Abstract
Utilisation of solid biofuels and wastes sets new demands for fuel
handling and feeding systems, as well as for boiler design and combustion
technologies. Especially ash quality of wood fuels differs remarkably
chemically from ashes of peat or coals and other fossil fuels. The alkaline
metals, which are usually responsible for fouling of heat transfer surfaces,
are abundant in wood and will be released during combustion easily in gas
phase. The combustion and co-firing properties of fuels have been studied both
in VTT's test facilities and in industrial-scale power plant boilers. The
formation of alkaline and chlorine compounds and their effect on boiler
fouling and corrosion have been monitored by cooled temperature controlled
deposit and material probes. The experimental studies clearly showed that if
sulphur existed in combustion environment, chlorine was released as HCl and
did not drift into deposits. Fouling of the boiler effects on several factors
at the plant. These factors, e.g. the increment of operating and maintenance
costs caused by fouling of the boiler, can increase the energy production
costs significantly. In addition to increased need for soot blowing and
cleaning, as well as the possible renovation need of the super heaters, the
efficiency of the boiler decreases as thermally insulating ash deposits on the
heat transfer surfaces of the boiler. By the side of these factors costs are
caused by more often replaced bed material, the increased need for power
consumption of the plants, and storage costs of wood fuels
Original language | English |
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Title of host publication | EUBCE Conference Proceedings 2002 |
Publisher | ETA-Florence Renewable Energies |
Number of pages | 4 |
ISBN (Electronic) | 88-900442-7-6 |
ISBN (Print) | 88-900442-5-x |
Publication status | Published - 2002 |
MoE publication type | B3 Non-refereed article in conference proceedings |
Event | 12th European Conference and Exhibition on Biomass for Energy, Industry and Climate Protection - Amsterdam, Netherlands Duration: 17 Jun 2002 → 21 Jun 2002 Conference number: 12 |
Conference
Conference | 12th European Conference and Exhibition on Biomass for Energy, Industry and Climate Protection |
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Country/Territory | Netherlands |
City | Amsterdam |
Period | 17/06/02 → 21/06/02 |
Keywords
- co-combustion
- operating experiences
- fluidized beds