DLT 5142-2012 DLT5142-2012火力发电厂除灰设计技术规程：英文版

专用

人人文库

ELECTRICPOWERINDUSTRYSTANDARD

OFTHEPEOPLESREPUBLICOFCHINA

TechnicalCodefortheDesignof

AshHandlingSystemof

Fossil-firedPowerPlant

DL/T5142-2012

/

ReplaceDLT5142-专用2002

ChiefDevelopmentDepartment：ElectricPowerPlanningand

EngineeringInstitute

ApprovalDepartment：NationalEnergyAdministration

ImplementationDate：December1，2012

人人文库

ChinaPlanningPress

Beijing，2022

ChineseeditionfirstpublishedinthePeoplesRepublicofChinain2012

EnglisheditionfirstpublishedinthePeoplesRepublicofChinain2022

bChinaPlanninPress

rdyg

3Floor，CTower，GuohongB专用uilding

No.A11，Muxidi-Beili，XichengDistrict

Beijing，100038

PrintedinChinabyBeijingJingyintangGraphicPrintingCenter

©2012byNationalEnergyAdministration

Allrightsreserved.Nopartofthispublicationmaybereproducedor

transmittedinany人人文库formorbyanymeans，graphic，electronic，ormechanical，

includingphotocopying，recording，oranyinformationstorageand

retrievalsystems，withoutwrittenpermissionofthepublisher.

Thisbookissoldsubjecttotheconditionthatitshallnot，bywayof

tradeorotherwise，belent，resold，hiredoutorotherwisecirculated

withoutthepublisherspriorconsentinanyformofblindingorcover

otherthanthatinwhichthisispublishedandwithoutasimilarcondition

includingthisconditionbeingimposedonthesubsequentpurchaser.

ISBN978-7-5182-1432-7

Introduction

ThisEnglishversion，whosetranslationwasorganizedby

ElectricPowerPlanningandEngineeringInstitute，authorizedby

NationalEnergyAdministrationincompliancewithrelevant

proceduresandstipulations，isoneofChinasenergysector

standardsinEnglishseries.ThisEnglishversionwaspublishedby

NationalEnergyAdministrationinAnnouncement〔2021〕No.5，

datedNovember16，2021.

TheEnglishversionwastranslatedfrom专用theChineseStandard

TechnicalCodefortheDesignofAshHandlingSystemof

Fossil-firedPowerPlant

DL/T5142-2012publishedbyChina

PlanningPress.

ThecopyrightisownedbyNationalEnergyAdministration.

Intheeventofanydiscrepancyintheprocessofimplementation，

theChineseversionshallprevail.

Manythan人人文库kswouldgotothestafffromrelevantstandard

developmentorganizationsandthosewhohaveprovided

generousassistanceinthetranslationandreviewprocess.

ForfurtherimprovementoftheEnglishversion，allcomments

andsuggestionsarewelcomeandshouldbeaddressedtoElectric

PowerPlanningandEngineeringInstitute.No.65Anderoad，

XichengDistrict，Beijing100120，China.Website：www.eppei.

com.

·1·

Translatingorganizations：

NorthwestElectricPowerDesignInstituteCo.，Ltd.of

ChinaPowerEngineeringConsultingGroup

ChinaElectricPowerPlanningandEngineeringAssociation

SUNTHERIndustryDataBenchmarkingCo.，Ltd.

Translatingstaff：

NorthwestElectricPowerDesignInstituteCo.，Ltd.of

ChinaPowerEngineeringConsultingGroup：CAIYuan，

ZHENGHuimin，YUHua，KANGAijun，LIPeng

ChinaElectricPowerPlanningandEngineeringAssociation：

GUOYali，SUHonghong

SUNTHERIndustryDataBenchmarkingCo.，Ltd.：LI

Jun，LIUJianxia，LIUYuqing专用

Reviewpanelmembers：

WANGFangInnerMongoliaElectricPowerSurvey

andDesignInstituteCo.，Ltd.

XUGangNortheastElectricPowerDesign

InstituteCo.，Ltd.ofChinaPower

EngineeringConsultingGroup

QINXue人人文库SouthwestElectricPowerDesign

InstituteCo.，Ltd.ofChinaPower

EngineeringConsultingGroup

HUZhenjunNorthChinaPowerEngineeringCo.，

Ltd.ofChinaPowerEngineering

ConsultingGroup

FENGLiminEastChinaElectricPowerDesign

InstituteofChinaPowerEngineering

ConsultingGroup

·2·

YUFanCentralSouthernChinaElectric

PowerDesignInstituteCo.，Ltd.of

ChinaPowerEngineeringConsulting

Group

WANChengjunCEECGuangdongElectricPower

DesignInstituteCo.，Ltd.

ZHANGJieHenanElectricPowerSurveyand

DesignInstituteCo.，Ltd.

专用

人人文库

·3·

翻译出版说明

本译本为国家能源局委托电力规划设计总院按照有关程序

和规定统一组织翻译的能源行业标准英文版系列译本之一

，。

年月日国家能源局以年第号公告予以公布

20211116，20215。

本译本是根据中国计划出版社出版的火力发电厂除灰设计

《

技术规程翻译的著作权归国家能源局所有

》DL/T5142-2012，。

在使用过程中如出现异议以中文版为准

，，。

本译本在翻译和审核过程中本标准编制单位及编制组有关

，

成员给予了积极协助

。专用

为不断提高本译本的质量欢迎使用者提出意见和建议并

，，

反馈给电力规划设计总院

。

地址北京市西城区安德路号

：65

邮编

：100120

网址

：

本译本翻译单位：

中国电力工程顾问集团西北电力设计院有限公司中国电力规

、

划设计协会北京人人文库双泽维度信息技术有限公司

、

本译本翻译人员：

中国电力工程顾问集团西北电力设计院有限公司蔡渊

：、

郑惠民俞华康爱军李鹏

、、、

中国电力规划设计协会郭亚莉苏红红

：、

北京双泽维度信息技术有限公司李俊刘建霞刘玉晴

：、、

本译本审核人员：

王芳内蒙古电力勘测设计院有限责任公司

·1·

徐罡东北电力设计院有限公司

秦学西南电力设计院有限公司

胡振君华北电力设计院有限公司

冯丽敏华东电力设计院有限公司

余帆中南电力设计院有限公司

万承军广东省电力设计研究院有限公司

张杰河南省电力勘测设计院有限公司

专用

人人文库

·2·

NationalEnergyAdministration

Announcement

〔2012〕No.6

IndustrialStandardizationManagement

Accordingtothe

MethodsfortheEnergySectorTrialVersion

（）（GNJKJ〔2009〕

No.52），theNationalEnergyAdministrationhasapproved288

TechnicalRegulations

industrialstandards（seetheAppendix）suchas专用

forEnvironmentalImpactAssessmentofPhotovoltaicPower

Station

，consistingof15energystandards（indicatedbyNB），

104electricpowerstandards（indicatedbyDL），and169

petroleumandnaturalgasstandards（indicatedbySY）.

