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Press Releases Flender Gear Units Help Power China
The project is for a coal-fired power station in Sichuan Province, and features special combination Motox and Cavex units. The input is from two inverter-controlled motors (main and standby), which are flange mounted onto two Motox ZF 108 in-line primary helical gear units. These primary drives are flange mounted onto a Cavex CDDA 500 double reduction worm gear unit with special twin input stages. The whole drive unit is shaft mounted onto the driven shaft and fixed by means of a shrink disc connection. This combined drive arrangement gives an overall drive ratio of 1563/1, thus achieving a nominal output speed of 1rpm with the 4-pole motor running at its normal speed of around 1500rpm. As this is a shaft mounted drive unit, special consideration had to be given to the torque restraint mechanism. Due to the temperatures involved in the driven equipment, the driven shaft grows several millimetres in length during operation. This means the torque restraint mechanism has to be capable of ‘floating’ due to the thermal growth of the driven shaft. The drive units are fitted onto Howden rotary regenerative gas heaters at Guang’an Power Station. Each boiler has been fitted with a flue gas desulphurisation plant, which removes sulphur dioxide (SO2) from the boiler flue gases, to reduce the formation of acid rain. The Howden reheaters boost the temperature of the flue gas leaving the wet scrubber, to increase gas buoyancy and aid dispersion into the atmosphere. Each reheater is basically a large wheel containing over 100,000 enamelled steel plates, which remove heat from the hot gas and give it up to a colder gas as the wheel rotates at around 1rpm between the two gas streams. The rotating weight of one reheater is 160 tonnes, and the total weight, including casing and supports, is over 250 tonnes. The start-up date for the power station is scheduled for the fourth quarter of 2004. More information on Flender gear units for heavy industry is available from Flender Power Transmission on tel +44 (0)1274 657700, fax +44 (0)1274 669836 or e-mail info@siemens.com ENDS For further media information please contact Bridget Summers, Footprint, PO Box 4, Colton, Leeds LS15 8WX, UK. Tel: 0113 251 5697. Fax: 0113 251 5351. E-mail: bridget@fim.org.uk |
Flender
Power Transmission is supplying two size 500 drive units in a special combination
for Howden Power’s project in Guang’an, China.