200MW汽轮机轴承箱稳定性分析与改进

针对２００ＭＷ机组双死点机组在电厂投运中发生轴承箱失稳现象，对２００ＭＷ机组轴承箱在起动，停机状态的受力情况进行了分析，并对提高轴承箱稳定性做了改进工作，经电厂长期运行检验，证明是行之有效的。     

凝汽器冷却水管材质选择的讨论

目前火电厂内凝汽器冷却器水管的材质绝大部分仍是黄铜管，这给电厂的安全运行带来隐患，该分析了铜管漏泄，损坏的原因，并介绍了一些电厂改用不锈钢后的情况，建议在初设中应根据水源水质情况，从电厂长期安全运行出发，合理选择冷却水管材质。     

超临界机组旁路系统选型和控制

介绍了超临界机组旁路系统的种类、功能,列举了一些超临界旁路的应用情况,描述了旁路控制回路和保护功能,提出系统设计和运行中需要注意的要点和问题,供电厂在旁路系统选型及设计时做参考。     

燃煤电厂脱硫装置投产效益的实例分析

新建燃煤电厂同步建设石灰石-石膏湿法脱硫装置，与主机同步投产，将产生较好的社会效益和经济效益。对某电厂脱硫投产当年创造的环保效益和经济收益进行了分析估算，同时围绕脱硫装置投入运行所产生的经济效益进行了探讨并提出一些建议。     

对自备电厂管理的若干问题探讨

近年来电力紧缺,一些用电企业建了一批中小型机组的自备电厂,由于数量较多,缺乏有效管理,并网运行后影响到电力系统的安全经济。为此,本文对自备电厂作了分类及要求,以便于界定;并提出了关于自备电厂建设和加强对自备电厂管理的一些建议、要求和措施。     

变压器经济运行的研究及应用

介绍了大庆油田热电厂根据变压器负荷变化情况，调整变压器运行方式，提高变压器运行效率，降低发电成本的方法，通过调整使变压器运行更为经济合理，可供电厂进行变压器经济运行方式调整上做参考。     

循环流化床锅炉运行浅见

CFB锅炉是近年才发展起来的新型洁净煤燃烧技术。从高坝电厂和国内其它CFB锅炉的运行过程中，发现了一些故障和缺陷。结合自身的运行和调试经验，对故障原因作出了分析，提出了解决措施，为CFB锅炉的运行和CFB锅炉的大型化设计提供借鉴和参考。     

汽轮机液压调节系统稳定性的改进

过去许多电厂对于调节系统信号第一级传递和放大机构－调速器滑阀及执行机构－油动机的改造都很重视，并且也取得了可观的效果，现在越来越多的电厂对中间滑阀在运行中的卡涩问题，影响调节系统正常运行有所认识，对其性能的改进也越来越迫切了，针对电厂的实际要求，改进了中间滑阀，改造后的中间滑阀在系统性能试验及电厂的运行实践中证明了对于提高汽轮机液压调节系统的稳定性有明显的效果。     

新型低NOx轴向旋流燃烧器在某电厂的应用

本文主要介绍新型低NOx轴向旋流燃烧器的设计原理介绍,并对新型燃烧器在电厂的首次应有进行相应的燃烧调整做了详细介绍,在本文最后对于某电厂1#机组的运行提出了建议.     

能量系统的Yong经济学分析通用模型及其在电厂中的应用

在电厂的运行中，一些主要参数经常偏离设计值，如何研究这些偏离对整个机组经济性的影响，是进行电厂经济分析一项基础性工作。本文根据热经济学最前沿的理论，西班牙学才Ｖａｌｅｒｏ提出的“符号Ｙｏｎｇ经济学”，建立了能量系统的Ｙｏｎｇ经济学分析模型，并将其运用于国产２００ＭＷＱ机组，取得了满意效果。     

On identical problems of natural convection in enclosures and applications of the identity character

In this paper, a concept of "identical problems" of natural convection in enclosures is presented. A pair of problems of natural convection in enclosures is said to be identical if they look different in appearance but with appropriate selection of coordinates and appropriate definition of dimensionless variables for each problem, they will have identical geometric configurations and identical dimensionless governing equations and related boundary conditions. The identical characteristics of a pair of problems of natural convection in enclosures with an internal isolated island are demonstrated via dimensionless mathematical formulation and flow visualization results. Numerical computations are performed and the predicted streamlines agree with the flow visualization results. A number of other possible pairs of identical problems are also presented. Applications of the identical character are provided and assumptions under which the identical problems may exist are discussed.     

