A Bottom Ash Handling System (BAHS) is a system designed to efficiently collect, transport, and dispose of or process bottom ash (also known as clinker ash) that settles at the bottom of a boiler after coal combustion. It’s a crucial part of a power plant’s operation, ensuring proper ash management and environmental compliance.
Here’s a more detailed look at the components and processes involved in a BAHS:
1. Collection and Cooling:
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Submerged Scraper Chain Conveyor (SSCC):A common method involves using an SSCC to extract bottom ash from the bottom of the boiler. This conveyor operates underwater, which helps to cool the ash and prevents dust from escaping.
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Dry Bottom Ash Conveyors:In some cases, a dry conveyor system is used, transporting the ash directly without water cooling.
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Bottom Ash Hopper:A large hopper, often lined with refractory material, is used to collect the ash before further processing.
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Cooling:Whether using water or air, the ash is cooled to a manageable temperature.
2. Crushing and Processing:
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Clinker Crusher:The ash may be crushed to reduce its size, making it easier to handle and transport.
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Dehydration (Wet Systems):In wet systems, the ash is further dewatered, separating the solids from the water.
3. Transport and Storage:
- Belt Conveyors: Crushed and dewatered ash can be transported using belt conveyors.
- Scraper Conveyors: These conveyors can also be used for horizontal or inclined ash transport.
- Bottom Ash Silos: Intermediate storage silos are used to hold the ash before final disposal or processing.
4. Ash Disposal or Recycling:
- Ash Ponds: Wet bottom ash can be directed to ash ponds, where it is stored and the water is treated.
- Landfill: Dry bottom ash may be transported to a landfill for disposal.
- Recycling: Bottom ash can be recycled into various products, such as cement, lightweight concrete, or used as a filler material in road construction.
5. Key Considerations:
- Dust Control: Proper dust control measures are essential to prevent air pollution.
- Environmental Regulations: BAHS must comply with environmental regulations regarding ash disposal and waste management.
- System Design: The design of a BAHS depends on the type of boiler, fuel, and specific requirements of the power plant.
In summary, a BAHS is a complex system designed to manage bottom ash effectively, ensuring proper cooling, transport, processing, and disposal or recycling, while adhering to environmental regulations and safety standards.
Post time: Apr-11-2025