基于Ovation的再热汽温检测控制系统

基于Ovation的再热汽温检测控制系统 I 摘 要 本次毕业设计(论文)的题目是铁岭电厂300MW机组再热汽温控制系统设计。通过对机组的再热汽温控制系统进行现场实地观察、原理分析、可靠性论证，从而提出保证该系统长期稳定处于协调控制的方案。 在大型机组中，新蒸汽在汽轮机高压缸内膨胀做功后，需再送回到锅炉再热器中加热升温，然后再送入汽轮机中、低压缸继续做功。采取蒸汽中间再热可以提高电厂循环热效率，降低汽轮机末端叶片的蒸汽湿度，减少汽耗等。为了提高电厂的热经济性，大型火力发电机组广泛采用了蒸汽中间再热技术。 再热蒸汽温度控制的意义与过热蒸汽温度控制一样，是为了保证再热器、汽轮机等热力设备的安全，发挥机组的运行效率，提高电厂的经济性。再热蒸汽温度控制的任务，是保持再热器出口蒸汽温度在动态过程中处于允许的范围内，稳态时等于给定值。 在再热蒸汽温度控制中，由于蒸汽负荷是由用户决定的，所以几乎都采用改变烟气流量作为主要控制手段，例如改变再循环烟气流量，改变尾部烟道通过再热器的烟气分流量或改变燃烧器（火嘴）的倾斜角度。

关键词 再热汽温，过热蒸汽，串级 沈阳工程学院毕业设计（论文）

II Abstract This graduation project (paper) is through the hot steam warm control system carries on the principle analysis, the reliable proof, the scene again to the TieLing three electricity 300MW units on the spot observes, guarantee this system which proposed long-term stability is in the coordination control the plan. In the large-scale unit, the new steam inflates the acting after the steam turbine high pressure cylinder, must again return to the boiler reheater in heats up elevates temperature, then sees somebody off again in the steam turbine, the low pressure cylinder continues the acting. Adopts among the steam hot to be possible to enhance the power plant circulation thermal efficiency again, reduces the steam turbine terminal leaf blade the steam humidity, reduces the steam consumption and so on. In order to enhance the power plant the hot efficiency, the large-scale thermoelectricity generation unit has widely used among the steam again the hot technology. Again the hot vapor temperature control significance and the superheat vapor temperature control is same, is in order to guarantee thermal energy equipment and so on reheater, steam turbine securities, the display unit's operating efficiency, enhances the power plant the efficiency. Again the hot vapor temperature control duty, is maintains the reheater to export the vapor temperature to be in the permission in the dynamic process in the scope, when stable state is equal to the given value. In again hot vapor temperature control, because the steam load is by the user decision, therefore nearly all uses the change haze current capacity to take the primary control method, for example the change circulates again the haze current capacity, the change rear part flue or changes the burner through the reheater haze divergence quantity (spout) the angle of tilt.

Keywords reheat steam，superheat steam，cascade 基于Ovation的再热汽温检测控制系统

III 目录 摘 要 ................................................................................................................................................ I ABSTRACT ....................................................................................................................................... II 1 引言 ............................................................................................................................................. 1 1.1 设计课题的目的、意义 .................................................................................................. 1 1.2 国内外现状及发展趋势 .................................................................................................. 1 1.2.1 国内背景 ............................................................................................................... 1 1.2.2 国内现状及发展趋势 ........................................................................................... 2 2 OVATION介绍 ........................................................................................................................... 3 2.1 西屋OVATION介绍 ...................................................................................................... 3 2.2 OVATION控制系统的特点 ............................................................................................ 3 3火力发电厂发电工艺简介 .......................................................................................................... 5 3.1 火力发电厂概述 .............................................................................................................. 5 3.1.1 火力发电厂基本原理 ........................................................................................... 5 3.1.2 主要生产过程简述 ............................................................................................... 5 3.2 火电厂三大控制系统 ...................................................................................................... 6 3.2.1 锅炉给水控制系统 ............................................................................................... 6 3.2.2 过热蒸汽温度控制系统 ....................................................................................... 7 3.2.3 再热蒸汽温度控制系 ........................................................................................... 7 4再热蒸汽温度检测控制系统 ...................................................................................................... 8 4.1 火电厂再热汽温检测控制系统概述 .............................................................................. 8 4.1.1 再热蒸汽温度检测控制的意义与任务 ............................................................... 8 4.1.2 再热蒸汽的特点 ................................................................................................... 8 4.1.3 再热蒸汽温度的影响因素 ................................................................................... 9 4.1.4 再热蒸汽温度控制的方法手段 ........................................................................... 9 4.2 基于OVATION的300MW机组再热汽温检测控制系统设计概述 ........................ 15 4.3 基于OVATION的300MW机组再热汽温检测控制系统SAMA图设计说明 ....... 16 4.3.1 摆动燃烧器控制系统 ......................................................................................... 16 4.3.2 喷水减温控制系统 ............................................................................................. 18 5 再热汽温检测控制系统中的器件介绍 ................................................................................... 21 5.1 温度变送器 .................................................................................................................... 21 5.2 燃烧器摆角执行器 ........................................................................................................ 22 结论 ............................................................................................................................................... 23 致谢 ............................................................................................................................................... 24 参考文献 ....................................................................................................................................... 25 附录A1.1 ...................................................................................................................................... 26 附录A1.2 ...................................................................................................................................... 27 附录A1.3 ...................................................................................................................................... 28