Article
Thermodynamics
Zhengdong Liu, Xiaoson Lin, Wancheng Zhu, Ze Hu, Congmeng Hao, Weiwei Su, Gang Bai
Summary: Permeability rebound and recovery during the permeability evolution process is an important behavior affected by temperature and reservoir pressure changes. A binary gas permeability evolution model was used to study the dynamic evolution of various parameters during CO2 injection into CH4-containing coal at different temperatures. The study found that permeability shows a complex evolution over time, with the time required for rebound and recovery increasing with temperature. Monitoring gas migration patterns revealed that CO2 flow rate and cumulative storage volume decrease with increased rebound and recovery time. The study proposed using the stage-pressure injection method to increase CO2 injection effect.
Article
Energy & Fuels
Mohammadreza Zare Reisabadi, Mohammad Sayyafzadeh, Manouchehr Haghighi
Summary: This study investigates the effects of matrix swelling and well trajectory on permeability in coal seam gas reservoirs during CO2 injection. The results show that vertical injection wells experience a significant decline in permeability due to swelling, while horizontal wells do not.
Article
Thermodynamics
Kang Chen, Xianfeng Liu, Baisheng Nie, Chengpeng Zhang, Dazhao Song, Longkang Wang, Tao Yang
Summary: CO2 injection into coal seams enhances coalbed methane recovery and achieves CO2 geological sequestration. Supercritical CO2 (SC-CO2) interactions with coal alter pore structure and mineral compositions, increasing gas adsorption and storage capacity.
Article
Energy & Fuels
Sivachidambaram Sadasivam, Shakil Masum, Min Chen, Kamil Stanczyk, Hywel Thomas
Summary: This study explores the CO2 adsorption-desorption kinetics of bituminous coal under low pressure injection and compares different models to fit the data. The results suggest that bulk pore diffusion, surface interaction, and multilayer adsorption are the rate-determining steps.
Article
Energy & Fuels
Jianwei Tian, Jishan Liu, Derek Elsworth, Yee-Kwong Leong, Wai Li
Summary: In this study, a dual-fractal permeability model was proposed to investigate the impacts of coal internal structure on permeability. The model considers the effects of pore-fracture size distribution and effective stress, and incorporates multiple flow mechanisms.
Article
Energy & Fuels
Guanglei Zhang, P. G. Ranjith, Xuehai Fu, Xin Li
Summary: The study reveals that lignite has well-developed mesopores and macropores, while fractures are more pronounced in bituminous and anthracite coals. After treatment with ScCO2, lignite showed slight changes in mesopores and macropores, while bituminous and anthracite coals exhibited increased mesopores, macropores, and fractures connectivity. The study suggests that ScCO2 has the potential to increase coal porosity and permeability, providing additional pathways for carbon storage and methane recovery.
Article
Chemistry, Multidisciplinary
Qianqian Ma, Hong Li, Kun Ji, Fengjun Huang
Summary: CO2 injection technology into coal seams enhances CH4 recovery and reduces greenhouse gas emissions. The Thermal-Hydraulic-Mechanical coupling mechanism of CO2 injection into coal seams is investigated, considering competitive adsorption, diffusion, and seepage flowing of CO2 and CH4. Numerical simulations based on the Canadian CO2-ECBM project reveal that CO2 injection significantly improves methane production. Injection pressure and temperature have an impact on CH4 production and CO2 storage, with increasing pressure increasing production but weakening injection capacity, and increasing temperature slightly decreasing production and storage.
APPLIED SCIENCES-BASEL
(2023)
Article
Energy & Fuels
Huihui Liu, Bin Yu, Baiquan Lin, Quangui Li, Junhui Mou, Xiaolei Wang
Summary: This study proposes a new permeability model considering the coupling effect of effective stress and internal interaction between matrix and cleat. Experimental results show that horizontal stress increases linearly with increasing pore pressure, and gas sorption behavior can be described by a Langmuir-like equation.
Article
Energy & Fuels
Qianqian Ma, Shuaiwu Gou, Hong Li, Zhilin Cao, Hyundon Shin
Summary: This article focuses on the impact of CO2 phase transition within the wellbore in the CO2-ECBM project. Through numerical simulation and experimental data verification, it is found that the injection temperature has a significant influence on the CO2 phase state, and different phase transition processes may occur at different temperatures. Additionally, it is predicted that supercritical CO2 might exist at the bottom of the wellbore during long-term injection.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2022)
Article
Engineering, Environmental
Erlei Su, Yunpei Liang, Quanle Zou, Minghan Xu, Agus P. Sasmito
Summary: The study focused on the evolution of permeability during coalbed methane extraction, observing the influence of initial gas pressure, diffusion coefficient, and permeability on permeability rebound and recovery. The results showed that higher initial gas pressure led to longer rebound and recovery times, while initial diffusion coefficient and permeability had a negative impact on these parameters.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
Review
Energy & Fuels
Wancheng Zhu, Shuyuan Liu, Xiufeng Zhang, Chenhui Wei
Summary: This paper provides a comprehensive review of the mechanisms and properties of gas adsorption in coal, the geomechanical behavior of coal, and the mechanisms of gas transport in coal. It also discusses several waterless fracturing techniques for improving coalbed permeability and identifies current knowledge and research gaps.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2022)
Article
Thermodynamics
Jun Li, Qiming Huang, Gang Wang, Enmao Wang, Shuang Ju, Cunli Qin
Summary: Slickwater fracturing has a significant impact on the pore structure of coal seams, resulting in a decrease in pore volume and specific surface area, as well as severe blockage of micropores by residual liquid. The development of a gel breaker suitable for slickwater can improve the flowback effect and reduce reservoir damage.
