Article
Energy & Fuels
Yu Shi, Xianzhi Song, Yanjun Feng
Summary: The study shows that optimizing the geometrical parameters of lateral wells, such as length, spacing, and number, is crucial for enhancing the performance of multilateral-well EGS. Longer lateral wells and larger well spacing are beneficial for improving the EGS performance, while the number of wells should be optimized based on the specific discrete fracture network. The research provides valuable guidance for the design of lateral wells in multilateral-well EGS.
Article
Green & Sustainable Science & Technology
Xuefeng Gao, Yanjun Zhang, Yibin Huang, Yongjie Ma, Yi Zhao, Qiangbin Liu
Summary: Understanding flow and heat transfer in fractured geothermal reservoirs is crucial for the future development of enhanced geothermal systems (EGS). A thermal-hydraulic coupled model was proposed to evaluate heat extraction performance of multilateral wells in fractured reservoirs. Results showed minimal impact of increasing number of branch wells on production temperature but significant impact on well pressure.
Article
Energy & Fuels
Xin-Yue Duan, Di Huang, Wen-Xian Lei, Shi-Chao Chen, Zhao-Qin Huang, Chuan-Yong Zhu
Summary: This paper presents a numerical study on thermal energy mining from hot dry rock using an enhanced geothermal system. The effects of fracture morphology, fluid injection rate, and well spacing on heat recovery capacity are investigated. Increasing the well spacing is found to be an effective way to improve thermal extraction performance of the EGS.
Article
Thermodynamics
Feng Liu, Yong Kang, Yi Hu, Hao Chen, Xiaochuan Wang, Haizeng Pan, Jiaqiao Xie
Summary: The heat extraction performances of N2O-EGS and CO2-EGS are almost the same under the same conditions, and better than H2O-EGS. A lower injection temperature is conducive to the heat extractions of N2O-EGS and CO2-EGS, while the production pressure, injection mass flow rate should be designed reasonably according to the actual situation.
APPLIED THERMAL ENGINEERING
(2022)
Article
Engineering, Geological
Zhijun Wu, Wenjun Cui, Lei Weng, Quansheng Liu
Summary: One controversial issue associated with enhanced geothermal systems is induced seismicity. This study investigates the triggering mechanisms of potential fault activation during geothermal heat extraction and finds that thermal effects play a crucial role in controlling fault slip behavior and illuminating the triggering mechanism of unexpected seismic activities.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Engineering, Geological
Tianjiao Li, Chun'an Tang, Jonny Rutqvist, Mengsu Hu
Summary: This study presents a coupled thermal-hydraulic-mechanical (THM) model for simulating failure processes in geological media. The model links stress/strain with heat transfer and fluid flow, and the capability of the TOUGH-RFPA simulator was verified by benchmark problems and demonstrated for modeling cooling-induced damage around a deep geothermal well.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Thermodynamics
Bo Zhang, Zhanqing Qu, Tiankui Guo, Mao Sheng, Ming Chen, Jiwei Wang, Yunpeng Wang, Chang Guo
Summary: This study analyzes the importance of hydraulic fractures in heat extraction based on fractal theory. The key factors affecting heat extraction are found to be a higher fracture number, fracture length, and a staggered fracture layout. Recommendations are also made for fracture length ratio, aperture ratio, and distance between the primary fracture and lateral well.
APPLIED THERMAL ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Gaosheng Wang, Xianzhi Song, Yu Shi, Ruiyue Yang, Feixue Yulong, Rui Zheng, Jiacheng Li
Summary: The novel multilateral-well coaxial closed-loop geothermal system (CCGS) provides a solution to the high-cost fracturing and environmental issues by closed-loop circulation, and significantly increases heat production through lateral wellbores. A new 3D transient model is established and validated with experimental data.
Article
Green & Sustainable Science & Technology
L. Santos, A. Dahi Taleghani, D. Elsworth
Summary: This paper discusses the feasibility of repurposing abandoned oil and gas wells for the recovery of low-grade geothermal energy, and presents solutions and guidelines based on this concept. The challenges faced and potential remedies are also discussed. Pilot projects and feasibility studies globally confirm the viability of this concept, paving the way for future innovations.
Article
Energy & Fuels
Tingyu Li, Dongxu Han, Fusheng Yang, Jingfa Li, Daobing Wang, Bo Yu, Jinjia Wei
Summary: In this paper, a combination of embedded discrete fracture model (EDFM) and extended finite element method (XFEM) is proposed to address the challenge of dense grids in thermal hydraulic-mechanical (THM) coupling simulations. By significantly reducing the grid number, the computational efficiency is improved while maintaining relatively high accuracy. The proposed model is validated by comparing it with analytical solutions and COMSOL, and is applied to analyze pressure, temperature, and displacement evolutions in hypothetical EGS scenarios.
