Partitioning behavior of Arsenic in circulating fluidized bed boilers co-firing petroleum coke and coal

Duan, Lunbo; Cui, Jian; Jiang, Ying; Zhao, Changsui; Anthony, Edward J.

doi:10.1016/j.fuproc.2017.05.003

Cited by 28 publications

(3 citation statements)

References 46 publications

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“…Zhu et al ( 2009 ) studied the emission characteristics of trace elements Hg, Pb, Ni, Cr, Cu, and Zn in the co-combustion process of petrochemical sludge and coal on a 0.2MW pilot-scale circulating fluidized bed experimental bench, and found that when the mass ratio of petrochemical sludge to coal increased from 10 to 40%, Hg and Zn emissions increased, while Pb and Ni emissions decreased. Duan et al ( 2017 ) studied the distribution rule of arsenic during the co-processing of petroleum coke by three 440 t/h circulating fluidized bed boilers, and found that As mainly exists in electrostatic dust removal and bag dust removal, accounting for 17.4 to 37.5% and 55.6 to 77.5%, respectively. Morphological analysis shows that As 5+ is the main water-soluble substance in the incoming fuel, bottom ash, and fly ash, while As 3+ is the main water-soluble substance in wet flue gas desulfurization (WFGD) wastewater.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of migration and speciation of trace elements during co-processing of antibiotic residues in a circulating fluidized bed

Xiao

Yan

et al. 2021

Environ Sci Pollut Res

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In order to study the emission characteristics of the products during the blending of antibiotic residues in coal-fired power plants, blending tests were performed on a 140 t/h circulating fluidized bed boiler. It was found that during combustion, 64 to 87.6% of Cr, As, and Pb are concentrated in the fly ash, and 11.4 to 35% are concentrated in the bottom ash. Only a small amount of these elements are captured by the desulfurization system or enter the environment. During the material distribution of the desulfurization system, trace elements are mostly concentrated in gypsum. In the desulfurization system, the proportion of Cr, As, Pb, Be, Mn, Co, Ni, Se, and Mo in the gypsum range from 82.8 to 99.9%, and the content has reached the level of ppm. When the blending ratio is controlled within 7%, the blending of antibiotic residues has little effect on the elemental composition of coal. The contents of Cr, Ni, Cu, Zn, and Ba in the products increased by 9.5 to 22.3%. This may mean when the blending ratio is increased, it will be harmful to the environment.

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Section: Introductionmentioning

confidence: 99%

Characteristics of migration and speciation of trace elements during co-processing of antibiotic residues in a circulating fluidized bed

Xiao

Yan

et al. 2021

Environ Sci Pollut Res

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“…Due to the advantages of homogenous mixing, high heat and mass transfer rate and easy control, fluidized bed is applied in various industrial fields, such as petroleum, chemical and energy processes (Van Der Hoef et al 2006). For example, circulating fluidized bed boiler is widely adopted for the co-firing of petroleum coke and coal (Chen and Lu 2007;Duan et al 2017;Cui et al 2018). In actual industrial processes, inert particles such as sand are often added to the bed to assist the fluidization and promote the heat and mass transfer.…”

Section: Introductionmentioning

confidence: 99%

Particle velocity measurement of binary mixtures in the riser of a circulating fluidized bed by the combined use of electrostatic sensing and high-speed imaging

