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1. Efficient screening of novel adsorbents for coalbed methane recovery

Author:
Xu, Mai; Deng, Shuguang
Source:
Journal of colloid and interface science 2020 v.565 pp. 131-141
ISSN:
0021-9797
Subject:
coalbed methane; methane; methane production,   etc   ; adsorbents; adsorption; energy; screening;     Show all 7 Subjects
Abstract:
... Many adsorbents with outstanding methane (CH₄)/nitrogen (N₂) separation performance are reported recently. Some may have the potential for coalbed methane (CBM) recovery to resolve the current energy crisis. However, no systematic assessment method for evaluating these adsorbents is available. This study was performed for efficient comparison and assessment of 47 novel adsorbents that are suitable ...
DOI:
10.1016/j.jcis.2020.01.008

2. On the mechanisms of flame propagation in methane-air mixtures with concentration gradient

Author:
Sun, Xuxu; Lu, Shouxiang
Source:
Energy 2020 v.202 pp. 117782
ISSN:
0360-5442
Subject:
methane,   etc   ; Tulipa; cameras;     Show all 3 Subjects
Abstract:
... In this study, the tulip flame in methane-air mixtures with concentration gradient are investigated experimentally in a square tube with 3-m long and 30 × 30 cm cross section. The concentration gradient is produced by installing 54 (27 × 2) evenly spaced intake gas device on the top wall. Six pressure transducers are used to record the pressure evolution and the high-speed camera is adopted to obt ...
DOI:
10.1016/j.energy.2020.117782

3. Experimental study on the explosion-propagation law of coal dust with different moisture contents induced by methane explosion

Author:
Niu, Yihui; Zhang, Leilin; Shi, Biming
Source:
Powder technology 2020 v.361 pp. 507-511
ISSN:
0032-5910
Subject:
methane,   etc   ; coal; dust; water content;     Show all 4 Subjects
Abstract:
... This study aimed to explore the explosion-propagation law of coal dust with different moisture contents induced by methane explosion. An experimental system of explosion of mixed gas–coal and dust in a straight pipe was established in our laboratory. The evolution of overpressure and the flame-propagation law of deposited-coal-dust explosion with different moisture contents were then studied. Expe ...
DOI:
10.1016/j.powtec.2019.11.089

4. CO₂ Replacing CH₄ Behaviors under Sub- and Supercritical Conditions

Author:
Wang, Jin; Wang, Zhuangsen; Wang, Yanbin; Liu, Zhihan; Li, Yong
Source:
Energy & fuels 2020 v.34 no.4 pp. 4353-4365
ISSN:
1520-5029
Subject:
coalbed methane; methane; methane production,   etc   ; adsorption; carbon dioxide; carbon sequestration; coal; desorption; temperature;     Show all 9 Subjects
Abstract:
... Injecting CO₂ into deep coal seams is key to successful CO₂ sequestration and enhancing coalbed methane production; however, various underground conditions influence the process. In this study, experiments were conducted to determine optimum conditions for replacing CH₄ with CO₂ injection at different temperatures (20, 30, and 40 °C), pressures (2, 3, and 4 MPa), and supercritical conditions (35, ...
DOI:
10.1021/acs.energyfuels.0c00169

5. Synthesis of isolated carbon nanowalls via high-voltage nanosecond pulses in conjunction with CH4/H2 plasma enhanced chemical vapor deposition

Author:
Ichikawa, Tomonori; Shimizu, Naohiro; Ishikawa, Kenji; Hiramatsu, Mineo; Hori, Masaru
Source:
Carbon 2020 v.161 pp. 403-412
ISSN:
0008-6223
Subject:
methane,   etc   ; adsorption; energy; graphene; hydrogen; vapors;     Show all 6 Subjects
Abstract:
... Carbon nanowalls (CNWs) are vertically standing, interconnecting flake- or wall-like collections of graphene sheets. In the present work, this material was synthesized by applying precisely controlled high-voltage nanosecond pulses to a substrate using an inductor energy storage circuit in a radical-injection plasma-enhanced chemical vapor deposition system, employing a CH₄/H₂ plasma. The resultin ...
DOI:
10.1016/j.carbon.2020.01.064

6. Shock tube and kinetic study on ignition characteristics of lean methane/n-heptane mixtures at low and elevated pressures

