基于LP与小波包的复杂机电系统监测序列混沌降噪方法

针对流程工业生产系统监测数据存在强噪声和混沌性的特点,提出了一种局部投影方法(Local Projection Method)与小波包方法相结合的信号降噪方法。该方法先利用局部投影方法从动力学系统嵌入流形的角度进行多次迭代降噪,并根据关联维数来判定迭代终止;再利用小波包方法从频率的角度进行降噪,抑制高频噪声的干扰,取得了较好的降噪效果。用Lorenz时间序列进行仿真验证,对仿真时间序列加入不同程度的噪声,对比分析小波包、局部投影与该方法降噪后的相空间、SNR值和最大Lyapunov指数,证明了该方法对于中高强度噪声具有更好的降噪效果。并将该方法用于某压缩机组的实际监测数据降噪,评估三种方法的降噪效果,进一步验证了该方法的优越性。     

低压分解吸收系统的正常调节和异常情况处理

介绍水溶液全循环工艺低压分解系统正常生产控制和异常情况处理的经验.     

Exergoeconomic and exergoenvironmental evaluation of power plants including CO2 capture

CO₂ capture from power plants, combined with CO₂ storage, is a potential means for limiting the impact of fossil fuel use on the climate. In this paper, three oxy-fuel plants with incorporated CO₂ capture are evaluated from an economic and environmental perspective. The oxy-fuel plants, a plant with chemical looping combustion with near 100% CO₂ capture and two advanced zero emission plants with 100% and 85% CO₂ capture are evaluated and compared to a similarly structured reference plant without CO₂ capture. To complete the comparison, the reference plant is also considered with CO₂ capture incorporating chemical absorption with monoethanolamine. Two exergy-based methods, the exergoeconomic and the exergoenvironmental analyses, are used to determine the cost-related and the environmental impacts of the plants, respectively, and to reveal options for improving their overall effectiveness.For the considered oxy-fuel plants, the investment cost is estimated to be almost double that of the reference plant, mainly due to the equipment used for oxygen production and CO₂ compression. Furthermore, the exergoeconomic analysis reveals an increase in the cost of electricity with respect to the reference plant by more than 20%, with the advanced zero emission plant with 85% CO₂ capture being the most economical choice. On the other hand, a life cycle assessment reveals a decrease in the environmental impact of the plants with CO₂ capture, due to the CO₂ and NO_x emission control. This leads to a reduction in the overall environmental impact of the plants by more than 20% with respect to the reference plant. The most environmentally friendly concept is the plant with chemical looping combustion.     

On the temperature distribution in polymer electrolyte fuel cells

This paper presents 2D thermal model of a fuel cell to elucidate some of the issues and important parameters with respect to temperature distributions in PEM fuel cells. A short review on various properties affecting the temperature profile and the heat production in the polymer electrolyte fuel cell is included. At an average current density of 1 A cm⁻², it is found that the maximum temperature of the MEA is elevated by between 4.5 and 15 K compared to the polarisation plate temperature. The smallest deviation corresponds to one dimensional transport, while the largest corresponds to the two dimensional transport considering anisotropic thermal conductivity. The two dimensional thermal model further predicts increased lost work. While most of the heat generation is allocated in the cathode, it is shown that the heat effect may be balanced by the water phase change in the anode. The most significant factor in determining the temperature distribution is the gas channel geometry (width and channel type), followed by the thermal conductivity of the porous transport layer and state of the water in the cell.     

沙角A电厂N300-16.7/538/538机组在小容积流量工况下性能的计算和分析

采用开发的“大功率中间再热汽轮机热力性能和气动性能计算软件包和低压级组小容积流量流场，气动性能计算程序”，对沙角A厂300MW汽轮机低压级组在小容积量工况下性能进行计算和分析，预测了末级产生脱流工况的结果，可供调峰运动参考，图9表2参6。     

汽机第六段抽汽温度高的原因分析及处理

重点分析广州发电厂4台汽轮机第六段抽汽温度高的原因，并有针对性地进行系统改造，使机组运行的安全性、经济性得到提高。     

M701F型燃气轮机热态启动利用余热锅炉蒸汽供辅汽探索

M701F燃气-蒸汽联合循环机组在两班制调峰运行方式下,机组每日启动时需启动锅炉提供辅汽.结合机组辅汽的用户以及余热锅炉的特点,在热态模式下利用余热锅炉的蒸汽来提供辅汽,取得了很好的经济效益和安全可靠性,对同类型机组具有较好的参考价值.     

核电机组低压加热器设计

本文简要介绍了台山核电机组低压加热器的主要参数,水室、管系及外壳的设计特点及要点。     

MHD Equilibrium Configuration Reconstructions for HL-2A Tokamak

The EFIT （Equilibrium Fitting） code is modified for the equilibrium configuration reconstruction in HL-2A. Signals from Langmuir probe （LP） at the divertor targ...     

基于奥洛万微分方程的变厚度LP板轧制力模型

 纵向变厚度LP板是钢铁减量化轧制中的典型产品。轧制力模型是变厚度轧制过程关键模型,直接决定产品尺寸精度。通过引入剪切摩擦与奥洛万平衡微分方程,建立变厚度轧制LP板中各个变形区的应力表达式。改变轧制参数以观察变形区内轧制力变化规律,理论计算结果表明,轧制变形区轧件出口位置由楔形角决定,入口位置及轧制力峰值则与压下量有关;同一压下量下趋厚轧制力峰值小于普通轧制,趋薄轧制力峰值大于普通轧制。