Ultra-fine particulate matters (PMs) formation during air and oxy-coal combustion: Kinetics study

Niu, Yanqing; Yan, Binggong; Liu, Siqi; Yang, Liang; Dong, Ning; Suo, Hui

doi:10.1016/j.apenergy.2018.02.164

Cited by 29 publications

(7 citation statements)

References 34 publications

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“…Figure b represents −COONa + SiO 2 + Al 2 O 3 + C. The mass fractions of silicon and aluminum in PM increase obviously after adding silicon–aluminum compounds. Under the strong reducing atmosphere and high local temperature of char combustion, a part of SiO 2 and Al 2 O 3 additives will be reduced to suboxides or substances that are easier to gasify . On the other hand, a small part of SiO 2 and Al 2 O 3 particles smaller than 10 μm are fixed to the synthetic char because the sieving process cannot remove all SiO 2 and Al 2 O 3 particles with particle size < 10 μm.…”

Section: Resultsmentioning

confidence: 99%

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Effect of Interaction between Sodium and Oxides of Silicon and Aluminum on the Formation of Fine Particulates during Synthetic Char Combustion

Ruan

Xiao

et al. 2018

Energy Fuels

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Alkali and alkaline earth metals (AAEM), especially sodium, make a great contribution to the formation of fine particulates during coal combustion. Extraction and loading through chemical methods have been widely used for coal pretreatment to change the occurrence and content of sodium but could not load intrinsic minerals. In this study, synthetic char was used as a mineral carrier to study the characteristic of fine particulate formation during coal combustion. The silica and alumina were added to synthetic char as intrinsic minerals to study the interaction between sodium and Si and Al compounds in coal. The results show that the inorganic water-soluble sodium is more likely to form stable fine particles, while organic sodium prefers to react with silica and alumina in the absence of chlorine. Chemical reactions and physical capture are two main ways for sodium capture by silica and alumina. The content of sodium captured through chemical reactions is 2.4 times that by the physical way.

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Section: Resultsmentioning

confidence: 99%

“…Under the strong reducing atmosphere and high local temperature of char combustion, a part of SiO 2 and Al 2 O 3 additives will be reduced to suboxides or substances that are easier to gasify. 28 On the other hand, a small part of SiO 2 and Al 2 O 3 particles smaller than 10 μm are fixed to the…”

Section: Methodsmentioning

confidence: 99%

Effect of Interaction between Sodium and Oxides of Silicon and Aluminum on the Formation of Fine Particulates during Synthetic Char Combustion

Ruan

Xiao

et al. 2018

Energy Fuels

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“…The emissions of environmentally sensitive toxic elements (TEs), such as As, Cr, Cu, Se, and Pb, during combustion have important implications on the application of oxy-fuel combustion technology. − TEs were volatile and subsequently condensed either homogeneously to form sub-micrometer ash particulate or heterogeneously to deposit on the surface of fine fly ash with the decomposition of their host minerals or organic matter. − The transformation characteristics of TEs received fairly intensive study in normal air–fuel combustion and reported that the volatility of TE, association of TE, combustion conditions, and pollution control device were the main determinants. − It is a consensus that the gas compositions inside the boiler during oxy-fuel combustion vary among that of the conventional air combustion. , The heat capacity of the gases and the gas flow in oxy-fuel combustion differ greatly from that of air combustion and resulted in the change of heat transfer . There have been many investigations into the thermochemical behavior of coal during oxy-fuel combustion, which reported that the elevated combustion temperature and oxygen concentration may result in the increase of carbon conversion in oxy-fuel combustion. , Accompanied by the change of the combustion environment in oxy-fuel combustion, the TEs and their host minerals are varied.…”

Section: Introductionmentioning

confidence: 99%

Effects of Gaseous Agents on Trace Element Emission Behavior during Co-combustion of Coal with Biomass

Zhou

Gao

et al. 2020

Energy Fuels

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The speciation characterizations of toxic elements (TEs) under air and oxy-fuel combustion of bituminous coal/biomass blends were determined via laboratory simulation experiments. The experiments were performed in a fluidized bed reactor with different combustion temperatures (800, 900, and 1000 °C) and combustion atmospheres (21% O2 + 79% N2, 21% O2 + 79% CO2, 30% O2 + 70% CO2, and 35% O2 + 65% CO2). The concentrations of the selected TEs (As, Cr, Cu, Pb, V, Sb, Se, and Zn) in feedstock, bottom ash, and fly ash were determined using inductively coupled plasma mass spectrometry. The results showed that the redistribution characterizations of the selected TEs were greatly proportional to the reactivity of TE, association of TE, and combustion temperature and atmosphere. The selected gaseous TEs could be captured effectively by adding biomass for the chemical reactions with alkali and alkaline earth metals (Ca, Mg, Fe, K, and Na). The volatile TEs (As, Cu, Pb, Sb, Se, and Zn) were favored to enrich in gaseous and fine particles with the increase of the combustion temperature and oxygen concentration. The non-volatile TEs (Cr and V) were mainly associated with bottom ash and fly ash. More critical measures should be adopted to clean up fly ash and atmospheric pollutants during oxy-fuel combustion.

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“…It was found that the oxidation of soot and emission of ultrafine mineral particles are the two main factors that influence the fine particle formation. Niu et al 22 conducted a kinetic study of the formation of PM 0.1 during coal combustion and found that the elevated flue gas recirculation ratio is detrimental to PM adsorption.…”

Section: Introductionmentioning

confidence: 99%

Effects of Alkali Metals on the Formation of Particulate Matter and Adsorption of Floating Beads during Zhundong Coal Combustion

et al. 2019

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Zhundong coal plays an important role in China’s energy utilization. However, due to its high content of alkali metals, it produces a large amount of particulate matter during combustion. In this paper, the coal was first washed with deionized water to remove the influence of alkali-metal salts. Then, different kinds of Na salts (1% NaC1, 1% Na2SO4, and 1% NaAc) were added to the de-alkali coals. The effect of Na salts on the formation of PM10 was studied in a high-temperature drop-tube furnace at 1300 °C. After the addition of the Na salts, the amount of particulate matter emission was significantly increased. When 1% NaCl was added to the de-alkali coal, the amount of PM1 produced was 3.1 times that of the raw coal, while the amount of PM2.5 produced was 3 times that of raw coal. After adding 1% Na2SO4, the amounts of PM1 and PM2.5 produced were twice those of the raw coal. In addition, floating beads exhibit a good adsorption effect on particulate matter for the combustion of the coal with different Na salts added. The yield of ultrafine and submicrometer particles was significantly reduced when 3% floating beads were added to the de-alkali coal with Na salts added. The reductions of PM1 were 47.0% for NaCl, 51.0% for Na2SO4, and 29.4% for NaAc. Additionally, the adsorption process of floating beads on ultrafine and submicrometer particles is mainly through the reaction between alkali-metal vapors and SiO2 and Al2O3 in the sorbents.

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Ultra-fine particulate matters (PMs) formation during air and oxy-coal combustion: Kinetics study

Cited by 29 publications

References 34 publications

Effect of Interaction between Sodium and Oxides of Silicon and Aluminum on the Formation of Fine Particulates during Synthetic Char Combustion

Effect of Interaction between Sodium and Oxides of Silicon and Aluminum on the Formation of Fine Particulates during Synthetic Char Combustion

Effects of Gaseous Agents on Trace Element Emission Behavior during Co-combustion of Coal with Biomass

Effects of Alkali Metals on the Formation of Particulate Matter and Adsorption of Floating Beads during Zhundong Coal Combustion

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