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SAMPLE DATA OF
SPOKANE COUNTY
WASTE TO ENERGY FACILITY
Mandatory service area: Spokane County / 430,000
ratepayers
Type of contract: Full service/Operate Wheelabrator /
Waste Management
Ownership: City of Spokane
Financing ($110 million): Revenue Bonds - Mandatory debt
to entire County
Department of Ecology Grant ($60 million)
Start-up: 1991
Expenses and Revenues for 2009:
Cost of Operation $17.2 million ($62 per ton)
Cost of Ash Disposal $4.1 million ($47 per ton)
Cost of Debt $9 million
TOTAL COSTS $30.3 million
Electricity Revenue $11.4 million
Materials Recovery $0.1 million
NET COST OF OPERATIONS $18.8million ($68 per ton)
REFUSE COMBUSTION:
Operation: 24-hours per day, 7 days per week
Process Lines: 2 @ 400 tons-per-day
Plant maximum daily capacity: 800 tons
Average thru-put: 720 tons per day (365 days per year)
Feed system: 2 overhead refuse cranes with ram feeder
Grate design: Von Roll reciprocating
Combustion temperature: 2500° F
Auxiliary fuel: Natural gas
Waste weight reduction: 65%
Annual Greenhouse Gas Production 600,000,000 Pounds CO2
CO2 per MWH 4480 pounds of total CO2 per Megawatt Hour:
1580 pounds of fossil CO2 / MWh plus,
2900 pounds of bio CO2 / MWh
Ash handling system: Semi-dry, vibrating pan conveyor
Materials recovery: 10", aggregate, ferrous
Air Quality Control: Type of equipment: Dry
scrubbers-Fabric filters-deNOx (2 units)
Energy Production:
-
Type of
energy: Electric power
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Steam flow
to turbine: 188,000 pph @ 830 psig/825° F
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Heat energy
produced: 125 megawatts
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Average
sellable electricity output: 16.1 megawatts (141,000
MWh/year, 8760 hours in a year)
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Efficiency:
13%
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Cooling
system: Air cooled condenser
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Customer:
Puget Sound Power and Light Inc.
Facts & Figures:
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Plant
Maximum Capacity: Equals 800 Tons/day, two 400/ton
per day boilers.
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Guaranteed
capacity: 248,200 Tons/yr., 720 tons/day
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Effective
maximum capacity: 275,000 Tons/yr
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Max
capacity reached: 1992, excess hauled to Klickitat
County
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Electrical
output: 26 megawatts maximum - 20 megawatts average
- 16 MW sold
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Turbine
Speed: 3600 rpm producing 60 Hertz (60 cycles/sec)
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Pit
Dimensions & capacity: 140’ x 50’ x 40'; 40’ back
wall; 4800 tons
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Receiving
floor: 62,000 square ft. or 1.4 acres
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Stack: 175’
tall, preformed concrete sections, contains three
flues
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Fire
Temperature: 2500 degrees F
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Temp/Velocity of exiting stack gases: 250 degrees F,
4000 ft per minute
Construction involved:
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16,415
cubic yards of concrete
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198,692
cubic yards soil imported
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45,251 feet
of pipe
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3,248 Tons
of structural steel
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350,829
feet/66.445 miles of cable
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10,740
feet/2.3 miles of cable tray
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2,396 field
welds
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Time to
construct: 22 months
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First
refuse fire: September 6, 1991
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Refuse
crane: capacity = 9 tons or 6.5 cubic yards; Typical
load = 2-3 tons
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Computer
System: Bailey Network 90
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Cost: 110
Million dollars, largest capital project for City of
Spokane.
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Ownership:
City of Spokane.
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Debt
responsibility: City of Spokane & Spokane County &
all municipalities within.
Design, construct, operate and maintain for 20 years at
100% profit margin.
Technology:
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Ash
Quantity: 65% reduction by weight of original MSW
weight.
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Ash
Disposal: Rabanco Regional Landfill, Klickitat
County (near Roosevelt, WA).
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Ash
Transport: Container capacity 15 tons.
Configuration: two containers per load, 30 tons per
truck, 8-10 truckloads/day. Intermodal train
container, 25-28 ton capacity.
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Iron
recovery: 2.5% of original weight of MSW. Iron is
not recovered with traditional landfilling.
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Built for
expansion: Extended Conveyors; Big pit; Extra flue
in stack; Boiler APC turbine needed
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Air Cooled
Condenser: Totally dry cooling-6 cells, 150 HP
motors
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Boiler tube
length: Approximately 100 feet, suspended from roof
structural steel
Bag Houses:
Bag houses contain 3420 bags (1710 per boiler line).
Filtering bags are made of Gore-Tex fabric.
Continuous Emission Monitors: Read every 15 seconds-02,
S02, Nox, Opacity, CO, Temperature
Property Area: 52 Acres
Similar technology:
No
Waste-to-Energy sites have been built in the U.S. for
the last 15 years. Wheelabrator operates 13 other
similar old facilities in the U.S. There are over 500
plants in the world, approximately 136 using the same
basic technology. More than 20 equal to or larger than
800 TPD.
Regulatory Agencies:
Spokane Air Pollution Control Authority (SCAPCA)
Washington Department of Ecology (WDOE)
Spokane Regional Health District (SRHD).
BTU values:
Garbage = 4,800/pound
Coal = 12,000/pound
Plastic = 14,000/pound
Tires = 16,000/pound
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