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THOMPSON RIVER COGENERATION PLANT

“15 MW capacity thermal/electric cogeneration facility”

Project Description

Thompson River Power (TRP) is a 15 megawatt capacity thermal/electric cogeneration facility located in the community of Thompson Falls, Montana. Based around a B&W traveling grate stoker boiler and a 16.5 megawatt (gross) Elliott turbine/generator, the facility is fired on Montana-produced coal and residual wood fuels generated from the local forest products industry. Electric energy is sold to regional utilities and thermal energy (extraction steam) to an adjacent sawmill for space heating and drying of lumber. Initially placed into service in 2004, the facility operated intermittently for 12 months before shutting down; failing in that time to achieve either expected production levels or required levels of air quality emissions.

 

Project Details

Client Thompson River Power
Date 2008
Services Project Development and Operations and Maintenance
Location Thompson Falls, Montana

Project Features

Starting in 2006 the project owners brought Precision Energy Services (PES) onboard to address the many plant challenges and issues. Specifically:

  • Address Production Limitations Building from a thorough inspection and evaluation of the turbine island and support infrastructure, PES disassembled, refurbished, and upgraded steam path components yielding a 4 percent increase in production. Adjustments and upgrades to circulating water system components increased capacity to design levels, enabling full-scale plant production.
  • Air Quality Emissions Controls PES designed/specified, procured, and supervised installation and commissioning of a wet tower sulfur dioxide (SO2) removal scrubber replacing a dry venturi-style system that did not perform; an upgraded overfire air (OFA) and new flue gas recirculation (FGR) system to reduce thermal formation of nitrous oxides (NOx) and carbon monoxide (CO); a selective non-catalytic reduction system (SNCR) to further remove flue gas NOx; and a continuous emissions monitoring system (CEMS).
  • Balance of Plant PES rebuilt/refurbished/replaced numerous major plant systems/components that were found to have failed, were damaged, or to be inadequate for operating/reliability needs. Plant-wide controls were expanded to accommodate newly-installed equipment, provide a better level of operator monitoring and control, improve reliability, and support new operator interfaces.
  • Startup/Operations and Maintenance PES is engaged by project owners to recruit and train plant staff, commission systems, start up the facility, and stay on as long-term O&M contractor.

Project Features

PES rebuilt/refurbished/replaced numerous major plant systems/components that were found to have failed, were damaged, or to be inadequate for operating/reliability needs. Plant-wide controls were expanded to accommodate newly-installed equipment, provide a better level of operator monitoring and control, improve reliability, and support new operator interfaces.

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