Steam power plantsMore efficiency through hotter steam and heat recovery

In lignite-fired power plants, the power plant process begins with the combustion of raw lignite coal in steam generators. Here, several hundreds of tonnes of coal are burnt every hour. Steam generators in large-scale power plants develop steam power exceeding more than 2,000 tonnes an hour.
An essential aspect of lignite-fired power plants with optimised system technology (BoA) is that the pressure and temperature of the superheated steam are raised to a considerably higher level (275 bar and 580 °C) than previous power plant units. Additional heat exchangers also recover some of the heat that is still contained in the flue gases. It is used to preheat the combustion air and the water circulating in the water-steam circuit, thus increasing the efficiency.