Biomass Coal-to-biomass conversions for efficient thermal power

Doosan Babcock

Doosan Babcock Biomass

Coal-to-biomass fuel conversions give you access to efficient power generation and lower emissions. Doosan Babcock has decades of experience in developing 100% biomass and biomass co-firing combustion systems, with large-scale references across Europe and North America.

Breathing new life into your plant

Optimum asset utilisation

Coal has fuelled power generation for over 100 years, but the need to tackle climate change is challenging its future viability. As a result, existing coal plants are at risk of closure despite having significant design life left, which is subsequently leaving utilities with stranded assets and putting considerable pressure on reserve capacity margins.

Doosan Babcock’s biomass conversions allow you to continue to utilise these assets, avoiding the need to build new plant or close coal plants which may have only used a fraction of their design life, while at the same time offering low-cost CO2 neutral power generation.

Flexible coal-to-biomass conversion solutions

• Attractive economics as the capital outlay for the existing plant is often fully or partially depreciated.

• Opportunity to bring plant to modern standards and renew time-expired components with modern equivalents and increase plant performance with modern high efficient turbine components. • Bespoke technologies designed to meet each plant’s needs.

• Opportunity to meet future NOx and SOx compliance with lower capital expenditure due to the low nitrogen content and lack of sulphur in biomass fuels.

• Conversion technologies focus on boiler plant, PF and CFB combustion; steam turbines, from simple refurbishment to full steam path retrofit; and life-time extension to match the plant future.

• Wood from sustainable sources is clean, renewable and carbon neutral.

Compliance with future NOx and SOx emissions regulations

Extended life and limited capital outlay

Bespoke technologies tailored to your plant

Fuel handling (bunker/feeder modifications)

Mill air temperature

reduction

Furnace cleaning devices

Secondary NOx control

Milling plant (replace /modify)

Turbine (efficiency upgrade)

Feedwater heaters (low feed

temperatures)

Combustion system (biomass

modifications)

Dust collection (upgrade/refurbish)

Flue gas cooler

Superheater/economiser (surface modifications)

Air heater temperature adjustments

Typical conversion scope • Upgrade of the fuel handling system for biomass is required including fire and explosion suppression.

• Existing vertical spindle mills may be modified or replaced with new vertical spindle or hammer mills as appropriate.

• Reduction of mill inlet temperature is required due to lower ignition temperature of wood. Additional heat can be recovered to minimise impact on efficiency.

• Existing burners may need to be modified due to larger particle size of pulverised wood, or alternatively a new low NOx biomass combustion system can be provided.

• Additional primary or secondary NOx control technologies such as OFA, BOFA or SNCR may be required to meet emissions compliance.

• Bottom ash systems may need replacing with a dry bottom ash conveyer.

• Primary air fans may require upgrading due to higher pressure drop associated with transportation of biomass.

• Modifications of heat transfer surfaces such as the superheater or economiser may be required, dependent on boiler design.

• Additional water lances or soot blowers may need to be installed to control ash coatings on heating surfaces.

• Efficiency improvement measures such as flue gas cooler or turbine upgrades can be utilised to maximise efficiency.

Doosan Babcock Biomass

Our burner technologiesDoosan Babcock is a trusted partner for the delivery of reliable and efficient steam production, bringing together over a century of experience in burner design to provide combustion technologies that maximise the performance of your plant.

Doosan Babcock‘s 70MWth Clean Combustion Test Facility is the world’s largest burner test facility, designed for the development of combustion systems. In 2013, the facility was upgraded to enable the firing of wood pellets. Operated to the highest environmental standards, our test facility is capable of testing full scale burners up to 70 MWth and firing a wide range of coals from anthracite, bituminous and sub-bituminous to pre-dried lignite and biomass fuels.

Optimum asset utilisation

Doosan Babcock‘s biomass burner builds on our Mark III burner technology, utilising the widely proven air register design in conjunction with an optimised fuel cartridge, specifically designed for biomass fuels.

Doosan Babcock has developed a low NOx biomass burner that efficiently fires both white and black pellets.

Our 2nd generation low NOx biomass burner showed a consistent 45-50% NOx reduction over our 1st generation biomass burner across a typical range of operating stoichiometries.

