The effect of biomass co-combustion in a CFB boiler on solids accumulation on surfaces of P91 steel tube samples

• Published in: Biomass & bioenergy 2016-02, Vol.85, p.61-68
• Main Authors: Opydo, Michał, Kobyłecki, Rafał, Dudek, Agata, Bis, Zbigniew
• Format: Article
• Language: English
• Subjects: Biomass; Co-combustion; Large-scale CFB; P91 steel; Solids accumulation
• ISSN: 0961-9534; 1873-2909
• DOI: 10.1016/j.biombioe.2015.12.011

The paper describes the results of industrial tests associated with the co-combustion of biomass and agromass with coal and focused on diagnostics and assessment of the effect of fuel type on the accumulation of solids on the surface of P91 steel tube samples placed in the vicinity of steam superheater in a commercial large-scale (over 400 MW) circulating fluidized bed boiler. Analysis of samples indicated the effect of fuel type, as well as the location of the area on the steel tube on the rate of solids accumulation. Alkali compounds were quite uniformly distributed at both front and rear sections of the steel tube samples, while calcium and sulfur components were mainly found in the front area. The average solids accumulation rates calculated for the rear areas of P91 steel tube samples were roughly two times higher than those for the front ones. The highest solids accumulation rate on the front area (1.04·10−9 ms−1) was calculated for the case of agromass co-combustion with coal. [Display omitted] •Simple technique was demonstrated to investigate ash accumulation on steel tubes.•Solids accumulation on the rear area are almost two times higher than on the front.•The highest ash accumulation rate on the tube was calculated for agromass.