Article
Engineering, Environmental
Qing Chen, Long Chen, Jiashuo Li, Yaqin Guo, Yongjie Wang, Wendong Wei, Chang Liu, Jiayuan Wu, Feiyun Tou, Xuejun Wang, Yi Yang
Summary: This study investigates the trend and output of mercury (Hg) content in fly ash from coal-fired power plants in China through a national sampling campaign, literature survey, and model predictions. The results show that the Hg content in fly ash is increasing, mainly due to the installation of advanced air pollution control devices. This highlights the need for stricter requirements for the disposal of solid Hg waste in China's coal-fired power plants.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Environmental Sciences
Yiming Huang, Jinling Liu, Guan Wang, Qingfeng Wang, Boping Zeng, Zhongjiu Xiao, Guangyi Sun, Zhonggen Li
Summary: This study investigated the different forms of Hg in coal fly ash from fifteen coal-fired power plants in Guizhou province, and found that Hg was mainly present in strong complexed form. Leaching experiments showed that acidic and strong alkaline conditions could lead to higher Hg leachability.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2022)
Article
Energy & Fuels
Yue Peng, Tao Wang, Yongzheng Gu, Jiawei Wang, Yongsheng Zhang, Wei-Ping Pan
Summary: This study investigated the impact of using modified fly ash for mercury removal on particulate matter emissions from a coal-fired power plant. The results showed that the total PM removal efficiency of the particulate emission control device remained around 99.1 - 99.9% despite the addition of modified fly ash.
Article
Environmental Sciences
Deming Han, Liwen Xu, Qingru Wu, Shuxiao Wang, Lei Duan, Minneng Wen, Zhijian Li, Yi Tang, Guoliang Li, Kaiyun Liu
Summary: The ultra-low emission retrofitting in China's coal-fired power plants enhances removal efficiencies of trace elements, but may increase their contents in fly ash and gypsum. While the potential environmental risks of trace elements in gypsum are low, there are moderate risks from fly ash, particularly in provinces like Guangxi, Hunan, and Hebei. Special attention should be given to the disposal of fly ash in these areas in the future.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
Qixin Yuan, Xiayu Liu, Yi Xiao, Tao Wang, Jiawei Wang, Yongsheng Zhang
Summary: Bromide coupled mechanical modified (BMM) fly ash exhibits good mercury adsorption performance and environmental stability. Long-term stability experiments show that the mercury desorption rates of BMM fly ash and activated carbon (AC) are both less than 5% after being placed in the natural environment for one year. The presence of bromine in BMM fly ash improves its adsorption efficiency and stability, making it a promising adsorbent for mercury removal from flue gas in coal-fired power plants.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Energy & Fuels
Dorcas L. E. Uaciquete, Kosuke Sakusabe, Takahiro Kato, Hirokazu Okawa, Katsuyasu Sugawara, Risehiro Nonaka
Summary: Mercury forms in coal-fired power plant fly ash were qualitatively and quantitatively determined using X-ray absorption near edge structure (XANES) analysis. The mercury content in fly ash increased linearly with an increase in unburned carbon content. The inflection point method was used to estimate the type and abundance of chemical forms present, with a linear combination fitting of control mercury compounds used for modeling the XANES spectrum of fly ash mercury.
Article
Environmental Sciences
Xinze Geng, Yufeng Duan, Shilin Zhao, Jiwei Hu, Weimeng Zhao
Summary: Current approaches for Mechanochemical bromination (MCB) modified fly ash have been focusing on the efficiency and mechanism of mercury removal. Results showed that the activation mechanism of MCB mainly enhances the mercury removal ability of fly ash due to the generation of C-Br with activated carbon and M-Br on hematite.
