Presented By

Himanshu Chandraker

Subhashish Banerjee

Vivek Gulhare

There are two systems broadly for Bottom Ash and Fly ash. Types of Ash

Bottom Ash: from the furnace bottom Fly Ash: from flue gases

Capacity of Ash handling Plant Coal Consumption per day : Appx 22000 T/day Ash % in Design coal : Appx 40 % Capacity of AHP : Appx 8800 T/day Bottom ash : Appx 20 % Fly ash : Appx 80 %

Ash Handling Plant

Bottom ash hopper

Scrapper conveyor

Clinker Grinder

De-setteler Tank

De watering Bin

Mixing Tank

HCSD

Ash Dyke

APH/ECO/ESP Conveying

INTERMEDIATE SURGE HOPPER

TRANSMITTER VESSEL

FLY ASH SILO

CLOSE/OPEN TRUCK Mixing Tank

HCSD

Ash Dyke

PROCESS FLOW – ASH HANDLING SYSTEM

Scrapper Conveyor: this is located below each of the boiler. This collects the bottom ash generated. High pressure water from the HP pump discharge is sprayed to reduce the ash temp and also to avoid clinker formation. The high pressure water is also required for sealing of scrapper from atmosphere.

(OUTPUT： 0～ 60t/h， SCRAPER SPEED： 0～ 3.0m/min ADJUSTABLE FREQUENCYREGULATED)

Single/Double roll clinker grinder which crush <25 mm

Rolls will be of Cast Chrome Vanadium-Molybdenum wear resisting steel

Clinker Grinder. As the ash is cohesive in nature it is likely to form clinkers at high temperatures. Hence a clinker grinder is used which breaks the big size lumps to smaller amorphous ash. The ash coming out is of less than 6 mm size. ( desirable size at the O/L of clinker grinder).

(60t/h GRANULARITY：≤ 25mm)

ESP: as the name suggests it is precipitation under electrostatic field. Here a high voltage (72 kV) DC current is applied across the electrodes to generate electric field. This high field causes the ionization of the Ash particles. As the ionization occurs the ash particles are separated into positive and negatively charged ions.All electrostatic precipitators, regardless of their particular designs, contain the followingessential components:• Discharge electrodes• Collection electrodes• High voltage electrical systems• Rappers• Hoppers• Shell

ESP

DE DUSTING UNITRepresentation of gas flow in a two-stage precipitator

AIR SYSTEM 7 nos of screw compressor installed for each

unit. (SA375W, Q=63Nm3/min, P=0.8MPa) 7 nos of dryer is also installed for each unit. 5 nos of air receiver tank installed for

interrupted air supply. 2 nos of blower installed for fluidising of

hoppers.

centrifugal type

•Slurry pumps: slurry pumps are provided 2 nos combined for each unit to pump the slurry to the Dewatering Bins.

HP & LP PUMP there are 2 nos of HP pumps, that provides

water for bottom ash conveyor slurry conveying. (TYPE:D155-30×7,Q=170m3/h， H=200m)

There are 2 nos of LP pumps, that provide water for mixing tank & screw conveyor. (TYPE:GMZ80-40-130,Q=55m3/h， H=45m)

DE WATERING BINS the slurry coming from slurry pumps is

collected and stored in the dewatering where the removal of water or separation of water and ash takes place. The process takes place under the principle of decantation. The water gets collected in the top area and goes to the settling tank. The ash settled at the bottom goes the HCSD through 2 belt conveyors.

SETTLING TANK the water coming from Dewatering Bins

still contains some ash and hence is allowed to settle down in the Settling tank. The ash settled at the bottom is again sent to the DB via sludge pump whereas the water goes to the fresh water pond.

HCSD PUMPThe GEHO pump is a crankshaft driven three-cylinder single-acting high pressure piston diaphragmp pumps. The unique preformed GEHO diaphragm separates the pumped slurry from all the pump moving parts. This range of pumps is ideal to handle abrasive and corrosive slurries against high pressures at the lowest possible total cost of ownership. High efficiency and reliability strongly contribute to this objective. The TZPM pump range is developed and manufactured by Weir Minerals Netherlands .

GEHO type : TZPM800, 315 m3/hr, 8000Kpa, 737 KW.

THANKS