Article
Energy & Fuels
Mohsen Abdelaal, Medhat El-Riedy, Ahmed M. El-Nahas, Fathy R. El-Wahsh
Summary: This experimental study investigates the effect of flue gas recirculation on non-premixed combustion for NOx reduction and CO2 capture and storage. The results show that flame stability can be improved with certain percentages of recirculated flue gas, leading to a reduction of NOx emissions but also causing a decrease in flame temperature.
Review
Engineering, Environmental
Wei Zheng, Hailong Li, Zequn Yang, Jianping Yang, Wenqi Qu, Fanyue Meng, Yong Feng, Zhengyong Xu, Xueyi Guo
Summary: This review highlights the global concerns over mercury contamination and the advantages of mineral chalcogenides in immobilizing gaseous elemental mercury. It provides an overview of research progress and application conditions of mineral chalcogenides for Hg-0 removal, as well as comparisons of their adsorption performance. Comprehensive discussions on influential factors and mechanisms for Hg-0 removal by different mineral chalcogenides are also presented to guide future research directions.
CHEMICAL ENGINEERING JOURNAL
(2021)
Review
Engineering, Environmental
Ting Liu, Zhuo Xiong, Peng Ni, Zizhen Ma, Yan Tan, Zishun Li, Shengnan Deng, Yincui Li, Qirong Yang, Huawei Zhang
Summary: This review focuses on the current situation of Hg0 removal on different kinds of adsorbents in coal combustion flue gas, smelting flue gas, and natural gas. Hydrophobic groups, hydrophobic materials, and modification of sulfur/selenium pretreatment and metals loading can effectively overcome the problem of H2O and SO2. Additionally, separation, regeneration, and recovery aspects are explored and summarized, with thermal treatment accompanied by different components being widely adopted as an efficient approach to recover the adsorption ability.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Ming-Xin Xu, Hai-Bo Wu, Ya-Chang Wu, Han-Xiao Wang, Hao-Dong Ouyang, Qiang Lu
Summary: The process of flue gas compression and purification plays a crucial role in determining the quality of CO2 product in oxy-fuel combustion. A novel system integrating partial CO2 recirculation with flue gas purification was proposed and evaluated, achieving a purity of 99.9% CO2 stream. Enhancing condensing pressure to 3.0-4.0 MPa improved CO2 recovery performance, while critical ratios between recycled CO2 liquid and raw flue gas were identified for efficient contaminant abatement. The efficiencies of SO2 and NO removal exceeded 99%, with critical molar ratios and reactions pressures determining the success of abatement.
Article
Agricultural Engineering
Liping Tan, Lei Cai, Yanlei Xiang, Yanwen Guan, Wenbin Liu
Summary: This study establishes a biomass integrated gasification combined cycle with oxy-fuel combustion technology to achieve negative CO2 emissions in power plants. The effects of gas turbine pressure ratio and inlet temperature on the system performance are investigated. The results show that the system efficiency increases with the increase of CO2/C value, gas turbine pressure ratio, and inlet temperature. The results obtained in this study can provide theoretical support for the application of this technology.
BIOMASS & BIOENERGY
(2022)
Article
Thermodynamics
Kaiyang Li, Yimin Zeng, Jing-Li Luo
Summary: The study investigated the corrosion performance of three candidate alloys in high-temperature flue gas environments, finding that O-2 acted as the dominant oxidizing agent, H2O likely enhanced oxide growth, and CO2 did not trigger carburization during testing.
Article
Thermodynamics
Hyung Woo Kim, Su Been Seo, Seo Yeong Kang, Eun Sol Go, Seung Seok Oh, YongWoon Lee, Won Yang, See Hoon Lee
Summary: This paper focuses on the design and modeling of an indirect S-CO2 cycle in an oxy-fuel circulating fluidized bed power plant. By reducing the temperature of the recirculated flue gas and analyzing the effect of water retention in the flue gas on overall net efficiency, the plant achieved higher net efficiency.
