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The influence of sulphur additions on the corrosive environment in a waste-fired CFB boiler

Jesper Pettersson (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Carolina Pettersson (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Nicklas Folkeson (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Lars-Gunnar Johansson (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Erik Skog (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Jan-Erik Svensson (Institutionen för kemi- och bioteknik, Oorganisk miljökemi)
HIGH-TEMPERATURE OXIDATION AND CORROSION 2005 (0255-5476 ). Vol. 522-523 (2005), p. 563-570.
[Artikel, refereegranskad vetenskaplig]

Corrosion/deposition field tests have been carried out in the superheater region of a commercial waste-fired 75MW CFBC boiler using air cooled probes. The influence of material temperature (450-500 degrees C), flue gas temperature, temperature variations (i.e. thermal cycling) and additives to the fuel (elemental sulphur and dolomite) on deposition and corrosion was studied. The results presented here mainly consider the influence of sulphur additions to the fuel. The fuel was a mixture of 50% household waste and 50% industrial waste. After exposure the samples were analyzed by ESEM/EDX, XRD, AAS, FIB and IC. With no additional sulphur, alkali chlorides made up a large part of the deposit/corrosion product layer and in some cases chromate (VI) was detected. It is suggested that the chromate (VI) has formed by reaction of the protective oxide with alkali chlorides in the deposit. Adding sulphur to the fuel changed the composition of the deposits, alkali chlorides being largely replaced by alkali sulphates. No chromates(VI) were detected in the sulphur-added runs. It is suggested that adding sulphur to the fuel may decrease fireside corrosion because it changes the composition of the deposit. Alkali sulphates are much less corrosive than alkali chlorides partly because they do not form chromate(VI).

Nyckelord: field tests; waste; high temperature corrosion; sulphur; chlorine; alkali; deposits

Addresses: 1. Chalmers Univ Technol, Dept Environm Inorgan Chem, High Temp Corros Ctr, S-41296 Gothenburg, Sweden 2. Carl Bro Energikonsult AB, Energisyst, S-20509 Malmo, Sweden E-mail Addresses: jpetter@chalmers.se, carpe@chalmers.se, nicklas.folkeson@chalmers.se, lg@chem.gu.se, erik.skog@carlbro.se, jes@chalmers.se

Denna post skapades 2009-02-04. Senast ändrad 2014-11-10.
CPL Pubid: 89607


Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Oorganisk miljökemi (2005-2014)



Chalmers infrastruktur