Appendix：ListofIndustrialStandards

NationalEnergyAdministration

人人文库August23，2012

·1·

Appendix：

Listofindustrialstandards

StandardStandardReplacedReferenceApprovalImplementation

No.

codeNo.namestandardstandarddatedate

…

TechnicalCode

fortheDesignof

DL/TAshHandlingDL/T

1142012-08-232012-12-01

5142-2012Systemof5142-2002

Fossil-fired

PowerPlant

…

专用

人人文库

·2·

Foreword

CodeforDesigningAshHandling

Thiscodeisarevisionof

SystemofPowerPlant

DL/T5142-2002，preparedbyNorthwest

ElectricPowerDesignInstituteofChinaPowerEngineering

ConsultingGroupCorporationinconjunctionwithrelated

NoticeonIssuanceofPlanfor

organizationsasrequiredbythe

DevelopmentandRevisionoftheFirstBatchofEnergyIndustry

Standardsin

2009（GNKJ〔2009〕No.163）issuedbytheNational

EnergyAdministration.专用

Duringtherevision，thedraftingteamhassummedupthe

practicalexperienceinthedesignoffossil-firedpowerplants，

incorporatedtheachievementsinscientificresearch，takeninto

accounttheexperienceinChineseelectricpowerproject

construction，andcollectedthesuggestionsfromrelevantdesign

institutionsanddesignadministrationsacrossthecountry.This

codewasreviewe人人文库d，revisedandfinalizedwithexpertefforts.

Thiscodecomprises14chaptersand4appendixes，maintaining

thebasicframeworkofthe2002version.Therevisionsmademainly

includethefollowing：

1.Basicrequirementsaboutthephysicalandchemical

characteristics，conveyingcharacteristics，storagecharacteristics，

andtestsofashareadded.

2.Relevantrequirementsforthedesignofflyashclassifying

systemareadded.

·1·

3.Relevantrequirementsforthedesignofashhandling

systemandcoalslimepipingconveyingsystemofgarbage

incinerationpowerstationsandstraw-firedpowerplantsare

added.

4.Relevantrequirementsforthedesignofpressurepneumatic

conveyingsystem，mechanicalconveyingsystem，millrejects

transportationsystem，materialstorageandunloadingsystem，high-

concentrationbottomashslurrytransportationsystem，airsupply

andotherauxiliarysystems，andashhandlingsystemofcirculating

fluidizedbed（CFB）areadded.

5.Relevantrequirementsforthedesignofrakeconcentrator

areremoved.

6.Sections＂AshHandlingbyShip专用Transportation＂and

＂WasteBottomAshDischargeofFGDPlants＂areremoved

andtherelevantcontentsareincorporatedintootherchapters.

CodeforDesigningAshHandling

Thiscodewillsupersede

SystemofPowerPlant

DL/T5142-2002uponimplementation.

ThiscodeisadministeredbytheNationalEnergy

Administration，proposedbytheElectricPowerPlanningand

EngineeringInsti人人文库tuteanddailymanagedbythePowerGeneration

DesignStandardizationTechnicalCommitteeoftheenergy

industry.NorthwestElectricPowerDesignInstituteofChina

PowerEngineeringConsultingGroupCorporationisresponsiblefor

theinterpretationofspecifictechnicalissuesherein.Any

commentsandsuggestionsraisedduringtheimplementationof

thiscodearetobereferredtotheElectricPowerPlanningand

EngineeringInstituteatAndeRoad65，XichengDistrict，Beijing，

P.R.China，100120.

