NEW ENERGY DC C6284 & C6257 The David and Goliath of waste to energy ACCs
The first ACC was big, condensing 460 tons per hour of steam for a 120 MW power plant that converts municipal waste into electricity for the city grid. Two dozen fans, each 32ft in diameter, use clean air as the medium to condense this steam. Despite being located near the ocean, air rather than water was selected as the condensing medium, for its considerable environmental benefits. Close attention was paid to safe erection of the ACC, given the elevation of the fan drive decks, some 20m off the suspended floor below them.
The second ACC – the David of the two – is an order of magnitude smaller, producing just 2.8 MW of power. But its purpose is noble, using as its fuel source the not inconsiderable tree clippings harvested from the roadsides of this tropical island. Space constraint was an issue on this project, as the accompanying image attests. Designing the structure to accommodate this elevated ACC proved a considerable challenge.
O&G DC C7046 ACC modules for LNG expansion project
The remote location of this LNG plant demanded close attention be paid to delivery logistics. The customer was also particularly concerned that everything would fit together on arrival in Irian Jaya.
For the air-cooled condenser (“ACC”) supplied by Jord, the optimal mode of delivery was to barge the 2,500 tons of individual components to a yard located near to the site, assemble the ACC bundles and fan drive deck into modular sections and then shift these sections – 6 in total – the final few kilometres, for site erection onto Jord’s prior-delivered and assembled steel structure.
Site conditions allowed for a single hook lift only for the six main modules – each of them of 24 tubes, measuring 30m by 10m and 16m high, and weighing 300 tons – to be lifted 20m up onto the super structure.
The primary concern was to avoid deflection of the modules as they were being lifted. To meet this concern, Jord designed a cascading lift arrangement with a carefully calculated centre of gravity. The main beam of this “Modulift” spreader system spanned 20m, and added another 25 tons to the load on the crane and hook.
To ensure that everything would fit together, a Factory Acceptance Test of one complete fan module took place prior to barging the components to the assembly yard.
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