Ash Handling in powerplants.ppt - SlideShare

• 2. Ash handling system overview  Bottom ash handling system.  Fly ash handling system (both wet & dry).  Slurry handling system from slurry pump house to ash dyke.  Ash water system.  Ash water recirculation system.
• 3. Types of ash Generated  Fly ash ( approx 80%)  Bottom ash ( approx 20%) N.B:-- say 1 kg of coal contains 30 to 40 % of ash. Let in a day of 24 hrs 20 MT of coal burns then ash quantity = x30 %= MT. So Bottom ash =x20%= MT & Fly ash=x80%= MT
• 5. System consists of ‘W’- type water impounded hopper with jet pumps for intermittent removal of bottom ash. (WW) Bottom ash system
• 6. Components of the system are :---- 1. Water impounded ash hoppers 2. Hopper Feed gate- 4 no & 6 no 3. Clinker grinders-4 no & 6 no 4. Jet pumps 5. BA slurry line to ash slurry pump house 6. Slurry Transportation to ash dyke by means of ash disposal pumps. Intermittent type water impounded hoppers & Jet pump system.
• 7. BOTTOM ASH HANDLING SYSTEM
• 8. W- Shaped Bottom Ash Hopper
• 9. Bottom Ash Hopper- Feed Gate Arrangement
• 10. Feed Gate & Grinder Rolls
• 11. Flow diagram of hopper overflow water in jet pump system BA HOPPER Over Flow Tank Settling Tank Surge Tank Sludge to Ash Slurry pump House sump. Over Flow pumps Sludge Pump To ash water P/p house by Gravity
• 12. Ash Removal System from Economizer,PAPH,SAPH Ash collected in Economizer, PAPH & SAPH hoppers drop continuously through Vertical pipe connected to the Flushing apparatus beneath each of the hoppers For the flushing apparatus water is provided from FAHPs.
• 13. Fly ash handling system The fly ash handling system consists of two modes of operation, Viz 1.Wet mode operation and 2.Dry mode operation.
• 14. Ash evacuation from ESP hoppers 1. Wet mode:--Ash evacuated from ESP hoppers through vacuum pumps & fed to wetting head (vacuum system) and collector tank units where ash is mixed with water & resultant slurry is discharged to slurry trenches. 2. Dry mode :-- Ash evacuated from ESP hoppers through vacuum pumps & collected in Buffer hoppers & Air lock tank, is transported to storage silo by compressed air (pressure conveying system) through pressure conveying pipe lines.
• 16. ESP Internals
• 18. Components of wet fly ash system 1.ESP hopper 2.Plate valve for isolation . 3.Material Handling Valve (MHV) 4.Piping up to wetting head 5.Wetting head 6.Air washer 7.Vacuum pump 8.Trench up to ash slurry pump house.
• 19. Flow diagram of wet fly ash system ESP Trench 2 ASPH Air outlet M H V Plate valve Vacuum pump Wetting head Air washer Air in
• 20. FLOW PATH OF WET MODE FLY ASH ESP HOPPER WETTING HEAD AIR WASHER DISCHARGE PIPE SEAL BOX FLY ASH SLURRY TRENCH ASH SLURRY PUMP HOUSE AIR TO VACUUM PUMP
• 21. Flow diagram of Dry fly ash system Silo TRUCK Buffer hopper ESP Hopper Vacuum pump ALT ALT Air outlet Bag filter Bag filter Air from TAC Primary & secondary Collector
• 22. Flow path of dry mode fly ash ESP Hopper Buffer hopper Air lock tank Ash storage silo Truck/volvo/wagons Air to Vacuum pump
• 23. Wet & Dry Mode
• 24. Ash water pump house Ash water pumps Ash water pumps Ash water sump BA HP Pumps BA LP Pumps Flushing Water Pump FA HP Pumps From Raw water pumps From CW Blow down From Ash Water Recirculation System From BA Overflow Pumps
• 25. Ash water pumps (located in ash water pump house) 1.Bottom ash HP water pumps- 2/2 no. 2.Bottom ash LP water pumps-3/5 no. 3.Flushing water pump-1/1 no. 4.Fly ash HP water pumps-3/5 no.
• 26. Use of Ash Water Pumps  BA HP pump  BA LP pump  Flushing water pump  Fly ash HP pump  Boiler bottom area  Boiler bottom area & make up of BAH/ASPH sumps.  Flushing of ash disposal lines.  Wetting head of fly ash system,SAPH, PAPH, Eco hoppers.
• 27. Ash Water Pump House
• 28. Ash disposal system  Sump plug valves-4no  Ash sluice trench  Gear box and Fluid coupling  Ash slurry valves  Slurry sump liners  Drain pumps  Disposal pipes and fittings  Ash Disposal lines to dyke.
• 29. Flushing Water Line LP seal water HP Seal water
• 30. Ash Slurry Pump House
• 32. AWRPH ASH DYKE STAGE- I Lagoon-1 490 Acres ASH DYKE STAGE -I Lagoon-2 440 Acres OVER FLOW LAGOON ASH DYKE STAGE –II 230 Acres ASH DISPOSAL PIPE LAYOUT S W 200E 400S
• 33. Ash Dyke , Area- 360 Acre, Capacity- 122 Lac Cum
• 34. Sprinklers System at Ash Dyke
• 35. Raising at Ash Dyke

Ash Handling System

SVCE undertakes complete Design, Engineering, Supply, Erection, Testing and commissioning of Ash Handling Systems. The fuels used, either solids or liquids in the production of electrical power or industrial combustion processes, produces ash which is requires different type of handling. The Process that accumulates at the bottom of the boiler, known as Bottom Ash, is generally in the form of pieces & requires mechanical, hydraulic or pneumatic conveying handling systems.

Fly Ash is dragged along by the gasses and deposited in the bottom of ash hoppers in the equipment downstream of the boiler, such as economizers, air pre heater, duct hoppers, electrostatic precipitators, stack hoppers and is normally removed in pneumatic conveying system or hydraulic systems or by conventional method using mechanical conveyors.

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Bottom Ash Systems:

• ▪ Water impounded Bottom Ash hopper with hydro jet pump or ash slurry pumps to discharge bottom ash up to ash slurry sump/ash pond or to Hydro bin.
• ▪ Dry type Bottom Ash hopper with submerged scraper conveyor for continuous discharge of ash in wet slurry form.
• ▪ Hydro bin for bottom ash storage.
• ▪ Submerged belt conveyor for continuous removal of moist bottom ash.
• ▪ Dry Bottom ash conveying.