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Numerical simulation of biodiesel fuel combustion and emission characteristics in a direct injection diesel engine

Yi REN, Ehab ABU-RAMADAN, Xianguo LI,

《能源前沿(英文)》 2010年 第4卷 第2期   页码 252-261 doi: 10.1007/s11708-010-0036-7

摘要: The effect of the physical and chemical properties of biodiesel fuels on the combustion process and pollutants formation in Direct Injection (DI) engine are investigated numerically by using multi-dimensional Computational Fluid Dynamics (CFD) simulation. In the current study, methyl butanoate (MB) and -heptane are used as the surrogates for the biodiesel fuel and the conventional diesel fuel. Detailed kinetic chemical mechanisms for MB and -heptane are implemented to simulate the combustion process. It is shown that the differences in the chemical properties between the biodiesel fuel and the diesel fuel affect the whole combustion process more significantly than the differences in the physical properties. While the variations of both the chemical and the physical properties between the biodiesel and diesel fuel influence the soot formation at the equivalent level, the variations in the chemical properties play a crucial role in the NO emissions formation.

关键词: biodiesel     diesel engine     CFD simulation     combustion     pollutant formation    

Enhancing the adsorption function of biochar by mechanochemical graphitization for organic pollutant

《环境科学与工程前沿(英文)》 2021年 第15卷 第6期 doi: 10.1007/s11783-021-1418-2

摘要:

• Mechanochemical treatment reduced the calcination temperature for biochar synthesis.

关键词: Biochar     Mechanochemical treatment     Graphitization     Calcination temperature     Organic pollutant    

A new prediction method of industrial atmospheric pollutant emission intensity based on pollutant emission

《环境科学与工程前沿(英文)》 2023年 第17卷 第1期 doi: 10.1007/s11783-023-1608-1

摘要:

● Established a quantification method of pollutant emission standard.

关键词: Industrial atmospheric pollutants     Pollutant emission standards     Quantitative method     Machine learning     Single enterprise    

Highly effective visible-photocatalytic hydrogen evolution and simultaneous organic pollutant degradation

《环境科学与工程前沿(英文)》 2022年 第16卷 第10期 doi: 10.1007/s11783-022-1566-z

摘要:

● An urchin-like OMS/ZIS composite was fabricated by a facile solvothermal method.

关键词: Dual-functional photocatalysts     Oxygen-doped MoS2/ZnIn2S4     H2 evolution     Organic pollutant    

WATER POLLUTION AND AGRICULTURE: MULTI-POLLUTANT PERSPECTIVES

《农业科学与工程前沿(英文)》 2023年 第10卷 第4期   页码 639-647 doi: 10.15302/J-FASE-2023527

摘要:

Agriculture is an important cause of multiple pollutants in water. With population growth and increasing food demand, more nutrients, plastics, pesticides, pathogens and antibiotics are expected to enter water systems in the 21st century. As a result, water science has been shifting from single-pollutant to multi-pollutant perspectives for large-scale water quality assessments. This perspective paper summarizes and discusses four main highlights related to water pollution and agriculture from the multi-pollutant perspective. These highlights reveal the spatial and temporal distribution and main sources of multiple pollutants in waters. Based on the highlights, a scientific agenda is proposed to prioritize solutions for sustainable agriculture (UN Sustainable Development Goal 2) and clean water (UN Sustainable Development Goals 6 and 14). This agenda points out that when formulating solutions for water pollution, it is essential to take into account multiple pollutants and their interactions beyond biogeochemistry.

关键词: water quality     agriculture     multi-pollutant assessment     hotspots     interactions    

Air pollutant control and strategy in coal-fired power industry for promotion of China’s emission reduction

