Article
Energy & Fuels
Jingkun Han, Dunxi Yu, Jianqun Wu, Xin Yu, Fangqi Liu, Minghou Xu
Summary: Torrefaction has different effects on the ash slagging behavior during biomass and coal co-combustion. Co-firing biomass with high-Ca coal reduces the ash slagging rate, while co-firing biomass with high-Si/Al coal exacerbates the slagging tendency. Torrefaction can reduce the ash slagging rate of sawdust but increase it for other fuels. Measures such as optimizing operation conditions, co-firing with high-Ca coals, and using additives are suggested to alleviate the ash slagging during torrefied herbaceous biomass combustion.
Article
Energy & Fuels
Jingkun Han, Dunxi Yu, Jianqun Wu, Xin Yu, Fangqi Liu, Minghou Xu
Summary: Torrefaction technology has positive effects on ash fouling during biomass combustion and co-combustion. The interactions between fuels during co-combustion inhibit the formation of inside fouling deposits while the incorporation of alkalis in aluminosilicates promotes the growth of outside deposits. Torrefaction reduces the formation of chlorides and sulfates, thus inhibiting the inside deposition. However, the elemental repartitioning during torrefaction leads to more retention of alkalis, which aggravates the formation of mixed aluminosilicates and favors the outside deposition.
Article
Energy & Fuels
Shuanghui Deng, Houzhang Tan, Bo Wei, Xuebin Wang, Fuxin Yang, Xiaohe Xiong
Summary: This study investigated the combustion characteristics of Zhundong coal, coal gangue, and their blends using thermogravimetric analysis and analytical instruments. The optimal blending ratio for better combustion performance was determined to be 30% coal gangue added into Zhundong coal. The results provide reference for burning blended high ash coal in a large pulverized Zhundong coal boiler for safety and economy.
Article
Engineering, Environmental
Jinhao Zheng, Lei Liao, Rui Liu, Chongcong Li, Yan Zhang
Summary: This study explored a promising approach to co-manage torrefaction condensates (TCs) and carbon-rich fly ash (FA), finding that the blending of FA and TC improved CO2 gasification reactivity and combustion performance of the resulting mixtures.
Article
Thermodynamics
Lin Mu, Tong Li, Zhen Wang, Yan Shang, Hongchao Yin
Summary: This study investigated the ash slagging behavior of bituminous coal and two aquatic biomasses through co-firing tests. It was found that pretreatment, especially acid washing, effectively reduced the slagging tendency of the ash by removing S and alkali metals. The SO2 emissions during co-firing were significantly higher than those from burning coal alone.
Article
Green & Sustainable Science & Technology
Ming Zhai, Xuesong Li, Di Yang, Zhaoyang Ma, Peng Dong, Zhen Leng
Summary: The melting of ash during biomass pellet combustion affects combustion efficiency. This study evaluated the characteristics of ash formation and melting of various biomass fuels. The aggregation of fusible matters was identified as the main factor affecting ash fusion, which inhibited combustion reaction but promoted carbon conversion.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Thermodynamics
Yanyu Qiao, Zhichao Chen, Xiaolan Wu, Zhengqi Li
Summary: This paper investigates the combustion, thermal conversion, and kinetic analyses of semi-coke blending with bituminous coal under oxygen-enriched conditions. The ignition and burnout temperatures are reduced under 30% O2 atmosphere compared to 20% O2 atmosphere. Oxygen-enriched conditions can effectively improve the combustion performance of the mixture. The synergy effect of the co-combustion process is different under different oxygen atmospheres.
Article
Energy & Fuels
Liangqian Zheng, Jing Jin, Zhongyi Liu, Xuesen Kou, Xiang He, Long Shen
Summary: The co-combustion of coagulation sludge and Zhundong coal in circulating fluidized bed combustion can convert waste to energy and mitigate fouling and slagging problems. The ash fusion characteristics and sodium content were analyzed, and it was found that blending coagulation sludge effectively decreased the release of alkali metal sodium and inhibited low temperature eutectic. Iron salts in the blends generated low melting point substances, causing the blends ash to shrink at lower temperatures. The co-combustion of coagulation sludge and Zhundong coal is suitable for boilers with operation temperature under 1000 degrees C.
Article
Thermodynamics
Lang Liu, Shan Ren, Jian Yang, Donghai Jiang, Junjiang Guo, Yubao Pu, Xianpiao Meng
Summary: The co-combustion of biomass and coal gangue can reduce SO2 emissions and decrease ash fouling/slagging tendency. Research findings suggest that at a CG blending ratio <40%, K mainly forms K2SO4 and KAlSi3O8, while at a CG blending ratio >40%, it mainly forms KAlSi3O8.
Article
Energy & Fuels
Yaqiang Yuan, Haibin Zuo, Jingxiu Wang, Yan Gao, Qingguo Xue, Jingsong Wang
Summary: In this study, the co-combustion characteristics and ash fusion temperatures of clean coal, biomass pellet, and their blends were investigated. The results show that mixing the two fuels improves their combustion performance with an obvious synergistic effect. The best effect was achieved when the biomass pellet mixing ratio was 60%. Increasing the heating rate promotes synergy. Through analyzing the properties of the ash, it was determined that a biomass blending ratio of 40-60% is most conducive to the efficient utilization of the two fuels.
