Article
Multidisciplinary Sciences
Jianmin Liu, Hengxing Ren, Yi Jin, Huan He, Linyong Chen, Guofu Li, Baoyu Wang
Summary: This study investigated the biogas generation characteristics of the organic matter in lignite through methanol extraction. The results showed that methanogenic microorganisms could utilize the extract to produce H2 and CO2 without accumulating CH4. The methane production of the residue was higher than that of raw lignite, and the extracted organic compounds were degraded and their molecular weight was reduced.
Article
Construction & Building Technology
Zhiliu Wang, Bo Liu, Yanhui Han, Zhaoyang Li, Yingjie Cao, Fuzhou Qi
Summary: By analyzing the fracture zone and conducting modeling experiments, the layout parameters for the gas drainage roadway (GDR) were determined. The recommended optimal height and horizontal distance can effectively improve the gas drainage effect in mining operations.
ADVANCES IN CIVIL ENGINEERING
(2021)
Article
Energy & Fuels
Lin Jiang, Yan Song, Wen Zhao, Dongmei Bo, Shaobo Liu, Jiaqing Hao
Summary: This study aims to elucidate the CBM enrichment mechanism in the southern Qinshui Basin, China, and provides new insights into CBM enrichment patterns. The findings reveal a high-yield model of CBM accumulation and the primary challenges for CBM development in China. This study represents a valuable contribution toward unlocking China's CBM potential through improved geological characterization.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2023)
Article
Energy & Fuels
Yuejian Lu, Dameng Liu, Yidong Cai, Changjing Gao, Qifeng Jia, Yingfang Zhou
Summary: This study investigates the wettability of 17 different rank coals and finds a negative correlation between wettability and coal surface roughness and adhesive force. Line tension has the most significant impact on droplets smaller than 10 nanometers, while it can be neglected in the wetting process in micropores and mesopores.
Article
Chemistry, Multidisciplinary
Baoxin Zhang, Ze Deng, Xuehai Fu, Ke Yin
Summary: The study explored the distribution characteristics of coalbed methane and water in the Fukang mining area of Xinjiang, China. It found that the average daily water production and average daily gas production of CBM wells show a negative correlation, with high gas-producing wells mainly located in high areas of the structure.
Article
Energy & Fuels
Bo Wang, Yanting Wu, Guofu Li, Jiaosheng Yang, Yang Zhao, Meizhu Wang, Jian Zhou, Tong Wu, Zhejun Pan
Summary: The study revealed that mineral fillings in coal beds have a significant impact on the permeability and production of coalbed methane (CBM) in China, especially in the fracture system. The influence of mineral fillings on permeability and fracture compressibility is complex, and the strong swelling strain anisotropy and low Poisson's ratio associated with mineral fillings are also noteworthy.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Environmental
Chao Li, Yong Qin, Tao Guo, Jian Shen, Yi Yang
Summary: This study measured the high-pressure adsorption isotherms of two coal samples to investigate the methane adsorption process and mechanisms in coal. The results showed that micropore filling and surface adsorption are the primary adsorption mechanisms for supercritical methane in coal, with micropore filling occurring in pores smaller than 1.1 nm and surface adsorption occurring in 1-2 nm pores. Micropore filling adsorption plays a significant role in the overall methane adsorption, and the nano-confined effect and low water saturation contribute to the enrichment of free gas in deep coalbed methane (CBM). These findings provide insights into the occurrence behavior of unconventional natural gas in reservoirs.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Shuang Ju, Qiming Huang, Gang Wang, Jian Qiao, Shibin Wang, Cunli Qin
Summary: This study investigated the synergistic stabilization mechanism of SiO2 nanoparticles and SDS during foam fracturing. The results showed that an appropriate concentration of SDS can enhance the adsorption of SiO2 nanoparticles at the gas-liquid interface, thereby improving foam stability.
Review
Energy & Fuels
Chao Xu, Tong Yang, Kai Wang, Qiang Fu, Shihao Ma
Summary: Coalbed methane is a low-carbon and clean energy source, but also a dangerous gas that threatens mine safety. Understanding the development of fractures and gas migration in the coal seam's overlying strata is essential for accurate extraction. Various methods, such as roadway, borehole drilling, and surface drilling, are used for gas extraction in the fractured zone.
Review
Microbiology
Run Chen, Yunxia Bao, Yajun Zhang
Summary: Biogenic coalbed methane (CBM) is a significant alternative energy source for achieving carbon neutrality. This review summarizes the recent progress in detection technologies and experimental research on biogenic CBM in China. Factors influencing biogenic CBM generation and identification methods are analyzed. Detection technologies for biogas and research methods for microbial diversity are summarized. The review highlights the conditions favoring biogenic CBM production and the three aspects to identify biogenic CBM. The dominant bacterial phyla and archaeal fractions in various basins in China are determined. The review aims to promote the development of coal biotransformation and CO2 bio-utilization to meet energy demands under carbon neutrality.
