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安徽快3开奖结果 News
渣浆泵脱硫泵挡板的动作时间
添加时间:2019.11.04

渣浆泵脱硫泵挡板的动作时间
  隔离挡板从全开到全关,或者从全关到全开所需要的时间叫做动作时间。通常,用作旁路烟道的百叶窗挡板要求快开时间不超过25s,对快速动作的要求主要是保证当FGD故障紧急停运时,能快速开启旁路挡板门,以确保烟气经旁路烟道直接进入烟囱。百叶窗旁路挡板门关闭时的开度应具有分级可调性,以减少旁路门关闭时对锅沪炉膛负压的影响。FGD系统的其他百叶窗挡板门的动作时间一般在40s左右。
  闸板门打开和关闭时的运行速度一般为1.3~ 2m/min。大型机组口烟道的高度多在3m以上,门完全打开或者关闭需要2~3min。因此,它不能应用在旁路烟道中,主要用在系统口或吸收塔入口,仅作隔离之用。
  4.烟道沉积物对挡板门动作的影响
  烟道沉积物飞灰、吸收塔浆液中的固体物会积聚在烟道内,尤其是烟道的底部。因此必须考虑这些沉积物对挡板门动作的影响。
  对于通常的闸板式开关门,如系统或吸收塔口、出口隔离挡板门,其板片必须能挤掉这些沉积物插烟道。挡板驱动装置,如电动机应有足够的功率能使闸板插沉积物中。对于一个长期处于关闭状态的闸板门,驱动装置的执行器必须有足够的启动功率以克服板片和框之间的粘连。
  对于一个常开的百叶窗挡板门,如FGD、出口门,或常闭的百叶窗挡板门,如旁路隔挡板门,如果长期处于某一位置,烟道沉积物可能会使叶片难以动作。对于底部的叶片,这一问题尤为严重。其一,烟道底部是沉积物最多的区域;其二,如果其他叶片转动灵活,驱动器的整个扭矩都作用在底部叶片上,这可能损坏叶片和连接机构。因此,些百叶窗挡板配有两套驱动器和连接机构。套供最下面的叶片使用,另套供其他叶片使用。

另外,对于常闭的百叶窗挡板门,如果烟道积灰出现在挡板门的侧,叶片旋转方向应朝积灰的下游侧,避免积灰阻挡叶片转动。
    不论何种挡板门,最好的操作方式是定期将挡板广在其活动范围内动一动,以防挡板门长期不动作发生卡涩。对于常团的旁路挡板门尤其应该如此。
  烟道挡板的技术要求如下:(1)耐高温特性(2)耐化学腐蚀性能(酸腐蚀);(3)过压:(4)负压; 渣浆泵

Action time of baffle plate of desulfurization pump of slurry pump


The time required for the isolation baffle from full opening to full closing, or from full closing to full opening is called action time。 Generally, the fast opening time of the shutter damper used as the bypass flue is required to be no more than 25s, and the fast action is mainly required to ensure that the bypass damper door can be opened quickly when the FGD fails to shut down in an emergency, so as to ensure that the flue gas directly enters the chimney through the bypass flue。 The opening of the louver bypass damper shall be adjustable in stages to reduce the negative pressure of the boiler furnace when the bypass valve is closed。 The action time of other shutter door in FGD system is generally about 40s。


The operating speed of ram door when it is opened and closed is generally 1.3 ~ 2m / min. The height of the flue at the inlet of large units is more than 3m, and it takes 2-3min for the door to be fully opened or closed. Therefore, it can not be used in the bypass flue, mainly used in the system inlet or absorption tower inlet, only for isolation.


4. Effect of flue deposit on damper door action


The solid matter in the fly ash of flue deposit and slurry of absorption tower will accumulate in the flue, especially at the bottom of the flue. Therefore, it is necessary to consider the effect of these deposits on the operation of the damper door.


For the normal gate type door opening and closing, such as the inlet and outlet isolation damper doors of the system or absorption tower, the plates must be able to squeeze out these deposits and insert them into the flue。 The damper driving device, such as the motor, shall have enough power to insert the ram into the deposit。 For a long-term closed gate, the actuator of the driving device must have enough starting power to overcome the adhesion between the plate and the door frame。


安徽快3开奖结果For a normally open shutter door, such as FGD inlet and outlet door, or normally closed shutter door, such as bypass isolation damper door, if it is in a certain position for a long time, the flue deposit may make the blade difficult to operate. For the bottom blade, this problem is particularly serious. First, the bottom of the flue is the area with the most sediment; second, if other blades rotate flexibly, the whole torque of the driver acts on the bottom blades, which may damage the blades and the connecting mechanism. Therefore, some louver baffles are equipped with two sets of drivers and connecting mechanisms. One set is for the lowest blade and the other for other blades.




In addition, for the normally closed shutter baffle door, if the ash accumulation in the flue appears on one side of the baffle door, the rotation direction of the blade shall be toward the downstream side of the ash accumulation to avoid the ash accumulation blocking the rotation of the blade。


No matter what kind of baffle door, the best way of operation is to move the baffle widely in its range of activity regularly, so as to prevent the baffle door from jamming if it does not move for a long time. This is especially true for the bypass damper of the constant mass.


The technical requirements of flue damper are as follows: (1) high temperature resistance; (2) chemical corrosion resistance (acid corrosion); (3) overpressure; (4) negative pressure;


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