Superheater Corrosion Management in Biofuel Boilers
Permanent address of the item is
Tulistimien korroosion hallinta biopolttoainekattiloissa
Power plants using renewable fuels like biofuels or recycled fuel suffer from problems caused by corrosion in superheaters more than powerplants using fossil fuels. These problems are caused by chemical composition of renewable fuels. The composition is high in chlorine and low in sulphur. Solution for these corrosion problems developed by Metso is called Metso Fuel Diet. This solution consists of Metso Corrored analyzer, Metso DNA Corrosion Manager application, corrosion know-how and optional additive feed system. The Corrored analyzer measures the chemical composition of flue gases and Metso DNA Corrosion Manager application uses these analyzer results. This appli-cation consists of information management part and control part in automation system. The Corrored analyzer is used to measure sulfur and chlorine contents of flue gas at the superheater area of the furnace. With this information and information about tempera-tures at the superheater area a corrosion risk value is calculated. Information system offers then tools to monitor corrosion and to plan corrosion management in the plant. Plant controls in automation system were also developed to control corrosion by addi-tive feed, by fuel diet or by lowering the temperature at the superheaters. In this thesis work is first described the chemical process that causes the corrosion in the superheaters. After this, Metso DNA Corrosion Manager product is described. In this thesis work, the main focus is in information management side. A lot of focus is also given to the development of user friendly user interface. There is also a description of the pilot project made during this thesis work to Kuopion Energia Haapaniemi 3 boiler plant.