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46740 Lagoon Digester 01a

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46740 Lagoon Digester 01a Powered By Docstoc
					Microturbine Operation
   with Biogas from a
Covered Dairy Manure
        Lagoon
      Douglas W. Williams
BioResource and Agricultural Engineering
California Polytechnic State University
      San Luis Obispo, CA USA

           J.J. Frederick
           Student Assistant
California Polytechnic State University
      San Luis Obispo, CA USA
         Acknowledgements
 WRBEP
    (Western Regional Biomass Energy Program)
 CSU-ARI
    (CA State Univ.Agricultural Research Institute)
 Southern California Gas Company

 California Polytechnic State University

 Capstone Microturbines

 USDA-NRCS
    (Natural Resource Conservation Service)
      Methane Production
         Technologies

 Covered Lagoon   78% Success Rate


 Plug Flow        37% Success Rate


 Complete Mix     30% Success Rate
Covered Lagoon Digester at
  9000-head Swine Farm
Lagoon Digester and Biogas
        Handling
Successful Biogas-fueled 60 KW
       Engine-Generator
    FARM DESCRIPTION
   Free Stall Dairy
        ~ 300 Cows, Heifers, Calves
        Equivalent /250 AU’s (Animal Units)

   Flushed Dairy Manure Removal
        250 to 400 cubic meters/day
        .3 to .4 % Total Solids
        3000 to 4000 mg/l COD

   Electrical Usage
        234,000 KWhrs/year
        $21,000 per year
Cal Poly Dairy Parlor and Cow
            Lane
                    Figure 1. Covered Lagoon
                                             Milking
                            Schematic        Parlor
           FLUSHED MANURE WASH ALLEY
                  Irrigation   Recycle
                  pump         flush     Overflow
  Sump and                     water     to storage        Below-ground
  pump                         pump                        Biogas Line



                         Existing                       New Covered           30 kW Micro-
   Solids                                                                     Turbine
   Separator             Storage                        Lagoon, 14,000        electric
                         Lagoon, 19,000 cubic           cubic meters liquid   Generator
                         meters capacity                capacity
                                                                              System


  Manure
  Solids


       Transfer
       Pump                                           Slurry Inlet



Sump and
Measuring Influent Flow into
         Lagoon
Lagoon Cover
Lagoon Covers and Biogas Pipe
         Connector
Lagoon Cover and Biogas Pipe
Biogas Pipe Installation
Biogas pipe with Condensate
            Trap
Biogas Piping Condensate
     Removal Box
Biogas Handling System
Biogas Equipment and Lagoon
           Cover
Compressor, Microturbine and
     Heat Exchanger
                     TABLE 1
MAJOR EQUIPMENT ITEMS
Digester Cover and Installation               90,000
Gas Handling                                    5,000
Micro-Turbine Compressor, Heat Exchange       50,000
Electric Generator Building and Utility        5,000
Utility Tie-in                                 5,000
                    Equipment Subtotal      155,000
CONSTRUCTION
Engineering                                  25,000
                    Construction Subtotal   25,000

                            TOTAL         $180,000
     PROJECT STATUS

   Cover Installed
        90% of area covered
   Biogas Production
        200 to 300 cu meters/day
        88% Methane, 12% CO2
   Biogas tested in 10 KW Engine-
        Generator Set
   75% COD Reduction
Microturbine and Covered
         Lagoon
10 KW Engine-Gen Set
Biogas Measurement by Cal Poly
          Students
10 KW Engine-Generator Test on
           Biogas
Engine Generator at Full 10 KW
Covered Lagoon Effluent Pipe
     CONCLUSIONS
   10 KW Engine-Generator Test
        Input: 11 cubic meters/hr
        Output: 10 KW
        Efficiency:10%
   30 KW Microturbine Specification:
        Input: 13 cubic meters/hr
        Output: 28 KW
        Efficiency: 27%
   Effluent Characteristics:
        1000 to 1500 mg/l COD
        90 mg/l Ammonia
       BENEFITS OF
    ANAEROBIC DIGESTION
   Odor control

   Effective Manure and Nutrient
         Management

   Electrical Returns
         170,000 KWhrs/year
         $15,500/year
         75% of Demand

				
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