Article
Environmental Sciences
Zhonggen Li, Xufeng Chen, Wenli Liu, Taishan Li, Guangle Qiu, Haiyu Yan, Mingmeng Wang, Ji Chen, Guangyi Sun, Qingfeng Wang, Xinbin Feng
Summary: This study indicates that emissions from coal-fired power plants have a noticeable impact on ambient GEM and agricultural soil THg levels in the vicinity, with approximately 3.9% of the discharged mercury accumulating in nearby soils. The low retention rate of total emitted mercury by soils is attributed to the high proportion of Hg-0 in stack gas emissions and the potential loss of Hg through reemission from soil surfaces.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Engineering, Environmental
Biao Fu, Ruoyu Sun, Hong Yao, James C. Hower, Jingjing Yuan, Guangqian Luo, Hongyun Hu, Sarah M. Mardon, Quan Tang
Summary: The study simulated the fractionation of isotopes during Hg-0 adsorption onto fly ash particles. Results indicated that kinetic MDF dominated the Hg-0 adsorption process, with the magnitude of MDF remaining stable in the time-series experiment but significantly increasing with higher temperatures in the temperature-series experiment.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Environmental Sciences
Madhusmita Mishra, Saroj Kumar Sahu, Poonam Mangaraj, Gufran Beig
Summary: Coal combustion releases fly ash waste containing radionuclides, which is a growing environmental concern. A study conducted in India found that major industries are emitting significant amounts of radionuclides through fly ash, potentially impacting millions of residents living nearby. The use of cleaner or green energy is recommended as the best alternative to mitigate this unseen health disaster.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Economics
Archana Ghodeswar, Matthew E. Oliver
Summary: The study found that in India's coal-fired power sector, the reuse of fly ash leads to increased coal consumption, decreased coal quality, and higher CO2 emissions.
Article
Environmental Sciences
Amparo Pazo, Magin Lapuerta, Anselmo Acosta, Juan J. Hernandez, Esperanza Monedero
Summary: This study aimed to prevent power plant malfunction caused by feedstock properties by analyzing feedstock and ash samples from a suspension-fired boiler power plant. The research focused on identifying trends in ash composition changes and studying the relationship between ash and feedstock composition to address troublesome deposit formation.
WASTE AND BIOMASS VALORIZATION
(2022)
Article
Engineering, Environmental
Qixin Yuan, Yongsheng Zhang, Tao Wang, Jiawei Wang, Carlos E. Romero
Summary: Fly ash from coal-fired power plants is a major solid waste pollutant globally, and the mechanochemical method is effective in stabilizing heavy metals present in it. Both dry milling and wet milling methods can reduce the leaching rate of heavy metals significantly. Wet milling results in smaller fly ash particles, suggesting water weakens the agglomeration of fine particles.
Article
Green & Sustainable Science & Technology
Mengdan Gao, Liyun Yang, Shuangjian Yang, Tong Jiang, Fei Wu, Tetsuya Nagasaka
Summary: By impregnating zeolite 4A synthesized using fly ash with ammonia, more amine functional groups were introduced, leading to an increased mercury ion removal capacity. The impregnation-modification mechanism of NH3 center dot H2O, ammonium chloride, and silane coupling agent (KH792) for zeolite 4A, and the efficiency of mercury ion removal by aminated zeolites, were studied and compared. NH3 center dot H2O impregnation introduced nitrogen-containing groups similar to KH792 grafting, resulting in higher Hg2+ ion adsorption capacity. NH3 center dot H2O-zeolite also exhibited excellent removal capacity in the presence of other ions.
