Macawber Beekay’s product profile includes Vacuum System for extraction of dry fly ash collected at ECO / Air Pre-Heater / Duct / Electrostatic Precipitator hoppers of PF type boilers.
Vacuum System is generally adopted when the extraction distance is less, numbers of ESP hoppers are more and plant layout demands two-stage conveying. Vacuum System includes conveying of fly ash from various fly ash hoppers up to the intermediate / buffer / surge hopper (ISH) located near ESP. A second stage system - positive pressure system is employed to convey fly ash from ISH to main fly ash Silo(s).
Vacuum system envisages conveying of dry fly ash from ash hoppers by vacuum pumps and collection in ISH. Each vacuum pump, dedicated to a stream, can convey both coarse and fine ash. The vacuum conveying system operates so as to allow sequential ash discharge from ash hoppers into conveying stream which is in continuous operation.
Macawber Beekay’s product profile includes Jet Pumping System for intermittent removal of bottom ash collected at furnace bottom of PF type boilers. System comprises of water impounded refractory lined Bottom Ash Hopper of adequate capacity with water seal trough and dip plates, allowing free expansion of the furnace without any air ingress.
Bottom Ash Hopper is of structural steel, complete with hydraulically operated feed gates, refractory lining along with its cooling arrangement, hopper overflow, water seal boxes, sluicing headers with nozzles, seal trough overflow connection, access doors, inspections glass windows, poke holes and supporting steel structuring platforms, stairs and accessories.
Intermittently, de-ashing is done through operation of the inclined hydraulically operated feed gates, clinker crushers and jet pumps. High pressure water supplied to Jet Pumps act as motive water to pump the bottom ash slurry to dewatering bins/slurry sump for further disposal.
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