Castle Peak power station

Largest coal fired power station in Hong Kong fits FGD and installs PennguardTM linings in 250 m high chimney with four flues.

CLP Power, a subsidiary of China Light & Power, is the leading supplier of electricity in Hong Kong. CLP Power’s Castle Peak Power Station has a combined installed capacity of 4,108 MW. It is located across the water from Chek Lap Kok International Airport and it is one of the largest coal firing power stations in the world.

The Castle Peak B Power Station consists of four 677 MW units that were commissioned between 1985 and 1989. Running at over 38% efficiency at full load, the Castle Peak B units are a key generating asset for the Hong Kong economy.


In recent years, the rapid industrialization of Southeast Asia and the Hong Kong region in particular has affected the air quality in and around Hong Kong. To help improve air quality, it was decided in 2006 that all four units of Castle Peak B Power Station should be equipped with highly efficient flue gas desulphurization plants.

The four units of Castle Peak B use a common 250 m high chimney, which contains four steel flues within a reinforced concrete windshield. The steel flues were originally constructed without an internal lining. CLP Power recognized however that following the FGD retrofit, the flue gas temperature would drop well below its acid dewpoint, resulting in the need for a chimney flue lining system.

Following an evaluation of different chimney flue lining technologies, CLP Power selected the PennguardTM Block Lining System, using 51 mm thick PennguardTM Block 55. PennguardTM linings were installed in all four flues during planned boiler outages in 2008, 2009 and 2010.