Article
Energy & Fuels
Irena Kostova, Denitsa Apostolova, Achim Bechtel, Doris Gross, Maya Stefanova
Summary: The presence of organic matter in fly ashes poses challenges to their utilization or beneficial use. This study examined the geochemical composition of feed coals and fly ashes from thermal power plants in the Balkan Peninsula and found that combustion altered the distribution of biomarkers. The environmental impact of the fly ashes was also evaluated.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2023)
Article
Engineering, Environmental
Jiawei Wang, Yongsheng Zhang, Tao Wang, Hong Xu, Wei-Ping Pan
CHEMICAL ENGINEERING JOURNAL
(2020)
Article
Chemistry, Physical
Huicong Zhang, Tao Wang, Jun Liu, Yongsheng Zhang, Jiawei Wang, Baomin Sun, Wei-Ping Pan
APPLIED SURFACE SCIENCE
(2020)
Article
Chemistry, Physical
Wenjun Yin, Duo Dong, Yongsheng Zhang, Tao Wang, Jiawei Wang, Carlos E. Romero, Wei-ping Pan
APPLIED SURFACE SCIENCE
(2020)
Article
Engineering, Environmental
Tao Wang, Shangfei He, Yongsheng Zhang, Jiawei Wang, Wei-Ping Pan
CHEMICAL ENGINEERING JOURNAL
(2020)
Article
Energy & Fuels
Tao Wang, Yihuan Yang, Jiawei Wang, Baharak Sajjadi, Wei-Yin Chen, Yongsheng Zhang, Wei-Ping Pan
Article
Environmental Sciences
Jiawen Wu, Tao Wang, Jiawei Wang, Yongsheng Zhang, Wei -Ping Pan
Summary: The study aimed to enhance the sorption ability of Pb and Cd by promoting ion exchange and precipitation capacities of biochar. Modification with magnesium significantly increased the adsorption capacity of Mg-coated biochar for Pb and Cd, dominantly through ion exchange and mineral precipitation mechanisms.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Chemistry, Physical
Duo Dong, Yongsheng Zhang, Yi Xiao, Tao Wang, Jiawei Wang, Wei Gao
Summary: This study successfully transformed low-rank coal into porous carbon materials with excellent electrochemical performance through a green mechanochemistry method combined with MgCO3 activation. The optimized porous carbon has high specific surface area and specific capacitance, making it suitable for the preparation of supercapacitors.
JOURNAL OF POWER SOURCES
(2021)
Article
Green & Sustainable Science & Technology
Jiawei Wang, Liyuan Liu, Siqi Li, Yang Chen, Tao Wang, Yongsheng Zhang
Summary: Flue gas mercury emissions from waste rotary kiln incineration plants in Northern China were sampled using different methods, with average concentrations of 13.38 +/- 4.08 mu g/Nm(3) and 18.66 +/- 8.19 mu g/Nm(3) reported. The study found that the uncertainty in Hg measurements of the raw feedstock contributed to fluctuations in flue gas Hg data. Results also showed that the scrubbing tower in the system could effectively remove Hg2+ from the flue gas, enhancing total Hg removal efficiencies.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Engineering, Environmental
Qixin Yuan, Yongsheng Zhang, Tao Wang, Jiawei Wang, Carlos E. Romero
Summary: Fly ash from coal-fired power plants is a major solid waste pollutant globally, and the mechanochemical method is effective in stabilizing heavy metals present in it. Both dry milling and wet milling methods can reduce the leaching rate of heavy metals significantly. Wet milling results in smaller fly ash particles, suggesting water weakens the agglomeration of fine particles.
