You need JavaScript to view this

High temperature corrosion in biomass- and waste fired boilers. A status report; Kunskapslaeget betraeffande hoegtemperaturkorrosion i aangpannor foer biobraensle och avfall

Abstract

Many biomass- or waste-fired plants have problems with high temperature corrosion on the furnace walls or at the superheaters, especially if the steam temperature is greater than 500 deg C. An increase in the combustion of waste fuels means that an increasing number of boilers have had problems. Therefore, there is great interest from plant owners to reduce the costs associated with high temperature corrosion. At the same time there exists a considerable driving force towards improving the electrical efficiency of a plant by the use of more advanced steam data. The purpose of the work presented here was to answer three main questions: What can be done to reduce high temperature corrosion with current fuel blends and steam temperatures? How can more waste fuels be burnt without an increased risk for corrosion? What needs to be done to reach higher steam temperatures in the future? The level of knowledge of high temperature corrosion in biomass- and waste-fired boilers has been described and summarised. The following measures are recommended to reduce corrosion in existing plant: Make sure that the fuel is well mixed and improve fuel feeding to obtain a more even spread of the fuel over the cross-section of  More>>
Publication Date:
Dec 15, 2006
Product Type:
Technical Report
Report Number:
VARMEFORSK-992
Resource Relation:
Other Information: 139 refs., 54 figs., 15 tabs. Figures and tables with text in English
Subject:
09 BIOMASS FUELS; CORROSION; TEMPERATURE RANGE 0400-1000 K; BOILERS; REFUSE-FUELED BOILERS; BIOFUELS; COMBUSTION; FOULING; DEPOSITION; SUPERHEATERS; FURNACES
OSTI ID:
20869341
Research Organizations:
Vaermeforsk, Stockholm (Sweden)
Country of Origin:
Sweden
Language:
Swedish
Other Identifying Numbers:
Other: Project Vaermeforsk-M06-615; ISSN 1653-1248; TRN: SE0707057
Availability:
Also available from: Vaermeforsk Service AB, SE-101 53 Stockholm, Sweden or http://www.varmeforsk.se; Commercial reproduction prohibited; OSTI as DE20869341
Submitting Site:
SWD
Size:
149 pages
Announcement Date:
May 23, 2007

Citation Formats

Henderson, P, Ifwer, K, Staalenheim, A, Montgomery, M, Hoegberg, J, and Hjoernhede, A. High temperature corrosion in biomass- and waste fired boilers. A status report; Kunskapslaeget betraeffande hoegtemperaturkorrosion i aangpannor foer biobraensle och avfall. Sweden: N. p., 2006. Web.
Henderson, P, Ifwer, K, Staalenheim, A, Montgomery, M, Hoegberg, J, & Hjoernhede, A. High temperature corrosion in biomass- and waste fired boilers. A status report; Kunskapslaeget betraeffande hoegtemperaturkorrosion i aangpannor foer biobraensle och avfall. Sweden.
Henderson, P, Ifwer, K, Staalenheim, A, Montgomery, M, Hoegberg, J, and Hjoernhede, A. 2006. "High temperature corrosion in biomass- and waste fired boilers. A status report; Kunskapslaeget betraeffande hoegtemperaturkorrosion i aangpannor foer biobraensle och avfall." Sweden.
@misc{etde_20869341,
title = {High temperature corrosion in biomass- and waste fired boilers. A status report; Kunskapslaeget betraeffande hoegtemperaturkorrosion i aangpannor foer biobraensle och avfall}
author = {Henderson, P, Ifwer, K, Staalenheim, A, Montgomery, M, Hoegberg, J, and Hjoernhede, A}
abstractNote = {Many biomass- or waste-fired plants have problems with high temperature corrosion on the furnace walls or at the superheaters, especially if the steam temperature is greater than 500 deg C. An increase in the combustion of waste fuels means that an increasing number of boilers have had problems. Therefore, there is great interest from plant owners to reduce the costs associated with high temperature corrosion. At the same time there exists a considerable driving force towards improving the electrical efficiency of a plant by the use of more advanced steam data. The purpose of the work presented here was to answer three main questions: What can be done to reduce high temperature corrosion with current fuel blends and steam temperatures? How can more waste fuels be burnt without an increased risk for corrosion? What needs to be done to reach higher steam temperatures in the future? The level of knowledge of high temperature corrosion in biomass- and waste-fired boilers has been described and summarised. The following measures are recommended to reduce corrosion in existing plant: Make sure that the fuel is well mixed and improve fuel feeding to obtain a more even spread of the fuel over the cross-section of the boiler. Use combustion technology methods to stabilize the oxygen content of the flue gases near the membrane walls and other heat transfer surfaces. Experiment with additives and/or supplementary fuels which contain sulphur in some form, for example peat. Reduce the flue gas temperature at the superheaters. Review soot-blowing procedures or protect heat transfer surfaces from soot blowers. Evaluate coated membrane wall panels in parts of the furnace that experience the worst corrosion. Test more highly alloyed steels suitable for superheaters and when replacing a superheater change to a more highly alloyed steel. For the future, the following should be considered: The role of sulphur needs to be investigated more and other additives should be investigated. Waste products that can reduce fouling and corrosion should be identified. Testing of high-alloyed steels, nickel-base alloys and coatings is needed. Also a better understanding of why some alloys are better than others. New boiler designs with reduced flue gas temperatures near the superheaters. Continue with better mixing of different fuel fractions and improved fuel feeding Improve boiler control to remove the CO peaks. Design superheaters with a larger gap between the loops and use less soot blowing.}
place = {Sweden}
year = {2006}
month = {Dec}
}