Weiliang WANG, Bo LI, Xuan YAO, Junfu LYU, Weidou NI

《能源前沿(英文)》 2019年 第13卷 第2期   页码 307-316 doi: 10.1007/s11708-019-0620-4

摘要: Coal-fired power industry has always been the major power source in China. As coal-fired power industry consumes around a half of China’s coal production, it is always thought to be a big air pollutant emission source. As more and more strict legislations in coal-fired power industry have been issued by the government, the emission performance in coal-fired power industry has been drastically reduced recently. Based on a brief review of the development of emission control in China’s coal-fired power industry, the affecting mechanism among the development of installed capacities of emission control device, pollutant emission, and emission performances in coal-fired power industry is studied. According to a systematic study on the development of emissions of classified categories, the role of coal-fired power industry as a pollutant source is reevaluated. It is found that, coal-fired power industry has contributed the most to China’s emission reduction, and the barycenter of air pollutant emission has been transformed to other high energy consumption industries, like heat, iron/steel, and cement. Then some development strategies are suggested, such as maintaining the current emission standard in coal-fired power industry; expending the coal-fired power emission standards to categories of heat generation and supply, nonmetallic mineral production and ferrous metals smelting and processing; and controlling other heavy metal by consulting the method of Hg control.

关键词: coal-fired power industry     energy intensive industries     pollutant emission control     NOx     SO2     soot    

An approach to calculating allowable watershed pollutant loads

Yu GUO, Haifeng JIA

《环境科学与工程前沿(英文)》 2012年 第6卷 第5期   页码 658-671 doi: 10.1007/s11783-012-0446-3

摘要: To improve the management of discharge pollutants loads in the reservoirs’ watershed, an approach of the allowable pollutants loads calculation and its allocation, based on the water environment model, was proposed. Establishment of the approach framework was described at first. Under the guidance of this framework, two major steps were as follows: modeling and scenario analysis were involved and should be applied to support the decision of discharge loads management; Environmental Fluid Dynamic Code (EFDC) model was selected as the kernel model in this framework. In modeling step, spatial discretization for establishing cell map in model, data preprocessing, parameter calibration and uncertainty analysis (which is considered as the significantly relevant factor of the margin of safety (MOS)), were conducted. As a result of the research, the model-based approach presented as a combination of estimation and precise calculation, which contributed to scenario analysis step. Some integrated modules, such as scenario simulation, result analysis and plan optimization were implemented as cycles in the scenario analysis. Finally, allowable pollutant loads under various conditions were calculated. The Chaihe Reservoir in Liaoning Province, China was used as a case study for an application of the approach described above. Results of the Chaihe reservoir water quality simulation, show good agreement with field data and demonstrated that the approach used in the present study provide an efficient and appropriate methodology for pollutant load allocation.

关键词: Source water protection     watershed management     pollutants load allocation     Environmental Fluid Dynamic Code (EFDC) modeling     margin of safety     statistical analysis    

Achieving air pollutant emission reduction targets with minimum abatement costs: An enterprise-level

《环境科学与工程前沿(英文)》 2022年 第16卷 第2期 doi: 10.1007/s11783-021-1459-6

摘要:

• Quantification of efficiency and fairness of abatement allocation are optimized.

关键词: Pollutant emission reduction allocation     Emission reduction measures     Total abatement cost     Economic efficiency     Abatement space    

Technologies for pollutant removal and resource recovery from blackwater: a review

《环境科学与工程前沿(英文)》 2023年 第17卷 第7期 doi: 10.1007/s11783-023-1683-3

摘要:

● Blackwater is the main source of organics and nutrients in domestic wastewater.

关键词: Blackwater     Water-flushing toilet     Sanitation     Nutrient recovery     Water reuse     Sustainable development    

A comprehensive simulation approach for pollutant bio-transformation in the gravity sewer

Nan Zhao, Huu Hao Ngo, Yuyou Li, Xiaochang Wang, Lei Yang, Pengkang Jin, Guangxi Sun

《环境科学与工程前沿(英文)》 2019年 第13卷 第4期 doi: 10.1007/s11783-019-1144-1

摘要:

A comprehensive pollutant transformation model for sewer systems is established.

The model comprises fermentation, sulfate reduction and ammonification processes.

Biochemical reactions related to distinct carbon sources are depicted in the model.

Pollutant transformation is attributed to different biochemical reaction processes.

