Mercury Behavior and Retention in Oxy-fuel Combustion

Yang, Jianping; Zhao, Yongchun; Zhang, Junying; Zheng, Chenghang

doi:10.1016/b978-0-12-812145-0.00007-4

Cited by 3 publications

(3 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Mitsui et al 10 found that the Hg concentration was higher under an oxy-fuel atmosphere than that under an air atmosphere at the selective catalytic reduction (SCR) inlet through the experiments on Babcock−Hitachi's 1.5 MW th combustion condition. By the thermodynamic modeling, Yang et al 11 concluded that the primary mercury species was Hg 0 under an oxy-fuel atmosphere. Our recent studies also indicated that the Hg 2+ percentage was higher under an oxy-fuel atmosphere compared to that under an air atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Activated Carbon for Capturing Hg in Flue Gas under O₂/CO₂ Combustion Conditions. Part 1: Experimental and Kinetic Study

Wang

Duan

et al. 2018

Energy Fuels

View full text Add to dashboard Cite

This study evaluated the mercury sorption by activated carbon (AC) under an O2/CO2 atmosphere in a fixed-bed reactor. Effects of the oxygen concentration on the mercury sorption efficiency under both air and oxy-fuel atmospheres were explored. The kinetic studies were also used to predict the mercury sorption process by the pseudo-first-order model and the intraparticle diffusion model in this work. The experimental results indicated that the mercury sorption capacity of AC increased with the increased oxygen concentration under both air and oxy-fuel atmospheres. Oxygen might increase the oxidation of mercury by the Mars–Maessen way. A high CO2 concentration promoted AC to generate more active sites under an oxy-fuel atmosphere. Besides, the results of the kinetic analysis illustrated that the pseudo-first-order model showed better agreement with the experimental data compared to the intraparticle diffusion model. These experimental and theoretical results in this work are helpful in mercury capture under an oxy-fuel atmosphere.

show abstract

Section: Introductionmentioning

confidence: 99%

Activated Carbon for Capturing Hg in Flue Gas under O₂/CO₂ Combustion Conditions. Part 1: Experimental and Kinetic Study

Wang

Duan

et al. 2018

Energy Fuels

View full text Add to dashboard Cite

show abstract

“…Enriched Hg 0 from the circulating oxy-fuel gas is one of them . Mercury is capable of attacking the aluminum component in the CO 2 compression and purification unit, causing serious failures for the whole system. Thus, mercury from the circulating oxy-fuel gas must be controlled before entering the CO 2 compression and purification unit of the oxy-fuel combustion system .…”

Section: Introductionmentioning

confidence: 99%

NH₄Br-Modified Biomass Char for Mercury Removal in a Simulated Oxy-fuel Atmosphere: Mechanism Analysis by X-ray Photoelectron Spectroscopy

et al. 2020

View full text Add to dashboard Cite

Mercury from recycled oxy-fuel gas needs to be removed because it can damage the aluminum devices in the system. In this work, low-cost NH4Br-modified rice husk char (RHCBr) was prepared as the biosorbent for mercury removal in an oxy-fuel atmosphere. RHCBr was characterized by scanning electron microscopy, Brunauer–Emmett–Teller, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy (XPS) technologies to study the physical and chemical properties of the prepared sorbents. Effects of O2, HCl, SO2, and HCl/SO2 synthesis on mercury removal in a simulated oxy-fuel atmosphere were investigated in a fixed-bed reactor. XPS technology was applied to explore the mercury adsorption species and deduce the potential mercury heterogeneous oxidation mechanism in an oxy-fuel atmosphere. It was found that enriched CO2 in an oxy-fuel atmosphere could facilitate the mercury removal process. Generally, O2 and HCl could promote the mercury removal efficiency in an oxy-fuel atmosphere, while SO2 could inhibit it. However, a low concentration of SO2 could promote it with the presence of HCl and O2. The mercury adsorption species on RHCBr were mainly HgSO4, HgCl2, and HgBr2 in the presence of acid gas components (HCl and SO2). HCl could actively facilitate the generation of C–Cl groups, which were also active sites for mercury removal, while SO2 could generate active site cover NH4HSO4, causing the deactivation of active sites. When HCl/SO2 synthesis was added, active site cover HSO4 – would be removed by HCl, facilitating the mercury removal process. Meantime, HgCl2 species could be further converted to the strong-bonded species HgSO4 in the presence of O2 and SO2, which was also beneficial for mercury removal.

