Scheme of O2/CO2 Combustion with Partial CO2 Removal from Recycled Gas. Part 2: High Efficiency of In-Furnace Desulfurization

Líu, Hao; Yao, Hong; Yuan, Xing; Dong, Siwei; Ando, Takashi; Okazaki, Ken

doi:10.1021/ef201464z

Cited by 4 publications

(5 citation statements)

References 14 publications

(14 reference statements)

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“…For instance, a higher O 2 concentration, typically 30% in contrast to 21% in air, is required for achieving a similar combustion performance to that of air combustion. , The resulting flue gas contains mainly CO 2 and a minor amount of O 2 , N 2 , SO 2 , etc., while that from air combustion consists of a great quantity of N 2 and CO 2 and a minor amount of O 2 , SO 2 , etc. Consequently, coal combustion processes, including devolatilization and ignition, − char burnout, ,− and pollutant formation, − are more or less different from those in air combustion.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Particle Size Evolution during Pulverized Coal Combustion in O₂/CO₂ and O₂/N₂ Atmospheres

2013

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The present work was aimed at investigating particle size evolution during pulverized coal combustion in an O2/CO2 atmosphere in comparison to that in an O2/N2 atmosphere. Two narrow size fractions of a bituminous coal were devolatilized in N2 and CO2 and burned in O2/N2 and O2/CO2 atmospheres in a high-temperature drop-tube furnace. The resulting chars and residual ashes as well as the parent coals were characterized with scanning-electron-microscopy-based image analysis to quantify particle size distributions, which were systematically compared. The results show that devolatilization in CO2 produces finer char particles than that in N2. It may have a consequence on particle size evolution and ash particle formation during char conversion. Combustion in an O2/CO2 atmosphere generally generates more fine ash particles than burning in an O2/N2 atmosphere at the same oxygen level. Increasing the O2 concentration decreases the amount of the fine ash particles in both atmospheres. The results also show that changing gas atmospheres has a greater influence on the evolution of the particle size distribution during the combustion of the larger coal size fraction.

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Section: Introductionmentioning

confidence: 99%

Comparison of Particle Size Evolution during Pulverized Coal Combustion in O₂/CO₂ and O₂/N₂ Atmospheres

2013

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“…The ratios of NO exhausted in oxy-coal to that in air combustion from the literatures (Andersson et al, 2008;Shaddix et al, 2011;Stadler et al, 2011;Zhang et al, 2011;Liu et al, 2012).…”

Section: Figmentioning

confidence: 99%

“…Fig. 1 shows the ratio of NO exhausts from oxy-coal to that from air combustion ranging from 1.25% to 81.8% (Andersson et al, 2008;Shaddix and Molina, 2011;Stadler et al, 2011;Zhang et al, 2011;Liu et al, 2012). The great difference indicates that the coal properties and experimental conditions may largely influence NO reducing potentials.…”

Section: Introductionmentioning

confidence: 99%

“…And while Zhang et al (2011) pointed that the NO x emission amount was 40% lower in oxy-coal than in air combustion, Stadler et al (2011) revealed NO emission from oxy-coal combustion shares two-thirds proportion of that from air when German lignite was combusted in a vertical pilotscale furnace. Still Liu et al (2012) stated that NO emission from oxy-coal combustion with partial CO 2 removal from the RFG was decreased to 1.25% of that in air combustion.…”

Section: Introductionmentioning

confidence: 99%

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NO Reduction Scale of Three Typical Chinese Coals during Oxy-Coal Combustion

Luo

Yao

2015

Aerosol Air Qual. Res.

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Oxy-coal combustion has become one of the most promising technologies for its ability to capture carbon dioxide and produce low pollutant emissions. In particular, the NO emission from oxy-coal combustion is found to be much lower than that in air combustion, but the NO reduction degree varies. In order to ascertain a rough NO reduction potential for Chinese coals, three types of coals (lignite, bituminous coal and anthracite) were combusted in a drop-tube furnace (DTF) in air and oxy-coal atmosphere during this study. The results showed that oxy-coal combustion could largely reduce NO emission down to 50% for the three coals. The NO reducing potential of oxy-coal technology for the lignite was higher than that for the bituminous coal and the anthracite. High content of volatiles in the lignite was considered as the major reason. NO removal was suppressed in the bituminous coal combustion due to the impacts of CaO and Fe 2 O 3 .

