基于人工神经网络的单轴联合循环机组变工况模拟

影响联合循环机组实际变工况性能的非线性因素众多,基于热力学基本原理的建模方法在准确性和计算量方面遇到了较大困难.前馈型神经网络以其良好的非线性逼近和预测能力在非线性建模领域获得了广泛应用.本文分别利用MATLAB神经网络工具箱中的BP、RBF和GRNN(广义回归)三种网络模型对GE的S109FA机组进行了变工况模拟,提出了评价网络性能的新标准并分析比较了三种模型的可行性,最后讨论相关结论.     

联合循环机组合理的变工况运行方式

讨论了联合循环机组在部分负荷下，燃气轮机的压气机采用可调静叶和汽轮机采用滑压运行，可以改善联合循环效率及提高汽轮机排汽干度，从而构成合理的变工况运行方式。文章最后讨论了由多台燃气轮机组成的联合循环中汽轮机的两种运行方式，并得出其中一种的运行方式为较好的结论。     

单轴燃气轮机联合循环机组热力性能试验的诊断

针对某公司电厂150MW单轴燃气蒸汽联合循环热电装置进行了热力性能诊断试验研究。在试验测量数据的基础上，应用ASPENPIMS软件对机组各部件作了详细计算，并提供了相应的计算结果和计算结果分析。     

PFBC联合循环中燃气轮机的变工况性能

本文以某增压流化床燃烧联合循环为例,建立了增压流化床锅炉及燃气轮机系统变工况性能计算的数学模型,并对ＰＦＢＣ系统中燃气轮机的变工况性能进行了分析。     

增压流化床联合循环商业示范电站变工况性能的研究

主要研究100MWe等级的PFBC商业示范电站偏离设计工况点和变工况运行的稳态性能，包括流化床锅炉内部变量在内的主要参数改变对电站性能的影响，蒸汽和燃汽部分对发电的分别贡献和相互匹配协调，以及负荷变化时预测系统能够达到的出力。     

压气机静叶可调对燃气轮机和联合循环变工况性能的影响

本文叙述了压气机采用可调静叶对单轴恒速燃气轮机变工况性能的影响。通过计算得到了燃气轮机变工况性能曲线,分析了不同的最大排气温度对静叶调节区的影响,以及在部分负荷下机组效率变化的影响。叙述了压气机静叶调节时对由单轴恒速燃气轮机组成的联合循环的影响,指出这时能改善部分负荷下的效率,因而得到了实际应用。     

燃气-蒸气联合循环的神经网络变工况模拟

燃气-蒸汽联合循环的变工况模型是多机组发电厂负荷优化的基础,而影响联合循环实际工况的非线性因素众多。依据热力学模型准确建模有较大困难。本文采用近代人工神经网络对GE的9F级燃气-蒸汽联合循环建立变工况模型,分析模型可行性和讨论相关结论。     

联合循环热电联供的变工况快速计算方法

本文在变工况分析和计算的基础上,建立了联合循环热电联供变工况性能的快速计算方法,可在现场方便地应用,以适时地确定系统运行工况的热力性能。     

联合循环电站变工况计算的实例应用

根据燃气轮机、余热锅炉和蒸汽轮机等关键部件的理论计算模型,以Corex煤气匹配的联合循环为例,对该联合循环进行额定工况及变工况计算,得出燃用Corex煤气选用的9E联合循环发电机组方式是合理、高效的,并指出燃机因燃料热值变化而导致机组变工况运行的调整和优化方法.     

补燃型不可逆联合循环热机的性能分析

在原有的不可逆联合动力循环模型的基础上,建立了一个存在热阻、热漏、补燃、内不可逆性的定常流联合卡诺热机循环模型。研究其在补燃作用下的功率和效率特性并对其进行优化,导出功率、效率的基本优化关系,分析了补燃对最优性能的影响。     

Performance analysis of a novel eco‐friendly internal combustion engine cycle

The Miller cycle applications have been performed to diminish NO_x released from internal combustion engines (ICEs), in recent years. The Miller cycle provides decreased compression ratio and enhanced expansion ratio; hereby, maximum in‐cylinder combustion temperatures diminish, and NO_x formations slow down remarkably. Another less‐known method is Takemura cycle application, which provides heat addition into engine cylinder at constant combustion temperatures. In this study, a novel cycle including the Miller cycle and the Takemura cycle has been developed by using novel numerical models and computing methods with seven processes and a novel way to decrease NO_x emissions at higher levels compared with the single applications of known cycles. A comprehensive performance examination of the proposed cycle engine in terms of performance characteristics such as effective power (EFP), effective power density (EFPD), exergy destruction (X), exergy efficiency (ε), and ecological coefficient of performance (ECOP) has been conducted. The impacts of engine operating and design parameters on the performance characteristics have been computationally examined. Furthermore, irreversibilities depending on incomplete combustion loss (INCL), exhaust output loss (EXOL), heat transfer loss (HTRL), and friction loss (FRL) have been considered in the performance simulations. The minimum exergy destruction and maximum performance specifications have been observed with 30 of the compression ratio. Maximum effective power values have been obtained at range between 1 and 1.2 of equivalence ratio. The optimum range for exergy efficiency is between 0.8 and 1 of equivalence ratio. Increasing engine speed has provided enhancing effective power. However, an optimum range has been found for the exergy efficiency that is interval of 3000 to 4000 rpm. The results obtained can be assessed by researchers studying on modeling of the engine systems and designs.     