·2·

Chiefdevelopmentorganization，participatingdevelopment

organizations，chiefdraftingstaffofthiscode：

Chiefdevelopmentorganization：

NorthwestElectricPowerDesignInstituteofChina

PowerEngineeringConsultingGroupCorporation

Participatingdevelopmentorganizations：

ChinaPowerEngineeringConsultingGroupCorporation

NortheastElectricPowerDesignInstituteofChina

PowerEngineeringConsultingGroupCorporation

NorthChinaPowerEngineeringCo.，Ltd.ofChina

PowerEngineeringConsultingGroupCorporation

SouthwestElectricPowerDesignInstituteofChina

PowerEngineeringConsulting专用GroupCorporation

EastChinaElectricPowerDesignInstituteofChina

PowerEngineeringConsultingGroupCorporation

CentralSouthernChinaElectricPowerDesign

InstituteofChinaPowerEngineeringConsulting

GroupCorporation

Chiefdraftingstaff：

CAI人人文库YuanYUChangyouYUYongzhi

ZHENGHuiminXUHuaZHAOLiqiong

GAOWeiWANGJunYUHua

·3·

Contents

…………………

1GeneralProvisions（1）

…………………

2Terms（5）

…

3PneumaticAshHandlingSystem（6）

…………………

3.1BasicRequirements（6）

…………

3.2PressurePneumaticConveying（7）

…………………

3.3VacuumConveying（13）

………

3.4PneumaticAshConveyingPipes（16）

……………

3.5AirSlide专用（18）

……………

3.6FlyAshClassifyingSystem（20）

…

4HydraulicAshHandlingSystem（22）

…………………

4.1BasicRequirements（22）

………………

4.2WaterSupplySystemforAshHandling（24）

……

4.3HydraulicEjector（27）

……

4.4AshSlurryTrench（28）

…………

4.5SlurryPreparationEquipment（31）

人人文库…………

4.6CentrifugalAshSlurryPump（32）

……

4.7PlungerTypeFlyAshSlurryPump（35）

………………

4.8DewateringBinandClarifyingEquipment（37）

…………

4.9BottomAshSettlementPond（38）

………

4.10HydraulicAshConveyingPipe（40）

…

5MechanicalAshHandlingSystem（44）

…………………

5.1BasicRequirements（44）

……………

5.2Air-cooledSlagConveyor（45）

·1·

…………

5.3SubmergedScrapperConveyor（47）

……………

5.4En-masseScraperConveyor（49）

………………

5.5VerticalBucketElevator（51）

……

5.6BucketConveyor（53）

……

6MillRejectsConveyingSystem（55）

…………………

6.1BasicRequirements（55）

…………

6.2SimpleMechanicalConveying（56）

………

6.3HydraulicJetPumpConveying（56）

…………………

6.4MechanicalConveying（57）

…………………

7AirSupplySystem（59）

…………………

7.1BasicRequirements（59）

7.2AirCompressorandTreatmentFacilitiesof

………

CompressedAir专用（59）

……

7.3RotaryBlowerandVacuumPump（63）

…………

8MaterialStorageandUnloadingSystem（65）

…………………

8.1BasicRequirements（65）

……………

8.2FlyAshSiloandHopper（66）

…

8.3BottomAshSiloandMillRejectsBin（70）

……………

8.4UnloadingSystemandEquipmentSelection（71）

……

9Off-SiteTransportationSystem（73）

人人文库…………………

9.1BasicRequirements（73）

…………………

9.2TruckTransportation（74）

………

9.3BeltConveyor（76）

…………………

9.4ShipTransportation（85）

……………

10AshHandlingSystemforCFBBoiler（91）

…………………

10.1BasicRequirements（91）

………

10.2BottomAshHandlingSystem（92）

…

10.3LimestonePowderHandlingSystem（94）

·2·

11AshHandlingSystemforMunicipleSolidWaste

…………

IncinerationPowerPlant（96）

…………………

11.1BasicRequirements（96）

………

11.2BottomAshHandlingSystem（97）

……………

11.3FlyAshHandlingSystem（99）

……

12AshHandlingSystemforStrawPowerPlant（101）

…………………

12.1BasicRequirements（101）

……

12.2MechanicalAshHandlingSystem（102）

……

12.3PneumaticAshHandlingSystem（102）

………

12.4AshStorage（103）

………………

13SlimePipelinesConveyingSystem（105）

…………………

13.1BasicRequirements（105）

……………

13.2PipingConveyingSystem专用（105）

………………

13.3EquipmentSelections（106）

…………………

13.4SlimePumpHouse（106）

…

14DesignRequirementsforRelevantDisciplines（108）

………………

14.1MechanicalDiscipline（108）

………

14.2I&CandElectricalDiscipline（109）

………………

14.3CivilandHydraulicStructureDisciplines（113）

……………

14.4HydraulicandWaterTreatmentDisciplines（114）

人人文库……

14.5HeatingandVentilationDisciplines（114）

………………

14.6GeneralPlanDiscipline（115）

……………

AppendixACalculationofAshAmount（116）

……

AppendixBCalculationofMillRejectsAmount（120）

………………

AppendixCDensityofSomeMaterials（121）

………

AppendixDCalculationofReynoldsNumber（123）

…

ExplanationofWordinginthisCode（124）

………………

ListofQuotedStandards（125）

·3·

1GeneralProvisions

1.0.1

Thiscodeisdevelopedtoensurethatashhandling

systemsinfossil-firedpowerplantsaredesignedinasafe，reliable，

technicallyadvanced，andeconomicallyviableway.Italsoaimsto

specifyuniformconstructionstandardsandpromoteadvanced

technologies，processes，materialsandequipmentthathavebeen

proveninoperationorindustrialtests.

1.0.2

Thiscodeappliestotheashhandlingdesigninpower

plantswithfuelsolidfossils，garbage，and专用straw.

1.0.3

Theashhandlingdesigninfossil-firedpowerplants

shallcomplywiththerelevantrequirementsofthecurrent

CodeforDesignofFossilFired

nationalstandardsincluding

PowerPlantCodeforDesignofSmallFossil

GB50660and

FiredPowerPlant

GB50049.

1.0.4

Theashhandlingsystemshallbedesignedtoenable

comprehensiveutilizationofash.

1.0.5人人文库

Theashhandlingsystemshallbeplanneddependingon

thescaleofthepowerplantandbebuiltinstageaccordingtothe

scheduleofgeneratorunits.Ifstagedconstructionisunjustifiedby

techno-economiccomparison，one-offconstructionisrecommended.

1.0.6

Theashhandlingsystemmaybepoweredbypneumatic，

mechanical，hydraulicconveyingsystemsoracombinationofthem

andshouldbeinaccordancewiththefollowingrequirements：

1

Forthebottomashdischargedfromdry-bottomfurnace

·1·

boilers，mechanicalbottomashhandlingsystemsshouldbeused；

fortheflyashdischargedfrompulverizedcoalboilers，pneumatic

flyashhandlingsystemshouldbeused；andforthemillrejects

dischargedfrommedium-speedmills，simplemechanicalconveying

systemshouldbeused.Otherconveyingsystemsmayalsobeused

whenconditionsareright.

2

Wheredryashyardisemployed，theconveyingsystems

forash，millrejects，andgypsumoutsidethepowerplantshould

employtrucksfortransportation.

3

Ifwetashyardisemployed，theashconveyingsystem

outsidethepowerplantshouldusehydraulicpipesfortransportation.

1.0.7

Thecapacityofashhandlingsystemoutsidethepower

plantshallbedeterminedbasedonspecif专用icprojectconditions

andtheimplementationofthecomprehensiveutilizationof

ash.

1.0.8

Theashhandlingsystemshallbedesignedbasedon

theamountofashdischargedwhenthedesignfuelisfiredat

theboilermaximumcontinuousrating（BMCR）andchecked

basedontheamountofashdischargedwhenthecheckfuelis

fired，andasuitablemarginshallbereserved.

1.0.9人人文库

Fortheamountofashdischargedfromdifferentparts

ofaboiler，refertoAppendixA.Theflyash-bottomashratio

shallbedeterminedbasedonthedataprovidedbytheboiler

manufacturer.Ifsuchdataisunavailable，thevaluemaybe

selectedfromTableA.0.3inAppendixA.Themillrejects

dischargedbymedium-speedmillsshouldbecalculatedusing

themethodsinAppendixB.

1.0.10

Demonstratedoperatingexperienceofsimilarprojects

·2·

shallbeobtainedforthedesignofthepneumaticconveyingsystem

andstoragefacilities.Wheresuchexperienceisunavailable，

experimentalresearchandtechnicaldemonstrationshallbecarried

outtodeterminethebasiccharacteristicsandconveyingandstorage

characteristicsofmaterials.Ifthedataaboutmaterialdensityis

unavailable，valuesinAppendixCmaybetaken.

1.0.11

Necessaryhoistingandliftingfacilitiesformaintenance

purposeshallbeprovidedatplaceswherecentralizedlayoutofash

handlingequipmentisadopted，andthefollowingrequirements

shallbecompliedwith：

1

Theratedcapacityoftheliftingfacilityshallbedetermined

basedontheheaviestcomponenttobedealtwith，andits

installationheightshallbedetermined专用basedonthelifting

heightofrequiredliftingequipment.

2

Theselectionofliftingfacilitiesshallmeetthefollowing

requirements：

1

）Equipmentandpipefittingsandvalveswhichweigh

onetonoraboveandrequiremaintenanceshallbe

providedwithliftingfacilities.