Author:
Gong, Zhen; Feng, Liyan; Wei, Lai; Qu, Wenjing; Li, Lincheng
Source:
Energy 2020 v.197 pp. 117242
ISSN:
0360-5442
Subject:
methane,   etc   ; control methods; fuels; heptane; oxidation; temperature;     Show all 6 Subjects
Abstract:
... To acquire ignition control methods for dual-fuel marine engine and HCCI engine, ignition characteristics of lean n-heptane/methane mixture under pressure of 2.0 bar and temperature range from 1241 to 1825 K were studied by shock tube and CHEMKIN with LLNL3.1 mechanism. And ignition processes under temperature range from 700 to 1200 K and pressure range from 40 to 140 bar were investigated by CHEM ...
DOI:
10.1016/j.energy.2020.117242

7. Optimization of the Production Pressure for Hydrate Dissociation by Depressurization

Author:
Li, Xiao-Yan; Li, Xiao-Sen; Wang, Yi; Zhang, Yu
Source:
Energy & fuels 2020 v.34 no.4 pp. 4296-4306
ISSN:
1520-5029
Subject:
methane,   etc   ; dissociation; energy; gas hydrate; heat; sediments;     Show all 6 Subjects
Abstract:
... Natural gas hydrate is considered as a promising energy resource in the future. How to choose a suitable production pressure is a key issue when depressurization is taken as the production way of gas hydrate. In this study, we conducted the experiments of methane hydrate dissociation under different production pressures. The influences of production pressure on the hydrate dissociation rate and th ...
DOI:
10.1021/acs.energyfuels.0c00076

8. Evolution characteristics of reservoir parameters during coalbed methane drainage via in-seam horizontal boreholes

Author:
Li, Qixian; Xu, Jiang; Yan, Fazhi; Peng, Shoujian; Zhang, Chaolin; Zhang, Xiaolei
Source:
Powder technology 2020 v.362 pp. 591-603
ISSN:
0032-5910
Subject:
coalbed methane,   etc   ; drainage; gas emissions; permeability; shrinkage;     Show all 5 Subjects
Abstract:
... In-seam horizontal boreholes are used to collect coalbed methane (CBM). Physical simulations of CBM drainage by in-seam horizontal boreholes are conducted. The evolution of gas pressure and permeability ratio indicate a rapid decline in a short time. As time goes by, the permeability ratio recovers, and the gas pressure declines slowly. In the borehole area, initially, the decline rates of the gas ...
DOI:
10.1016/j.powtec.2019.11.104

9. Structures of inverse jet flames stabilized on a coaxial burner

Author:
Kapusta, Łukasz Jan; Shuang, Chen; Aldén, Marcus; Li, Zhongshan
Source:
Energy 2020 v.193 pp. 116757
ISSN:
0360-5442
Subject:
methane,   etc   ; Reynolds number; fluorescence; mass flow;     Show all 4 Subjects
Abstract:
... In this study we investigate different parameters used for mapping global flame structures and identify the most universal in terms of comparing flames emerging from different geometrical burner arrangements. Simultaneously the study was carried out to determine the discharge conditions yielding the blue flame of a high degree of partial premixing, and to examine the instantaneous local flame stru ...
DOI:
10.1016/j.energy.2019.116757

10. Methyl and Hydrogen Transfer in Free Radical Reactions

Author:
Tannous, Joy H.; de Klerk, Arno
Source:
Energy & fuels 2020 v.34 no.2 pp. 1698-1709
ISSN:
1520-5029
Subject:
methane,   etc   ; free radicals; homolytic cleavage; hydrogen; moieties;     Show all 5 Subjects
Abstract:
... It was speculated that hydrogen transfer was not the only type of transfer reaction that could take place during thermal conversion, and that methyl transfer could also take place. There was a large body of literature on intramolecular methyl migration, but little mention of intermolecular methyl transfer as a potentially important reaction type in free radical systems. Methyl transfer during ther ...
DOI:
10.1021/acs.energyfuels.9b04213

11. Effect of copper foam on explosion suppression at different positions in the pipe

Author:
Shao, Hao; Wang, Cheng; Yu, Hongkun
Source:
Powder technology 2020 v.360 pp. 695-703
ISSN:
0032-5910
Subject:
coalbed methane,   etc   ; copper; foams; pipelines; pipes;     Show all 5 Subjects
Abstract:
... Coalbed methane can cause explosion when transported in pipelines. Installing metal foam in the transportation pipeline can suppress coalbed methane explosion. But it is uncertain of the relationship between explosion suppression effect and the distance from the ignition end to the metal foam. Explosion tests were conducted in the empty pipe and in the pipe containing copper foam at 400, 900, and ...
DOI:
10.1016/j.powtec.2019.09.078

