Article
Chemistry, Multidisciplinary
Xiao Zhu, Rong Wang, Tianxu Shen, Laihong Shen
Summary: This study established a three-dimensional model of a chemical looping system and simulated its thermal characteristics, considering hydrodynamics and chemical reactions. The results show that adding baffles in the fuel reactor improves gas conversion capacity and CO2 concentration. However, the residence time of char particles is too short to be fully gasified, leading to reduced CO2 capture rate. By adjusting the structure and height, wall erosion and residual char entrainment can be controlled to enhance the CO2 capture rate.
Article
Energy & Fuels
Joseba Moreno, Sally L. Homsy, Max Schmid, Gunter Scheffknecht
Summary: This study investigated the multicyclic behavior of limestone in a 20 kWth CaL facility and analyzed the performance of the carbonator under various process variables. The carbonator design achieved high CO2 capture efficiencies and apparent carbonation rates within the investigated operating conditions. The proposed design could potentially be integrated into existing load-following power plants for more flexible usage of CaL systems.
Article
Green & Sustainable Science & Technology
Shaohua Du, Shouzheng Yuan, Qiang Zhou
Summary: The study focuses on the co-gasification of PET and coal in a fluidized bed reactor, taking into account variations in particle size, density, and devolatilization reaction rate modification. The model's effectiveness is verified by comparing simulation results with experimental data. Furthermore, the study discusses the impacts of inlet gas velocity, solid feed position, and initial particle size on hydrodynamics and co-gasification reaction.
Article
Engineering, Chemical
Qinwen Liu, Wenqi Zhong, Aibing Yu, Chi-Hwa Wang
Summary: With the improvement of the models for oxy-fuel co-firing, the adaptability of the models to the oxy-fuel atmosphere can be enhanced, and the accurate prediction of NO, N2O, SO2 emissions can be achieved. This study also provided valuable information for the design and operation control of oxy-fuel co-firing of coal and biomass in a fluidized bed.
Article
Chemistry, Applied
Haifeng Zan, Xiaoping Chen, Wenqi Zhong, Jiliang Ma, Daoyin Liu, Guoqing Lian, Pengfei Geng, Cai Liang
Summary: Pressurised circulating fluidized bed oxy-fuel combustion (PCFB-OFC) is a promising technology for CO2 capture due to its high carbon capture efficiency and net efficiency. However, there is a lack of comprehensive experimental studies on PCFB thermal state experimental devices. In this study, a 100 kWth PCFB-OFC experimental device was developed, and the effect of combustion pressure on various parameters was investigated. The results showed that increasing pressure improved combustion efficiency, temperature distribution, and reduced pollutant emissions.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Energy & Fuels
Eric Langner, Jens Kaltenmorgen, Christian Heinze, Jochen Stroehle, Bernd Epple
Summary: In the process of achieving climate-neutrality with low resource consumption, it is important for global economics to find ways to obtain high-quality products from existing material flows. Using waste as a feedstock for gasification allows the production of high-quality syngas, which can be used to create new products for various industries. The study focused on the gasification characteristics of solid recovered fuel (SRF) pellets and found that the quality of the syngas depends on the gasification temperature and the volatile content in the SRF fraction.
Article
Energy & Fuels
Imtenan Sayeed, M. A. Kibria, Sankar Bhattacharya
Summary: This paper studied the gasification kinetics of Victorian brown coal in a fluidized bed reactor simulating the conditions of a chemical looping combustion process. The experiments showed that the reaction rate in hematite bed was 42% faster compared with the reaction in a sand bed, with a total conversion time as low as 4.1 minutes at 950 degrees C. The increase in CO2 partial pressure at the vicinity of char particle was found to enhance the reaction rate in the case of hematite bed.
JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME
(2022)
Article
Engineering, Environmental
Qinwen Liu, Wenqi Zhong, Aibing Yu, Chi-Hwa Wang
Summary: Successful realization of stable, pressurized, and oxy-fuel combustion mode with coal and biomass mixtures as fuels in fluidized bed. Increasing combustion pressure and biomass blending ratio not only benefits better temperature distribution, more CO2 enrichment in flue gas, and higher combustion efficiency, but also reduces NOx and SO2 emissions.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Jing Yang, Yujie Ren, Jinsuo Lu, Hongpan Liu, Zhiqiang Zhang, Heliang Pang, Keomounlath Bounkhong
Summary: The study investigated a new PG-CuFe2O4 oxygen carrier for reducing lignite in Chemical Looping Gasification (CLG) process, successfully capturing H2S and producing syngas with high proportions of CO and H2. Experimental results showed that PG-CuFe2O4 had excellent H2S capture ability, with Fe3O4, Cu, and FeS playing important roles in the H2S capture during the reduction process.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Green & Sustainable Science & Technology
Lucio Zaccariello, Maria Laura Mastellone
Summary: This study investigated the impact of gasifying agent and bed material on the co-gasification performance of coal, plastic waste, and wood. The experiments were conducted using different reactant gases and bed materials in a lab-scale bubbling fluidized bed reactor. The results showed that both the gasifying agent and bed material significantly influenced the gas composition and overall process performance. The test with oxygen-enriched air and silica sand had the highest heating value of the producer gas, while the air/steam mixture and olivine had the best performance in terms of gas yield and tar reduction.
Article
Engineering, Chemical
Ramin Khodabandehlou, Hossein Askaripour
Summary: The study evaluates the influence of oxygen-to-steam ratio, wall boundary conditions, coal feeding rate, and static bed height on the product gas concentrations, heating values, and efficiencies in a tapered fluidized bed reactor. Results show that heating values vary slightly with oxygen-to-steam ratio, while efficiencies increase with the ratio but decline with higher coal feeding rates. Static bed height decreases heating values, and gas concentrations vary with different tapered angles.
Article
Energy & Fuels
Petteri Peltola, Falah Alobaid, Tero Tynjaelae, Jouni Ritvanen
Summary: This article provides a brief review of the modeling of chemical looping combustion (CLC), a next-generation CO2 capture technology, in bubbling and circulating fluidized bed reactors. The article presents a summary of published mathematical reactor models, with a focus on a macroscopic modeling approach that combines transport equations with semiempirical correlations to describe key fluidized bed phenomena. The article highlights important aspects to be considered in the modeling of CLC in a dual fluidized bed reactor system and identifies research needs. So far, semiempirical reactor models have been validated based on experimental results, but there is limited research on dynamic process simulation of CLC.
Article
Thermodynamics
Saurabh Gupta, Santanu De
Summary: This study investigates the gasification of low-grade, sub-bituminous coal in a pilot-scale bubbling fluidized bed reactor. The effects of equivalence ratio and steam/coal ratio on the composition of the syngas, carbon conversion, cold gas efficiency, and agglomeration behavior are studied.
Article
Green & Sustainable Science & Technology
Fangjun Wang, Wei Zhou, Shiyi Chen, Lunbo Duan, Wenguo Xiang
Summary: This study investigates the performance of the calcium looping process for biomass hydrogen-rich gasification and carbon dioxide capture. It shows that dolomite as bed material has a more significant improvement in hydrogen production compared to quartz sand. Furthermore, a higher temperature in the riser benefits tar conversion, and an increase in solid circulating flux improves hydrogen concentration and yield while reducing tar content.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Thermodynamics
Peng Jiang, Ashak Mahmud Parvez, Yang Meng, Xinyue Dong, Mengxia Xu, Xiang Luo, Kaiqi Shi, Tao Wu
Summary: A novel municipal solid waste-based power generation system was proposed in this study, achieving a high net electrical efficiency and exergy efficiency with efficient capture of carbon dioxide. The proposed system showed significant improvements in net electrical efficiency compared to other MSW incineration and/or gasification to power processes.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Agricultural Engineering
Jingchun Yan, Shouxi Jiang, Tao Song, Laihong Shen
Summary: The study enhanced the activity of LaFeO3 through Ba substitution, with La0.3Ba0.7FeO3 (L3B7F) showing the best performance in achieving efficient algae chemical looping catalytic steam gasification process.