We supply and install new combustion systems and controls, make all the necessary modifications to boiler pressure parts and tubes, and address impacts in auxiliary systems.

Doosan Babcock Biomass

Our experienceDoosan Babcock’s technologies are behind some of the world’s largest biomass plants, helping customers meet the requirements of regulatory compliance, while at the same time providing efficient and reliable power generation.

Project name, country Scope Fuel Units x MWe Contract award date Customer

Yeong Dong, Korea 100% biomass conversion; conver-sion of downshot boiler

White pellets

1 x 110

2015

KOSEP

Lynemouth, UK 100% biomass conversion; FEED study completed

Black / white pellets

3 x 140 2014 RWE

Gardanne, France 100% coal-to-biomass conversion, turbine upgrade and life extension

Various biomass

1 x 170

2013

Societe Nationale d‘Electricite et de Thermique

Drax, UK Conversion of E-mills and asso-ciated burners from coal to wood pellet firing

White pellets

2 x 660

2012

Drax Power Limited

Drax, UK Conversion of three E-mills and associated burners from coal to wood pellets

White pellets

1 x 660

2011

Drax Power Limited

Ironbridge, UK 100% coal-to-biomass conversion of Units 1 and 2

White pellets 2 x 370 2011 E.ON UK

Atikokan, Canada 100% biomass firing White pellets 1 x 220 2011 Ontario Power Generation

Drax, UK Conversion of two E-mills from coal to wood pellet firing

White pellets 1 x 660 2010 Drax Power LImited

Rybnik, Poland Biomass unloading, storage and milling

White pellets N/A 2010 EDF

Drax, UK Installation of 12 direct injection biomass co-firing systems

White pellets

6 x 660

2009

Drax Power Limited

Hasselby CHP, Sweden Conversion of coal mills and burners to 100% wood pellet firing

White pellets

3 x 75 1992-1993

Hasselby Power

Doosan Babcock Doosan House Crawley Business QuarterManor Royal, CrawleyWest Sussex RH10 9ADUnited KingdomTel: +44 (0) 1293 612888

Porterfield RoadRenfrew, PA4 8DJUnited KingdomTel: +44 (0) 141 886 4141 www.doosanbabcock.com

Project name, country Scope Contract

award date Customer

Tilbury, UK Biomass co-firing system design study 2001 RWE

Ferrybridge UK Biomass (olive residue) co-firingconsultancy and testing

2002 AEP

Ironbridge, UK Biomass co-firing trials 2003 TXU

Cottam, UK Biomass co-firing consultancy andtesting

2003 EDF Energy

Drax, UK Biomass co-firing consultancy and trial work 2003 Drax Power Limited

Cockenzie and Longannet, UK

Biomass (sawdust) co-firing by premixing and co-milling: consultancy and trial work

2004 Scottish Power

Drax, UK Direct injection system design 2005 Drax Power Limited

Kilroot, UK Biomass (olive residue) co-firingconsultancy and testing

2005 AES

Trenton, UK Direct biomass co-firing system study (25% heat input) 2009 Nova Scotia Power Inc

Drax, UK Installation of 12 direct injection biomass co-firing systems 2009 Drax Power Limited

Biomass co-firing

Project name, country Scope Contract

award date Customer

Hasselby CHP, Sweden

Design study for conversion of coal mills and burners to 100% wood pellet firing

1992 Hasselby Power

Burger, USA Feasiibility study for conversion from coal to 100% biomass firing 2009 First Energy

Nanticoke, Canada

Design study for conversion of pulverisers from coal to 100% biomass (wood pellets)

2009 Ontario Power Generation

Drax, UK 100% biomass firing feasibility study 2010 Drax Power Limited

Uskmouth, UK 100% biomass firing feasibility study 2010 SSE

Atikokan, Canada

100% biomass firing FEED study 2010 Ontario Power Generation

Nanticoke, Canada

Feasibility study for conversion of a pulverised coal boiler to co-firing of biomass and natural gas

2010 Ontario Power Generation

Ironbridge, UK 100% biomass firing feasibility study 2011 E.ON UK

Tilbury, UK Feasibility and FEED studies for the conversion of a pulverised coal boiler to 100% wood firing

2011 RWE

Biomass feasibility and feed studies