变频器在环境风洞中的应用

利用ACS400变频器的串行通讯功能，通过R232／R485接口，采用Modbus协议，实现计算机与变频器的串行通讯。从而使得变频器的调节可以直接通过计算机程序进行。介绍了这种方法在环境风洞中的应用。     

变频调速技术的原理及应用

变频技术主要用于交流电动机转速的调节,是交流电动机最理想、有发展空间的调速装置,具有卓越的调速性能和显著的节能作用。本文就变频器的调速节能原理、变频器的常用功能以及变频器的控制方式,进行了综合分析,结果表明变频器是企业技术改造和产品更新换代的理想调速装置。     

水轮发电机交流励磁的自动控制

随着电力电子技术与数字控制技术的发展，交流励磁电机应运而生，它有优于传统同步电机的性能。本文论述了水轮发电机交流励磁的原理和特点，对它的可行性进行了分析及论证。并介绍了采用交一直一交变频器对转子绕组进行控制的方法。根据SPWM控制原理，变频器的控制部分采用了软硬结合的方法进行调节。     

变频调速技术在选煤厂入料泵上的应用

叙述了阳煤集团二矿选煤厂选用变频器对压滤机入料泵进行改造的作法。认为,利用变频器可以通过改变频率调节流量,降低电耗,提高了设备的使用寿命,节约维修量和费用。     

变频节能技术在靖边气田的应用分析

通过天然气净化处理过程中流量、压力、循环量的传统调节方式和变频器调节方式的比较,以及对变频器调节方式在启动、节能等方面的分析研究,结果表明：采用变频嚣方式调节和控制比传统的强制调节阀门方式具有品质好、平稳、精度高、电机能耗明显降低、启动电流小等优点,降低运行成本,投资经济。结合在长庆油田靖边气田实际应用中的干扰、控制等问题进行分析,提出解决措施,结果表明在靖边气田天然气处理工艺中采用变频器进行流量、压力、循环量等调节和控制是经济可行的。     

65t／h锅炉风机变频调速技术应用节能分析

介绍了风机应用变频器高速技术的调节原理，日立变频器的特点，并对实际应用切能效果作了比较。     

变频器的转矩控制功能及其应用

转速控制与转矩控制 　　1.转速控制 　　变频调速在绝大多数情况下,都是通过调节频率来调节电动机转速的,称为转速控制,其特点如图1a和图1b所示.当调节变频器的给定信号UG时,变频器的输出频率fx和电动机的转速nM将随UG的改变而改变. 　　……     

液偶调速电动给水泵节能改造方案解析——行星齿轮变矩调速器与变频器方案对比

当前火力发电厂锅炉给水泵普遍采用液力偶合器作为调节装置,但是由于液力偶合器的机械结构和调节方式的限制,液力偶合器调节方式存在效率较低和可调范围较小等不足,随着科技发展和技术创新,多种新型调节装置可用于锅炉给水泵调节。介绍了行星齿轮变矩调速器(VORECON)与变频器(VFD)两种新型调节装置的原理、性能、改造方案和费用,通过实际改造案例详细对比了两种方案的改造后实际效果和费用,得出变频器改造方案优于行星齿轮变矩调速器方案的结论。     

变频技术在凝结水泵上的运用

大部分火电厂通过调节阀门或出口挡板实现截流调节,其不足之处是电力资源损耗较高,有必要进行变频调节改造。为此,以A火电厂为例,首先基于其机组凝结水泵变频改造需求进行了高压变频器选型;其次设计了高压变频器控制方案,并且分析了高压变频器控制系统投运流程,以期为变频技术在凝结水泵上的运用提高参考,从而节约凝结水泵运行电力资源,实现节能减排的凝结水泵变频改造改造目标。     

高压变频调速技术在锅炉引风机上的应用

通过介绍高压变频器在河北钢铁集团宣化钢铁有限责任公司动力厂2台130t／h锅炉引风机的应用效果,表明了变频调节的节能优点,并且对变频器在安装与运行过程中出现的异步电动机的谐波与振动、变频器抗干扰等问题进行了分析,并提出了解决方案。     

水蒸汽热力性质计算中迭代算法研究

在进行水蒸汽热力性质计算时,经常遇到非线性方程的数值解问题。针对水蒸汽性质计算过程中的一维迭代及二维迭代问题,比较了不同迭代格式的收敛性及收敛速度,并对迭代格式的构造提供了建议。计算实例表明,所提出的迭代算法在收敛性和稳定性方面均有所改善。     

Optimization of the reactor configuration on the performance of the cyclic working mode of thermochemical transformers: Reactor miniaturization

Thermochemical processes present a cyclic working mode combining two active phases separated by intermediate phases. A model coupling the solid–gas kinetics and heat and mass transfers in the reactive media was developed to simulate this cyclic working mode. With this model, the optimum values of the working conditions for a fixed reactor configuration had been defined in a previous work. The objective of this paper is to define the best reactor configuration to produce a given cold mean power. Towards this goal, the first stage consists of analyzing the influence of the two parameters characterizing the configuration: the reactor mass and the radius. This sensibility study is then used in a concrete application where a pre-fixed mean power is required.     

