Study of ash deposits on the outer surfaces of convective tubes in a low-power solid fuel boiler

This study presents the results of an investigation into the state of ash deposits on the surface of circular cross-section pipes in the convective sections of two hot-water heating boilers, model KVu-1.0 (manufactured by Baltkotlomash LLC, St. Petersburg), each with a thermal capacity of 1.0 MW. The boilers were operating on long-flame coal with a granulometric composition of 20–50 mm. The physical properties of the ash deposits and the factors influencing their formation on the pipe surface during boiler operation are briefly described. Based on the results of in-situ measurements of deposits formed during the 2023–2024 heating season, the growth of tube ash deposits was analyzed. The shape of the ash deposits is presented through graphs depicting their cross-sectional projection on convective tubes with a diameter of 48 mm.