Direct desulfurization of limestones under oxy-circulating fluidized bed combustion conditions

Kim, Ye Bin; Gwak, You Ra; Keel, Sang In; Yun, Jin Han; Lee, See Hoon

doi:10.1016/j.cej.2018.08.036

Cited by 35 publications

(14 citation statements)

References 27 publications

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“…The two different sulfurization routes, indirect and direct, are mainly determined by the CO2 partial pressure and the combustion temperature [24][25]. It has been proved…”

Section: Caco Cao+co mentioning

confidence: 99%

“…that the higher CO2 concentration in the flue gas of oxy-fuel combustion could lead to the transition from indirect sulfurization to direct sulfurization, reducing the reaction rate as well as desulfurization efficiency dramatically [26][27][28]. According to the equilibrium theory [24][25], the calcination temperature of limestone increases with CO2 partial pressure. Therefore, one effective method to increase the desulfurization efficiency of oxy-fuel combustion is to increase the combustion temperature.…”

Section: Caco Cao+co mentioning

confidence: 99%

“…Previous investigations [29][30] had showed that when the temperature was increased from 850 o C to about 920 o C, the indirect desulfurization occurred, and the overall desulfurization efficiency increased significantly. In addition to the experiments conducted in FB combustors mentioned above [14,17,21,[26][27][28][29], Kim et al [25], Jeong et al [24] and Francisco et al [31] had also investigated the desulfurization mechanisms and behaviors of limestone by using thermo-gravimetric analyzers. It was found that the direct desulfurization reaction rate increased with the temperature while that of indirect desulfurization was hardly affected by the temperature.…”

Section: Caco Cao+co mentioning

confidence: 99%

“…Fig. 8 shows the equilibrium curve of CaCO3 calcination which is highly dependent on the CO2 partial pressure and temperature [24][25]. In traditional atmospheric air FB combustion, the reaction condition leads to the indirect desulfurization, i.e., a step of calcination of limestone (Reaction 1) occurs before SO2 is captured by CaO (Reaction 2), instead of CaCO3 (Reaction 3).…”

Section: Desulfurization Of Limestonementioning

confidence: 99%

“…Fluidized bed combustion is well-known for its economical desulfurization by introducing calcium based sorbents (e.g. limestone) into the furnace [24][25]. In a traditional FB combustor of air combustion, the calcination of limestone occurs prior to the desulfurization reaction (indirect desulfurization: Reactions 1-2).…”

Section: Introductionmentioning

confidence: 99%

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Experimental study of SO2 emissions and desulfurization of oxy-coal combustion in a 30 kWth pressurized fluidized bed combustor

Pang

Shao

Zhong

et al. 2020

Fuel

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Pressurized oxy-fuel combustion (POFC) has attracted wide attention due to its potentials of high efficiency and low cost in CO2 capture. Compared with numerical simulation and system analysis, there are few experimental studies about POFC. In order to investigate the SO2 emissions and desulfurization behaviors of limestone under continuous fuel-feeding POFC conditions, a series of oxy-coal combustion experiments were conducted with a 30 kWth pressurized fluidized bed combustor. The results showed that the SO2 emission was almost independent of combustion pressure and excess oxygen coefficient, while it was higher in air than in O2/CO2 atmosphere because less sulfur was retained by the coal ash. Although the higher CO2 partial pressure caused by an increase in combustion pressure from 0.1 MPa to 0.4 MPa had negative effects on the calcination of limestone and inhibited the indirect desulfurization, the higher combustion pressure was beneficial to improve the direct desulfurization efficiency. An increase in combustion temperature from 850 o C to 950 o C significantly improved the desulfurization efficiency of limestone with both atmospheric and pressurized oxy-coal combustion. SEM images were obtained and used to show the surface morphology of limestone products under different combustion conditions, which was helpful to the understanding of the desulfurization behaviors of limestone.

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“…The two different sulfurization routes, indirect and direct, are mainly determined by the CO2 partial pressure and the combustion temperature [24][25]. It has been proved…”

Section: Caco Cao+co mentioning

confidence: 99%

Section: Caco Cao+co mentioning

confidence: 99%

Section: Caco Cao+co mentioning

confidence: 99%

Section: Desulfurization Of Limestonementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Experimental study of SO2 emissions and desulfurization of oxy-coal combustion in a 30 kWth pressurized fluidized bed combustor

Pang

Shao

Zhong

et al. 2020

Fuel

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Effects of flue gas recirculation on energy, exergy, environment, and economics in oxy‐coal circulating fluidized‐bed power plants with CO₂ capture

Kim

Lim

Lee

et al. 2020

Intl J of Energy Research

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Summary CO2 capture and storage(CCS) are required for coal‐fired power plants, which are major sources of anthropogenic CO2 emission. In this study, energy, exergy, environment, and economic (4E) analyses were performed for a 500‐MWe oxy‐coal ultra‐supercritical circulating fluidized‐bed (CFB) power plant with CO2 capture. The effect of the location of flue‐gas recirculation (FGR) on the 4E values was investigated for wet FGR (wFGR) at 170°C, dry FGR (dFGR) at 68°C, and 80% wet and 20% dry FGR (wdFGR). The net electricity efficiencies of the wFGR and dFGR power plants were 37% and 36%, respectively. The exergy loss was the largest in the combustor and boiler area, where process improvement was possible. The levelized cost of electricity was approximately 60 $/MWh. The return on investment was 6.7% and 6.1%/y for the wFGR and dFGR plants, respectively. The CO2 emission rate decreased by 90% (from 690 to 76 kg‐CO2/MWh) in the oxy‐coal power plants with CO2 capture. Relative to the wFGR, the dFGR was advantageous for preventing material corrosion because of the lower sulfur content in the FGR stream. For the wdFGR power plant, the process performance was intermediate, that is, between that of the wFGR plant and that of the dFGR plant. The study provided an effective tool for identifying the technological and economic effects of the FGR location for the oxy‐coal power plant with CCS via 4E analyses.

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Oxy-Fuel Combustion in FBRs

Duan,

2024

Fluidized Bed Reactors for Carbon Capture

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Direct desulfurization of limestones under oxy-circulating fluidized bed combustion conditions

Cited by 35 publications

References 27 publications

Experimental study of SO2 emissions and desulfurization of oxy-coal combustion in a 30 kWth pressurized fluidized bed combustor

Experimental study of SO2 emissions and desulfurization of oxy-coal combustion in a 30 kWth pressurized fluidized bed combustor

Effects of flue gas recirculation on energy, exergy, environment, and economics in oxy‐coal circulating fluidized‐bed power plants with CO₂ capture

Oxy-Fuel Combustion in FBRs

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Direct desulfurization of limestones under oxy-circulating fluidized bed combustion conditions

Cited by 35 publications

References 27 publications

Experimental study of SO2 emissions and desulfurization of oxy-coal combustion in a 30 kWth pressurized fluidized bed combustor

Experimental study of SO2 emissions and desulfurization of oxy-coal combustion in a 30 kWth pressurized fluidized bed combustor

Effects of flue gas recirculation on energy, exergy, environment, and economics in oxy‐coal circulating fluidized‐bed power plants with CO2 capture

Oxy-Fuel Combustion in FBRs

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Effects of flue gas recirculation on energy, exergy, environment, and economics in oxy‐coal circulating fluidized‐bed power plants with CO₂ capture