Power Station Installs Verder/Naiad Dosing System

Specialist pumping solutions supplier Verder and chemical dosing expert Naiad have supplied Kilroot power station with a low-maintenance dosing solution. Kilroot power station has recently installed a Naiad copperas saturator with Verder Dura pumps to accommodate copperas crystal and generate dilute ferrous sulphate solution for dosing. Phil Kerrison, managing director of Naiad and the designer of the process, said: 'Dosing the intake water at coal-fired power stations can protect the condenser tubes against corrosion.

'The addition of ferrous iron to seawater causes an effective protective film to establish as Fe2+ is oxidised to colloidal iron, which adheres to the inside walls of the tubes,' he added. Mike Heap, sales director at Verder, said: 'With the Naiad copperas actuator now in place, the process is automatic and requires little manual intervention. 'It has performed well since it was installed some months ago and has enabled one-tonne loads of copperas crystal to be safely employed. 'At Kilroot, the one-tonne bags are lifted into position above the saturator with a crane system and copperas crystal is progressively fed into the reception tank by releasing a draw cord at the base of the bag.

'In Naiad's process, the crystal is continuously dissolved in water and dosed to the works inlet by dedicated Verder Dura pumps, with similar pumps being used to generate the dilute solution. 'The process is regulated by a digital dose controller, which is set up and operated by way of a touch-screen HMI. 'The site operator simply enters the weight of chemical delivered to the unit and starts the dosing process by processing the start button on the dosing panel.

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