Article
Thermodynamics
Peng Jiang, Yang Meng, Ashak Mahmud Parvez, Xin-yue Dong, Xin-yun Wu, Meng-xia Xu, Cheng Heng Pang, Cheng-gong Sun, Tao Wu
Summary: The combustion characteristics and ash fusion behaviours of Qinghai coal and Fushun oil shale, as well as their blends, were studied. It was found that the blends exhibited good combustion performance in terms of ignition and burnout indices, with combustion temperature having the most significant impact on thermogravimetric mass loss. The addition of oil shale was shown to mitigate slagging and fouling tendencies in Qinghai coal combustion.
Article
Energy & Fuels
Yanchi Jiang, Takehito Mori, Hiroshi Naganuma, Yoshihiko Ninomiya
Summary: The co-firing of bituminous coal with woody biomass was studied to reduce carbon emissions and control particle emissions. The experiment showed that the addition of biomass could increase or maintain the particle emissions during co-firing, depending on the combination of coal and biomass. A mathematical method was developed to predict and verify particle emissions during co-firing, and it was found that the addition of biomass could increase the proportion of sticky particles and suppress the emissions of fine particles (PM2.5). The study also showed that the formation of liquid substance played a crucial role in controlling particle formation.
Article
Thermodynamics
Ruidong Zhao, Jianguang Qin, Tianju Chen, Jinhu Wu
Summary: The combustion behaviors and pollutants emission characteristics during co-combustion of bituminous coal semicoke and lignite were investigated. The addition of lignite improved the combustion performance and high heating rate increased the combustion intensity. The lignite blend ratio affected the combustion process and emission characteristics.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Chemistry, Applied
Thomas Allguren, Klas Andersson, Andrew Fry, Eric G. Eddings
Summary: This study investigated the combustion behavior of biomass with different pre-treatments and studied the formation of NOx in co-firing experiments. The results showed that the amount of fuel-bound nitrogen in coal is higher than that in biomass fuels, resulting in higher NO formation. Further analysis revealed that the distribution of volatile nitrogen species varied in the biomass co-firing cases, which was suggested as the main reason for the observed difference in NO formation.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Energy & Fuels
Chuandong Ma, Xiaoteng Li, Jianqiao Lyu, Meng He, Zhenhua Wang, Lin Li, Xiaofang You
Summary: The effects and mechanisms of CGFS-CWS preparation, combustion, and ash fusion were investigated. Increasing CGFS content led to higher slurry viscosity but improved slurry stability. The improved stability was attributed to the stronger negative charge on the CGFS surface, facilitating particle dispersion. Combustion experiments showed that CGFS incorporation significantly lowered the burnout temperature and increased the maximum combustion rate of the slurry. Addition of CGFS also reduced the ash fusion temperature by promoting melting-assisting effects.
Article
Green & Sustainable Science & Technology
Cameron Bracken, Nathalie Voisin, Casey D. Burleyson, Allison M. Campbell, Z. Jason Hou, Daniel Broman
Summary: This study presents a methodology and dataset for examining compound wind and solar energy droughts, as well as the first standardized benchmark of energy droughts across the Continental United States (CONUS) for a 2020 infrastructure. The results show that compound wind and solar droughts have distinct spatial and temporal patterns across the CONUS, and the characteristics of energy droughts are regional. The study also finds that compound high load events occur more often during compound wind and solar droughts than expected.
Article
Green & Sustainable Science & Technology
Ning Zhang, Yanghao Yu, Jiawei Wu, Ershun Du, Shuming Zhang, Jinyu Xiao
Summary: This paper provides insights into the optimal configuration of CSP plants with different penetrations of wind power by proposing an unconstrained optimization model. The results suggest that large solar multiples and TES are preferred in order to maximize profit, especially when combined with high penetrations of wind and photovoltaic plants. Additionally, the study demonstrates the economy and feasibility of installing electric heaters (EH) in CSP plants, which show a linear correlation with the penetration of variable energy resources.
Article
Green & Sustainable Science & Technology
M. Szubel, K. Papis-Fraczek, S. Podlasek
Article
Green & Sustainable Science & Technology
J. Silva, J. C. Goncalves, C. Rocha, J. Vilaca, L. M. Madeira
Summary: This study investigated the methanation of CO2 in biogas and compared two different methanation reactors. The results showed that the cooled reactor without CO2 separation achieved a CO2 conversion rate of 91.8%, while the adiabatic reactors achieved conversion rates of 59.6% and 67.2%, resulting in an overall conversion rate of 93.0%. Economic analysis revealed negative net present worth values, indicating the need for government monetary incentives.