关键词: Gravity sewer     Modeling     Pollutant transformation     Biochemical reaction process    

Time-varying formation tracking for uncertain second-order nonlinearmulti-agent systems

Mao-peng RAN, Li-hua XIE, Jun-cheng LI

《信息与电子工程前沿(英文)》 2019年 第20卷 第1期   页码 76-87 doi: 10.1631/FITEE.1800557

摘要:

Our study is concerned with the time-varying formation tracking problem for second-order multi-agent systems that are subject to unknown nonlinear dynamics and external disturbance, and the states of the followers form a predefined time-varying formation while tracking the state of the leader. The total uncertainty lumps the unknown nonlinear dynamics and the external disturbance, and is regarded as an extended state of the agent. To estimate the total uncertainty, we design an extended state observer (ESO). Then we propose a novel ESO based time-varying formation tracking protocol. It is proved that, under the proposed protocol, the ESO estimation error and the time-varying formation tracking error can be made arbitrarily small. An application to the target enclosing problem for multiple unmanned aerial vehicles (UAVs) verifies the effectiveness and superiority of the proposed approach.

关键词: Multi-agent system     Time-varying formation     Formation tracking     Nonlinear dynamics     Extended state observer (ESO)    

Field test of best management practice pollutant removal efficiencies in Shenzhen, China

Ru ZHANG , Wenbin ZHOU , Richard FIELD , Anthony TAFURI , Shaw L. YU , Keli JIN ,

《环境科学与工程前沿(英文)》 2009年 第3卷 第3期   页码 354-363 doi: 10.1007/s11783-009-0033-4

摘要: Yan Ma, Xiaoming Du, Yi Shi, Deyi Hou, Binbin Dong, Zhu Xu, Huiying Li, Yunfeng Xie, Jidun Fang, Zheng Li, Yunzhe Cao, Qingbao Gu, Fasheng Li. [J]. Front. Environ. Sci. Eng., 2016, 10(6): 6-.Meng Gao,Gregory R. Carmichael,Yuesi Wang,Dongsheng Ji,Zirui Liu,Zifa Wang. [J]. Front. Environ. Sci. Eng., 2016, 10(5): 16-.Wenyan Wang, Wei Ouyang, Fanghua Hao, Yun Luan, Bo Hu. [J]. Front. Environ. Sci. Eng., 2016, 10(4): 17-.Hallvard Ødegaard. [J]. Front. Environ. Sci. Eng., 2016, 10(4): 2-.Guoxia MA,Jinnan WANG,Fang YU,Yanshen ZHANG,Dong CAO. [J]. Front. Environ. Sci. Eng., 2016, 10(2): 288-298.Fei LI,Suocheng DONG,Fujia LI,Libiao YANG. [J]. Front. Environ. Sci. Eng., 2016, 10(2): 276-287.Chao ZENG,Dongjie NIU,Youcai ZHAO. [J]. Front. Environ. Sci. Eng., 2015, 9(6): 949-961.Yang PAN,Xiangru ZHANG,Jianping ZHAI. [J]. Front. Environ. Sci. Eng., 2015, 9(1): 121-130.Kang XIAO, Ying XU, Shuai LIANG, Ting LEI, Jianyu SUN, Xianghua WEN, Hongxun ZHANG, Chunsheng CHEN, Xia HUANG. [J]. Front. Environ. Sci. Eng., 2014, 8(6): 805-819.Shuxiao WANG,Lei ZHANG,Long WANG,Qingru WU,Fengyang WANG,Jiming HAO. [J]. Front.Environ.Sci.Eng., 2014, 8(5): 631-649.Wenqian CAI,Wei MENG,Lusan LIU,Kuixuan LIN. [J]. Front.Environ.Sci.Eng., 2014, 8(5): 737-746.Lili QU,Tianzhu ZHANG,Wei LU. [J]. Front.Environ.Sci.Eng., 2014, 8(4): 570-579.Jiaxing GUO, Huan LIU, Yang JIANG, Dongquan HE, Qidong WANG, Fei MENG, Kebin HE. [J]. Front Envir Sci Eng, 2014, 8(1): 79-88.Wei WEI, Shuxiao WANG, Jiming HAO, Shuiyuan CHENG. [J]. Front Envir Sci Eng, 2014, 8(1): 27-41.Haifeng JIA, Hairong YAO, Shaw L. YU. [J]. Front Envir Sci Eng, 2013, 7(5): 709-720.