Article
Energy & Fuels
Lei Zhang, Jinghua Li, Junhua Xue, Cun Zhang, Xinqiu Fang
Summary: This study examined the changing characteristics of gas flow capacity in ECBM, finding that the differences between CO2 and N2 tests affect the outflow rate, volumetric strain, and duration of each stage in permeability. The observation of different characteristics in the two tests provides new insight into the behavior of gas flow in coal reservoirs.
Article
Energy & Fuels
Xiangliang Zhang, Baiquan Lin, Jian Shen
Summary: The study found that plasma based on the principle of electrical breakdown can enhance the permeability of loaded coal, with the formation of interconnected fracture networks significantly increasing coal permeability. The changes in flow state from Darcy flow to non-Darcy flow after breakdown also facilitate fluid migration in coal.
Article
Energy & Fuels
Sijian Zheng, Yanbin Yao, Shuxun Sang, Dameng Liu, Meng Wang, Shiqi Liu
Summary: This study investigates the dynamic characteristics of multiphase methane in CO2-ECBM through the use of self-designed nuclear magnetic resonance measurement. The results show that the injection of CO2 improves the desorption efficiency of adsorbed methane. The CO2-CH4 displacement rates vary in different stages, and a low concentration ratio of CH4/CO2 significantly enhances methane recovery.
Article
Engineering, Chemical
Jian Chen, Jiahe Shen, Jie Guo, Geoff Wang
Summary: Vibrating separation is an important method for liquid-solid separation. This study investigated the effect of vibration parameters in separation based on numerical simulation of large-scale liquid bridge breakage. The results showed that separation efficiency increased significantly with the peak acceleration, but growth slowed down after exceeding 1 m/s^2.
Article
Energy & Fuels
Yunsong Yu, Chen Zhang, Chenyang Zhou, Jingfeng Zhang, Zaoxiao Zhang, Geoff G. X. Wang
Summary: The single atom fluid, developed as a new solvent, shows promising performance in capturing CO2, as validated by experiments against the theoretical model. The effects of temperature, pressure, and weight fraction on CO2 capture efficiency are carefully studied and concluded to improve with the use of the advanced solvent.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Engineering, Chemical
Jian Chen, Zhenjiang You, Ognjen Orozovic, Geoff Wang
Summary: This paper developed a model based on the Richards equation to quantitatively analyze the effect of oscillation on water distribution in unsaturated coal and iron ores. The findings suggest that the dynamic potential plays a role in the water distribution and can be applied to optimize the processing of coal and iron ores.
Review
Engineering, Chemical
Taofeeqah A. Agbaje, Lourdes F. Vega, Maryam Khaleel, Kean Wang, Georgios N. Karanikolos
Summary: C4 hydrocarbons are important fractions in the oil and gas processing industry, and traditional methods for their separation face challenges. Therefore, new technologies such as membranes and adsorption are being actively explored as efficient, economical, and energy-saving alternatives for the separation of C4 hydrocarbons.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Thermodynamics
Luke Henderson, Pradeep Shukla, Victor Rudolph, Suresh K. Bhatia
Summary: A 2-D population balance model with internal variables of carbon mass and surface sites was developed to study soot formation during hydrocarbon decomposition reactions. The model accurately predicts the size and composition distribution of soot particles under various conditions, which was confirmed by experimental data.
COMBUSTION AND FLAME
(2022)
Article
Energy & Fuels
Difei Zhao, Yinghai Guo, Geoff Wang, Xin Guan, Xueqing Zhou, Jing Liu
Summary: The influence of high-rank coal's pore characteristics on the physical properties, gas-bearing properties, and exploitation of coal reservoirs is becoming more prominent. This research analyzed the structure and fractal characteristics of reservoir pores in high-rank coal samples and established a natural classification system to describe the relationship between pore types and gas occurrence and transport mechanisms.
