Category: Blog

In the cleaning of soot and fly ash from the combustion plants, much has changed in the history. While the ancestors had to deal mainly with soot in the flue gas, the present-day furnaces are mainly confronted with fly ash in the flue gas thanks to the controlled firing. The «soot», resulting from insufficient combustion is not known to modern combustion technology, because this organic carbon content is burned out to the state of inorganic residue, namely to the fly ash.

A waste incineration plant uses the energy contained in waste to produce steam, which in turn is advantageously converted into electrical energy.

Swiss Krono - a successful manufacturer of MFB boards and OSB boards - uses only natural raw materials that come from sustainably managed forests. In 2002 a biomass combustion plant was put into operation for the energetic utilization of various production waste, dust and bark.

Each combustion of organic substances produces particles, which are discharged with the flue gas. These particles, called fly ash, fly through the boiler with the flue gas and settle down on the inner boiler walls and the heat exchanger tubes of the boiler. This results in a reduction of the heat transfer. These contaminants are removed by means of various cleaning systems. The most important automatic online cleaning methods are described below.

High fly ash load in the flue gas of waste and biomass incineration boilers causes deposits on the tube bundle heat exhange surfaces. To meet the boiler efficiency and to maintain the required temperatures of the downstream located plant components, the tube bundles must be cleaned periodically. In order to achieve the most constant possible conditions and for safety reasons, the cleaning should be carried out online during the boiler operation and without any personal intervention in the boiler. The cleaning procedures practiced in the plants are described below.

240.000 Tons of natural wood are being processed each year in the biomass boiler located in Nesle (France), where they are being converted into renewable electricity (130 GWh/year), process heat (220 GWh/year) and cooling water (2 GWh/year). The owner AKUO Energy and the operating company CNIM EB hence contribute since 2013 to a reduction of the CO2-emissions of the local industry.