Article
Thermodynamics
Manojkumar Gudala, Suresh Kumar Govindarajan, Bicheng Yan, Shuyu Sun
Summary: This study proposes an improved mathematical model to investigate the temperature variations and mechanical strain in the Puga geothermal reservoir. It is found that there are low-temperature regions within the fractures, and the number of hydraulic fractures and well patterns significantly influence the rock and fluid properties. The proposed mathematical model can effectively evaluate and predict the changes in the reservoir.
Article
Thermodynamics
Jingxuan Xie, Jiansheng Wang, Xueling Liu
Summary: In this study, a three-dimensional enhanced geothermal system (EGS) with pinnate horizontal well structure is proposed to improve the heat extraction performance. Numerical investigations show that the production temperature and total heat production of EGS with pinnate horizontal well increase significantly compared to conventional EGS with a doublet system. Design parameters such as main well bore number and length are positively correlated with heat extraction performance.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Kaixuan Wang, Zaobao Liu, Tao Zeng, Fei Wang, Wanqing Shen, Jianfu Shao
Summary: This paper investigates the heat extraction performance of an enhanced geothermal system (EGS) under the influence of injection-production parameters and reservoir properties. A thermal-hydro-mechanical (THM) coupled model is used to quantify the complicated heat extraction process, and three-dimensional geothermal reservoir models are established to study the impact of fracture numbers. The results show the importance of optimizing fractures and the dominance of injection mass flow rate, fracture permeability, and injection temperature in affecting heat extraction performance. The findings have practical implications for the efficient construction and operation of EGS.
APPLIED THERMAL ENGINEERING
(2022)
Article
Engineering, Civil
Silvia De Simone, Benoit Pinier, Olivier Bour, Philippe Davy
Summary: Modeling heat transfer in complex heterogeneous fractured systems is crucial for geothermal energy applications. A new semi-analytic formulation has been proposed to evaluate the contribution of the rock matrix in diffusive heat exchange and thermal contraction/expansion, impacting the advective heat transfer and fracture aperture variation. This method has been proven accurate and robust, allowing for studying reservoir behavior and optimizing geothermal performance effectively.
JOURNAL OF HYDROLOGY
(2021)
Article
Thermodynamics
Jiayan Ji, Xianzhi Song, Guofeng Song, Fuqiang Xu, Yu Shi, Zehao Lv, Shuang Li, Junlin Yi
Summary: In this study, a coupled thermal-hydraulic-chemical-deformation (THCD) model is established to investigate the fracture deformation mechanism. The results show that the deformation of the fracture is controlled by the reaction rate and the influence of temperature on fracture deformation is complex and governed by the mineral reaction kinetics.
Article
Thermodynamics
Yu Shi, Xianzhi Song, Jiacheng Li, Gaosheng Wang, Feixue YuLong, Lidong Geng
APPLIED THERMAL ENGINEERING
(2019)
Article
Green & Sustainable Science & Technology
Yu Shi, Xianzhi Song, Gaosheng Wang, Jiacheng Li, Lidong Geng, Xiaojiang Li
Article
Energy & Fuels
Yu Shi, Xianzhi Song, Guofeng Song
Summary: Geothermal productivity prediction is crucial for managing geothermal systems. This study proposes a novel LSTM and MLP combinational neural network, which shows good accuracy and generalization ability in forecasting geothermal productivity.
Article
Energy & Fuels
Yu Shi, Xianzhi Song, Yanjun Feng
Summary: The study shows that optimizing the geometrical parameters of lateral wells, such as length, spacing, and number, is crucial for enhancing the performance of multilateral-well EGS. Longer lateral wells and larger well spacing are beneficial for improving the EGS performance, while the number of wells should be optimized based on the specific discrete fracture network. The research provides valuable guidance for the design of lateral wells in multilateral-well EGS.
Article
Thermodynamics
Gaosheng Wang, Xianzhi Song, Chao Yu, Yu Shi, Guofeng Song, Fuqiang Xu, Jiayan Ji, Zihao Song
Summary: This study proposes a novel hydrothermal open-loop geothermal system and establishes a numerical model to analyze its performance. The results indicate that the novel system has significant advantages in the exploitation of multi-layer reservoirs and can improve energy efficiency.
Article
Green & Sustainable Science & Technology
Guofeng Song, Xianzhi Song, Fuqiang Xu, Gensheng Li, Gaosheng Wang, Jiayan Ji, Yu Shi
Summary: This study investigates the impact of chemical reactions on the operation of an enhanced geothermal system. The research findings highlight the significance of injection concentration (cin) as an efficient way to adjust geothermal production, while injection temperature (Tin) has little influence on chemical reactions.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Thermodynamics
Jiayan Ji, Xianzhi Song, Fuqiang Xu, Guofeng Song, Yu Shi, Gaosheng Wang, Zihao Song, Shuang LI
Summary: This paper investigates the influence of water thermophysical properties on the thermal performance of geothermal systems. The study validates a fully coupled wellbore-reservoir model and explores the impact of engineering methods on system performance. The results indicate that open-hole length and production pressure significantly affect system pressure and thermal power.