Article
Green & Sustainable Science & Technology
Duo Dong, Yongsheng Zhang, Mengyuan Shan, Taozhu Yin, Tao Wang, Jiawei Wang, Wei Gao
Summary: Mechanochemistry is a green and sustainable technology that has the potential to be widely used in pollutant control and energy storage applications. By modifying materials and recovering valuable substances, it can capture trace elements and volatile organic compounds, degrade dioxins, solidify heavy metals, and prepare nano energy storage materials. This review highlights the potential applications of Mechanochemistry in environmental governance and energy storage, and identifies current challenges and research bottlenecks.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Green & Sustainable Science & Technology
Taozhu Yin, Yongsheng Zhang, Duo Dong, Tao Wang, Jiawei Wang
Summary: A MoS2/AC composite material was synthesized and demonstrated to effectively remove Cd2+ from wastewater, while exhibiting excellent selective adsorption in the presence of other ions. The material maintained high adsorption capacity even after multiple cycles and showed remarkable removal capability in actual wastewater.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Thermodynamics
O. Yongju, Yongsheng Zhang
Summary: This study estimated and compared the combustion characteristics index, apparent activation energy, and kinetics models of D.P.R Korea's anthracite (KA) in O-2/N-2 and O-2/CO2 atmospheres with different oxygen concentrations. The results showed that the combustion characteristics of KA were more reduced in the O-2/CO2 atmosphere compared to the O-2/N-2 atmosphere. The ignition, burnout, and comprehensive combustion indexes were similar in 21% O-2/79% N-2 and 30% O-2/70% CO2 atmospheres. The lowest apparent activation energy was recorded at 30% oxygen concentration in both O-2/N-2 and O-2/CO2 atmospheres. The kinetics models under different heating rates were estimated using the Kissinger-Akahira-Sunose (KAS) method, and the consistency between 21% O-2/79% N-2 and 30% O-2/70% CO2 atmospheres was further confirmed.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Energy & Fuels
O. Yongju, Yongsheng Zhang
Summary: This paper analyzed the synergistic effect of co-combustion of heavy fuel oil and DPR Korea's anthracite using thermogravimetric analysis (TGA). The results showed that the combustion stages of HFO and KA differed, and the co-combustion process could be divided into five stages. Experimental data comparison revealed that the synergistic effect was more pronounced when the co-combustion mixture had a high ratio of KA.
Article
Engineering, Chemical
Yafan Wang, Yongsheng Zhang, Tao Wang, Jiawei Wang
Summary: Coal-fired power plants are a major source of arsenic and selenium emissions, and the traditional method for treating desulfurization wastewater has not achieved zero emissions. The introduction of layer double hydroxides (LDHs) as a new adsorbent has potential drawbacks. However, by using the calcium oxide component in the conventional process, a method was developed to prepare LDHs from desulfurization solid waste and achieve high adsorption efficiency for arsenic and selenium removal. This breakthrough enables the secondary use of desulfurization waste and efficient heavy metal removal, contributing to the goal of zero emissions from coal-fired power plants.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Engineering, Environmental
Qixin Yuan, Xiayu Liu, Yi Xiao, Tao Wang, Jiawei Wang, Yongsheng Zhang
Summary: Bromide coupled mechanical modified (BMM) fly ash exhibits good mercury adsorption performance and environmental stability. Long-term stability experiments show that the mercury desorption rates of BMM fly ash and activated carbon (AC) are both less than 5% after being placed in the natural environment for one year. The presence of bromine in BMM fly ash improves its adsorption efficiency and stability, making it a promising adsorbent for mercury removal from flue gas in coal-fired power plants.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Energy & Fuels
Yingna Du, Chen Huang, Wei Jiang, Qiangwei Yan, Yongfei Li, Gang Chen
Summary: In this study, anionic surfactants modified hydrotalcite was used as a flow improver for crude oil under low-temperature conditions. The modified hydrotalcite showed a significant viscosity reduction effect on crude oil. The mechanism of the modified hydrotalcite on viscosity and pour point of crude oil was explored through characterization and analysis of the modified hydrotalcite and oil samples.
Article
Energy & Fuels
Mohammad Saeid Rostami, Mohammad Mehdi Khodaei
Summary: In this study, a hybrid structure, MIL-53(Al)@MWCNT, was synthesized by combining MIL-53(Al) particles and -COOH functionalized multi-walled carbon nanotube (MWCNT). The hybrid structure was then embedded in a polyethersulfone (PES) polymer matrix to prepare a mixed matrix membrane (MMM) for CO2/CH4 and CO2/N2 separation. The addition of MWCNTs prevented MIL-53(Al) aggregation, improved membrane mechanical properties, and enhanced gas separation efficiency.
Article
Energy & Fuels
Yunlong Li, Desheng Huang, Xiaomeng Dong, Daoyong Yang
Summary: This study develops theoretical and experimental techniques to determine the phase behavior and physical properties of DME/flue gas/water/heavy oil systems. Eight constant composition expansion (CCE) tests are conducted to obtain new experimental data. A thermodynamic model is used to accurately predict saturation pressure and swelling factors, as well as the phase boundaries of N2/heavy oil systems and DME/CO2/heavy oil systems, with high accuracy.
