液压破碎关断门又叫大渣破碎装置或液压挤渣关断门。主要作用有两个:一是对大渣进行预冷却后破碎的作用;二是在设备检修时起关断门的作用。
The Hydraulic Cut-off Gate is also known as large slag crushing machine or hydraulic slag crushing gate. There are two main functions of it: first, large slag can be pre-cooled and crushed; second, the gate will be closed during equipment maintenance, so slag can not be directly into the following equipment.
产品优点:①设置在渣井下面，冷空气进入炉膛时可以充分预热，有利于热量回收。②设置在干渣机上级，有利于冷却。干式除渣冷却的困难就是大渣块，渣块内外温差梯度大，需要较长的冷却时间。而限于空间布置和锅炉进风量要求限制，很难保证此时间。在干渣机上部预破碎后，渣块变小，内部高温可直接与冷空气换热，有利于冷却，同时增加了设备使用寿命。③挤渣门体多，无堵塞问题。对应不同的机组，渣井采用1~4口布置;对应破碎关断门也有1~4口，每口由2~3对门。在任何一对门进行挤压破碎时，另外的挤渣门处于打开状态，可以继续排渣，不影响系统的正常运行。
The Hydraulic Cut-off Gate has many advantages, for example, first heat can be effectively reclaimed. Because it is under the Bottom Slag Hopper, cold air can be effectively preheated when it into the furnace. Second, it is installed before the Air-cooled DSC, good for cooling. In Bottom Ash/Slag Dry Handing System, big slag as large temperature difference between its inside and outside is need a longer cooling time. However, it is difficult to ensure this time because the space layout and wind-inlet flow requirement. But when the slag is pre-crushing by the Hydraulic Cut-off Gate, high temperature can directly change with the cold air, not only conducive to cooling but also extend the equipment life. Third, the Hydraulic Cut-off Gate has many doors, without blocking problems. For different units/funnels, the Bottom Slag Hopper has 1 to 4 parts, so the corresponding Hydraulic Cut-off Gate also has 1 to 4 parts, and every part with 2 to 3 pairs of doors. When one of the doors operates, the others will be opened to discharge, not effect the normal operation of whole system.
液压破碎关断门安装于渣井的下面，采用自支撑式结构，与渣井间采用金属膨胀节连接，与干式排渣机间采用高强度螺栓连接。
Hydraulic Cut-off Gate installs blow the Bottom Slag Hopper, adopt self-supporting structure, connect Slag Hopper with metal expansion joint, and connect DSC with high strength bolt.
每台炉的渣井布置有1~4个落渣口，每个落渣口配有高温摄像头，用于观察落渣情况;设有观察孔和捅焦孔。每个挤渣门由2个油缸驱动，在液压缸的驱动下，挤渣门沿着其下部的耐热钢蓖管导轨做往复直线运动。每扇挤渣门都可根据实际情况单独进行操作。全部挤渣门使用一个液压站控制。每个液压站配套2台油泵，一备一用，可以相互切换。
Bottom Slag Hopper for each of boiler furnished 1 ~ 4 slag-falling units, each slag-falling unit is equipped with high-temperature camera used to observe the slag-falling situation; with observation holes and slag-poked holes. Every Gate/Door driven by two cylinders, it does reciprocating linear motion along the heat-resisting steel tube guide at the bottom of it. Every Slag Cut-off Gate may operate separately according to the actual situation. All Slag Cut-off Gates are control by one hydraulic station. Every hydraulic station sets 2 oil pumps, one use and the other stand by. They can switched with each other.
