A study of chlorine behavior in a simulated fluidized bed combustion system

Liu, K.; Pan, Wenxiao; Riley, John T.

doi:10.1016/s0016-2361(99)00247-1

Cited by 84 publications

(89 citation statements)

References 15 publications

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“…Hence, fewer ringed PAHs (2-and 3-ringed PAHs) were the major constituent in FGI and FBI residual ashes (both with their furnace cavity temperature higher than 800 °C). However, the higher temperature in FBI furnace cavity (Liu et al, 2000;Weber et al, 2001) could reduce the proportions of 2-and 3-ringed PAHs by further breaking them down to some organic fragments (Bauschlicher and Ricca, 2000;Liu et al, 2001). The special case of FA5 and FA8 may be caused by the fluctuation of the furnace operating load, reflected in their very high PAHs emission amounts.…”

Section: Emission Characteristics Of Pahs In Mswi Residual Ashmentioning

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: Emission Characteristics Of Pahs In Mswi Residual Ashmentioning

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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“…The gases eluted from the furnace were collected into three traps with impingers. The amounts of chlorine and sulfur absorbed by Ca(OH) 2 were determined by measuring the concentrations of Cl -and SO 4 2-ions trapped in impingers using Ion Chromatography (Dionex DX320IC).…”

Section: Methodsmentioning

confidence: 99%

“…The simultaneous absorption of SO 2 and HCl by Ca-based absorbents in hot flue gases has been reported in several publications. Using thermogravimetric experiments, Matuskata et al [2] and several researchers [3][4][5][6] reported that the coexistence of HCl with SO 2 significantly increased the conversion rate of CaO to CaSO 4 at 750°C.…”

Section: Introductionmentioning

confidence: 99%

“…Xie et al [3] and Liu et al [4] suggested that HCl could promote conversion of SO 2 to SO 3 , because SO 3 is more easily absorbed by limestone than SO 2 during fluidized bed combustion. Matsukata et al [2] and Partanen et al [5] also suggested that melting an eutectic mixture of CaCl 2 and CaSO 4 might heavily promote SO 2 absorption in cases of simultaneous absorption of HCl and SO 2 due to the formation of voids playing a role of the diffusion paths for HCl and SO 2 toward the interior of the absorbing particle.…”

Section: Introductionmentioning

confidence: 99%

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Absorption behavior of chlorine and sulfur by Ca(OH)2 under simulated conditions with a fluidized bed combustor

Kwak

Lee

Bae

et al. 2011

J Mater Cycles Waste Manag

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This study was carried out to investigate the absorption reaction of chlorine and sulfur with Ca(OH) 2 under simulated conditions related to the co-combustion of refuse-derived fuel and sewage sludge in the fluidized bed combustor, such as high temperature, moisture and a mixing of samples. The combustion experiments were carried out in an electrical furnace with PVC and sulfur powders as the waste samples. High-purity slaked lime powder was used to capture the chlorine and sulfur. The experimental results showed that the removal efficiencies of both chlorine and sulfur were over 90% when the mole ratios of Ca on Cl and S were over 2.5. Furthermore, simultaneous absorption was helpful in improving the removal efficiency of chlorine and sulfur. The presence of chlorine markedly increased the removal efficiency of sulfur. The removal efficiency of chlorine was the highest at 700°C in both independent and simultaneous absorption. The removal efficiency of sulfur increased as the temperature increased, but the removal efficiency of chlorine sharply decreased from 95 to 83% when the moisture content in gases increased from 0 to 20 vol%. These results were confirmed by the combustion test of granular CaCl 2 .

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“…With the increase of combustion temperature, the amount of chlorine released in the form of emissions increases and at the same time the amount of chlorine present in the slag and ashes decreases. Data on the speciation of chlorine in the combustion process at different temperatures according to the work of Liu (Liu et al, 2000) are shown in Table 6 Presence of chlorine Table 6. Speciation of chlorine in the combustion process depending on the temperature…”

Section: Hydrogen Chloride Emissionmentioning

confidence: 99%

Pollutant Formation in Combustion Processes

Wielgosiński¹

2012

Advances in Chemical Engineering

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A study of chlorine behavior in a simulated fluidized bed combustion system

Cited by 84 publications

References 15 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

Absorption behavior of chlorine and sulfur by Ca(OH)2 under simulated conditions with a fluidized bed combustor

Pollutant Formation in Combustion Processes

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