2

）Equip人人文库mentwhichweighsthreetonsandaboveandis

frequentlyusedshouldbeprovidedwithelectric

liftingfacilities.

3

）Equipmentwhichweighs10tonsandaboveshallbe

providedwithelectricliftingfacilities.

4

）Mobileliftingfacilitiesmaybeprovidedatlocations

whereitisimpracticaltoprovideastationarymaintenance

platform.

5

）Outdoorequipmentmaybeprovidedwithmobileor

·3·

stationaryliftingfacilitiesdependinguponthesurrounding

conditions.

1.0.12

Fortheareaswherecentralizedlayoutisadoptedfor

ashhandlingequipmentandbuildings（structures）oftheash

handlingsystemnecessarycleaningfacilitiesshallbeprovided，

anddustpreventionandsuppressionmeasuresshallbetaken

atloadingandunloadingplaces.

1.0.13

Thewaterandairpipesfortheashhandlingsystem

shallbedesignedastwo-phasepipesinaccordancewiththe

CodeforDesignofSteamWater

currentindustrialstandards/

PipingofFossil-firedPowerPlantCodefor

DL/T5054and

DesignofOilGasPipingofPowerPlant

/DL/T5204.

1.0.14

Theashhandlingsystemandau专用xiliaryfacilitiesshall

bedesignedinaccordancewiththecurrentindustrialstandards

CodefortheDesignofOccupationalSafetyinFossil-fired

PowerPlantCodefortheDesignofOccupational

DL5053，

HealthinFossil-firedPowerPlantCodefor

DL5454，and

DesigningInsulationandPaintingofPowerPlant

DL/T5072.

人人文库

·4·

2Terms

2.0.1

Particledensity

Theratioofmasstotruevolumeforamaterial.

2.0.2

Loose-pouredbulkdensity

Themassperunitvolumeofparticlematerialswhichare

naturallystacked.

2.0.3

Slurryweightdensity

Thepercentageoftheweightofsolidstotheweightof

slurryflowingperunittime.专用

2.0.4

Materialgasratio

Inthepneumaticconveyingpipelines，theratioofthemass

ofconveyedmaterialstothemassofgas.

2.0.5

Percentageofmillrejects

Thepercentageofmillrejectsdischargedfromamedium-

speedmillperunittimetothecoalfedintothemill.

人人文库

·5·

3PneumaticAshHandlingSystem

3.1BasicRequirements

3.1.1

Apressurepneumaticconveyingsystemshouldbeusedto

handleashinthepowerplant.Apositive-pressuredensepneumatic

conveyingsystemshouldbeusedifthematerialcharacteristicsand

conveyingconditionsareproper.

3.1.2

Airslide，vacuum，andotherconveyingmeansmaybe

usedforthepneumaticashconveyingsystemdependingupon

theconveyingdistance.Thefollowingreq专用uirementsshouldbe

compliedwith：

1

Whentheconveyingdistanceislessthan60m，airslide

ashconveyingsystemmaybeused.

2

Whentheconveyingdistanceisnomorethan150m，

thevacuumpneumaticashconveyingsystemmaybeused.

3

Acombinationofmultiplepneumaticconveyingmeans

maybeusedifsuitableforthespecificprojectconditions.

3.1.3人人文库

Ifthebottomashsiloistoofartoarrangemechanical

conveyingequipment，pneumaticbottomashconveyingsystem

maybeused.

3.1.4

Theflowvelocityinthepneumaticashpipesshallbe

properlydeterminedbasedonthefactorssuchasashparticlesize，

ashdensity，pipediameter，andashhandlingandconveyingsystem.

3.1.5

Theeffectsoflocalambientconditionssuchasair

pressure，airtemperature，andhumidityshallbeconsideredin

·6·

thedesignofpneumaticconveyingsystem.

3.1.6

Whenelectrostaticprecipitator（ESP）isusedfor

boilers，theashconveyingsystemofoneelectricfieldandother

subsequentelectricfieldsshallbedesignedtohaveacapacity

abletoaccommodatetheashamountdischargedbythe

precedingelectricfieldstageundernormalconditions.

3.1.7

Ifbottomashconveyingsystemoftheboilerconsists

ofacombinationofair-cooledslagconveyorandpneumatic

conveyingsystem，ahightemperatureresistantbottomashcrusher

shallbeprovidedattheoutletofair-cooledslagconveyorwhose

outputparticlesizeshallmeettherequirementsforconveying.A

bufferbottomashhoppershouldbeprovidedbetweentheoutletof

air-cooledslagconveyorandthepneumaticc专用onveyingequipment.

3.2PressurePneumaticConveying

3.2.1

Thedesignoutputofpressurepneumaticflyash

conveyingsystemshallnotbelessthan150%oftheamountof

flyashdischargedbytheboileroperatingondesigncoalat

BMCRconditions，andshallnotbelessthan120%ofthe

amountofashd人人文库ischargedbytheboileroperatingoncheckcoal

atBMCRconditions.

3.2.2

Eachboilershouldbeprovidedwithtwopressure

pneumaticbottomashconveyingsystems，oneinoperationand

theotheronstandby.Thedesignoutputofeachsystemshould

notbelessthan150%oftheamountofbottomashdischarged

whentheboileroperatesondesigncoalatBMCRconditions，

and120%oftheamountofbottomashdischargedwhenthe

boileroperatesoncheckcoalatBMCRconditions.

·7·

3.2.3

Theblowtanktypepneumaticashtransporter（vessel

transporterinshort）underneaththeprecipitatorashhopperof

shouldbearrangedingroups.Fortheblowtanktypepumps

arrangedbelowthefirstelectricfieldofESPandtheash

hopperofbagfilter，thenumberofthepumpsoperating

simultaneouslyshouldnotexceedsixforeachgroup.

3.2.4

Thenumberofpneumaticashpipesshouldbeproperly

determinedbasedonthesystemoutput，numberofashconveying

equipmentgroups，pipingutilizationrateandcomprehensive

utilizationconditions.Theconveyingcapacityofeachgroupofblow

tanktypepumpsoperatingsimultaneouslyandtheassociatedash

pipeshouldnotexceed80t/h.Theconveyingfrequencyshouldbe

limitedto6times-10timesperhour.专用

3.2.5

Manuallyoperatedisolationvalvesshallbeinstalled

betweentheashhopperandblowtanktypepump.Pneumatic

switchingvalvesshallbeinstalledonthebranchpipesnearthe

mainconveyingpipe.

3.2.6

Duringfeeding，theblowtanktypepumpshouldexhaust

airintotheneareststoragebinssuchastheashhopperof

precipitator，and人人文库theoutletofexhaustpipeshallbeconnected

abovethehighlevelgaugeofstoragebin，suchasashhopper.

