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需求侧响应模式下新能源电站力率问题研究
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作者 梁琛 郑伟 +3 位作者 智勇 崔力心 康晓华 郭振 《电气自动化》 2017年第2期63-65,共3页
针对需求侧响应模式下,新能源具有电源和负荷的"双重角色",导致高昂力率(即功率因数)电费成本问题。首先分析了问题产生的原因;接着提出对更加公平合理的力率计算方法,并以甘肃某光伏电站为例,验证了有效性;最后通过分析甘肃... 针对需求侧响应模式下,新能源具有电源和负荷的"双重角色",导致高昂力率(即功率因数)电费成本问题。首先分析了问题产生的原因;接着提出对更加公平合理的力率计算方法,并以甘肃某光伏电站为例,验证了有效性;最后通过分析甘肃现行的相关规定,提出合理的改进措施和建议。 展开更多
关键词 新能源电站 功率因数 需求侧响应 力率电费 力率计算方法 无功补偿
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The Analysis of Distillation Tray Column Efficiency by Fluid Dynamics and Mass Transfer Computation 被引量:1
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作者 刘春江 袁希钢 余国琮 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2005年第2期153-160,共8页
It has long been found that the flow pattern of the liquid phase on distillation tray is of great importance on distillation process performance. But until now, there was very few published work on quantitative invest... It has long been found that the flow pattern of the liquid phase on distillation tray is of great importance on distillation process performance. But until now, there was very few published work on quantitative investigation of this subject. By combining the computational fluid dynamics (CFD) with the mass transfer equation, a theoretical model is proposed for predicting the details of velocity and concentration distributions as well as the tray efficiency of distillation tray column. Using the proposed model, four different cases corresponding to different assumptions of liquid and vapor flowing condition for a distillation tray column were investigated. In Case I, the distributions of velocity and concentration of the incoming liquid from the downcomer and the uprising vapor from the underneath tray spacing are uniform. In Case n, the distribution of the incoming liquid is non-uniform but the uprising vapor is uniform. In Case HI, the distribution of the incoming liquid is uniform but the uprising vapor is non-uniform. In Case IV, the distributions of both the incoming liquid and the uprising vapor are non-uniform. The details of velocity and concentration distributions on a multiple sieve tray distillation column in four different cases were simulated using the proposed model. It is found that the shape of the simulated concentration profiles of vapor and the liquid is quite different from case to case. The computed results also show that the tray efficiency is highly reduced by the maldistribution of velocity and concentration of the incoming liquid and uprising vapor. The tray efficiency for Case I is higher than Case Ⅱ or Case Ⅲ, and that for Case Ⅳ is the lowest. It also reveals that the accumulated effect of maldistribution becomes more pronounced when the number of column trays increased. The present study demonstrates that the use of computational method to predict the mass transfer efficiency for the tray column, especially for the large one, is feasible. 展开更多
关键词 CFD distillation tray column mass transfer
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Power Flow Calculation Method of Large Shipboard Power System
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作者 兰海 李久芳 张殿华 《Journal of Marine Science and Application》 2010年第1期93-98,共6页
The effect of line voltage drop is considered larger on loads, especially on asynchronous motor, transformers and other non-linear load parameters in power system of large ships. A novel power flow method based on imp... The effect of line voltage drop is considered larger on loads, especially on asynchronous motor, transformers and other non-linear load parameters in power system of large ships. A novel power flow method based on improved node voltage method is proposed, and a typical ship power system, which has 2 power stations and 10 nodes, with closed-loop design but open-loop operation, is taken as an example. Simulation results show that the improved power flow calculation method has achieved higher accuracy and better convergence. 展开更多
关键词 power flow method node voltage method asynchronous motor TRANSFORMER
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Mechanistic study and kinetic properties of the CF_3CHO+Cl reaction
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作者 GAO Hong WANG Ying +1 位作者 WANG Qin LIU JingYao 《Science China Chemistry》 SCIE EI CAS 2012年第10期2197-2201,共5页
Theoretical investigations have been carried out on the mechanism and kinetics for the reaction of CF 3 CHO + Cl using duallevel direct dynamics method. The potential energy surface information was obtained at the MCQ... Theoretical investigations have been carried out on the mechanism and kinetics for the reaction of CF 3 CHO + Cl using duallevel direct dynamics method. The potential energy surface information was obtained at the MCQCISD/3//MP2/cc-pVDZ level and the kinetic calculations were done using variational transition state theory with interpolated single-point energy (VTST-ISPE) approach. The calculated results show that the reaction proceeds primarily via the H-abstraction channel, while the Cl-addition channel is unfavorable due to the higher barriers. The improved canonical variational transition-state theory (ICVT) with the small-curvature tunneling correction (SCT) was used to calculate the rate constants. The theoretical rate constants at room temperature are in general agreement with the experimental values. A three-parameter rate constant expression was fitted over a wide temperature range of 200-2000 K. 展开更多
关键词 direct dynamics rate constant variational transition-state theory
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