Cold casing duct systems are the modern approach to the need of power plants to be cycling more frequently.
DEKOMTE has developed many solutions for cold duct systems, with the emphasis on integration into the duct design. The adjacent duct internal insulation, cladding and flow plate arrangement need careful attention to ensure no gaps of interface.
The insulation system is the most important point. There must be a seamless insulation between the duct and the expansion joint bolster.
The steel frame upstand of the expansion joint must not be heated by the flue gas, after compression and degradation of insulation.
DEKOMTE has retrofit and OEM solutions which will meet the operational criteria required.
DEKOMTE fabric expansion joint 10W as base load solution - suitable for GT applications with cold casing exhaust system
DEKOMTE Membrane expansion joint ME suitable for changeover from hot to cold casing exhaust system with large duct movements
DEKOMTE High tech expansion joint 3WA as cycling solution - suitable for changeover from hot to cold casing exhaust system with large duct movements and high cycling impact
|Dimension inside||7000 x 8000 mm|
|Temperature||max. 670 °C|
|Movement||axial: -200 mm
lateral: 100 mm
|Thermal transient||cyclic operation|
|Maximum stress||400 N/mm²|
|Load cycles||250 000|
Example of operating parameters for the cold casing design of a fabric expansion joint