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Bypass Damper
Bypass damper is mainly used for waste heat recycling of the flue gas of gas turbine. When the waste heart enters, gas damper (in a level position) opens to let it into the boiler. When the waste heat is not required, the gas damper turns off (in a vertical position), and the gas smoke is ejected through the bypass chimney. The actuating mechanism of the flue gas damper can either activated hydraulically or electrically. Hydraulic flue gas damper: stable operation, damper screen and actuating mechanism are of impact resistance; the driving torque of damper screen and running time adopts step-less adjustment function. It can quickly turn off the damper screen in an emergency (＜30 secs); Spare parts and easy maintenance. Motor-driven flue gas damper: of easy structure and simple system and daily maintenance, with need for little floor space.
When operating normally, the damper starts turning; when approaching to the end point, the torque reduces gradually till the sealing mechanism compresses tightly; this process is achieved automatically through the hydraulic system. The detection of the turning angle is achieved by the two groups of limit switches and valve position transducers inside the sensor box and the turning angle can be displayed concurrently on the local control cabinet and the main control room. When the damper turns to the angle of 10° or 80°, it goes into the oil cylinder’s buffer area; meanwhile the valve position transducer sends signal and the hydraulic system and electrical system changes into the positioning mode automatically, which guarantees to position the damper accurately. Under the automatic condition, the system shall open the corresponding butterfly valve and the air blower to achieve the dynamic sealing and send two signals of the sealing air pressure (normal and low) in accordance with the position of the damper (0° or 90°)
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