two years experience with ten capstone 30 kw units at the calabasas landfill
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TWO YEARS EXPERIENCE WITH TEN CAPSTONE 30 KW UNITS AT THE CALABASAS LANDFILL - PowerPoint PPT Presentation


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WASTEWATER RECLAMATION. SOLID WASTE MANAGEMENT. TWO YEARS EXPERIENCE WITH TEN CAPSTONE 30 KW UNITS AT THE CALABASAS LANDFILL. Mark McDannel Supervising Engineer Energy Engineering Section County Sanitation Districts of Los Angeles County. Presentation Overview.

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two years experience with ten capstone 30 kw units at the calabasas landfill
WASTEWATER RECLAMATION

SOLID WASTE MANAGEMENT

TWO YEARS EXPERIENCE WITH TEN CAPSTONE 30 KW UNITS AT THE CALABASAS LANDFILL

Mark McDannel

Supervising Engineer

Energy Engineering Section

County Sanitation Districts of Los Angeles County

presentation overview
Presentation Overview
  • Districts energy program overview
  • Description of Calabasas facility
  • Availability
  • Economics
  • Emissions
  • Siloxane removal
  • Conclusions
county sanitation districts of los angeles county
County Sanitation Districts of Los Angeles County
  • Confederation of 25 Independent Special Interest Districts
  • Operate and Maintain Regional Wastewater Treatment and Solid Waste Management Systems since 1920s
  • Service for 5 Million People and 78 Cities in Los Angeles County
districts solid waste management facilities
Districts’ Solid Waste Management Facilities

Facilities

  • 3 Active Sanitary Landfills
  • 3 Inactive Sanitary Landfills
  • 2 Recycle Centers
  • 1 Transfer Station
  • 1 Materials Recycling Facility
  • 4 Gas-to-Energy Facilities
  • 2 Refuse-to-Energy Plants

Capacity

  • Disposal of approximately 20,000 tons of trash per day (approximately half the County-wide disposal needs)
calabasas microturbine project
Calabasas Microturbine Project
  • First Power Plant at Calabasas Landfill due to poor LFG Quality (8000 cfm @ 20 to 25% Methane is Flared)
  • Minimum Level for Optimum Microturbine Performance is 35% Methane
  • Selective LFG Collection System Designed to Collect better quality LFG (150 cfm @ 40 to 45% Methane)
  • Power Produced is Sufficient to meet On-site Demands
factors affecting microturbine performance
Factors Affecting Microturbine Performance
  • GAS HANDLING AND CLEANUP
    • Moisture Removal
    • Industrial Compressor and Packaged Chiller
    • Treatment of Organics and Siloxanes
  • CONTROL SYSTEM
    • Ability to Load-Follow
  • DEDICATED LFG HEADER AND WELLS
    • Importance of Stable Fuel Flow and Quality
major equipment features
Major Equipment/Features
  • 10 Capstone C-30 Microturbines
  • Dedicated Header and LFG Wells
  • EM Inlet Moisture Separator
  • Davey 50 hp Compressor
  • Schreiber 10 ton Chiller
  • Elanco Gas/Gas and Gas/Water Heat Exchangers
  • Siloxane Sorbent Columns
  • Switchgear and Utility Equipment
  • Power Plant is integrated with Flaring Station and Condensate Collection System
periodic maintenance
Periodic Maintenance
  • Change Air Filters every 4000 hrs (Capstone recommended interval is 8000 hrs)
  • Chiller Service (Clean Screens and Fins to Prevent Plugging)
  • Service Compressor (Oil Change)
  • Sorbent Media Replacement
factors affecting availability
Factors Affecting Availability
  • Compressor problems
  • Gas line condensate problems-plugging and surging
  • Siloxane breakthrough
  • SCE power outages
    • No monitoring of system on nights and weekends
factors affecting capacity factor
Factors Affecting Capacity Factor
  • Ambient temperature
  • 9-turbine operation
  • System electrical demand
factors impacting o m cost
Factors Impacting O&M Cost
  • For reference, Ingersoll-Rand has offered fixed price O&M at 1.8¢/kW-hr for our Lancaster facility
  • Manufacturer does not offer turnkey O&M
  • Turbine service providers do not offer service for balance of plant
  • Consulting/service companies have had difficulties being cost-effective and responsive
air emissions
Air Emissions
  • Units operate under Permit and Rules of South Coast Air Quality Management District
  • Subject to Rule 1150.1, similar to USEPA Subpart WWW
  • Source test one unit every 1-5 years for NOx, CO, NMHC, particulate, trace organics
  • Full results available from author by request
siloxane sampling test program
Siloxane Sampling Test Program
  • Different types of sorbent were evaluated
        • Coconut Shell-Based Activated Carbon
        • Graphite-Based Activated Carbon
        • Silica Gel
  • Siloxanes are difficult to quantify, since the levels are often below the detection limit
  • Initial difficulty in detecting break-through has been resolved by improved analytical methods
siloxane levels in landfill gas
Siloxane Levels in Landfill Gas
  • Only compound above detection limit is D4 at 0.145 ppm
  • 55% of D4 is removed across the chiller (0.8 ppm removal)
  • Siloxane levels at Calabasas are lower than most landfills assessed
slide31
Siloxane in Landfill Gas

160

140

120

100

Siloxane, mg/M3

80

60

40

20

0

S4

G-3

G-2

G-1

S-1

S-2

S-3

S-5

S-6

S-7

S-8

S-9

C-BCU

D-Scholl

C-Lopez

C-Prima

C-Kiefer

NJ ~ LES

D-Spadra

C-Nashua

C-Modern

C-Lakeview

D-Calabasas

C-Omega Hills

D-Palos Verdes

C-Albuquerque

D-Puente Hills East

D- Puente Hills East

conclusions
Conclusions
  • Microturbines can be effectively operated on LFG with careful consideration to handling and treatment of LFG.
  • With subsidies, the plant was paid off in 27 months.
  • The facility operates at lower NOx levels than flares.
  • The facility meets most of the power needs of the landfill.
conclusions continued
Conclusions, continued
  • Removal of moisture and LFG contaminants was the single-most important factor in yielding a stable operation.
  • Silica gel is more effective and more cost-effective than activated carbon at removing siloxanes.
  • O&M costs remain relatively high compared to the Districts other microturbine.
  • Plant availability continues to increase as operating experience is gained.
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