Experiences and results on a 0.8MWth oxy-fuel operation pilot-scale circulating fluidized bed

Tan, Yewen; Jia, Lei; Wu, Yinghai; Anthony, Edward J.

doi:10.1016/j.apenergy.2011.11.037

Cited by 110 publications

(57 citation statements)

References 17 publications

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“…It was concluded that the optimum temperature for sulphur retention in oxy-fuel combustion mode in FB reactors was incremented up to ~925 ºC from the 850 ºC normally used at conventional air combustion conditions. This conclusion seems in good agreement with the results found by Canmet Energy working in its CFB combustors [5,9]. However, more work should be carried in continuous fluidised bed reactors to confirm this conclusion.…”

supporting

confidence: 81%

“…However, the same effect was not confirmed working with coals. Recently this group has successfully converted and operated a conventional 0.8 MW th pilot-plant to oxy-fuel firing [5,13]. Their results strongly support the view that this technology offers all of the advantages of air-fired CFB.…”

supporting

confidence: 65%

“…Their results strongly support the view that this technology offers all of the advantages of air-fired CFB. However, the test experiences showed that operating the pilot-scale unit over a long period under oxy-fuel mode led to enhanced corrosion due to higher sulphur concentrations in the flue gas [5]. SO 2 concentration under oxy-fuel mode was up to four times higher compared to air firing mode.…”

mentioning

confidence: 99%

“…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.…”

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

Diego

Rufas

Garcı́a-Labiano

et al. 2013

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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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confidence: 81%

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confidence: 65%

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confidence: 99%

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confidence: 99%

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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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“…Fluidized bed (FB) 48 combustors, and particularly circulating fluidized bed (CFB) combustors, are very 49 promising for the oxy-fuel process because as well as having a great versatility to burn 50 fuels (either fuel-lean or blend of coal with other fuels such as biomass or wastes) they 51 allow the in-situ flue gas desulfurization via Ca-based sorbents added into the 52 combustor, such as limestone or dolomite. This could be an advantage since sulfur 53 containing species mean a risk of corrosion and could have impacts on the furnace, 54 during ash collection, CO 2 compression, transport and storage [5][6]. Currently, the CFB 55 oxy-fuel combustion technology is gaining interest.…”

Section: Introduction 32mentioning

confidence: 99%

Sulfur retention in an oxy-fuel bubbling fluidized bed combustor: Effect of coal rank, type of sorbent and O 2 /CO 2 ratio

Loscertales

Diego

Garcı́a-Labiano

et al. 2014

Fuel

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In this work, SO 2 retention via calcium-based sorbents added in a continuous bubbling 17 fluidized bed combustor (~3 kWth) operating in oxy-fuel combustion mode is analyzed. 18Tests were performed at different operating temperatures with three sorbents, two 19 limestones and one dolomite, and with three coals, ranging from lignite to anthracite, to 20 analyze the influence of coal rank, type of sorbent, sorbent particle size, and O 2 /CO 2 21 feeding ratio on the sulfation process. 22It was found that the combustor temperature had a strong influence on the limestones 23 sulfur retention with a maximum at 900-925 ºC. The behavior of the limestones was 24 qualitatively similar with the three coals, attaining the highest sulfur retention values 25

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The combined effect of H₂O and SO₂ on the simultaneous calcination/sulfation reaction in CFBs

et al. 2019

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The combined effect of H2O and SO2 on the reaction kinetics and pore structure of limestone during simultaneous calcination/sulfation reactions under circulating fluidized bed (CFB) conditions was first studied in a constant‐temperature reactor. H2O can accelerate the sulfation reaction rate in the slow‐sulfation stage significantly but has a smaller effect in the fast‐sulfation stage. H2O can also accelerate the calcination of CaCO3, and should be considered as a catalyst, as the activation energy for the calcination reaction was lower in the presence of H2O. When the limestone particles are calcining, SO2 in the flue gas can react with CaO on the outer particle layer and the resulting CaSO4 blocks the CaO pores, increases the diffusion resistance of CO2, and, in consequence, decreases the calcination rate of CaCO3. Here, gases containing 15% H2O and 0.3% SO2 are shown to increase the calcination rate. This means that the accelerating effect of 15% H2O on CaCO3 decomposition is stronger than the impeding effect caused by 0.3% SO2. The calcination rate of limestone particles was controlled by both the intrinsic reaction and the CO2 diffusion rate in the pores, but the intrinsic reaction rate played a major role as indicated by the effectiveness factors determined in this work. This may explain the synergic effect of H2O and SO2 on CaCO3 decomposition observed here. Finally, the effect of H2O and SO2 on sulfur capture in a 600 MWe CFB boiler burning petroleum coke is also analyzed. The sulfation performance of limestone evaluated by simultaneous calcination/sulfation is shown to be much higher than that by sulfation of CaO. Based on our calculations, a novel use of the wet flue gas recycle method was put forward to improve the sulfur capture performance for high‐sulfur low‐moisture fuels such as petroleum coke. © 2019 American Institute of Chemical Engineers AIChE J, 65: 1256–1268, 2019

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Experiences and results on a 0.8MWth oxy-fuel operation pilot-scale circulating fluidized bed

Cited by 110 publications

References 17 publications

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

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

Sulfur retention in an oxy-fuel bubbling fluidized bed combustor: Effect of coal rank, type of sorbent and O 2 /CO 2 ratio

The combined effect of H₂O and SO₂ on the simultaneous calcination/sulfation reaction in CFBs

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Experiences and results on a 0.8MWth oxy-fuel operation pilot-scale circulating fluidized bed

Cited by 110 publications

References 17 publications

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

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

Sulfur retention in an oxy-fuel bubbling fluidized bed combustor: Effect of coal rank, type of sorbent and O 2 /CO 2 ratio

The combined effect of H2O and SO2 on the simultaneous calcination/sulfation reaction in CFBs

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The combined effect of H₂O and SO₂ on the simultaneous calcination/sulfation reaction in CFBs