Waste incineration plants present a challenging operating environment with high temperatures, corrosive gases, dust, and chemical media, demanding exceptional valve performance. High-performance butterfly valves, with their resistance to extreme conditions, rapid response, and long service life, are crucial in ensuring the efficient and stable operation of incineration systems. Below are their specific applications and core advantages:
I. Main Application Scenarios
1. Incineration Furnace and Flue Gas Treatment Systems
- High-Temperature Flue Gas Control: With flue gas temperatures at the incinerator outlet reaching 850-1000°C, butterfly valves need to be made from high-temperature alloys (such as Inconel 625) or have water-cooled valve body designs to regulate flue gas flow and prevent valve body deformation.
- Acidic Gas Treatment: In desulfurization (SO₂), deacidification (HCl), and denitrification (NO₃) processes, butterfly valves come into contact with corrosive media from wet scrubbing (such as dilute sulfuric acid and sodium hydroxide solution) and need to be lined with fluorine (PTFE) or Hastelloy materials to resist acid and alkali corrosion.
- Activated Carbon/Lime Slurry Injection Pipelines: To control the flow of adsorbents, valves need to be wear-resistant (e.g., with tungsten carbide coating) and anti-blocking.
2. Waste Heat Recovery and Steam Systems
- Waste Heat Boiler Steam Regulation: In high-temperature and high-pressure steam (above 400°C, PN40) pipelines, butterfly valves require metal hard sealing (e.g., Stellite surfacing) to ensure zero leakage and resistance to thermal shock.
- Condensate Circulation: When handling condensate containing trace amounts of acid, 316L stainless steel valve bodies with EPDM seals are used to prevent corrosion and scaling.
3. Fly Ash and Bottom Ash Handling
- Fly Ash Conveying Pipelines: Fly ash particles are highly abrasive, so butterfly valves require ceramic lined valve discs or surface hardening treatment to extend service life.
- Bottom Ash Cooling Systems: When transporting high-temperature bottom ash (300-500°C), valves need to be heat-resistant and wear-resistant, and equipped with extended valve covers to prevent heat conduction damage to actuators.
4. Odor Collection and Ventilation Systems
- Garbage Pit Ventilation: To control corrosive odors containing hydrogen sulfide (H₂S) and ammonia (NH₃), butterfly valves require fluororubber seals and epoxy coatings to prevent gas leakage and material aging.
- Emergency Exhaust Isolation: Rapidly cut off airflow in case of fire or malfunction, requiring pneumatic quick closing (≤1 second) and fire protection certified design.
5. Wastewater Treatment and Chemical Dosing
- Leachate Treatment Pipelines: High-concentration organic wastewater contains chloride ions and acids/alkalis, requiring butterfly valves made of duplex stainless steel or lined plastic materials to avoid pitting and stress corrosion.
- Chemical Dosing: For odor control and neutralizing agents, PTFE-lined butterfly valves resist strong acids and alkalis, ensuring precise dosing and no leakage.
II. Core Advantages
1. Adaptability to Extreme Environments
- High-Temperature Resistance: Valve bodies and sealing materials can withstand temperatures from -50°C to 600°C, adapting to temperature fluctuations in incineration plants.
- Corrosion Resistance: Fluorine lining, Hastelloy, and other materials can cope with acidic gases and wet chlorine environments, extending service life 3-5 times compared to ordinary valves.
- Wear-Resistant Design: Ceramic coating or tungsten carbide treatment on valve discs resists fly ash and particulate erosion, reducing maintenance frequency.
2. High Sealing and Safety
- Zero Leakage Design: Double eccentric or triple eccentric metal sealing or elastic sealing structures meet EU TA-Luft standards, preventing toxic gas leakage.
- Explosion-Proof and Fire Protection Certification: Actuators comply with ATEX/IECEx explosion-proof requirements, and valve bodies pass API 607 fire tests.
3. Efficient Control and Intelligence
- Rapid Opening and Closing: Pneumatically actuated valves have a response time of fewer than 3 seconds, quickly isolating hazardous sources in emergencies.
- Intelligent Monitoring: Integrated sensors and Internet of Things (IoT) modules enable real-time monitoring of valve status (temperature, flow, sealing), supporting remote control and predictive maintenance.
4. Economic Efficiency and Environmental Compliance
- Low Flow Resistance and Energy Saving: The flow resistance coefficient of a fully open butterfly valve is only 1/10 of that of a gate valve, reducing pumping energy consumption by 15-20%.
- Long Service Life and Reduced Emissions: Reduced downtime for maintenance helps incineration plants meet environmental emission standards such as GB 18485.
III. Typical Application Cases
- Flue Gas Recirculation System: Regulates secondary air volume, optimizes combustion efficiency, and reduces dioxin generation.
- SNCR/SCR Denitrification: Precisely controls urea or ammonia injection, increasing denitrification efficiency to over 90%.
- Bag Filter Bypass: Switches flue gas path in emergencies to protect dust removal equipment.
Conclusion
High-performance butterfly valves are essential in core processes of waste incineration plants, such as flue gas treatment, waste heat recovery, and ash management. Through material innovation (e.g., ceramic lining, special alloys), sealing technology upgrades (double eccentric or triple eccentric/double sealing), and intelligent integration, they solve problems like corrosion, sticking, and leakage common in traditional valves. Their application not only enhances the reliability and energy efficiency of incineration systems but also helps enterprises achieve environmental compliance and low-carbon operations.
Contact Shengfei today for high-quality butterfly valve solutions tailored to your Waste Incineration Plants processing needs.
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