Apneumaticexhaustvalveshallbeinstalledontheexhaust

pipe，andtheincludedanglebetweentheexhaustpipeand

horizontalplaneshouldnotbelessthan55°.

3.2.7

Provisionshallbemadeonthepneumaticashpipesto

automaticallypreventcloggingandeliminateanyclogging.The

outletofblockageeliminationpipeshouldbeconnectedabove

thehighlevelgaugeofashhopper.Theoutletsectionof

·8·

blockageeliminationpipeshallbesloped.

3.2.8

Iftheashhoppersofeconomizeranddenitrationfacilities

dischargeashtoadrybottomashsilo，theventfilterofthebin

shallbeprovidedwithanairexhaustblowerandthefilterbag

shallbemadeofhightemperatureresistantmaterials.

3.2.9

Pulsejetcleaningbagfiltershouldbeusedforthevent

filter，andthedustcontentinexhaustairshallcomplywiththe

nationalandlocalenvironmentalprotectionstandards.The

filteringairvelocityofexhaustfiltershouldnotexceed0.8m/min.

Thequalityofpulsejetcleaningairshallmeetthequalityrequirements

forinstrumentalair，whilethepressureandconsumptionrate

shallbedeterminedbasedonthedataprovidedbythemanufacturer.

3.2.10

Theblowtanktypepumpshallbe专用arrangedinaccordance

withthefollowingrequirements：

1

Theincludedanglebetweentheashinletpipeandthe

horizontalplaneshouldbenolessthan60°.

2

Theblowtanktypepumpshouldbearrangedabove

theground，theclearancebetweenitsbottomandtheground

surfaceshallmeetthemaintenancerequirements.

3

Amai人人文库ntenanceplatformshouldbeprovidedatthe

inletvalveofblowtanktypepump.

3.2.11

Thepressurelossofpressureconveyingpipesshall

bethesumofpressurelossofallhorizontal，vertical，inclined

pipesaswellasallpipefittings.Tosimplifythecalculation，

thesepipesandfittingsmaybeconvertedtohorizontalpipes

withequivalentlengths.Whensuspendedflowisconveyed，the

followingformulasmaybeusedforcalculation：

·9·

■■

■γw2L■

P■P2.PλeeeqP■Kμ

Δ=e+196eagD-e（1+）

■2■

（3.2.11-1）

LLHnL

eg=±+∑r（3.2.11-2）

P

Where，—pressurelossofpressureconveyingpipes（Pa）；

P

e—absolutepressureattheterminalofpipesection

calculated.Forthelastpipesectionupstreamthe

P

ashsilo，ereferstothepressureattheconnection

betweenthepipeandthebin；

λ

a—frictionalresistancecoefficientofairatthepipesection

calculated；

L

eq—equivalentlengthofthepipesectioncalculated（m）；

L

—totallengthofhorizontalconv专用eyingpipes（m）；

H

—totallengthofverticalconveyingpipes（m），＂+＂

forriserpipes，and＂-＂forfallingpipes；

n

—numberofpipefittings；

L

r—equivalentlengthofpipefittings.Theequivalent

lengthofbendsmaybeselectedfromTable3.2.11-1；

g2

—gravitationalacceleration，takenas9.8lm/s；

D

—insidediameterofthepipesectioncalculated（m）；

γ人人文库

e—airdensityattheterminalofpipesectioncalculated

3

（kg/m）；

w

e—velocityattheterminalofpipesectioncalculated

（m/s）；

μ

—conveyedmaterialgasratio（kg/kg）；

K

—twophaseflowcoefficient，whichshouldbeobtained

fromtests.Ifnotestdataisavailable，valuesinTable

3.2.11-2maybetaken.

·10·

Table3.2.11-1Equivalentlengthofpipefittings

R

Bends［bendingradius（）/

D

Typeofpipepipediameter（）=3-6］Valve

90°60°45°30°15°

Flyashpipe（m）108642.510-20

Bottomashpipe（m）151296415-30

Table3.2.11-2Twophaseflowcoefficient

Pipediameter

100125150175200＞200

（mm）

Twophaseflow1.00or

K0.300.35-0.450.45-0.550.65-0.750.85-0.95

coefficientabove

3.2.12

Whentheashconveyingsystem专用withairlockvalvesis

used，anairlockvalveshallbeinstalledbelowtheashhopper

ofeachprecipitator.Thefluidizingpadsofairlockvalvesshall

supplycleanair.

3.2.13

Thecapacityofairlockvalvemaybecalculatedusing

thefollowingformulaes：

Forasingleairlockvalve：

Gt

V

=ρKE（3.2.13-1）

人人文库3600h

Formultipleairlockvalves：

Gt.tn

V［+04（-1）］

=ρKEn（3.2.13-2）

3600h

V3

Where，—thecapacityofairlockvalve（m）；

G

—systemoutput（t/h）；

E

—systemefficiencycoefficient（selectedfromTable

3.2.13-1）；

K

—ashbulkdensitycoefficientunderfluidizedcondition

·11·

forflyash，whichmaybetakenas0.75；

n

—numberofairlockvalvessimultaneouslyinoperation；

t

—openingtimeofthelowervalveofairlockvalve，which

maybeselectedfromTable3.2.13-2；

ρ3

h—bulkdensityofash（t/m）.

Table3.2.13-1Systemefficiencycoefficient

n

Numberofairlockvalves（）12Morethantwo

E

Systemefficiencycoefficient0.800.850.90

Table3.2.13-2Openingtimeoffootvalveofairlockvalve

V3

Capacityofairlockvalve（m）0.71.01.42

t

Openingtimeoffootvalveofairlockvalve（s）253040

3.2.14

Iftheashconveyingsystemw专用ithairlockvalvesis

providedwithbranchpipes，thenumberofairlockvalveson

eachbranchpipeshouldnotexceedten.Eachbranchpipeshall

beprovidedwithaswitchingvalveatitsconnectionwiththe

mainpipe.

3.2.15

WhenESPisequippedfortheboiler，theflowdirectionof

branchpipesoftheashconveyingsystemwithairlockvalves

shouldbeperpendiculartothatofthefluegas.

3.2.16人人文库

Intheashconveyingsystemwithairlockvalves，the

airdeliverypipeofeachbranchpipeshallbeprovidedwithone

orificeplate，theorificediameterofwhichshouldbedetermined

basedonthatthepressuredifferencebetweenconveyingpipeand

balancepipeis7kPa.

3.2.17

Iftheashconveyingsystemwithairlockvalvesis

providedwithmorethanonebranchpipes，onespringcheck

valveshallbeinstalledonthehorizontalpipesectionbetween

·12·

theairpipe（downstreamthebalancepipe）andeachbranch

conveyingpipe.

