Article
Engineering, Environmental
Jing-Rui Yang, Ying Wang, Hu Chen, Rui-Peng Ren, Yong-Kang Lv
Summary: A new method of NOx removal using the OABR integrated system has been introduced, with experimental results demonstrating an efficiency of up to 98.8% under optimal conditions. The system can maintain high efficiency levels above 94% during stable operation, making it a promising option for industrial applications.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Energy & Fuels
Yu Chen, Pilar Lisbona, Virginia Perez, Xin Guo
Summary: The study focused on improving the efficiency of mercury removal by adding MnCl2 to magnetic iron-carbon, finding that higher impregnation solution concentrations led to more MnCl2 loaded sorbents but with poorer physical properties. Experimental results showed that the presence of oxygen can facilitate mercury oxidation, while the resistance to SO2 can be enhanced after doping.
Article
Engineering, Environmental
Haomiao Xu, Qinyuan Hong, Zhao-Yang Zhang, Xiangling Cai, Yurui Fan, Zhisong Liu, Wenjun Huang, Naiqiang Yan, Zan Qu, Lizhi Zhang
Summary: A superstable Hg3Se2Cl2 compound is discovered and proven to be a promising solution for efficient and safe flue gas mercury removal. The compound exhibits high thermal stability and strong acid resistance, and laboratory experiments demonstrate its exceptional performance in removing mercury from flue gas. This study highlights the importance of stable demercury products in flue gas treatment and provides an efficient and practical demercury strategy.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Review
Engineering, Environmental
Rong Chen, Tongsheng Zhang, Yiqun Guo, Jiawei Wang, Jiangxiong Wei, Qijun Yu
Summary: The paper provides a timely review of simultaneous de-SO2 and de-NOx methods, categorizing them into four pathways and systematically reviewing the removal process, basic mechanism, and kinetics of each pathway. The main challenges and potential breakthroughs in developing novel methods are critically discussed, providing a roadmap for prospective research activities. This review offers deeper insights into understanding the mechanisms of de-SO2 and de-NOx, aiming to develop innovative simultaneous removal methods or enhance the efficiency of available abatement methods.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Energy & Fuels
Ziyao Yang, Yang Xu, Xuehui Sun, Cong Nie, Mantang Chen, Qingzhu Zhang, Guangqian Luo
Summary: In this study, novel S-doped sorbents were developed for Hg0 removal from coal-fired flue gas by one-step co-pyrolysis of biomass and scrap tires under SO2 atmosphere. The presence of SO2 improved the performance of S-doped sorbents and resulted in increased sulfur content and decreased carbon content. The activated sorbents had higher specific surface area, pore volume, and micropore content compared with raw sorbents. The S-doped sorbents showed excellent performance for Hg0 removal and good water-resistance due to the presence of ZnS. O2 and NO had positive effects on Hg0 removal and the behavior of Hg0 removal over S-doped sorbents followed a pseudo-second-order model.
Review
Chemistry, Analytical
Zihan Zhu, Bin Xu
Summary: This paper reviews recent literature on NOx post-combustion purification methods using different reagents. It categorizes the purification technologies into oxidation, reduction, and adsorption/absorption approaches based on changes in the valence of nitrogen (N). The paper systematically reviews the removal processes, mechanisms, and influencing factors of each method, and discusses the main challenges and potential breakthroughs. The proposed review provides a fundamental understanding of denitrification from flue gas and offers guidance for selecting effective methods.
Article
Multidisciplinary Sciences
Shiqing Wang, Shisen Xu, Shiwang Gao, Ping Xiao, Minhua Jiang, He Zhao, Bin Huang, Lianbo Liu, Hongwei Niu, Jinyi Wang, Dongfang Guo
Summary: Under cold temperatures, the presence of oxygen enhances the adsorption capacity of NO on activated carbon. The adsorption capacity of SO2 is also significantly increased at low temperatures. A novel low-temperature adsorption (LAS) process is developed for simultaneous removal of SO2 and NOx from flue gas.