Review
Green & Sustainable Science & Technology
Alhadi Ishag, Yanxue Yue, Jingting Xiao, Xinshui Huang, Yubing Sun
Summary: This article reviews recent advances in the adsorption and oxidation of mercury from coal-fired flue gases, including the mechanisms of adsorption and catalytic oxidation under different environmental conditions. It also addresses current challenges and future research directions.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Chemistry, Multidisciplinary
Yiming Zhu, Jingmao Wu, Hui Wang, Jiajun Wang, Haotian Shen, Zhanfeng Ying
Summary: This study investigated the adsorption of mercury by 1% NH4Cl-modified biomass char under oxy-fuel combustion conditions, and analyzed the effects of temperature, adsorption bed height, and initial mercury concentration on the adsorption process. The results demonstrated that higher temperature and initial mercury concentration led to better mercury adsorption performance, which was closely related to the progress of chemical adsorption and external mass transfer.
Article
Engineering, Environmental
Feng Xin, Rihong Xiao, Yongchun Zhao, Junying Zhang
Summary: This research proposes a method to reduce elemental mercury emission from coal-fired power plants by modifying magnetospheres with H2S as a sorbent. The modified magnetospheres show high affinity towards Hg-0 and can achieve over 80% adsorption efficiency. The technology has low cost, high recyclability, and minimal impact on environmental mercury pollution.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Jianping Yang, Yuanyuan Na, Yingchao Hu, Penglin Zhu, Fanyue Meng, Qingjie Guo, Zequn Yang, Wenqi Qu, Hailong Li
Summary: Circulating adsorbents integrating elemental mercury adsorption and oxidized mercury decomposition/desorption processes were used for simultaneous adsorbent recycling and mercury recovery. The formation of granulated adsorbent pellets reduced elutriation in the system. La0.8Ce0.2MnO3 perovskite adsorbent was molded into pellets using an extrusion-spheronization method with microcrystalline cellulose (MC) as a pore-creating template. The pellets showed excellent Hg0 removal efficiency and durability in a wide temperature range, with slight interference from SO2 and H2O and enhancement from O2 and NO. The presence of pore channels in the pellets allowed for efficient Hg0 diffusion and in-situ retention during high-temperature burning.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Kening Yao, Xiao Zhang, Boxiong Shen, Qiqi Shi, Shuhao Li, Feng Shen
Summary: This study aims to design an efficient adsorbent for high-efficiency removal of elemental mercury (Hg0) from coal-fired power plant emissions. By co-implanting porous TiO2 with inorganic-organic dual functional sites (-SH and MnOx), the 2SH-MnOx/TiO2 adsorbent achieved a Hg0 removal efficiency of 90% at 175 degrees C and a high gas hourly space velocity (GHSV) of 120,000 h-1. The co-existence of -SH and MnOx was found to promote Hg0 adsorption and enhance the transfer of electrons from Hg0 to the adsorbent surface.
Article
Energy & Fuels
Hui Luo, Shilin Zhao, Anjun Ma, Kang Sun, Yanqun Zhu, Zhiqiang Sun
Summary: This study investigated the effects of flue gas components (O2, CO2, SO2, and NO) on the Hg-0 removal of mechanochemical S2Cl2-modified BC (S2Cl2-MC). It was found that O2 and CO2 promoted the escape of Hg2+ but inhibited the adsorption of Hg-0, while SO2 and NO had a certain promoting effect on the removal of Hg-0.
Article
Green & Sustainable Science & Technology
Seong-il Kim, Hosoo Lee, Yong Woon Lee, Won Yang
Summary: In a simulated A-USC POXY power plant, wet FGR was found to provide 3.5% higher plant efficiency compared to dry FGR, with less sensitivity to variations in recirculated gas flowrates. The wet FGR system was demonstrated to be an optimal choice for improving the plant net efficiency by approximately 10% compared to first-generation oxy-combustion power plants at atmospheric pressure.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2021)
Article
Engineering, Environmental
Hailong Li, Jianping Yang, Penglin Zhu, Fanyue Meng, Qingjie Guo, Tao He, Zequn Yang, Wenqi Qu
Summary: This study developed a charge distribution modulation strategy to improve the adsorption capacity and adsorption rate of metal selenide ligands for elemental mercury (Hg0) remediation. The modulated copper selenide (Cu2Se) ligand exhibited environmentally stable immobilization of Hg0 as mercury selenide (HgSe) and showed higher adsorption capacity and faster adsorption rate compared to regular Cu2Se. Additionally, the modulation technique allowed for the construction of thinner and larger nanosheets, providing more active sites for binding Hg0. This newly designed method has significant implications for real-world applications.
CHEMICAL ENGINEERING JOURNAL
(2022)
