Investigation on Ash Slagging Characteristics During Combustion of Biomass Pellets and Effect of Additives

This study reports a systematic investigation into ash slagging behavior during combustion of barley straw and barley husk pellets with or without additives in a residential pellet burner. The slagging tendencies of the pellets were evaluated based on the amount, chemistry, mineralogy, and morphology of inlet ash formed as slag and sintering degrees of residual ash. The barley straw and husk pellets showed high slagging tendencies with 39 and 54 wt % ingoing ash formed as slag. Analyses using X-ray fluorescence and scanning electron microcopy combined with energy-dispersive X-ray spectroscopy revealed high concentrations of K, Si, and Ca but a minor amount of P in barley straw slag. The slag mainly contained melted potassium silicates directly observed by X-ray diffraction. For the barley husk, high ash slagging tendency was observed and mainly attributed to the formation and melting of potassium phosphates, potassium silicates, and complex mixtures of the two mineral phases. Addition of marble sludge com...

[1]  Hailong Li,et al.  Investigation of rye straw ash sintering characteristics and the effect of additives , 2016 .

[2]  Haiping Yang,et al.  Effects of binders on the properties of bio-char pellets , 2015 .

[3]  Wei Hsin Chen,et al.  A state-of-the-art review of biomass torrefaction, densification and applications , 2015 .

[4]  M. Öhman,et al.  Slagging in fixed-bed combustion of phosphorus-poor biomass : critical ash-forming processes and compositions , 2015 .

[5]  Liang Wang,et al.  Investigation of additives for preventing ash fouling and sintering during barley straw combustion , 2014 .

[6]  M. Öhman,et al.  Combustion of Biosolids in a Bubbling Fluidized Bed, Part 1: Main Ash-Forming Elements and Ash Distribution with a Focus on Phosphorus , 2014, Energy & fuels : an American Chemical Society journal.

[7]  Liang Wang,et al.  Investigation of Biomass Ash Sintering Characteristics and the Effect of Additives , 2014 .

[8]  Magnus Ståhl,et al.  The effects of kraft lignin additives on wood fuel pellet quality, energy use and shelf life , 2013 .

[9]  M. Hupa,et al.  Characterization of Ash-Forming Matter in Various Solid Fuels by Selective Leaching and Its Implications for Fluidized-Bed Combustion , 2012 .

[10]  Liang Wang,et al.  Sintering Behavior of Agricultural Residues Ashes and Effects of Additives , 2012 .

[11]  M. Öhman,et al.  Fluidized-Bed Combustion of Mixtures of Rapeseed Cake and Bark: The Resulting Bed Agglomeration Characteristics , 2012 .

[12]  Christoffer Boman,et al.  Ash Transformation Chemistry during Combustion of Biomass , 2012 .

[13]  M. Hupa.  Ash-Related Issues in Fluidized-Bed Combustion of Biomasses: Recent Research Highlights , 2012 .

[14]  Liang Wang,et al.  Effects of Sewage Sludge and Marble Sludge Addition on Slag Characteristics during Wood Waste Pellets Combustion , 2011 .

[15]  P. Glarborg,et al.  Release and Transformation of Inorganic Elements in Combustion of a High-Phosphorus Fuel , 2011 .

[16]  Yanqing Niu,et al.  Study on fusion characteristics of biomass ash. , 2010, Bioresource technology.

[17]  Dan Boström,et al.  Slagging Characteristics during Combustion of Woody Biomass Pellets Made from a Range of Different Forestry Assortments , 2010 .

[18]  M. Wilewska-Bien,et al.  Investigation of Ash Sintering during Combustion of Agricultural Residues and the Effect of Additives , 2009 .

[19]  M. Öhman,et al.  Influence of Kaolin and Calcite Additives on Ash Transformations in Small-Scale Combustion of Oat , 2009 .

[20]  P. A. Jensen,et al.  Release of Potassium from the Systems K-Ca-Si and K-Ca-P , 2009 .

[21]  Lars-Erik Åmand,et al.  Application of chemical fractionation methods for characterisation of biofuels, waste derived fuels and CFB co-combustion fly ashes , 2008 .

[22]  Dan Boström,et al.  Slagging characteristics during residential combustion of biomass pellets , 2008 .

[23]  Dan Boström,et al.  Slagging Characteristics during Combustion of Corn Stovers with and without Kaolin and Calcite , 2008 .

[24]  M. Öhman,et al.  Slagging Characteristics during Combustion of Cereal Grains Rich in Phosphorus , 2007 .

[25]  Anders Nordin,et al.  Effect of kaolin and limestone addition on slag formation during combustion of wood fuels , 2004 .

[26]  Peter Arendt Jensen,et al.  Transformation and Release to the Gas Phase of Cl, K, and S during Combustion of Annual Biomass , 2004 .

[27]  P. Thy,et al.  High-Temperature Melting Behavior of Urban Wood Fuel Ash , 1999 .

[28]  P. Chartrand,et al.  Towards a comprehensive thermodynamic database for ash-forming elements in biomass and waste combustion — Current situation and future developments , 2013 .

[29]  Joakim Myung Johansen,et al.  Release of K, Cl, and S during combustion and co-combustion with wood of high-chlorine biomass in bench and pilot scale fuel beds , 2013 .

[30]  Liang Wang,et al.  A Critical Review on Additives to Reduce Ash Related Operation Problems in Biomass Combustion Applications , 2012 .

[31]  Liang Wang,et al.  Effects of Additives on Barley Straw and Husk Ashes Sintering Characteristics , 2012 .