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09168 High Temperature Corrosion Under Simulated Biomass Deposit Conditions

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Product Number: 51300-09168-SG
ISBN: 09168 2009 CP
Author: Peter Viklund, Jesper Flyg and Rachel F. A. Pettersson
Publication Date: 2009
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Biomass is gaining increasing importance as a renewable energy source for the production of heat, electricity and transport fuels. However, corrosion issues are numerous and include accelerated wastage under ash and alkali salt deposits, erosion, and metal dusting in conjunction with gasification.

This work focuses on deposit issues and is based on laboratory exposures for a total of 960 hours at 550ºC (1022ºF) and 700ºC (1292ºF) under deposits of 52.4 wt% KCl + 47.6 wt% K2SO4 in a nitrogenbased gaseous atmosphere containing 15% H2O, 5%O2, 13%CO2 and 0.02%HCl.

The materials tested include carbon steel, low alloyed steels with 2%Cr or 9%Cr, the austenitic AISI 304 and the high temperature grade 253MA (21%Cr, 11%Ni, 1.6%Si, Ce). Metal loss data obtained from metallographic evaluation show the corrosion rate to decrease in this order and illustrate how materials substitution can permit an increase in process temperature. Examination of the reaction interface underlines the importance of both chlorination and oxidation in the materials corrosion process.
Biomass is gaining increasing importance as a renewable energy source for the production of heat, electricity and transport fuels. However, corrosion issues are numerous and include accelerated wastage under ash and alkali salt deposits, erosion, and metal dusting in conjunction with gasification.

This work focuses on deposit issues and is based on laboratory exposures for a total of 960 hours at 550ºC (1022ºF) and 700ºC (1292ºF) under deposits of 52.4 wt% KCl + 47.6 wt% K2SO4 in a nitrogenbased gaseous atmosphere containing 15% H2O, 5%O2, 13%CO2 and 0.02%HCl.

The materials tested include carbon steel, low alloyed steels with 2%Cr or 9%Cr, the austenitic AISI 304 and the high temperature grade 253MA (21%Cr, 11%Ni, 1.6%Si, Ce). Metal loss data obtained from metallographic evaluation show the corrosion rate to decrease in this order and illustrate how materials substitution can permit an increase in process temperature. Examination of the reaction interface underlines the importance of both chlorination and oxidation in the materials corrosion process.
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Our laboratory has investigated the causes of degradation of structural components of these gasifiers. In all cases, the likely causes of degradation have been determined and alternate materials identified.
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