3.2.18

Theinitialconveyingvelocityofpressurepneumatic

ashconveyingsystemshallbedeterminedbasedontheflow

patternofmaterialsinthepipes，andthevelocityatthe

terminalofeachpipesectionshouldnotexceed25m/s.

3.2.19

Theflowofairpneumaticallyconveyedmaybecalculated

accordingto：

G

Q1000

=μρ（3.2.19）

60

Q3

Where，—theflowofairconveyed（m/min，standardconditions）；

G

—outputofpneumaticconveyingsystem（t/h）；

ρ

—densityofairconveyedunder专用standardconditions

3

（kg/m，standardconditions）；

μ

—conveyedmaterialgasratio（kg/kg）.

3.3VacuumConveying

3.3.1

Thedesignoutputofvacuumpneumaticflyashconveying

systemshouldnotbelessthan200%oftheamountofflyash

dischargedbyt人人文库heboileroperatingondesigncoalatBMCR

conditions，andshouldnotbelessthan150%oftheamountof

flyashdischargedbytheboileroperatingoncheckcoalat

BMCRconditions.

3.3.2

Eachboilershouldbeprovidedwithtwovacuum

pneumaticbottomashconveyingsystems，oneinoperationand

theotheronstandby.Thedesignoutputofeachsystemshould

notbelessthan150%oftheamountofbottomashdischarged

whentheboileroperatesondesigncoalatBMCRconditions，

·13·

and120%oftheamountofbottomashdischargedwhenthe

boileroperatesoncheckcoalatBMCRconditions.

3.3.3

Thevacuumpneumaticashconveyingsystemshallbe

equippedwithmanualisolationvalveandashintakevalveat

thebottomofeachashhopper.

3.3.4

Thebranchpipeclosetothemainconveyingpipeshall

beprovidedwithapneumaticswitchingvalve，whilethe

startingendofbranchpipeshallbeprovidedwithanautomatic

airintakevalve.

3.3.5

Theairvacuumpipeinfrontoftheinletofvacuum

exhaustequipmentshallbeprovidedwithavacuumbreaking

valve.

3.3.6

Combined-typeprecipitatormay专用beusedasthedust

collectionequipmentofvacuumpneumaticashconveyingsystem.

Thevelocityoffilteringairofbagfiltershouldnotexceed

0.8m/min，whiletheefficiencyshallnotbelessthan99.9%.

3.3.7

Thebagfiltershallbeprovidedwithautomaticpulse

jetcleaningdevices.Thequalityofpulsejetcleaningairshall

meettherequirementsforinstrumentair，whilethepressure

andconsumptio人人文库nrateshallbedeterminedbasedonthedata

providedbythemanufacturer.

3.3.8

Incalculatingtheoutputofvacuumashconveying

system，theashconveyingoutputofashhoppersnearestand

farthesttotheprecipitatorshallbechecked.Thevacuum

pumpsshallbeconfiguredbasedontheashconveyingoutput

oftheashhopperfarthesttotheprecipitator，whilethebagfilterat

topoftheashsiloshouldbeconfiguredbasedontheashconveying

outputoftheashhoppernearesttotheprecipitator.

·14·

3.3.9

Giventheconveyingdistanceandashconcentration

conditions，therelationshipbetweentheoutputofvacuum

pneumaticashconveyingsystemfittedwithashintakevalve

andthediameterofashconveyingpipemaybeasshownin

Table3.3.9.

Table3.3.9Systemoutputasafunctionofpipediameter

DNDNDNDNDN

Pipediameter（mm）100125150200250

Systemoutput（t/h）58-1010-1520-4040-60

Note：Theupperlimitshallbetakeniftheconveyingdistanceisshort，whilethe

lowerlimitshallbetakeniftheconveyingdistanceislong.

3.3.10

Theminimumvelocityatthestartingendofvacuum

ashconveyingsystemshouldbeintherangeof10m/s-12m/s，

whilethevelocityattheterminalendshould专用notexceed30m/s.

3.3.11

Fortwoormoresetsofvacuumpneumaticashconveying

systems，aswitchingvalvegroupshouldbeinstalledbetweenevery

twoashconveyingpipes.

3.3.12

Theoutputofvacuumpneumaticashconveyingsystem

shouldbecalculatedaccordingto：

QPνPν.

Gbb-ee36

=νmw2w2fN

b-1LfHπg

g+++g

（人人文库）22

（（）3.3.12-1）

.

P08333

ννb

ebP（）

=e3.3.12-2

ww

w（b+）e

=（3.3.12-3）

2

G

Where，—outputofvacuumsystem（t/h）；

Q

—flowofairatthestartingendofvacuumexhaust

3

equipment（m/s）；

·15·

ν3

b—specificvolumeofairatthestartingend（m/kg）；

ν3

e—specificvolumeofairattheterminalend（m/kg）；

P

b—absolutepressureofairatthestartingend（Pa）；

P

e—absolutepressureofairattheterminalend（Pa）；

m

—adiabaticcoefficient，takenas1.2；

w

—averagevelocity（m/s）；

w

b—velocityatthestartingend（m/s）；

w

e—velocityattheterminalend（m/s）；

g2

—gravitationalacceleration，takenas9.81m/s；

L

—geometriclengthofconveyingpipe（m）；

fDf

—frictioncoefficient（for≤200mm，=0.7；for

DfD

≥200mm，=1.1-0.002）；

H

—verticalheight（m）；专用

N

—numberof90°bends；ifbendislessthan90

degree，convertitto90degreebend.

3.4PneumaticAshConveyingPipes

3.4.1

Thestraightsectionsofthepneumaticflyashconveying

pipesshouldbemadeofcarbonsteelmaterials，whilethebendsand

pipefittingssha人人文库llbemadeofwear-resistantmaterials.Forthe

straightsectionsthatconveymediumatahighflowingvelocityand

areseverelyabraded，wear-resistantpipesmaybeemployedif

justifiedthroughtechno-economiccomparison.

3.4.2

Thestraightsections，bends，andfittingsofthepneumatic

bottomashconveyingpipesshallbemadeofwearresistant

materials.

3.4.3

Thewallthicknessofpneumaticflyashconveyingpipes

shouldnotbelessthan7mm.

·16·

3.4.4

Thenumberofbendsshallbeminimizedinthelayout

ofpneumaticashconveyingpipes.Theradiusofcurvaturefor

wearresistantbendsshouldbe3times-6timesthediameter

ofstraightpipesection.

