Corrosion in recycled wood combustion - theory and solutions

A3 Bokavsnitt, kapitel i forskningsböcker


Interna författare/redaktörer


Publikationens författare: Hanna Kinnunen, Sonja Enestam, Patrik Yrjas
Redaktörer: Stephanie Thiel, Elisabeth Thomé-Kozmiensky, Franz Winter, and Dagmar Juchelková
Publiceringsår: 2019
Förläggare: Thomé-Kozmiensky Verlag GmbH
Moderpublikationens namn: Waste-to-Energy
Seriens namn: Waste Management
Volym: 9
ISBN: 978-3-944310-48-0


Abstrakt

The use of
waste-derived fuels, such as recycled wood, is a good and sustainable way to
produce heat and electricity, minimize the use of fossil fuels and increase the
use of renewable energy. Besides, waste-based fuels are relatively cheap and
widely available. However, this trend is not totally trouble-free because of
alkali metals, heavy metals, and chlorine, which waste-based fuels typically
contain in higher shares than coal and oil. These-ash forming elements increase
the tendency of high-temperature corrosion and fouling of heat transfer
surfaces. In recycled wood firing, alkali chlorides are present in combination
with heavy metals, and the corrosion starting temperature may be considerably
lower than with virgin wood combustion. In practice, this means that corrosion
issues might be present in furnace walls, low-temperature superheaters, and
economizers.


In boiler design, the
key parameter is the composition of the fuel or fuel mixture. This specifies
the final steam temperature, the layout of the boiler and material solutions. Understanding
the corrosion phenomena enables the most cost-effective boiler design and
material selection. Several
studies have been made and a more detailed understanding has been gained during
the recent years when combating high-temperature corrosion issues related to
recycled wood combustion and heavy metal induced corrosion. The main findings
are summarized in this article and some solutions to minimize unscheduled
boiler shutdowns and to maximize boiler capacity, are presented.


Nyckelord

high-temperature corrosion, Waste combustion

Senast uppdaterad 2020-01-04 vid 05:40