Effect of Additives to Improve Calcium-Based Sorbents in Semi-Dry Flue Gas Desulphurization

Natural brucite is unstable in aqueous media, was modified with sodium hexametaphosphate(SHMP) as a surface treatment. In order to explore the effect of sodium hexametaphosphate on the surface of brucite were studied by using relative sedimentation measurement, scanning electron microscopy (SEM), Zeta potential, infrared spectroscopy (FT-IR) and extend DLVO theoretical calculation. The sedimentation experiments show that the sodium hexametaphosphate modification have a positive effect on the dispersion of brucite in aqueous media. The sodium hexametaphosphate changes the potential of the burburite particles, which leads to the increase of electrostatic double layer energy between particles. Infrared spectrum analysis shows that sodium hexametaphosphate can form a hydrophilic complex with magnesium ions on the surface of brucite. DLVO extend theoretical calculation shows that the total energy between brucite particles turned from unfavorable to favorable with the increasing particles distance, and the steric hindrance interaction energy plays a dominant role. The results show that sodium hexametaphosphate have a positive effect on the stability of natural brucite suspension.

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“…The total potential energy between brucite particles can be obtained from (6)(7)(8)(9)(10)(11)(12), and the results are…”

Section: Interaction Energy Between Brucite Particlesmentioning

confidence: 99%

“…The well-dispersed brucite can also be used as an adsorbent to remove heavy metal ions [9] , and be used for flue gas desulfurization in environmental remediation [10] .…”

Section: Introductionmentioning

confidence: 99%

Effect of sodium hexametaphosphate modification on dispersion stability of natural brucite in aqueous media

ZHAO

Zhong

Zhang

et al. 2023

Preprint

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“…The typical width and height of HA, as shown, are around 20 and 140 nm, correspondingly. YSZ powder is available in granule and submicron sizes 9,10,11 . To make multilayer scaffolding, PLLA was soluble in acetone.…”

Section: Materials Fabricationmentioning

confidence: 99%

Polylactic acid/hydroxyapatite/yttria-stabilized zircon synthetic nanocomposite scaffolding compression and flexural characteristics

Lakshmaiya

2023

International Conference on Mathematical and Statistical Physics, Computational Science, Education and Communication (ICMSCE 20

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“…10 In the spray chamber, evaporation of water and drying of the droplets takes place as it flows downward, with concurrent formation of a dry waste product containing mostly sulfites, unreacted hydrated lime (Ca[OH] 2 ), and traces of sulfate salts. 10,11 Part of the dry waste is collected at the bottom of the scrubber, while the remaining suspended solids are removed by a particulate control device such as a baghouse or an electrostatic precipitator (ESP). 12 The operating cost of the FGD process mainly depends on the following factors: the amount and type of sorbent used, utility (water and electricity) consumption, maintenance required, and the end-product disposal cost.…”

Section: Introductionmentioning

confidence: 99%

“…The residence time in the absorption chamber should be sufficient to allow SO 2 and other gases such as SO 3 and HCl to react with the sorbent . In the spray chamber, evaporation of water and drying of the droplets takes place as it flows downward, with concurrent formation of a dry waste product containing mostly sulfites, unreacted hydrated lime (Ca[OH] 2 ), and traces of sulfate salts. , Part of the dry waste is collected at the bottom of the scrubber, while the remaining suspended solids are removed by a particulate control device such as a baghouse or an electrostatic precipitator (ESP) …”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Sorbents for Spray Dry Scrubbing of SO₂ from Flue Gases

et al. 2023

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This study presents the findings of an investigation involving the absorption of SO2 from flue gases, using three different sorbents, in a spray dryer. Experimentation involved the evaluation of three sorbents, i.e., hydrated lime (Ca[OH]2), limestone (CaCO3), and trona (Na2CO3·NaHCO3·2H2O), and their relevant properties, for flue gas desulfurization by spray dry scrubbing. Experiments were conducted to explore the effects of spray characteristics in the spray drying scrubber on SO2 removal efficiency using the selected sorbents. The ranges of various operating parameters were considered, including the stoichiometric molar ratio of (1.0–2.5), the inlet gas phase temperature of (120–180 °C), and an inlet SO2 concentration of 1000 ppm. The use of trona gave better SO2 removal characteristics; a high SO2 removal efficiency of 94% was recorded at an inlet gas phase temperature of 120 °C and a stoichiometric molar ratio of 1.5. Under the same operating conditions, Ca[OH]2 and CaCO3 gave 82 and 76% SO2 removal efficiency, respectively. Analysis of the desulfurization products by X-ray fluorescence (XRF) and Fourier transform infrared (FTIR) spectroscopy revealed the presence of CaSO3/Na2SO3, a product of the semidry desulfurization reaction. A significant proportion of unreacted sorbent was observed when Ca[OH]2 and CaCO3 sorbents were used at a stoichiometric ratio of 2.0. Trona also gave the highest degree of conversion (96%) at a stoichiometric molar ratio of 1.0. Ca[OH]2 and CaCO3 gave 63 and 59%, respectively, under the same operating conditions.

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Effect of Additives to Improve Calcium-Based Sorbents in Semi-Dry Flue Gas Desulphurization

Cited by 12 publications

References 16 publications

Effect of sodium hexametaphosphate modification on dispersion stability of natural brucite in aqueous media

Effect of sodium hexametaphosphate modification on dispersion stability of natural brucite in aqueous media

Polylactic acid/hydroxyapatite/yttria-stabilized zircon synthetic nanocomposite scaffolding compression and flexural characteristics

Comparative Study of Sorbents for Spray Dry Scrubbing of SO₂ from Flue Gases

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Effect of Additives to Improve Calcium-Based Sorbents in Semi-Dry Flue Gas Desulphurization

Cited by 12 publications

References 16 publications

Effect of sodium hexametaphosphate modification on dispersion stability of natural brucite in aqueous media

Effect of sodium hexametaphosphate modification on dispersion stability of natural brucite in aqueous media

Polylactic acid/hydroxyapatite/yttria-stabilized zircon synthetic nanocomposite scaffolding compression and flexural characteristics

Comparative Study of Sorbents for Spray Dry Scrubbing of SO2 from Flue Gases

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Comparative Study of Sorbents for Spray Dry Scrubbing of SO₂ from Flue Gases