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Title: Predictive models of circulating fluidized bed combustors: SO[sub 2] sorption in the CFB loop

Abstract

The overall objective of this investigation is to develop experimentally verified models for circulating fluidized bed (CFB) combustors. Sorption of S0[sub 2] with calcined limestone was studied in a PYROFLOW type CFB loop at conditions approximating those found in a CFB combustor. Initially the CFB loop contained 150 micron CaO particles of a density of 3.3 g/cm[sup 3] and air at 1143[degrees]K and 3.25 atm. Atzero time, air containing 600 ppm SO[sub 2], was introduced into the riser bottom at 1143[degrees]K. The effect of gas velocity, sorbent inventory and inlet pressure on the sorption of SO[sub 2], were studied isothermally by running our hydrodynamic code with the S0[sub 2] sorption conservation of species equation. At a velocity of 5m/sec., reported to be a typical velocity by PYROPOWER, there is reasonably good S0[sub 2] removal. At 10 m/sec the S0[sub 2] removal is poor. The best SO[sub 2], removal is for a velocity of 5 m/s and a high bed inventory, initial bed height, H = 9m. Most of the S0[sub 2] is removed in the first two meters of the reactor. However, the S0[sub 2] removal is not complete at the bed outlet. This is due to mixing. At themore » left wall of the reactor (wall opposite the solids inlet) the S0[sub 2] removal was poor due to gas bypassing caused by the asymmetrical solids inlet. Simulation of the PYROPOWER loop with a symmetrical inlet gave us an order of magnitude improvement over the conventional PYROPOWER system. These results demonstrate the practical utility of the predictive model that we have developed over the last three years.« less

Authors:
;  [1]
  1. (Illinois Inst. of Tech., Chicago, IL (United States). Dept. of Chemical Engineering)
Publication Date:
Research Org.:
Illinois Inst. of Tech., Chicago, IL (United States). Dept. of Chemical Engineering
Sponsoring Org.:
DOE; USDOE, Washington, DC (United States)
OSTI Identifier:
6648155
Alternate Identifier(s):
OSTI ID: 6648155; Legacy ID: DE93012467
Report Number(s):
DOE/PC/89769-T13
ON: DE93012467
DOE Contract Number:  
FG22-89PC89769
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; FLUIDIZED-BED COMBUSTORS; MATHEMATICAL MODELS; LIMESTONE; SORPTIVE PROPERTIES; SULFUR DIOXIDE; SORPTION; EXPERIMENTAL DATA; PROGRESS REPORT; REMOVAL; CARBONATE ROCKS; CHALCOGENIDES; COMBUSTORS; DATA; DOCUMENT TYPES; INFORMATION; NUMERICAL DATA; OXIDES; OXYGEN COMPOUNDS; ROCKS; SEDIMENTARY ROCKS; SULFUR COMPOUNDS; SULFUR OXIDES; SURFACE PROPERTIES 014000* -- Coal, Lignite, & Peat-- Combustion; 010800 -- Coal, Lignite, & Peat-- Waste Management; 990200 -- Mathematics & Computers

Citation Formats

Gidaspow, D., and Therdthianwong, A. Predictive models of circulating fluidized bed combustors: SO[sub 2] sorption in the CFB loop. United States: N. p., 1993. Web. doi:10.2172/6648155.
Gidaspow, D., & Therdthianwong, A. Predictive models of circulating fluidized bed combustors: SO[sub 2] sorption in the CFB loop. United States. doi:10.2172/6648155.
Gidaspow, D., and Therdthianwong, A. Mon . "Predictive models of circulating fluidized bed combustors: SO[sub 2] sorption in the CFB loop". United States. doi:10.2172/6648155. https://www.osti.gov/servlets/purl/6648155.
@article{osti_6648155,
title = {Predictive models of circulating fluidized bed combustors: SO[sub 2] sorption in the CFB loop},
author = {Gidaspow, D. and Therdthianwong, A.},
abstractNote = {The overall objective of this investigation is to develop experimentally verified models for circulating fluidized bed (CFB) combustors. Sorption of S0[sub 2] with calcined limestone was studied in a PYROFLOW type CFB loop at conditions approximating those found in a CFB combustor. Initially the CFB loop contained 150 micron CaO particles of a density of 3.3 g/cm[sup 3] and air at 1143[degrees]K and 3.25 atm. Atzero time, air containing 600 ppm SO[sub 2], was introduced into the riser bottom at 1143[degrees]K. The effect of gas velocity, sorbent inventory and inlet pressure on the sorption of SO[sub 2], were studied isothermally by running our hydrodynamic code with the S0[sub 2] sorption conservation of species equation. At a velocity of 5m/sec., reported to be a typical velocity by PYROPOWER, there is reasonably good S0[sub 2] removal. At 10 m/sec the S0[sub 2] removal is poor. The best SO[sub 2], removal is for a velocity of 5 m/s and a high bed inventory, initial bed height, H = 9m. Most of the S0[sub 2] is removed in the first two meters of the reactor. However, the S0[sub 2] removal is not complete at the bed outlet. This is due to mixing. At the left wall of the reactor (wall opposite the solids inlet) the S0[sub 2] removal was poor due to gas bypassing caused by the asymmetrical solids inlet. Simulation of the PYROPOWER loop with a symmetrical inlet gave us an order of magnitude improvement over the conventional PYROPOWER system. These results demonstrate the practical utility of the predictive model that we have developed over the last three years.},
doi = {10.2172/6648155},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1993},
month = {2}
}