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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

  • Steam flow to turbine: 188,000 pph @ 830 psig/825 F

  • Heat energy produced: 125 megawatts

  • Average sellable electricity output: 16.1 megawatts (141,000 MWh/year, 8760 hours in a year)

  • Efficiency: 13%

  • Cooling system: Air cooled condenser

  • Customer: Puget Sound Power and Light Inc.

 

Facts & Figures:

  • Plant Maximum Capacity: Equals 800 Tons/day,  two 400/ton per day boilers.

  • Guaranteed capacity: 248,200 Tons/yr., 720 tons/day

  • Effective maximum capacity: 275,000 Tons/yr

  • Max capacity reached: 1992, excess hauled to Klickitat County

  • Electrical output: 26 megawatts maximum - 20 megawatts average - 16 MW sold

  • Turbine Speed: 3600 rpm producing 60 Hertz (60 cycles/sec)

  • Pit Dimensions & capacity: 140 x 50 x 40'; 40 back wall; 4800 tons

  • Receiving floor: 62,000 square ft. or 1.4 acres

  • Stack: 175 tall, preformed concrete sections, contains three flues

  • Fire Temperature: 2500 degrees F

  • Temp/Velocity of exiting stack gases: 250 degrees F, 4000 ft per minute

 

Construction involved:

  • 16,415 cubic yards of concrete

  • 198,692 cubic yards soil imported

  • 45,251 feet of pipe

  • 3,248 Tons of structural steel

  • 350,829 feet/66.445 miles of cable

  • 10,740 feet/2.3 miles of cable tray

  • 2,396 field welds

  • Time to construct: 22 months

  • First refuse fire: September 6, 1991

  • Refuse crane: capacity = 9 tons or 6.5 cubic yards; Typical load = 2-3 tons

  • Computer System: Bailey Network 90

  • Cost: 110 Million dollars, largest capital project for City of Spokane.

  • Ownership: City of Spokane.

  • Debt responsibility: City of Spokane & Spokane County & all municipalities within.

 

Design, construct, operate and maintain for 20 years at 100% profit margin.

 

Technology:

  • Ash Quantity:  65% reduction by weight of original MSW weight.

  • Ash Disposal: Rabanco Regional Landfill, Klickitat County (near Roosevelt, WA).

  • 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.

  • Iron recovery: 2.5% of original weight of MSW. Iron is not recovered with traditional landfilling.

  • Built for expansion: Extended Conveyors; Big pit; Extra flue in stack; Boiler APC turbine needed

  • Air Cooled Condenser: Totally dry cooling-6 cells, 150 HP motors

  • 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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