Article
Thermodynamics
Xiaoyu Zhang, Shujun Zhu, Jianguo Zhu, Yuhua Liu, Jiahang Zhang, Jicheng Hui, Hongliang Ding, Xiaoyang Cao, Qinggang Lyu
Summary: In this study, anthracite was preheated using a circulating fluidized bed under different atmospheres, and the preheating and combustion characteristics were investigated. The preheated char showed improved structural characteristics, such as increased BET surface area and small aromatic rings, under the O2/CO2 and O2/CO2/H2O atmospheres compared to the O2/N2 atmosphere, particularly when the oxygen concentration was 31%. HCN was found to be the main NOx precursor during preheating under different atmospheres. Additionally, a comprehensive evaluation method for ignition and stable combustion characteristics of preheated fuel was proposed, considering the minimum thermal power required for preheated char combustion and the combustion heat of preheated coal gas as the main factors. The highest combustion efficiency of anthracite was 98.85% under the O2/N2 atmosphere (with oxygen concentrations of 31.0%, 36.0%, and 35.0% for primary, secondary, and tertiary gases), and the lowest NO emission in the tail flue gas was 24.24 mg/MJ under air atmosphere.
Article
Chemistry, Physical
Ahmad Shaker, Seyed Abdolmehdi Hashemi, E. Ebrahimi Fordoei
Summary: This study numerically investigates the Moderate or Intense Low-oxygen Dilution (MILD) combustion of a syngas fuel under different conditions. The results show that the chemical and physical effects of replacing N2 with CO2 have different influences on flame structure, ignition delay time, and heat release rate under different preheating temperatures. The sensitivity analysis reveals that certain reactions are responsible for lower heat release rate and higher ignition delay time in oxy-fuel MILD combustion.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Thermodynamics
Qili Qiu, Yunan Zhou, Jianzhong Liu, Wei Shi, Weijuan Yang
Summary: Under different pressure conditions, the ignition and combustion processes of aluminum in a mixed O2/CO2 atmosphere exhibit distinct characteristics. An increase in pressure leads to a reduction in ignition delay time, as well as an increase in combustion temperature and heat release rate. Different reaction mechanisms were observed under high- and low-pressure conditions.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Engineering, Chemical
Chenhuan Xu, Yongmin Zhang, Yun-Lei Peng, Tianlei Yang, Zhe Liu, Feng Qiu, Adefarati Oloruntoba, Shuai Jiang
Summary: In this study, the stability of a resin-based solid amine sorbent in a circulating fluidized bed temperature swing adsorption (CFB-TSA) process was evaluated. Thermal degradation, CO2-induced degradation and oxidative degradation were identified as possible types of degradation. The presence of water molecules was found to alleviate oxidative and CO2-induced degradation.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Chemistry, Applied
Lucas F. A. S. Zafanelli, Adriano Henrique, Hendryk Steldinger, Jose L. Diaz de Tuesta, Jan Glaesel, Alirio E. Rodrigues, Helder T. Gomes, Bastian J. M. Etzold, Jose A. C. Silva
Summary: The applicability of 3D-printed activated carbons for CO2 capture in post-combustion streams and the influence of activation conditions on CO2 uptake and CO2/N2 selectivity were studied. The results showed that higher burnoff during activation increased the adsorption capacity of CO2 and N2, while lower burnoff led to higher selectivity of CO2 over N2. The study also proposed modeling approaches for describing single and multicomponent adsorption equilibrium, and demonstrated the working capacity and stability of the carbon.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Energy & Fuels
Jianping Yang, Qin Li, Wenbing Zhu, Wenqi Qu, Min Li, Zhengyong Xu, Zequn Yang, Hui Liu, Hailong Li
Summary: This study utilized the abundant mineral chalcopyrite as an efficient trap for Hg-0 sequestration, showing excellent removal performance in a wide temperature range and minimal interference from typical flue gas components. The adsorption capacity and rate of CuFeS2 were significantly higher than commercial activated carbons, attributed to the oxidizing and immobilizing abilities of disulfide ligands, and the sorbent could be regenerated through thermal decomposition, saving operation costs. CuFeS2 is identified as a potential, cost-effective trap for efficient remediation of Hg-0 from coal combustion flue gas.
