Fluidized-bed incineration of waste materials

Saxena, S.C.; Jotshi, C.K.

doi:10.1016/0360-1285(94)90012-4

Cited by 101 publications

(31 citation statements)

References 69 publications

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“…FA2 contains more non-metallic elements such as S, Cl; however, FA6 contains more metallic elements such as Al, Mg, and Fe. Among the mineral compositions, CaO is usually used as the additive for SO x removal in the incineration system (Bodénan and Deniard, 2003), and the addition of SiO 2 used as bed material in FBI (Saxena and Jotshi, 1994;van Caneghem et al, 2012) weakens the pore structure of the fly ash surface. The smaller particle, more crushed surface, and less micropores of FA2 are as shown in Fig.…”

Section: 14mentioning

confidence: 99%

生活垃圾焚烧残灰中有毒成分的排放特性

Ren

et al. 2015

J. Zhejiang Univ. Sci. A

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Abstract:In this study, eight fly ash samples and three bottom ash samples from different areas are collected for analysis of their physicochemical properties and emission content of dioxin precursors and metals. Their surface characteristics, their effects on dioxin precursors, and important aspects of the compositions of residual ash (fly ash and bottom ash) are investigated. Poly-chlorobenzenes (PCBzs) in the fly ash of a fluidized bed incinerator (FBI) are 7.35 to 357.94 µg/kg, and in that of a fire grate incinerator (FGI) are 6.74 to 96.52 µg/kg. The concentrations in bottom ash are the same (i.e., 2.23 to 2.99 µg/kg) regardless of the furnace type. The concentrations of polycyclic aromatic hydrocarbons (PAHs) in FGI fly ash samples (0.293 to 1.783 mg/kg) are less than these in samples from FBIs (1.820 to 38.012 mg/kg). Low boiling point PAHs (mainly 2-and 3-ringed PAHs) and high boiling point PCBzs (mainly H x CB and P e CBz) are the major constituents of residual ash. Different distributions of PCBzs and PAHs are mainly dictated by the incineration characteristics of FBI and FGI. Al and Fe, as non-toxic "light metals" are the major constituents of the residual ash, and Ni and Zn as non-toxic heavy metals play important roles in the total heavy metal. Cu, Pb, and Cr are the three major toxic heavy metals. The correlation of the metals and the dioxin precursors is discussed and distinguished.

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Section: 14mentioning

confidence: 99%

生活垃圾焚烧残灰中有毒成分的排放特性

Ren

et al. 2015

J. Zhejiang Univ. Sci. A

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“…In this context, Saxena and Jotshi [14] reported SOx and NOx values in the range of 20-35 ppm and 100-139 ppm, respectively. The EIC and EPI prototypes showed SOx concentrations of 350 ppm and NOx concentrations of 35 ppm.…”

Section: Resultsmentioning

confidence: 98%

“…In a fluidized-bed incinerator at pilot scale, Saxena and Jotshi [14] reported that oxygen concentrations in the flue gas should be ranging between 13.4 and 16.1%; Swithenbank et al [15] determined an optimum oxygen concentration of 16.9% during the incineration of clinical waste. Previous works on this field have also found that commercial incinerators were operated under similar excess oxygen conditions.…”

Section: Resultsmentioning

confidence: 99%

“…During the operation of a fluidized bed incinerator at pilot plant scale, Saxena and Jotshi [14] reported SO x and NOx emissions ranging from 20 to 35 ppm and 100 to 139 ppm respectively, having oxygen concentrations in the flue gases between 13.4 and 16.1%. Swithenbank et al [15] found an oxygen concentration of 16.9% in the flue gas of clinical wastes.…”

Section: Introductionmentioning

confidence: 99%

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Combustion of lignocellulosic materials in an experimental fluidized bed system

López-Ocaña

Bautista-Margulis

Hernandez-Barajas

et al. 2008

WIT Transactions on Ecology and the Environment

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Incineration via fluidized bed combustion is a worldwide technology used for the thermal treatment of solid wastes with various calorific values. The objective of the present investigation was to evaluate the combustion efficiency and gas products from a three-phase combustor in order to thermally treat lignocellulosic materials obtained from urban solid wastes generated in Villahermosa-Tabasco, Mexico. The experiments were carried out in three sections: (EXP-1) the bed temperature (Tb) was varied from 800 to 900°C, having a static bed height (Hs) of 0.15 m; (EXP-2); same Tb range but Hs = 0.20 m; (EXP-3) same Tb range but Hs = 0.25 m. Throughout the experiments, the combustor was operated with an average excess air (XSA) of 168% and a mean bed particle size (Dp) of 0.8 mm. The results revealed that the combustion efficiency varied from 73.6-82.6% for Hs = 0.15 m, 78.4-87.9% for Hs = 0.20 m, and 80.1-90.6% for Hs = 0.25 m. At Tb < 815°C and Hs = 0.15 m, low combustion efficiencies were obtained (73-80%), with relatively high CO emissions (280-310 ppm). At Tb > 850°C and Hs = 0.20-0.25 m, higher combustion efficiencies were attained (82-91%), with maximum emission concentrations of CO (102 ppm), SO 2 (13 ppm) and NO x (17 ppm) that never exceeded the maximum permissible levels established in the current Mexican environmental legislation. The prototype probed to be technically and environmentally feasible for the treatment of lignocellulosic materials via fluidized bed combustion.

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“…Pored toga, fluidizaciono lo`i{te mo`e da radi na ni`im temperaturama (»850 °C) koje su optimalne sa aspekta smawene koncentracije NO x jediwewa u dimnim gasovima. Tako|e, ova lo`i{ta su povoqna i sa aspekta efikasnosti odsumporavawa kre~wakom u samom lo`i{tu [1], kada je to neophodno. Zbog svega navedenog ova tehnologija je preporu~ena od strane EU za sagorevawe otpadnih materija.…”

Section: Uvodunclassified

Fluidized combustion chamber CFD simulation based on Euler-Euler granular flow model

Nemoda¹,

Mladenović²,

Erić³

et al. 2014

Termotehnika

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UvodReaktori na bazi mehurastog gas-~vrste ~estice fluidizovanog sloja (FS) se koriste u mnogim industrijskim operacijama, kao {to su proizvodwa energije i petrohemijski procesi, U posledwe vreme ovi reaktori se sve ~e{}e primewuju za potrebe termi~ke dezintegracije (insineracije) nepotrebnih i otpadnih industrijskih produkata, Prednosti sagorevawa nekonvencionalnih goriva (sa visokim sadr`ajem vode i drugih balastnih materija) u fluidizovanom sloju su S. \. Nemoda i dr.: CFD numeri~ka simulacija fluidizacione komore

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Fluidized-bed incineration of waste materials

Cited by 101 publications

References 69 publications

生活垃圾焚烧残灰中有毒成分的排放特性

生活垃圾焚烧残灰中有毒成分的排放特性

Combustion of lignocellulosic materials in an experimental fluidized bed system

Fluidized combustion chamber CFD simulation based on Euler-Euler granular flow model

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