Quench-induced nucleation of ash constituents during combustion of pulverized coal in a laboratory furnace

Scotto, Mark V.; Bassham, Eric A.; Wendt, Jost O.L.; Peterson, T.W.

doi:10.1016/s0082-0784(89)80030-x

Cited by 5 publications

(5 citation statements)

References 8 publications

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“…They suggested that the final particle size distributions in the convection section were primarily dictated by the coagulation rate. Scotto et al reported that increasing the quench rate resulted in the enrichment of sodium in the small particles. Gallagher et al examined alkali metal partitioning in ash obtained from pulverized coal combustors and found that increasing temperatures resulted in more vaporization of sodium.…”

Section: Introductionmentioning

confidence: 99%

Submicrometer Particle Formation and Control in a Bench-Scale Pulverized Coal Combustor

Zhuang

Biswas

2001

Energy Fuels

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Experimental studies were performed to investigate the formation mechanisms of submicrometer particles during combustion of a pulverized Ohio bituminous coal. Elemental compositions of total and submicrometer ash and particle size distributions were measured at different operating conditions. The submicrometer ash particles were formed by means of a vaporization-nucleationcondensation mechanism. A decreasing collection efficiency in a cylindrical electrostatic precipitator was observed for ash particles smaller than 100 nm due to insufficient charging. A vaporphase sorbent injection methodology was used in the coal combustion system, and was shown to suppress the nucleation mode of the ash particles.

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Section: Introductionmentioning

confidence: 99%

Submicrometer Particle Formation and Control in a Bench-Scale Pulverized Coal Combustor

Zhuang

Biswas

2001

Energy Fuels

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“…Due to the elements' behaviour in thermal processes, Scotto et al [14] divided dispersed, trace and rare elements into two groups:…”

Section: Resultsmentioning

confidence: 99%

“…The trace elements present in coal have been studied by a number of authors to examine their behaviour at the different temperatures of pyrolysis, gasification and combustion; to determine their affinity for organic and inorganic substances; or to classify them with respect to their volatility or importance to the environment [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Comparison of metal elution from cavern residue after underground coal gasification and from ash obtained during coal combustion

Strugała-Wilczek

Stańczyk

2015

Fuel

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“…Forthesamples collected forEDX-Augeranalysis, 45 mm Hytex0.25/_m silver membranefilters wereplaced on ImpCr impaction substrates. Thesesilver membrane filters were utilized to minimize charging effects when the collected particles were analyzed with an electron beam (Scotto, 1989). In ali cases the a/ter-filters were Flom'ot_re 0.2 t,m filters.…”

Section: -10mentioning

confidence: 99%

“…This combustor (Figure 6.I-I) was designed to simulate the temperaturehistories and complex particle interactionsof practical units, and yet yield a sufficiently weil-characterized flow to allow for the study of fundamentalrates and mechPnisms. It has been in use for some time and is described in several other references (Bassham, 1992;Bose, 1989; Gallagher, 1992;Scotto, 1989). The plug-flow combustor, 6.1 rn (20 ft) long, is a 15.2 cm (6 in.)…”

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confidence: 99%

Transformations of inorganic coal constituents in combustion systems. Volume 2, Sections 6 and 7: Final report

Helble¹,

Srinivasachar²,

Wilemski³

et al. 1992

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In this section of the report, results from an experimental investigation of the mechanisms governing the ash aerosol size segregatedcomposition resulting from the combustion of pulverized coal in a laboratoryscale down-flow combustor are described. The results of modeling activities used to interpret the results of the experiments conducted under this subtask are also described in this section. Although results from the entire program are included, Phase H studies which emphasized: I) alkali behavior, including a study of the interrelationshipbetween potassium vaporization and sodium vaporization; and 2) iron behavior, including an examination of the extent of iron-aluminosilicate interactions, are highlighted. Phase I baseline combustion experiments with the original suite of eight coals (see Section 3 of this report) have been described in detail in the Phase I Final Report (Boni et al., 1990).The University of Arizona (UA) study was conducted in a self-sustained combustion down-flow laboratory furnace. This scale of experimentation was sufficiently large to allow pertinent phenomena in practical situations to be simulated, yet was also sufficiently small to aUow the extraction of information about the relative importance of fundamental vaporization, condensation, and other physico-chemical mechanisms in determining the composition and size of the airborneash. The seven coals examined during Phase I (Beulah Lignite, Eagle Butte, Kentucky #11, Kentucky #9, Upper Freeport, Rlinois and Loy Yang 2301 (Australian)) and the four coals examined during Phase H (Illinois #6 SOAP, Eagle Butte/Kentucky #9 70/30 Blend, Loy Yang 1953, and Kentucky #9 Gravimelt-7A) were burned under overall fuel-lean conditions wi.ththe measured temperaturehistories being those which occurred naturatly under those conditions. Special experiments in which temperature was varied by changing load and/or air preheat were subsequently performed on several coals, to help isolate composition and temperature effects. Selected experiments were also conducted with inorganic additives plus coal to evaluate certain aspects of the ash formation process.In each run, effluent at the exhaust was extractedusing a specially designed isokinetic, aspirateddilution probe. The sample was then passed through an Anderson Impactor and ash samples were collected to representnine particle size cuts ranging from greater than 9 microns to less than0.43 _m. Atomic absorption/emission spectroscopy yielded concentrations of aluminum, silicon, calcium, magnesium, iron, sodium, and potassium for each sample. Data from ali runs consist of: a.Temperature profiles b.Ash composition in each nine size classes c.Total ash loading (as mg ash/sm3 flue gas) in each of nine size classes, and d.For each element, the fraction of the original amount in the coal appearingin each of the nine size classes.Data for eachexperiment is tabulated in Appendix6.D.6-3 I LaboratoryScale Combustor_ments were conducted in a down-flow pulverized coal combustor. The insulated 17 kW (60,000 Btu/h) verti...

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Quench-induced nucleation of ash constituents during combustion of pulverized coal in a laboratory furnace

Cited by 5 publications

References 8 publications

Submicrometer Particle Formation and Control in a Bench-Scale Pulverized Coal Combustor

Submicrometer Particle Formation and Control in a Bench-Scale Pulverized Coal Combustor

Comparison of metal elution from cavern residue after underground coal gasification and from ash obtained during coal combustion

Transformations of inorganic coal constituents in combustion systems. Volume 2, Sections 6 and 7: Final report

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