基于可分离热电燃气轮机模型的电-气-热联合系统调度运行研究

在电-气-热综合能源系统(Intergrated Power、Gas and Heat Energy Systems,IPGHES)中,利用电力、热力和天然气的互补特性可以提高综合能源中可再生能源的消纳能力.电力系统、热力系统和天然气系统通过热电联产、电转气等设备互相耦合,文中采用可分离热电燃气轮机模型并计及了电转气技...     

热力系统广义q-γ-τ矩阵方程式及其应用

热力系统q-γ-τ矩阵方程式是电厂热力系统定量分析方法的一个重要分支。广义q-γ-τ矩阵方程式将锅炉的过热器视为一个特殊加热器,较好地解决了常规q-γ-τ矩阵方程式对减温喷水影响锅炉内部流量变化的特殊辅助汽水考虑不足的问题,是常规q-γ-τ矩阵方程式有效的延伸和补充。对所述方法通过实例进行了验证。     

电-热综合能源系统能流的区间计算算法

为描述电、热负荷不确定性对综合能源系统的影响,建立了电-热综合能源系统区间能流模型。首先,计及电-热综合能源系统负荷的不确定性,分别建立了电力网络区间模型和热力网络区间模型。然后,考虑热电联产机组、水泵和热泵建立了一种更符合实际情况的电热耦合元件区间模型。最终,通过电热耦合元件实现了电力网络和热力网络的耦合,建立了电-热综合能源系统区间能流模型。针对传统的区间迭代法存在的计算结果区间易于扩张的问题,采用基于区间扩展的迭代算法对电-热综合能源系统区间能流模型进行求解。对IEEE33节点系统和32节点热力系统构成的电-热综合系统进行算例分析,结果验证了所建区间模型和所提算法的正确性。     

计及相关性的电-气-热综合能源系统概率最优能量流

由电力系统、天然气系统和热力系统耦合构成的综合能源系统(IES)是"能源互联网"的重要组成部分,是构建更加经济、环保、高效能源系统的必经之路。该文提出了一种计及相关性的电-气-热IES概率最优能量流计算方法。首先,以IES运行成本为优化目标,综合考虑电力系统、天然气系统、热力系统的运行约束及能量耦合约束,建立了IES最优能量流模型;针对IES中风电接入背景下的不确定性因素,并考虑其相关性,建立IES概率最优能量流模型,并采用基于Nataf变换的三点估计法对该模型进行求解。对由修改的IEEE 24节点电力系统、比利时20节点天然气系统和巴里岛32节点热力系统构成的IES进行仿真分析,仿真结果验证了该文所建立模型的可行性与有效性。     

苏联K-500-240-2型超临界机组的热力系统

扼要介绍了目前国内外500MW 级及以上容量机组热力系统设计中具有代表性的K-500-240-2机组热系统设计概貌.包括:机、炉参数.给水予热系统、除氧、抽真空、除盐、给水泵组、主要汽水管道、热网加热系统及机组的起动系统等.     

燃气-蒸汽联合循环余热锅炉及其影响因素分析

以燃气-蒸汽联合循环中起承上启下重要作用的余热锅炉为研究对象,从总体上介绍了余热锅炉各种型式,论述了余热锅炉的热力特点,并分析了余热锅炉的各种影响因素。     

永安火电厂N100-90/535型汽轮机组节能技术改造

一、前言永安火电厂5号机系北京重型电机厂制造的N100-90/535型汽轮机(第19台产品),1984年10月投产发电。为了了解该机的热力特性,1991年6月5号机大修前作了热力试验。计算结果表明5号机的热效率低于设计值。通过分析并应用该厂6号机组(同     

基于热经济学的热力系统主蒸汽压力-排汽压力联合优化

为提升机组参与调峰时的热经济性,确定不同工况下热力系统发电成本,提出一种热力系统主蒸汽压力-排汽压力联合优化热经济学模型。该模型在算法设计中采用内外3层的迭代循环逻辑,从机理层面分析热力系统各参数间耦合关系,获得参数扰动后系统全部汽水参数和各级组通流量校正值。应用该数据完成热经济学指标计算与系统优化。获得不同负荷不同环境温度条件下主蒸汽压力与凝汽器真空的联合优化解。对比计算结果得出:主蒸汽压力与排汽压力联合优化解优于主蒸汽压力单独优化解;热力系统的发电成本随负荷的升高而减小、随环境温度的升高而增大;热力系统在冬季经济性更好。建议火电机组在制定上网电价时考虑季节因素对系统发电成本的影响。     

某“三拖一”燃气-蒸汽联合循环电站性能试验分析

基于某"三拖一"燃气-蒸汽联合循环电站项目,对其进行热力性能考核试验,其考核项目为轻柴油和天然气两个工况的机组净输出功率和热耗率,文章阐述了该试验的试验标准、试验过程、边界划分、测点布置以及计算修正方法,并对试验中存在的一些问题进行总结,为大型"多拖一"联合循环机组热力性能考核试验提供技术支持。     

输电塔钢管-板连接节点焊接数值模拟

为了了解焊接过程中高度集中的瞬时热输入产生较大的动态应力及焊后将产生相当大的焊接残余应力和残余变形,笔者利用大型有限元软件ANSYS,建立钢管-板连接节点的有限元模型,采用热力耦合分析方法对钢管-板连接节点进行了焊接数值模拟,获得了焊接温度场及残余应力场的分布规律,为提升焊接质量提供了参考依据.     

