机组

This article mainly introduced DEH system' s appliance on two 300MW units in Datang Leiyang Power Plant.

本文主要介绍大唐耒阳电厂2×300 MW机组的 DEH系统自投产运行以来在运行状况良好的同时存在的一些问题以及相应的故障处理方法。

Due to the problems of homemade DEH, generating unit can' t run safely and stably.

一些国产DEH装置由于种种原因，不能正常投运，直接影响机组的安全稳定运行。

Along with the fast development of the power system,DEH becomes the essential control system for stream turbines,especially for large stream turbines.

随着电力系统的飞速发展，电网正在向电压高、距离远、容量大的方向发展，单元机组的运行方式也更趋复杂。

Therefore, it is essential to analyze the dynamic characteristics and to optimize the parameter of DEH control system of reheat extraction steam turbine, which would do benefit to design the control system with excellent performance and to guarantee the safety of the turbines.

全面掌握中间再热抽汽式汽轮机控制系统的动态特性，优化控制器的参数，是设计性能优良的控制系统，保证机组安全运行的关键，具有重要的工程应用背景。

Aiming at large-size steam turbine DEH governing system is complex and difficult to evaluate their conditions, a method of variable weight synthesizing condition evaluation of DEH system is firstly proposed on the basis of analysis on the condition effecting factors of DEH system.

针对大型汽轮机组数字式电液调节系统复杂，难以评价状态的问题，在分析反映系统运行状态各因素的基础上，首次提出了基于变权综合的数字式电液调节系统状态评价方法。

600MW unit is occupying the more and more important status in domestic power system, meanwhile, the simulation models of DEH introduced in this article can be used as a platform for optimizing operation, enhancing performance and diagnosing faults etc, which will certainly to promote DEH widespread utilization as well as the steam turbine control.

600MW机组正在国内电力系统中占据越来越重要的地位，本文开发的数字式电液调节系统仿真模型为电站的生产运行、性能分析和故障诊断提供了一个研究平台，这必将促进数字式电液调节系统的广泛运用以及汽轮机控制水平的提高。

Now there are many sets in electric power system which adopt high-performance zinc oxide resistance for rotor demagnetization and over-voltage protection,and have good practical effects.

目前，系统内已有许多机组采用高性能氧化锌电阻作为转子灭磁电阻和过电压保护，具有良好的实用效果。

Methods: The density function theory and CBS methods were used.

应用密度泛函理论和完全机组算法理论计算。

So the proposed method in this dissertation not only meet the requirements for fossil-fuel unit set in GB/T 12145-1999, but also can effectively restrain condensate and feed water system corrosion. Thereby the proposed method can reduce the loss by corrosion's leading accident, lower Fe content in boiler feed water, slow the boiler's scaling speed, delay boiler's chemical cleaning interval, effectively enhance unit's reliability, usability and using life and solve the problem of poisonous chemical deoxidant. So the proposed method can economize substantial expense for power plant.

所以，本文所提出的汽包炉有限氧化性水化学工况不但能满足GB/T12145-1999中对火力发电机组及蒸汽动力设备的要求，而且可有效抑制凝结水和给水系统的腐蚀，减少因这些部位腐蚀损坏而引发的事故停机损失，降低锅炉给水中的金属含量，减轻炉内的结垢速度，延长锅炉的酸洗间隔，有效提高机组的可靠性、可用率和使用寿命，同时也解决了有毒化学除氧剂的使用问题，为电厂节省大笔运行费用。

Based on the structural matrix of thermody-namic system,a calculation model for the influence of extraction steam pressure loss on thermal economy of unit was derived by strict deduction and demonstration.

基于热力系统结构矩阵，通过严密的数学推导，给出了定流量条件下抽汽压损对机组热经济性影响的计算模型。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。