Article
Energy & Fuels
Asma Ashraf, Hamed Sattar, Shahid Munir
Summary: The study showed that blending coal with agricultural residues can reduce NOx and SO2 emissions, while improving carbon burnout. Addition of different agricultural residues significantly decreased NOx emissions. Co-firing had a positive impact on reducing SO2 emissions, but there may be a risk of sulfur emissions in blends of agricultural residues with coal.
JOURNAL OF THE ENERGY INSTITUTE
(2022)
Article
Chemistry, Multidisciplinary
Alain Brillard, Patrick Gilot, Jean-Francois Brilhac, Valerie Tschamber
Summary: This study presents a simple model for simulating combustion processes in a drop tube furnace, which is much simpler than other available models. The model assumes that a coal char particle remains spherical during combustion and is based on two differential equations describing the evolution of particle temperature and oxygen concentration with respect to time. This model also provides access to local quantities to characterize the combustion process, and its validity is demonstrated through comparisons with experimental data.
APPLIED SCIENCES-BASEL
(2023)
Article
Energy & Fuels
Hassan Mohanna, Jean-Michel Commandre, Bruno Piriou, Benoit Taupin, Gilles Vaitilingom, David Honore
Summary: Experimental combustion and numerical modeling of raw and torrefied pine and demolition wood particles were conducted to determine the kinetics of devolatilization and oxidation. Different scenarios tested showed minor variations in devolatilization activation energy but significant differences in char oxidation activation energy. The influence of particle volume evolution and drag force models on the derived kinetic parameters were examined, revealing noticeable differences in particle temperature and other properties along the reactor axis.
Article
Energy & Fuels
Lingling Liu, Shibo Kuang, Lulu Jiao, Baoyu Guo, Aibing Yu
Summary: This study presents a numerical investigation on the effects of pulverized coal injection (PCI) in an industrial blast furnace. The results show that appropriate oxygen enrichment and suitable burden distribution can enhance the maximum operable PCI rate, while excessive oxygen enrichment increases coke consumption. The integrated model used in this study can serve as a cost-effective tool to optimize PCI effects on blast furnace performance.
Article
Energy & Fuels
Duarte Magalhaes, Feyza Kazanc
Summary: The study found that co-combustion of thermally pre-treated biomass and coal led to a significant reduction in PM2.5 emissions, approaching levels of biomass fuel, and the mechanisms for PM formation during combustion were found applicable to biomass-coal blends. The shift from fine to coarser particles during co-firing is likely to enable the capture of PM from biomass-coal co-firing by conventional coal-PM traps in existing coal power plants.
Article
Engineering, Chemical
Jiangyong He, Chong Zou, Junxue Zhao, Nan Yu, Yi Wang, Ruimeng Shi
Summary: This study compares and analyzes the combustion performance of semicoke compared to coal for pulverized coal injection (PCI) in a blast furnace. The results show that semicoke has better combustion performance in a drop tube furnace (DTF), and the influencing factors for combustion performance vary depending on the combustion conditions.
ASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Thermodynamics
Minsung Choi, Yeseul Park, Kaiwen Deng, Xinzhuo Li, Kibeom Kim, Yonmo Sung, Taegam Hwang, Gyungmin Choi
Summary: This paper presents an experimental investigation on the effects of the exhaust tube vortex (ETV) on pollutant emissions and carbon burnout performance. The results show that under the co-swirl condition, the ETV structure can reduce CO emissions and improve carbon burnout performance. Among the air staging positions, position 3 maintains the ETV structure in the primary combustion zone better and results in the lowest CO emissions, relatively low NOx emissions, and the highest carbon burnout performance.
Article
Energy & Fuels
D. A. Mortari, D. Perondi, G. B. Rossi, J. L. Bonato, M. Godinho, F. M. Pereira
Summary: Water leaching pretreatment effectively removes water-soluble inorganic constituents from RGP and significantly impacts the combustion efficiency of WLGP chars, leading to lower burnout efficiency and increased gas emissions.
Article
Thermodynamics
Halina Pawlak-Kruczek, Jakub Mularski, Michal Ostrycharczyk, Michal Czerep, Marcin Baranowski, Tadeusz Maczka, Krzysztof Sadowski, Patryk Hulisz
Summary: This study investigates the combustion of pulverized coal with unburned char recovered from the ash of an industrial boiler. Two plasma burners are installed to improve the combustion efficiency and reduce the amount of unburned fuel. CFD modeling and laboratory tests are used to analyze the combustion behavior, and the results show that the use of plasma burners improves the mixing and temperature distribution, resulting in higher temperatures at the combustion chamber outlet.
Article
Energy & Fuels
Yonghong Yan, Liutao Sun, Zhengkang Peng, Hongliang Qi, Li Liu, Rui Sun
Summary: The study on the effects of blend ratio on combustion and pollution emission characteristics in co-combustion of Shenmu pyrolyzed semi-char (SC) and Shenhua bituminous coal (SB) showed that the increase in blend ratio postpones ignition in the primary stage and lowers the burnout rate. With the blend ratio increasing, NO(x) emission at the furnace exit is smallest for the 30% blend ratio and highest for the 100% SC blend ratio.
