核电站汽轮机运行性能监测与诊断

就核电汽轮机与火电汽轮机的差异以及由此差异引起的湿蒸汽汽轮机通流性能表征与热平衡计算的难点进行了论述,提出了利用特征通流面积CFA来表征核电汽轮机的通流性能和采用小误差热平衡法来计算核电汽轮机的热平衡图,应用小误差热平衡法和特征通流面积成功开发了核电站热力性能在线监测与分析系统和核电站汽轮机全面热力试验计算软件,并将这两项技术应用在大亚湾核电机组热力性能在线监测与分析系统和岭澳二期核电机组全面热力试验中.结果表明：实际运行监测中特征通流面积监测值的测量精度可控制在1%以内.     

火电厂热力系统分析计算研究

在对电厂各设备的运行性能和计算方法分析的基础上,寻求共通性构造出合理程序模型,开发编制了详尽的电厂热力系统分析计算软件以适用于机组性能在线计算。实例计算验证了方法的有效性,同时对结果进行了分析。表4参16     

火电厂热力系统炯分析计算研究

在对电厂各设备的运行性能和炯计算方法分析的基础上,寻求共通性构造出合理程序模型,开发编制了详尽的电厂热力系统分析计算软件以适用于机组性能在线计算.实例计算验证了方法的有效性,同时对结果进行了分析.表4参16     

火电厂热力系统Yong分析计算研究

在对电厂各设备的运行性能和Yong计算方法分析的基础上，寻求共通性构造出合理程序模型，开发编制了详尽的电厂热力系统分析计算软件以适用于机组性能在线计算。实例计算验证了方法的有效性，同时对结果进行了分析。表4参16     

一种分析热力系统热经济性的新方法——凝汽系数法

从热力系统循环的反平衡角度出发,给出了热力系统经济性计算分析的一种新方法——凝汽系数计算法。它不仅可以用于热力系统整体计算,而且为局部定量计算提供了极大的方便。以某300MW机组为例进行计算,并与其它的热力系统分析方法计算结果相比较,证明该方法计算的精确性。     

应用流体网络理论求解热力系统流体网络模型的探索

热力系统分析需要知道工质的质量流量和各个计算节点的压力分布。为获得热力系统流体网络内工质质量流量和压力分布情况,根据流体网络理论思想,建立了热力系统的流体网络模型。该模型在合理假设基础上,将热力系统流体网络比拟为复杂直流电路,从而将基尔霍夫电压、电流定律引入热力系统流体网络模型的计算,使热力系统流体网络计算变得简洁、准确。计算结果验证了模型可靠,建模方法可行。     

火电厂热力系统热力单元矩阵分析法

热力系统的热经济性分析,是火电感和节能的重要技术手段,该文借助“循环函数法”的基本思想,结合矩阵理论,提出了一种更为科学有效的火电厂热力系统分析计算的新技术－－热力单元矩阵分析法。     

针对电厂SIS系统组态的热力系统通用组件对象(COM)模型

针对电厂厂级监控信息系统(SIS)的特点要求,利用COM软件思想开发了热力系统各通用模块组件模型和通用热力系统模型组件,能自动根据组态软件产生的不同机组热力系统结构,构成热力系统对象实例,组件对象间通过接口通信传递能流和质流信息,在线计算并监测电厂热力系统各经济性能和能损。并以回热加热器和整体热力系统为例介绍了热力系统组件对象模型的开发方法,COM思想大大提高了SIS软件模块通用性、灵活性、重用性和可扩展性。     

火电厂热力系统节能理论发展综述

介绍电厂热力系统节能理论的发展过程，分析比较各个时期的节能理论方法——常规热平衡计算方法、循环函数法、等效焓降法、偏微分法和以矩阵为核心的矩阵分析法，并指出热力系统分析方法的发展趋势。     

汽轮机及热装置性能评估系统研究

以某石化电厂双抽凝汽式汽轮机及热系统为研究对象,开发了以“热力参数诊断”为中心的旋转机械热力性能评估体系。通过对该汽轮机组运行性能和经济性能的计算分析,实时显示汽轮机组工作状态、当前热经济指标、当前工况下的节能潜力及热设备能损诊断结果,提出优化运行建议,并从热力学角度为电站设备的状态监测和预知性维修提供科学依据,实时指导汽轮机组经济运行。     

