Optimization of wet flue gas desulfurization system using recycled waste oyster shell as high-grade limestone substitutes

Lim, Jonghun; Cho, Hyungtae; Kim, Junghwan

doi:10.1016/j.jclepro.2021.128492

Cited by 52 publications

(20 citation statements)

References 22 publications

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“…Fourier Transform Infrared Spectroscopy (FTIR) allowed the author to identify low magnesium calcite, high magnesium calcite, dolomite and huntite [21,24]. These carbonate phases were determined on the basis of the typical infra-red absorption bands for these minerals [21,24,[46][47][48] (Figures 9-12). Low magnesium calcite was identified on the basis of the infra-red bands with the following values: V 4 = 712 cm −1 , V 2 = 847 cm −1 , V 2 -ranging from 872 to 874 cm −1 , V 3 -ranging from 1.415 to 1.422 cm −1 , V 1 + V 4 -ranging from 1.797 to 1.799 cm −1 , V 1 + V 3 -ranging from 2.512 to 2.513 cm −1 and the single bands of further infra-red [46][47][48].…”

Section: The Results Of the Fourier Transform Infrared Spectroscopy (Ftir)mentioning

confidence: 99%

“…These carbonate phases were determined on the basis of the typical infra-red absorption bands for these minerals [21,24,[46][47][48] (Figures 9-12). Low magnesium calcite was identified on the basis of the infra-red bands with the following values: V 4 = 712 cm −1 , V 2 = 847 cm −1 , V 2 -ranging from 872 to 874 cm −1 , V 3 -ranging from 1.415 to 1.422 cm −1 , V 1 + V 4 -ranging from 1.797 to 1.799 cm −1 , V 1 + V 3 -ranging from 2.512 to 2.513 cm −1 and the single bands of further infra-red [46][47][48]. High magnesium calcite was determined based on the following typical phase absorption bands for this carbonate: V 3 = ranging from 1.426 to 1.435 cm −1 , V 1 + V 3 = 2.519 cm −1 and 2.626 cm −1 and the absorption bands of further infra-red that have the following values: 1.087 and 2.356 cm −1 [6,21,24,46,48,49].…”

Section: The Results Of the Fourier Transform Infrared Spectroscopy (Ftir)mentioning

confidence: 99%

“…Therefore, it can only be stated that high magnesium calcite is probably present in this sample. Dolomite was identified mainly on the basis of the typical absorption bands of further infra-red measurements for dolomite [21,22,24,[46][47][48] with the following values: 1.702 cm −1 , 2.360 to 2.368 cm −1 , 2.605 cm −1 and 2.868 cm −1 . Huntite was determined mainly on the basis of the single infra-red bands, the values for which are as follows: for sample G1-469 cm −1 and 800 cm −1 , for samples G6 (Figure 9) and S2-1555 cm −1 and for sample SO1-1562 cm −1 (Figure 11) [21,24,48].…”

Section: The Results Of the Fourier Transform Infrared Spectroscopy (Ftir)mentioning

confidence: 99%

“…The limestones sorbent that is usually used in flue gas desulfurization processes in power stations is built mainly of "pure", low magnesium calcite with contents of MgO < 2% [37][38][39][40][41][42][43]. During this process, gypsum is formed [44][45][46][47].…”

Section: Introductionmentioning

confidence: 99%

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The Use of Limestones Built of Carbonate Phases with Increased Mg Content in Processes of Flue Gas Desulfurization

Stanienda-Pilecki

2021

Minerals

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The purpose of this article was to present the theory of the possibility of using limestone sorbents containing carbonate minerals with increased Mg content in processes of flue gas desulfurization in power stations. Data obtained as a result of the conducted research show that the analyzed Triassic (Muschelkalk) limestones of the south-west part of Poland are built of the following carbonate minerals: low magnesium calcite, high magnesium calcite, dolomite and huntite. These carbonate minerals are characterized by various magnesium contents. The increased content of magnesium in the sorbent has a positive effect on the technological process of flue gas desulfurization using the dry method, especially in the case of desulfurization with the application of Fluidized Bed Reactors. The positive influence of magnesium’s presence in sorbent in the desulfurization process is connected with the decarbonization of carbonate phases with magnesium at temperatures similar to the dolomite decarbonization temperatures, which are, thus, lower than typical for low magnesium calcite. The process would be easier because the structure of a solid solution containing magnesium ions, with a smaller ion radius to calcium ions, is unstable and the decomposition of these phases runs easier and faster. Therefore, the desulfurization process starts earlier and is more effective.