Analysis of contact problems of porous thermoelastic solids

In this article, we study a contact problem between a one-dimensional porous thermoelastic layer and a rigid obstacle. The mechanical problem consists of a coupled system of two hyperbolic partial differential equations and a parabolic one. By defining penalized problems, an energy decay property is obtained. Then, fully discrete algorithms are introduced to approximate both penalized and Signorini problems using the finite element method and the implicit Euler scheme. Stability properties are shown for both problems and a priori error estimates are proved for the penalized problem, from which the linear convergence of the algorithm is derived. Finally, some numerical simulations are performed to demonstrate the accuracy of the approximation and the behavior of the solution.     

CFB锅炉的循环倍率

循环倍率是ＣＦＢ锅炉设计和运行的重要参数，但目前并存着两种不同的定义。本文分析了两种不同定义的循环倍率之间的数值关系，指出两种定义并存可能造成的问题，并对如何取舍提出了建议。     

农村配电网发展存在的问题及解决措施

农村电网是中国电网中不可忽视的组成部分,由于农村的经济发展水平较为落后,在电网发展建设过程中存在着一定的问题,需要采取有效的措施加以解决,才能够确保农村近七亿人口的用电问题。以此为中心,结合工作经验,对当前农村配电网发展中存在的问题和解决措施进行分析论述。     

Robust and Optimal Control Problems to a Phase-Field Model for the Solidification of a Binary Alloy with a Constant Temperature

In this paper, we consider robust control problems which are governed by a two-dimensional phase-field model of Warren—Boettinger, which describes the solidification of a binary alloy, in order to take into account the influence of noises in the data. Firstly, the robust control problems are formulated. Afterwards, the existence and uniqueness of the solution of the perturbation (of the nonlinear governing system of equations) is proved as well as stability under mild assumptions. We prove the existence of an optimal solution, and we also find necessary optimality conditions.     

蒙特卡罗法求解湖库未确知水环境容量

针时未确知数学处理湖泊水库水环境系统众多不确定性信息中对未确知变量数、可能值区间分段数及采用的运算算子要求较高限制了未确知数学理论广泛应用的问题,提出用蒙特卡罗法模拟未确知数的可信度分布,根据满足可信度分布的未确知教试验值可直接进行未确知数运算.湖库水环境容量计算实例结果表明,该方案可行有效,计算结果可靠,对未确知数学在各学科领域广泛应用具有一定的推动价值.     

电除尘器效率降低原因分析及对策

电除尘器的应用越来越广泛,在粉尘治理领域发挥着极其重要的作用,但在使用中由于各种原因导致除尘效率降低,严重影响到电除尘器的正常工作,本文主要研究影响电除尘器效率降低的原因并提出对策,对电厂解决同类问题具有一定的借鉴意义。     

上犹县城区堤防工程地质问题及防治对策

以江西省上犹县山区城市堤防工程为例,通过现场钻探与工程地质调查,并运用工程地质分析原理分析了该堤防主要存在软土地基、堤基渗透稳定、崩岸塌坡等工程地质问题,通过工程地质方案比选,软土地基问题建议采用换土垫层法或抛石挤淤法进行处理,堤基渗透稳定问题采用堤内填塘压浸方法进行处理,崩岸塌坡采用干砌石护岸进行处理,对山区城市的堤防工程建设具有一定的借鉴和指导意义。     

General Solutions for Three-Dimensional Thermoelasticity of Two-Dimensional Hexagonal Quasicrystals and an Application

By introducing four displacement functions, the governing equations of the three-dimensional thermoelasticity of two-dimensional hexagonal quasicrystals are decoupled into two uncorrelated problems. Two higher-order displacement functions are introduced to represent the general solutions, which are eighth-order and fourth-order, respectively, for the two problems. By taking a decomposition and superposition procedure, the general solutions are further simplified in seven cases in terms of six quasi-harmonic displacement functions. To show the application of the general solutions obtained, a closed form solution is obtained for an infinite space containing a penny-shaped crack, subjected to a uniformly distributed temperature at the crack surface.