U.S. flag

An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

PubAg

Main content area

You searched for: Subject "combustion" Remove constraint Subject: "combustion"
Start Over

Search

23,838  Search Results

« Previous | 1 - 20 of 23,838 |
Number of results to display per page

Search Results

1. Discrimination method of biomass slagging tendency based on particle swarm optimization deep neural network (DNN)

Author:
Yingxin Bi; Chunxiang Chen; Xiaodong Huang; Haokun Wang; Guangsheng Wei
Source:
Energy 2023 v.262 pp. 125368
ISSN:
0360-5442
Subject:
combustion; combustion efficiency,   etc   ; algorithms; ash content; biofuels; biomass; data collection; energy; neural networks;     Show all 9 Subjects
Abstract:
... The slagging problem that occurs during the combustion of biomass fuels is difficult to deal with, affecting the safe operation of the boiler and reducing the combustion efficiency. Predicting the slagging tendency of biomass combustion can guide the selection of fuel, reduce the experimental cost and improve the production efficiency of the boiler. In this paper, 114 kinds of biomass are selected ...
DOI:
10.1016/j.energy.2022.125368

2. Numerical study on the asymmetrical jets formation from active pre-chamber under super-lean combustion conditions

Author:
Deyang Zhao; Yanzhao An; Yiqiang Pei; Hao Shi; Kun Wang
Source:
Energy 2023 v.262 pp. 125446
ISSN:
0360-5442
Subject:
combustion,   etc   ; air; air flow; asymmetry; energy; fuels;     Show all 6 Subjects
Abstract:
... This paper aims to investigate the mechanism of the asymmetric jets of the TJI system. We analyzed the effects of fuel injection and air flows in pre-chamber and main chamber, initial flame kernel, and evolution of turbulent hot jets. The evaluation indexes of asymmetric jet were proposed. The results show when adding fuel injection into the homogeneous PC with off-central spark plug, the average ...
DOI:
10.1016/j.energy.2022.125446

3. Experimental investigation of the two-stage ignition delay and flame structure of pentanol/n-dodecane binary fuel

Author:
Feibin Yan; Wenjun Zhong; Qilong Xiang; Tamilselvan Pachiannan; Wenjun Wang; Zhixia He; Qian Wang
Source:
Energy 2023 v.262 pp. 125546
ISSN:
0360-5442
Subject:
combustion,   etc   ; chemiluminescence; energy; fluorescence; formaldehyde; fuels; mathematical models; pentanols;     Show all 8 Subjects
Abstract:
... High thermal efficiency and low emissions are achievable with pentanol direct injection compression ignition, but there are issues of difficulty and unstable combustion at low loads. To solve the above problem, a binary fuel is obtained by blending high-activity n-dodecane with pentanol. In a constant-volume combustion chamber, the natural flame luminosity, schlieren, formaldehyde planar laser-ind ...
DOI:
10.1016/j.energy.2022.125546

4. Experimental study on the flame height evolution of two adjacent hydrocarbon pool fires under transverse air flow

Author:
Congling Shi; Lei Deng; Fei Ren; Fei Tang
Source:
Energy 2023 v.262 pp. 125520
ISSN:
0360-5442
Subject:
combustion,   etc   ; air; air flow; energy; ethanol; evolution; fuels; heptane;     Show all 8 Subjects
Abstract:
... Hydrocarbon energy storage has a wide range of applications in modern production and life. Regarded as an important form of energy dissipation, combustion plays an important role in energy storage failure. The possible ignition of adjacent leaked fuel might induce multiple fires burning simultaneous. The present work experimentally characterizes the flame evolution of two adjacent pool fires with ...
DOI:
10.1016/j.energy.2022.125520

5. Intrinsic combustion kinetics of rapid-pyrolysis Zhundong coal char

Author:
Yang Liu; Peifang Fu; Bo Yu; Weijie Yan; Yumin Chen; Huaichun Zhou
Source:
Energy 2023 v.262 pp. 125548
ISSN:
0360-5442
Subject:
combustion,   etc   ; activation energy; coal; energy; prediction; slags; surface area; thermogravimetry;     Show all 8 Subjects
Abstract:
... Driven by the demand for accurate intrinsic kinetics for the prediction of the combustion rate of purely fired Zhundong coal (ZDC) in a slag tapping boiler, the surface activation function (SAF) and intrinsic kinetic parameters of two types of rapid-pyrolysis ZDC chars were revealed via the isothermal and nonisothermal thermogravimetric analysis methods. The isothermal kinetic results show that th ...
DOI:
10.1016/j.energy.2022.125548