Recent development of the inverted configuration organic solar cells

Recent years, the power conversion efficiency (PCE) of normal configuration organic solar cells (OSCs) has obtained rapid progress to reach more than 6% under standard illumination, which is reasonable value for the commercial criterion. More and more research attention has been paid on the stability and lifetime of OSCs. A novel structural OSCs with high work function metal or metal oxide as the top electrode and low work function metal as the bottom anode is proposed and named as inverted configuration OSCs. The inverted configuration OSCs with high work function metal as top cathode could improve OSCs's lifetime, i.e., protecting cells from the damage by oxygen and moisture in air. Furthermore, the inverted configuration OSCs is the appealing alternative to the conventional regular structure due to the inherent vertical phase separation in the polymer active layers and high stability or long device lifetime. The inverted configuration OSCs have not only achieved an impressive PCE of 4.4%, but also exhibited an exceptional device lifetime without encapsulation. In this review article, the recent developments and vital researches on the inverted configuration OSCs are summarized.     

论“热电联产”型燃气—蒸汽联合循环的特性

探讨了“热电联产”型燃气－蒸汽联合循环中热电联产的各种组合方案及其特性,剖析了燃气轮机热电联产系统特性图的物理含义,提出了热电联产型联合循环装置的各种组合方案。     

Optimal design of a hybrid solar–wind-battery system using the minimization of the annualized cost system and the minimization of the loss of power supply probability (LPSP)

Potou is an isolated site, located in the northern coast of Senegal. The populations living in this area have no easy access to electricity supply. The use of renewable energies can contribute to the improvement of the living conditions of these populations. The methodology used in this paper consists in Sizing a hybrid solar–wind-battery system optimized through multi-objective genetic algorithm for this site and the influence of the load profiles on the optimal configuration. The two principal aims are: the minimization of the annualized cost system and the minimization of the loss of power supply probability (LPSP).To study the load profile influence, three load profiles with the same energy (94 kW h/day) have been used.The achieved results show that the cost of the optimal configuration strongly depends on the load profile. For example, the cost of the optimal configuration decreases by 7% and 5% going from profile 1 to 2 and for those ones going from 1 to 3.     

Optimization study of the efficient spindle

In the field of yarn dyeing, the most generally employed method is a type of package dyeing which uses a package of cheese stacked on a spindle made of a perforated tube. Spindles up to now, have been designed without considering the characteristics of dyeing liquid, focusing only on the geometric configuration which cause many problems such as lack of level dyeing. To improve the level dyeing and find the appropriate spindle configuration for the most effective dyeing process, this study examines the spindle flow-field in detail, using a computational method. Flow characteristics inside the spindle have been investigated with varying in porosity, porous diameter and the velocity of the flow. The results show that the total pressure of the flow through the spindle is used to overcome body force. The characteristics of the flow from the porous spindle could also be observed. Based on the results from this study, an effective spindle configuration for level-dyeing has been proposed.     

水环热泵空调系统若干问题的分析与研究

本文根据水环热泵空调系统的最新发展及应用情况,阐述了水环热泵的概念和原理,分析了水环热泵的特点和形式,讨论了水环热泵的适应范围和节能措施,提出了水环热泵的设计注意事项。     

Variable geometry gas turbines for improving the part-load performance of marine combined cycles – Gas turbine performance

The part-load performance of gas and steam turbine combined cycles intended for naval use is of great importance, and it is influenced by the gas turbine configuration and load control strategy. This paper is aimed at quantifying the effects of variable geometry on the gas turbine part-load performance. Subsequently, in another paper, the effects of variable geometry on the part-load performance for combined cycles used for ship propulsion will be presented. Moreover, this paper is aimed at developing methodologies and deriving models for part-load simulations suitable for energy system analysis of various components within gas turbines. Two different gas turbine configurations are studied, a two-shaft aero-derivative configuration and a single-shaft industrial configuration. When both gas turbine configurations are running in part-load using fuel flow control, the results indicate better part-load performance for the two-shaft gas turbine. Reducing the load this way is accompanied by a much larger decrease in exhaust gas temperature for the single-shaft gas turbine than for the two-shaft configuration. As used here, the results suggest that variable geometry generally deteriorates the gas turbine part-load performance.     

The analyses of the heat-up process of a planar, anode-supported solid oxide fuel cell using the dual-channel heating strategy

In the present study, a finite-volume (FV) model has been developed to investigate the thermal behavior, the heat-up time and the corresponding temperature gradient for an anode-supported planar SOFC during the heat-up process. A methane burner is employed for the heat-up of the SOFC. Effects of the burner power and the flow configuration on the temperature distribution, the effective maximum-temperature-gradient, the heat-up time and the required energy in the heat-up process are investigated. The numerical results obtained from the present study show that the single-channel mode is impractical for the SOFC heat-up due to the lengthy heat-up time. For a fixed-power burner, the required heat-up time for the counter-flow configuration is about 25% less than that of the co-flow configuration. For the counter-flow configuration, the temperature gradient is averagely about 17% larger than that for the co-flow configuration. The total energy required for the counter-flow configuration is about 20% less than that for the co-flow configuration. The counter-flow configuration is superior to the others as far as the heat-up time and the required energy are concerned, although it yields a relatively higher maximum-temperature-gradient.     

可持续发展战略与能源环保的对策

本文主要论述能源与环保的关系，能源开发与环境保护对我省国民经济可持续发展的影响，实现能源、环保、经济可持续发展对策。