3.4.5

Inthepneumaticashhandlingsystemoverlongconveying

distance，sectionalizedandradius-variabletypeashconveying

pipesshallbeused.Thenumberofsectionsandthelengthof

eachsectionshallbedeterminedthroughcalculation.

3.4.6

Wheretheashhopperoutletorashpipeneedstochange

direction，astraightsectionnoshorterthan10timesthepipe

diametershouldbeprovidedbeforethebend.

3.4.7

Thediameterchangepointonashconveyingpipeshould

notbelessthan6mawayfromthebend.专用

3.4.8

Thepneumaticashconveyingpipesshouldbearranged

overhead.Iftheyarearrangedonthegroundsurface，crossing

footpathsshallbeprovidedatthedesignatedplacesforpersonnel

access.Whenthepneumaticashpipesarearrangedoverhead，

thedistancesfromtherailways，highways，buildings，andhigh

voltagelinesshallcomplywiththerequirementsinthecurrent

CodeforDesignofGeneralLayoutand

industrialstandards

Transportationfo人人文库rPowerPlantOperatingCode

DL/T5032and

forOverheadTransmissionLine

DL/T741.

3.4.9

Whenthestraightsectionofpneumaticashconveying

pipeistoolongtomeettherequirementsonself-compensation

forexpansionandcontraction，compensatorsshouldbeinstalled.

Theinstallationlengthofcompensatorsandtheinstallation

clearanceofquickjoiningpipingjointsshallbecalculated

basedonthetemperaturedifferencebetweenthedryashinthe

·17·

pipe（orthelowestlocalambienttemperature）andtheambient

temperatureatthetimeofinstallation.

3.4.10

Thesupportsofpneumaticashconveyingpipesshall

bedesignedinaccordancewiththefollowingrequirements：

1

Thespacingofsupportsandhangersshallmeetthe

requirementsintermsofstrengthandstiffness.

2

Ifself-compensationisemployed，afixedsupportshall

beprovidedatornearthemidpointofeachstraightsection，

andslidingsupportsshallbeprovidedatpipeturnings.

3

Ifcompensatorsareused，afixedsupportshallbe

providedatornearthemidpointofstraightsectionbetween

twocompensators，andguidingsupportsorslidingsupports

shallbeprovidedatotherplaces.Onefi专用xedsupportshallbe

providedbetweenacompensatorandabend，andthesupports

nearthebendsshouldbeslidingsupports.

4

Whenquickjoiningpipingjointsareusedforcompensation

purpose，eachpipesectionshallbeprovidedwithatleastone

supportwhosefixinglocationshallbedeterminedbasedonthe

pipelinearrangement.

3.5AirSlide

人人文库

3.5.1

Theconveyingcapacityofairslidemaybecalculated

accordingto：

GKbhwρ'

=3600xxx（3.5.1-1）

ρ'.ρ

x=075h（3.5.1-2）

G

Where，—conveyingcapacity（systemoutput）ofairslide（t/h）；

b

—widthofairslide（m）；

h

—thicknessofashlayer，takenas0.10m-0.15m；

·18·

K

x—coefficient，takenas0.9；

w

x—conveyingspeedofashintheairslide（m/s）；

ρ3

h—bulkdensityofash（t/m）；

ρ'3

x—densityofashinfluidizationstate（t/m）.

3.5.2

Theconveyingspeedofashintheairslidemaybe

calculatedaccordingto：

w.R2/3i1/2

x=385n（3.5.2-1）

bh

R

n=hb（3.5.2-2）

2+

i

Where，—slopeofairslide（%）；

R

n—hydraulicradius.

3.5.3

Thearrangementofairslidesshallcomplywiththe

followingrequirements：专用

1

Theslopeshouldnotbelessthan6%.

2

Damp-proofandthermalinsulationmeasuresshould

beconsidered.

3

Isolationvalveformaintenancepurposeandelectric

rotaryfeedershallbeinstalledbetweenashhopperandair

slide.

4

Flexible人人文库couplingshouldbeadoptedbetweenashdischarge

pipeandairslideandbetweenblowerandairnozzle.

3.5.4

Theunitairconsumptionortotalairpressureofairslide

shallbedeterminedthroughtests.Ifnotestdataisavailable，theunit

32

airconsumptionmaybetakenintherangeof1.5m/（min·m）-

32

2.5m/（min·m）understandardconditions（airpermeable

layer），andthetotalairpressuremaybetakenintherangeof

3kPa-5kPa.

3.5.5

Cleanhotairshallbeusedastheconveyingairsource

·19·

ofairslide，andthetemperatureofhotairshouldbeinthe

rangeof40℃-80℃.Airshouldbesuppliedbyspecialblower

withnostandby，andmaybesuppliedbytheforceddraft

blowerofboilerifconditionspermit.

3.5.6

Oneairintakeshallbesetatthestartofairslide，and

oneairintakeandoneairchamberpartitionplateshouldbe

providedatanintervalof30mandatturningpoints.

3.5.7

Theexhaustairofairslideshouldbeconnectedtothe

inletflueofboilerflueprecipitatorwhileacut-offvalveshall

beprovidedbetweenthem.Theairexhaustpipeshallbe

arrangedwithaslopetoavoidashaccumulation.

3.6FlyAshClassifyingSystem

专用

3.6.1

Whenthemarketdemandforashcomprehensiveutilization

islargeandclassifiedashisrequired，flyashclassifyingsystem

shouldbeprovidedsimultaneously.

3.6.2

Closedcycletypedryashclassifyingsystemsshouldbe

used，thenumberofsetsandoutputofwhichshallbedetermined

basedontheashcomprehensiveutilizationdemand.

3.6.3

Volute人人文库orturbineairflowclassifiermaybeusedfor

dryashclassifyingsystem.Theefficiencyofclassifiershould

notbelowerthan80%，whileitsdustcollectionefficiency

shouldnotbelowerthan90%.

3.6.4

Ifdryashisclassifiedinacentralizedway，theassociated

ashsilosshouldbecombinedwiththestorageashsiloof

conveyingsystem.Thenumberofashsilosshallbedetermined

basedontheclassificationrequirementsofashtoberecycled

andshouldnotbelessthanthree.Thestoragecapacityofash

·20·

siloshallaccommodatetheashcomprehensiveutilization

requirement.

3.6.5

Specialwearresistantcentrifugalblowersshallbeusedfor

thedryashclassifyingsystemandtheflowpassagecomponentsof

classifier，cyclonecollector，andhigh-pressurecentrifugalblower

shallbemadeofwearresistantmaterials.

