Aisin AW Co., Ltd. - ECCJ

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National Convention of Excellent Examples in Energy Conservation for Fiscal 20042004_PCECCJ_12_Aisin_AW_Co.,_Ltd.(2) Investigation to Improve the Efficiency of the Cogeneration SystemImprovement ofSteam CollectionInvestigation of Most AppropriateOperation PatternVariableExtractionPressure(Case Study 1)Introduction ofSteam TurbinesUtilization ofIT (CaseStudy 3)Improvement of PowerGeneration EfficiencyImprovement ofCompressorsImprovement ofBurners. ReplacingHeat Sources ofAir Conditioningwith SteamImprovement onthe User SideRecovery ofCondensingHeat (CaseStudy 2)Using SteamHeaters (CaseStudy 4)Improvement of Heat Efficiency(Utilization of Exhaust Heat)Higher Combustion TemperatureSuction airCoolingHeatingSupply WaterDrainCollectionImprovement ofRadiation Loss・・・Adopted in This Case StudyImprovement ofCogenerationSystemEfficiencyDrain CollectionImprovement ofHeat Exchanger4. Details of Measures(1) Case Study 1 (New Technology 1): Control of optimum load of electricgenerators and chiller by introducing variable extraction pressure ofthe steam turbines (patent application)The pressure of the exhaust steam was 1.8 MPa, whereas the pressure required on the userside facility (steam driven chiller and production facility) was 0.6 MPa - 0.8 MPa. Toeffectively use this pressure difference, extraction condensing steam turbine electricgenerators were introduced. In addition, for further improvement of efficiency, we focused onfluctuation of the pressure required by the steam absorption type chiller and control theextraction pressure according to the load so that the maximum electricity is alwaysgenerated.6
National Convention of Excellent Examples in Energy Conservation for Fiscal 20042004_PCECCJ_12_Aisin_AW_Co.,_Ltd.Exhaust SteamIncrease by 164 kWExtractionCondensing SteamTurbine GeneratorGenerated Electricity Output: Normally 805 kW => 969Extraction Pressure ControlValveElectricityExtraction Steam:Normally 0.8 MPa =>Variable Range of 0.6 -0.8 MPaFlow Rate Control ValveCollected DrainChilledWater for AirConditioningCoolingTowerSteam Absorption type Chiller(Replaced from Gas to Steam)Steam forManufacturing (HeatSource for CleansingMachine)The pressure of the extracted steam of the absorption type chiller was controlled high usingthe extraction pressure control valve when the cooling load is high and when the load is lowor the temperature of the cooling water is low, it was controlled low so that the generatedelectricity is the maximum. (Fig.7)As shown in Fig. 8, for example, when the chiller load is 80%, extraction pressure wastraditionally 0.8 MPa, but it was lowered to 0.6 MPa, and we succeeded to increase theoutput electricity of steam turbines by 164 kW.Example: When the Chiller Load is 80%ElectricityOutputGeneratedby SteamTurbineImprovedControlTraditionalControlExtraction PressureEffect of Introduction 1 (Gas Turbine + Steam Turbine + Variable Extraction Pressure)Reduction of Energy Cost: 190 Million Yen/Year, Reduction of CO 2 emission: 3,600 ton/Year7
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Aisin AW Co., Ltd. - ECCJ

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