Drive units set for Chinese power plant
A
Siemens Flender product story
Edited by the Engineeringtalk editorial team
Feb 13, 2004
Flender Power Transmission is supplying two size 500 drive units in a special combination for Howden Power's project in Guang'an, China.
Flender Power Transmission is supplying two size 500 drive units in a special combination for Howden Power's project in Guang'an, 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 inline 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 1rev/min with the four-pole motor running at its normal speed of around 1500rev/min.
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 160t, and the total weight, including casing and supports, is over 250t.
The startup date for the power station is scheduled for the fourth quarter of 2004.
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