The effect of circulating fluidized bed boiler load on the emission of mercury

Wichliński, Michał; Wielgosz, Grzegorz; Kobyłecki, Rafał

doi:10.1016/j.joei.2018.12.002

Cited by 7 publications

(2 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The mercury balance was calculated under all working conditions, and the mercury balance calculation results are between 100 and 104%. By comparing with the relevant literature, we can see that all the data are in a reasonable and reliable range. − The difference between Hg 0 input and Hg 0 output is Hg 2+ . , Wet flue gas (WFG) is used to represent 70% CO 2 + 6% O 2 + 200 ppm of NO + 40 ppm of HCl + 300 ppm of SO 2 + H 2 O. Simulated flue gas (SFG) is used to represent 70% CO 2 + 6% O 2 + 200 ppm of NO + 40 ppm of HCl + 300 ppm of SO 2 .…”

Section: Methodsmentioning

confidence: 88%

Experimental and Kinetic Analysis of H₂O on Hg⁰ Removal by Sorbent Traps in Oxy-combustion Atmosphere

Wang

Shen

et al. 2021

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Oxy-combustion technology is under development for CO2 capture. H2O could influence the Hg0 removal by sorbent traps in an oxy-combustion atmosphere. A study of the effects of H2O on Hg0 removal by biomass char under oxy-combustion conditions is presented in this paper. The kinetic model analysis was conducted to study the adsorption process of Hg0, which included a pseudo-first-order kinetic model, a pseudo-second-order kinetic model, and intraparticle diffusion kinetic model. Experimental results showed that a low-level of H2O had a promoting effect on the adsorption of Hg0, and high-level of H2O had an inhibiting effect. A high concentration of H2O would form a water film on the surface of sorbent traps to hinder the removal of external mass transfer on Hg0. Although the adsorption rate of Hg0 depended both on external mass transfer and intraparticle diffusion, external mass transfer was a more important controlling factor. It was found that physical adsorption was one of the main forms of Hg0 removal on the surface of sorbent traps, owing to the large specific surface area and good pore structure of the modified corn straw char. The removal of Hg0 was mainly attributed to capture by physical adsorption and the formation of HgO by chemisorption.

show abstract

Section: Methodsmentioning

confidence: 88%

Experimental and Kinetic Analysis of H₂O on Hg⁰ Removal by Sorbent Traps in Oxy-combustion Atmosphere

Wang

Shen

et al. 2021

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…In recent twenty years, CFB boilers have been rapidly employed in coal-fired power plants due to their excellent fuel flexibility, low NOx emission, high sulfur capture efficiency and so on [24]. Wichlinski et al [25] reported that very high Hg content was determined in the fly ash collected from a CFB boiler unit. Wang et al [26] obtained nearly 100% gaseous Hg removal in a CFB boiler unit, compared to only 27.56% or 33.59% Hg removed in two PC boiler units.…”

Section: Introductionmentioning

confidence: 99%

Mercury Migration Behavior from Flue Gas to Fly Ashes in a Commercial Coal-Fired CFB Power Plant

et al. 2020

View full text Add to dashboard Cite

Mercury (Hg) emissions from coal-fired power plants are of increasing concern around the world. In this study, field tests were carried out to understand the Hg emission characteristics and its migration behaviors in a commercial CFB boiler unit with the electricity generation capacity of 25 MW. This boiler is equipped with one electrostatic precipitator (ESP) and two fabric filters (FFs) in series for removing particulates from the flue gas. The EPA 30B method was used for simultaneous flue gas Hg sampling at the inlet of the ESP and the outlet of the second FF. The Hg mass balance in the range of 104.07% to 112.87% was obtained throughout the CFB unit by measuring the Hg contents in the feed fuel, the fly ash and the bottom ash, as well as in the flue gas at the outlet of the particulate control device (PCD) system. More than 99% of Hg contained in the feed fuel was captured by the fly ash, whilst less than 1% of Hg was remained in the bottom ash or the flue gas after passing the PCD system. The gaseous Hg obviously migrated from the flue gas to the fly ash in the air pre-heater, where the flue gas temperature decreased from 250 °C at the inlet to 120 °C at the outlet. Other gaseous Hg migrated from the flue gas to the fly ash in the PCD system, as the Hg concentrations in the flue gas ranged from 3.14 to 4.14 μg/m3 at the inlet of the ESP and ranged from 0.30 to 0.36 μg/m3 at the outlet of the second FF. The average Hg contents in the fly ash samples collected from the ESP, the first FF and the second FF were 912.3, 1313.6 and 1464.9 ng/g, respectively, while the mean particle diameters of these fly ash samples tend to decrease along the flow pass in the PCD system. Compared to large fly ash particles, smaller fly ash particles exhibit higher Hg capture performance due to their high unburned carbon (UBC) content and large specific surface area. The migration of gaseous Hg from the flue gas to the fly ash downstream of the CFB boiler unit was easier than that downstream of the PC boiler unit due to high UBC content and specific surface area.

show abstract

Mercury content in woody biomass and its removal in the torrefaction process

Dziok

Kołodziejska

2020

Biomass and Bioenergy

View full text Add to dashboard Cite

The effect of circulating fluidized bed boiler load on the emission of mercury

Cited by 7 publications

References 14 publications

Experimental and Kinetic Analysis of H₂O on Hg⁰ Removal by Sorbent Traps in Oxy-combustion Atmosphere

Experimental and Kinetic Analysis of H₂O on Hg⁰ Removal by Sorbent Traps in Oxy-combustion Atmosphere

Mercury Migration Behavior from Flue Gas to Fly Ashes in a Commercial Coal-Fired CFB Power Plant

Mercury content in woody biomass and its removal in the torrefaction process

Contact Info

Product

Resources

About

The effect of circulating fluidized bed boiler load on the emission of mercury

Cited by 7 publications

References 14 publications

Experimental and Kinetic Analysis of H2O on Hg0 Removal by Sorbent Traps in Oxy-combustion Atmosphere

Experimental and Kinetic Analysis of H2O on Hg0 Removal by Sorbent Traps in Oxy-combustion Atmosphere

Mercury Migration Behavior from Flue Gas to Fly Ashes in a Commercial Coal-Fired CFB Power Plant

Mercury content in woody biomass and its removal in the torrefaction process

Contact Info

Product

Resources

About

Experimental and Kinetic Analysis of H₂O on Hg⁰ Removal by Sorbent Traps in Oxy-combustion Atmosphere

Experimental and Kinetic Analysis of H₂O on Hg⁰ Removal by Sorbent Traps in Oxy-combustion Atmosphere