Hadong Power Station
Before the introduction of FGD, the standard chimney design for KEPCO’s coal fired power stations was a 150 m / 492 ft high concrete chimney, protected internally with a sectional ceramic brick liner. The brick liner was placed directly on the inside of the concrete windshield, leaving room for only thermal insulation, but not for a ventilated air space.
The addition of FGD absorbers to all six units would create a technical problem for the old chimney design. The cool gas stream could easily penetrate through the internal brick liner and acid could condense in the narrow space between the brick liner and the concrete shell. This acid condensate would chemically attack the concrete shell and could eventually threaten the structural integrity of these chimneys.
Pennguard® linings suitable for brick and concrete
After a detailed study the Pennguard® Block Lining System was chosen for protecting all 6 chimneys.
The Pennguard® Block Lining System has the following key properties:
- A Pennguard® lining totally seals the substrate from any contact with flue gas and acid condensate.
- A Pennguard® lining is strongly insulating. As a result, it will protect a brick liner or concrete shell from high temperatures and temperature shocks.
- A Pennguard® lining is lightweight, so no supports are needed for lining installation.
- A Pennguard® lining is tolerant to small imperfections that can always be found in any ceramic brick or concrete surface.
Pennguard linings for 6 concrete chimneys in 3 different ways
For Units 1 and 2: Pennguard® linings were installed directly onto the brick liners of these existing chimneys.
Units 3 and 4: These chimneys were designed to have brick liners, but these were not installed. Pennguard® linings were installed directly onto their concrete shells.
Units 5 and 6: These chimneys were designed to receive lightweight Pennguard® linings directly on the inside of the concrete shell.