The smoke channel shutter employs a single-axis driven double-blade damper structure. The double-layer blades are designed with a sealing chamber in the middle to introduce sealed air. This sealed air, at a pressure higher than that of the smoke, is introduced into the damper, forming a sealed air isolation layer between the double dampers, thus blocking the passage of the smoke flow.
The smoke channel damper door is primarily used in the flue gas desulfurization system's absorption tower inlet and outlet, or bypass flue, or in flue gas denitrification and dust removal systems.
Below, we introduce the design and operational technical requirements for the flue damper door.
1. The smoke duct damper door should be designed and manufactured according to the technical requirements provided by the buyer, ensuring safe and stable operation under the working conditions provided by the buyer. 2. Each damper component is designed to withstand the full range of high-temperature deviations of the flue gas without damage, sticking, curling, or leakage. The device is bypassed when the temperature exceeds 150°C. Operation time of high-temperature flue gas (approximately 180°C) does not exceed 30 minutes.
The design of the shutter should be able to withstand the temperature and pressure of smoke under various operating conditions without deformation or leakage. The design of the shutter and the drive unit should be able to withstand corrosion that may be caused by the working medium under all operating conditions.
4. The complete smoke duct damper set includes the frame, double-layer panel, electric actuator, along with all necessary seals and control components for the damper seal and sealing system. Operates with a single electric actuator control method.
All smoke channel dampers will be double-plate designs. The smoke dampers must maintain 100% airtightness under design pressure and temperature to facilitate maintenance work downstream of the dampers. The operation of all isolation dampers is flexible, reliable, and convenient. All electrically operated dampers should have both remote control and on-site manual operation capabilities. Additionally, on-site installed damper position indicators will be provided. Furthermore, all damper doors should be equipped with manual operation devices, with the handwheel positioned near the electric actuator or integrated within the actuator itself.
6. The smoke damper features an on/off function. The speed of the electric actuator meets the operational requirements of the boiler and flue gas fan. The indicator for the open position will be used for the interlock of the booster fan and boiler. Each smoke duct damper set includes the frame, damper body, electric actuator, damper sealing system, and all necessary seals and control components. The installation of the smoke duct damper frame is bolted flange connection to the flue.
7. The smoke dampers will be operable under the maximum pressure difference and will close tightly without bending or jamming. Additionally, the dampers should match the locking device in both fully open and fully closed positions. The design and placement of the dampers within the flue should minimize the accumulation of dust or debris on the damper blades.
Actuators should be equipped with position-limiting switches at both ends, switches for rotation in both directions, an emergency handwheel, and a mechanical interlock for maintenance purposes.
The model and layout of the electric actuator, the location of the sealed air interface, and the position of the drain outlet should be provided by the buyer, in accordance with the requirements of the engineering design unit.
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