Article
Thermodynamics
Chenghong Wang, Daming Sun, Qie Shen, Keyi Shen, Jianshe Linghu, Xiaodong Wang
Summary: Four typical nitrogen reverse Brayton cycles (N-2-RBCs) were studied to reveal the efficiency difference in recovering coalbed methane (CBM). The N-2-RBC with parallel arrangement of expanders showed better matching between hot and cold composite curves. The liquefaction process using parallel N2-RBC achieved the lowest specific power consumption (SPC) of 0.72 kWh center dot kg(-1) and the highest figure of merit of 31.11%, with the lowest exergy loss of 180.1 kW and a total investment of 4047.76 k$ for a liquefaction capacity of 10 tons per day.
Article
Energy & Fuels
Yuanlong Wei, Lingyun Zhao, Wei Liu, Xiong Zhang, Zhijun Guo, Zhangli Wu, Shenghui Yuan
Summary: In this paper, the reservoir parameters of coalbed methane (CBM) in a working area in Western Guizhou Province, China were predicted using 3D seismic exploration technology, and the sweet-spot area was evaluated based on the prediction results. New technologies and methods suitable for CBM were explored, and a quantitative prediction technology of CBM sweet spots was developed. A multi-parameter weighted step-by-step evaluation method based on inversion was proposed for comprehensive evaluation of sweet spots. The C409 coal seam was selected as the sweet spot based on this method.
Article
Energy & Fuels
Zhihang Li, Xiong Hu
Summary: This paper proposes a method of measuring the gas diffusion coefficient of coal and rock by using the experimental method and establishes a calculation model for calculating the gas diffusion coefficient of coal and rock. The results show that it is feasible to calculate the diffusion coefficient of the gas in coal and rock according to the adsorption capacity of coal and rock. The diffusion coefficient increases with the increase in pressure, decreases with the increase in water saturation, and increases with the increase in temperature.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Kang Yang, Wei Li, Lin Gao, Haifeng Wang, Jinzhao Liu, Jia Lin
Summary: A model of coalbed methane enrichment and extraction in abandoned mine gobs was established to study the migration law and seepage characteristics of CBM. It was found that during mine closure, CBM pressure gradually recovers and is positively correlated with the matrix pressure and diffusion coefficient of coal seam. Residual coal in the gob is the dominant source of CBM seepage during extraction, and the layout of surface wells, negative extraction pressure, and extraction time can affect CBM production and recovery.
NATURAL RESOURCES RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Wenlong Han, Yong Li, Yanbin Wang, Xiaoming Ni, Li Wang, Yuefu Zhou
Summary: Coal fines samples from CBM wells in the Shizhuang block, Qinshui Basin, China were characterized using various methods, and the factors controlling coal fines production were discussed. The study found that the produced coal fines had higher mineral content than the primary samples, and the organic composition was dominated by vitrinite followed by inertinite and inorganic minerals. The coal fines were mainly composed of clay minerals, pyrite, and quartz, with a wide range of particle sizes. During CBM drainage, the average mass concentration of the coal fines first increased and then decreased, and it was positively correlated with the initial reservoir pressure gradient.
NATURAL RESOURCES RESEARCH
(2023)
Article
Economics
Marie-Louise Arlt, David Chassin, Claudio Rivetta, James Sweeney
Summary: This paper examines the impact of real-time pricing and load automation on residential distribution systems. The study finds that implementing real-time pricing can result in an aggregate welfare gain of 39 USD per customer and year. However, it also notes that RTP and load automation may significantly increase peak system load. Introducing a market-based demand management system can further enhance welfare gains and reduce grid investment.
Article
Economics
Javier Jorquera-Copier, Alvaro Lorca, Enzo Sauma, Stefan Lorenczik, Matias Negrete-Pincetic
Summary: As countries update their climate ambitions, low-carbon hydrogen production and use present opportunities for emissions reductions and economic development. A case study for Chile shows that integrating hydrogen and electricity networks can lower system costs and enhance renewable integration, but policy support is needed to address concerns related to water and land use.
Article
Economics
Dawit Guta, Hisham Zerriffi, Jill Baumgartner, Abhishek Jain, Sunil Mani, Darby Jack, Ellison Carter, Guofeng Shen, Jennifer Orgill-Meyer, Joshua Rosenthal, Katherine Dickinson, Rob Bailis, Yuta Masuda
Summary: Household solid fuel use is detrimental to health and the environment. The Indian government's PMUY subsidy has successfully promoted the adoption of LPG by millions of households. However, there is limited understanding of the decision-making process to reduce solid fuel use after transitioning to cleaner fuels. This study found that factors such as household wealth, social status, education level, and the prevalence of LPG use in the village are positively associated with LPG consumption and the discontinuation of solid fuel use. On the other hand, factors such as distance to LPG refill delivery, household size, and the PMUY subsidy are negatively associated with the share of LPG use.
Article
Economics
Nicolas Morell-Dameto, Jose Pablo Chaves-Avila, Tomas Gomez San Roman, Pablo Duenas-Martinez, Tim Schittekatte
Summary: This paper assesses the performance of differently implemented forward-looking network tariff designs and proposes an innovative coordination mechanism to increase predictability in a future with many flexible customers. The study reveals that if large shares of customers synchronize their responses to highly time-varying and locational-specific network charges, it can lead to unexpected reinforcements.