APPLIED THERMAL ENGINEERING
(2022)
Article
Engineering, Geological
Fuqiang Xu, Yu Shi, Xianzhi Song, Gensheng Li, Zihao Song, Shuang Li
Summary: This study investigated the fracture damage characteristics and laws of hot dry rocks (HDRs) in geothermal energy through experiments and simulations. The results showed that the morphology and volume of fractures significantly increased with temperature and stress difference. The findings provide guidance for optimizing schemes and enhancing heat extraction.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Thermodynamics
Yu Shi, Yulong Zhang, Xianzhi Song, Qiliang Cui, Zhihong Lei, Guofeng Song
Summary: This paper thoroughly analyzes the evolution of kerogen pyrolysis with reservoir temperature distribution based on a numerical model. It investigates the effects of injection energy rate, well shut-in measure, reservoir pressure, and well spacing on the production performance of oil shale in-situ exploitation. The results provide meaningful suggestions for optimizing operational parameters in terms of injection energy utilization efficiency and oil output.
Article
Thermodynamics
Fuqiang Xu, Xianzhi Song, Guofeng Song, Jiayan Ji, Zihao Song, Yu Shi, Zehao Lv
Summary: Geothermal is an important renewable energy source, but high drilling costs hinder its widespread adoption. The oilfield area has abundant geothermal resources and a large number of high-temperature abandoned wells. Converting these abandoned wells into geothermal wells is an economic and effective method. However, most research on heat extraction from abandoned wells focuses on single-well closed systems, while the commonly used system in oilfields is a well patterns open system, which involves the flow and heat extraction of oil-water multiphase. This article highlights the importance of numerical simulation and scheme optimization in oilfield geothermal research.
Article
Thermodynamics
Jiayan Ji, Xianzhi Song, Guofeng Song, Fuqiang Xu, Yu Shi, Zehao Lv, Shuang Li, Junlin Yi
Summary: In this study, a coupled thermal-hydraulic-chemical-deformation (THCD) model is established to investigate the fracture deformation mechanism. The results show that the deformation of the fracture is controlled by the reaction rate and the influence of temperature on fracture deformation is complex and governed by the mineral reaction kinetics.
Article
Green & Sustainable Science & Technology
Yu Shi, Qiliang Cui, Xianzhi Song, Shaomin Liu, Zijiang Yang, Junlan Peng, Lizhi Wang, Yanchun Guo
Summary: The aquifer thermal energy storage (ATES) system is an efficient method to address the energy supply-demand gap. Heat storage and preservation abilities play a crucial role in the success of ATES projects. However, previous studies have mainly focused on heat storage and recovery, neglecting the heat preservation ability of aquitards. Additionally, the effects of key factors on heat losses into aquitards and the appropriate selection of reservoirs for heat storage remain unclear. This study comprehensively evaluates ATES thermal performance by defining heat loss efficiency, analyzing the effects of key factors, and recommending optimal reservoirs for heat storage.
Review
Construction & Building Technology
Mengsi Deng, Pengxin Zhang, Yazhou Nie, Yu Shi, Hanyu Yang, Dan Wu, Xing Rong, Rongjiang Ma
Summary: Combustion of solid fuel in traditional cookstoves leads to significant air pollution. Improving pollutant emissions from biomass cookstoves is crucial. This study reviews the literature from 2000 to 2022, summarizes testing methods and evaluation indicators, and identifies emission factors for carbon monoxide (CO), nitrous oxides (NOx), and particulate matter (PM). The findings reveal that factors such as combustion phase, fuel properties, cookstove type, air supply structure, and refueling operation significantly influence emissions. This review provides valuable insights for cleaner biomass cookstove design and manufacturing.
ENERGY AND BUILDINGS
(2023)
Article
Thermodynamics
Zhihong Lei, Yulong Zhang, Zijiang Yang, Yu Shi, Hongyuan Zhang, Xiaojiang Li, Qiliang Cui
Summary: This paper compares in-situ steam heating and electrical heating methods for oil shale exploitation. The results show that steam injection heating has superior output, energy consumption, and production cycle compared to electrical heating. The flow rate and temperature of the injected steam, as well as the specific heat capacity of oil shale, have a significant impact on productivity. Thermal conductivity and porosity have less influence on mining efficiency. Additionally, different well pattern structures also affect productivity.
APPLIED THERMAL ENGINEERING
(2024)
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.