High temperature flue gas butterfly valve

高温烟气蝶阀is an industrial control valve designed specifically for high-temperature dusty gases, mainly used in flue gas treatment systems in industries such as metallurgy, power, and chemical. Its core features are as follows:

1、 Structural Design and Core Features
High temperature resistant structure
Main material: The valve body is made of carbon steel welding or steel plate rolling, lined with refractory concrete or hard alloy layer (such as tungsten chromium cobalt alloy), ensuring stability at high temperatures of 950 ℃~1200 ℃.
Insulation scheme:
Split type insulation chamber design, with hot steam introduced to prevent smoke crystallization and blockage in the valve stem area;
Extended bracket+asbestos insulation layer blocks heat conduction and protects the actuator.
Sealing technology
Dynamic compensation sealing: The elastic metal sealing ring (such as a T-shaped soft ring+stainless steel plate combination) automatically compensates for wear through spring pre tension, achieving bidirectional zero leakage (leakage rate ≤ 0.1%);
Double sealing system: metal hard sealing is the main component, supplemented by flexible graphite packing as a secondary insurance.
Anti jamming design
When the valve plate comes into contact with the valve port, the cleaning rubber can retract into the inner groove to avoid jamming (Jianuo patent solution);
The upper/lower valve stem separation structure reduces deformation and blockage caused by thermal expansion.
2、 Key technical parameters
Scope of parameter indicators applicable scenarios
Nominal diameter DN50~DN4000 small pipeline to large flue
Temperature range -30 ℃~1200 ℃ Dust containing flue gas and high-temperature coal gas
Medium and low pressure pipeline system with nominal pressure ranging from 0.05MPa to 2.5MPa
Leakage rate ≤ 0.5% (soft seal) Environmental strict control scenario
Drive mode: electric/pneumatic/hydraulic automation control

三、行业应用与选型建议
‌冶金行业‌：高炉煤气回收系统，需耐粉尘冲刷的堆焊合金蝶板‌；
‌电力行业‌：脱硫脱硝管道，优选三偏心结构阀门（如BD943W型）确保双向密封‌；
‌极端工况‌：
1000℃以上超高温：采用水冷阀体（循环水降温）或310S特种合金阀杆‌；
高颗粒物介质：阀板表面喷涂碳化钨涂层（硬度HRC62+）‌。
四、高温烟气蝶阀维护要点
‌安装规范‌：必须水平安装，介质流向与阀体标识一致‌；
‌定期检查‌：密封圈弹性状态、阀杆结晶物清理，防止启闭失效‌。

高温烟气蝶阀通过材料创新与结构优化，解决了传统阀门在高温、含尘工况下的密封失效与卡滞问题‌，是工业烟气管理的核心设备之一。