Guillotine damper

Function

 

Guillotine damper, also known as slide gate damper, is used to close off hot/cold primary air entering coal pulverizer in thermal power plant. It is designed to isolate hot air for emergency shutdown or a safe working environment during maintenance. Guillotine damper is also used as shutoff damper for flue gas in HRSG or boiler.

 

Structure

 

• Reliable lockdown by eccentric cam. When guillotine damper is in closed status, guillotine gate is pressed closely against packing material. Tight shutoff performance.
• Soot cleaning device is installed on travelling wheel of guillotine damper to scrape ash deposit out of guide rail. Guillotine gate mounted on guide rail could open/close easily without jamming.
• Connection with duct by flange, bolt or welding.

 

Features

 

1. Opening position is shown locally, or transmitted remotely to DCS.
2. Nickel wire reinforced graphite packing. No wearing under 450℃.
3. U shape sealing ring for shaft, stable shaft sealing without leakage.
4. Flexible installation: horizontal, vertical or inclined.
5. Thermal treatment and finish machining could ensure no deformation under huge temperature difference.
6. Manual, electrical or pneumatic operation.

 

Motorized guillotine damper is driven by electric actuator, which drives screw rod to make axial movement. Axial movement will push forward or pull back guillotine gate through bushing sleeve to execute open or close operation.

 

Pneumatic guillotine damper is driven by air cylinder. When it is to close off the duct, air cylinder pushes guillotine into place. Then the other air cylinder will pull crank to lock down the gate through cam mechanism. Damper seat is in close contact with packing material. Flow of fluids is cut off. When it is to reopen the duct, air cylinder operates oppositely.

 

Technical

 

Design pressure: 0.35MPa
Design temperature: ≤550℃
Electric actuator, air cylinder working temperature: -25℃～80℃
Compressed air pressure: 0.4-0.8MPa
Open/close time: ＜4S (pneumatic)