6. Energy analysis and optimization of iso-octane and n-heptane combustion process

Author:
Jianan Wei; Haifeng Liu; Hongyan Zhu; Yuqing Cai; Hu Wang; Mingfa Yao
Source:
Energy 2023 v.262 pp. 125561
ISSN:
0360-5442
Subject:
combustion,   etc   ; cost effectiveness; exergy; fuels; heat; heptane; iso-octanes; temperature;     Show all 8 Subjects
Abstract:
... The energy analysis and optimization were conducted under different boundary conditions for iso-octane and n-heptane constant volume self-ignition process from the view of energy (HR: Heat Release) and exergy (EL: Exergy Loss) of chemical reactions, which were classified into five series: LTO (Low Temperature Oxidation), H₂O₂ Loop, Fuel Fragment，H–O and CO–CO₂. The results indicate that the HRR (H ...
DOI:
10.1016/j.energy.2022.125561

7. Enhancement of toluene oxidation performance over La1-xCoO3-δ perovskite by lanthanum non-stoichiometry

Author:
Anlian Zhao; Yewei Ren; Hui Wang; Zhenping Qu
Source:
Journal of environmental sciences (China) 2023 v.127 pp. 811-823
ISSN:
1001-0742
Subject:
combustion,   etc   ; catalysts; catalytic activity; lanthanum; oxygen; sol-gel processing; toluene; China;     Show all 8 Subjects
Abstract:
... La₁₋ₓCoO₃₋δ catalysts with different non-stoichiometry of lanthanum ions were synthesized by using the sol-gel method, and their catalytic performance in toluene combustion was investigated. The results showed that the catalytic activity and stability of A-site nonstoichiometric La₁₋ₓCoO₃₋δ were improved to a certain extent compared with pure LaCoO₃ perovskite. Among them, the La₀.₉CoO₃₋δ catalyst ...
DOI:
10.1016/j.jes.2022.06.042

8. Ethylene combustion performance with varying the N2 content in a porous burner

Author:
Zhongqian Ling; Ling Lu; Xianyang Zeng; Min Kuang; Bo Ling; Chuanji Gao; Chao Zhou
Source:
Energy 2023 v.262 pp. 125321
ISSN:
0360-5442
Subject:
combustion,   etc   ; aluminum oxide; energy; ethylene; pollutants; porous media; temperature; volatile organic compounds;     Show all 8 Subjects
Abstract:
... Direct emissions of volatile organic compounds (VOCs) not only pollute the environment, but also waste a lot of resources. To overcome above problem, this paper creatively proposed the solution by porous media combustion technology. In this study, ethylene with different N₂ content levels of 10%, 30%, and 50% (used to simulate VOCs) was experimentally burned in a self-designed porous medium burner ...
DOI:
10.1016/j.energy.2022.125321

9. Experimental and numerical simulation of multi-component combustion of typical no-charring material

Author:
Yanming Ding; Gonghua Jiang; Kazui Fukumoto; Mengqi Zhao; Xueting Zhang; Changjian Wang; Changhai Li
Source:
Energy 2023 v.262 pp. 125555
ISSN:
0360-5442
Subject:
combustion,   etc   ; Fourier transform infrared spectroscopy; calorimeters; energy; mathematical models; prediction; pyrolysis; thermogravimetry;     Show all 8 Subjects
Abstract:
... To predict the direct combustion of no-charring material, multiple pyrolysis gas components, which are closer to the real produced pyrolysis gases, are involved in the numerical simulation. The pyrolysis gas components are obtained by thermogravimetry coupled with fourier transform infrared spectroscopy experiments, and then several main components are chosen to be directly imported into the follo ...
DOI:
10.1016/j.energy.2022.125555

10. Thermal properties and microstructural evolution of coal spontaneous combustion

Author:
Rongkun Pan; Cong Li; Jiangkun Chao; Daimin Hu; Hailin Jia
Source:
Energy 2023 v.262 pp. 125400
ISSN:
0360-5442
Subject:
combustion,   etc   ; X-ray diffraction; calorimeters; coal; energy; heat production; microstructure; temperature; China;     Show all 9 Subjects
Abstract:
... With the increase of coal energy mining depth in China, coal spontaneous combustion phenomenon becomes more frequent, which makes the safe mining of coal energy in China under serious threat. In order to prevent coal spontaneous combustion, it is significant to investigate the process of coal oxidation and spontaneous combustion by combining thermal and microstructural properties, which is a neces ...
DOI:
10.1016/j.energy.2022.125400

11. The synergistic effect during co-combustion of municipal sludge and coal: Experimental and ReaxFF molecular dynamic study

