Approach for Determining Soot-Blowing Frequency Based on the Decreasing Behavior of Heat Flux during Ash Deposition Determined in 1.5 MWth Pilot Plant Tests

Abstract

To obtain practical knowledge in operating soot-blowers without ash related problems, a series of slagging tests have been conducted at 1.5 MWth pilot plant and the rates of decreasing heat fluxes through the test probe simulating the water-wall have been determined. In this study, initial heat flux, this heat flux decreasing rate, and the heat flux at which decreasing heat flux rate is reduced are employed to predict the soot blowing time. A simple equation is obtained for predicting the soot blowing timing. Discussion is made on the derivation of the equation, and it is expected that the derived equation holds for any furnace.