ENERGY FROM WASTE
Demag cranes provide plenty of lift in China
In recent years, any number of energy-from-waste plants have been built in the UK, but inevi- tably, the scale of these facili- ties is dwarfed by those being established in the most heavily populated regions of the world. Take, for example, the Luodai Town facility, which serves the Chinese city of Chengdu, the capital of Sichuan. Chengdu has over 10.5M inhabitants, generating 3,600 tonnes of household refuse every day. The
Luodai Town facil-
ity processes some 400,000tpa of household waste, with the heat produced used to gener- ate electricity for 50,000 homes in Chengdu. The plant has an output capacity of 120M kWh. In an opera- tion of this scale, continu- ous incineration of waste materi- al is vital to the efficiency of the plant. To meet the needs of the application and the volume of throughput, the operator specified an interme- diate buffer store system, with two overhead travelling cranes, supplied by Demag Cranes & Components, for the materials handling operations. Both of the cranes have a 28.5m span, 16 t SWL and are equipped with a 10 m3 grabbing bucket. Trucks from Chengdu deliver refuse from the plant and depos- it the waste into the 19.6 x 84 sq m sunken intermediate buff- er store from one of the twelve tipping points. Once the trucks have left the operational area,
are programmed to distribute refuse evenly
“
the automatic grabbing cranes lift newly deposited material onto
existing refuse within
the store. By blending differ- ent types of waste, optimum calorific values are achieved for efficient incineration and maxi- mum heat output. The intelligent control sys- tem operates on a grid system, dividing the buffer store in to 156 zones, with the position and height of waste in each zone determined automatically. The grid system also provides refer- ence points for the automated crane system, ensuring precise positioning accuracy.
to
The cranes are programmed distribute
refuse The cranes evenly
above the 45 sq m chutes, which feed the three furnaces, ensuring constant and uninterrupted incineration. In addition to feed- ing the furnaces with up to 50 tonnes
” of waste per hour, the grab-
bing cranes are also required to perform a number of functions to blend and clear refuse. To meet the required high cycle rate, the cranes have long travel speeds of 80 m/min, with cross travel and hoisting speeds of 60m/min. They also feature an automatic load sway damp- ing system, which not only provides accurate positioning of the grab, but also eliminates the potential of damage caused by the grab colliding with the walls of the bunker walls.
Making a difference: Demag cranes
www.demagcranes.com 34 Local Authority Waste & Recycling April 2011
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