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HIGH emission performance IMPREGNATED DISPENSER CATHODE

Journal of Electronics(China) 2013年第4期30卷 417-422页

作者： Yin Shengyi Peng Zhen Zheng Qiang Wang Yu Key Laboratory of High Power Microwave Sources and Technologies Institute of Electronics Chinese Academy of Sciences University of Chinese Academy of Sciences

In order to obtain higher emission performance than that of a traditional M-type cathode, we have developed a new type impregnated dispenser cathode. The new cathode is impregnated with a new active substance with molar ratio of 26BaO·29SrO·8Sc2O3 ·7CaO·Al2O3 . This paper introduces the emission performance, surface active material, and work function of the new cathode. At 1100℃B , the DC current density and pulse current density are 30.6±1.0 A/cm2 and 171.6±2.8 A/cm2 , respectively, 2.1 and 5.4 times of that of an M-type cathode. The work function of the new cathode is 1.668± 0.002 eV. High concentration O-Al-Sc-Sr-Ba and O-Al-Sc-Ba are found in the pores and at pore edges, respectively. By comparing the emission performances and surface characteristics of as-polished and as-cleaned cathodes, it is proposed that, the emission around pore ends forms the major part of the total emission for the new cathodes.

关键词： Dispenser cathode M-type cathode Sc2O3 SrO emission performance

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Permitted emissions of major air pollutants from coal-fired power plants in China based on best available control technology

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Frontiers of Environmental Science & Engineering 2018年第5期12卷 62-74页

作者： Xiaohui Song Chunlai Jiang Yu Lei Yuezhi Zhong Yanchao Wang Atmospheric Environment Department Chinese Academy for Environmental PlanningBeijing 100012China College of Environmental Science and Engineering Nankai UniversityTianjin 300350China

Based on the activity level and technical information of coal-fired power-generating units(CFPGU)obtained in China from 2011 to 2015,we,1)analyzed the time and spatial distribution of SO_(2) and NOx emission performance of CFPGUs in China;2)studied the impact of installed capacity,sulfur content of coal combustion,and unit operation starting time on CFPGUs’pollutant emission performance;and 3)proposed the SO_(2) and NOx emission performance standards for coal-fired power plants based on the best available control *** results show that:1)the larger the capacity of a CFPGU,the higher the control level and the faster the improvement;2)the CFPGUs in the developed eastern regions had significantly lower SO_(2) and NOx emission performance values than those in other provinces due to better economic and technological development and higher environmental management levels;3)the SO_(2) and NOx emission performance of the Chinese thermal power industry was significantly affected by the single-unit capacity,coal sulfur content,and unit operation starting time;and 4)based on the achievability analysis of best available pollution control technology,we believe that the CFPGUs’SO_(2) emission performance reference values should be 0.34 g/kWh for active units in general areas,0.8 g/kWh for active units in high-sulfur coal areas,and 0.13 g/kWh for newly built units and active units in key *** addition,the NOx emission performance reference values should be 0.35 g/kWh for active units in general areas and 0.175 g/kWh for new units and active units in key areas.

关键词： Coal-fired power-generating units(CFPGU) emission performance Best available control technology

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Study of CNG／diesel dual fuel engine＇s emissions by means of RBF neural network

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Journal of Zhejiang University Science 2004年第8期5卷 960-965页

作者：刘震涛费少梅 CollegeofMechanicalandEnergyEngineering ZhejiangUniversityHangzhou310027China

Great efforts have been made to resolve the serious environmental pollution and inevitable declining of energy resources. A review of Chinese fuel reserves and engine technology showed that compressed natural gas (CNG)/diesel dual fuel engine (DFE) was one of the best solutions for the above problems at present. In order to study and improve the emission performance of CNG/diesel DFE, an emission model for DFE based on radial basis function (RBF) neural network was developed which was a black-box input-output training data model not require priori knowledge. The RBF centers and the connected weights could be selected automatically according to the distribution of the training data in input-output space and the given approximating error. Studies showed that the predicted results accorded well with the experimental data over a large range of operating conditions from low load to high load. The developed emissions model based on the RBF neural network could be used to successfully predict and optimize the emissions performance of DFE. And the effect of the DFE main performance parameters, such as rotation speed, load, pilot quantity and injection timing, were also predicted by means of this model. In resumé, an emission prediction model for CNG/diesel DFE based on RBF neural network was built for analyzing the effect of the main performance parameters on the CO, NOx emissions of DFE. The predicted results agreed quite well with the traditional emissions model, which indicated that the model had certain application value, although it still has some limitations, because of its high dependence on the quantity of the experimental sample data.

关键词： Dual fuel engine emission performance RBF neural network

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New controllable premixed combustion for dimethyl ether engine

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Science Bulletin 2003年第11期48卷 1157-1160页

作者： SONG Jun,HUANG Zhen,QIAO Xinqi,WANG Wanli,FANG Junhua,ZHANG Guangde Shanghai Jiaotong Unversity School of Mechnical and Power Engineering Shanghai Jiaotong Unversity Shanghai 200030 China Shanghai 200030 China Shanghai 200030 China Shanghai 200030 China School of Mechnical and Power Engineering Shanghai 200030 China Shanghai 200030 China Shanghai Jiaotong Unversity School of Mechnical and Power Engineering Shanghai Jiaotong Unversity School of Mechnical and Power Engineering Shanghai Jiaotong Unversity School of Mechnical and Power Engineering Shanghai Jiaotong Unversity School of Mechnical and Power Engineering

A new concept of the controllable premixed combustion (CPC) system was proposed for dimethyl ether (DME) to explore a new approach to achieving ultra-low NOX emissions with the zero level of particulate matter exhaust emissions. The DME fuel was injected into the premix chamber by means of the electronically controlled low pressure injection system, then the mixture formation and combustion process were controlled with a control-valve set between the main chamber and the premix chamber. The test bench was constructed based on a single diesel engine. Preliminary studies demonstrated that ultra-low NOX emissions had been realized with zero particulate matter emissions under the optimum specifications of the DME engine, NOX emissions were less than 65 10-6. According to the engine combustion analysis, it was found that the control-valve played an important role in the pre-mixture formation and ignition timing.

关键词： dimethyl ether controllable premixed combustion emission performance combustion characteristic.

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