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1、英文原文文献AutomaticControloftheLevelofBoilerBubbleWANGZhi(LuoyangPetrochemicalEngineeringCo.,Luoyang471003,China)Abstract:Thepaperintroducedthedynamiccharacteristicsofthelevelofboilerbubble.Thecharacteristicsofautomaticcontrolschemeswithonevariableortwovariab
2、lesorthreevariableswerediscussed,aswellassomeproblemsconcernedinengi-neering.Theautomaticcontrolschemeofboilerbubblewiththreevariableswasrecommendedspecially.Keywords:thelevelofboilerbubble;dynamiccharacteristics;automaticcontrolschemes;onevariable;twovar
3、iables;threevariables.INTRODUCTIONBoilerdrumwaterlevelisthemajorindicators,isaveryheavytotheaccusedvariablestomaintainthewaterlevelinacertainrangeistoensurethattheboilerThefirstconditionfortheentireoperation,itisbecause:(1)highwaterlevelwillbeaffectsteamP
4、ackageseparator,saturatedwithwateropourtoomuchwater,superheatedsteamtemperatureInsharpdecline.Thesuperheatedsteamturbineasadrivingforce,itwouldTurbineBladedamaged,affectingthesafetyandeconomy.(2)waterbittoolow,thelesswaterinthedrum,andwhentheloadishigher,
5、asthewaterVaporizationofspeed,drumchangesinthewaterlevelhasalsoaddedspeed.Fast,ifnotpromptlyadjust,itwillcausethedrumallvaporizationofthewater,resultinginBurningfurnacetube,orevencauseanexplosion.Therefore,theboilerdrumwaterlevelmustbestrictCanadiancontro
6、l.2SeveralBoilerwaterlevelcontrolprogram.2.1-ImpulseControlSystem Impulse-controlsystem(thetermreferstotheimpulseisvariable,namelysingleimpulseDrumLevel)areindirectcontrolofdrumwaterlevelcontrolvalve(Figure4below),thedrumisthemostsimplelevelcontrolofthem
7、ostbasicAformisatypicalvalueforsingle-loopcontrolsystem.ThesystemguitarSimpleconfigurationto-10-achievelowinvestmentandeasyforsmalllow-pressureboiler.Boilersteambecausethisloadisrelativelystable,andtherelativevolumeDrumTherequirementsofusersofsteamoftenno
8、tverystrict,ifthecontrolsystemsomealarminterlockdevices,butalsotomeetproductionrequirements.Figure4singleimpulsecontrolsystemblockdiagramstayinarelativelyshorttime,largeloadchanges,wecannotsingle. Figure4singleim
