Cooperative removal of SO2 and NO using a cost-efficient triple-area control method

Hao, Runlong; Song, Yunchang; Tian, Zhiyin; Li, Yunhao; Zhao, Yi; Wang, Zheng; Gong, Yun; Qian, Z.

doi:10.1016/j.cej.2019.123164

Cited by 21 publications

(10 citation statements)

References 31 publications

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“…This is mainly because the Hg 0 concentration in flue gas is relatively low and SO 2 preferentially reacts with NaClO 2 in the limestone slurry, resulting in a significant reduction of the efficient Hg 0 removal duration by NaClO 2 . The specific reaction process of SO 2 and NaClO 2 in limestone slurry is shown in eqs –. ,, For the limestone slurry without NaClO 2 , the desulfurization process mainly follows the reaction of eqs –. However, when NaClO 2 is added to the limestone slurry, the desulfurization process will follow the reaction of eqs and in addition to the above process.…”

Section: Results and Discussionmentioning

confidence: 99%

New Insight into the Characteristics and Mechanism of Hg⁰ Removal by NaClO₂ in Limestone Slurry

et al. 2021

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In this study, the Hg0 removal characteristics of NaClO2 in limestone slurry were investigated in a bubbling reactor. The effects of slurry conditions (pH, temperature, and Cl– concentration) and flue gas components (NO, SO2, HCl, etc.) on Hg0 removal activity and efficient Hg0 removal duration were explored. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) were used to characterize the solid products prepared under different conditions. It was found that NaClO2 exhibited superior Hg0 removal activity when both SO2 and NO were present in the flue gas, while the Hg0 removal efficiency reduced significantly in the absence of SO2 and/or NO. The Hg0 removal activity of NaClO2 decreased significantly with the increase of pH value. The slurry temperature had no obvious effect on Hg0 removal activity, while higher temperature could enhance the Hg0 re-emission at a later stage. However, the presence of Cl– in limestone slurry could notably inhibit the Hg0 re-emission. The characterization results showed that the presence of SO2 and NO promoted the formation of HgCl2, Hg(NO3)2, and HgSO4, thus significantly enhancing the Hg0 removal activity of NaClO2 in limestone slurry.

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Section: Results and Discussionmentioning

confidence: 99%

New Insight into the Characteristics and Mechanism of Hg⁰ Removal by NaClO₂ in Limestone Slurry

et al. 2021

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“…It is assumed that 90% of NH 3 , SO 2 , and HCl can be removed from the FG by water scrubbing 18,26–28 . In order to reduce the pollutant concentrations, it is assumed that the removal rate of NH 4 ‐N, HCl, and SO 2 are 99.7%, 80%, and 96% 29–31 . The contents of such contaminants in external water and FG (Stream 1 and Stream 6) are listed in Table 1, 20 and Table 2 32 .…”

Section: System Description and Methodologymentioning

confidence: 99%

Potential environmental benefits of integrating flue gas quench in biomass/waste‐fueled CHP plants

Wang

Naqvi

et al. 2020

Energy Science & Engineering

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Due to stricter regulations, large biomass/waste incineration power plants are expected to reduce (i) pollutant emissions through water (such as organic compounds dissolved in the discharge water), (ii) the withdrawal of external freshwater, and (iii) the disturbance to the natural water by increasing the water recycle and internal reuse. To address such challenges, flue gas quench (FGQ) is playing a vital role that links flue gas (FG) cleaning and wastewater treatment. In this study, a detailed analysis based on the material and energy balance is performed regarding the pollutant distribution in the flue gas and the wastewater within a combined heat and power (CHP) plant. The real data from the reference CHP plant were used; and results show that the utilization of FGQ can result in less wastewater discharge (about 73 tonnes/d) together with less pollutant concentration to the municipal wastewater treatment plant, as compared to the system with only flue gas condenser but without FGQ. The integration of FGQ also results in less burden on the external freshwater use by increasing the amount of clean water for internal use (about 57 tonnes per day). In addition, the integration of FGQ can offer a potential annual energy saving of about 13.1 MWh in the municipal wastewater treatment plant due to the less wastewater coming from the CHP plant.

