Ash management system
The ash management system manages the ash through the bottom ash management system, the coarse ash management system, the fly ash management system, the ash removal system to the ash removal area and the Ash pond water recovery system and lower ash overflow
Parts of ash management system
Bottom ash handling system
Coarse ash management system (economising ash)
Air preheated ash handling system
Fly ash management system
Ash sludge removal system
Lower ash handling system: - The bottom ash resulting from the combustion of coal in the boiler falls into the ground, refractory, Volume to store the bottom ash and ash of the economiser of the maximum permissible condition with the specified speed. The slurry formed is conveyed to a slurry sump through pipes.
Economiser Ash: -Ash generated in the economiser hoppers is continuously evacuated through discharge boxes. The economiser generated continuously is fed by gravity to the respective lower ash hopper pipes with required slope.
Air heater ash handling system: - The ash generated from the APH hoppers is evacuated once in a change by means of a vacuum transport system connected to the vacuum transport system of the ESP hopper.
Fly ash handling system: - Fly ash is considered to be collected in ESP hoppers. Fly ash from electrostatic precipitates or tissue bag filters (or sometimes both), located at the exit of the furnace and before the induced draft fan, are extracted by vacuum pumps.
The ways of using fly ash
1. Production of concrete, as a substitute material for Portland cement and sand
2. Embankments and other structural fillings (usually for the construction of roads) Stabilisation and solidification of wastes.
3. Production of cement clinkers - (as a clay substitute)
4. Mine recovery
5. Stabilisation of soft soils
6. As a replacement material for aggregates (eg for the production of bricks)
7. Mineral load in asphalt concrete
8. Agricultural uses: soil amendments, fertilisers, livestock feeders, stabilisation of soils in livestock nurseries and agricultural cuttings
9. Loose application in rivers to melt ice
10. Loose application on roads and parking lots for ice control
11. Other applications include cosmetics, toothpaste, kitchen counter tops, floor and ceiling tiles, bowling balls, etc.
Ash sludge disposal system
The bottom ash slurry, the fly ash slurry and the coarse ash slurry will be pumped from the common slurry sump to the area of the dike which is at a distance from the house of the Sludge pump
Ash Management System Requirement
In the coal of the Thermal Power Plant it is generally used as a fuel and therefore the ash is produced as the By-product of the Combustion. The ash generated at the power plant is around 30-40% of the total coal consumption and therefore the system is obliged to handle Ash for proper use or disposal.