Effect of SO2 removal by limestone on NOx and N2O emissions from a bubbling fluidized-bed combustor

Shimizu, Tadaaki; Tachiyama, Yutaka; Kuroda, Ayumu; Inagaki, Makoto

doi:10.1016/0016-2361(92)90140-j

Cited by 32 publications

(27 citation statements)

References 2 publications

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“…However, the presence of Ca-sorbents in FBCs has been proved to affect the nitrogen chemistry in conventional combustion. The Ca-sorbent has a beneficial effect on reducing N 2 O emissions while the opposite trend is observed in the NO level [27][28][29]. The catalytic activity of a Ca-sorbent decreases during sulphation due to a loss in porosity and a lower activity of the CaSO 4 formed.…”

Section: Effect Of Addition Of Ca-sorbent and Type Of Sorbentmentioning

confidence: 99%

NO and N 2 O emissions in oxy-fuel combustion of coal in a bubbling fluidized bed combustor

Loscertales

Mendiara

Rufas

et al. 2015

Fuel

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Emissions from coal oxy-fuel combustion are receiving significant attention during the last years. This paper is focused on the analysis of fuel-N emissions in fluidized bed combustion systems. Experiments were carried out in a bubbling fluidized bed unit in the temperature interval 850-950ºC. Different coals (anthracite, bituminous and lignite) were used as fuels and different sorbents were employed for in-bed sulphur retention. In the experiments, NO, N 2 O and NO 2 were measured. NO 2 was not detected in any of the operating conditions. The influence of temperature on NO and N 2 O emissions was the same as in conventional combustion: NO emission increased as temperature increased while N 2 O emission decreased. Nevertheless, the total fuel-N conversion to nitrogenous species seemed to be lower than in combustion with air. As in air-firing combustion, the highest levels of NO and N 2 O were registered with the highest rank coals. The Ca-sorbent was found to have a key role on NO reduction via catalytic reaction and this catalytic effect seemed not to be affected by the high CO 2 levels present in oxy-fuel combustion. Also, the moisture content in the coal affected the NO formation, which decreased 2 with an increase in the coal moisture content. A similar effect was observed by increasing the oxygen concentration fed to the combustor.

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Section: Effect Of Addition Of Ca-sorbent and Type Of Sorbentmentioning

confidence: 99%

NO and N 2 O emissions in oxy-fuel combustion of coal in a bubbling fluidized bed combustor

Loscertales

Mendiara

Rufas

et al. 2015

Fuel

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“…Ethyl silicate is clearly seen that it decreases with strength in both cases. This may be attributed to that Ethyl silicate is react with limestone itself forming a brittle tough material which cannot withstand the compressive load [28,29]. …”

Section: Compressive Strengthmentioning

confidence: 99%

Protection of Limestone Coated with Different Polymeric Materials

Abdellah¹,

Gelany²,

Mohamed³

et al. 2017

AJME

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The uniaxial compressive strength is an important parameter in selecting and design of rock and brittles structure. Protection of ancient monuments or historic structure has a great intense in material science point of view. Limestone is commonly rock material which has a great sense in historical buildings and temples. The strength of this material may be influenced by natural weathering like moisture, rains and varying temperature. Samples of ancient limestone rock are coated with Paraloid B44, Paraloid B72, ethyl silicate and Wacker OH100. The results concluded that both Wacker OH100 and Paraloid B44 coating material have more efficient and give considerable protection when the sample is immersed in salinity water for a week. The compressive strength of limestone decreases due to water action. Water absorption, porosity, and rock density are enhanced with the coating process.

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“…Stevns Chalk is a geologically young porous and soft limestone with a high sulfur capture capacity, whereas the other limestones are relatively soft, geologically young limestones with an intermediate sulfur capture capacity. Chichibu limestone (7) was used in an earlier study of limestone catalyzed HCN oxidation by Shimizu et al (1992.…”

Section: Experimental Studiesmentioning

confidence: 99%

“…Calcined limestone has been reported to be an effective catalyst for oxidation of HCN (de Soete and Nastoll, 1991;Shimizu et al, 1992Shimizu et al, , 1994, and the reported selectivity for NO formation is typically in the range 40-70% when the 0, concentration is above 5,000 ppmv. There is agreement that the selectivity for N,O formation is low, less than 10%.…”

Section: Introductionmentioning

confidence: 96%