Search | Engineering

订阅投稿

首页工程期刊工程焦点工程成就工程前沿关于我们 English

资源类型

期刊论文 886

年份

2024 1

2023 75

2022 59

2021 60

2020 54

2019 56

2018 63

2017 63

2016 38

2015 66

2014 41

2013 48

2012 35

2011 34

2010 38

2009 33

2008 19

2007 32

2006 8

2005 9

展开︾

关键词

制造强国 8

汽车强国 5

低碳经济 4

制造业 4

电力系统 4

中长期 3

海上风电 3

Z箍缩 2

低成本 2

低碳 2

低碳发展 2

制造大国 2

功率谱密度 2

化石能源 2

医院中子照射器 2

发展趋势 2

可再生能源 2

可持续发展 2

天然气 2

展开︾

检索范围：

排序：展示方式：

Research progress on low dielectric constant modification of cellulose insulating paper for power transformers

《化学科学与工程前沿（英文）》 2023年第17卷第8期页码 991-1009 doi: 10.1007/s11705-022-2259-7

摘要： Because of the increase in the transmission voltage levels, the demand for insulation reliability of power transformers has increasingly become critical. Cellulose insulating paper is the main insulating component of power transformers. To improve the insulation level of ultrahigh voltage transformers and reduce their weight and size, reducing the dielectric constant of oil-immersed cellulose insulating paper is highly desired. Cellulose is used to produce power-transformer insulating papers owing to its excellent electrical properties, renewability, biodegradability and abundance. The dielectric constant of a cellulose insulating paper can be effectively reduced by chemical or physical modification. This study presents an overview of the foreign and domestic research status of the use of modification technology to reduce the dielectric constant of cellulose insulating papers. All the mentioned methods are analyzed in this study. Finally, some recommendations for future modified cellulose insulating paper research and applications are proposed. This paper can provide a reference for further research on low dielectric constant cellulose insulating paper in the future.

关键词： low dielectric constant chemical and physical modification cellulose insulating paper transformer nanomaterials.

HTML PDF 收藏

Fuel poverty and low carbon emissions: a comparative study of the feasibility of the hybrid renewableenergy systems incorporating combined heat and power technology

《能源前沿（英文）》 2022年第16卷第2期页码 336-356 doi: 10.1007/s11708-021-0748-x

摘要： Fuel poverty is most prevalent in North East England with 14.4% of fuel poor households in Newcastle upon Tyne. The aim of this paper was to identify a grid connected renewable energy system coupled with natural gas reciprocating combined heat and power unit, that is cost-effective and technically feasible with a potential to generate a profit from selling energy excess to the grid to help alleviate fuel poverty. The system was also aimed at low carbon emissions. Fourteen models were designed and optimized with the aid of the HOMER Pro software. Models were compared with respect to their economic, technical, and environmental performance. A solution was proposed where restrictions were placed on the size of renewable energy components. This configuration consists of 150 kW CHP, 300 kW PV cells, and 30 kW wind turbines. The renewable fraction is 5.10% and the system yields a carbon saving of 7.9% in comparison with conventional systems. The initial capital investment is $1.24 million which enables the system to have grid sales of 582689 kWh/a. A conservative calculation determined that 40% of the sales can be used to reduce the energy cost of fuel poor households by $706 per annum. This solution has the potential to eliminate fuel poverty at the site analyzed.

关键词： greenhouse gas control low carbon target grid connected renewable fraction fuel poverty combined heat and power HOMER Pro

HTML PDF 收藏

A low power, eco-friendly multipurpose thermoelectric refrigerator

N. Jagan Mohan REDDY

《能源前沿（英文）》 2016年第10卷第1期页码 79-87 doi: 10.1007/s11708-015-0380-8

摘要： There has been an immense endeavor to mitigate global warming in spite of which it has only been worse. This paper presents the design and implementation of a low power and eco-friendly refrigeration system using the thermoelectric effect. The conventional refrigerators make use of complex mechanisms which involves synchronous operation of various units, namely the compressor, condensers, expansion valves, evaporator, refrigerant and so on. But a thermoelectric refrigerator exploits the principle of the Peltier effect, thus avoiding the utilization of these complex components. This even helps curb the release of harmful chlorofluorocarbons (CFCs) into the atmosphere which contributes to the increase in global temperature. Moreover, the temperature can be controlled and set to required values with the help of a microcontroller. Hence, this can be used both for domestic and commercial purposes. The unit does not eject any harmful gases. Therefore, the heat expelled from the unit can be tapped for heating utilities, making the use of this device versatile in its application. Thus this proposal aims not only at reducing the air pollutants by not contributing to it but also at reducing the power consumption.

