The Clyde Bergemann DRYCON GmbH focuses on Solutions to extract hot materials such as bottom ash from utility boilers dry.

The DRYCON System is a complimentary world-class product added to the product portfolio of the Clyde Bergemann Power Group. DRYCON extents the bottom ash extraction product portfolio, which includes submerged scraper conveyors and pneumatic extraction systems, by the dry mechanical extraction solution DRYCON. Over many years of extracting bottom ash only wet, the industry has experienced, that there is a wide range of applications, where the wet bottom ash extraction process can be safely replaced by a dry extraction process. Dependent on the quality and quantity of bottom ash, it is absolutely advantageous to introduce a DRYCON system for dry bottom ash extraction.

THE PROCESS

The DRYCON system is mounted fully sealed to the combustion chamber. The negative pressure inside the boiler sucks air in a controlled manner mainly at the top end of the DRYCON system into the DRYCON system. This air travels in counter flow direction along the surface of the ash, which rests on the conveyor belt. This activates a re-burning process of the glowing ash, which reduces the unburned carbon level and frees up additional thermal energy. The air is heated up before it enters the combustion chamber and adds additional thermal energy to the steam generating process inside the boiler.

THE KEY ADVANTAGES

• 1. NO NEED OF WATER: No water for ash cooling and more important no water treatment at all is necessary, which eliminates investment and reduces operational & maintenance cost and provides additional space inside and outside the power station.
• INCREASE of EFFICIENCY: By the additional introduction of hot air, more thermal energy is made available for the steam generation process.
• ADDITIONAL REVENUE BY BOTTOM ASH UTILIZATION: Milled to a fine grain size the Bottom Ash can be sold together with the Fly Ash in the Cement Industry.
• ENHANCED QUALITY of the BOTTOM ASH: The unburned carbon of the bottom ash will be reduced.
• REDUCTION of BOTTOM ASH QUANTITY: Due to the air intake, the fine ash, also produced by the re-burning process, will be sucked into the boiler and discharged as Fly Ash.