Article
Energy & Fuels
Sheng Qi, Zhihua Wang, Mario Costa, Yong He, Kefa Cen
Summary: The ignition and combustion characteristics of biomass and lignite particles were found to be homogeneous, while bituminous coal and anthracite particles ignited heterogeneously. Biomass particles ignited earlier than coal particles and the ignition delay time decreased with increasing volatile content in coal. Replacing N2 with CO2 delayed the ignition of all solid fuels and extended the burnout time of volatiles, leading to less intense combustion in a CO2/O2 environment compared to N2/O2 due to lower binary diffusivity of O2 in CO2 and higher volumetric heat capacity of CO2.
Article
Energy & Fuels
A. Mack, J. Maier, G. Scheffknecht
Summary: This study aims to gather experimental data on the combustion behavior of single wood particles under oxyfuel conditions. The focus is to understand how the application of oxyfuel technology affects the conditions in fuel beds and provide data for simulations. Combustion experiments were conducted on spherical particles of different sizes with varying oxygen concentrations in different atmospheres. The results showed that combustion times were generally shorter under oxyfuel conditions compared to air conditions, and increasing oxygen concentration further reduced combustion durations. The temperatures of the flame and the particles increased with higher oxygen concentration, with smaller particles showing higher values. Steam concentration had a varying effect on temperatures.
Article
Energy & Fuels
Yuhua Liu, Jingzhang Liu, Qinggang Lyu, Jianguo Zhu, Fei Pan
Summary: In this study, the microstructure changes of fuel during preheating process were analyzed to reveal the impact on particle change behavior during combustion. It was found that during preheating, the main forms of N, C, and O elements in coal were pyrrole, hydrocarbon, and carbon-oxygen single bond respectively.
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)
Article
Chemistry, Multidisciplinary
Jianlu Zheng, Xiangdong Xing, Zhuogang Pang, Sunxuan Wang, Yueli Du, Ming Lv
Summary: A method of continuous treatment with Na2CO3 solution, HF solution, and CO2 was proposed for the regeneration of exhausted activated carbon, with optimal conditions identified for effectively removing inorganic compounds blocking the pores, maintaining high adsorption performance and regeneration efficiency.
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
Jose Francisco Gonzalez Alvarez, Efren Alonso Fernandez
Summary: This study analyzes the flow field during combustion using oxy-combustion in conditions similar to Matiant combustion chambers. Methodology involves CFD simulations with detailed reaction mechanisms and models, considering different working fluids and pressures. Findings show that temperature differences decrease with increasing operating pressure in Matiant cycles.
Article
Environmental Sciences
Che-Jung Hsu, Yan-Ze Xiao, Hsing-Cheng Hsi
Summary: Seawater flue gas desulfurization is effective in controlling sulfur dioxide emissions and removing mercury from coal-fired power plant flue gases. However, issues such as environmental impact and re-emission of gaseous mercury need to be addressed. The study found that copper/sulfur co-impregnated activated carbon can capture aqueous mercury and inhibit gaseous mercury re-emission effectively.
Article
Engineering, Chemical
Mikhail Gorbounov, Ben Petrovic, Serap Ozmen, Peter Clough, Salman Masoudi Soltani
Summary: Climate change and global warming, caused by anthropogenic CO2 emissions, is recognized as the largest threat to global ecosystems. Utilizing biomass ash from combustion as a source for activated carbon production not only valorizes waste into value-added products, but also provides an abundant and cost-effective material for post-combustion carbon capture. This research focuses on the preparation and characterization of biomass ash-derived activated carbon with optimized yield and CO2 uptake, achieving nearly double the adsorption capacity compared to virgin biomass ash-derived carbon.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Energy & Fuels
Hui Wang, Shen Wang, Yufeng Duan, Ya-ning Li, Yuan Xue, Zhanfeng Ying
Article
Energy & Fuels
Hui Wang, Yufeng Duan, Zhanfeng Ying, Yuan Xue
Article
Energy & Fuels
Hui Wang, Haotian Shen, Chang Shen, Ya-ning Li, Zhanfeng Ying, Yufeng Duan
Article
Biotechnology & Applied Microbiology
Hui Wang, Chang Shen, Yufeng Duan, Zhanfeng Ying, Ya-Ning Li
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2019)
