Abstract
Modeling of particle size distribution of limestone in sulfur capture in air and oxy-fuel circulating fluidized bed combustion Jaakko Saastamoinen,1 Antti Tourunen,2 Timo Leino,1 Toni Pikkarainen,1 1VTT Technical Research Centre of Finland Ltd, Jyväskylä, 2Reteres Oy, Äijälä, Finland Abstract: Measurements for partition of Ca-containing compounds in particles in air and oxy-fuel combustion are presented. A model for steady and unsteady state particle size distribution (PSD) of limestone including the effects of PSD of the feed, attrition, fly ash, and bottom ash removal is presented. By incorporating models for sulfation, a new model for distribution of Ca-containing compounds CaCO3, CaO, and CaSO4 in different particle sizes during sulfation is found. The model can be applied to study the effects of different factors on the PSD of limestone in the bed, to optimize the PSD in the bed, and to study reasons for the measured PSDs and distributions of Ca-containing compounds in different size fractions in the bed in sulfur capture in circulating fluidized bed combustion in air and oxy-fuel conditions. Keywords: limestone, sulfur capture, circulating fluidized bed, population balance modeling, oxy-fuel
Highlights
The particle size distribution (PSD) is an important factor affecting the fluidization, heat transfer, combustion, and sulfur capture in fluidized bed combustion (FBC) and circulating fluidized bed combustion (CFBC)
Population balance modeling has been applied in simulating PSD of char,[2,3,4,5,6,7,8,9,10,11,12,13,14,15,16] limestone,[17,18,19,20,21,22,23,24,25] ash in different solids or ash[26,27,28,29,30,31,32,33,34,35,36,37] in FBC and CFBC and in other fluidized bed processes[38,39] and gasification.[40,41,42]
This paper presents a new model for the calculation of the steady and unsteady state PSDs of limestone and distribution of different Ca-containing compounds in the PSD
Summary
The particle size distribution (PSD) is an important factor affecting the fluidization, heat transfer, combustion, and sulfur capture in fluidized bed combustion (FBC) and circulating fluidized bed combustion (CFBC). Population balance modeling has been applied in simulating PSD of char,[2,3,4,5,6,7,8,9,10,11,12,13,14,15,16] limestone,[17,18,19,20,21,22,23,24,25] ash in different solids or ash[26,27,28,29,30,31,32,33,34,35,36,37] in FBC and CFBC and in other fluidized bed processes[38,39] and gasification.[40,41,42] The burn-off instead of particle size as the distributed variable has been used.[43] Most of the models are steady state, but dynamic evolution of the PSD has been modeled.[14,23,34,44,45] Coupling of PSDs and reactions described by shrinking core model have been discussed.[46,47] The cyclone characteristics affect the PSD of the elutriated particles, which are returned to the reactor.
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