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Ran P.,North China Electrical Power University | Li G.-S.,Tianjin Jinneng Investment Company | Liao D.,Baosteel | Zhu W.-P.,Shenyang Institute of Engineering
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2010

Considering the thermal system distinguishing feature of advance boiling water reactor (ABWR) nuclear power plant, a steam-water distribute state equation had been established and a matrix for calculating the efficiency was derived by the equivalent enthalpy drop theory, the theory of matrix and the normal thermal-equilibrium method, suitable for quantitative thermal efficiency analysis of thermodynamic system of ABWR nuclear power unit. The structure of this matrix has a mapping relationship with the thermodynamic system of ABWR nuclear power unit, and it can simplify the thermal economic analysis of ABWR nuclear power plant, and provides a theoretic principle for analysing the economics of the thermal system of ABWR nuclear power unit. An example was given to illustrate the validity of the method, and it indicated that the thermal economics diagnostic method is well defined and easy to be used in system design and operation diagnosis. © 2010 Chin.Soc.for Elec.Eng. Source


Chen H.,North China Electrical Power University | Liu H.,Tianjin Jinneng Investment Company | Gao J.,North China Electrical Power University | Wei R.,North China Electrical Power University | Shi Y.,Hebei Electric Power Research Institute
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2012

This paper made a systematic test on the solids circulation rate and established BP neural network with momentum added which gives an efficient simulation in the rate with a forecasting value received. For the purpose of giving a criterion to assess the average diversion of forecasting value from the tested, Mean Diversion Extent was defined. It shows that the diversion of forecasting value from the tested is not more than 5kg/(m2·s) with a relative error within ±20%, Mean Diversion Extent no more than 8% by means of making a comparison between the forecasting value and the tested. It proves that the BP neural network model has a better forecasting ability. Source


Ran P.,North China Electrical Power University | Li G.,Tianjin Jinneng Investment Company | Zhang S.,North China Electrical Power University | Wang S.,North China Electrical Power University
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2012

Based on the analysis of the structure features of the coal-fired power unit thermal system, graph theory was introduced into the power unit thermal system energy-saving analysis fields, and the division principles and the expression way based on graph theory of power unit thermal system were stipulated. The rules to fill the digraph weighted adjacency matrix of coal-fired power unit thermal system were determined. Combined with the energy conservation law, mass conservation law and the digraph weighted adjacency matrix, the digraph weighted adjacency equation of the coal-fired power unit thermal system, fuel consumption rate & fuel differential equation were deduced. The quantitative analysis method for the power plant thermal system based on graph theory studies the power unit thermal system by the way of graph, and describes the energy flow & mass flow of thermal system by binary relation graph combined with point and line. This method is of standard and concise form, whose physical meaning is well-expressed. It is a novel thermal economics analysis method of coal-fired power unit thermal system. An example was given to illustrate the validity of the method. © 2012 Chinese Society for Electrical Engineering. Source


Huang J.,North China Electrical Power University | Huang J.,Beijing Electrical Power Research Institute | An L.,North China Electrical Power University | Yang Y.,North China Electrical Power University | And 2 more authors.
Dongli Gongcheng Xuebao/Journal of Chinese Society of Power Engineering | Year: 2011

Experimental tests were conducted to study the law of split ratio of a gypsum cyclone varying with its overflow pipe's insertion depth, wall thickness, and the size ratio of its overflow pipe to bottom flow pipe (k). Results show that both the wall thickness and insertion depth of overflow pipe have an optimum value, in which case the split ratio is maximized. The influence of inlet pressure on split ratio reduces with rising ratio k; the smaller the k value is, the obvious the influence will be. The separation efficiency increases slightly with the rise of inlet pressure at the premise that the inner diameter of cyclone column and inlet pipe, the cone angle, the wall thickness of overflow pipe and the k ratio are all fixed. Source


Chen H.,North China Electrical Power University | Wang Y.,North China Electrical Power University | Li D.,Tianjin Jinneng Investment Company | Jiang H.,North China Electrical Power University | Wu Z.,North China Electrical Power University
Dongli Gongcheng Xuebao/Journal of Chinese Society of Power Engineering | Year: 2014

Modulus maxima lines of pressure fluctuation signals measured from the wind cap in a cold bubbling fluidized bed setup were calculated using wavelet modulus maxima method under conditions of different fluidization numbers, static bed heights and bed material particle sizes, so as to analyze the influence of above factors on the singularities of corresponding pressure fluctuation signals. Experimental results show that the local singularities of pressure fluctuation signals increase with decreasing fluidization number, rising static bed height and increasing bed material particle size, indicating that the wavelet modulus maxima lines can be used to describe the local singularities of pressure fluctuation signals, and to reflect the gas-solid fluidization conditions in bubbling fluidized beds at different fluidization numbers, static bed heights and bed material particle sizes. © 2014, Editorial Department of Chinese Society of Power Engineering. All right reserved. Source

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