Ash Handling Systems
In a coal or fuel oil fired power plant, ashes from the combustion process are collected in different locations. The Bottom Ash, representing 15 to 20% of the total ash, is collected below the boiler. The ash collected below the economizer and the air-preheater represents 5% and the Fly Ash collected in the Electrostatic Precipitator or Fabric Filter represents 75 to 80% of the total generated ash.
KC Cottrell has a wide proven experience in handling these ashes with specific physicochemical properties.
Bottom Ash Handling System
Slag and ash falling from the furnace are temporarily stored in the bottom ash silo. They are then sent to the ash pond using a hydro ejector. Alternatively, a submerged drag chain conveyor or dry ash extraction conveyor will transport bottom ash to bottom ash silo for ash recycling.
- Bottom Ash Hopper System utilizing Hydro-ejectors
- SDCC(Submerged Drag Chain Conveyor) System
- Dry Ash Extraction System
- Ash Water & Slurry System
Fly Ash Handling System
Conveying air from the blower or air compressor is used to transport ash to the ash silo via ash transport pipe line.
- Positive Pressurized Conveying System
- - Lean(Dilute) Phase System
- - Medium Phase System
- - Dense Phase System
- Negative Pressurized Conveying System(Vacuum System)
- Combination System
- Economizer & Air Preheater Ash handling System / Ash Disposal System
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Ash Handling System Flow Diagram
References
- Youngnam Thermal Power Plant Unit No.1&2, Korea (2002)
- Samcheonpo Thermal Power Plant Unit No.1&2, Korea (2002)
- Jeju Thermal Power Plant, Korea (2004)
- Dangjin Thermal Power Plant Unit No.5&6, Korea (2006)
- Boryeong Thermal Power Plant Unit No.7&8, Korea (2008)
- Yeosu Thermal Power Plant Unit No.2, Korea (2011)
- Gheco Thermal Power Plant Unit No.1, Thailand (2013)
- Rabigh 6 Power Plant Unit No.1~4, Saudi Arabia (2014)
- Jeddah South Steam Plant Unit No.1~4, Saudi Arabia (2015)
- Semangeum Power Plant No.1~2, Korea (2016)
- Samcheok Green Power Plant Unit No.1&2, Korea (2016)
- Shuqaiq Steam Plant Unit No.1~4, Saudi Arabia (2018)
- Songhau 1 Thermal Power Plant, Vietnam (2019)
- Masinloc Coal Fired Power Plant Expansion Project, Philippines (2019)
- Vinh Tan 4 Extension Thermal Power Plant, Vietnam (2020)
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Bottom & Fly AHS, Dangjin Thermal Power Plant