Dissolution rate of limestone for wet flue gas desulfurization in the presence of sulfite

Gao, Xiang; Guo, Rui‐tang; Ding, Honglei; Luo, Zhongyang; Cen, Kefa

doi:10.1016/j.jhazmat.2009.02.156

Cited by 49 publications

(14 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Busenberg and Plummer reported that their sedimentary dolomites dissolved faster than the more ordered hydrothermal samples and that slow dissolution refers to thermodynamic stability. For limestones, it has been reported that a smaller crystallite size results as a higher dissolution rate . These reports are consistent with our results, since metamorphism results in recrystallisation and formation of larger crystals.…”

Section: Discussionsupporting

confidence: 94%

“…For limestones, it has been reported that a smaller crystallite size results as a higher dissolution rate. [38] These reports are consistent with our results, since metamorphism results in recrystallisation and formation of larger crystals. Further consistency is found from the study of Rauch and White, [20] in which dissolution rate was discovered to be inversely related to grain size.…”

Section: Discussionsupporting

confidence: 93%

See 1 more Smart Citation

Characterisation of dolomites before and after reactivity measurement with HCl solution

Järvinen

Leiro

Bjondahl

et al. 2014

Surf. Interface Anal.

View full text Add to dashboard Cite

aThe aim of this study was to compare different types of dolomites through batch reactivity experiments between HCl and dolomite powders, and ex-situ characterisation of the particles before and after dissolution. Sedimentary dolomites were observed to have higher initial reactivities than metamorphic ones with sufficiently low calcite concentrations (<6% according to our regression model). In addition, the initial reactivities of the metamorphic dolomites were dependent on calcite concentration and could exceed those of the sedimentary dolomites. A regression model is presented for the dependence of initial reactivity on mineral composition and type of origin (sedimentary/metamorphic). The samples with the highest initial reactivities had also the largest BET (Brunauer, Emmet, Teller) surface areas obtained with nitrogen physisorption. Yet our data indicates that mineral composition of the dolomite has a greater influence on the initial reactivity than the BET surface area. Furthermore, it was found that the surface of sedimentary dolomites, unlike the surface of metamorphic dolomites, becomes porous during dissolution.

show abstract

Section: Discussionsupporting

confidence: 94%

Section: Discussionsupporting

confidence: 93%

Characterisation of dolomites before and after reactivity measurement with HCl solution

Järvinen

Leiro

Bjondahl

et al. 2014

Surf. Interface Anal.

View full text Add to dashboard Cite

show abstract

“…This may be because Na + can promote the dissolution of CaCO 3 . 26 Dissolved CaCO 3 provide CO 3 2− after the hydrolysis of OH − and SO 2 which are soluble in water after H 2 SO 3 ionization produced by H + neutralization reaction occurred, to achieve the effect of slurry pH buffer falling. However, the pH buffering capacity of sodium citrate was lower than that of BC.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Wet Flue Gas Desulfurization Properties by Additives of Organic Acids, Organic Salts, Inorganic Salts, and Organic Amines

et al. 2020

View full text Add to dashboard Cite

In order to enhance wet flue gas desulfurization efficiency and reduce cost, the effects of different series of additives (typical organic acids, organic salts, inorganic salts, organic amines, and their mixture) on the desulfurization properties, including pH buffering characteristics of slurry, dissolution characteristics of CaCO 3 , oxidation characteristics of CaSO 3 , desulfurization efficiency, and economic cost were investigated in this work. The results show that the pH buffering capacity is sodium benzoate ≈ Na 2 SO 4 > adipic acid > double oxazine. The dissolution promoting effect of CaCO 3 is acetic acid > double oxazine ≈ sodium acetate > MgSO 4 . The additives that can significantly promote the oxidation of CaSO 3 are adipic acid, citric acid, acetic acid, MgSO 4 , and Na 2 SO 4 . Without an additive, the desulfurization efficiency of CaCO 3 slurry decreased to 85.87% after 4 h. After the addition of the composite additive (CA-3), the desulfurization efficiency of CaCO 3 slurry remained 96.53% for 4 h, increasing by 10.66%. The main reasons for the enhancement in the desulfurization process may be a collection of three factors: the reversible hydrolysis reactions of acetic acid and sodium acetate, the formation of an acid−base conjugate system by sodium benzoate, and the formation of a neutral ion pair MgSO 3 by MgSO 4 in the slurry. In addition, the composite additive has been used in the Dabie mountain power plant of China. The economic benefit analysis shows that the desulfurization unit of 4 × 640 MW coal-fired power plant can save 1.26 million dollars per year by composite additive.

show abstract

“…Finally, stirring speed had a major effect especially on sorbents made from fly ash and bottom ash. Agitation caused by stirring enhances convective mass transfer between reactants thus promoting the reaction . Apart from the effects in the mass transfer, agitation also assists in detaching and removing the product layer, which therefore greatly reduces resistance due to product layer .…”

Section: Resultsmentioning

confidence: 99%

Use of fly ash, bottom ash and zeolite as additives for enhancing lime reactivity towards flue gas desulfurization

Maina

Mbarawa

2011

Env Prog and Sustain Energy

View full text Add to dashboard Cite

Lime reactivity toward desulfurization was examined by blending lime with pozzolanic additives namely fly ash, bottom ash, and zeolite. The reactivity was tested in a pH‐stat apparatus. Apart from lime to additive ratio, other important operating conditions, namely, temperature, solid to liquid ratio, and stirring speed, were varied accordingly using the design expert's design of experiments. Central cubic design was used to investigate linear, quadratic, cubic, and cross‐product effect of these operatives. Sorbents made from lime‐zeolite blends were found to have the highest reactivity followed by fly ash then bottom ash. These results were confirmed through sorption capacities of the best sorbents using a fixed bed reactor. BET surface area analysis of the best sorbents indicated that surface area improvement is the root cause of improvements in reactivity and sorption capacities. Temperature had the largest effect on reactivity. The other operative's effect varied from one additive to the other. © 2011 American Institute of Chemical Engineers Environ Prog, 32: 75–83, 2013.

show abstract

Dissolution rate of limestone for wet flue gas desulfurization in the presence of sulfite

Cited by 49 publications

References 15 publications

Characterisation of dolomites before and after reactivity measurement with HCl solution

Characterisation of dolomites before and after reactivity measurement with HCl solution

Enhanced Wet Flue Gas Desulfurization Properties by Additives of Organic Acids, Organic Salts, Inorganic Salts, and Organic Amines

Use of fly ash, bottom ash and zeolite as additives for enhancing lime reactivity towards flue gas desulfurization

Contact Info

Product

Resources

About