Author:
Tong Xu; Chunbo Wang; Dikun Hong; Song Li; Shuang Yue
Source:
Energy 2023 v.262 pp. 125553
ISSN:
0360-5442
Subject:
combustion,   etc   ; aromatic compounds; carbon dioxide; coal; energy; intermediate product; sludge; synergism; thermogravimetry;     Show all 9 Subjects
Abstract:
... In this work, the behaviors of municipal sludge/coal co-combustion were investigated by experiments and ReaxFF molecular dynamic simulations. The molecular models of coal and sludge were constructed based on experimental characterization. The characteristics of the separately combustion of sludge and coal from ReaxFF MD simulations were consistent with that from thermostatic thermogravimetric expe ...
DOI:
10.1016/j.energy.2022.125553

12. Source oxygen contributions of primary nitrate emitted from biomass burning

Author:
Wei Song; Xue-Yan Liu
Source:
Science of the total environment 2023 v.854 pp. 158736
ISSN:
0048-9697
Subject:
combustion,   etc   ; biomass; carbon; environment; nitrates; oxygen; oxygen isotopes; photochemistry; pollution; vapors; China;     Show all 11 Subjects
Abstract:
... Atmospheric nitrate (NO₃⁻) produced by photochemical oxidation in the atmosphere has high oxygen isotope ratios (δ¹⁸O values). Recently, the primary NO₃⁻ emitted from combustion sources was found to have much lower δ¹⁸O values. However, it is unclear how and to what extents the low δ¹⁸O signatures were controlled by major O sources during the primary NO₃⁻ formation of combustion processes. Here, w ...
DOI:
10.1016/j.scitotenv.2022.158736

13. Field assessment of straw pellet combustion in improved heating stoves in rural Northeast China

Author:
Yafei Liu; Zhimin Li; Emily Floess; You Zhang; Nicholas Lam; Sylvester K. Mawusi; Prabin Shrestha; Xinghua Li; Chunyu Xue; Guangqing Liu
Source:
Journal of environmental sciences (China) 2023 v.127 pp. 295-307
ISSN:
1001-0742
Subject:
combustion,   etc   ; alternative fuels; biomass; coal; corn; heating systems; pollutants; straw; variance; villages; China;     Show all 11 Subjects
Abstract:
... Straw pellets are widely promoted and expected to be a cleaner alternative fuel to unprocessed crop residues and raw coal in rural China. However, the effectiveness of these dissemination programs is not well evaluated. In this field study, emission characteristics of burning straw pellets, raw coal, and unprocessed corn cobs in heating stoves were investigated in a pilot village in Northeast Chin ...
DOI:
10.1016/j.jes.2022.05.046

14. Numerical study of ignition process in vortex cold wall combustion chamber

Author:
Kaifang Guo; Dechuan Sun; Zhuoxiong Zeng
Source:
Energy 2023 v.262 pp. 125443
ISSN:
0360-5442
Subject:
combustion,   etc   ; asymmetry; cold; energy; energy density; heat production; hydrogen; mathematical models; probability; temperature;     Show all 10 Subjects
Abstract:
... Numerical simulation in a hydrogen-oxygen vortex cold-wall combustion chamber is carried out to analyze the effects of energy density, spark duration, and spark position on the ignition process. The results show that energy density not only determines whether ignition is successful or not but also affects ignition delay time. For the same spark energy, spark duration is key to the success of ignit ...
DOI:
10.1016/j.energy.2022.125443

15. Seasonal variation and sources of atmospheric polycyclic aromatic hydrocarbons in a background site on the Tibetan Plateau

Author:
Xuemei Wu; Weijun Sun; Baojuan Huai; Lei Wang; Chuntan Han; Yetang Wang; Wenying Mi
Source:
Journal of environmental sciences (China) 2023 v.125 pp. 524-532
ISSN:
1001-0742
Subject:
combustion,   etc   ; air; atmospheric circulation; biomass; coal; models; molecular weight; seasonal variation; summer; China;     Show all 10 Subjects
Abstract:
... The study of atmospheric polycyclic aromatic hydrocarbons (PAHs) in northeastern Tibetan Plateau with fragile ecological environment and complex atmospheric circulation system is blank. To understand the characteristics and sources of persistent organic pollutants in the atmosphere of the northeastern Tibetan Plateau, we monitored levels in the central Qilian Mountain. From 2016 to 2017, we collec ...
DOI:
10.1016/j.jes.2022.02.042

16. Alkali/alkaline-earth metal-modified MnOx supported on three-dimensionally ordered macroporous–mesoporous TixSi1-xO2 catalysts: Preparation and catalytic performance for soot combustion

