Power Stations Endorse Impact Weighers
Two coal-fired power stations in Queensland have recently endorsed their use of Flow Force Impact Weighers with new orders.
The Millmerran power station has ordered another three units to add to the one they already have installed and the Callide Power Station has ordered one more unit to add to their three current units.
The Callide impact weighers are all used in the mixing of ash with water to facilitate dense phase pumping to the ash disposal dam. Dense phase slurry has a consistency between gear oil and toothpaste depending on the plant and ash properties and is pumped at pressures from 2000 to 6000 kPa.
This process requires tight control of the inputs as the viscosity of the slurry increases exponentially with the increase in the ash to water ratio and slurry line blockages can occur very quickly if control of the ash flow is poor. Dual ash flow paths are very desirable so that servicing of the flow valves etc can be carried out without shutting down the entire ash plant.
At Millmerran the impact weighers are used as part of the fly-ash unloading system. The weigher provides an input to the ash/water mix control logic, allowing for better dust control in loading the ash into rear dump haul trucks for disposal at the nearby mine.
The units supplied are rated for flow rates up to 500 tonnes/hour with fly ash temperatures up to 150C. They include special test weights for checking calibration and have wear resistant design using simple but effective techniques.
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Since the first Flow Force impact weighers were installed in power stations for ash handling applications in 1997, the company has enjoyed the continued approval of this and other industries for their robust designs, attention to detail and customer support. Flow Force ash handling impact weighers are installed in coal-fired power stations in West Australia, Queensland and India.
The photograph shows Flow Force production engineer Ti Kong with the next unit for Callide power station on completion of pre-delivery tests.
