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1、英文原文文献AutomaticControloftheLevelofBoilerBubbleWANGZhi(LuoyangPetrochemicalEngineeringCo.,Luoyang471003,China)Abstract:Thepaperintroducedthedynamiccharacteristicsofthelevelofboilerbubble.Thecharacteristicsofautomaticcontrolschemeswithonevariableortwovariablesort
2、hreevariableswerediscussed,aswellassomeproblemsconcernedinengi-neering.Theautomaticcontrolschemeofboilerbubblewiththreevariableswasrecommendedspecially.Keywords:thelevelofboilerbubble;dynamiccharacteristics;automaticcontrolschemes;onevariable;twovariables;three
3、variables.INTRODUCTIONBoilerdrumwaterlevelisthemajorindicators,isaveryheavytotheaccusedvariablestomaintainthewaterlevelinacertainrangeistoensurethattheboilerThefirstconditionfortheentireoperation,itisbecause:(1)highwaterlevelwillbeaffectsteamPackageseparator,sa
4、turatedwithwateropourtoomuchwater,superheatedsteamtemperatureInsharpdecline.Thesuperheatedsteamturbineasadrivingforce,itwouldTurbineBladedamaged,affectingthesafetyandeconomy.(2)waterbittoolow,thelesswaterinthedrum,andwhentheloadishigher,asthewaterVaporizationof
5、speed,drumchangesinthewaterlevelhasalsoaddedspeed.Fast,ifnotpromptlyadjust,itwillcausethedrumallvaporizationofthewater,resultinginBurningfurnacetube,orevencauseanexplosion.Therefore,theboilerdrumwaterlevelmustbestrictCanadiancontrol.2SeveralBoilerwaterlevelcont
6、rolprogram.2.1-ImpulseControlSystem Impulse-controlsystem(thetermreferstotheimpulseisvariable,namelysingleimpulseDrumLevel)areindirectcontrolofdrumwaterlevelcontrolvalve(Figure4below),thedrumisthemostsimplelevelcontrolofthemostbasicAformisatypicalvalueforsingl
7、e-loopcontrolsystem.ThesystemguitarSimpleconfigurationto-10-achievelowinvestmentandeasyforsmalllow-pressureboiler.Boilersteambecausethisloadisrelativelystable,andtherelativevolumeDrumTherequirementsofusersofsteamoftennotverystrict,ifthecontrolsystemsomealarmint
8、erlockdevices,butalsotomeetproductionrequirements.Figure4singleimpulsecontrolsystemblockdiagramstayinarelativelyshorttime,largeloadchanges,wecannotsingle. Figure4singleim
