Advanced biomass based combined heat and power system
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Advanced Biomass-based Combined Heat and Power System. Combined Heat & Power in the Pacific Northwest October 15, 2002 Nathan E. Carpenter Manager, Energy Boise. Presentation Outline. Forest Industry Energy Overview Typical Forest Industry CHP Application Proposed Next Generation Systems

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Advanced biomass based combined heat and power system

Advanced Biomass-based Combined Heat and Power System

Combined Heat & Power in the Pacific Northwest

October 15, 2002

Nathan E. Carpenter

Manager, Energy

Boise


Presentation outline

Presentation Outline

  • Forest Industry Energy Overview

  • Typical Forest Industry CHP Application

  • Proposed Next Generation Systems

  • Technology Gaps

  • Policy Issues

  • Summary


Forest industry energy overview

Forest Industry Energy Overview

  • Ranked third in overall energy intensity

  • Main users are the integrated pulp & paper facilities

  • Industry 54% self-sufficient, mainly due to biomass

  • ~65% of thermal needs generated internally

  • ~25% of electrical needs generated internally


Typical forest industry chp system

Natural

Gas

BFW

Steam

to Mill

Air

Bark &Solids

Typical Forest Industry CHP System

  • Conventional stoker fired combination fuel boiler

  • High pressure topping cycle using back-pressure steam turbine-generator with low pressure exhaust to process heat loads

  • Natural gas used strategically to increase reliability and stabilize combustion

  • Fuel to electricity efficiency 62-73%(cogeneration mode with some natural gas firing)

  • Capital $1500 to $2000 / kw

To Flue Gas Cleanup

SteamTurbine

Stoker Boiler

Ash & Char


Traditional igcc approach to biomass based power generation

“Traditional” IGCC Approach to Biomass-based Power Generation

  • High pressure (15-25 ATM) biomass feeders, gasifier, ash and fines removal, and hot gas cleanup system

  • Low caloric value gas turbine topping cycle and steam turbine bottoming cycle

  • Fuel to electricity efficiency 35-40%

  • Capital $1500 to $2500 / kW

  • NOx emissions over 150 ppm

Bark & Sludge

Hot fuel gas

High PressureHot Gas Cleanup

High Pressure Feed System

High PressureFly AshRemoval

HighPressureGasifier

Clean Fuel Gas

Fly Ash

High PressureCombustor

Air

Air toGasifier

Gas Turbine

High PressureAshRemoval

Water

Air

Ash

Steam

Heat

Recovery

Steam

Generator

Steam Turbine

Flue gas

Condenser


Evolutionary approach to biomass based power generation

Natural

Gas

BFW

High PressureCombustor

Steam

to Mill

Air

Natural

Gas

(Backup)

Bark &Solids

“Evolutionary” Approach to Biomass-based Power Generation

(Backup)

  • H2-rich syngas increases wood waste utilization and boiler capacity

  • Low pressure biomass feeders, gasifier, and ash systems

  • System uses existing flue gas cleanup system

  • Gas turbine topping cycle only-using HP heated air as working fluid

  • Natural gas used strategically to increase reliability and increase power generation efficiency

  • Fuel to electricity efficiency 65-73% (cogeneration mode)

  • Capital $1000 to $1500 / kW

  • NOx emissions below 60 ppm

2200 F

1800 F

To Existing Flue Gas Cleanup

Gas Turbine

Syngas

Existing Stoker

Gasifier

Ash & Char

Ash


Benefits and features of advanced biomass based power generation

Utilizes existing infrastructure

Increased biomass usage for electricity generation

Increased biomass usage for steam generation

Improves boiler performance

Improved load following

Increased efficiency

Higher carbon burnout

Increased steam capacity

Reduced electricity costs

Reduced emission

Natural

Gas

BFW

High PressureCombustor

Steam

to Mill

Air

Natural

Gas

(Backup)

Bark &Solids

Benefits and Features of Advanced Biomass-based Power Generation

(Backup)

2200 F

1800 F

To Existing Flue Gas Cleanup

Gas Turbine

Syngas

Existing Stoker

Gasifier

Ash & Char

Ash


Technology gaps

Natural

Gas

BFW

High PressureCombustor

Steam

to Mill

Air

Natural

Gas

(Backup)

Bark &Solids

Technology Gaps

(Backup)

  • Materials for HPHT Air Heater

  • Gas Turbine System for HPHT Air

  • Utilization of Hot Air Generation

  • System Integration

2200 F

1800 F

To Existing Flue Gas Cleanup

Gas Turbine

Syngas

Existing Stoker

Gasifier

Ash & Char

Ash


Policy issues

Policy Issues

  • Permitting hurdles

  • Recognition of societal benefits

  • Technical support

  • Financial incentives


Summary

Summary

  • Forest products facilities are excellent host sites for distributed, combined heat and power projects

  • Renewable energy based

  • Additional societal benefits

  • Regional synergies

  • Need financial incentives and technical support


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