Wet based bottom ash handling system

Wet based bottom ash handling systemPresented By: Group 2Date: 2/9/2013

Parth Jayesh GohelV. Anirudh ReddyYashwardhan JoshiAnne Kranthi hy sy jMdt sgt hw4 h46 yh5 6 km, tym57um,7Tnkrbhkb t7 ktyk fyu k6uTypes of AshAsh : The residue after the incineration of coal.Types of Coal in a Power Plant :a) Bottom Ash : The ash is that is directly collected from the bottom of the boiler.b) Fly Ash : The ash that leaves the boiler from the top of the boiler and goes through the ESP to Silos.

He ryj4grhEryj ru me tuyjBottom Ash Handling SystemBottom Ash is only 20% of the total ash.Bottom Ash-Handling System : ->i. Wet Handling System a. Jet Pump Disposal System b. Submerged Conveyor systemsScraper Chain conveying SystemBelt Conveying SystemScrew Conveying SystemBottom Ash Handling SystemBottom Ash is only 20% of the total ash.Bottom Ash-Handling System : ->i. Wet Handling System a. Jet Pump Disposal System b. Submerged Conveyor systemsScraper Chain conveying SystemBelt Conveying SystemScrew Conveying SystemJet Pump Disposal SystemAlso known as W-shaped SystemHave water impounded system and jet pumps for intermittent removalThe bottom ash falls into a W-type water filled ash storage hopperThe storage ash is removed by means of jet pumps and transported in slurry pipelines to ash slurry sump for its further disposal.Water consumption is very high, almost 3 times that of ash removed.The complete system

Hoppers (W-shaped)

Scraper Chain Conveying SystemBelt conveyors are used to dispose the bottom ash from scraper chain conveyor to bottom ash silo.Employ continuously operating on submerged belt conveyor running below boiler furnace.SSC system receives hot clinker, slag and ash falling from the boiler , through a transition chute to water filled trough.The trough containing the conveyor is filled with water for quenching of bottom ash.Bottom ash discharged onto scraper chain conveyor, where it is fed to grinder that crushes it to 25mm size.The crushed bottom ash is conveyed to bottom ash silo using belt conveyors.Scraper Chain Conveying SystemComponents in the scraper chain systemScraper Chain Conveyor Also called Drop Forged chain. The attachments, here water filled troughs, are welded on to the chain links.Clinker Crusher The large sized ash clinkers are crushed using these crushers. The clinkers get trapped between the rotating jaws of the crushers and get crushed to a required size.Dewatering Tanks The sludge from the crushers come to the dewatering tank, where the water is separated and used again. There are screens present for the same.Scraper Chain Conveyor

Clinker Crusher

Dewatering System

Submerged Belt Conveying SystemIt is the same as chain scrapper, but the only difference being that here we use a belt rather than a chain scrapper and the belt must of a good quality to withstand the temperatures.

Screw Conveying System

Combined System

Dry vs. WetDry Systems are environment friendly and economically beneficial.Wet system disadvantages: Huge water consumptionHigh maintenance cost due to corrosionEnvironmental issues due to leakage of contaminated waterLoss of boiler efficiency,Negative effects on boiler operation due to the low reliability and poor maintainability of wet systems.

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