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1、300MW发电机组再热汽温控制系统设计摘要本次毕业设计(论文)的题目是铁岭电厂300MW机组再热气温控制系统设计。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
2、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。关键字再热汽温，过热蒸汽，串级I300MW发电机组再热汽温控制系统设计AbstractThisgraduationproject(paper)isthroughthehotsteamwarmcontrolsystemcarriesontheprin
3、cipleanalysis,thereliableproof,thesceneagaintotheTieLingthreeelectricity300MWunitsonthespotobserves,guaranteethissystemwhichproposedlong-termstabilityisinthecoordinationcontroltheplan.Inthelarge-scaleunit,thenewsteaminflatestheactingafterthesteamturbinehighpressurecylinder,mustagainretu
4、rntotheboilerreheaterinheatsupelevatestemperature,thenseessomebodyoffagaininthesteamturbine,thelowpressurecylindercontinuestheacting.Adoptsamongthesteamhottobepossibletoenhancethepowerplantcirculationthermalefficiencyagain,reducesthesteamturbineterminalleafbladethesteamhumidity,reducest
5、hesteamconsumptionandsoon.Inordertoenhancethepowerplantthehotefficiency,thelarge-scalethermoelectricitygenerationunithaswidelyusedamongthesteamagainthehottechnology.Againthehotvaportemperaturecontrolsignificanceandthesuperheatvaportemperaturecontrolissame,isinordertoguaranteethermalener
6、gyequipmentandsoonreheater,steamturbinesecurities,thedisplayunit'soperatingefficiency,enhancesthepowerplanttheefficiency.Againthehotvaportemperaturecontrolduty,ismaintainsthereheatertoexportthevaportemperaturetobeinthepermissioninthedynamicprocessinthescope,whenstablestateisequaltothegi
7、venvalue.Inagainhotvaportemperaturecontrol,becausethesteamloadisbytheuserdecision,thereforenearlyallusesthechangehazecurrentcapacitytotaketheprimarycontrolmethod,forexamplethechangecirculatesagainthehazecurrentcapacity,thechangerearpartflueorchangestheburnerthroughthereheaterha
