Dunamenti power station
Some 30 kilometres from Budapest, near the town of Szazhalombatta, lies Hungary’s largest power plant. With its 10 boilers and an installed capacity of well over 2.000 MW, the Dunamenti power station supplies 20 % of the country’s electricity. In addition, Dunamenti power station supplies district heat to the town of Szazhalombatta and process steam to the nearby refinery complex, MOL.
The base load capacity of the Dunamenti power station is made up of six oil fired boilers, rated at 220 MW each. The fuel for these units is a heavy residual oil from the neighbouring MOL refinery. This fuel presents a number of technical challenges and one of the most important is corrosion, which can affect the boiler and all downstream equipment in contact with the corrosive flue gas.
Electricity demand in Hungary will grow considerably over coming years and the immediate concern for the Dunamenti management is to ensure the best possible availability of the power station. To achieve this, modern burners are being installed on the oil fired units, which will improve economical as well as environmental efficiency.
At the same time, the Dunamenti power station is solving a serious corrosion problem in its chimneys. There are two, 200 metre high concrete chimneys, each with three internal steel liners.
Although the exhaust gas temperature is 150-160 °C, the steel liners are under strong acid attack in many places, especially around ‘cold spots’.
In 1994 Karrena GmbH, the German chimney builder (in cooperation with Kraftszer Budapest) introduced the PennguardTM Block Lining System to the power station and in that same year, the first steel liner was repaired and partially (540 m²) lined with PennguardTM. In 1995 and 1997, the same repair method was used for a further two steel liners and recently, in March 1998, the fourth liner was protected with PennguardTM. The power station currently has almost 2.200 m² of PennguardTM linings in use.