The T-125/150-12.8 cogeneration steam turbine

The article presents the design, the economic indicators, and the main solutions on the thermal process circuit and layout of the T-125/150-12.8 turbine, a new design version of the T-100-12.8 turbine, which is one of the best known, unique and widely used cogeneration turbines in Russia and abroad. The project of the new turbine is supposed to be used both for renovating and upgrading already installed turbines of the T-100 family and for supplying it as a full set for replacing obsolete equipment or constructing new one.     

国产125MW汽轮机改造后调节级的损失分析

从国产N125-13．24／550／550型汽轮机改造为N137．5—13．24／535／535型冲动式和反动式的2种改造方案出发，针对各种损失的产生机理，从结构参数、热力参数、不均匀流场方面对125MW汽轮机改造后的冲动式、反动式2种方案的调节级进行了比较分析。改造结果表明：冲动式的整体热力性能低于反动式。文中还对优化设计提了建议。     

Investigation and adjustment of the pilot power unit equipped with a K-300-170-1R turbine produced by OAO Silovye Mashiny

Results obtained from investigations and adjustment works on a K-300-170-1R steam turbine carried out concurrently with a comprehensive set of works (adjustment of the support and suspension system of pipelines, analysis of thermal expansions of the cylinders and operating conditions of the bearings, optimization of the steam admission system, balancing works, and others) aimed at improving the turbine unit vibration performance are presented. The use of such integrated approach makes it possible to efficiently settle matters concerned with removing increased vibration of a turbine unit.     

Calculation of thermal displacements for selecting gaps in the flow path of a T-40/50-8.8 turbine

The temperature fields and distributions of thermal displacements of the rotor and stator of a T-40/50-8.8 turbine are calculated for selecting the axial erection and working gaps between the diaphragm and rotor in each turbine stage in designing the flow path of this turbine and drawing up its theoretical drawing.     

Substantiation of the cogeneration turbine unit selection for reconstruction of power units with a T-250/300-23.5 turbine

The selection of a cogeneration steam turbine unit (STU) for the reconstruction of power units with a T-250/300-23.5 turbine is substantiated by the example of power unit no. 9 at the cogeneration power station no. 22 (TETs-22) of Mosenergo Company. Series T-250 steam turbines have been developed for combined heat and power generation. A total of 31 turbines were manufactured. By the end of 2015, the total operation time of prototype power units with the T-250/300-23.5 turbine exceeded 290000 hours. Considering the expiry of the service life, the decision was made that the reconstruction of the power unit at st. no. 9 of TETs-22 should be the first priority. The main issues that arose in developing this project—the customer’s requirements and the request for the reconstruction, the view on certain problems of Ural Turbine Works (UTZ) as the manufacturer of the main power unit equipment, and the opinions of other project parties—are examined. The decisions were made with account taken of the experience in operation of all Series T-250 turbines and the results of long-term discussions of pressing problems at scientific and technical councils, meetings, and negotiations. For the new power unit, the following parameters have been set: a live steam pressure of 23.5 MPa and live steam/reheat temperature of 565/565°C. Considering that the boiler equipment will be upgraded, the live steam flow is increased up to 1030 t/h. The reconstruction activities involving the replacement of the existing turbine with a new one will yield a service life of 250000 hours for turbine parts exposed to a temperature of 450°C or higher and 200000 hours for pipeline components. Hence, the decision has been made to reuse the arrangement of the existing turbine: a four-cylinder turbine unit comprising a high-pressure cylinder (HPC), two intermediate pressure cylinders (IPC-1 & 2), and a low-pressure cylinder (LPC). The flow path in the new turbine will have active blading in LPC and IPC-1. The information is also presented on the use of the existing foundations, the fact that the overall dimensions of the turbine unit compartment are not changed, the selection of the new turbine type, and the solutions adopted on the basis of this information as to LPC blading, steam admission type, issues associated with thermal displacements, etc.     

The design features of a K-110-1.6 bottom steam turbine

Design features of a bottom condensing turbine, fundamental principles of turbine control, and basic solutions for the thermal circuit and layout of the turbine unit are considered.     

百万千瓦级核电机组汽轮机的特点及选型原则

通过对百万千瓦级压水堆核电机组汽轮机特点的分析,论述了核电机组汽轮机转速的选择,重点介绍了半转速汽轮机的特点和投资成本,以及热力参数及通流面积等方面的选择原则。 对核电机组汽轮机与反应堆容量匹配,以及通流面积的匹配进行了论证,为核电机组汽轮机的选型设计及设备招标提供基本的参考依据。     

A T-113/145-12.8 cogeneration steam turbine for the PGU-410 combined-cycle plant at the Krasnodar cogeneration station

Turbine design, essential features of its control, economic indicators, and main solutions taken for the thermal circuit and layout of the T-113/145-12.8 turbine unit are considered.     

EXCEL迭代功能在热力计算中的应用

依据《ASMEPTC6—1996汽轮机性能试验规程,》提出了应用EXCEL迭代功能,无需编程进行热力计算的方法;该方法可简便适用于汽轮机性能试验计算和系统修正计算。     

K156-2型330MW汽轮机启动过程中汽缸、转子的热力分析

论述汽轮机本体部分在启动过程中的热力特性，对汽轮机组启动过程中的受热情况及其在启动过程中的热应力、热膨胀、热变形进行分析，以保证汽轮机组的安全运行。