浅析陆水电厂机组增容改造的必要性

陆水电厂原采用ZZ105型水轮机,由于设计工况点偏离最优工况点及机组运行太久,致使机组效率降低、气蚀严重、绝缘老化.通过分析陆水电厂机组的现状,提出了机组增容改造的必要性,为机组增容改造提供参考.     

300MW循环流化床机组协调控制系统的研究与投运

随着东北网调两个细则考核的实施,电网对机组的快速响应提出更高的要求.要求机组在锅炉跟随协调方式下能快速的响应电网负荷并保证机组压力及各运行参数的稳定.本文主要介绍针对300MW机组的特点,对协调控制策略作一些优化改进,同时保证机组负荷的快速响应及机组本身各参数的稳定运行.     

浅谈武钢108机组锌铝镁镀层产线生产能力改造

文章聚焦武钢有限冷轧厂108机组改造后的铝锌镁机组,介绍了国内外的锌铝镁镀层产线发展现状,详述了改造后机组的工艺技术与主要设备功能参数,对机组技术特点进行了总结,提出了未来铝锌镁机组的主要发展方向为智能化、低成本、高表面质量。     

基于主控逻辑的风电机组叶片断裂原因分析

梳理了风电机组的运行流程,并阐述了主控系统与主控逻辑对风电机组安全运行的重要性,提出从主控逻辑是否完善的角度对机组叶片断裂事故进行原因分析.当排除叶片制造质量问题或风速超过限值、失速、电气故障或是否遭受雷击等外因后,可从机组主控系统控制逻辑出发,分析机组本身是否存在控制方面的重大安全隐患,结合机组的运行数据记录和控制系...     

浅谈1000MW机组发生RB后的安全运行

机组在正常运行过程中发生重要辅机跳闸造成机组实发功率受限时,严重威胁机组的安全,应该快速减负荷至相应值、如果RB动作将自动使机组负荷下降到运行辅机所能承受到的目标值,运行人员需要监视这个过程的执行情况,如果PB动作不正常,需人员手动调节,快速稳定机组运行。本文从以上两个方面讲述了1000MW机组重要辅机跳闸的处理要点。     

亚临界再热背压机组旁路容量选型的研究

结合某亚临界再热背压机组工程实际对再热背压机组的旁路系统设置进行研究,结果汇总：该机组旁路容量需考虑停机不停炉供热工况和机组回热系统需求,采用55%BMCR容量的高低压两级串联旁路系统,为再热背压机组旁路容量选型提供参考。     

石头河水库水电站1号机组改造方案研究

近年来,随着石头河水库功能及运行方式的变化,水库在高水位运行的工况时长增加,原有的坝后水电站1^#机组运行水头范围偏窄,造成机组年利用小时数低下,电站运行效益不能正常发挥。本文比较系统地介绍了在装机容量不变情况下,通过对机组的局部改造,实现了机组适用水头的提高,减小引水流量,提高机组效率,达到增加发电量的目的;对今后类似水电站机组改造技术研究和应用,特别是老电站机组改造,具有十分重要的参考价值。     

浅谈电液调节系统与液压调节系统的区别

汽轮机调节系统的基本任务是调整汽轮机的内功率,使之与外界负荷的变化相适应．是整台机组的神经中枢。对于扩建机组的司机人员,应熟悉掌握新机组和老机组在调节系统上的差别。     

超临界机组不同工况下无辅助蒸汽启动研究

以某超临界660MW机组为例,介绍了机组不同工况下无辅助蒸汽快速启动方法及注意事项,从而保证电厂黑启动情况下尽快恢复运行,提高机组的经济性,对国内同类型机组启动调整具有一定的借鉴意义。     

浅谈提高机组高、中压缸效率的方法

分析了哈汽NC135/110-13.24/0.98/0.324/535/535机组通过热力性能试验,找到机组高中压缸效率低问题原因,并通过机组专项检修、改造使机组安全经济运行达到设计水平.     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

The Reader Response Approach to Teaching of English Literature

During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context.