SLAGGING PREVENTION TECHNOLOGY FOR BURNING SHENHUA COAL IN TANGENTIAL FIRING BOILERS

Shenhua coal is one of the most severely slagging coal sorts in China.The slagging prevention technologies needed to adopt for burning Shenhua coal in the tangential firing boilers have been analysed,and a comparison with corresponding slagging prevention technologies for burning bituminous coal with low ash fusing point at home and abroad being carried out.Results of comparison show that the slagging phenominon in boilers burning Shenhua coal can be effectively avoided under condition of adopting low volumetric heat capacity in the furnace,suitable mixedly burning,as well as corresponding measures in operation,such as lower temperature of the primary air,higher ratio of air to coal,the oxygen content at furnace outlet to be controlled to 3%,and the fineness of pulverized coal controlled to R906% etc..The said measures are more effective than that adopted by companies at abroad for burning bituminous coal with low ash fusing point.