12. CO2 removal from synthesized ternary gas mixtures used hydrate formation with sodium dodecyl sulfate(SDS) as additive

Author:
Zang, Xiaoya; Wan, Lihua; He, Yong; Liang, Deqing
Source:
Energy 2020 v.190 pp. 116399
ISSN:
0360-5442
Subject:
methane,   etc   ; biogas; carbon dioxide; sodium dodecyl sulfate;     Show all 4 Subjects
Abstract:
... In order to investigate the hydrate formation kinetics of the ternary gas mixtures containing sodium dodecyl sulfate (SDS) and evaluate the applicability of hydrate based gas separation (HBGS) technology to biogas, synthesized ternary gas mixture (CH4/CO2N2) hydrate formation processes with different concentrations of SDS were investigated comprehensively in this work. The changes in the gas compo ...
DOI:
10.1016/j.energy.2019.116399

13. Investigation on the effect of bluff body ball on the combustion characteristics for methane/oxygen in micro combustor

Author:
Pan, Jianfeng; Zhang, Chenxin; Pan, Zhenhua; Wu, Di; Zhu, Yuejin; Lu, Qingbo; Zhang, Yi
Source:
Energy 2020 v.190 pp. 116465
ISSN:
0360-5442
Subject:
methane,   etc   ; combustion; combustion efficiency; flammability; gases; oxygen;     Show all 6 Subjects
Abstract:
... A micro combustor inserted with a bluff body ball was developed and compared with the conventional combustor. The combustion characteristics (flammability limits, stable flame propagation and combustion efficiency) of methane/oxygen mixture in the micro combustor with bluff body ball were experimentally and numerically investigated. The results show that bluff body ball could broaden flammability ...
DOI:
10.1016/j.energy.2019.116465

14. Vertical Distribution of Methane in Baikal Water

Author:
Mizandrontsev, I. B.; Kozlov, V. V.; Ivanov, V. G.; Kucher, K. M.; Korneva, E. S.; Granin, N. G.
Source:
Water resources 2020 v.47 no.1 pp. 122-129
ISSN:
0097-8078
Subject:
methane,   etc   ; headspace analysis; lakes; methanotrophs; spatial distribution;     Show all 5 Subjects
Abstract:
... Data on the vertical distribution of dissolved methane in Baikal water column are analyzed. The zone of open lake now shows an increase in the concentrations of dissolved methane compared with 2002–2004. The possible causes of this phenomena are considered. Methane concentration in the aerobic water column of Baikal decreases from the surface toward the bottom. The active layer of the lake, as wel ...
DOI:
10.1134/S0097807820010108

15. Energy value estimation of silages for substrate in biogas plants using an artificial neural network

Author:
Kowalczyk-Juśko, Alina; Pochwatka, Patrycja; Zaborowicz, Maciej; Czekała, Wojciech; Mazurkiewicz, Jakub; Mazur, Andrzej; Janczak, Damian; Marczuk, Andrzej; Dach, Jacek
Source:
Energy 2020 v.202 pp. 117729
ISSN:
0360-5442
Subject:
methane; methane production,   etc   ; biogas; databases; energy; fermentation; neural networks; pH; prediction; silage;     Show all 10 Subjects
Abstract:
... The typical tests of biogas efficiency require a great deal of time and are quite expensive. Thus, there is a necessity to develop tools for estimating the energy value of silage more quickly. This paper describes the application of a prediction model based on artificial neural networks to estimate the methane production from various substrates in the form of silages. For this prediction, basic si ...
DOI:
10.1016/j.energy.2020.117729

16. Effect of biogas recirculation strategy on biogas upgrading and process stability of anaerobic digestion of sewage sludge under slightly alkaline condition

