Database of Biomass Cofiring initiatives
Over the past 5-10 years there has been remarkably rapid progress over in the development of cofiring. Several plants have been retrofitted for demonstration purposes, while another number of new plants are already being designed for involving biomass co-utilization with fossil fuels. IEA Bioenergy Task 32 has compiled a database to provide an overview of this experience.
Typical power stations where co-firing is applied are in the range from approximately 50 MWe (a few units are between 5 and 50 MWe) to 700 MWe. The majority are equipped with pulverised coal boilers (tangentially fired, front-wall fired, back-wall fired, dual-wall fired and cyclone). Furthermore, bubbling and circulating fluidized bed boilers, cyclone boilers, and stoker boilers are used. Tests have been performed with every commercially significant (lignite, sub-bituminous coal, bituminous coal, and opportunity fuels such as petroleum coke) fuel type, and with every major category of biomass (herbaceous and woody fuel types generated as residues and energy crops).
Basically one can distinguish three different concepts for cofiring biomass in pulverised coal boilers, all of which have already been implemented either on a demonstration or a fully commercial basis, and each with its own particular merits and disadvantages:
More detailed information about the possibilities and limitations of cofiring are described can be found in a background paper, available here.
IEA Bioenergy Task 32 has prepared a global overview of around 150 initiatives where biomass is cofired in boilers that use different types of coal as the main fuel. The dataset is available as a searchable database on this website.
This internet site contains a database that describes cofiring initiatives world-wide. Here, the following definition of cofiring has been used:
substitution of coal as a main fuel
This definition implies that the partial substitution of biomass with relatively small amounts of coal (also referred to as 'reverse cofiring'), which is increasingly done in several fluidized bed installations in Scandinavia to decrease ash related problems in boilers, is not included in this overview.
The information in this database has been extracted from many different information sources and compiled in a structured way so that it can be easily evaluated. Task 32 of the IEA Bioenergy Agreement does not accept any liability related to incorrect representation or interpretation of the used data.
Development of the database has been done in cooperation by TNO in close collaboration with the other organsations represented in Task 32. In case you wish to see any additions or modifications, please contact Jaap Koppejan.
Version 2.0, © IEA Bioenergy Task 32, last updated in 2009