Enhancement of Ca(OH)<sub>2</sub>/Fly Ash Sorbent for the Dry-Desulfurization Process

Yamamoto, Makoto; Komaki, Satoru; Nakajima, D.; Matsushima, Norihiko; Liú, Dan; Nishioka, Makihito; Sadakata, Masayoshi

doi:10.1021/ef050438q

Cited by 7 publications

(4 citation statements)

References 15 publications

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“…Particularly reactions with SO 2 -either in the gas phase or dissolved in water (acid rain) -are a main source of weathering and corrosion. Whereas in this context the strong chemical affinity of CaO/Ca(OH) 2 towards SO 2 is unwanted, the pronounced reactivity of quicklime towards SO 2 is exploited in the removal of this gas from industrial flue gas mixtures (so called "(dry) desulfurization process" [1][2][3] ) to prevent emission into the atmosphere. The high-purity calcium sulfate (gypsum) formed in this process is also used as raw material in the building materials industry.…”

Section: Introductionmentioning

confidence: 99%

Identification of Intermediates in the Reaction Pathway of SO₂ on the CaO Surface: From Physisorption to Sulfite to Sulfate

Schewe

Maleki

Liberto

et al. 2023

Chemistry A European J

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The interaction of CaO and Ca(OH) 2 with solvated or gaseous SO 2 plays a crucial role in the corrosion of urban infrastructure by acid rain or in the removal of SO 2 from flue gas. We carried out a combined spectroscopic and theoretical investigation on the interaction of SO 2 with a CaO(001) single crystal. First, the surface chemistry of SO 2 was investigated at different temperatures using polarization-resolved IR reflection absorption spectroscopy. Three species were identified, and an in-depth density functional theory study was carried out, which allowed deriving a consistent picture. Unexpectedly, low temperature exposure to SO 2 solely yields a physisorbed species. Only above 100 K, the transformation of this weakly bound adsorbate first to a chemisorbed sulfite and then to a sulfate occurs, effectively passivatating the surface. Our results provide the basis for more efficient strategies in corrosion protection of urban infrastructure and in lime-based desulfurization of flue gas.

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Section: Introductionmentioning

confidence: 99%

Identification of Intermediates in the Reaction Pathway of SO₂ on the CaO Surface: From Physisorption to Sulfite to Sulfate

Schewe

Maleki

Liberto

et al. 2023

Chemistry A European J

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“…At present, sulphur-containing waste gas is generally removed through wet desulfurization and dry desulphurization methods [4][5][6][7][8][9][10]. Specifically, the dry desulfurization method uses powder or particulate adsorbent and removes sulphur-containing waste gas through physical adsorption or chemical absorption of solid adsorbent.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Migration Laws of Dense Particle Flow in Pipelines

Fu¹,

Guo²,

Dong³

et al. 2022

Int. j. simul. model.

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To explore the migration distribution laws of the cleaning agent of solid powder in industrial ventilation pipelines, a gas-solid flow migration model based on dense discrete phase model (DDPM) was built. Influences of various material injection methods (injection and jetting methods), positions, and directions in the narrowing zone of pipelines based on the migration laws of particulate cleaning agents in the pipelines were analysed. Results demonstrate that under the top injection method in the narrowing zone, the particulate cleaning agent presents obvious flow characteristics along the pipeline walls and cleaning agent concentration distributes unevenly in the pipelines. After the injection method is changed to top jetting, particle concentration remains high at one end near the wall and low at the other end. After changing the mouth from the top of the narrowing zone to the middle section and changing the spraying direction from perpendicular to the mainstream direction to the horizontal, the particle concentration of the cleaning agent reaches uniform distribution near the mouth and at the pipeline ends. Particle concentration in the pipelines is improved significantly.

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“…In this process, the main component of FGDA could be decomposed into CaO and SO 2 . CaO could be reused as desulfurizing agent and SO 2 could recycle as a chemical material . As a relatively important chemical raw material, the SO 2 gas collected in the actual production process can be used to prepare sulfite or sulfuric acid to increase its value.…”

Section: Introductionmentioning

confidence: 99%

“…25 CaO could be reused as desulfurizing agent and SO 2 could recycle as a chemical material. 26 As a relatively important chemical raw material, the SO 2 gas collected in the actual production process can be used to prepare sulfite or sulfuric acid to increase its value. However, in the actual study, the decomposition temperature of FGDA reached almost 1100 °C.…”

Section: Introductionmentioning

confidence: 99%

Study on Thermal Decomposition Process of Semidry Flue Gas Desulfurization Ash

Yang

Fan

et al. 2019

Energy Fuels

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Semidry flue gas desulfurization ash (FGDA) is a kind of solid waste, which is mainly composed of CaSO3 and produced by coal-fired power plants. Thermal decomposition has been considered as a promising method for FGDA treatment. However, strict equipment requirements and the high energy consumption brought by the high decomposition temperature do hinder the industrial application of the thermal treatment methods. In order to solve these issues, the mechanism of FGDA thermal decomposition was investigated, with emphasis on the effect of additives, impurities, and reaction conditions. The results showed that the temperature, reductant of carbon powder, and the impurity of Ca(OH)2 in the FGDA promoted the decomposition efficiency of CaSO3, while CaCO3 in the FGDA had a negative effect on CaSO3 decomposition. An optimal increase of the thermal decomposition efficiency of FGDA was achieved by using carbon powder as a reducing additive. Furthermore, the decomposition temperature of FGDA was decreased from 1100 to 1000 °C. The decomposition efficiency of CaSO3 increased from 55.56% to 89.48% at 1000 °C. The content of active CaO in the roasting product reached 40%, which is a potential desulfurizer.

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Enhancement of Ca(OH)₂/Fly Ash Sorbent for the Dry-Desulfurization Process

Cited by 7 publications

References 15 publications

Identification of Intermediates in the Reaction Pathway of SO₂ on the CaO Surface: From Physisorption to Sulfite to Sulfate

Identification of Intermediates in the Reaction Pathway of SO₂ on the CaO Surface: From Physisorption to Sulfite to Sulfate

Numerical Simulation of Migration Laws of Dense Particle Flow in Pipelines

Study on Thermal Decomposition Process of Semidry Flue Gas Desulfurization Ash

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Enhancement of Ca(OH)2/Fly Ash Sorbent for the Dry-Desulfurization Process

Cited by 7 publications

References 15 publications

Identification of Intermediates in the Reaction Pathway of SO2 on the CaO Surface: From Physisorption to Sulfite to Sulfate

Identification of Intermediates in the Reaction Pathway of SO2 on the CaO Surface: From Physisorption to Sulfite to Sulfate

Numerical Simulation of Migration Laws of Dense Particle Flow in Pipelines

Study on Thermal Decomposition Process of Semidry Flue Gas Desulfurization Ash

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Enhancement of Ca(OH)₂/Fly Ash Sorbent for the Dry-Desulfurization Process

Identification of Intermediates in the Reaction Pathway of SO₂ on the CaO Surface: From Physisorption to Sulfite to Sulfate

Identification of Intermediates in the Reaction Pathway of SO₂ on the CaO Surface: From Physisorption to Sulfite to Sulfate