BIOMASS & BIOENERGY
(2021)
Article
Energy & Fuels
Shouxi Jiang, Laihong Shen, Jingchun Yan, Xin Niu, Bin Hu, Lingchang Wang
Summary: This study investigated the effects of sodium on coal combustion and NOx emissions in Zhundong coal. The results showed that water-soluble sodium had negative effects on coal conversion and NO generation during traditional combustion. However, when chemical looping was applied to Zhundong coal combustion, the NO emission was largely restrained and mainly came from pyrolysis. Additionally, the gasification agent facilitated NO generation and CO2 had a stronger effect on chemical looping.
Article
Energy & Fuels
Rong Sun, Yan Xiao, Jingchun Yan, Laihong Shen, Hongcun Bai
Summary: The research aims to elucidate the reaction mechanisms of BaFe2O4 with solid carbon (C) and carbon monoxide (CO) during chemical looping gasification process. It was found that BaFe2O4 is more active in solid-solid reaction while Fe2O3 performs better in solid-gas reaction. The study suggests that BaFe2O4 has potential in CLG process due to its stronger surface activity and weaker lattice oxygen migration ability compared to Fe2O3.
Article
Environmental Sciences
Jingchun Yan, Linchao Hu, Weiguo Gao, Lei Yang, Linbo Qian, Lu Han, Mengfang Chen
Summary: This study evaluated the possibility of using green synthesized nanoscale zero valent iron (nZVI) activating persulfate (PS) for the degradation of 1,2-dichlorobenzene (1,2-DCB) in contaminated soil. The results showed that the nZVI/PS system effectively degraded 1,2-DCB with a high removal efficiency of total organic carbon (TOC). The study provides important implications for the remediation of 1,2-DCB contaminated soil using the nZVI/PS system.
JOURNAL OF SOILS AND SEDIMENTS
(2022)
Article
Environmental Sciences
Da Ouyang, Yun Chen, Ruihuan Chen, Wenying Zhang, Jingchun Yan, Mingyue Gu, Jing Li, Haibo Zhang, Mengfang Chen
Summary: The study showed that 1,4-dioxane degradation efficiency increased significantly with higher biochar pyrolysis temperatures in the biochar activated peroxymonosulfate (PMS) system. The optimized degradation efficiency of 1,4-dioxane was 89.2% in batch experiments and 70.2% in column experiments with continuous injections of 16.0 mM PMS.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Lei Yang, Jianing Shen, Wenying Zhang, Wenpei Wu, Zifei Wei, Mengfang Chen, Jingchun Yan, Linbo Qian, Lu Han, Jing Li, Mingyue Gu
Summary: A facile and scalable method was developed to synthesize stable and effective nano zero-valent iron (nZVI)-carbon composites for peroxymonosulfate (PMS) activation in groundwater. The composites exhibited excellent catalytic performance for the degradation of organic contaminants at a wide range of pH values, with potential for practical application in groundwater remediation.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Agricultural Engineering
Jingchun Yan, Yongbo Yan, Hang Zhou, Peng Wang, Laihong Shen, Li Yang
Summary: Chemical looping gasification (CLG) is an emerging technology for clean and efficient utilization of biomass. This study evaluated the performance of perovskite oxygen carriers with heterogeneous doping in biomass gasification, showing significant improvement in tar reduction and H2-enriched syngas production.
BIOMASS & BIOENERGY
(2022)
Article
Agricultural Engineering
Jingchun Yan, Junjie Lai, Kehan Yin, Yongbo Yan, Laihong Shen, Li Yang
Summary: Doped La-Fe-O perovskites were developed for microalgae chemical looping gasification (CLG), showing outstanding performance in syngas production. The perovskites facilitated the formation of NH3 and HCN, while iron ore converted precursors to NO. Below 400 degrees C, NOx can be stored on the perovskite surface, while above 700 degrees C, NOx can be selectively reduced by reducing components in tar or syngas under the catalysis of L3B7F, resulting in reduced NOx emissions. CLG over L3B7F may be a promising way to efficiently utilize microalgae and overcome nitrogen-related obstacles in biomass gasification technologies.
