自动门
自动门:锅炉液位控制系统
发布时间:2014/3/10
自动门讯:
锅炉液位控制系统
锅炉是电厂和化工厂里常见的生产蒸汽的设备。为了保证锅炉正常运行,需要维持锅
炉液位为正常标准值。锅炉液位过低,易烧干锅而发生严重事故;锅炉液位过高,则易使蒸
汽带水并有溢出危险。因此,必须通过调节器严格控制锅炉液位的高低,以保证锅炉正常
安全地运行。
    当蒸汽的耗汽量与锅炉进水量相等时,液位保持为正常标准值。当锅炉的给水量不
变,而蒸汽负荷突然增加或减少时,液位赣会下降或上升;或者,当蒸汽负荷不变,而给水
管道水压发生变化时,引起锅炉液位发生变化。不论出现哪种情况,只要实际液位高度与
正常给定液位之间出现了偏差,调节器均应立即进行控制,去开大或关小给水阀门,使液
位恢复到给定值。
   锅炉为被控对象,其输出为被控参数液位,作用于锅炉上的扰动是指给水压力变化或蒸
汽负荷变化等产生的内外扰动;测量变送器为差压变送器,用来测量锅炉液位,并转变为一
定的信号输至调节器;调节器是锅炉液位控制系统中的控制器,有电动、气动等形式,在调
节器内将测量液位与绐定液位进行比较,得出偏差值,然后根据偏差情况按一定的控制律.
    分一微分(PID)等发出相应的输出信号去推动调节阀动作;调节阀在控制系统中起执行
元件作用,根据控制信号对锅炉的进水量进行调节,阀门的运动取决于阀门的特性,有的
阀门与输入信号或正比变化,有的阀门与输入信号呈某种曲线关系变化。大多数调节阀为
气动薄膜调节阀,若采用电动调节器,则调节器与气动调节阀之间应有电一气转换器。气动
调节阀的气动阀门分为气开与气关两种。气开阀指当调节器输出增加时,阀门开大;气关
阀指当调节器输出增加时,阀门反而关小。为了保证安全生产,蒸汽锅炉的给水调节阀一
般采用气关阀,一旦发生断气现象,阀门保持打开位置,以保证汽鼓不致烧予损坏。

成都市蜀盾自动门有限责任公司 Copyright @ 2018 www.shenkecs.com , All Rights Reserved
电话:028-8778 1123 手机:180 8682 3671
蜀ICP备10207201号
分享到:

SiteMap  手机用户请点此访问手机版
分分彩计划软件
  • http://www.hn1c.com/howuU/65390920.html
  • http://www.hn1c.com/howuU/28297.html
  • http://www.hn1c.com/howuU/3272974.html
  • http://www.hn1c.com/howuU/16857390.html
  • http://www.hn1c.com/howuU/9608598.html
  • http://www.hn1c.com/howuU/9348424.html
  • http://www.hn1c.com/howuU/71528.html
  • http://www.hn1c.com/howuU/43823572.html
  • http://www.hn1c.com/howuU/0039993.html
  • http://www.hn1c.com/howuU/61627533.html
  • http://www.hn1c.com/howuU/2747.html
  • http://www.hn1c.com/howuU/7756.html
  • http://www.hn1c.com/howuU/731515.html
  • http://www.hn1c.com/howuU/589593.html
  • http://www.hn1c.com/howuU/3914813.html
  • http://www.hn1c.com/howuU/82300.html
  • http://www.hn1c.com/howuU/4544282.html
  • http://www.hn1c.com/howuU/790292.html
  • http://www.hn1c.com/howuU/04837196.html
  • http://www.hn1c.com/howuU/50012794.html
  • http://www.hn1c.com/howuU/3789338.html
  • http://www.hn1c.com/howuU/3871754.html
  • http://www.hn1c.com/howuU/860890.html
  • http://www.hn1c.com/howuU/9367538.html
  • http://www.hn1c.com/howuU/8915.html
  • http://www.hn1c.com/howuU/998364.html
  • http://www.hn1c.com/howuU/36622767.html
  • http://www.hn1c.com/howuU/3599.html
  • http://www.hn1c.com/howuU/823680.html
  • http://www.hn1c.com/howuU/79822.html
  • http://www.hn1c.com/howuU/712773.html
  • http://www.hn1c.com/howuU/7796174.html
  • http://www.hn1c.com/howuU/786716.html
  • http://www.hn1c.com/howuU/7103088.html
  • http://www.hn1c.com/howuU/22813902.html
  • http://www.hn1c.com/howuU/0663.html
  • http://www.hn1c.com/howuU/06163305.html
  • http://www.hn1c.com/howuU/98895.html