Article
Energy & Fuels
Morteza Afkhamipour, Ebad Seifi, Arash Esmaeili, Mohammad Shamsi, Tohid N. Borhani
Summary: Non-conventional amines are being researched worldwide to overcome the limitations of traditional amines like MEA and MDEA. Adequate process and thermodynamic models are crucial for understanding the applicability and performance of these amines in CO2 absorption, but studies on process modeling for these amines are limited. This study used rate-based modeling and Deshmukh-Mather method to model CO2 absorption by DETA solution in a packed column, validated the model with experimental data, and conducted a sensitivity analysis of mass transfer correlations. The study also compared the CO2 absorption efficiency of DETA solution with an ionic solvent [bmim]-[PF6] and highlighted the importance of finding optimum operational parameters for maximum absorption efficiency.
Article
Energy & Fuels
Arastoo Abdi, Mohamad Awarke, M. Reza Malayeri, Masoud Riazi
Summary: The utilization of smart water in EOR operations has gained attention, but more research is needed to understand the complex mechanisms involved. This study investigated the interfacial tension between smart water and crude oil, considering factors such as salt, pH, asphaltene type, and aged smart water. The results revealed that the hydration of ions in smart water plays a key role in its efficacy, with acidic and basic asphaltene acting as intrinsic surfactants. The pH also influenced the interfacial tension, and the aged smart water's interaction with crude oil depended on asphaltene type, salt, and salinity.
Article
Energy & Fuels
Dongao Zhu, Kun Zhu, Lixian Xu, Haiyan Huang, Jing He, Wenshuai Zhu, Huaming Li, Wei Jiang
Summary: In this study, cobalt-based metal-organic frameworks (Co-based MOFs) were used as supports and co-catalysts to confine the NHPI catalyst, solving the leaching issue. The NHPI@Co-MOF with carboxyl groups exhibited stronger acidity and facilitated the generation of active oxygen radicals O2•, resulting in enhanced catalytic activity. This research provides valuable insights into the selection of suitable organic linkers and broadens the research horizon of MOF hybrids in efficient oxidative desulfurization (ODS) applications.
Article
Energy & Fuels
Edwin G. Hoyos, Gloria Amo-Duodu, U. Gulsum Kiral, Laura Vargas-Estrada, Raquel Lebrero, Rail Munoz
Summary: This study investigated the impact of carbon-coated zero-valent nanoparticle concentration on photosynthetic biogas upgrading. The addition of nanoparticles significantly increased microalgae productivity and enhanced nitrogen and phosphorus assimilation. The presence of nanoparticles also improved the quality of biomethane produced.
Article
Energy & Fuels
Yao Xiao, Asma Leghari, Linfeng Liu, Fangchao Yu, Ming Gao, Lu Ding, Yu Yang, Xueli Chen, Xiaoyu Yan, Fuchen Wang
Summary: Iron is added as a flocculant in wastewater treatment and the hydrothermal carbonization (HTC) of sludge produces wastewater containing Fe. This study investigates the effect of aqueous phase (AP) recycling on hydrochar properties, iron evolution and environmental assessment during HTC of sludge. The results show that AP recycling process improves the dewatering performance of hydrochar and facilitates the recovery of Fe from the liquid phase.
Article
Energy & Fuels
He Liang, Tao Wang, Zhenmin Luo, Jianliang Yu, Weizhai Yi, Fangming Cheng, Jingyu Zhao, Xingqing Yan, Jun Deng, Jihao Shi
Summary: This study investigated the influence of inhibitors (carbon dioxide, nitrogen, and heptafluoropropane) on the lower flammability limit of hydrogen and determined the critical inhibitory concentration needed for complete suppression. The impact of inhibitors on explosive characteristics was evaluated, and the inhibitory mechanism was analyzed with chemical kinetics. The results showed that with the increase of inhibitor quantity, the lower flammability limit of hydrogen also increased. The research findings can contribute to the safe utilization of hydrogen energy.
