Article
Thermodynamics
Shirish Kumar Sharma, Anand M. Shivapuji, S. Dasappa
Summary: The high ash content of coal presents two challenges in conventional gasifiers: ash agglomeration and low-quality syngas. In this study, a novel two-stage gasification system is developed to address these challenges by strategically segregating oxidative pyrolysis and oxy-steam char gasification. This system allows for a wide range of ash content handling and provides explicit control over parameters like local temperatures.
APPLIED THERMAL ENGINEERING
(2024)
Article
Green & Sustainable Science & Technology
Wen-gang Huang, Shao-wei Zhang, Xin Lu, Shu-liang Wu, Jun Huang
Summary: This paper researched the distribution and characteristics of residual coal resources in China and its adaptability to underground coal gasification (UCG) technology. The study found that the average recovery rate of coal mines in China was low, with the majority of residual coal reserves occurring in North China at shallow burial depths. The primary coal type was bituminite. The study established a hierarchical evaluation model and applied it to industrial tests, showing that the model can provide a scientific reference for decision-making in UCG projects.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Economics
Lin Yang, Mao Xu, Jingli Fan, Xi Liang, Xian Zhang, Haodong Lv, Dong Wang
Summary: This study explores a non-fiscal incentive policy of granting extra electricity quotas to finance early CCS demonstration projects in China. It finds that coal-fired power plants can operate at a profit with CCS retrofitting if provided with extra electricity quotas, with the necessary quota ranging from 4709 to 7260 hours per year during the demonstration stage.
Article
Thermodynamics
Huan Liu, Wei Guo, Shuqin Liu
Summary: This study compares the techno-economic performance of UCG-H2 and SCG-H2, and finds that UCG-H2 has lower investment and cost advantages, especially without CCS. However, the economic feasibility of UCG-H2 is challenged when hydrogen market prices are low.
Article
Geosciences, Multidisciplinary
Run Chen, Yunxia Bao, Fengrong Lv, Fu Chen, Kunpeng Hu, Yajun Zhang
Summary: Coal measure energy production and reservoir space utilization are crucial for energy security and carbon neutrality. This study focuses on the technical approaches of low-carbon mining and coal reservoir space utilization to ensure the security of coal supply. The study found that the integration of underground coal gasification and carbon capture and sequestration (UCG-CCS) is an effective technology to improve energy efficiency and achieve China's carbon neutral target.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Engineering, Environmental
Rui Wang, Haoran Li, Wenjia Cai, Xueqin Cui, Shihui Zhang, Jin Li, Yuwei Weng, Xinke Song, Bowen Cao, Lei Zhu, Le Yu, Wei Li, Lin Huang, Binbin Qi, Weidong Ma, Jiang Bian, Jia Zhang, Yaoyu Nie, Jingying Fu, Jiutian Zhang, Can Wang
Summary: Although coal phase down has been recognized as crucial for climate objectives, there have been concerns over its impact on energy security and social development. Retrofitting coal power units with biomass and coal co-firing offers an alternative approach to mitigate these concerns and achieve negative CO2 emissions. This study focuses on helping China's coal power units make informed retrofit choices based on unit-level heterogeneity and resource spatial matching. The findings indicate that China has the potential to achieve significant negative CO2 emissions, with the cumulative total reaching 10.32 Gt by 2060.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Energy & Fuels
Liangliang Jiang, Shanshan Chen, Yanpeng Chen, Zhangxin Chen, Fenjin Sun, Xiaohu Dong, Keliu Wu
Summary: Underground coal gasification (UCG) has the prospect of tapping deep coal seams and reducing carbon emissions. However, there is limited experience in deep UCG development. This study constructed a large-scale 3D UCG model with an improved method and considered the effect of double-diffusive natural convection. The results showed that the improved method was beneficial for the development of UCG cavities in deep coal seams, and double-diffusive natural convection played an important role in cavity development and overall UCG performance.
