Characterization of Ash-Forming Matter in Various Solid Fuels by Selective Leaching and Its Implications for Fluidized-Bed Combustion

2012 ◽  
Vol 26 (10) ◽  
pp. 6366-6386 ◽  
Author(s):  
Maria Zevenhoven ◽  
Patrik Yrjas ◽  
Bengt-Johan Skrifvars ◽  
Mikko Hupa
Keyword(s):  
Fluidized Bed ◽  
Solid Fuels ◽  
Selective Leaching ◽  
Fluidized Bed Combustion

A Novel Technique for “In-Situ” Characterization of Devolatilization Rate of Solid Fuels in Fluidized Beds

2005 ◽  
Author(s):  
R. Solimene ◽  
R. Chirone ◽  
A. Marzocchella ◽  
P. Salatino
Keyword(s):  
Fluidized Bed ◽  
Fluidized Beds ◽  
Volatile Matter ◽  
Solid Fuels ◽  
In Situ Characterization ◽  
Flow Restriction ◽  
History Of ◽  
Fuel Particles

The characterization of volatile matter (VM) emission from solid fuel particles during fluidized bed combustion/gasification is relevant to reactor performance influencing the fate of VM as it results from competing phenomena of release, mixing/segregation and burn-out. The rate and the time-history of volatile matter release strongly affect axial segregation of fuel particles in the bed, favoring the establishment of the stratified combustion regime. On the other hand, the comparison between the devolatilization and radial solids mixing time scales affects the radial distribution of volatile matter across the reactor. Short devolatilization times determine VM release localized near feeding point. The knowledge of devolatilization kinetics, as determined by thermogravimetric analysis, does not take into account key process phenomena such as the effective time-temperature history of the devolatilizing particle. A novel and easy-to-use diagnostic technique for “in-situ” characterization of the devolatilization rate of fuel particles in gas fluidized beds is proposed in the present paper. It is based on the time-resolved measurement of pressure in a bench scale fluidized bed reactor equipped with a calibrated flow restriction at the exhaust. The procedure consists of the injection of a single fuel particle (or small batches of multiple particles) and continuous monitoring of the pressure in the reactor. The bed was kept at a constant temperature by external heating and fluidized with nitrogen. Gas pressure inside the reactor increases during devolatilization as a consequence of the increased flow rate, due to the emission of volatile matter, across the calibrated flow restriction at the exhaust. Experimental data are analyzed in the light of a model of the experiment based on the transient mass balance on the reactor volume referred to the fluidizing gas and to the volatile matter. The comparison between experimental pressure time series and model computations enables the characterization of the kinetic parameters of devolatilization rate for samples of different coals as well as of non-fossil solid fuels.

Fine and Ultrafine Particles Generated During Fluidized Bed Combustion of Different Solid Fuels

2008 ◽  
Vol 25 (10) ◽  
pp. 1399-1406 ◽  
Author(s):  
Massimo Urciuolo ◽  
Alberto Barone ◽  
Antonio D'Alessio ◽  
Riccardo Chirone
Keyword(s):  
Fluidized Bed ◽  
Ultrafine Particles ◽  
Solid Fuels ◽  
Fluidized Bed Combustion

Environmental Friendly Fluidized Bed Combustion of Solid Fuels: A Review About Local Scale Modeling of Char Heterogeneous Combustion

2015 ◽  
Vol 7 (2) ◽  
pp. 237-266 ◽  
Author(s):  
Germán D. Mazza ◽  
José M. Soria ◽  
Daniel Gauthier ◽  
Andrés Reyes Urrutia ◽  
Mariana Zambon ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Local Scale ◽  
Solid Fuels ◽  
Heterogeneous Combustion ◽  
Fluidized Bed Combustion ◽  
Scale Modeling ◽  
Environmental Friendly ◽  
Combustion Of Solid Fuels

scholarly journals Characterization of solid wastes from circulating fluidized bed combustion

1989 ◽  
Author(s):  
E J Anthony ◽  
G G Ross ◽  
E E Berry ◽  
R T Hemings ◽  
R K Kissel ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Solid Wastes ◽  
Fluidized Bed Combustion ◽  
Circulating Fluidized Bed Combustion
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