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Section: The Results Of the Fourier Transform Infrared Spectroscopy (Ftir)mentioning

confidence: 99%

Section: The Results Of the Fourier Transform Infrared Spectroscopy (Ftir)mentioning

confidence: 99%

Section: The Results Of the Fourier Transform Infrared Spectroscopy (Ftir)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Use of Limestones Built of Carbonate Phases with Increased Mg Content in Processes of Flue Gas Desulfurization

Stanienda-Pilecki

2021

Minerals

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“…In addition, the neutralization of the electrolytes during HSAS removal should be considered. Therefore, a thermodynamic model that considers these response mechanisms used the electrolyte nonrandom two liquids (ELEC-NRTL) model with the Redlich-Kwong Equation 27 The ELEC-NRTL model is based on the fluidity equilibrium of liquid and steam, and it can handle a wide range of concentrations while processing water-soluble substances and mixed solvents. The Redlich-Kwong equation is used to determine the characteristics of the steam phase.…”

Section: Process Model For Cost Predictionmentioning

confidence: 99%

Techno‐economic comparison of amine regeneration process with heat‐stable amine salt reclaiming units

Lim

Lee

Moon

et al. 2021

Energy Science & Engineering

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Recently, the amount of sulfur compounds such as H 2 S generated in the oil-refining process has increased. 1,2 Removing such compounds from the process is essential because H 2 S is the main cause of air pollution and has a fatal effect on the human body. For example, at 0.0057 ppm in the atmosphere, H 2 S causes eye and nasal symptoms, coughs, and headaches; at 250 ppm, it can damage organs and nervous systems and also deflate cellular metabolism. 3 Therefore, H 2 S should be discarded to avoid environmental pollution and increase process efficiency. Most factories use amine gas sweetening to remove sulfur compounds such as H 2 S generated during the crude-oil refining process. 4 Amines that absorb H 2 S in the amine gas sweetening process are degraded using high temperature in the regenerator and reused; this is called the amine regeneration process. The H 2 S absorption and regeneration mechanism of amines is caused by a difference in pKa; it is absorbed

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Novel mechanical vapor recompression‐assisted evaporation process for improving energy efficiency in pulp and paper industry

Kim

Lim

Cho

et al. 2021

Intl J of Energy Research

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In the pulp and paper industry, black liquor, which is a biomass resource, is burned to produce electricity. Black liquor is concentrated to 21 wt% water through an evaporator before being burned in a boiler. For the evaporator, a multiple-effect evaporator (MEE) is mainly used, but it requires a large amount of energy and cost. Therefore, it is crucial to reduce energy and cost of evaporation process. Hence, this study suggested a novel process model that integrated mechanical vapor recompression (MVR) with MEE to increase the energy efficiency. The suggested MVR-assisted evaporation process was composed of preheating and evaporation processes to effectively concentrate black liquor. In addition, it reduced the steam consumption of MEE by using MVR, which uses relatively inexpensive electric energy in the pre-evaporation process. In the simulation results, the steam, electricity consumption, and the latent heat recovered from the secondary vapor of the suggested process were quantitatively analyzed to verify the energy efficiency. The results indicate that the proposed process increases substantial energy efficiency compared to the conventional process. Then, the appropriateness of the suggested process was evaluated by the techno-economic analysis. The total annualized cost (TAC) is determined for both current and potential future economic benefits. TAC of the MVR-assisted MEE configuration can be reduced by up to 77.54%.

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Optimization of wet flue gas desulfurization system using recycled waste oyster shell as high-grade limestone substitutes

Cited by 52 publications

References 22 publications

The Use of Limestones Built of Carbonate Phases with Increased Mg Content in Processes of Flue Gas Desulfurization

The Use of Limestones Built of Carbonate Phases with Increased Mg Content in Processes of Flue Gas Desulfurization

Techno‐economic comparison of amine regeneration process with heat‐stable amine salt reclaiming units

Novel mechanical vapor recompression‐assisted evaporation process for improving energy efficiency in pulp and paper industry

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