Author:
Zhao, Jiamin; Hou, Tingting; Lei, Zhongfang; Shimizu, Kazuya; Zhang, Zhenya
Source:
Bioresource technology 2020 v.308 pp. 123293
ISSN:
0960-8524
Subject:
methane; methane production,   etc   ; alkalinity; ammonia; anaerobic digestion; biogas; fatty acids; hydrogen sulfide; pH; sewage sludge;     Show all 10 Subjects
Abstract:
... In this study, in-situ biogas upgrading was examined and compared in lab-scale semi-continuous anaerobic digestion (AD) systems coupled with biogas recirculation under neutral and slightly alkaline conditions. Results showed that neutral pH (~7.5) condition yielded 6–7% higher CH₄ content and 52–53% less H₂S production, while slightly alkaline condition (pH ~8.0) achieved 14–15% higher CH₄ content ...
DOI:
10.1016/j.biortech.2020.123293

17. Impact of continuous leachate recirculation during solid state anaerobic digestion of Miscanthus

Author:
Li, Chao; Tao, Yu; Fang, Jun; Li, Qiang; Lu, Wenjing
Source:
Renewable energy 2020 v.154 pp. 38-45
ISSN:
0960-1481
Subject:
methane; methane production,   etc   ; Miscanthus; anaerobic digestion; biogas; cellulose; gas production (biological); hemicellulose; leachates; microbial communities;     Show all 10 Subjects
Abstract:
... Continuous leachate recirculation was performed in a solid-state anaerobic digestion (SS-AD) in an attempt to enhance and improve the biogas (methane) production from Miscanthus sp. Furthermore, microbial community dynamics was analysed, and liaised with the process performance and stability. Results showed that the SS-AD process without leachate recirculation showed significantly higher degradati ...
DOI:
10.1016/j.renene.2020.02.104

18. The performance evaluation and kinetics response of advanced anaerobic digestion for sewage sludge under different SRT during semi-continuous operation

Author:
Liu, Jibao; Zheng, Jiaxi; Zhang, Junya; Yu, Dawei; Wei, Yuansong
Source:
Bioresource technology 2020 v.308 pp. 123239
ISSN:
0960-8524
Subject:
methane; methane production,   etc   ; anaerobic digestion; energy; hydrolysis; logit analysis; models; sewage sludge;     Show all 8 Subjects
Abstract:
... Sludge retention time (SRT) is vital for advanced anaerobic digestion (AD) to realize energy self-sufficient. However, the criteria on reasonable SRT has not been fully understood. This study investigated the performance and kinetics response of AD under different SRT in semi-continuous AD with microwave (MW) pretreatment, according to the long-term operation and methane production during one feed ...
DOI:
10.1016/j.biortech.2020.123239

19. Optimization of bioaugmentation of the anaerobic digestion of Axonopus compressus cowgrass for the production of biomethane

Author:
Lee, Jonathan T.E.; Wang, Qingkun; Lim, Ee Yang; Liu, Zhentian; He, Jianzhong; Tong, Yen Wah
Source:
Journal of cleaner production 2020 v.258 pp. 120932
ISSN:
0959-6526
Subject:
methane; methane production,   etc   ; Axonopus compressus; anaerobic digestion; bioaugmentation; biogas; biomass; cellulose; crystal structure; lignocellulose; microorganisms;     Show all 11 Subjects
Abstract:
... Lignocellulosic materials are the largest component of biomass in the world, and therefore suitable substrates for anaerobic digestion (AD). However, they are recalcitrant due to lignin-encrustation and the crystallinity of cellulose. Utilizing the wealth of knowledge in literature, this study compares different bioaugmentation strategies for the AD of Axonopus compressus, common name cowgrass, fr ...
DOI:
10.1016/j.jclepro.2020.120932

20. Evaluation of methane emission flux from a typical biogas fermentation ecosystem in China

Author:
Zeng, Jin; Xu, Rui; Sun, Rong; Niu, Lede; Liu, Ying; Zhou, Ying; Zeng, Weiqing; Yue, Zhiqiang
Source:
Journal of cleaner production 2020 v.257 pp. 120441
ISSN:
0959-6526
Subject:
methane; methane production,   etc   ; biogas; ecosystems; environmental factors; farmers; fermentation; greenhouse gas emissions; sustainable agriculture; temperature; China;     Show all 11 Subjects
Abstract:
... To reduce greenhouse gas emissions and promote sustainable agricultural practices in China, this study used conventional method to examine methane (CH₄) production from hydraulic biogas digesters in Jiuxi Town, Yunnan Province, China. The static chamber technique was utilized to measure CH₄ emission fluxes from the inlet and outlet of the biogas digesters. For the 100 m³ biogas digester, CH₄ emiss ...
DOI:
10.1016/j.jclepro.2020.120441