Combustion processes

Flue-gas problems vanish into thin air

The combustion of wood, coal, waste, and recyclable materials can produce many and various pollutants with a great potential of danger. GEA Deichmann dust-collection systems produce results that are considerably within the legally stipulated limit values.

The combustion of wood is divided into 3 phases: drying, degasification (pyrolysis), and combustion. With respect to the efficiency of combustion and pollutant emission, special attention must be directed to oxidation. Wood is a long-flame fuel. Approximately 70% of the energy chemically bound in wood is released during oxidation of the gases of combustion. If this process does not take place optimally, this leads to exhaust gases with great amounts of pollutant. This also produces organic substances that are not readily volatile: e.g., soot and tar, which must be filtered out of the air.

Flue gas is also a problem. It occurs in the processes of combustion in power plants and in waste incineration plants, and in industrial production processes. The exhaust gases contain pollutants such as carbon monoxide, nitrogen oxides, hydrocarbons, soot, and heavy metals. These toxic substances can be bound with the aid of additives and can be filtered.

The supply of air of combustion plays a major role in determining the quality of combustion and the efficiency of plant operations. Cyclone air filters, in the form of single or multiple units, are often used for the removal of dust from flue gases. Filtration separators (for example, fabric bag filters) are also used for this purpose. Air Treatment delivers systems with filter media that resist temperatures up to 260°C, and that are not sensitive to sparking. Residual dust contents are minimal.
These solutions satisfy limit values of the new versions of the German Technical Regulations for Air-Pollution Control (TALuft), without the need for further technical measures.