Article
Green & Sustainable Science & Technology
Yang Liu, Yonglan Xi, Xiaomei Ye, Yingpeng Zhang, Chengcheng Wang, Zhaoyan Jia, Chunhui Cao, Ting Han, Jing Du, Xiangping Kong, Zhongbing Chen
Summary: This study investigated the effect of using nanofiber membrane composites containing Prussian blue-like compound nanoparticles (PNPs) to relieve ammonia nitrogen inhibition of rural organic household waste during high-solid anaerobic digestion and increase methane production. The results showed that adding NMCs with 15% PNPs can lower the concentrations of volatile fatty acids and ammonia nitrogen, and increase methane yield.
Article
Green & Sustainable Science & Technology
Zhong Ge, Xiaodong Wang, Jian Li, Jian Xu, Jianbin Xie, Zhiyong Xie, Ruiqu Ma
Summary: This study evaluates the thermodynamic, exergy, and economic performance of a double-stage organic flash cycle (DOFC) using ten eco-friendly hydrofluoroolefins. The influences of key parameters on performance are analyzed, and the advantages of DOFC over single-stage type are quantified.
Article
Green & Sustainable Science & Technology
Nicolas Kirchner-Bossi, Fernando Porte-Agel
Summary: This study investigates the optimization of power density in wind farms and its sensitivity to the available area size. A novel genetic algorithm (PDGA) is introduced to optimize power density and turbine layout. The results show that the PDGA-driven solutions significantly reduce the levelized cost of energy (LCOE) compared to the default layout, and exhibit a convex relationship between area and LCOE or power density.
Article
Green & Sustainable Science & Technology
Chunxiao Zhang, Dongdong Li, Lin Wang, Qingpo Yang, Yutao Guo, Wei Zhang, Chao Shen, Jihong Pu
Summary: In this study, a novel reversible liquid-filled energy-saving window that effectively regulates indoor solar radiation heat gain is proposed. Experimental results show that this window can effectively reduce indoor temperature during both summer and winter seasons, while having minimal impact on indoor illuminance.
Article
Green & Sustainable Science & Technology
Alessandro L. Aguiar, Martinho Marta-Almeida, Mauro Cirano, Janini Pereira, Leticia Cotrim da Cunha
Summary: This study analyzed the Brazilian Equatorial Shelf using a high-resolution ocean model and found significant tidal variations in the area. Several hypothetical barrages were proposed with higher annual power generation than existing barrages. The study also evaluated the installation effort of these barrages.
Article
Green & Sustainable Science & Technology
Francesco Superchi, Nathan Giovannini, Antonis Moustakis, George Pechlivanoglou, Alessandro Bianchini
Summary: This study focuses on the optimization of a hybrid power station on the Tilos island in Greece, aiming to increase energy export and revenue by optimizing energy fluxes. Different scenarios are proposed to examine the impact of different agreements with the grid operator on the optimal solution.
Article
Green & Sustainable Science & Technology
Peimaneh Shirazi, Amirmohammad Behzadi, Pouria Ahmadi, Sasan Sadrizadeh
Summary: This research presents two novel energy production/storage/usage systems to reduce energy consumption and environmental effects in buildings. A biomass-fired model and a solar-driven system integrated with photovoltaic thermal (PVT) panels and a heat pump were designed and assessed. The results indicate that the solar-based system has an acceptable energy cost and the PVT-based system with a heat pump is environmentally superior. The biomass-fired system shows excellent efficiency.
Article
Green & Sustainable Science & Technology
Zihao Qi, Yingling Cai, Yunxiang Cui
Summary: This study aims to investigate the operational characteristics of the solar-ground source heat pump system (SGSHPS) in Shanghai under different operation modes. It concludes that tandem operation mode 1 is the optimal mode for winter operation in terms of energy efficiency.
Article
Green & Sustainable Science & Technology
L. Bartolucci, S. Cordiner, A. Di Carlo, A. Gallifuoco, P. Mele, V. Mulone
Summary: Spent coffee grounds are a valuable biogenic waste that can be used as a source of biofuels and valuable chemicals through pyrolysis and solvent extraction processes. The study found that heavy organic bio-oil derived from coffee grounds can be used as a carbon-rich biofuel, while solvent extraction can extract xantines and p-benzoquinone, which are important chemicals for various industries. The results highlight the promising potential of solvent extraction in improving the economic viability of coffee grounds pyrolysis-based biorefineries.
Article
Green & Sustainable Science & Technology
Luiza de Queiroz Correa, Diego Bagnis, Pedro Rabelo Melo Franco, Esly Ferreira da Costa Junior, Andrea Oliveira Souza da Costa
Summary: Building-integrated photovoltaics, especially organic solar technology, are important for reducing greenhouse gas emissions in the building sector. This study analyzed the performance of organic panels laminated in glass in a vertical installation in Latin America. Results showed that glass lamination and vertical orientation preserved the panels' performance and led to higher energy generation in winter.
Article
Green & Sustainable Science & Technology
Zhipei Hu, Shuo Jiang, Zhigao Sun, Jun Li
Summary: This study proposes innovative fin arrangements to enhance the thermal performance of latent heat storage units. Through optimization of fin distribution and prediction of transient melting behaviors, it is found that fin structures significantly influence heat transfer characteristics and melting behaviors.