基于Labview技术的柴油机示功图采集系统设计

柴油机示功图含有与柴油机性能相关的丰富信息,它综合反映了柴油机热力转换过程和工作状态,结合其结构参数可以获得各缸平均指示压力、指示功和最高爆发压力等重要性能指标。虚拟仪器具有效率高,性能好,控制灵活,精度高等特点。为此以可视化的虚拟仪器系统Labview为开发平台,把传统仪器的所有功能模块集成在一台计算机中,设计了基于虚拟仪器的柴油机示功图采集系统,为柴油机性能监测与故障诊断提供了有效的技术手段。     

Malfunction diagnosis method for the thermal system of a power plant based on thermoeconomic analysis

It is difficult to accurately diagnose and locate faults in the thermal system of power plants due to the coupling of multiple components. The goal of the current study is to develop a model that predicts how the thermodynamic parameters–performance curve is changed when one component exhibits anomalies. This model uses the concept of irreversibility in thermoeconomic structure theory as a means of quantitatively measuring changes in the performance of power plant thermal systems. This is achieved by initially filtering out the effect of anomalies on the control regulation system and subsequently comparing the change in performance to reference values, enabling qualitative analysis to decouple component interactions. Following model construction, advanced process simulation is applied to simulate several typical fault conditions in a 330-MW power plant, and the proposed model is used to diagnose the cause of malfunction based on thermoeconomic analysis. The results indicate that the method has satisfactory feasibility for malfunction diagnosis in a complex energy system.     

Implementation of on-line performance monitoring system at Seoincheon and Sinincheon combined cycle power plant

As a result of the restructuring of the Korean Power Generation Industry, Korean power companies are under increased pressure to increase capacity and lower operating costs. In order to achieve these goals, an on-line real-time performance monitoring system has been introduced to the Seoincheon and Sinincheon combined cycle power plants (CCPP). The on-line real-time performance monitoring and optimization system helps plant personnel operate the plants profitably by tracking plant performance changes based on real-time information. This paper outlines how the on-line performance monitoring system is being used to improve the operational efficiency and optimize equipment maintenance. Case studies showing the benefits provided by the system are presented. This system will be useful for the plants to respond to the competitive electricity market.     

Real time reliability monitoring of hydro‐power plant by combined cognitive decision‐making technique

Hydro power plants are one of the most cost‐effective renewable technologies which have the potential to replace the conventional fuels. However, reliability of the plant varies with time due to irregularity in flow pattern of the river which depends on the pattern of climatic parameters like precipitation and evapo‐transpiration. The reliability of the plant performance also varies with the efficiency of the power equipment and conveyance coefficient of penstock, both of which are time dependent. When reliability reduces, performance efficiency also gets degraded. That is why, monitoring of reliability in hydro power plants is essential and required to be conducted periodically. But at present, such activities are expensive due to the requirement of extensive surveys, data collection and performance audits of the equipment and structures involved in the power production. There is a lack of single indicator based real time monitoring processes which can be utilized to continuously regulate the reliability of the power plant. Such system can reduce both cost and time required for conducting reliability assessment procedures. That is why, in the present study, an objective and cognitive technique was utilized to develop a single index for real time monitoring of the reliability of a power plant. The results indicate that efficiency of generator, levelized cost of electricity and rate of selling per unit electricity are the most significant indicator which have the capability to represent reliability. A model developed for the present study by Polynomial Neural Network also ensures that regular monitoring of reliability of an HPP is possible.     

