Experimental Study of Oxy-Fuel Combustion and Sulfur Capture in a Mini-CFBC

Jia, Lei; Tan, Yewen; Wang, C.; Anthony, Edward J.

doi:10.1021/ef7002359

Cited by 126 publications

(80 citation statements)

References 7 publications

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“…1). Sulfur capture proceeds in this case via direct sulfation of the raw limestone, as experimentally confirmed by the mini-CFB combustion test results reported by Jia et al [13]. The lower sulfation rate associated with direct sulfation of limestone [15] in this second option may not represent an issue as, due to constraints associated with the establishment of optimal bed solids inventories, sorbent particles usually experience residence times in CFB combustors that may well exceed the sulfation time scales.…”

Section: Introductionsupporting

confidence: 61%

“…The lower sulfation rate associated with direct sulfation of limestone [15] in this second option may not represent an issue as, due to constraints associated with the establishment of optimal bed solids inventories, sorbent particles usually experience residence times in CFB combustors that may well exceed the sulfation time scales. In this respect, contradictory data have appeared in the literature [13,14] indicating the need for further studies to clarify this point.…”

Section: Introductionmentioning

confidence: 99%

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Limestone Attrition under Simulated Oxyfiring Fluidized‐Bed Combustion Conditions

Scala

Salatino

2009

Chem Eng & Technol

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Limestone attrition by surface wear was studied during the flue gas desulfurization under simulated fluidized-bed (FB) oxyfiring conditions and hindered calcination. Bench-scale experimental tests were carried out using well-established techniques previously developed for the characterization of sulfation and attrition of sorbents in air-blown atmospheric FB combustors. The experimental limestone conversion and attrition results were compared with those previously obtained with the same limestone under simulated air-blown combustion conditions. The differences in the conversion and attrition extents and patterns associated with oxyfiring as compared to air-blown atmospheric combustion were highlighted and related to the different particle morphologies and thicknesses of the sulfate layer. It was noted that attrition could play an important role in practical circulating FB combustor operation, by effectively enhancing particle sulfation under both oxyfiring and air-blown combustion conditions

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Section: Introductionsupporting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Limestone Attrition under Simulated Oxyfiring Fluidized‐Bed Combustion Conditions

Scala

Salatino

2009

Chem Eng & Technol

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“…Alstom [10], VTT and Foster Wheeler [11], Metso [12], Czestochowa University of Technology [7], and Canmet Energy [5,8,9,13] have experimented in oxyfuel combustion with CFB combustors at scales up to 4 MW th . The Fundación Ciuden [14] in Spain is developing two plants able to operate from conventional air combustion to oxy-fuel combustion.…”

mentioning

confidence: 99%

“…One is a 20 MW th PC boiler and the other is a CFB combustor of 15 MW th operating in air-mode and 30 MW th operating in oxy-mode. The research group of Canmet Energy [8][9] is involved in testing a CFB combustor of 100 kW th with flue gas recycle. Operating at ~850 ºC, they found lower sulphation in oxy-fuel combustion than in air combustion conditions, but the sulphation improved working with a petroleum coke by increasing the operation temperature, that is, changing from direct to indirect sulphation.…”

mentioning

confidence: 99%

Optimum temperature for sulphur retention in fluidised beds working under oxy-fuel combustion conditions

Diego

Rufas

Garcı́a-Labiano

et al. 2013

Fuel

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Oxy-fuel combustion is one of the leading options for power generation with CO 2 capture. The process consists of burning the fuel with a mixture of nearly pure oxygen and a CO 2 -rich recycled flue gas, resulting in a product flue gas from the boiler containing mainly CO 2 and H 2 O. Among the possible boiler types, fluidised bed combustors are very appropriate for the oxy-fuel process because they allow the in-situ desulphurisation by feeding Ca-based sorbents into the combustor.In this work, the effect of the temperature of the combustor on the retention of the SO 2 generated in the combustion of two coals with very different sulphur content (a lignite and an anthracite) has been studied. The experimental facility used was a bubbling fluidised bed (BFB) combustor of ~3 kW th . Tests were conducted under oxy-fuel combustion mode and also under enriched-air combustion mode for comparison reasons. A Spanish limestone "Granicarb" was used as Ca-based sorbent for sulphur retention. The temperatures tested were between 800 and 970 ºC using Ca/S molar ratios between 0 and 3.It was found that in BFB combustors operating under oxy-fuel combustion conditions the optimum temperature to achieve the highest sulphur retention was 900-925 ºC, whereas operating with enriched air the optimum combustion temperature was ºC. Working at the optimum temperature, the SO 2 retentions were lower in oxy-fuel 2 combustion than in enriched air combustion conditions. It was also observed that working with lignite there was 10-15% of sulphur retention by coal ashes, however, working with anthracite the sulphur retention by coal ashes was negligible. This finding was independent of the combustion mode used, oxy-fuel or enriched air.

