15 January 2009
The pumps will be fitted to three very large coal-fired, sub-critical drum-type boilers, manufactured by Alstom Power Systems USA, totalling some 500MW output each. The contract is a follow on from the previous Stage One and Stage Two phases.Based on two BCPs operating in parallel; pump delivery is 3054.8m3/hr at 355.3°C, against a differential pressure of 1.93 bar. Specific gravity is .5739 and pump suction pressure is 196.6 bar g. The motor is a wet wound stator type and the voltage is 6.6Kv.Vic Erdilek, power market development manager at Hayward Tyler said: ‘BCPs are traditionally required for installation on either sub- or super-critical boilers, using coal as the fuelling method. On a sub-critical boiler, where traditional drum technology is used, there is a requirement for three BCPs, where two will be in continuous operation and the third on standby duty.’‘A super critical boiler incorporates a more modern type of design concept, is more efficient and environmentally friendly and operates without the traditional drum section of a sub-critical boiler. A single BCP is required for this type of boiler and is used only for start up purposes, closing down when 35–50 per cent of full load is achieved,’ he advised.A combination of pump and motor, the pumps are designed to operate at extreme pressures and temperatures, typically 340 bar g and up to 380°C.
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