Article
Environmental Sciences
Siyao Wang, Fu Chen, Yinghong Wang
Summary: The European energy crisis, caused by the conflict between Russia and Ukraine, has brought attention to the decarbonization of fossil energy sources. This study used integrated life cycle analysis and fixed-effect panel threshold model to analyze the CO2 emissions in different sectors and introduced underground coal gasification (UCG) and UCG-integrated gasification combined cycle (UCG-IGCC) technologies as innovative approaches. The study found that UCG-IGCC technology can be a complementary measure to mitigate CO2 emissions within a certain range of energy intensity, and the social cost of innovating coal production and utilization processes using UCG-IGCC technology is lower than phasing out coal-fired power plants using carbon prices.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Green & Sustainable Science & Technology
Hui-Ling Zhou, Semida Silveira, Bao-Jun Tang, Shen Qu
Summary: This study examines the optimal timing for investing in carbon capture retrofitting in co-firing power plants, determining it to be in the year 2033. The decision on investment timing is influenced by the waiting value, multiple uncertainties, and trade-offs. The conclusions provide decision-makers with strategies for adjusting the investment timing based on different expectations of market and technology developments.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Chemistry, Applied
Ruiqi Mu, Ming Liu, Junjie Yan
Summary: Supercritical water gasification (SCWG) is a promising technique to convert coal into hydrogen-rich syngas. Advanced exergy analysis shows that SCWG has a higher exergy efficiency compared to conventional (CG) and chemical looping gasification (CLG). The gasifier in SCWG process has the highest irreversibility caused by gasification reaction, but also has a high potential for avoidable exergy destruction. Additionally, parameters such as coal water slurry concentration (CWSC), gasification temperature, gasification pressure, and oxygen-coal ratio have significant effects on the performance of SCWG.
FUEL PROCESSING TECHNOLOGY
(2023)
Article
Chemistry, Applied
Jun Feng, Sumin Gu, Rong Zhang, Xuan Qu, Jicheng Bi
Summary: The effect of steam in crude gas on Co-Ca bimetal catalyzed coal hydrogasification was investigated using H2 and steam mixtures. The presence of steam significantly inhibited Co-Ca activity toward hydrogasification. This study provides insights for developing an inexpensive and effective process for coal to clean fuels.
FUEL PROCESSING TECHNOLOGY
(2023)
Review
Engineering, Chemical
Kechang Xie
Summary: The development of ACCI in China has made progress, but still faces challenges such as lack of strategic understanding, severe external constraints, and the need to address knowledge gaps in technology foundations and industry standards.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Green & Sustainable Science & Technology
Abdul Rahim Shaikh, Qinhui Wang, Yi Feng, Zohaib Sharif, Long Han, Kaikun Li, Zhongyang Luo
Summary: Carbon capture and sequestration (CCS) technology is essential for sustainable power generation from fossil fuels. Calcium looping gasification (CLG) is a novel energy technology that eliminates the need for CO2 capture, making it more energy efficient and cost-effective. The simulation and experimental results show that CLG combined cycle system has higher efficiency compared to traditional power plants, demonstrating its potential for future adaptation in advanced power generation.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2021)
Article
Green & Sustainable Science & Technology
Ke Ren, Tianzuo Zhang, Xianfeng Tan, Yijie Zhai, Yueyang Bai, Xiaoxu Shen, Yuke Jia, Jinglan Hong
Summary: This study analyzed the environmental performance of mainstream ammonia synthesis in China using the LCA method, and found that the pulverized coal entrained flow gasification technology showed superiority in reducing the environmental burden, especially in categories such as global warming, freshwater ecotoxicity, and water depletion.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Green & Sustainable Science & Technology
Jiaquan Li, Yi-Ming Wei, Lancui Liu, Xiaoyu Li, Rui Yan
Summary: This study evaluates the carbon footprint and cost of coal-based hydrogen production with and without CCS technology in China. The results show that CCS can significantly reduce the carbon footprint of coal to hydrogen, but it also increases the cost. China should promote the development of coal to hydrogen with CCS to meet the growing demand for hydrogen, at least before there is a breakthrough in hydrogen production from renewable electricity.
JOURNAL OF CLEANER PRODUCTION
(2022)
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.