctor

（2）Thecharacteroffluegasdischargeontheexhaustofpurification

ThebuiltstandardofMSWincinerationgenerationpowerplantoberservetheEUEnvironmentProtectionLaw,fluegaspollutiuondischargeemissionstandardoberservetheWasteIncinerationLaw2000/76/EC.

Concentrationpffluegaspollutantsdischargetable

Item

Unit

EUStandard

Dust

Mg/Nm3

10

NOx

Mg/Nm3

200

SOs

Mg/Nm3

50

HCL

Mg/Nm3

10

HF

Mg/Nm3

1

Hydrocarbonsintotal-HCT

Consideredmethane

Mg/Nm3

10

Cd,T1andthemixture

Mg/Nm3

0.05

Mercuryandmixture

Mg/Nm3

0.05

Pb、As、Co、Ni、Cr、Cu、Mn、Sb、Vandmixture

Mg/Nm3

0.5

Dioxins

TEQng/Nm3

0.1

5.6Ashtreatmentsystem

ThereistwokindofemissiondischargedfromtheMSWincinerationlimes.Oneisashthatdepositedandhardenedatthebottomoftheincineratorhearththatmustbedischargedintime.The45%offuleashwillbeturnedtoAsh,theother55%turnedtofluegas.Thefluegasalsoincludedactivatedcarbon,reactantandCa（OH）2Thatwasnotinvolvedinthereaction.

Ashremoversystem

Thisprojectadoptsthedryashtreatmentsystem.Includedslagremovalandashstock.Theashconveyingsystemusesinglelinelayout,equippedaashconveyortransmissioncapacitymaximum4t/h.

Installedaashexhautforeachwatercoldwind-distributionplateatthebottomofincinerator.Afterincineration,theashfellintothewatercoldrotaryscreenashremoverfromtheashexhaudt.Duringthisprocess,theashfromtheincinerationtobecoldfrom900℃to150℃below.Throughthevibratingscreenriddler,theashmorethan6mmwillbefellonbeltconveyorthentransportedtotheashstock.Theashlessthan6mmwillbegavebacktohearthbythebuckedelevatortofurnacebedpressurestability.

Themainequipmentforeachincinerationashremoversystemasfollowing:

（1）Beltconveyor4set

（2）Linearvibratingscreen2set

（3）De-ironingseparator1set

（4）Ashstock1set

（5）Rotaryscrenashcooledmachine2set

（6）Feedmaterialbacksystem2set

5.6.2Flyashourificationsystem

Aftertheflyashthatfromtheincineration