Article
Economics
Alexandra Gritz, Guntram Wolff
Summary: Russia's weaponization of gas supplies shook the energy security of Central and Eastern Europe in 2022. The region responded by increasing alternative energy supplies and developing new gas supply routes. Renewable energy, nuclear energy, and hydrogen play important roles in the long-term. Mitigating the impact of this shock requires the EU to prioritize the integrity of its energy market.
Article
Economics
Jaroslaw Kantorowicz, Marion Collewet, Matthew DiGiuseppe, Hendrik Vrijburg
Summary: Economic costs are a major political obstacle to investing in climate change mitigation and adaptation measures. The method of financing plays a crucial role in determining public opposition to government green investments, with debt financing being less opposed than broad-based taxes. This study suggests that credit market tools, such as green bonds and debt for climate swaps, can be politically efficient in increasing support for green financing. Carbon taxes and wealth taxes are found to be the most preferred options.
Article
Economics
Kun Guo, Liyuan Luan, Xiaoli Cai, Dayong Zhang, Qiang Ji
Summary: This paper investigates China's energy trade stability using a survival analysis approach. It finds that the energy trade linkages between China and 153 other countries are complex and unstable, with short periods of trade with many countries. Geopolitically risky regions, such as the Middle East and Africa, have the lowest trade stability. Climate risks have significant effects on energy trade stability. The paper proposes several policy options to improve energy trade stability in China, with special attention to increasing global climate risks.
Article
Economics
Simona Bigerna, Piyush Choudhary, Nikunj Kumar Jain, Silvia Micheli, Paolo Polinori
Summary: This study estimates the willingness to pay of Indian urban consumers for a continuous supply of electricity using contingent valuation method. The findings show that the amount consumers are willing to pay depends on the duration of power outages, with households preferring shorter outages. Income and environmental attitude also positively influence higher willingness to pay. These insights can inform policymakers in designing more reliable and customer-centric energy generation and distribution models.
Article
Economics
Temilade Sesan, Unico Uduka, Lucy Baker, Okechukwu Ugwu, Ewah Eleri, Subhes Bhattacharyya
Summary: This study examines the impact of the regulatory framework on rural electrification and universal energy access goals in Nigeria's mini-grid sector. The findings suggest that while the current framework has fostered sector growth, additional measures are necessary to ensure equitable distribution of access among rural populations.
Article
Economics
Rui Shan, Noah Kittner
Summary: Energy storage is a cornerstone in decarbonization planning as it reduces operational costs and greenhouse gas emissions, while enhancing resilience and renewables integration. However, storage developers in different regions have varying economic and environmental considerations, thereby requiring policy intervention to achieve long-term emission reductions.
Article
Economics
Tung Durmaz, Sevil Acar, Simay Kizilkaya
Summary: This study investigates the phenomenon of strategic capacity withholding in the Turkish electricity market and its relationship with the capacity remuneration mechanism. The empirical results provide strong evidence of strategic capacity withholding and show that the capacity mechanism contributes to the duration of failures. The study offers important insights for policymakers, including the implementation of a random verification mechanism and restructuring of the capacity mechanism in Turkey.
Article
Economics
Tii N. Nchofoung
Summary: The study finds that oil price shocks have a negative impact on Africa's energy transition, particularly in rural areas and net crude oil exporting countries. However, oil price shocks cannot explain the urban-rural differences in clean energy access. Therefore, increasing investment in clean energy and technologies in rural areas is necessary to enhance the resilience of the energy sector to oil price shocks.
Article
Economics
Najia Saqib, Muhammad Usman, Ilhan Ozturk, Arshian Sharif
Summary: This study examines the impact of environmental technologies, financial growth, and energy use on ecological footprint and green growth. Environmental innovation and renewable energy deployment contribute to green growth, while financial expansion and non-renewable energy use have negative effects on the environment. The study also identifies causal relationships between different factors.
Article
Economics
Yessica C. Y. Chung, Noxolo Kunene, Hung-Hao Chang
Summary: The Renewable Energy Certificate (REC) is considered an innovative technology for building a green society. This study investigates the impact of REC purchases on stock return and volume in Taiwan between 2017 and 2021. The findings suggest that REC purchases have a positive effect on stock returns of manufacturing firms but not service firms. The frequency of REC purchases is also an important factor in the relationship between REC purchase and firm value. Additionally, the study reveals that public attention to environmental pollution plays a crucial role in positive stock returns and volume, while ESG disclosure is negatively associated with returns and volume.
Article
Economics
Seife Ayele, Wei Shen, Yacob Mulugetta, Tadesse Kuma Worako
Summary: This paper addresses the challenges of governing energy procurement from a mix of non-hydropower renewable energy sources supplied by independent producers. Building on political economy analysis and five case studies of independent producer projects from Ethiopia, it seeks to understand the root causes of the protracted delays and limited extent of procurement by independent producers. The key contestations lie in managing long term contracts, risk, uncertainty and in developing the institutional and human capacity to transition.