SCIENTIFIC REPORTS
(2021)
Article
Environmental Sciences
Binghua Xie, Na Geng, Qian Yu, Di He, Fang Wang, Tiancheng Liu, Jiyun Gao, Ping Ning, Xin Song, Lijuan Jia
Summary: The study proposed a novel desulfurization method using blast furnace dust slurry to control SO2 emission and achieve waste control targets, with optimal conditions yielding 100% desulfurization efficiency. Response surface methodology results indicated the significant influence of oxygen concentration on SO2 removal efficiency. The potential desulfurization mechanism of blast furnace dust was proposed, providing a promising and low-cost desulfurization technology.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Energy & Fuels
Qiang Zhou, Xin Tao, Guancheng Di, Yu Shang, Ping Lu, Guiling Xu, Mengting Liu, Yuqiu Zheng, Liang Dong
Summary: The Ce-doped Fe6Mn0.8Ce0.2Oy magnetic sorbent exhibits good SO2 tolerance and can be used for the circulating removal of mercury in high-temperature flue gas. Ce protects Mn4+ active sites from SO2 poisoning, while O-2 helps supplement oxygen vacancies in a timely manner, enhancing the sorbent's tolerance.
Article
Energy & Fuels
Shengji Wu, Yalun Ma, Wangsheng Yu, Hui Wang, Wei Yang, Lei Che, Zhongxi Han
Summary: This study investigates the enhancement of SO2 tolerance in transition metal oxide-supported activated carbon for mercury capture from flue gas. The results demonstrate that the loading amount of the active center plays a crucial role in improving the mercury removal performance and SO2 tolerance of CeO2/AC and Co3O4/AC adsorbents. The 20%CeO2/AC adsorbent exhibits excellent mercury removal efficiency, strong SO2 tolerance, and relatively lower cost, making it the optimal choice for mercury capture from flue gas.
Article
Engineering, Chemical
Mengxi Zhao, Changjun Zou
Summary: MgO nanofluids show better desulfurization effect in wet desulfurization process compared to MgO slurry by improving desulfurization efficiency. The density and viscosity of MgO nanofluids increase with concentration, but decrease with temperature. Properly reducing particle size can enhance the desulfurization efficiency of MgO absorbent in removing SO2 from flue gas.
Article
Engineering, Environmental
Ting Yao, Jisheng Long, Yufeng Duan, Rajender Gupta, Zhenghe Xu
Summary: In this study, alpha-MnO2 was supported onto silica coated magnetite nanoparticles (MagS-Mn) to investigate the adsorption and oxidation of Hg0 and the influence of SO2 and O2 on Hg0 removal. MagS-Mn exhibited a Hg0 removal capacity of 1122.6 mu g/g at 150 degrees C with the presence of SO2. The adsorption and oxidation efficiencies of Hg0 were 2.4% and 90.6%, respectively. The Hg0 removal capability decreased at higher temperatures.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Chemistry, Applied
Zhaoxin Wan, Liangyan Duan, Xiude Hu, Xinlei Li, Long Fang, Qingjie Guo, Deshuai Sun
Summary: Coal combustion emits mercury, which can be removed using coal gasification fine slag (FS) immobilized with ionic liquids (IL-T and IL-B). The efficiency of mercury removal increased when supported by the ILs. The presence of SO2 had negligible impact on Hg0 capture. The total mercury removal efficiencies exceeded 90% for FS-T and FS-B in a specific atmosphere. The effective adsorption time for FS-T and FS-B was longer than FS, and Hg-0 and Hg2+ were detected in exhaust gas and solid phase.
FUEL PROCESSING TECHNOLOGY
(2022)
Review
Engineering, Environmental
Yu Guan, Yinhe Liu, Qiang Lv, Jiang Wu
Summary: Photocatalytic oxidation is a promising technology for addressing industrial flue gas mercury (Hg) pollution. Bi-based photocatalysts have attracted attention due to their unique structures and high performance, offering potential solutions to the issue.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Energy & Fuels
Chuanqiang Zhu, Jinbo Ru, Shiqiu Gao, Changming Li
Summary: The SDNS technology, which involves direct injection of DNS and DSS agents, can effectively remove NOx and SO2 from flue gas. It offers high efficiency, stable operation, and is simpler and more cost-effective compared to traditional tail-end purification processes.
