壓縮機(jī)調(diào)節(jié)功能知識

RegulatingSystem3mainprinciplesLoad/NoLoad(standard)ModulatingControl(optional)VariableSpeedDrive(VSD)GAinLoadconditionIndustrialAirDivisionGAinNoLoadconditionIndustrialAirDivisionPowerconsumption:

Load-NoLoadPowerCapacityPowerCapacityLoadNoLoad100%75%50%25%0%Load/NoLoadprinciple

(standardregulatingsystem)

8,5barCapacityPowerconsumptionAirpressureLegend:P=100%P=0%P=20%V=100%V=0%8barLoad/NoLoad/Stop02468101214161820Time(min)Workingcondition(L-NL-S)pressure(bar)7bar6barLoadNoLoadStopIndustrialAirDivisionTheCapacityControlsystemCompressedairsupplyis“matched”tothedemandbythrottlingtheairinletvalve.

(Theincreasedpressuredropreducestheairdelivery)ThepowerconsumptionremainsneartomaximumIndustrialAirDivisionPowerconsumption:

ModulationPowerCapacityPowerCapacityFullLoad50%Modulation100%75%50%25%0%CapacityControlP=100%P=80%P=20%V=25-50%V=0%V=100%8,2bar7,8barCapacityPowerconsumptionAirpressureLegend:TheVariableSpeedDriveCompressorThisconceptisbyfarsuperiortoModulatingcontrolledcompressors.BecausethepowerconsumptionisreducedaccordinglytothecompressedairdemandPowerconsumption:

VariableSpeedDrivePowerCapacityPowerCapacity100%75%50%25%0%100%capacity50%capacityP=20%P=100%P=0%8,1bar8barV=15%V=100%V=0%CapacityAirpressureLegend:PowerconsumptionVariableSpeedDrive(VSD)VSD-system:controlprincipleOncetheVSDisstarted,thepressuresensorreadoutiscontinuouslycomparedwiththeprogrammed‘SETPOINT’pressure(Pload

andPunload

don’texistanymore)Ifthenetpressureishigher,thespeeddecreasesIfthenetpressureislower,thespeedincreasesTheimplementedcontrolalgorithmisaProportionalandIntegratingcontroller(PI)TheusablecompressorspeedislimitedbyaMaximumandMinimumspeedIndustrialAirDivisionVSDclosedloopregulationFrequencyconverterDrivemotorCOM1-ModuleCompressorscrewelementThesystemtargetsaconstantdeliverypressure(setpoint)F