46740 lagoon digester 01a
TRANSCRIPT
Microturbine OperationMicroturbine Operation
with with BiogasBiogas from a from a
Covered Dairy ManureCovered Dairy Manure
LagoonLagoon
Douglas W. WilliamsDouglas W. WilliamsBioResource and Agricultural EngineeringBioResource and Agricultural EngineeringCalifornia Polytechnic State UniversityCalifornia Polytechnic State University
San Luis Obispo, CA USASan Luis Obispo, CA USA
J.J. FrederickJ.J. FrederickStudent AssistantStudent Assistant
California Polytechnic State UniversityCalifornia Polytechnic State UniversitySan Luis Obispo, CA USASan Luis Obispo, CA USA
AcknowledgementsAcknowledgements WRBEP WRBEP (Western Regional Biomass Energy Program)(Western Regional Biomass Energy Program)
CSU-ARICSU-ARI (CA State Univ.Agricultural Research Institute)(CA State Univ.Agricultural Research Institute)
Southern California Gas CompanySouthern California Gas Company
California Polytechnic State UniversityCalifornia Polytechnic State University
Capstone MicroturbinesCapstone Microturbines
USDA-NRCSUSDA-NRCS
(Natural Resource Conservation Service)(Natural Resource Conservation Service)
Methane Production Methane Production TechnologiesTechnologies
Covered LagoonCovered Lagoon 78% Success Rate 78% Success Rate
Plug FlowPlug Flow 37% Success Rate 37% Success Rate
Complete MixComplete Mix 30% Success 30% Success RateRate
Covered Lagoon Digester at Covered Lagoon Digester at 9000-head Swine Farm 9000-head Swine Farm
Lagoon Digester and Biogas Lagoon Digester and Biogas HandlingHandling
Successful Biogas-fueled 60 KW Successful Biogas-fueled 60 KW Engine-GeneratorEngine-Generator
FARM DESCRIPTIONFARM DESCRIPTION Free Stall DairyFree Stall Dairy
~ 300 Cows, Heifers, Calves~ 300 Cows, Heifers, CalvesEquivalent /250 AU’s (Animal Units)Equivalent /250 AU’s (Animal Units)
Flushed Dairy Manure RemovalFlushed Dairy Manure Removal250 to 400 cubic meters/day250 to 400 cubic meters/day.3 to .4 % Total Solids.3 to .4 % Total Solids
3000 to 4000 mg/l COD3000 to 4000 mg/l COD
Electrical UsageElectrical Usage234,000 KWhrs/year234,000 KWhrs/year$21,000 per year$21,000 per year
Cal Poly Dairy Parlor and Cow Cal Poly Dairy Parlor and Cow LaneLane
Figure 1. Covered Lagoon Figure 1. Covered Lagoon SchematicSchematic
Sump and pump
Irrigation pump
Recycle flush water pump
Slurry Inlet
MilkingParlor
SolidsSeparator
ManureSolids
30 kW Micro-Turbine electric GeneratorSystem
Below-ground Biogas Line
Overflow to storage
Existing Storage Lagoon, 19,000 cubic meters capacity
New Covered Lagoon, 14,000 cubic meters liquid capacity
FLUSHED MANURE WASH ALLEY
Sump and
Transfer Pump
Measuring Influent Flow into Measuring Influent Flow into LagoonLagoon
Lagoon CoverLagoon Cover
Lagoon Covers and Biogas Pipe Lagoon Covers and Biogas Pipe ConnectorConnector
Lagoon Cover and Biogas PipeLagoon Cover and Biogas Pipe
Biogas Pipe InstallationBiogas Pipe Installation
Biogas pipe with Condensate Biogas pipe with Condensate TrapTrap
Biogas Piping Condensate Biogas Piping Condensate Removal BoxRemoval Box
Biogas Handling SystemBiogas Handling System
Biogas Equipment and Lagoon Biogas Equipment and Lagoon CoverCover
Compressor, Microturbine and Compressor, Microturbine and Heat ExchangerHeat Exchanger
TABLE 1TABLE 1
MAJOR EQUIPMENT ITEMSMAJOR EQUIPMENT ITEMS Digester Cover and InstallationDigester Cover and Installation 90,000 90,000
Gas HandlingGas Handling 5,000 5,000
Micro-Turbine Compressor, Heat ExchangeMicro-Turbine Compressor, Heat Exchange 50,000 50,000
Electric Generator Building and UtilityElectric Generator Building and Utility 5,000 5,000
Utility Tie-inUtility Tie-in 5,000 5,000
Equipment SubtotalEquipment Subtotal 155,000155,000
CONSTRUCTIONCONSTRUCTIONEngineeringEngineering 25,000 25,000
Construction SubtotalConstruction Subtotal 25,00025,000
TOTAL $TOTAL $180,000180,000
PROJECT STATUS
Cover Installed90% of area covered
Biogas Production200 to 300 cu meters/day
88% Methane, 12% CO2 Biogas tested in 10 KW Engine-
Generator Set 75% COD Reduction
Microturbine and Covered Microturbine and Covered LagoonLagoon
10 KW Engine-Gen Set10 KW Engine-Gen Set
Biogas Measurement by Cal Poly Biogas Measurement by Cal Poly StudentsStudents
10 KW Engine-Generator Test on 10 KW Engine-Generator Test on BiogasBiogas
Engine Generator at Full 10 KWEngine Generator at Full 10 KW
Covered Lagoon Effluent PipeCovered Lagoon Effluent Pipe
CONCLUSIONS 10 KW Engine-Generator Test
Input: 11 cubic meters/hrOutput: 10 KW Efficiency:10%
30 KW Microturbine Specification:Input: 13 cubic meters/hrOutput: 28 KWEfficiency: 27%
Effluent Characteristics:1000 to 1500 mg/l COD90 mg/l Ammonia
BENEFITS OF ANAEROBIC DIGESTION
Odor control
Effective Manure and NutrientManagement
Electrical Returns 170,000 KWhrs/year
$15,500/year75% of Demand