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“…For example, the effluent CO 2 stream from oxyfuel combustion from a fluidized bed pilot plant combustor (CanmetENERGY, Ottawa, Ontario, Canada) contained gas impurities that included 5.2 vol% O 2 , 221 ppm CO, 1431 ppm SO 2 , and 243 ppm NO (Jia et al 2007). The expected CO 2 stream from an oxyfuel combustion plant includes 5.8 vol% N 2 , 4.7 vol% O 2 , 4.47 vol% Ar, 100 ppm NO x , 50 ppm SO 2 , 20 ppm SO 3 , and 50 ppm CO (IEAGHG 2004).…”

Section: Introductionmentioning

confidence: 99%

FY12 ARRA-NRAP Report ? Studies to Support Risk Assessment of Geologic Carbon Sequestration

Cantrell¹,

Shao²,

Thompson³

et al. 2011

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SummaryThis report summarizes results of research conducted during FY 2012 to support the assessment of environmental risks associated with geologic carbon dioxide (CO 2 ) sequestration and storage. Several research focus areas are ongoing as part of this project. This includes the quantification of the leachability of metals and organic compounds from representative CO 2 storage reservoir and caprock materials, the fate of metals and organic compounds after release, and the development of a method to measure pH in situ under supercritical CO 2 (scCO 2 ) conditions.Metal leachability experiments were completed on six different rock samples in brine in equilibrium with scCO 2 at representative geologic reservoir conditions. In general, the leaching of Resource Conservation and Recovery Act of 1976 metals and other metals of concern was found to be limited and not likely to be a significant issue (at least, for the rocks tested). Metals leaching experiments were also completed on one rock sample with scCO 2 containing oxygen at concentrations of 0%, 1%, 4%, and 8% to simulate injection of CO 2 originating from the oxy-fuel combustion process. Significant differences in the leaching behavior of certain metals were observed when oxygen is present in the CO 2 . These differences resulted from oxidation of sulfides, release of sulfate, ferric iron and other metals, and subsequent precipitation of iron oxides and some sulfates such as barite.Experiments to evaluate the potential for mobilization of organic compounds from representative reservoir materials and cap rock and their fate in porous media (quartz sand) have been conducted. Results with Fruitland coal and Gothic shale indicate that lighter organic compounds were more susceptible to mobilization by scCO 2 compared to heavier compounds. Alkanes demonstrated very low extractability by scCO 2 . No significant differences were observed between the extractability of organic compounds by dry or water saturated scCO 2 . Reaction equilibrium appears to have been reached by 96 hours.When the scCO 2 was released from the reactor, less than 60% of the injected lighter compounds (benzene, toluene) were transported through the dry sand column by the CO 2 , while more than 90% of the heavier organics were trapped in the sand column. For wet sand columns, most (80% to 100%) of the organic compounds injected into the sand column passed through, except for naphthalene which was substantially removed from the CO 2 within the column.A spectrophotometric method was developed to measure pH in brines in contact with scCO 2 . This method provides an alternative to fragile glass pH electrodes and thermodynamic modeling approaches for estimating pH. The method was tested in simulated reservoir fluids (CO 2 -NaCl-H 2 O) at different temperatures, pressures, and ionic strengths, and the results were compared with other experimental studies and geochemical models. Measured pH values were generally in agreement with the models, but inconsistencies were present between some of the models.v

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Experimental Study of Oxy-Fuel Combustion and Sulfur Capture in a Mini-CFBC

Cited by 126 publications

References 7 publications

Limestone Attrition under Simulated Oxyfiring Fluidized‐Bed Combustion Conditions

Limestone Attrition under Simulated Oxyfiring Fluidized‐Bed Combustion Conditions

Optimum temperature for sulphur retention in fluidised beds working under oxy-fuel combustion conditions

FY12 ARRA-NRAP Report ? Studies to Support Risk Assessment of Geologic Carbon Sequestration

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