  • http://www.hn1c.com/howuU/2282575.html
  • http://www.hn1c.com/howuU/5141720.html
  • http://www.hn1c.com/howuU/851229.html
  • http://www.hn1c.com/howuU/37026848.html
  • http://www.hn1c.com/howuU/8074.html
  • http://www.hn1c.com/howuU/16796.html
  • http://www.hn1c.com/howuU/06253.html
  • http://www.hn1c.com/howuU/91057.html
  • http://www.hn1c.com/howuU/5091.html
  • http://www.hn1c.com/howuU/45299.html
  • http://www.hn1c.com/howuU/15869750.html
  • http://www.hn1c.com/howuU/25490.html
  • http://www.hn1c.com/howuU/80316.html
  • http://www.hn1c.com/howuU/70235.html
  • http://www.hn1c.com/howuU/06328.html
  • http://www.hn1c.com/howuU/96827745.html
  • http://www.hn1c.com/howuU/43947.html
  • http://www.hn1c.com/howuU/8274.html
  • http://www.hn1c.com/howuU/3858.html
  • http://www.hn1c.com/howuU/56773614.html
  • http://www.hn1c.com/howuU/5512.html
  • http://www.hn1c.com/howuU/6592.html
  • http://www.hn1c.com/howuU/188322.html
  • http://www.hn1c.com/howuU/1904.html
  • http://www.hn1c.com/howuU/7206063.html
  • http://www.hn1c.com/howuU/54498.html
  • http://www.hn1c.com/howuU/6992894.html
  • http://www.hn1c.com/howuU/1471834.html
  • http://www.hn1c.com/howuU/49427129.html
  • http://www.hn1c.com/howuU/28054084.html
  • http://www.hn1c.com/howuU/3074.html
  • http://www.hn1c.com/howuU/06753.html
  • http://www.hn1c.com/howuU/6785.html
  • http://www.hn1c.com/howuU/957837.html
  • http://www.hn1c.com/howuU/4409.html
  • http://www.hn1c.com/howuU/60789016.html
  • http://www.hn1c.com/howuU/3183529.html
  • http://www.hn1c.com/howuU/9171659.html
  • http://www.hn1c.com/howuU/0001825.html
  • http://www.hn1c.com/howuU/6812.html
  • http://www.hn1c.com/howuU/863854.html
  • http://www.hn1c.com/akaAQ/35631613.html
  • http://www.hn1c.com/akaAQ/850499.html
  • http://www.hn1c.com/akaAQ/3316935.html
  • http://www.hn1c.com/akaAQ/573318.html
  • http://www.hn1c.com/akaAQ/3128759.html
  • http://www.hn1c.com/akaAQ/3804.html
  • http://www.hn1c.com/akaAQ/8074.html
  • http://www.hn1c.com/akaAQ/0778487.html
  • http://www.hn1c.com/akaAQ/45851829.html
  • http://www.hn1c.com/akaAQ/1214156.html
  • http://www.hn1c.com/akaAQ/92696.html
  • http://www.hn1c.com/akaAQ/09293.html
  • http://www.hn1c.com/akaAQ/69185212.html
  • http://www.hn1c.com/akaAQ/764352.html
  • http://www.hn1c.com/akaAQ/395643.html
  • http://www.hn1c.com/akaAQ/9464.html
  • http://www.hn1c.com/akaAQ/45215643.html
  • http://www.hn1c.com/akaAQ/61795291.html
  • http://www.hn1c.com/akaAQ/82865.html
  • http://www.hn1c.com/akaAQ/7341.html
  • http://www.hn1c.com/akaAQ/125908.html