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“…Anthropogenic activities contribute most to CO 2 emissions, among which coal combustion was responsible for about 46% of CO 2 emissions from fossil fuel combustion, with 31% emitted from coal-fired power plants . To realize large-scale CO 2 emission reduction in power plants, several CO 2 capture methods have been proposed in recent years. − Oxy-fuel combustion is considered as one of the most promising CO 2 capture technologies because of the advantages of near zero CO 2 emission, cost competitiveness, easy modification on the existing plant, and suitability for large-scale application. − Oxy-fuel combustion has been extensively studied for pulverized coal combustion and circulating fluidized bed combustion, the latter of which has the advantage of allowing for excellent fuel flexibility and is considered a better choice for CO 2 capture. − The enrichment of CO 2 with a high concentration of above 80% in oxy-fuel flue gas can be achieved, which is favorable to the subsequent CO 2 transportation, utilization, and storage …”

Section: Introductionmentioning

confidence: 99%

Effect of Acid Gases on Elemental Mercury Removal in an Oxy-fuel CO₂ Compression Process

Huang

Luo

et al. 2017

Energy Fuels

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Oxy-fuel combustion is considered as one of the most promising options for capturing CO2 from coal-fired power plants. Oxy-fuel flue gas contains traces of gaseous elemental mercury (Hg0) impurity, which accumulate in the CO2 compression units, causing severe damage to the aluminum heat exchangers. It is of great interest that the co-capture of flue gas impurities, such as nitrogen oxide (NO x ) and elemental mercury, could be achieved in a CO2 compression system at a high pressure. Currently, most of the studies associated with Hg0 removal were conducted on traditional gas-cleaning devices at atmospheric pressure. It has been demonstrated that both NO x and SO2 from flue gas played a significant role in Hg0 reactions at atmospheric pressure in O2/CO2 (oxy-combustion) or O2/N2 (air-fired) conditions. However, the effect of those acidic gases on elemental mercury removal in the oxy-fuel compression system at high pressures was unclear. In this work, gas-phase Hg0 oxidation by NO x and SO2 was experimentally performed at the simulated O2/N2 and O2/CO2 atmospheres at pressures up to 2.5 MPa. It was found that Hg0 removal was dependent upon the concentration of NO2 in flue gas and primarily achieved by gas-phase reactions between Hg0 and NO2. High pressure dramatically enhanced the oxidation of NO to NO2. Thus, the flue gas impurity Hg0 could be efficiently removed through reacting with NO2 in the CO2 compression purification units. SO2 hardly reacted with Hg0 but affected the reaction of Hg0 and NO2. The presence of SO2 inhibited mercury removal especially at high pressures because of the decreased NO2 concentration through the reaction with SO2 and the decomposition of HgO to Hg0 by SO2. The presence of CO2 made the Hg0 removal rate less dependent upon the pressure. The removal behavior of Hg0 in the O2/CO2 atmosphere was similar to that in the O2/N2 atmosphere at pressures lower than 1.0 MPa. With the increasing pressure, the removal rate of Hg0 in the O2/CO2 atmosphere was lower than that in the O2/N2 atmosphere.

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Scheme of O₂/CO₂ Combustion with Partial CO₂ Removal from Recycled Gas. Part 2: High Efficiency of In-Furnace Desulfurization

Cited by 4 publications

References 14 publications

Comparison of Particle Size Evolution during Pulverized Coal Combustion in O₂/CO₂ and O₂/N₂ Atmospheres

Comparison of Particle Size Evolution during Pulverized Coal Combustion in O₂/CO₂ and O₂/N₂ Atmospheres

NO Reduction Scale of Three Typical Chinese Coals during Oxy-Coal Combustion

Effect of Acid Gases on Elemental Mercury Removal in an Oxy-fuel CO₂ Compression Process

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Scheme of O2/CO2 Combustion with Partial CO2 Removal from Recycled Gas. Part 2: High Efficiency of In-Furnace Desulfurization

Cited by 4 publications

References 14 publications

Comparison of Particle Size Evolution during Pulverized Coal Combustion in O2/CO2 and O2/N2 Atmospheres

Comparison of Particle Size Evolution during Pulverized Coal Combustion in O2/CO2 and O2/N2 Atmospheres

NO Reduction Scale of Three Typical Chinese Coals during Oxy-Coal Combustion

Effect of Acid Gases on Elemental Mercury Removal in an Oxy-fuel CO2 Compression Process

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Scheme of O₂/CO₂ Combustion with Partial CO₂ Removal from Recycled Gas. Part 2: High Efficiency of In-Furnace Desulfurization

Comparison of Particle Size Evolution during Pulverized Coal Combustion in O₂/CO₂ and O₂/N₂ Atmospheres

Comparison of Particle Size Evolution during Pulverized Coal Combustion in O₂/CO₂ and O₂/N₂ Atmospheres

Effect of Acid Gases on Elemental Mercury Removal in an Oxy-fuel CO₂ Compression Process