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HIGH TEMPERATURE CORROSION AND DIOXIN ABATEMENT USING SULFUR RECIRCULATION IN A WASTE-TO-ENERGY PLANT

  • Sven Andersson - Babcock&Wilcox Vølund AB, Sweden - Environmental Inorganic Chemistry, Chalmers tekniska hogskola Institutionen for kemi- och bioteknik, Sweden
  • Maria Dolores Paz - Environmental Inorganic Chemistry, Chalmers tekniska hogskola Institutionen for kemi- och bioteknik, Sweden
  • Julien Phother-Simon - Environmental Inorganic Chemistry, Chalmers tekniska hogskola Institutionen for kemi- och bioteknik, Sweden
  • Torbjörn Jonsson - Environmental Inorganic Chemistry, Chalmers tekniska hogskola Institutionen for kemi- och bioteknik, Sweden

DOI 10.31025/2611-4135/2019.13784

Released under CC BY-NC-ND

Copyright: © 2018 CISA Publisher

Abstract

Sulfur Recirculation is a novel technique for reducing the high temperature corrosion and dioxin formation in Waste-to-Energy plants by recirculating sulfur from the wet flue gas cleaning back to the boiler. This is achieved by separating SO2 from the flue gas in a wet scrubber downstream of a HCl scrubber. H2O2 dosed into the scrubber reacts with SO2 in the gas and produces a 15-25wt% H2SO4 solution, which is injected into the boiler producing SO2, thus creating a sulfur loop. The first permanent full-scale installation has been in operation in one of the two commercial full-scale Waste-to Energy boilers at Maabjerg Energy Center (MEC) in Denmark since October 2016. The recirculated sulfur increased the gas concentration of SO2 by a factor of 2-3 in the boiler, thereby enhancing the sulfation of corrosive alkali chlorides to non-corrosive alkali sulfates. The chlorine content of the superheater deposits decreased by 85%, and the super¬heater corrosion rate decreased by 40-90% during the first year of operation. The dioxin concentrations upstream of the dioxin removal system decreased by 75% and the dioxin emissions decreased by 72% with Sulfur Recirculation in operation. Furthermore, the sulfate containing effluent water was almost eliminated due to the increased sulfation of the ashes and deposits.

Keywords

Editorial History

  • Received: 30 Nov 2018
  • Revised: 31 Jan 2019
  • Accepted: 20 Feb 2019
  • Available online: 31 Mar 2019

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