Article
Energy & Fuels
Chang Shen, Hui Wang, Haotian Shen, Jianfei Wu, Yiming Zhu, Wei Shi, Xudong Zhang, Zhanfeng Ying
Article
Engineering, Chemical
Jingmao Wu, Hui Wang, Haotian Shen, Chang Shen, Yiming Zhu, Jianfei Wu, Hengyuan Ran
Summary: Experimental results showed that a low-level of H2O had a promoting effect on the adsorption of H-0, and high-level of H2O had an inhibiting effect. A high concentration of H2O would form a water film on the surface of sorbent traps to hinder the removal of external mass transfer on H-0.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Engineering, Chemical
Hengyuan Ran, Hui Wang, Jingmao Wu, Yiming Zhu, Jianfei Wu, Haotian Shen
Summary: This study investigated the interference effect of H2O on mercury removal in an oxyfuel-combustion atmosphere. The presence of H2O along with other gases affected the mercury removal process and exhibited different behaviors in various atmospheric conditions.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
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
Energy & Fuels
Xudong Zhang, Qingshan Zeng, Hui Wang
Summary: The study investigates the effects of SO2, HCl, and NO on mercury removal from carbon-based materials in oxy-fuel combustion flue gas. Experimental and theoretical analyses suggest that co-modification with NH4Br and HNO3 can enhance mercury removal efficiency, while the introduction of HCl and NO can mitigate the inhibitory effect of SO2.
Article
Energy & Fuels
Kang Yang, Hui Wang, Qingshan Zeng, Hengyuan Ran, Jingmao Wu, Jianfei Wu, Dong Liu
Summary: In this study, a biomass sorbent was prepared using rice husk and CuCl2 solution. Different concentrations of modification solution were used to explore the mercury removal ability of rice husk. The sorbent showed the best mercury removal capacity with 0.15 mol/L CuCl2 solution modified rice husk coke at an inlet mercury concentration of 54.4 μg/m(3) at 150 degrees C. The purpose of this work is to explore a novel approach for the efficient use of agricultural waste and provide technical support and theoretical guidance for its application in industry.
Article
Energy & Fuels
Qingshan Zeng, Hui Wang, Hengyuan Ran, Jingmao Wu, Kang Yang
Summary: A new mercury adsorbent was prepared using rice husk char and co-modification of acid and halogen for mercury removal in the oxy-combustion atmosphere. The combined modified char showed better mercury removal performance despite having a smaller specific surface area compared to chars modified by HNO3 and NH4Br alone. XPS analysis revealed that co-modification effectively promoted the formation of C-O* and C-Br. The addition of O and Br atoms on the carbonaceous surface in the form of covalent compounds induced stronger electronegativity and facilitated the chemical adsorption of Hg-0 by surrounding C atoms.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2023)
Article
Engineering, Chemical
Qingshan Zeng, Hui Wang, Kang Yang, Lingyan Le, Yiwen Zhang, Jingmao Wu, Hengyuan Ran, Yiming Zhu, Dong Liu
Summary: A study was conducted to investigate the use of corn stalk coke as an adsorbent for removing mercury from coal-fired flue gas. Three different adsorbents were prepared by sulfur modification combined with water vapor activation, and their mercury removal performance was evaluated. The results showed that the CSC-H2O-S adsorbent had the highest mercury removal efficiency. Through various analyses, it was found that water vapor activation improved the adsorbent's pore structure and surface area, while sulfur modification enhanced its chemical adsorption performance.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Energy & Fuels
Lingyan Le, Hui Wang, Qingshan Zeng, Kang Yang, Yiwen Zhang, Hengyuan Ran, Dong Liu
Summary: This study proposes using acid-chlorine-modified rice straw coke as an adsorbent for the removal of mercury pollution from coal-fired power plants. The modification increases surface pore structure and oxygen-containing functional groups, enhancing the adsorbent's mercury removal capacity. The optimal effect is achieved at an acid-chlorine ratio and mass ratio of 1:2, and the reaction temperature and inlet mercury concentration significantly impact mercury removal efficiency. The adsorption process is primarily controlled by surface mass transfer and chemisorption, with Cl and O atoms playing important roles in facilitating mercury removal.
Article
Energy & Fuels
Hui Wang, Shen Wang, Yufeng Duan, Ya-ning Li, Zhanfeng Ying
JOURNAL OF THE ENERGY INSTITUTE
(2019)
