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汽轮机培训课件(调节保安系统).ppt

  • 2026-06-20 16:20:30
汽轮机培训课件(调节保安系统).ppt

速关组件结构及原理简述

速关组件:是将调节系统中一些操作件集装在一起的液压件组合,它不仅使操作便捷,并且也使得油管路及电器线路的布置趋于合理、简化。

速关组件的作用:用于汽轮机速关阀的就地启动、就地停机、遥控停机及速关阀联机试验。

速关组件的工作原理:

(1)速关阀联机试验功能

试验阀2309,是手动换向阀,可对两只速关阀进行试验。

试验步骤:将手柄向操作侧拉动,压力油P便与试验油H1接通,即可对东侧速关阀进行试验;推动手柄则使压力油与试验油H2接通,即可对西侧速关阀进行试验。

由于在H1、H2油路上有节流孔,所以手动换向阀投入或退出试验的操作不会影响机组的正常运行。

(2)速关阀联机试验原理

1、原理:速关阀的油缸部分装有试验活塞,压力油经节流孔进入试验活塞右端腔室,由于试验活塞面积大于油缸活塞面积,因此当试验油压大于某一数值后,在油压力的作用下试验活塞推动油缸活塞、活塞盘、阀杆、阀碟同时向关闭方向移动,行程为h(约20mm),这一行程不影响机组的正常运行。

2、试验结果:

速关阀状况良好  P2<P1,若P2≥P1,则表明速关阀杆有盐垢或油垢沉积,导致阀杆增加了额外阻力,致使速关阀动作不正常。

其中P1为需用试验压力;

P2为试验活塞开始移动时的试验油压;

根据公式: P1=A+B(P4-0.1)(单位MPa)

其中 A、B是与规格有关的特性值,能够查到。(A=0.1893;B=0.724)其中P4是机组运行时的速关油压值

(3)速关组件实现速关阀的开启原理

当启动油压F达到≥0.6Mpa以上时,先让旋转手动阀1842 复位,即1842的P-A,B-T为通路,插装阀DG16开启,建立速关油E2,当速关油压≥0.6Mpa时,1843复位,即P油口阻断,B-T为通路,于是启动油开始回油,因为1843回油口装有节流孔板和可调节流针阀,启动油回油缓慢,并可调整,以控制速关阀开启速度,此时速关阀徐徐打开。在1843复位后,P油口阻断,通往2200的压力油被速关油取代控制2200中的充液阀,使插装阀保持常开状态。注意:在机组运行中,一旦速关油压降低,则充液阀回油口关闭,相应插装阀关闭,切断P-E2通路,致使速关阀关闭,机组停机。

(4)速关组件的遥控及手动停机

1、遥控停机:

   停机电磁阀2222、2223分别用于汽轮机的遥控停机,右图所示的电磁阀为不带电状态,正常运行或启动开车时为带电状态。

   启动或正常运行时,2222和2223为压力油的通路,此时电磁阀的P-B为通路,插装阀DG40在压力油的作用下关闭,当2222或2223的一只失电,即电磁阀的B-T通路打开,DG40上腔与回油口接通,于是DG40开启,速关油迅速泄放,速关阀关闭,实现停机。

2、手动停机:手动停机阀2250,用于汽轮机的手动停机,操作时将2250前方的一块红色护板向操作侧翻下,拉动手柄,结果与电磁阀失电一样,使汽轮机停机。 

1、油动机的结构:

(1)作用原理: 油动机是调节汽阀的执行机构,它通过电液转换器把电子调节器输送的4--20mA电信号转换为0.15--0.45Mpa的二次油,并通过单向节流阀由内部管路传给错油门。错油门将二次油压与弹簧设定值比较后,使错油门滑阀上行或下行,操纵油缸活塞移位,带动调节汽阀开大或关小,从而调节汽轮机进汽量,达到调整汽轮机运行的目的。

(2)结构组成:主要由油缸、错油门、连接体和反馈机构组成。如下图:

1、调节汽阀的结构:

(1)作用:调节汽阀的作用是按照控制单元的指令改变进入汽轮机的蒸汽流量,以使机组受控参数(功率或转速、进汽压力、背压等)符合运行要求。

(2)结构组成:主要由调节阀、传动机构和油动机三部分组成。

调节阀包括阀杆、阀梁、阀碟及阀座等。

传动机构由支架和杠杆组成。如图所示

(本文来自:电厂运行班,本号所刊发文章仅为学习交流之用,无商业用途,向原作者致敬。因某些文章转载多次无法找到原作者在此致歉,若有侵权请告知,我们将及时删除,本文仅供学习交流、我们注重分享,勿作商用,版权归原作者。)

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  1. CONNECT:[ UseTime:0.001035s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001449s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000556s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000529s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001380s ]
  6. SELECT * FROM `set` [ RunTime:0.000436s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001355s ]
  8. SELECT * FROM `article` WHERE `id` = 533986 LIMIT 1 [ RunTime:0.000862s ]
  9. UPDATE `article` SET `lasttime` = 1782421591 WHERE `id` = 533986 [ RunTime:0.013649s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000685s ]
  11. SELECT * FROM `article` WHERE `id` < 533986 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001342s ]
  12. SELECT * FROM `article` WHERE `id` > 533986 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.005153s ]
  13. SELECT * FROM `article` WHERE `id` < 533986 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001975s ]
  14. SELECT * FROM `article` WHERE `id` < 533986 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.030649s ]
  15. SELECT * FROM `article` WHERE `id` < 533986 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009595s ]
0.241239s