The role of MgO in the binding of SO2 by lime-containing materials

Kaljuvee, Tiit; Trikkel, Andres; Kuusik, Rein; Bender, V. E.

doi:10.1007/s10973-005-0699-1

Cited by 22 publications

(10 citation statements)

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“…During a 2-min contact, PF/BA bound 58%, while PF/ESPA1 and PF/CA only 33% of the total amount of bound sulphur dioxide. This data correspond to the data obtained in our earlier research (Kaljuvee et al [13,14]) and can be explained by the differences in chemical and fractional composition as well as in physical and chemical properties of the ashes. Thus, CFBC/BA and CFBC/INT have coarser fractional composition and lower SSA level, but higher free CaO content, while CFBC/ESPA has fine fractional composition (and high level of SSA), but low content of free CaO (see Table 1 In the experiments of SO 2 -binding MgO, free CaO and, partially, Ca-silicates can take part in the reactions with SO 2 .…”

Section: Transformations In the Gas-solid System So 2 -Ashsupporting

confidence: 91%

“…Although MgO does not take part in CO 2 binding under these conditions [13], it has a certain role in SO 2 binding (Kaljuvee et al [13,14]). Hence, the negative influence of coarser fractional composition of the samples and, correspondingly, the lower level of specific surface area (SSA) in the case of, for example, CFBC/BA (mean particle size 197 µm; SSA 2.1 m 2 /g) and CFBC/INT (95 µm; 2.6 m 2 /g) should be compensated by higher level of free CaO content -11.9 and 18.9%, respectively (see Table 1).…”

Section: Resultsmentioning

confidence: 99%

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Reuse of waste ashes formed at oil shale based power industry in Estonia

Kuusik¹,

Uibu²,

Trikkel³

et al. 2006

WIT Transactions on Ecology and the Environment, Vol 92

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Estonian oil shale belongs to low-grade fossil fuels and by its combustion huge quantities of ash (currently about 5 million tons annually) are formed. Since 1959 pulverized firing (PF) has been used, and circulating fluidized bed combustion (CFBC) technology has recently been implemented -two units each of 215 MW capacity are in operation. In previous investigations of PF ashes the results have been used as a basis for several large-scale applications like production of construction materials and conditioning/neutralizing of soils; a developing of industrial applications for CFBC ashes is hindered by insufficient basic data. In the current investigation attention was focused on the reactivity of ashes towards SO 2 and CO 2 in heterogeneous gas -solid and gas -water -solid systems, being important for characterization of ashes as sorbents for the capture of acidic gases named from flue gases. The significant differences in chemical and phase composition as well as in surface properties of ashes have been shown. The SO 2 -binding characteristics for CFBC ashes are higher than for PF ashes and they have more perspective as dry sorbents of sulphur dioxide. Also, under wet carbonization conditions, CFBC ashes can be carbonized more deeply as compared to PF ashes. As a result of carbonation, ashes could be environmentally friendly landfilled and abatement of CO 2 emissions will be achieved.

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Section: Transformations In the Gas-solid System So 2 -Ashsupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Reuse of waste ashes formed at oil shale based power industry in Estonia

Kuusik¹,

Uibu²,

Trikkel³

et al. 2006

WIT Transactions on Ecology and the Environment, Vol 92

Self Cite

View full text Add to dashboard Cite

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“…This was due to a specific grain structure for the calcined material, which means a larger pore surface area for sulfur retention (Martin, 1981;Watanabe et al, 1993;Zhang et al, 1992, in: Santana et al, 1998. However, by comparing limestones of different chemical compositions, it is not easy to understand why apparently contradictory results are found in the literature, i.e., sometimes a dolomite is better than a calcitic limestone, and sometimes the opposite was found (Montagnaro et al, 2002;Kaljuvee et al, 2005;Laursen et al, 2000). This is also more complicated when comparing data obtained from dynamic and static experimental conditions.…”

Section: Introductionmentioning

confidence: 98%

FBC desulfurization process using coal with low sulfur content, high oxidizing conditions and metamorphic limestones

Bragança

Castellan

2009

Braz. J. Chem. Eng.

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-A metamorphic limestone and a dolomite were employed as SO 2 sorbents in the desulfurization of gas from coal combustion. The tests were performed in a fluidized bed reactor on a bench and pilot scale. Several parameters such as bed temperature, sorbent type, and sorbent particle size at different Ca/S molar ratios were analyzed. These parameters were evaluated for the combustion of coal with low-sulfur/high-ash content, experimental conditions of high air excess and high O 2 level in fluidization air. Under these conditions, typical of furnaces, few published data can be found. In this work, a medium level of desulfurization efficiency (~60%) for Ca/S = 2 was obtained.

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“…Depending on the experimental conditions and/or limestone origin, the efficiency of desulfurization may change. It is possible to find experimental results in which calcitic and dolomitic limestones change places as being indicated as the best sorbent (Montagnaro, 2010;Kaljuvee, 2005;Laursen, 2000;De Diego, 2013a). A dolomite showed superior performance as sorbent for CO2 capture in a postcombustion system due to higher MgO resistance to sintering that stabilizes CaO structure (Valverde, 2015).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Limestone Impurities in the Desulfurization Process of Coal Combustion Gas

Souza

Bragança

2017

Braz. J. Chem. Eng.

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-Limestones have been used to capture SO2 emitted during the combustion of coal for decades. However, due to the complexities of the variables involved in this process, many issues are still being studied. Some tests were performed in a fluidized bed reactor, which was used to evaluate the performance of the limestones in the bed for flue gas desulfurization, burning low sulfur coal. Metamorphic dolomitic limestones of low cost were evaluated considering the impurity level and need for beneficiation. They were characterized chemically, physically and microstructurally (X-ray fluorescence, X-ray diffraction, laser particle size analyzer, scanning electronic microscope). The data obtained were compared to a calcitic limestone of elevated purity and higher market value. The results showed little effect of the major impurities present in the dolomitic limestones in the calcination and desulfurization processes. Microcrystalline impurities showed a marked effect promoting grain sintering in calcination conditions of TGA/DTA tests in different atmospheres, as shown in SEM images. Dolomitic limestones generate more solid waste and capture less SO2 per kcal (a slightly decrease in the thermal efficiency of the reactor) compared to calcitic limestones. However, due to the lower cost, they were considered to be attractive for the FBC process (2 mg SO2/kcal at Ca/S=3).

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The role of MgO in the binding of SO2 by lime-containing materials

Cited by 22 publications

References 0 publications

Reuse of waste ashes formed at oil shale based power industry in Estonia

Reuse of waste ashes formed at oil shale based power industry in Estonia

FBC desulfurization process using coal with low sulfur content, high oxidizing conditions and metamorphic limestones

Evaluation of Limestone Impurities in the Desulfurization Process of Coal Combustion Gas

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