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Sewage sludge as a deposit inhibitor when co-fired with high potassium fuels

Anna-Lena Elled (Institutionen för energi och miljö) ; Kent Davidsson (Institutionen för energi och miljö) ; Lars-Erik Åmand (Institutionen för energi och miljö, Energiteknik)
Biomass & Bioenergy (0961-9534). Vol. 34 (2010), 11, p. 1546-1554.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Biomass, Stem wood, Wood pellets, Straw pellets, Ammonium sulphates, Kaolin, Zeolites, Municipal sewage sludge, Alkali, Potassium, Deposit, formation, Fluidised bed combustion, fluidized-bed combustion, chlorine deposition, biomass combustion, alkali capture, rich biomass, gas-phase, kaolin, straw, release, boiler



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Denna post skapades 2010-09-10. Senast ändrad 2016-06-21.
CPL Pubid: 126036

 

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