Eighteen Nos per unit Apparatus Flushing Boxes of capacity 2.5 T/hr. for Eco. Hopper, 1.25 T/hr for Eco. Hopper bypass and 2.5 T/hr for Air Preheater Hoppers shall be designed to effectively transport the ash in slurry form to slurry pipe/trench.
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The flushing apparatus shall be provided with jetting nozzles at strategic points, in order to form thorough slurry and to prevent the ash particles from settling. The ash slurry formed shall be led to an intermediate transfer tank through an adequately sized discharge/over flow pipe.
The design shall ensure a water seal against atmospheric air leakage into economizer ash hoppers at the time of ash removal. Approx. 260 mm water seal will be maintained, however the exact figure shall be known after the Boiler supplier is finalised and confirmed to successful bidder.
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The dimensions of different parts shall be designed for the intended service with sufficient margin. The flushing apparatus shall be installed under the economizer hoppers at elevations. The temperature of ash at economizer ash hoppers is 350°C.
Flushing apparatus shall be provided with necessary steel support base, insert plates etc. for mounting installation.
This document provides information about dry ash evacuation and the high concentration slurry disposal (HCSD) system used at NACO CPP. It describes the types of fly ash generated and how they are evacuated. The HCSD system conveys highly concentrated ash-water slurry to ash ponds, using reciprocating pumps. This allows for lower water usage and easier ash disposal compared to traditional lean slurry systems. Key components of the HCSD system like silos, mixing tanks, pumps and controls are also outlined.
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