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“…There are some disadvantages in this kind of independent processing strategy for every gaseous pollutant, such as complex systems, high investment, and operation costs. Simultaneous removal technologies of multigaseous pollutants (two or more gaseous pollutants) possess good prospect of industrial application because of its simpler system, and lower investment and operation costs. − So far, many simultaneous removal technologies of multigaseous pollutants have been developed, which mainly include catalytic oxidation, plasma removal, adsorption, photocatalytic, photochemical removal, microwave removal, chemical oxidation, and so on. ,,,− In these technologies, free radical induced-AOTs are considered to be one of the most promising technologies because they can not only produce highly active free radicals with strong oxidation ability to simultaneously degrade most of gaseous pollutants (they are especially suitable for simultaneous removal of multigaseous pollutants), but also their reaction processes are environmentally friendly. − …”

Section: Introductionmentioning

confidence: 99%

A Critical Review on Removal of Gaseous Pollutants Using Sulfate Radical-based Advanced Oxidation Technologies

Liu

Wang

2021

Environ. Sci. Technol.

114

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Excessive emissions of gaseous pollutants such as SO2, NO x , heavy metals (Hg, As, etc.), H2S, VOCs, etc. have triggered a series of environmental pollution incidents. Sulfate radical (SO4•–)-based advanced oxidation technologies (AOTs) are one of the most promising gaseous pollutants removal technologies because they can not only produce active free radicals with strong oxidation ability to simultaneously degrade most of gaseous pollutants, but also their reaction processes are environmentally friendly. However, so far, the special review focusing on gaseous pollutants removal using SO4•–-based AOTs is not reported. This review reports the latest advances in removal of gaseous pollutants (e.g., SO2, NO x , Hg, As, H2S, and VOCs) using SO4•–-based AOTs. The performance, mechanism, active species identification and advantages/disadvantages of these removal technologies using SO4•–-based AOTs are reviewed. The existing challenges and further research suggestions are also commented. Results show that SO4•–-based AOTs possess good development potential in gaseous pollutant control field due to simple reagent transportation and storage, low product post-treatment requirements and strong degradation ability of refractory pollutants. Each SO4•–-based AOT possesses its own advantages and disadvantages in terms of removal performance, cost, reliability, and product post-treatment. Low free radical yield, poor removal capacity, unclear removal mechanism/contribution of active species, unreliable technology and high cost are still the main problems in this field. The combined use of multiactivation technologies is one of the promising strategies to overcome these defects since it may make up for the shortcomings of independent technology. In order to improve free radical yield and pollutant removal capacity, enhancement of mass transfer and optimization design of reactor are critical issues. Comprehensive consideration of catalytic materials, removal chemistry, mass transfer and reactor is the promising route to solve these problems. In order to clarify removal mechanism, it is essential to select suitable free radical sacrificial agents, probes and spin trapping agents, which possess high selectivity for target specie, high solubility in water, and little effect on activity of catalyst itself and mass transfer/diffusion parameters. In order to further reduce investment and operating costs, it is necessary to carry out the related studies on simultaneous removal of more gaseous pollutants.

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Cooperative removal of SO2 and NO using a cost-efficient triple-area control method

Cited by 21 publications

References 31 publications

New Insight into the Characteristics and Mechanism of Hg⁰ Removal by NaClO₂ in Limestone Slurry

New Insight into the Characteristics and Mechanism of Hg⁰ Removal by NaClO₂ in Limestone Slurry

Potential environmental benefits of integrating flue gas quench in biomass/waste‐fueled CHP plants

A Critical Review on Removal of Gaseous Pollutants Using Sulfate Radical-based Advanced Oxidation Technologies

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Cooperative removal of SO2 and NO using a cost-efficient triple-area control method

Cited by 21 publications

References 31 publications

New Insight into the Characteristics and Mechanism of Hg0 Removal by NaClO2 in Limestone Slurry

New Insight into the Characteristics and Mechanism of Hg0 Removal by NaClO2 in Limestone Slurry

Potential environmental benefits of integrating flue gas quench in biomass/waste‐fueled CHP plants

A Critical Review on Removal of Gaseous Pollutants Using Sulfate Radical-based Advanced Oxidation Technologies

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New Insight into the Characteristics and Mechanism of Hg⁰ Removal by NaClO₂ in Limestone Slurry

New Insight into the Characteristics and Mechanism of Hg⁰ Removal by NaClO₂ in Limestone Slurry