Title:
Combustion of Two Imported Biomass Feedstocks for Co-firing in the UK
Author(s):
Gudka, B., Baxter, X.C., Darvell, L.I., Jones, J.M., Saddawi, A., Williams, A., Malmgren, A., Kilgallon, P.J., Simms, N.J.
Document(s):
Paper
Abstract:
Two commonly imported biomass feedstocks, Palm Kernel Expellers (PKE) and Distillers Dried Grains and Solubles (DDGS) have been examined for their combustion properties. The fuels were characterized and thermal decomposition tests were done using Thermogravimetric Analysis (TGA). Pyrolysis products were detected via Pyrolysis Gas ChromatograpyMass Spectrometry (Py GCMS) and lastly chars from the fuels were prepared and combustion tests were performed to determine the conversion of nitrogen in the char to nitrogen – containing species. The main ash forming alkali metals were K, Si, Ca, Mg and Na which resulted in high alkali indices hence high fouling tendencies. Thermal decomposition begins at a relatively low temperature and it is suspected that there is some oil evaporation occurring and this results in low activation energies for pyrolysis calculated from the apparent first order kinetics. Furthermore the pyrolysis products from Py GCMS include some fatty acids, as well as methoxy phenols and, in the case of DDGS, some nitrogen containing heterocyclic aromatic compounds. The high heating rate pyrolysis promoted depletion of nitrogen in the char; hence almost over 90% of it was released with volatiles. The main nitrogen containing compounds detected during char combustion were NOx and N2 and primary products include HCN, C2N2 and HCNO.
Keywords:
alkali, combustion, pyrolysis, biomass residues
Topic:
Thermochemical conversion - Combustion and co-combustion
Subtopic:
Prediction and abatement of corrosion and gas emissions in large biomass combustion and co-firing plants
Event:
18th European Biomass Conference and Exhibition
Session:
OA5.4
Pages:
1107 - 1112
ISBN-13:
978-88-89407-56-1
ISBN-10:
88-89407-56-5
Paper DOI:
10.5071/18thEUBCE2010-OA5.4
Price:
FREE
