Sewage sludge as a deposit inhibitor when co-fired with high potassium fuels
Journal article, 2010
The objective of this work is to survey the fate of potassium in the gas phase of a fluidised bed boiler and gain deeper understanding of the involved mechanisms during co-firing of municipal sewage sludge with biomass containing high amounts of potassium and chlorine. The results show that formation of alkali chlorides in the flue gas and corrosive deposits on heat transfer surfaces can be controlled by addition of municipal sewage sludge even though the fuel is highly contaminated with chlorine. The beneficial effects are partly due to the content of sulphur in the sludge, partly to the properties of the sludge ash. The sludge ash consists of both crystalline and amorphous phases. It contains silica, aluminium, calcium, iron and phosphorus which all are involved in the capture of potassium. (c) 2010 Elsevier Ltd. All rights reserved.
Biomass
Wood pellets
Potassium
Alkali
Municipal sewage sludge
Ammonium sulphates
chlorine deposition
Straw pellets
fluidized-bed combustion
gas-phase
kaolin
boiler
biomass combustion
Kaolin
Deposit
release
alkali capture
Fluidised bed combustion
formation
straw
Zeolites
rich biomass
Stem wood
Author
Anna-Lena Elled
Chalmers, Energy and Environment, Energy Technology
Kent Davidsson
Chalmers, Energy and Environment, Energy Technology
Lars-Erik Åmand
Chalmers, Energy and Environment, Energy Technology
Biomass and Bioenergy
0961-9534 (ISSN) 18732909 (eISSN)
Vol. 34 11 1546-1554Driving Forces
Sustainable development
Subject Categories
Energy Engineering
Other Environmental Engineering
Areas of Advance
Energy
Infrastructure
Chalmers Power Central
DOI
10.1016/j.biombioe.2010.05.003