在锅炉正常运行时，挤渣门全部处于开启位置，小于200×200mm的底渣通过挤渣门下部的蓖板落至干式排渣机的输送带上;大于200mm的渣快被密集格栅拦截。此格栅具有两个作用:阻挡>200mm的渣块和承受大渣块冲击。密集格栅下面设置有大型钢结构，可承受巨大渣块从炉膛高处下落的冲击。保证除渣系统的正常运行。参见图4-2。
During normal operation of boilers, Hydraulic Cut-off Gate is in open position, all slag less than 200 × 200mm fall into the conveyor belt of DSC through the gate grid; slag more than 200mm are intercepted by the dense grid. There has been large steel structure below the dense grid. This grid also can withstand impact of large slag, to ensure the normal operation of the Bottom Ash Dry Handing System. Show in Fig.4-2.
当通过摄像头观察到有大于200×200mm的底渣落至蓖管上时，延迟一段时间(5~10分钟左右)，待落下的大渣初步得到冷却后，在控制系统点击相应的挤渣门关闭按钮，挤渣门对大渣进行预破碎，破碎后的渣落至干式排渣机的输送带上。若遇到内部高温大渣快，则需要多次挤压破碎。任何一扇挤渣门可独立运动，且有3个位置响应监测点。
Observe through the camera, more than 200 × 200mm bottom slag fall on the grid, delay some times (about 5~10 minutes), after large falling slag are initially cooled, control the corresponding Slag Cut-off Gate closed button in the control system, the large slag pre-broken by Slag Cut-off Gate and then fall into the conveyor belt of DSC. Because hot sticky, it need several times to cooling & broken the big slag which high temperature inside. Any Slag Cut-off Gate can be independence movement, and three locations respond to the monitoring point.
当后续除渣系统遇到故障，故障设备发出报警信号，需要临时停机进行检修时，在控制系统将挤渣门全部关闭。使渣斗形成一封闭容器。检修完毕后，按下面步骤开启挤渣门。
When the follow-up device failures, faulty equipment sends a warning signal, when need to temporarily shut down for maintenance, control Slag Cut-off Gates to closed. Slag Hopper forms a closed container. After maintenance, open the Slag Cut-off Gate according to the following steps.
开启挤渣门步骤:
首先将干式排渣机输送带的变频器调到额定频率，即运行速度调至最快速度。
点动接近干式排渣机头部(弧段)的第一对挤渣门，置于较小的开口位置，大量存渣落到干渣机上被冷却并输送，此时大渣检测装置可能报警，可以忽略报警，干渣机运行一段时间，待大渣检测装置处于正常位置，说明渣量减少。
将此挤渣门慢慢打开，直到完全打开。
同理，将所有挤渣门依次全部打开。
Steps of open the Slag Cut-off Gate。
First, the transducer of DSC(Dry Slag Conveyor) belt adjust to rated(60Hz), the fastest operation speed。
Jog control, make the first pair of Slag Cut-off Gate which is close to the arc/head of DSC on smaller opening position, many slag will fall on DSC and be cooled and conveyed, this time large slag detection device may alarm, alarms can be ignored, when DSC runs for some times, with big slag detection device in the normal position, slag quantity reduced。
Open the Slag Cut-off Gate slowly, until to open fully。
Similarly, open all doors in turn。
在打开每对挤渣门过程中，如发现有大渣，视其渣块的大小，适时进行挤压。
When opening the Slag Cut-off Gate, if there are large slag, timely extrusion depending on the size.
特别注意
正常运行时每对挤渣门每月要进行一次全开、半开、全关操作。
事故关断后处理后，慢慢开启每对挤渣门，待渣量减小大渣检测回复正常后再进行操作。否则可能会引起干渣机过载。
如果开启挤渣门时，大量灰渣排泄到干渣机上，可能引起过载;此时允许干渣机倒转，将渣从其尾部排出。如图4-3。
during normal operation, every Slag Cut-off Gate should do a whole-open, half-open and whole-closed operation once a month.
Be carefull, when open all closed gates after maintenance, must care & jog control, allowed & smaller Slag fall on DSC. After DSC runs for some times, with big slag detection device in the normal position, allowed another operation.
There are too much slag to DSC may over loading, when you open the gate quickly. At this point, DSC is allowed to reverse. Slag discharged from the end of DSC. Show in Fig.4-3.