Article
Energy & Fuels
Cong Xu, Junguang Lin, Zhihua Wang, Kaidi Wan, Shien Sun, Zhijun Zhou
Summary: By using numerical simulation, it was found that ozone has multiple effects on lean premixed syngas turbulent flame. It increases the flame surface area, promotes the ignition process, accelerates the generation of intermediate products, and affects the flame surface morphology.
Article
Energy & Fuels
Runfan Zhu, Zhihua Wang, Yong He, Yanqun Zhu, Kefa Cen
Summary: This paper presents a comparative life cycle assessment of two types of H-2 carriers, methanol and ammonia, using GaBi 10 software. The energy analysis results show that H-2 carrier produced from natural gas has higher energy efficiency than that from renewables. Carbon footprint evaluation indicates that solar PV-based ammonia production route has the lowest GWP in all scenarios. Electricity has been found as the key factor affecting GHG emissions in the routes of fuels produced from renewable H-2 through sensitivity analysis.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Qi Ni, Yanqun Zhu, Wenyu Zhu, Yong He, Zhihua Wan
Summary: In this study, four different calibration strategies were applied to coal analysis using laser-induced breakdown spectroscopy (LIBS). The prediction accuracy, precision, stability, and training velocity of four calibration models were compared. The results showed that support vector regression (SVR) and back-propagation training (BP) are the most promising calibration models in terms of prediction accuracy and precision. Partial least-squares regression (PLSR) had better prediction stability and faster training velocity, while random forest (RF) performed worse than the other three models.
Article
Chemistry, Multidisciplinary
Hairong Tang, Zhihua Wang, Jiaming Shao, Fawei Lin, Peixi Liu, Yong He, Yanqun Zhu
Summary: This study investigated the application of four manganese oxides with different crystal structures in an ozone synergistic-oxidation system. Among them, a cactus-like MnO2-IV nanosphere exhibited the highest ozone decomposition activity and showed good tolerance to water vapor and SO2/H2O. The interference mechanism of O-2/O-3/H2O/SO2 molecules on MnO2-IV was revealed.
Article
Thermodynamics
Chenlin Chen, Zhihua Wang, Zuochao Yu, Xinlu Han, Yong He, Yanqun Zhu, Alexander A. Konnov
Summary: This study investigates the potential flame enhancement method in plasma-assisted combustion using ozone as an additive. The results show that ozone addition significantly affects the burning velocity of premixed ammonia gases, especially under fuel-rich conditions. The effects of ozone addition on the laminar burning velocity were experimentally and numerically investigated under various equivalence ratios.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Thermodynamics
Jiaxin Tan, Yong He, Runfan Zhu, Yanqun Zhu, Zhihua Wang
Summary: Using ammonia as a co-firing fuel in coal-fired power plants is a feasible solution to reduce carbon emissions, but it presents challenges such as low flame stability, low combustion efficiency, and high NOx emissions. This study investigates the co-firing characteristics of ammonia and pulverized coal, showing that staged combustion effectively reduces NOx emissions by minimizing char-NOx and NH3-NOx production. The injection of ammonia downstream achieves lower NOx emissions and unburned carbon content compared to pure coal combustion. The presence of a high local equivalence ratio of NH3/air and the denitration effect contribute to this reduction.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Thermodynamics
Hairong Tang, Yong He, Fawei Lin, Yanqun Zhu, Yaxin Duan, Zhihua Wang
Summary: In this study, the simultaneous catalytic ozonation of NO and dichloromethane (DCM) on Mn/H-ZSM-5 molecular sieve catalysts was investigated. The results showed that the acidity of the catalyst has a significant impact on the degradation efficiency and interaction of NO/DCM. The presence of NO inhibited DCM ozonation at lower O3/DCM ratios, while the oxidation products of NO promoted the formation and conversion of intermediates during co-ozonation. Rating: 8/10.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Energy & Fuels
Xinlu Han, Zhihua Wang, Riyi Lin, Alexander A. Konnov
Summary: This study investigates the phenomenon of SAFT in the CH4 + O2 + N2 and NH3 + O2 + N2 flames and examines the relationship between SAFT and laminar burning velocities. Experimental measurements and simulations reveal different SAFT regimes for CH4 and NH3 flames, and demonstrate the connection between SAFT extent and laminar burning velocity.