Article
Engineering, Chemical
Chen Zhang, Xinhua Xie, Yuan Li, Teng Zhang, Pengfei Ma, Yunsong Yu, Geoff Wang, Yongzhi Zhao
Summary: This work proposes solutions to resolve catalyst deactivation caused by fly ash in SCR denitration systems using a deflector at the economizer outlet and an ash blocking device at the ash hopper outlet. New integrated models are developed to analyze the gas and solid flow field in a SCR reactor, and have been validated by particle image velocimetry experiment. The study finds that the use of curved deflectors effectively improves the distribution of fly ash and shows the best rectification effect.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Review
Engineering, Chemical
Fahmi Anwar, Maryam Khaleel, Kean Wang, Georgios N. Karanikolos
Summary: Ethylene, a crucial feedstock for key compounds like polymers, is mainly produced from naphtha steam cracking, but unwanted traces of ethane are present. Energy-intensive methods are used to obtain pure ethylene, making the development of materials for ethylene-ethane separation by adsorption important yet challenging due to the compounds' similar properties.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Engineering, Chemical
Xiaotong Cao, Kean Wang, Xianshe Feng
Summary: In this study, zeolitic imidazolate framework (ZIF-71) crystals were incorporated into poly(ether-block-amide) (PEBA) to form mixed matrix membranes (MMMs) for the pervaporative removal of phenol and aniline from their aqueous solutions. The results showed that the ZIF-71/PEBA MMMs exhibited good compatibility and enhanced selectivity for phenol and aniline separation. The study highlights the potential application of ZIF-71/PEBA MMMs as organophilic membranes for efficient removal of aromatic contaminants.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Green & Sustainable Science & Technology
Maryam Khaleel, Zhou He, Georgios N. Karanikolos, Xianshe Feng, Kean Wang
Summary: This paper investigates the permeation properties of binary gas mixtures through a carbon molecular sieve membrane and finds a significant correlation between the permeation properties and gas composition. The study also reveals that the 'true' permeation properties of the membrane deviate from 'ideal' values and exhibit concentration-dependent selectivity. This dependence can be modeled and analyzed using the Maxwell-Stefan Equation.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2022)
Article
Engineering, Environmental
Thomas Buckley, Kavitha Karanam, Han Han, Hoang Nhat Phong Vo, Pradeep Shukla, Mahshid Firouzi, Victor Rudolph
Article
Engineering, Environmental
Baosong Li, Fatima Mumtaz, Xuan Li, Maryam R. Al Shehhi, Kean Wang
Summary: A highly flexible and crosslinked chitosan film embedded with g-C3N4@Ag (CN@Ag) nanosheets and AgCl nanoparticles was prepared as an efficient adsorbent for removing iodide ions (I-) in nuclear wastewater. The adsorption performance of the composite film for 127I anions (to mimic radioactive iodine) was investigated in detail. The adsorbent showed high I-removal efficiency over a wide range of pH, and the adsorption capacity was more than doubled compared to the crosslinked pristine chitosan film. The adsorption mechanism involved physisorption, chemisorption, and chemical reaction.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Chen Zhang, Chenyang Zhou, Yuan Li, Yunsong Yu, Jingfeng Zhang, Zaoxiao Zhang, Geoff Wang
Summary: New solvents are being explored as effective methods for enhancing reaction rates and reducing reaction energy barriers. The traditional approach for developing new solvents has reached a dead end, leading to the design of a breakthrough technique involving single atom solutions. Experiments have demonstrated the presence of single atoms in the solutions and their charge-producing effects, while a density functional theory model has been used to analyze microscale characteristics. This method has been applied to carbon dioxide capture, resulting in intensified CO2 desorption rates in the single atom solution system by controlling the reaction energy barrier. The results indicate that single atom solutions can generate a maximum voltage of 2.12 V and effectively utilize substantial waste heat below 373 K, contributing to near zero energy consumption.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Engineering, Chemical
Fahmi Anwar, K. Suresh Kumar Reddy, Anish Mathai Varghese, Maryam Khaleel, Kean Wang, Georgios N. Karanikolos
Summary: Paraffin-selective adsorbents for ethane/ethylene separation were developed using surface-functionalized mesoporous silica adsorbents. The adsorbents exhibited reverse selectivity, becoming paraffin-selective due to enhanced van der Waal's interactions between the grafted ionic liquids and ethane. Various silica-based adsorbents functionalized with different loadings, anion, and cation types were synthesized and characterized. The adsorbents showed stable performance in pressure swing adsorption and breakthrough cyclic testing, with a breakthrough ethylene productivity of up to 1.2 mmol/g and a breakthrough selectivity of 2.4.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Polymer Science
Chenfeng Ku, Youhong Zhang, Guohong Zhou, Kean Wang
Summary: Molecularly imprinted polymers (MIPs) were synthesized via precipitation polymerization for selective adsorption of morphine. The MIP with optimal performance was obtained by adjusting synthesis conditions. It showed high adsorption capacity, reusability, and stability in acetonitrile solution.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