关键词： low power eco-friendly multipurpose TEC-12706 Peltier effect microcontroller (P89V51RD2BN) temperature control

HTML PDF 收藏

Practice on Ultra-low Emission and Energy Efficient Technologies in Coal-fired Power Plants

Yin-biao Chen,Yi Zhang,Wen Ling

《工程管理前沿（英文）》 2016年第3卷第4期页码 377-383 doi: 10.15302/J-FEM-2016045

摘要： Restructuring of China’s energy mix is accelerating due to factors such as energy security, economic cost, climate change and environmental pressure. Efficient and clean utilization of coal-generated power therefore plays an increasingly important role in solving energy and environmental problems in China. Coal-fired power plants, with Shenhua Guohua Sanhe as one of the pioneers, followed trend of this era and adopted multiple ultra-low emission and energy efficient technologies, striving to be an industry leader in environmental protection, profitability and innovation. As a result, coal-fired power plants have seen ultra-low emissions of air pollutants and record-high energy efficiency, opening up a new era of more efficient and cleaner coal generation. By the end of 2015, Shenhua Group had had 45 ultra-low emission coal units, providing strong support for implementing of the national policy on ultra-low emission and energy efficient retrofit of coal-fired power plants across China.

关键词： coal power generation ultra-low emission energy efficiency

HTML PDF 收藏

Viability of a concentrated solar power system in a low sun belt prefecture

Rahul BHATTACHARJEE, Subhadeep BHATTACHARJEE

《能源前沿（英文）》 2020年第14卷第4期页码 850-866 doi: 10.1007/s11708-020-0664-5

摘要： Concentrating solar power (CSP) is considered as a comparatively economical, more efficient, and large capacity type of renewable energy technology. However, CSP generation is found restricted only to high solar radiation belt and installed where high direct normal irradiance is available. This paper examines the viability of the adoption of the CSP system in a low sun belt region with a lower direct normal irradiance (DNI). Various critical analyses and plant economics have been evaluated with a lesser DNI state. The obtained results out of the designed system, subjected to low DNI are not found below par, but comparable to some extent with the performance results of such CSP plants at a higher DNI. The analysis indicates that incorporation of the thermal energy storage reduces the levelized cost of energy (LCOE) and augments the plant capacity factor. The capacity factor, the plant efficiency, and the LCOE are found to be 32.50%, 17.56%, and 0.1952 $/kWh, respectively.

关键词： concentrated solar power direct normal irradiance plant performance plant economics thermal energy storage

HTML PDF 收藏

Impact of “ultra low emission” technology of coal-fired power on PM

Xiao LIU, Zhilin LIU, Weidong JIAO, Xuan LI, Jintai LIN, Anthony KU

《能源前沿（英文）》 2021年第15卷第1期页码 235-239 doi: 10.1007/s11708-017-0518-y

摘要： In response to severe haze pollution, the Chinese government has announced a series of policies focusing on controlling emissions from coal consumption. “Ultra-low emission” (ULE) technologies have the potential to dramatically reduce emissions from coal-fired power plants, and have been deployed at some facilities in recent years. This paper estimated the potential environmental benefits of the widespread adoption of ULE in the Jing-Jin-Ji Region. Atmospheric modeling scenarios were analyzed for three cases: a “standard” scenario assuming no ULE deployment, a “best case” scenario assuming complete adoption of ULE across all power plants in the region, and a “natural gas” scenario, assuming emissions factors consistent with natural gas-fired power generation. The simulations show that the widespread adoption of ULE technologies can be an effective and economically competitive option for reducing the impacts of coal-fired power generation on air quality.

