Electric Power Industry
Hazardous areas in the power industry predominantly fall under Zone 1 (frequently explosive atmosphere) or Zone 2 (occasionally explosive atmosphere) as defined by national standards. Risk media are primarily categorized into two types:
1. Dust: Coal dust in pulverized coal preparation workshops of thermal power plants, and straw/wood chip dust in biomass power plants. When suspended concentrations reach explosive limits, ignition sources can trigger dust explosions.
2. Gaseous substances: Blast furnace gas/coke oven gas (used in co-firing power generation) in thermal power plants, biogas (methane) in waste-to-energy plants, and hydrogen in hydrogen energy storage power stations. Leaks can mix with air to form explosive gas mixtures.
Specific Application Scenarios for Core Components
Thermal Power Generation (Primary Application Areas)
1. Pulverized Coal Preparation System: Motors driving coal mills, coal powder conveying fans, and bucket elevators must employ explosion-proof designs suitable for Zone 2 dust explosion hazardous environments with suspended coal powder. Explosion-proof rating must meet II 2G Ex db IIBT4 Gb, with a protection rating no lower than IP65. This prevents dust accumulation inside motors causing overheating while blocking motor sparks from igniting coal powder.
2. Gas Co-firing Systems: Some thermal power plants blend blast furnace gas or coke oven gas to reduce costs. Drive motors for gas booster pumps and gas transfer fans must be explosion-proof, suitable for Zone 1 gas explosion hazardous environments with gas leaks. The explosion-proof rating must meet or exceed II 2G Ex db IIBT4 Gb.
3. Desulfurization and Denitrification Auxiliary Systems: Slurry circulation pumps in desulfurization systems and ammonia gas transfer pumps in denitrification systems (ammonia being a combustible gas) require explosion-proof motors. Biogas generated during wastewater treatment in some power plants necessitates explosion-proof motors for corresponding agitators.
New Energy Power Generation Sector
1. Biomass Power Generation: Drive motors for crushers, conveyors, and silo unloaders handling raw materials like straw and wood chips must be explosion-proof to mitigate dust explosion risks during crushing and conveying. Gas fan motors in biomass gasification power systems must be suitable for Zone 1 hazardous environments containing gasification products (hydrogen, methane).
2. Waste Incineration Power Generation: Drive motors for leachate pumps in waste storage silos and biogas collection fans must be explosion-proof to mitigate methane leakage risks from waste fermentation. Combustion fans for incinerators also require explosion-proof motors if installed in areas with biogas diffusion.
3. Hydrogen Energy Storage Power Plants: Drive motors for hydrogen compressors and hydrogen transfer pumps must employ Ex d IIC T4 high-grade explosion-proof design, suitable for Zone 1 hazardous environments with hydrogen (Class IIC explosive gas), preventing motor sparks from igniting hydrogen and causing explosions.
Power Industry Auxiliary Systems
1. Power Plant Wastewater Treatment Station: The anaerobic treatment unit generates biogas. The corresponding sewage lift pumps and agitator motors must be explosion-proof.
2. Coal Storage Yard Auxiliary Equipment: Coal dust is generated during coal crushing and transfer operations. The drive motors for crushers and belt conveyors must be explosion-proof in areas with high dust concentrations.
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Nanyang Explosion-Proof is a specialized manufacturer of explosion-proof motors and high-efficiency motors integrating design, production, sales, and service.
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