STEEL BELT CONVEYORS FOR SEVERE CONDITIONS since 1929

CHUBU ELECTRIC+TEPCO

THE CHALLENGE

Until 2011, Japan had generated 30% of its electrical power from nuclear reactors and planned to increase that share to 40%. Nuclear energy had been a national strategic priority in Japan. After the Fukushima Daiichi nuclear disaster, which happened on 11 March 2011 due to the tsunami generated by one of the biggest undersea earthquakes ever, all Japan's nuclear power plants were closed for safety reasons. This decision led to an increase in the consumption of fossil fuel and consequently to a wave of new green coal plant constructions.
Japan is planning to build more than 30 new green coal-fired power generation units in the next decade or so.
Magaldi Power (MP), together with its Japanese licensee Kawasaki Heavy Industries (KHI), is taking part in this ambitious plan. Since 1999, in Japan MP and KHI have been able to place 7 MAC® (Magaldi Ash Cooler) systems: the dry bottom ash technology capable of handling and cooling the bottom ash without making any environmental impact. The MAC® system has already been recognized as the best available technology for green coal-fired power plants.
Hitachinaka #3 was the first project that MP and KHI received in March 2015. The commercial operation of this Unit is scheduled for the end of 2020. Currently, it is still in the design stage.

 

THE CUSTOMER

Hitachinaka Generation Company is a subsidiary of the Chubu Electric Power Company with TEPCO holding a 3.45% stake. The Company was founded in December 2013 as a vehicle for building the new 650MW ultra-supercritical plant (Unit #3) at the existing Hitachinaka Thermal Power Station.

 

THE SOLUTION

The technical solution to be applied for Unit #3 at the Hitachinaka power station provides the installation of a MAC® extractor connected to the boiler via a mechanical expansion joint and a transition hopper equipped with hydraulically-operated bottom doors. Downstream the MAC® extractor, a crushing stage reduces the bottom ash grain size down to 80 mm for further conveyance to a clinker tank through a Postcooler conveyor. From the clinker tank the bottom ash is dosed to 2 vibrating rod mills (1x100% stand-by) to reduce its size to below 500 microns and then pneumatically conveyed to the final storage silo.

 

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