Article
Energy & Fuels
Zonghui Liu, Zhongze Zhang, Yali Zhou, Ziling Wang, Mingyang Du, Zhe Wen, Bing Yan, Qingxiang Ma, Na Liu, Bing Xue
Summary: In this study, high-performance solid catalysts based on phosphotungstic acid (HPW) supported on Zr-SBA-15 were synthesized and evaluated for the one-pot conversion of furfural (FUR) to γ-valerolactone (GVL). The catalysts were characterized using various techniques, and the ratio of HPW and Zr was found to significantly affect the selectivity of GVL. The HPW/Zr-SBA-15 (2-4-15) catalyst exhibited the highest GVL yield (83%) under optimized reaction conditions, and it was determined that a balance between Bronsted acid sites (BAS) and Lewis acid sites (LAS) was crucial for achieving higher catalytic performance. The reaction parameters and catalyst stability were also investigated.
Article
Energy & Fuels
Michael Stoehr, Stephan Ruoff, Bastian Rauch, Wolfgang Meier, Patrick Le Clercq
Summary: As part of the global energy transition, an experimental study was conducted to understand the effects of different fuel properties on droplet vaporization for various conventional and alternative fuels. The study utilized a flow channel to measure the evolution of droplet diameters over time and distance. The results revealed the temperature-dependent effects of physical properties, such as boiling point, liquid density, and enthalpy of vaporization, and showed the complex interactions of preferential vaporization and temperature-dependent influences of physical properties for multi-component fuels.
Article
Energy & Fuels
Yuan Zhuang, Ruikang Wu, Xinyan Wang, Rui Zhai, Changyong Gao
Summary: Through experimental validation and optimization of the chemical kinetic model, it was found that methanol can accelerate the oxidation reaction of ammonia, and methanol can be rapidly oxidized at high concentration. HO2 was found to generate a significant amount of OH radicals, facilitating the oxidation of methanol and ammonia. Rating: 7.5/10.
Article
Energy & Fuels
Radwan M. EL-Zohairy, Ahmed S. Attia, A. S. Huzayyin, Ahmed I. EL-Seesy
Summary: This paper presents a lab-scale experimental study on the impact of diethyl ether (DEE) as an additive to waste cooking oil biodiesel with Jet A-1 on combustion and emission features of a swirl-stabilized premixed flame. The addition of DEE to biodiesel significantly affects the flame temperature distribution and emissions. The W20D20 blend of DEE, biodiesel, and Jet A-1 shows similar flame temperature distribution to Jet A-1 and significantly reduces UHC, CO, and NOx emissions compared to Jet A-1.
Article
Energy & Fuels
Jiang Bian, Ziyuan Zhao, Yang Liu, Ran Cheng, Xuerui Zang, Xuewen Cao
Summary: This study presents a novel method for ammonia separation using supersonic flow and develops a mathematical model to investigate the condensation phenomenon. The results demonstrate that the L-P nucleation model accurately characterizes the nucleation process of ammonia at low temperatures. Numerical simulations also show that increasing pressure and concentration can enhance ammonia condensation efficiency.
Article
Energy & Fuels
Shiyuan Pan, Xiaodan Shi, Beibei Dong, Jan Skvaril, Haoran Zhang, Yongtu Liang, Hailong Li
Summary: Integrating CO2 capture with biomass-fired combined heat and power (bio-CHP) plants is a promising method for achieving negative emissions. This study develops a reliable data-driven model based on the Transformer architecture to predict the flowrate and CO2 concentration of flue gas in real time. The model validation shows high prediction accuracy, and the potential impact of meteorological parameters on model accuracy is assessed. The results demonstrate that the Transformer model outperforms other models and using near-infrared spectral data as input features improves the prediction accuracy.