Devolatilization and ash comminution of two different sewage sludges under fluidized bed combustion conditions

Two different wet sewage sludges have been characterized under fluidized bed combustion conditions with reference to their devolatilization behavior and ash comminution with the aid of different and complementary experimental protocols. Analysis of the devolatilization process allowed to determine the size of fuel particle able to achieve effective lateral spreading of the volatile matter across the cross-section of medium-scale combustors. Primary fragmentation and primary ash particle characterization pointed out the formation of a significant amount of relatively large fragments. The mechanical properties of these fragments have been characterized by means of elutriation/abrasion tests using both quartz and sludge ash beds.

[1]  R. D. Nauze,et al.  A review of the fluidised bed combustion of biomass , 1987 .

[2]  J. Lighty,et al.  Biosludge incineration in FBCs: Behavior of ash particles , 1995 .

[3]  J. F. Mullen,et al.  Consider Fluid-Bed Incineration for Hazardous Waste Destruction , 1992 .

[4]  P. Salatino,et al.  Attrition phenomena during fluidized bed combustion of granulated and mechanically dewatered sewage sludges , 2005 .

[5]  J. Werther,et al.  Sewage sludge combustion , 1999 .

[6]  M. Pohořelý,et al.  Behaviour of inorganic constituents of municipal sewage sludge during fluidized-bed combustion , 2007 .

[7]  G. Gordon,et al.  Atmospheric emissions of elements on particles from the Parkway sewage-sludge incinerator , 1981 .

[8]  J. S. Dennis,et al.  The devolatilisation of particles of a complex fuel (dried sewage sludge) in a fluidised bed , 2007 .

[9]  D. T. Liang,et al.  Agglomeration Characteristics of Sludge Combustion in a Bench-Scale Fluidized Bed Combustor , 2007 .

[10]  I. Gulyurtlu,et al.  Control of Pollutants during FBC Combustion of Sewage Sludge , 2004 .

[11]  Jan Baeyens,et al.  Investigation of operational parameters for an industrial CFB combustor of coal, biomass and sludge , 2007 .

[12]  J. Werther,et al.  NOx and N2O emission characteristics from fluidised bed combustion of semi-dried municipal sewage sludge , 2001 .

[13]  U. Tapper,et al.  Ultrafine ash particle formation during waste sludge incineration in fluidized bed reactors , 1998 .

[14]  J. Werther,et al.  Experimental investigation and modeling of gasification of sewage sludge in the circulating fluidized bed , 2005 .

[15]  Tadaaki Shimizu,et al.  Emissions of NOx and N2O during co-combustion of dried sewage sludge with coal in a bubbling fluidized bed combustor , 2007 .

[16]  E. Anthony.  Fluidized bed combustion of alternative solid fuels ; status, successes and problems of the technology , 1995 .

[17]  F. Scala,et al.  Fluidized bed combustion of alternative solid fuels , 2004 .

[18]  C. K. Jotshi,et al.  Fluidized-bed incineration of waste materials , 1994 .

[19]  Joachim Werther,et al.  Gaseous emissions from co-combustion of sewage sludge and coal/wood in a fluidized bed , 2004 .

[20]  Jean Vaxelaire,et al.  Transient mathematical modelling of a fluidized bed incinerator for sewage sludge , 2008 .

[21]  K. Svoboda,et al.  Combustion of Dried Sewage Sludge in a Fluidized-Bed Reactor , 2005 .

[22]  J Baeyens,et al.  The distribution of heavy metals during fluidized bed combustion of sludge (FBSC). , 2008, Journal of hazardous materials.

[23]  D. T. Liang,et al.  Emission Characteristics of Heavy Metals and Organic Pollutants from the Combustion of Sewage Sludge in a Fluidized Bed Combustor , 2008 .

[24]  Henrik Thunman,et al.  Estimation of Solids Mixing in a Fluidized-Bed Combustor , 2002 .

[25]  P. Salatino,et al.  Fluidized bed combustion of pelletized biomass and waste-derived fuels , 2008 .

[26]  J. Wendt,et al.  A study of fine particulate emissions from combustion of treated pulverized municipal sewage sludge. , 2002, Environmental science & technology.

[27]  Joachim Werther,et al.  Combustion characteristics of wet sludge in a fluidized bed: Release and combustion of the volatiles , 1996 .

[28]  N Lapa,et al.  The behaviour of ashes and heavy metals during the co-combustion of sewage sludges in a fluidised bed. , 2003, Waste management.