Ash handling systems are typically categorized into three main types: fly ash handling, bottom ash handling, and ash slurry disposal. These systems utilize various methods, including mechanical, pneumatic, and hydraulic systems, to collect, transport, and store ash from various points within a thermal power plant.
1. Fly Ash Handling:
• Pneumatic Systems: These systems use air or other gases to move fly ash, which is collected from various points like the air preheater, economizer, and electrostatic precipitator (ESP).
• Examples: Vacuum pneumatic conveyors, dense phase pneumatic pressure conveying systems.
• Storage: Fly ash is typically stored in silos for later use or disposal.
2. Bottom Ash Handling:
• Mechanical Systems: Bottom ash, which is coarser and collected at the bottom of the boiler, is often handled using mechanical systems like conveyor belts and scraper conveyors.
• Hydraulic Systems: Water can be used to convey bottom ash, particularly when it needs to be transported over longer distances or in slurry form.
• Examples: Bottom ash hoppers, ash ponds.
3. Ash Slurry Disposal:
• Hydraulic Systems: These systems mix ash with water to create a slurry for transport and disposal, often to ash ponds.
• Examples: Ash slurry pumps, conventional lean ash slurry disposal systems.
4. Other Ash Handling Methods:
Dry Ash Handling: This method focuses on conveying and storing dry ash without the need for water.
Coarse Ash System: Some systems handle coarse ash collected from various points in the boiler, such as economizer, airheater, duct, and bed ash.
In summary, ash handling systems are crucial for managing the waste generated in thermal power plants. They employ various methods, including pneumatic, mechanical, and hydraulic systems, to collect, transport, store, and dispose of different types of ash, such as fly ash, bottom ash, and ash slurry.
Post time: Apr-11-2025