3.6.6

Theconveyingspeedinthepipesofthedryashclassifying

systemshouldbeintherangeof15m/s-20m/s.Thestraight

sectionsofashconveyingpipesmaybemadeofcarbonsteel

materialsandthebendsshallbemadeofwear-resistant

materials.Thewallthicknessshouldnotbelessthan8mmfor

theashconveyingpipesandshouldnotbelessthan6mmfor

thereturnairpipes.专用

人人文库

·21·

4HydraulicAshHandlingSystem

4.1BasicRequirements

4.1.1

Thefollowingmethodsmaybeusedforthehydraulic

bottomashhandlingsystem：

1

Thebottomashdischargedfromtheboileriscooled

bythewater-sealedbottomashhopperandtheresulting

slurryisregularlyconveyedthroughthehydraulicejectors

andconveyingpipestothedewateringbinorashslurry

sump.专用

2

Thebottomashdischargedfromtheboileriscooled

bythewater-submergedscraperconveyorandtheresulting

slurryisconveyedthroughthebottomashslurrypumpsand

conveyingpipestothedewateringbin，ashslurrysumporash

yard.

3

Thebottomashdischargedfromtheboileriscooled

bythewater-su人人文库bmergedscraperconveyor，andtheresulting

slurrygravityflowsthroughthebottomashslurrytrenchto

theslurrysettlementpond.

4.1.2

Thefollowingmethodsmaybeusedforthehydraulic

flyashhandlingsystem：

1

Thedryashfromtheflyashsiloismadeintoslurry

bytheslurrypreparationequipmentandtheresultingash

slurryishydraulicallyconveyedthroughthecentrifugalor

plungertypeflyashslurrypumpsandconveyingpipestothe

·22·

ashyard.

2

AfterthedryashfromashhoppersofESPsismade

intoslurry，theashslurryishydraulicallyconveyedthroughfly

ashslurrytrench，centrifugalslurrypumpandconveyingpipes

totheashyard.

4.1.3

Theeffectivecapacityofwater-sealedbottomashhopper

shallnotbelessthanthebottomashdischargeofboilerforeight

hourswhenoperatingondesigncoalat100%BMCR，andshall

notbelessthanthebottomashdischargeofboilerforfour

hourswhenoperatingoncheckcoal.

4.1.4

IftheashhoppersoffluegasESPsandeconomizers

aresettoremoveashperiodically，theintervalbetweentwo

cyclesshouldnotbelessthantwohours专用.

4.1.5

Industrialwastewatertreateduptothestandardshould

beusedforashhandling，whilethedrainagewaterandwastewater

fromotherprocesssystemsaswellastherainwaterintheboiler

areashallnotflowintotheashhandlingsystemdirectlyunless

treateduptothestandard.

4.1.6

Ashslurryvalvesshallbeinstalledattheoutletpipe

ofashslurrypu人人文库mpbasedonthepipelinelayoutandswitching

requirementsofthehydraulicashhandlingsystem.Whenthe

elevationofashyardisgreatlyhigherthanthatofthepump

outlet，slow-closingcheckvalveshouldbeprovidedatthe

outletpipe.

4.1.7

Theflowvelocityinthepipesofhydraulicashhandling

systemshallcomplywiththerequirementsinTable4.1.7.

·23·

Table4.1.7Flowvelocityofvariousmediumsinthepipes

Flowvelocity

MediumPipe

（m/s）

Centrifugalwaterpumpsuctionpipe0.5-1.5

Centrifugalpumpdischargepipeand

Clearwater2.0-3.0

otherpressurizedwaterpipes

Unpressurizeddrainpipes＜1.0

Flyashslurry≥1.0

Ashslurry≥1.6

Pumpoutletpipe

Bottomashslurry≥1.8

Liquidbottomashslurry≥2.2

4.1.8

Protectivehandrailsorcoverplatesshallbeprovidedfor

theashslurrysump，bottomashsettlementpond，concentrator，

dewateringbin，settlingtank，andwatertan专用katplaceswherethe

personnelareexposedtohigh-elevationdangerorfalldanger.

4.2WaterSupplySystemforAshHandling

4.2.1

Thewatersupplyfortheashhandlingsystemshall

satisfytherequirementsfortheashhandlingwater.Aclosed

cyclesystemshouldbeused.

4.2.2

Thewaterrequiredforwatersealingandquenching

purposeofthe人人文库boilerbottomashdischargingdevicesshallbe

suppliedcontinuously，thepressureatthenozzleinletshallbe

0.1MPa-0.15MPa，andthedataonthewaterflowand

qualityshallbeprovidedbythemanufacturer.Ifnosuchdata

isavailable，thewaterflowmaybecalculatedaccordingto：

GA

G189z+13

s=tt（4.2.2）

s2-s1

G3

Where，s—waterrequiredforwatersealingandquenching（m/h）；

G

z—bottomashdischargeofboilerperhour（t/h）；

·24·

A

—areaofthebottomashdischargeportofboiler

2

furnace（m）；

t

s1—inlettemperatureofcoolingwater（℃）；

t

s2—overflowtemperatureofcoolingwater（℃），which

maybetakenas60℃.

4.2.3

Ifthebottomashdischargeequipmentofboilerisset

todischargebottomashperiodically，thepressureofbottom

ashsluicingwatershouldnotbelessthan0.8MPa.The

consumptionofbottomashsluicingwatermaybedetermined

basedonthedataprovidedbythemanufacturer，orcalculated

usingthefollowingformulabasedonthenozzlediameterand

thenumberofnozzlesrovidedbthemanufacturer：

py.

G.3φd2P05

j=398×10j专用（4.2.3）

G3

Where，j—waterconsumptionofjetnozzle（m/h）；

d

—nozzlediameter（m）；

P

—sluicingwaterpressureatnozzleinlet（kPa）；

φ

j—flowcoefficient，whichmaybeselectedfromTable

4.2.3.

Table4.2.3Parameterφjasafunctionofnozzlediameter

Nozzlediamet人人文库er（mm）810-161820-22

φ

j0.700.750.800.85

4.2.4

Low-temperaturewatershouldbeusedasgranulating

waterforliquidbottomashdischargechuteandshallbe

suppliedcontinuously.Thewaterpressureshallbedetermined

basedonthedataprovidedbythemanufacturer.Ifnosuch

dataisavailable，thegranulatingwaterpressureattheinletof

thegranulatingwatertankshallnotbelessthan0.2MPa.

Theoverflowtemperatureofthegranulatingwatertank

·25·

shouldnotbehigherthan60℃.

4.2.5

Theunitconsumptionofgranulatingwatermaybe

calculatedaccordingto：

Ctt

Glz（z1-z2）+251

z=Ctt（4.2.5-1）

s（2-1）

C..-3tt

z=0712+0251×10（z1+z2）（4.2.5-2）

Gl3

Where，z—unitconsumptionofgranulatingwater（m/t）；

C