Editorial Material
Engineering, Chemical
Zhihua Wang
Article
Chemistry, Multidisciplinary
Jie Huang, Yong He, Hongtao Zhang, Yan Dai, Zhihua Wang
Summary: The burning and soot characteristics of RP-3 kerosene droplets under sub-atmospheric pressure were investigated. The droplet size during combustion was recorded using a high-speed camera, and the burning rate was determined. The flame temperature was calculated using two-color pyrometry, and the soot volume fraction was measured using LII technique. It was found that sub-atmospheric pressure inhibits the formation of soot particle clusters and promotes the oxidation process of soot particles. The collected soot particles showed a significant reduction in particle size under sub-atmospheric pressure.
Article
Energy & Fuels
Ziyue Zhang, Runfan Zhu, Yanqun Zhu, Wubin Weng, Yong He, Zhihua Wang
Summary: In 2020, energy-related CO2 emissions reached a record high of 31.5 Gt, resulting in an unprecedented atmospheric CO2 level of 412.5 ppm. Hydrogen blending in natural gas is a solution for maximizing clean energy utilization and enabling long-distance H-2 transport. However, there is still insufficient understanding of the combustion characteristics of natural gas blended with a high proportion of hydrogen, especially with minority species. Experimental and simulated results indicate that there is no difference between CH4 and NG with a large proportion of H-2 in terms of laminar burning velocity and kinetic analysis.
Article
Energy & Fuels
Lishan Liu, Feng Gong, Yunlong Xie, Sijun Wang, Yu Qiu, Zhihua Wang, Rui Xiao
Summary: Manufacturing hydrogen from ammonia decomposition is efficient, but the use of precious metal catalysts hampers its scalable application. In this study, we report the synthesis of metal-doped graphdiyne catalysts, particularly Co-doped graphdiyne, for ammonia decomposition. The Co-doped graphdiyne catalyst demonstrated high reactivity and stability, achieving nearly complete ammonia decomposition at 550℃ and maintaining conversion rate stability over 18 hours of continuous reaction.
Article
Chemistry, Analytical
Qi Ni, Yong He, Wubin Weng, Yanqun Zhu, Zhihua Wang
Summary: Collinear double-pulse laser-induced breakdown spectroscopy was used to investigate the intensity enhancement factors of emission lines of representative elements in coal. The results showed significant enhancement factors for most selected lines with an energy ratio of 20:100. The correlation between signal enhancement and the upper energy level was also explored using calcium lines.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2023)
Article
Engineering, Environmental
Yulin Sun, Peixi Liu, Zhihua Wang, Hairong Tang, Yong He, Yanqun Zhu
Summary: A series of Cu-Mn oxides catalysts were synthesized using different precipitants for the catalytic ozonation of ethyl acetate (EA). CuMn-II with H2C2O4 as precipitant exhibited the best catalytic activity due to its abundant surface defects, oxygen vacancies, larger specific surface area, higher content of Mn3+, and more acid sites.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Yaxin Duan, Peixi Liu, Fawei Lin, Yong He, Yanqun Zhu, Zhihua Wang
Summary: Five Mn-loaded catalysts were synthesized on different supports and their catalytic ozonation performance for DCM was evaluated under industrial conditions. The results showed that all catalysts achieved over 90% DCM conversion, with Mn/nanoAl2O3 exhibiting the best performance. Both H2O and SO2 affected the catalyst activity, with the inhibition caused by H2O being reversible.
