Title:
Gas Desulfurization with Solid By-Products from Thermo-Chemical Conversion of Sewage Sludge
Author(s):
Gil-Lalaguna, N., Sánchez, J.L., Murillo, M.B., Gea, G.
Document(s):
Paper
Slide presentation
Abstract:
This work aims to study the desulfurization ability of the solid by-products obtained from both combustion and gasification of sewage sludge. Due to its metal content (calcium and iron oxides among others), sewage sludge ash could be a potential hot desulfurization sorbent. Desulfurization tests were carried out in a lab-scale fixed bed reactor operating at 600-800 ºC and under different gas atmospheres containing H2S. The reduced atmosphere created by the gasification gas was detrimental for H2S removal. Thermal instability of iron oxides in reducing atmospheres may be the main reason for this result. The presence of steam in the gasification gas also affected negatively the final sulfur content in the ash due to the simultaneous regeneration of the spent metal sulfides. In general, sewage sludge combustion ash (rich in Fe2O3) showed better desulfurization performance than sewage sludge gasification ash (rich in Fe3O4).
Keywords:
combustion, gas cleaning, gasification, sewage sludge, ashes
Topic:
Biomass Conversion Technologies for Heating, Cooling and Electricity
Subtopic:
Gasification for synthesis gas production
Event:
22nd European Biomass Conference and Exhibition
Session:
2BO.9.2
Pages:
462 - 466
ISBN:
978-88-89407-52-3
Paper DOI:
10.5071/22ndEUBCE2014-2BO.9.2
Price:
FREE
