The flue gas and coal powder piping system is a core facility of thermal power plants, undertaking fuel delivery, air supply, smoke exhaust and pressure regulation tasks. A complete system consists of pipelines, control valves, safety protection parts, connection accessories, silencing and shock absorption devices as well as maintenance structures, supporting stable and safe boiler operation.
Various valves and dampers act as control core components. Diversified regulating and isolating equipment controls airflow, coal flow and smoke discharge status. Common types include slide gate valves, flue check valves, pneumatic poppet valves and multi-blade round dampers. Isolation doors and coal gate valves cut off medium flow during overhaul. Special valves such as three-way reversing valves and adjustable shrinkage holes adjust conveying speed and flow direction flexibly to match different operating loads.
Safety protection devices guarantee system operational security. Explosion relief accessories are essential to cope with sudden pressure surge. Diaphragm type and bevel explosion doors release explosion pressure instantly to prevent pipeline cracking. Impurity separators and air lock valves filter wood chips and sundries inside pulverized coal, avoiding pipeline blockage and equipment abrasion. Gravity ash discharge valves discharge accumulated dust smoothly while maintaining internal air pressure balance.
Compensation and connecting accessories adapt to complex operating conditions. Non-metallic expansion joints and corrugated compensators absorb thermal expansion, contraction and vibration displacement of pipelines, reducing structural stress. Different specifications of steel manholes, handholes and ash removal holes reserve access for daily inspection, cleaning and fault maintenance. Flanges and sealing parts ensure tight connection between pipes and equipment to stop gas leakage.
Supporting auxiliary equipment improves overall operating efficiency. Fan inlet boxes stabilize inlet airflow for induced draft and forced draft fans. Silencers lower operational noise and meet environmental standards. Expansion indicators monitor pipeline deformation in real time. Multiple driving mechanisms including electric, pneumatic, hydraulic and handwheel types realize automatic and manual switching control of all valves.
These matched components form an integrated circulating system. They cooperate to finish coal feeding, combustion air supply, flue gas discharge and dust processing. All parts work coordinately to ensure high-efficiency, energy-saving and safe running of power generation units.
