Title:
Characterisation of Ash from Pilot-Scale Fluidised Bed Combustion of Miscanthus and Willow
Author(s):
Khodier, A.H.M., Simms, N.J., Oakey, J.E., Kilgallon, P.J.
Document(s):
Paper
Abstract:
Biomass is a promising fuel for process heating, space heating, or CHP that can meet renewable energy planning requirements or emissions trading targets. Miscanthus and willow are C4 herbaceous plants that have been identified as good fuel crops that are relatively easy to grow and harvest, and have received a great deal of interest in the UK. Both plants give a high dry-matter yield suitable for the conversion processes. However, the combustion of biomass can lead to ash deposition problems that can cause enhanced corrosion and/or loss in efficiency of the plant and in case of fluidised bed technology cause defluidisation problems. The combustion behaviour, gas compositions and ash formation/deposition characteristics resulting from combustion of miscanthus and willow in a 150 kWth pilot-scale combustion test rig has been investigated. The flue gas composition (CO2, O2, H2O, SO2, CO, NO, NO2, N2O, HCl and HF) was monitored on-line using a high resolution multi-component Fourier Transform Infra-Red (FTIR) gas analyser. Ash samples were collected from the fluidised bed, from fly ash (from the hot gas path and cyclone) and from ash deposits formed on air cooled probes (surface temperature of 500 °C) that simulate a oi oooooooheat exchanger. The ash samples were analysed using a Scanning Electron Microscopy with Energy Dispersive X-ray (EDX) analysis and X-ray Diffraction (XRD) to assess the corrosion/sintering potential of the ash particles. Thermodynamic modelling software (Metallurgical and Thermodynamic Databank, (MTDATA)) was used to make predictions for the partitioning of a range of elements during combustion of both biomasses and the results compared to the measured experimental data.
Keywords:
ashes, biomass, emissions, fluidized bed, willow, Miscanthus
Topic:
Thermochemical conversion - Combustion for small scale applications
Subtopic:
Combustion for small scale applications
Event:
18th European Biomass Conference and Exhibition
Session:
VP2.5.28
Pages:
1360 - 1366
ISBN-13:
978-88-89407-56-1
ISBN-10:
88-89407-56-5
Paper DOI:
10.5071/18thEUBCE2010-VP2.5.28
Price:
FREE
