ABEL HMQ – Long Distance Fly Ash Transfer

Background

The company is a leading player in Steel, Power, Mining, Coal to Liquid, Oil & Gas and Infrastructure. With environmental protection as a priority, they had to design a best available technology system to handle disposal of the ash produced by burning tons of coal. Also, the grade of coal used for power generation by this plant is “F” which ranks amongst the poorest grades having an average of 60% ash content. This, added to the fact that they had already used up most of the ash dyke area around the plant (due to using the lean slurry technology earlier) made the task for ABEL and the system supplier all the more challenging.

The Application

The proposed system involved pumping high concentrate fly ash slurry around the perimeter of the ash dyke (evaporation pond) and allowing the slurry to dewater and form a solid outer barrier, increasing capacity to accommodate more slurry to be contained in the middle. This development necessitated the pumping of high concentrate fly ash slurry, of approximately 65% solids content, through a 7km long pipeline to the ash dyke. The challenge was to find a reliable pump & system that could not only handle the flow and high pressure requirement, but also endure high abrasion while limiting costly downtime and maintenance.

The ABEL Solution

ABEL, in association with the ash handling system supplier proposed a solution wherein the ash generated would be mixed with water in a 65:35 ratio and this slurry would be transported to the ash dyke about 7 to 8 kms away.

ABEL selected Hydraulic Diaphragm Pumps (HMQ) that are designed with a hydraulic section which separates the slurry from the drive piston and isolate wear to inexpensive elastomer components. Four of these pumps are operating since 2010. Each of these has an independent 7 to 8 km discharge pipeline to the ash pond. Owing to superior design and impeccable manufacturing standards adopted at ABEL, even under these strenuous conditions, the ABEL pumps have constantly performed at their peak.

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