关键词： air quality atmospheric model coal Jing-Jin-Ji Region PM_2.5 ultra-low emissions

HTML PDF 收藏

Impact of “ultra low emission” technology of coal-fired power on PM

Xiao LIU, Zhilin LIU, Weidong JIAO, Xuan LI, Anthony KU

《能源前沿（英文）》 2021年第15卷第2期页码 564-564 doi: 10.1007/s11708-018-0551-5

HTML PDF 收藏

Quantum-dot cellular automata based reversible low power parity generator and parity checker design for

Jadav Chandra DAS,Debashis DE

《信息与电子工程前沿（英文）》 2016年第17卷第3期页码 224-236 doi: 10.1631/FITEE.1500079

摘要： Quantum-dot cellular automata (QCA) is an emerging area of research in reversible computing. It can be used to design nanoscale circuits. In nanocommunication, the detection and correction of errors in a received message is a major factor. Besides, device density and power dissipation are the key issues in the nanocommunication architecture. For the first time, QCA-based designs of the reversible low-power odd parity generator and odd parity checker using the Feynman gate have been achieved in this study. Using the proposed parity generator and parity checker circuit, a nanocommunication architecture is proposed. The detection of errors in the received message during transmission is also explored. The proposed QCA Feynman gate outshines the existing ones in terms of area, cell count, and delay. The quantum costs of the proposed conventional reversible circuits and their QCA layouts are calculated and compared, which establishes that the proposed QCA circuits have very low quantum cost compared to conventional designs. The energy dissipation by the layouts is estimated, which ensures the possibility of QCA nano-device serving as an alternative platform for the implementation of reversible circuits. The stability of the proposed circuits under thermal randomness is analyzed, showing the operational efficiency of the circuits. The simulation results of the proposed design are tested with theoretical values, showing the accuracy of the circuits. The proposed circuits can be used to design more complex low-power nanoscale lossless nanocommunication architecture such as nano-transmitters and nano-receivers.

关键词： Quantum-dot cellular automata (QCA) Parity generator Parity checker Feynman gate Nanocommunication Power dissipation

HTML PDF 收藏

Estimation of power in low velocity vertical axis wind turbine

Sampath S. S.,Sawan SHETTY,Chithirai Pon Selvan M.

《机械工程前沿（英文）》 2015年第10卷第2期页码 211-218 doi: 10.1007/s11465-015-0338-x

摘要：

The present work involves in the construction of a vertical axis wind turbine and the determination of power. Various different types of turbine blades are considered and the optimum blade is selected. Mechanical components of the entire setup are built to obtain maximum rotation per minute. The mechanical energy is converted into the electrical energy by coupling coaxially between the shaft and the generator. This setup produces sufficient power for consumption of household purposes which is economic and easily available.

关键词： wind turbine shaft design power generation generator

HTML PDF 收藏

Improvement to observability measures of LFO modes in power systems with DFIGs

Shenghu LI

《能源前沿（英文）》 2021年第15卷第2期页码 539-549 doi: 10.1007/s11708-019-0617-z

摘要： Observation of the low-frequency oscillation (LFO) modes in power systems is important to design the damping scheme. The state equations of the power system with the doubly-fed induction generators (DFIGs) are derived to find the LFO modes related to the synchronous generator (SGs) and the DFIGs. The definition of the observability measure is improved to consider the initial output and the attenuation speed of the modes. The sensitivities of the observability measures to the control parameters are derived. The numerical results from the small and large-disturbance validate the LFO modes caused by the DFIGs, and different observability measures are compared. Adjustment of the control parameters is chosen based on the sensitivity model to improve the observability and damping ratio of the LFO mode, and the stability of the wind power system.

关键词： wind power system low-frequency oscillation (LFO) observability measure sensitivity doubly-fed induction generator (DFIG)

HTML PDF 收藏

Analysis and design of pulse frequency modulation dielectric barrier discharge for low power applications

Tang-tang GUO,Xing-liang LIU,Shi-qiang HAO,Chi ZHANG,Xiang-ning HE

《信息与电子工程前沿（英文）》 2015年第16卷第3期页码 249-258 doi: 10.1631/FITEE.1400185

摘要： For low power dielectric barrier discharge (DBD) used in small-size material treatment or portable devices, highstep transformer parasitic capacitance greatly influences the performance of the resonant converter as it is of the same order of magnitude as the equivalent capacitance of DBD load. In this paper, steady-state analysis of the low power DBD is presented, considering the inevitable parasitic capacitance of the high-step transformer. The rectifier-compensated first harmonic approximation (RCFHA) is applied to linearize the equivalent load circuit of DBD at low frequency and the derived expressions are accurate and convenient for the analysis and design of the power supply. Based on the proposed linear equivalent load circuit, the influence of transformer parasitic capacitance on the key parameters, including the frequency range and the applied electrode voltage, is discussed when the power is regulated with pulse frequency modulation (PFM). Also, a design procedure is presented based on the derived expressions. A prototype is constructed according to the design results and the accuracy of the design is verified by experimental results.

