Modeling and experimental studies of in-duct mercury capture by activated carbon injection in an entrained flow reactor

Zhou, Qiang; Duan, Yufeng; Zhao, Shilin; Zhu, Chun; She, Min; Zhang, Jun; Shuang-qun, Wang

doi:10.1016/j.fuproc.2015.08.018

Cited by 41 publications

(14 citation statements)

References 37 publications

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“…Even though the mathematical formulation is a brief summary and simplifies some elements, this model can roughly predict the performance of sorbents. Besides, Duan et al have analyzed the influences of model parameters and verified that the mathematical model is suitable for mercury removal speculation. In general, the mathematical model helps to prejudge the applicability of adsorbents for real flue gas mercury capture.…”

Section: Resultsmentioning

confidence: 99%

Performance of CuCl₂-Modified Activated Carbon on Mercury Capture after Injection in an Entrained Flow Reactor

Chen

Liu

Guo

et al. 2020

Ind. Eng. Chem. Res.

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Sorbent injection in coal-fired flue gas is complicated, and the performance of sorbents in a duct is much different from that in a fixed bed. For a better understanding of sorbent injection performance in the actual flow state, experiments on mercury removal by CuCl 2 -modified activated carbon (CuCl 2 -AC) were conducted in an entrained flow reactor. The effects of reaction conditions and gas flow parameters have been researched, such as initial Hg 0 concentration, sorbent injection concentration, residence time, and reaction temperature. Compared with raw activated carbon, CuCl 2 -AC exhibits superior performance in mercury removal under various conditions. Experimental results show that Hg 0 removal efficiencies of CuCl 2 -AC rise with an increase of initial Hg 0 concentration and residence time. In the entrained flow reactor, influences of flue gas components and reaction temperature are not remarkable on the performance of CuCl 2 -AC. Besides, the results of the entrained flow reactor show good agreement with the mass-transfer adsorption model for sorbents in flue gas, which indicates that CuCl 2 -AC has the potential for mercury capture after being injected into the duct.

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Section: Resultsmentioning

confidence: 99%

Performance of CuCl₂-Modified Activated Carbon on Mercury Capture after Injection in an Entrained Flow Reactor

Chen

Liu

Guo

et al. 2020

Ind. Eng. Chem. Res.

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“…This model assumes that the activated lignite particles have a uniform pore structure and that the effective gas-phase diffusion coefficient is constant. The latter one is calculated from the values of the mercury diffusion coefficient in air, reported in the literature, and the Knudson diffusion coefficient (Skodras et al, 2008;Zhou et al, 2015). For its part, the boundary layer mass transfer coefficient was determined using the Sherwood number correlation (Skodras et al, 2008).…”

Section: Mercury Adsorption Modeling On Activated Lignitementioning

confidence: 99%

New insights on mercury abatement and modeling in a full-scale municipal solid waste incineration flue gas treatment unit

et al. 2020

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Modeling approaches are generally used to describe mercury transformations in a single step of flue gas treatment processes. However, less attention has been given to the interactions between the different process stages. Accordingly, the mercury removal performance of a full-scale solid waste incineration plant, equipped with a dry flue gas treatment line was investigated using two complementary modeling strategies: a thermochemical equilibrium approach to study the mercury transformation mechanisms and speciation in the flue gas, and a kinetic approach to describe the mercury adsorption process. The modeling observations were then compared to real-operation full-scale data. Considering the typical flue gas composition of waste incineration facilities (high concentrations of HCl compared to Hg), it was found that a process temperature decrease results in better mercury removal efficiencies, associated with a higher oxidation extent of Hg in HgCl 2 , and the enhancement of the sorbent capacity. Improvements can also be attained by increasing the sorbent injection rate to the process, or the solid/gas separation cycles. An empirical correlation to predict the mercury removal efficiency from the main operating parameters of dry flue gas treatment units was proposed, representing a useful tool for waste incineration facilities. The presented modeling approach proved to be suitable to evaluate the behavior of full-scale gas treatment units, and properly select the most adequate adjustments in operating parameters, in order to respect the increasingly constraining mercury emissions regulations.

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“… 4 − 6 It is well-known that Hg p and Hg 2+ can be easily controlled by dust removal devices and wet flue gas desulfurization (WFGD), respectively. 7 , 8 Nevertheless, Hg 0 is difficult to remove because it is insoluble and volatile at normal temperature and pressure. 9 , 10 Consequently, development of systems that ensure the removal of Hg 0 is imperative.…”

Section: Introductionmentioning

confidence: 99%

Biomass Carbon Magnetic Adsorbent Constructed by One-Step Activation Method for the Removal of Hg⁰ in Flue Gas

Huo

Chen

et al. 2022

ACS Omega

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Elemental mercury (Hg 0 ) emission from industrial boilers equipped in factories such as coal-fired power plants poses serious hazards to the environment and human health. Herein, an iron-modified biomass carbon (Fe/BC) magnetic adsorbent was prepared by a one-step method using pepper straw waste as raw material and potassium oxalate and ferric nitrate as activator and catalyst precursor, respectively. A fixed-bed reactor was used to evaluate the Hg 0 removal performance of the Fe/BC adsorbent. The synthesized adsorbent showed a wide temperature window for Hg 0 removal. In a N 2 + O 2 atmosphere, the removal efficiency toward Hg 0 was 97.6% at 150 °C. Further, O 2 or SO 2 could promote the removal of Hg 0 , while NO could inhibit the conversion of Hg 0 over the Fe/BC adsorbent. The consequence of XPS and Hg-TPD showed that lattice oxygen in Fe 2 O 3 and chemisorbed oxygen were the main active sites for Hg 0 removal, and HgO was the main mercury species on used Fe/BC. Moreover, Fe/BC adsorbent showed a good regeneration and magnetization performance, which was conducive to the cost reduction of actual industrial application. This study provides a facile approach for efficient removal of Hg 0 using biomass-derived carbon material.

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Modeling and experimental studies of in-duct mercury capture by activated carbon injection in an entrained flow reactor

Cited by 41 publications

References 37 publications

Performance of CuCl₂-Modified Activated Carbon on Mercury Capture after Injection in an Entrained Flow Reactor

Performance of CuCl₂-Modified Activated Carbon on Mercury Capture after Injection in an Entrained Flow Reactor

New insights on mercury abatement and modeling in a full-scale municipal solid waste incineration flue gas treatment unit

Biomass Carbon Magnetic Adsorbent Constructed by One-Step Activation Method for the Removal of Hg⁰ in Flue Gas

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Modeling and experimental studies of in-duct mercury capture by activated carbon injection in an entrained flow reactor

Cited by 41 publications

References 37 publications

Performance of CuCl2-Modified Activated Carbon on Mercury Capture after Injection in an Entrained Flow Reactor

Performance of CuCl2-Modified Activated Carbon on Mercury Capture after Injection in an Entrained Flow Reactor

New insights on mercury abatement and modeling in a full-scale municipal solid waste incineration flue gas treatment unit

Biomass Carbon Magnetic Adsorbent Constructed by One-Step Activation Method for the Removal of Hg0 in Flue Gas

Contact Info

Product

Resources

About

Performance of CuCl₂-Modified Activated Carbon on Mercury Capture after Injection in an Entrained Flow Reactor

Performance of CuCl₂-Modified Activated Carbon on Mercury Capture after Injection in an Entrained Flow Reactor

Biomass Carbon Magnetic Adsorbent Constructed by One-Step Activation Method for the Removal of Hg⁰ in Flue Gas