show abstract

“…The mercury emission characteristics from oxy-fuel combustion and the mercury emission control in different units of power plants were studied consequently . Most researchers have reached a consensus that the mercury concentration in oxy-fuel combustion is higher than that in air combustion. ,, With the consideration of mercury removal by WFGD systems, Yang et al detected the contents of gaseous mercury at the inlet and outlet of the WFGD unit under an oxy-fuel combustion atmosphere and found that the pollution control device still exhibits ability on mercury abatement. When the flue gas is enriched with CO 2 , it is easy to infer that some distinct reactions may occur during the desulfurization process.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Mercury Re-emission and Migration in a Lab-Scale Wet Flue Gas Desulfurization Scrubber under Simulated Air and Oxy-Fuel Combustion Atmospheres

Bao

Liu

et al. 2020

Energy Fuels

View full text Add to dashboard Cite

Based on a lab-scale wet flue gas desulfurization scrubber, mercury re-emission and migration during the desulfurization process were experimentally investigated under simulated air and oxy-fuel combustion atmospheres. The effects of O 2 , CO 2 , and metal ions were especially studied. The results show that adding O 2 to a pure N 2 atmosphere can remarkably enhance Hg 0 re-emission because of an obvious decline of pH values, while the introduction of 75% CO 2 to N 2 atmosphere results in a limited Hg 0 re-emission because of a lower pH drop. The re-emission of Hg 0 is found to be slightly suppressed with increasing O 2 concentration from 3 to 9% under air atmosphere and from 3 to 6% under oxy-fuel combustion atmosphere. Moreover, a further increase of O 2 concentration to 12% has no significant impact on Hg 0 re-emission under these two atmospheres. At a higher CO 2 concentration, less mercury is re-emitted to the gas phase and more mercury is maintained in the solid phase. Under N 2 atmosphere, metal ions such as Fe 2+ , Mn 2+ , and Ni 2+ can intensify Hg 0 re-emission in the order of Fe 2+ > Ni 2+ > Mn 2+ . However, the reduction of mercury is inhibited by metal ions under air and oxy-fuel combustion atmospheres. The inhibitory effect of Fe 2+ is intensified with increasing CO 2 concentration. It can be concluded that the existence of Fe 2+ is more conducive to mercury control under oxy-fuel combustion atmosphere than that under air atmosphere.

show abstract

Mercury Behavior and Retention in Oxy-fuel Combustion

Cited by 3 publications

References 52 publications

Activated Carbon for Capturing Hg in Flue Gas under O₂/CO₂ Combustion Conditions. Part 1: Experimental and Kinetic Study

Activated Carbon for Capturing Hg in Flue Gas under O₂/CO₂ Combustion Conditions. Part 1: Experimental and Kinetic Study

NH₄Br-Modified Biomass Char for Mercury Removal in a Simulated Oxy-fuel Atmosphere: Mechanism Analysis by X-ray Photoelectron Spectroscopy

Characteristics of Mercury Re-emission and Migration in a Lab-Scale Wet Flue Gas Desulfurization Scrubber under Simulated Air and Oxy-Fuel Combustion Atmospheres

Contact Info

Product

Resources

About

Mercury Behavior and Retention in Oxy-fuel Combustion

Cited by 3 publications

References 52 publications

Activated Carbon for Capturing Hg in Flue Gas under O2/CO2 Combustion Conditions. Part 1: Experimental and Kinetic Study

Activated Carbon for Capturing Hg in Flue Gas under O2/CO2 Combustion Conditions. Part 1: Experimental and Kinetic Study

NH4Br-Modified Biomass Char for Mercury Removal in a Simulated Oxy-fuel Atmosphere: Mechanism Analysis by X-ray Photoelectron Spectroscopy

Characteristics of Mercury Re-emission and Migration in a Lab-Scale Wet Flue Gas Desulfurization Scrubber under Simulated Air and Oxy-Fuel Combustion Atmospheres

Contact Info

Product

Resources

About

Activated Carbon for Capturing Hg in Flue Gas under O₂/CO₂ Combustion Conditions. Part 1: Experimental and Kinetic Study

Activated Carbon for Capturing Hg in Flue Gas under O₂/CO₂ Combustion Conditions. Part 1: Experimental and Kinetic Study

NH₄Br-Modified Biomass Char for Mercury Removal in a Simulated Oxy-fuel Atmosphere: Mechanism Analysis by X-ray Photoelectron Spectroscopy