关键词： Dielectric barrier discharge Rectifier-compensated first harmonic approximation Parasitic capacitance Power converter design

HTML PDF 收藏

A low power consumption control scheme: application to a piezostack-based active mount

T. LOUKIL, O. BAREILLE, M. N. ICHCHOU, M. HADDAR

《机械工程前沿（英文）》 2013年第8卷第4期页码 383-389 doi: 10.1007/s11465-013-0274-6

摘要：

Piezostack-based active mounts have shown great efficiency for vibration control in a wide frequency range. In this paper, we investigate the performances of the global semi-active control strategy presented by Ichchou et al. [ ] for a control system consisting of an active mount and a supported mass. The control strategy allows extracting vibrations energy of the supported mass, storing it in accumulators to be reused for powering in part the actuators (two piezostacks). Consequently, energy needs are reduced versus good control performances comparable to those of the active control based on the negative velocity feedback. The performances of the controller are evaluated in both frequency (transmitted force) and time (acceleration) domains which show that vibrations of the supported mass due to base excitations are efficiently attenuated with the proposed law. An energetic analysis confirms the reduced energy requirement compared to the active scheme.

关键词： hybrid mount energy control piezoelectric harvesting

HTML PDF 收藏

Tianrun Xia County phase III 99.5 MW wind power engineering technology and green innovation

Xiaobo WANG

《工程管理前沿（英文）》 2019年第6卷第1期页码 131-137 doi: 10.1007/s42524-019-0012-9

摘要：

关键词： low carbon design green standard system environmental protection sustainable development Tianrun Sijiao Town wind farm

HTML PDF 收藏

大中功率节能调速传动的合理电压等级

马小亮

《中国工程科学》 2001年第3卷第11期页码 80-84

摘要：

大中功率风机和泵采用变频调速可节约大量电能，大部分功率在0.2～2 MW范围中。我国现在200 kW以上的电机多是中压，现行中压电网多为10 kV，选用10 kV直接变频从技术和经济角度看都不太合理。由于变频器输入侧都有变压器，因此电机和变频器没有必要和电网一致。文章讨论不同功率段的合理电压等级以及在电机电压和电网电压不同情况下当变频器出现故障时如何实现旁路工作。

关键词：大中功率节能调速合理电压等级低压变频中压变频旁路

HTML PDF 收藏

煤炭清洁发电技术进展与前景

岑可法,倪明江,高翔,骆仲泱,王智化,郑成航

《中国工程科学》 2015年第17卷第9期页码 49-55

摘要：

近年来，我国大气复合污染问题日益突出，燃煤是造成大气污染的主要原因之一，我国电力行业耗煤量约占全国耗煤总量的一半，实现燃煤电厂烟气污染物高效控制是重中之重。本文介绍了我国煤炭清洁发电实现超低排放的最新进展及未来发展前景。通过理论研究、技术研发及集成应用，形成了符合我国国情的燃煤烟气污染物超低排放技术路线，建立了超低排放清洁环保岛，实现了污染物排放优于天然气机组排放标准限值，为我国大气污染防治特别是高用能密度区域的污染物减排提供了一条重要出路。研究综述了近年来我国超低排放技术的示范应用情况，通过费效分析表明超低排放可实现污染物大幅度减排，具有良好的环境、经济和社会效益。未来，我国燃煤电厂还将进一步发展烟气污染物深度脱除技术及二氧化碳捕集技术，最终实现燃煤烟气污染物的近零排放，为建设全世界最清洁的燃煤电厂奠定坚实的技术基础。

关键词：煤炭；高用能密度；大气污染；超低排放；清洁发电

HTML PDF 收藏

标题作者时间类型操作

Research progress on low dielectric constant modification of cellulose insulating paper for power transformers

期刊论文

Fuel poverty and low carbon emissions: a comparative study of the feasibility of the hybrid renewableenergy systems incorporating combined heat and power technology

期刊论文

A low power, eco-friendly multipurpose thermoelectric refrigerator

N. Jagan Mohan REDDY

期刊论文

Practice on Ultra-low Emission and Energy Efficient Technologies in Coal-fired Power Plants

Yin-biao Chen,Yi Zhang,Wen Ling

期刊论文

Viability of a concentrated solar power system in a low sun belt prefecture

Rahul BHATTACHARJEE, Subhadeep BHATTACHARJEE

期刊论文

Impact of “ultra low emission” technology of coal-fired power on PM

Xiao LIU, Zhilin LIU, Weidong JIAO, Xuan LI, Jintai LIN, Anthony KU