一种新型的电站热力系统矩阵模型及其应用

本文提出了一个新型的电站热力系统矩阵模型,该模型综合考虑了回热系统和各个辅助系统的对象特征,物理概念简单易懂,模型采用热平衡方法,算法可靠,通用性强。在计算机软件实施中可以使用组态的思想,有突出的优点,能够提高电站性能监测软件的健壮性与可移植性,在电站性能分析领域具有广阔的应用前景。     

200MW机组运行性能诊断的热经济学方法

在热经济学结构理论的基础上,讨论了热力系统运行性能诊断的热经济学方法,以200MW机组热力系统的计算模型为例,阐述了各部件及产品关系,建立了系统的热经济学生产模型,并对故障诊断的方法、故障引起的系统资源消耗增量进行了理论分析和实际计算,提出了具有较高灵敏度的故障判别指标,以及反映故障影响的量化指标,并针对具体算例进行了分析计算。     

Potential of performance improvement of concentrated solar power plants by optimizing the parabolic trough receiver

This paper proposes a comprehensive thermodynamic and economic model to predict and compare the performance of concentrated solar power plants with traditional and novel receivers with different configurations involving operating temperatures and locations. The simulation results reveal that power plants with novel receivers exhibit a superior thermodynamic and economic performance compared with traditional receivers. The annual electricity productions of power plants with novel receivers in Phoenix, Sevilla, and Tuotuohe are 8.5%, 10.5%, and 14.4% higher than those with traditional receivers at the outlet temperature of 550°C. The levelized cost of electricity of power plants with double-selective-coated receivers can be decreased by 6.9%, 8.5%, and 11.6%. In Phoenix, the optimal operating temperature of the power plants is improved from 500°C to 560°C by employing a novel receiver. Furthermore, the sensitivity analysis of the receiver heat loss, solar absorption, and freeze protection temperature is also conducted to analyze the general rule of influence of the receiver performance on power plants performance. Solar absorption has a positive contribution to annual electricity productions, whereas heat loss and freeze protection temperature have a negative effect on electricity outputs. The results indicate that the novel receiver coupled with low melting temperature molten salt is the best configuration for improving the overall performance of the power plants.     

基于过程系统工程理论的热力系统性能模拟

在介绍了过程系统工程理论的基础上,采用过程系统工程理论的序贯模快法建立了电站汽轮机热力系统的过程单元模拟和系统模型,并采用回路断裂与收敛策略对热力系统进行了性能拟,验证了模型精度,最后分析了过程系统工程理论在电站过程系统性能模拟、分析、优化和诊断中应用的可行性与重要性。     

An Efficient Summer Operation Scheme for a Thermal Power Plant Air Cooling System based on Electric Peak Shaving

We proposed a novel efficient operation scheme for a thermal power plant’s air-cooling system based on peak shaving, in order to cope with high ambient temperature in summer. We introduced an absorptiongeneration equipment with water/lithium working pairs into the air cooled condenser(ACC) to reconstruct the traditional thermal power plant, and established a dynamic thermodynamic model adopting Ebsilon code. We studied the thermodynamic performance variation of the reconstructed thermal power plant throughout a 24-hour cycle and found that the fluctuation ratio of the turbine back pressure decreased to 6% from 78%, which is beneficial for the stable and safe operation of the electric power system. The thermal performance improvement benefited from the exploitation of the heat transfer potential of ACC, which realized via cold duty schedule throughout the day, under different ambient temperature conditions. In this system, the generated power was higher at relatively high ambient temperature than that at relatively low ambient temperature, which solved the electricity demand-supply imbalance problem under high ambient temperature. Finally, the same optimization effects for power thermal plants with an indirect air-cooling system were obtained using the same operation scheme.     

Comparative energetic and exergetic performance analyses for coal-fired thermal power plants in Turkey

The purpose of this study is to analyze comparatively the performance of nine thermal power plants under control governmental bodies in Turkey, from energetic and exergetic viewpoint. The considered power plants are mostly conventional reheat steam power plant fed by low quality coal. Firstly, thermodynamic models of the plants are developed based on first and second law of thermodynamics. Secondly, some energetic simulation results of the developed models are compared with the design values of the power plants in order to demonstrate the reliability. Thirdly, design point performance analyses based on energetic and exergetic performance criteria such as thermal efficiency, exergy efficiency, exergy loss, exergetic performance coefficient are performed for all considered plants in order to make comprehensive evaluations. Finally, by means of these analyses, the main sources of thermodynamic inefficiencies as well as reasonable comparison of each plant to others are identified and discussed. As a result, the outcomes of this study can provide a basis used for plant performance improvement for the considered coal-fired thermal power plants.