Lean Slurry Disposal System and Ash Water Recovery System have been conventionally used for disposal of ash slurry in dilute form, generated at various power plants and are still in demand. Macawber Beekay offers such systems which comprise of centrifugal slurry pumps for disposal and clarifloculator / tube settler for recovery of the ash water from slurry pond.
Conventional Lean Slurry Disposal System and Ash Water Recovery System have limitations/disadvantages on account of higher amount of water wastage/contamination, ground water pollution, potential threat of ash pond collapse, vast land required for ash dykes, higher costs for ash pond construction and higher power consumption. These limitations have led to the adoption of new environment friendly ash disposal technologies like High Concentration Slurry Disposal (HCSD) Systems. Macawber Beekay has been a pioneer in adopting the best of this technology by commissioning HCSD System for a combination of fly ash and bottom ash, a first of its kind in India.
HCSD System comprises of controlled and monitored feeding system for fly ash & bottom ash followed by a homogenous mixing in an adequately designed Agitator Retention Tank (ART) and further pumping to disposal area through the piston diaphragm / hydraulic piston pumps. HCSD system operates on a higher concentration of about 60%, that’s why the water consumption is drastically reduced and literally no water is released at the disposal area. The ash slurry disposal takes placed based on a sloped disposal concept thereby it spreads and solidifies, leaving hardly any residual ash to fly off. The system has unique advantages of less land area requirement, lesser leaches in the disposal area, low velocity system, lesser size pipes and less power consumption.
Proper monitoring of the slurry properties is the key to success of the system. HCSD pump transports the high concentrated slurry from the ART to the ash disposal area through carbon steel pipelines. These pumps have mechanism for capacity variation depending on the characteristics of the slurry. De-blocking facility is also considered either by the HCSD pump itself or through a separate water pump. Pigging system is also provided for cleaning of the pipeline. MBL’s HCSD systems are installed upto a capacity of 315 M3/Hr and for distance upto 17 KMs.
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