City of Tacoma Power Plant
Retrofit
50 MWe Fluid Bed Plant Retrofit 528,000 PPH
(Refuse Derived Fuel (RDF) Coal & Wood) 425 psi, 725 F
Owner
Tacoma Public Utilities
Project Location
Tacoma, Washington
Project Completion
November 1989
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Project Description
This project entailed the retrofit and reconditioning of an existing 50 MWe utility power
plant located in the tideflats industrial region of Tacoma. The plant included two
pulverized coal-fired boilers each rated at 25 MW capacity. The conversion of each boiler
to external fluid bed combustion allowed the simultaneous firing of wood, coal, and refuse
derived fuel (RDF). The existing turbines were reconditioned. All new fuel handling
equipment for wood, coal and RDF was provided. New economizers, superheaters, baghouses
and fans were supplied for each boiler.
Scope of Supply
EPI was responsible for the design, manufacture and commissioning of two dual-phase fluid
bed combustion units, wood and RDF fuel receiving and handling system, and a multiple fuel
blending and feed system. In addition to 350 tons per day of processed municipal waste
from the City of Tacoma, the units combust a blend of wood waste and coal.
The existing boilers were reconditioned and supplied with new superheat sections.
In-bed and vapor space heating surface in the fluid beds maintain the original plant steam
rating of 528,000 pounds per hour at 425 psi and 750 F. Gas cleanup is accomplished by new
baghouse assemblies.