关键词: nonpoint source (NPS) pollution control     best management practices (BMPs)     Xikeng Reservoir     Shenzhen     China     BMP treatment train    

3D finite element prediction of chip flow, burr formation, and cutting forces in micro end-milling of

A. DAVOUDINEJAD, P. PARENTI, M. ANNONI

《机械工程前沿(英文)》 2017年 第12卷 第2期   页码 203-214 doi: 10.1007/s11465-017-0421-6

摘要:

Predictive models for machining operations have been significantly improved through numerous methods in recent decades. This study proposed a 3D finite element modeling (3D FEM) approach for the micro end-milling of Al6061-T6. Finite element (FE) simulations were performed under different cutting conditions to obtain realistic numerical predictions of chip flow, burr formation, and cutting forces. FE modeling displayed notable advantages, such as capability to easily handle any type of tool geometry and any side effect on chip formation, including thermal aspect and material property changes. The proposed 3D FE model considers the effects of mill helix angle and cutting edge radius on the chip. The prediction capability of the FE model was validated by comparing numerical model and experimental test results. Burr dimension trends were correlated with force profile shapes. However, the FE predictions overestimated the real force magnitude. This overestimation indicates that the model requires further development.

关键词: 3D finite element modeling     micro end-milling     cutting force     chip formation     burr formation    

Mechanistic insight into the biofilm formation and process performance of a passive aeration ditch (PAD

《环境科学与工程前沿(英文)》 2022年 第16卷 第7期 doi: 10.1007/s11783-021-1494-3

摘要:

• A Passive Aeration Ditch was developed to treat decentralized wastewater.

关键词: Decentralized wastewater     Passive aeration ditch     Biofilm formation     C/N ratio     Salinity     Model simulation    

Is atmospheric oxidation capacity better in indicating tropospheric O formation?

《环境科学与工程前沿(英文)》 2022年 第16卷 第5期 doi: 10.1007/s11783-022-1544-5

摘要:

● This study summarizes and evaluates different approaches that indicate O3 formation.

关键词: O3     AOC     O3 formation regime    

标题 作者 时间 类型 操作

Numerical simulation of biodiesel fuel combustion and emission characteristics in a direct injection diesel engine

Yi REN, Ehab ABU-RAMADAN, Xianguo LI,

期刊论文

Enhancing the adsorption function of biochar by mechanochemical graphitization for organic pollutant

期刊论文

A new prediction method of industrial atmospheric pollutant emission intensity based on pollutant emission

期刊论文

Highly effective visible-photocatalytic hydrogen evolution and simultaneous organic pollutant degradation

期刊论文

WATER POLLUTION AND AGRICULTURE: MULTI-POLLUTANT PERSPECTIVES

期刊论文

Air pollutant control and strategy in coal-fired power industry for promotion of China’s emission reduction

Weiliang WANG, Bo LI, Xuan YAO, Junfu LYU, Weidou NI

期刊论文

An approach to calculating allowable watershed pollutant loads

Yu GUO, Haifeng JIA

期刊论文

Achieving air pollutant emission reduction targets with minimum abatement costs: An enterprise-level

期刊论文

Technologies for pollutant removal and resource recovery from blackwater: a review

期刊论文

A comprehensive simulation approach for pollutant bio-transformation in the gravity sewer

Nan Zhao, Huu Hao Ngo, Yuyou Li, Xiaochang Wang, Lei Yang, Pengkang Jin, Guangxi Sun

期刊论文

Time-varying formation tracking for uncertain second-order nonlinearmulti-agent systems

Mao-peng RAN, Li-hua XIE, Jun-cheng LI

期刊论文

Field test of best management practice pollutant removal efficiencies in Shenzhen, China

Ru ZHANG , Wenbin ZHOU , Richard FIELD , Anthony TAFURI , Shaw L. YU , Keli JIN ,

期刊论文

3D finite element prediction of chip flow, burr formation, and cutting forces in micro end-milling of

A. DAVOUDINEJAD, P. PARENTI, M. ANNONI

期刊论文

Mechanistic insight into the biofilm formation and process performance of a passive aeration ditch (PAD

期刊论文

Is atmospheric oxidation capacity better in indicating tropospheric O formation?

期刊论文