Digesters - Metropolitan Water Reclamation District of Greater Chicago

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Recommended Utilization SystemSteam Turbine Alternate A –Uses extraction steam for buildingand digester heatingSWRP Specific Advantages• Takes advantage of required boiler replacement• Utilizes the existing skills of plant personnel• Maintains consistency in plant heating scheme andheating infrastructure
Conclusions/Discussion• A Combined Heat and Power option provides the greatesteconomic advantage of all options, so long as the CHP is priorityloaded with biogas.• Reciprocating Engines have highest electrical efficiency, andtherefore offer greatest GHG reduction but requires greater gascleaning, capital outlay, and maintenance.• Engines are more sensitive (volatile) to changes in electricalprices than steam turbines.• Therefore, economic returns for Steam Turbines are greater thanEngines for this plant.• Slight changes in electricity rates have a significant affect on theeconomic payback of all co-generation alternatives.51
Page 1 and 2: Digester Gas Utilization at SWRPWhe
Page 3: Presentation Outline• Background/
Page 9 and 10: Projected Digester PerformanceVSR
Page 12 and 13: Digester Gas Production - Modeling
Page 15 and 16: Energy Consumption at SWRP• Build
Page 24 and 25: Energy Flow Scenarios:Digester Gas?
Page 26 and 27: Energy Flow Modeling Framework26
Page 28 and 29: Model Components - Gas Cleanings H2
Page 30 and 31: Model Components - Plant Energy Dem
Page 32 and 33: Projecting Future Energy Prices•
Page 34 and 35: Energy Flow Model - ScenariosScenar
Page 36 and 37: Energy Flow Model - Results$2,000,0
Page 38 and 39: Engine Operation Alternatives• Ba
Page 40 and 41: Updated Model Parameters• New Per
Page 42: Sensitivity Analysis - Electricity
Page 45 and 46: Triple Bottom Line Analysis• Econ
Page 47 and 48: Other Reference InstallationsMetrop
Page 49: Calls and Field Visits - Steam Turb
Page 53 and 54: Sizing of Cogeneration SystemsCogen
Page 55 and 56: Triple Bottom Line ScoringScenario

Digesters - Metropolitan Water Reclamation District of Greater Chicago

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