et al. 2020

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The flow dynamics of binary particle mixtures in the fluidized bed needs to be monitored in order to optimize the related industrial processes. In this paper, electrostatic sensing and high-speed imaging are applied to measure the velocities of polyethylene and sand particles in the binary particle mixtures in fluidization. Experimental studies were conducted on a lab-scale cold circulating fluidized bed. Correlation function between electrostatic signals from upstream and downstream electrodes placed along the riser shows two peaks that represent transit times for the two types of particles. To verify the above results, high-speed imaging was adopted to capture the flow images of particle mixtures. Particle Image Velocimetry and Particle Tracking Velocimetry algorithms were utilized to process the resulted images in order to measure the velocities of polyethylene and sand particles. The reasons for two-peak correlation functions are illustrated based on the frequency spectrums of the mono-solid-phase electrostatic signals and the velocity difference between polyethylene and sand particles. Finally, comparisons on the velocities obtained from electrostatic sensing and high-speed imaging demonstrate the electrostatic sensor can roughly estimate the particle velocity of binary particle mixtures in the near wall region of the circulating fluidized bed. Keywords Binary mixtures • Fluidized bed • Electrostatic sensor • High-speed imaging Abbreviations ADC Analog to digital converter BFB Bubbling fluidized bed CFB Circulating fluidized bed DCC Direct cross-correlation ECT Electrical capacitance tomography FFT Fast fourier transform PE Polyethylene PIV Particle image velocimetry PTV Particle tracking velocimetry RPT Radioactive particle tracking List of symbols C(d) Cross-correlation coefficient f(x, y) Gray distribution of the binary image L Distance between the upstream and the downstream electrodes, m m pq 2-D moment of order (p + q) n Strictness of the filter S 1 (z 1, t) Upstream electrostatic signals, V S 2 (z 2, t) Downstream electrostatic signals, V S PE (t) Components from PE particles, V S sand (t) Components from sand particles, V T Integral time, s t lower Lower velocity threshold, m/s t upper Upper velocity threshold, m/s u Mean velocity, m/s x X coordinates of the centroid y Y coordinates of the centroid Edited by Xiu-Qiu Peng

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“…4 During coal combustion, As and Pb are partially present in the bottom slag and fly ash, and the rest is released into the flue gas during combustion. 5 Most of the As and Pb in the fly ash are removed by a dust removal device, 6 while the As and Pb present in ultrafine particles and the gaseous phase are released into the atmosphere with the flue gas. Thus, the transformation of As and Pb during coal combustion is very important for the development of control technology.…”

Section: Introductionmentioning

confidence: 99%

Transformation Characteristics of Arsenic and Lead during Coal Combustion

Song

et al. 2019

Energy Fuels

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The study of the transformation of heavy metals during the coal combustion process is of great significance to controlling their emission. In this study, three coals with different contents of arsenic (As), lead (Pb), and mineral elements were selected. The experiments were conducted at 900−1300 °C using a drop tube furnace system. The transformation of As and Pb during the combustion processes of the three coals was obtained. It was found that both the gaseous and particulate phases were important forms of As and Pb in the combustion products. As the temperature increased, the proportion of gaseous-phase As of the YBS (Yuan Baoshan) coal and JT (Jing Tai) coal first increased and then decreased, and the proportion of gaseous-phase As of the HLH (Huo Linhe) coal increased slightly. As the temperature increased, the proportion of gaseousphase Pb of the three coals increased and reached approximately 65% at 1300 °C. For the particulate phase, As and Pb were mainly present in ultramicrometer particles after combustion. The differences in the three coal components caused the different distributions of As and Pb in the gaseous and solid combustion products. The coal with a high content of iron (Fe) and calcium (Ca) was more conducive to the migration of gaseous-phase As to solid-phase As during flue gas cooling, while the effects of Ca and sulfur (S) on Pb transformation in the coal were offset. The original modes of occurrence of As and Pb in the three coals were mainly organic-bound and residual forms. During the combustion process, the organic-bound As and Pb were completely released, the residual As and Pb were partially released, and small amounts of water-soluble and ion-exchangeable As and Pb were formed. The analysis of the distribution characteristics of As and Pb in the combustion products showed that the direct release ratios of As and Pb during high-temperature combustion were greater than 45%. During flue gas cooling, more than 60% of As and Pb in the submicrometer particle were produced by transformation from the gaseous phase to particulate phase.

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Partitioning behavior of Arsenic in circulating fluidized bed boilers co-firing petroleum coke and coal

Cited by 28 publications

References 46 publications

Characteristics of migration and speciation of trace elements during co-processing of antibiotic residues in a circulating fluidized bed

Characteristics of migration and speciation of trace elements during co-processing of antibiotic residues in a circulating fluidized bed

Particle velocity measurement of binary mixtures in the riser of a circulating fluidized bed by the combined use of electrostatic sensing and high-speed imaging

Transformation Characteristics of Arsenic and Lead during Coal Combustion

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