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Title: Co-combustion of sludge with coal or wood

There are several options for co-combustion of biomass or waste with coal. In all cases the fuel properties are decisive for the success of the arrangement: contents of volatile matter and of potential emission precursors, such as sulphur, nitrogen, chlorine, and heavy metals. The content of alkali in the mineral substance of the fuel is important because of the danger of fouling and corrosion. Research activities at Chalmers University of Technology include several aspects of the related problems areas. An example is given concerning emissions from co-combustion in circulating fluidized beds with coal or wood as base fuels, and with sewage sludge as additional fuel. Two aspects of the properties of sludge are studied: emissions of nitrogen and sulphur oxides as well as of chlorine, because the contents of the precursors to these emissions are high. The possibility of utilizing the phosphorus in sludge as a fertilizer is also discussed. The results show that emissions can be kept below existing emission limits if the fraction of sludge is sufficiently small but the concentration of trace elements in the sludge ash prevents the sludge from being used as a fertilizer. 15 refs., 9 figs., 2 tabs.
Authors:
;  [1]
  1. Chalmers University of Technology, Goeteborg (Sweden). Dept. of Energy Conversion
Publication Date:
OSTI Identifier:
20490071
Resource Type:
Journal Article
Resource Relation:
Journal Name: International Journal of Power and Energy Systems; Journal Volume: 24; Journal Issue: 3; Conference: International conference on co-utilization of domestic fuels, Gainesville, FL (United States), 5-6 Feb 2003; Other Information: energy.conversion@entek.chalmers.se
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 09 BIOMASS FUELS; 60 APPLIED LIFE SCIENCES; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; COCOMBUSTION; COAL; WOOD; FUEL PELLETS; SEWAGE SLUDGE; CIRCULATING SYSTEMS; FLUIDIZED-BED COMBUSTION; FLUIDIZED BED BOILERS; NITROGEN OXIDES; NITRIC OXIDE; NITROUS OXIDE; SULFUR DIOXIDE; CADMIUM; PHOSPHORUS; FERTILIZERS; WASTE PRODUCT UTILIZATION; EMISSION; HYDROCHLORIC ACID