BIORESOURCE TECHNOLOGY
(2023)
Article
Environmental Sciences
Yuelin Xie, Qinfan Wang, Zihan Guo, Linbo Qian, Mengfang Chen, Jingchun Yan
Summary: In this study, S doped Fe2B was synthesized and used for enhanced dechlorination of trichlorethylene. The results showed that the degradation ratio and reaction rate of S doped Fe2B were significantly higher than those of undoped Fe2B. The major dechlorination products were observed through a reductive beta-elimination pathway. S doped Fe2B acted as an electron donor, increasing the density of localized unpaired electrons and enhancing the reducibility of Fe atoms.
ENVIRONMENT INTERNATIONAL
(2022)
Article
Energy & Fuels
Jingchun Yan, Yongbo Yan, Junjie Lai, Dongyan Jia, Yong Jiao, Xingyu Zhao, Li Yang
Summary: In this study, the co-gasification characteristics of municipal sewage sludge (MSS) and cotton stalk (CS) were investigated, and the syngas production was enhanced by using metal-rich texture dyeing sludge (TDS) pyrolysis residues as additives. The addition of TDS-600 resulted in a significant reduction in the activation energy of MSS/CS co-pyrolysis. The syngas yield increased with the rising temperature and steam volume fraction, but excessive steam at high temperature may decrease the syngas yield.
Article
Engineering, Environmental
Lei Yang, Zifei Wei, Zihan Guo, Mengfang Chen, Jingchun Yan, Linbo Qian, Lu Han, Jing Li, Mingyue Gu
Summary: CoFe2O4/hydrochar composites (FeCo@HC) were synthesized and used to activate peroxymonosulfate (PMS) for simultaneous degradation of monochlorobenzene (MCB) and p-chloroaniline (PCA). The effects of different factors and the degradation pathways of MCB and PCA were investigated. The results showed that FeCo@HC140-10/PMS system had higher removal efficiencies compared to FeCo@HC180-10/PMS and FeCo@HC220-10/PMS systems. Radical and nonradical pathways co-existed in the FeCo@HC140-10/PMS system, while dominant pathways differed for MCB and PCA degradation. The surface functional groups and Fe/Co redox cycles played crucial roles in PMS activation. The presence of MCB inhibited its degradation, but slightly promoted PCA degradation in the mixed MCB/PCA solution. These findings are important for the synthesis of bimetal-hydrochar composites and understanding the mechanisms of PMS activation for the removal of mixed contaminants in groundwater.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Green & Sustainable Science & Technology
Shouxi Jiang, Yongping Huang
Summary: To overcome the low energy efficiency of phase-change thermal storage technologies, this study proposes a novel leaf-like fin and a bioinspired latent heat exchanger (LHE) using phase change materials (PCMs). The results demonstrate that the innovative leaf-like fin significantly enhances the discharge performance, reducing the complete solidification time by 41.6% and increasing the average discharge power by 69.9% compared to conventional LHEs. Moreover, optimal material selections and operating conditions are recommended to further improve the heat discharge performance of PCMs.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2023)
Article
Engineering, Environmental
Yanzhi Li, Shi Liu, Kehan Yin, Dongyan Jia, Yundong Sun, Xueying Zhang, Jingchun Yan, Li Yang
Summary: The ABO(3)-type perovskite oxides have the advantages of being able to tailor the redox capability of transition metal elements in their lattice structure through a simple doping strategy, making them an ideal platform for catalytic combustion of VOCs. This study synthesized and analyzed a series of La1-xSrxCo1-yFeyO3 perovskites for toluene combustion. Among the catalysts, La0.5Sr0.5Co0.8Fe0.2O3-delta (LSCF) showed remarkable activity for toluene oxidation and exhibited superior stability. The outstanding catalytic activity of LSCF perovskite is attributed to the enhancement of redox ability, generation of oxygen vacancies, and activation of lattice oxygen species.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Chemical
Jingchun Yan, Weidong Liu, Rong Sun, Shouxi Jiang, Shen Wang, Laihong Shen
Summary: Oxygen carriers (OCs) with perovskite structure are attracting interest due to their high reactivity and redox tunability. LaNixFe1-xO3 perovskite OCs were synthesized in this study and tested for algae chemical looping gasification. LN5F5 showed stable performance and high syngas yield, making it a promising OC for biomass gasification. The study found that LN5F5 exhibited continuous high yield of syngas in the first 5 redox cycles.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2021)