Simultaneous SO2/NOx removal by a powder-particle fluidized bed

Gao, Shiqiu; Nakagawa, Nobuyoshi; Katö, Kunio; Inomata, Makoto; Tsuchiya, Fujio

doi:10.1016/0920-5861(96)00002-8

Cited by 19 publications

(7 citation statements)

References 7 publications

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“…For NH 3 -SCR of NO x , fluidized bed reactors have been used for NO x or simultaneous SO x /NO x removal by various SO 2 sorbents and NH 3 -or urea-SCR catalysts (Snip et al, 1996;Gao et al, 1996;Roh et al, 2003). Compared to conventional monolithic reactors, the catalyst loading is decreased, fly ash can easily pass through and the gas/solid contact efficiency is enhanced in the fluidized bed reactor.…”

Section: Reactors For Scr Of No Xmentioning

confidence: 99%

Novel Fluidized Bed Reactor for Integrated NO_x Adsorption−Reduction with Hydrocarbons

Yang

2009

Environ. Sci. Technol.

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In order to avoid the negative impact of excessive oxygen in the combustion flue gases on the selectivity of most hydrocarbon selective catalytic reduction (HC-SCR) catalysts, an integrated NO(x) adsorption-reduction process has been proposed in this study for the treatment of flue gases under lean burn conditions by decoupling the adsorption and reduction into two different zones. The hypothesis has been validated in a novel internal circulating fluidized bed (ICFB) reactor using Fe/ZSM-5 as the catalyst and propylene as the reducing agent. Effects of propylene to the NO(x) molar ratio, flue gas oxygen concentration, and gas velocity on NO(x) conversion were studied using simulated flue gases. The results showed that increasing the ratio of HC:NO improved the reduction performance of Fe/ZSM-5 in the ICFB reactor. NO(x) conversion decreased with an increasing flue gas flow velocity in the annulus U(A) but increased with an increasing reductant gas flow velocity in the draft tube U(D). The NO(x) adsorption ratio decreased with increasing U(A). In most cases, NO(x) conversion was higher than the adsorption ratio due to the relatively poor adsorption performance of the catalyst. Fe/ZSM-5 showed a promising reduction performance and a strong inhibiting ability on the negative impact of excessive O2 in the ICFB reactor, proving that such an ICFB reactor possessed the ability to overcome the negative impact of excessive O2 in the flue gas using Fe/ZSM-5 as the deNO(x) catalyst.

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Section: Reactors For Scr Of No Xmentioning

confidence: 99%

Novel Fluidized Bed Reactor for Integrated NO_x Adsorption−Reduction with Hydrocarbons

Yang

2009

Environ. Sci. Technol.

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“…With the use of the so-called powder-particle fluidized bed (PPFB) originally developed by Kato et al, , a new combined DeSO x /DeNO x process has recently been proposed by some of the authors. − As conceptualized in refs and , a fine DeSO x sorbent, several to tens of micrometers in diameter, is continuously fed to a PPFB reactor in which a coarse DeNO x catalyst, several hundred micrometers in size, is fluidized with flue gas. Ammonia for NO x reduction is usually fed to the bottom of the reactor.…”

Section: Introductionmentioning

confidence: 99%

An Adaptive Sorbent for the Combined Desulfurization/Denitration Process Using a Powder-Particle Fluidized Bed

Luo

Akamatsu

et al. 2000

Ind. Eng. Chem. Res.

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This study is devoted to examining an adaptive sorbent for the combined desulfurization/denitration (DeSO x /DeNO x ) process reported in work by Xu et al. (Trans. Inst. Chem. Eng. 1999 , 77, Part B, 77−87). The so-called powder-particle fluidized bed (PPFB) is used by the process so that SO x in flue gas is absorbed by a continuously supplied fine DeSO x sorbent and NO x is reduced to N2 by ammonia under the catalysis of a coarse DeNO x catalyst, the fluidization medium particles (FMP). Experiments were conducted in a laboratory-scale PPFB reactor by using model flue gases containing SO2 and NO. It was found that the sodium carbonate supported by fine alumina particles (Na2CO3/Al2O3) had not only a high efficiency in absorbing SO2 but also little negative effect upon the simultaneous NO x reduction of the process. Using a DeNO x catalyst, such as V2O5·WO3/TiO2 or WO3/TiO2, to catalyze the DeNO x reactions, high SO2 absorption and NO reduction in excess of 95% were achieved for model gases free of CO2 at stoichiometric ratios of SO2 to sorbent (Na/S = 2.0) and NH3 to NO (NH3/NO = 1). As for the simulated flue gas SO2−NO−H2O−N2−air with an oxygen fraction of 2 vol % and a water vapor fraction of 5 vol %, such high removals of SO2 and NO were found available even in a shallow PPFB with a static catalyst packing height of 0.1 m. By using silica sand as FMP, the pure SO2 absorption by the sorbent Na2CO3/Al2O3 was also examined with respect to various influential factors, such as reaction temperature (523−673 K), flue gas composition (oxygen fraction and water vapor fraction), sorbent diameter, and operating conditions (gas velocity and FMP bed height).

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“…For dust removal, methods such as simple filtration, adsorption with solid sorbents [4,5] pulsed electron beam, reaction with negative ion [6] and electrostatic precipitation [7] have been reported. Among these de-dusting approaches, electrostatic precipitation has been widely used in industries and indoors [8].…”

Section: Introductionmentioning

confidence: 99%

Self-powered cleaning of air pollution by wind driven triboelectric nanogenerator

et al. 2015

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Simultaneous SO2/NOx removal by a powder-particle fluidized bed

Cited by 19 publications

References 7 publications

Novel Fluidized Bed Reactor for Integrated NO_x Adsorption−Reduction with Hydrocarbons

Novel Fluidized Bed Reactor for Integrated NO_x Adsorption−Reduction with Hydrocarbons

An Adaptive Sorbent for the Combined Desulfurization/Denitration Process Using a Powder-Particle Fluidized Bed

Self-powered cleaning of air pollution by wind driven triboelectric nanogenerator

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Simultaneous SO2/NOx removal by a powder-particle fluidized bed

Cited by 19 publications

References 7 publications

Novel Fluidized Bed Reactor for Integrated NOx Adsorption−Reduction with Hydrocarbons

Novel Fluidized Bed Reactor for Integrated NOx Adsorption−Reduction with Hydrocarbons

An Adaptive Sorbent for the Combined Desulfurization/Denitration Process Using a Powder-Particle Fluidized Bed

Self-powered cleaning of air pollution by wind driven triboelectric nanogenerator

Contact Info

Product

Resources

About

Novel Fluidized Bed Reactor for Integrated NO_x Adsorption−Reduction with Hydrocarbons

Novel Fluidized Bed Reactor for Integrated NO_x Adsorption−Reduction with Hydrocarbons