Author:
Chao Peng; Di Yu; Chunlei Zhang; Maozhong Chen; Lanyi Wang; Xuehua Yu; Xiaoqiang Fan; Zhen Zhao; Kai Cheng; Yongsheng Chen; Yuechang Wei; Jian Liu
Source:
Journal of environmental sciences (China) 2023 v.125 pp. 82-94
ISSN:
1001-0742
Subject:
combustion,   etc   ; Raman spectroscopy; X-ray diffraction; catalytic activity; desorption; macropores; porous media; soot; China;     Show all 9 Subjects
Abstract:
... The performance of catalysts used in after-treatment systems is the key factor for the removal of diesel soot, which is an important component of atmospheric fine particle emissions. Herein, three-dimensionally ordered macroporous–mesoporous TiₓSi₁₋ₓO₂ (3DOM-m TiₓSi₁₋ₓO₂) and its supported MnOₓ catalysts doped with different alkali/alkaline-earth metals (AMnOₓ/3DOM-m Ti₀.₇Si₀.₃O₂ (A: Li, Na, K, Ru ...
DOI:
10.1016/j.jes.2021.10.029

17. Real-world characterization of carbonaceous substances from industrial stationary and process source emissions

Author:
Min Cui; Yuanyuan Xu; Fan Zhang; Caiqing Yan; Jun Li; Mei Zheng; Yingjun Chen
Source:
Science of the total environment 2023 v.854 pp. 158505
ISSN:
0048-9697
Subject:
combustion,   etc   ; air quality; alkanes; climate change; coal; dust; environment; human health; organic carbon; particulates; uncertainty;     Show all 11 Subjects
Abstract:
... Carbonaceous substances in industrial emissions are harmful to human health, air quality, and climate change. Owing to the existence of various fuel types and different technological processes, the characterization of carbonaceous substances from industrial emissions varies significantly, which causes a large uncertainty in source apportionment. Therefore, nine typical industrial sources were sele ...
DOI:
10.1016/j.scitotenv.2022.158505

18. A new method of hotspot analysis on the management of CO2 and air pollutants, a case study in Guangzhou city, China

Author:
Li Zhang; Muchuan Niu; Zhe Zhang; Jizhang Huang; Lingyun Pang; Pengcheng Wu; Cheng Lv; Sen Liang; Mengbing Du; Mingyu Li; Libin Cao; Yu Lei; Bofeng Cai; Yifang Zhu
Source:
Science of the total environment 2023 v.856 pp. 159040
ISSN:
0048-9697
Subject:
combustion,   etc   ; air; carbon dioxide; case studies; environment; inventories; resource allocation; spatial data; transportation industry; China;     Show all 10 Subjects
Abstract:
... Emission inventory plays an important role in designing effective emission control strategies. Currently, there is unbalanced development of CO₂ and air pollutant emission inventories in China and the spatial information of both cannot be obtained simultaneously, which prevents a collaborative control strategy. In this study, we developed a unified emission inventory including both CO₂ and air pol ...
DOI:
10.1016/j.scitotenv.2022.159040

19. Applicability of alfalfa and goldenrod residues after supercritical CO2 extraction to plant micronutrient biosorption and renewable energy production

Author:
Mateusz Samoraj; Agnieszka Dmytryk; Łukasz Tuhy; Anna Zdunek; Piotr Rusek; Konstantinos Moustakas; Katarzyna Chojnacka
Source:
Energy 2023 v.262 pp. 125437
ISSN:
0360-5442
Subject:
combustion,   etc   ; alfalfa; biofuels; biosorption; carbon dioxide; energy; heat production; nitrogen; supercritical fluid extraction; weight loss;     Show all 10 Subjects
Abstract:
... The residues of alfalfa and goldenrod, after supercritical CO₂ extraction, were examined against raw plant materials to determine the capacity to carry micronutrients and energy production. Materials were enriched with Cu(II), Mn(II) and Zn(II), via biosorption and subjected to multielemental analysis and determination of nitrogen. The materials showed a high capacity for Cu(II)>Zn(II) > Mn(II), w ...
DOI:
10.1016/j.energy.2022.125437

20. Thermodynamic variation law and influence mechanism of low-temperature oxidation of lignite samples with different moisture contents

Author:
Min Li; Xueqin Yang; Yi Lu; Deming Wang; Shiliang Shi; Qing Ye; He Li; Zheng Wang
Source:
Energy 2023 v.262 pp. 125605
ISSN:
0360-5442
Subject:
combustion,   etc   ; absorption; activation energy; adsorption; energy; heat production; lignite; oxygen; temperature; water content; weight gain;     Show all 11 Subjects
Abstract:
... Coal spontaneous combustion (CSC) is one of the main disasters that threaten the safe production in coal mines. Moisture, which is the main factor affecting coal oxidation, has a considerable impact on CSC. In this paper, the variation characteristics of TG-DTG and DSC-DDSC curves of two kinds of lignite during low-temperature oxidation were investigated. The following results were obtained: Oxida ...
DOI:
10.1016/j.energy.2022.125605