9FA型燃气轮机联合循环性能研究

1引言西气东输工程促进了沿线燃气轮机联合循环电厂的建设,减轻了中东部地区的环境排放压力。燃气轮机联合循环发电系统高效低污染、启停迅速、调峰能力强。西气东输管道沿线有25台F级燃气轮机联合循环机组,其中GE公司9FA型燃气轮机联合循环发电机组13台。如何保证系统的稳定安     

联合循环机组"炉跳机"事故原因分析及技术改造

采用“二拖一”运行方式的联合循环机组,当一台余热锅炉出现故障而跳炉时,如不及时处理会引起汽轮机误跳,进而使另一台余热锅炉跳炉。这几年,镇海联合循环机组此类事故频发,影响了机组的稳定运行。本文介绍该厂针对此类汽轮机误跳现象,在确保主设备安全的前提下,对锅炉部分保护逻辑进行了修改,以减少汽轮机误跳几率,确保汽轮机稳定运行。     

联合循环参数和系统结构优化研究

研究了如何提高余热锅炉型三压再热联合循环系统的效率,应用分析的方法建立了系统效率数学模型,以联合循环系统效率最高作为系统性能的评判标准。在亚临界范围内,对余热锅炉的蒸汽参数进行了优化;针对余热锅炉进气温度对余热锅炉性能的影响进行分析,在此基础上提出燃气轮机排气部分回热利用,并研究了回热利用对联合循环效率的影响。计算结果表明:经余热锅炉优化和排气部分回热利用,在基本负荷下,PG9351FA机组的联合循环热效率可提高1.33%;在75%和50%的负荷下,效率分别提高2.11%和4.17%;而具有再热的GT26机组热效率高达60.73%。     

联合循环机组调节系统参数测试方法研究

发电机组参数测试试验是机组并网安全评定项目之一,为电网中长期稳定性分析提供了依据。本文在燃气轮机各部分控制系统分析的基础上,对某联合循环机组的调节系统建立模型,该模型说明,采用适当的方法可以进行联合循环机组的参数辨识。     

Performance optimisation for two classes of combined regenerative Brayton and inverse Brayton cycles

This paper proposes a new cyclic model of combined regenerative Brayton and inverse Brayton cycles. The new combined regenerative Brayton and inverse Brayton cycles recover heat energy after the working fluid leaves the turbine of the inverse Brayton cycle while the original combined regenerative Brayton and inverse Brayton cycles recover heat energy before the working fluid enters the turbine of the inverse Brayton cycle. Performance analysis and optimisation of the two classes combined cycles are carried out. Furthermore, the effect of the regenerator on the performance of the two combined cycles is analysed. It is found that the new combined cycle can obtain higher thermal efficiency and larger specific work than those of the original combined cycle at low compressor pressure ratio of the top cycle, and the regenerator can improve the performance of both the combined cycles. By theoretical analysis of this paper, it reveals that the new combined cycle will be well applied in the prospect, and the original combined cycle will be suited to low power output equipments. This paper aims at enriching the gas turbine theory and providing a possible way to save energy.     

燃气-蒸汽联合循环电站机组配置及选型分析

对联合循环电站燃气轮机选型、蒸汽系统的选择、余热锅炉和汽轮机选型、机组轴系配置、动力岛布置、主要辅助设备的选择等方面进行了分析研究,为联合循环电站的设计和研究方向提供了建议。     

Performance study of a partial gasification pressurized combustion topping gas cycle and split rankine combined cycle: Part I— Energy analysis

The aim of this paper is to study the thermodynamic performance of a new combination of a partial gasification pressurized combustion topping gas cycle and a split Rankine bottoming steam cycle as a means of advanced clean coal power generation. Energy analysis of the conceptualized power cycle is presented in this part of the paper. The effects of design and operating parameters of both the gas and the steam cycles on the performance of the power cycle are discussed. Copyright © 2003 John Wiley & Sons, Ltd.