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Sulfur recirculation for increased electricity production in Waste-to-Energy plants.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Andersson, Sven Blomqvist, Evalena W. Bäfver, Linda Jones, Frida Davidsson, Kent Froitzheim, Jan Karlsson, Martin Larsson, Erik Liske, Jesper
Description	Author Affiliation: Andersson S ( Götaverken Miljö AB, Box 8876, SE-402 72 Göteborg, Sweden. Electronic address: sven.andersson@gmab.se.)
Abstract	Sulfur recirculation is a new technology for reducing boiler corrosion and dioxin formation. It was demonstrated in full-scale tests at a Waste to Energy plant in Göteborg (Sweden) during nearly two months of operation. Sulfur was recirculated as sulfuric acid from the flue gas cleaning back to the boiler, thus creating a sulfur loop. The new technology was evaluated by extensive measurement campaigns during operation under normal conditions (reference case) and operation with sulfur recirculation. The chlorine content of both fly ash and boiler ash decreased and the sulfur content increased during the sulfur recirculation tests. The deposit growth and the particle concentration decreased with sulfur recirculation and the dioxin concentration (I-TEQ) of the flue gas was reduced by approximately 25%. Sulfuric acid dew point measurements showed that the sulfuric acid dosage did not lead to elevated SO3 concentrations, which may otherwise induce low temperature corrosion. In the sulfur recirculation corrosion probe exposures, the corrosion rate decreased for all tested materials (16Mo3, Sanicro 28 and Inconel 625) and material temperatures (450 °C and 525 °C) compared to the reference exposure. The corrosion rates were reduced by 60-90%. Sulfur recirculation prevented the formation of transition metal chlorides at the metal/oxide interface, formation of chromate and reduced the presence of zinc in the corrosion products. Furthermore, measured corrosion rates at 525 °C with sulfur recirculation in operation were similar or lower compared to those measured at 450 °C material temperature in reference conditions, which corresponds to normal operation at normal steam temperatures. This implies that sulfur recirculation allows for higher steam data and electricity production without increasing corrosion.
File Format	HTM / HTML
ISSN	0956053X
Issue Number	1
Volume Number	34
e-ISSN	18792456
Journal	Waste Management
Language	English
Publisher	Elsevier
Publisher Date	2014-01-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Research Support, Non-u.s. Gov't Temperature Coal Ash Discipline Environmental Health Dioxins Instrumentation Sulfuric Acids Journal Article Energy-generating Resources Particle Size Chemistry Corrosion Electricity Analysis Refuse Disposal Sulfur Analogs & Derivatives Methods
Content Type	Text
Resource Type	Article
Subject	Waste Management and Disposal

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Effects of gaseous NH(3) and SO(2) on the concentration profiles of PCDD/F in flyash under post-combustion zone conditions.

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Sulfur recirculation for increased electricity production in Waste-to-Energy plants.

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