Thermal power air duct pipelines connect boiler combustion, air supply and flue exhaust systems. A variety of matched accessories are equipped to ensure stable airflow, safe operation and convenient maintenance. These standard accessories cover flow control, safety protection, deformation compensation, inspection access and auxiliary supporting parts, serving the long-term reliable running of the whole duct system.
Flow control accessories are widely applied to adjust and cut off airflow. Multiple types of dampers and valves dominate this category. Ventilation butterfly valves, multi-blade round dampers and square dampers flexibly regulate air volume and flow speed according to boiler working load. Isolation doors and flue check valves prevent air backflow and isolate pipeline sections during equipment maintenance. Special structural valves like petal louver valves and three-way reversing valves change airflow directions to meet different combustion and ventilation demands.
Safety protection accessories defend pipelines against abnormal pressure and impurities. Explosion doors of diaphragm and bevel styles release sudden impact pressure instantly to avoid pipe rupture and equipment damage. Weighted flap valves and air lock valves discharge accumulated ash while keeping internal air pressure stable. Impurity separators effectively filter wood scraps and sundries mixed in airflow, preventing pipeline blockage and component abrasion.
Compensation and sealing accessories adapt to harsh operating environments. Non-metallic expansion joints and corrugated compensators absorb thermal expansion, cold contraction and mechanical vibration displacement, lowering pipeline structural stress. Sealing fittings and flange connectors tightly joint pipe segments, effectively stopping flue gas leakage and outside air infiltration. High temperature resistant materials enable these accessories to endure long-time smoke and heat erosion.
Maintenance access accessories reserve overhaul and cleaning channels. Steel manholes, handholes and ash removal holes are reserved on pipes and equipment shells. Staff can carry out routine inspection, dust cleaning and fault repair without dismantling large pipeline structures, greatly improving maintenance efficiency. Fan inlet boxes stabilize incoming airflow and protect fan units from uneven air impact.
Other practical auxiliary accessories enrich system functions. Silencers reduce running noise to satisfy environmental protection requirements. Expansion indicators real-timely monitor pipeline deformation status. Diversified driving parts including electric, pneumatic, hydraulic and manual handwheel sets support flexible operation of all control valves.
All these duct accessories coordinate closely. They optimize ventilation efficiency, eliminate operational risks and extend pipeline service life, becoming indispensable supporting parts for thermal power air duct engineering.
