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During incineration in power stations and waste incineration plants, considerable quantities of fly ash are generated, which must be removed prior to the release of the flue gases into the atmosphere. This ash is solid matter with particle sizes of between 0.1 µm and 1 mm, depending on the type of combustion.
The problem here is posed not only by the small, in some cases submicron particle sizes, known as fine dust or particulate matter, which present a considerable health hazard. Another problem is the fact that the dust may contain other pollutants such as mercury, which could pollute the groundwater or soil when deposited in the environment. The dust must therefore be removed before the flue gas enters the atmosphere through the stack. The removal of dust from gaseous material is carried out by Steinmüller Babcock Environment using the latest technologies: electrostatic precipitators or fabric filters. Both filter types reliably achieve high levels of removal rates - using different separation principles.
Electrostatic filters achieve dust separation levels of over 99.95% for large quantities of flue gas, while generating only minor pressure losses. The technology is robust and reliable and is suitable for coal-fired power stations, waste incineration plants or biomass-fired boilers, but also for all areas of industrial plants in which particles must be removed from exhaust gases. Electrostatic filters that are used for product recovery are especially important, since they make a valuable contribution to conserving resources. Some of these industrial sectors include cement plants, coal processing plants and chemical and petrochemical plants. To separate very fine dust, drops and aerosols, we use special wet electrostatic precipitators.
The electrostatic filters are always designed individually for each specific application. Steinmüller Babcock Environment can safely meet all kinds of different demands thanks to its decades of experience, with more than 400 reference plants all over the world.
Fabric filters are usually used when the electrical dust resistance does not allow the economic use of electrostatic filters, or if additional physical/chemical separation tasks must be achieved in the filter cakes which are built up on the filter bags. Examples include the adsorption of mercury on activated carbon or the separation of acidic flue gas components from calcium based absorbents.