2-18　Prediction method of ash deposition in pulverized coal boilers

Abstract

In pulverized coal(PC) boilers, ash deposition can cause operational problems and heat transfer inhibition. However, it is difficult to predict ash deposition characteristics under co-combustion of low rank coal using general methods (e.g., base acid ratio or slagging factor). In this study, a new prediction of ash deposition characteristics from raw coals was evaluated with ash deposition measurement while co-combustion condition in PC boiler. Ash deposition characteristics of blending coal samples could be classified according to concentration of iron compounds in PC boiler ash samples. Furthermore, correlations of concentration of iron compounds were analyzed sulfur degradation with TG-MS, iron minerals in raw coals with CCSEM. It was confirmed that raw coals measurement with TG-MS and CCSEM could improve the prediction of ash deposition characteristics under co-combustion conditions.