FRONTIERS IN ENERGY
(2021)
Article
Thermodynamics
Christopher R. Shaddix, Ethan S. Hecht, Cristina Gonzalo-Tirado, Brian S. Haynes
Summary: Previous research has shown that CO2 and H2O gasification reactions play a significant role in the combustion of pulverized coal (pc) char, especially in oxy-fuel environments. This study aims to quantify the influence of CO2 gasification reaction by combining experimental measurements and simulations. The results demonstrate a consistent relationship between the gasification reaction rate and the char particle temperatures and burnout rates in oxy-fuel combustion environments.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Thermodynamics
Siqi Liu, Yanqing Niu, Liping Wen, Yaqian Kang, Yufeng Wang, Denghui Wang, Shi'en Hui
Summary: The study focuses on the impact of ash minerals and the mechanisms of ash film and ash dilution on char reactivity during the burnout stage. The research aims to provide detailed data on the variation of ash film fraction with carbon conversion ratio, and integrate it into the kinetic model to predict the behavior of ash minerals during combustion.
COMBUSTION AND FLAME
(2021)
Article
Metallurgy & Metallurgical Engineering
Fabian Perret, Alexander Babich, Dieter Senk
Summary: This article investigates the change in streaming conditions in different areas of a blast furnace when pulverized coal particles leave the raceway. Experiments were conducted using a physical model, and calculations were performed to evaluate the impact of pulverized coal on gas permeability in vertical and horizontal directions. The results provide insights for improving CFD modelling and prediction of char behavior in blast furnaces.
IRONMAKING & STEELMAKING
(2022)
Article
Energy & Fuels
Zhihao Yu, Jing Jin, Fengxiao Hou, Yunpeng Zhang, Guangxu Wang, Bojianzhi Liu, Zhongyuan Zhai
Summary: The combustion experiments of Zhundong coal in a drop tube furnace (DTF) revealed significant changes in slagging tendency predictions with a novel phosphorus-based additive, resulting in higher ash fusion points and a more advantageous ash deposit morphology. At temperatures of 1000°C and 1150°C, phosphate complex salts like Na2CaMg7(PO4)(6) were found in the ash deposits, demonstrating the phosphorus-based additive's effectiveness in inhibiting low temperature eutectic mixtures and improving ash deposition characteristics of Zhundong coal.
Article
Energy & Fuels
Sheng-Yen Hsu, Shan-Wen Du, Yuan-Yi Yang, Chien-Hsiung Tsai, Wei-Hsin Chen
Summary: The blast furnace ironmaking process is energy-consuming, and the use of pulverized coal injection (PCI) technique can reduce CO2 emissions. This study focuses on the conveying solid-gas ratio (SGR) and oxygen enrichment in a PCI system using a lance-blowpipe-tuyere-raceway model. The results show that optimizing SGR and oxygen enrichment can significantly improve coal combustion.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Correction
Chemistry, Applied
Jia Liu, Juntong Dong, Xiaodan Li, Teng Xu, Zhenguo Li, Jeffrey Dankwa Ampah, Mubasher Ikram, Shihai Zhang, Chao Jin, Zhenlong Geng, Tianyun Sun, Haifeng Liu
FUEL PROCESSING TECHNOLOGY
(2024)
Article
Chemistry, Applied
Seba Alareeqi, Daniel Bahamon, Kyriaki Polychronopoulou, Lourdes F. Vega
Summary: This study explores the potential application of single-atom-alloy (SAA) catalysts in bio-oils hydrodeoxygenation refining using density functional theory (DFT) and microkinetic modeling. It establishes the relationships between stability, adsorptive properties, and activity structures for bio-oil derivatives, providing guidance for the synthesis of cost-effective SAA combinations.
FUEL PROCESSING TECHNOLOGY
(2024)
Article
Chemistry, Applied
Bin Hu, Wen -Ming Zhang, Xue-Wen Guo, Ji Liu, Xiao Yang, Qiang Lu
Summary: This study explored the pyrolysis behaviors and mechanisms of different monosaccharides, including arabinose, galactose, galacturonic acid, and glucuronic acid. The roles of structural differences in these monosaccharides were analyzed, and it was found that glucuronic acid undergoes a special C-C bond breaking reaction during pyrolysis. The findings provide a deep understanding of the pyrolysis chemistry of hemicellulose and the role of different branches.
FUEL PROCESSING TECHNOLOGY
(2024)
Review
Chemistry, Applied
Youwei Zhi, Donghai Xu, Guanyu Jiang, Wanpeng Yang, Zhilin Chen, Peigao Duan, Jie Zhang
Summary: Hydrothermal carbonization (HTC) is an effective method for the harmless disposal of municipal sludge (MS) and offers potential applications for the obtained products. Optimizing reaction conditions, coupling with other waste materials, and combining different processes can improve the performance of HTC. Furthermore, HTC contributes to energy recovery and enhances the quality of life cycle assessment.
FUEL PROCESSING TECHNOLOGY
(2024)
Article
Chemistry, Applied
Jia Wang, Jianchun Jiang, Dongxian Li, Xianzhi Meng, Arthur J. Ragauskas
Summary: This study presents a scalable process for converting holocellulose and cellulosic wastes into advanced oxygen-containing biofuels with high furan, cyclic ketone, and ethanol content. By combining hydropyrolysis and vapor-phase hydrodeoxygenation using Pd/Al2O3 as a catalyst, the researchers achieved high yields and conversions. The integrated process holds great promise for biomass waste conversion into advanced biofuels.
FUEL PROCESSING TECHNOLOGY
(2024)
Article
Chemistry, Applied
Florian Held, Jannis Reusch, Steffen Salenbauch, Christian Hasse
Summary: The accurate prediction and assessment of soot emissions in internal combustion engines are crucial for the development of sustainable powertrains. This study presents a detailed quadrature-based method of moments (QMOM) soot model coupled with a state-of-the-art flow solver for the simulation of gasoline engines. The model accurately describes the entire cause-and-effect chain of soot formation, growth and oxidation. Experimental validation and engine cycle simulations are used to identify the root cause of observed soot formation hotspots.
FUEL PROCESSING TECHNOLOGY
(2024)