Clyde Bergemann will deliver the bottom ash handling systems using its DRYCON solution for Mitsubishi Hitachi Power Systems, which is responsible for the ultra-supercritical boilers at the plant.
The deal also includes the crusher station, transfer conveyor and system controls. Delivery of the both systems is scheduled around the end of 2019.
“This order marks an important step with regards to the acceptance of the DRYCON technology in Asian markets”, said Dr Christian Mueller, President of Clyde Bergemann Power Group.
He added: “We are also proud and pleased to be awarded the contract by MHPS – our first joint dry bottom ash handling project.”
Clyde Bergemann’s solution consists of a fabric compensator and a transition hopper, isolating gates with jaw crusher function, the DRYCON steel plate conveyor, a crusher station and a transfer conveyor for each of the two units.
To absorb the axial and lateral expansion of the boiler, the heat-resistant fabric compensator is directly attached to the combustion chamber and collection hoppers below catch the hot bottom ash.
Each hopper leg is equipped with a grating and a hydraulic-driven crusher combination at the outlet, which shreds oversized particles.
The jaw crushers can also be used to seal off the boiler from the DRYCON. The bottom ash hoppers can serve as short-term storage for up to eight continuous hours of boiler operation.
The hoppers are followed by the DRYCON steel plate conveyor that automatically transports and cools the bottom ash utilising air only. Clyde Bergemann explained that DRYCON draws ambient air along the conveyor and in counter flow to the hot ash, effectively transferring heat back into the boiler.
A bifurcating (branched) chute feeding the ash into crushers is fitted below the DRYCON conveyor head. The crushers are built in redundancy – when one is operational, the other is in standby mode as a backup.
A subsequent conveyor transfers the cooled bottom ash to the silo.
Clyde Bergemann added that the DRYCON technology “usually replaces the need for a second conveyor and is capable of transporting the material directly to the silo with an incline of up to 45 degress. In this case the silo was located offset the center line of DRYCON and therefore needed a further transfer conveyor to meet site requirements.”