Experimental Study on Combustion Characteristics of Blend coal in Thermal-balance and Recommendations Type Selection of Ultra-Supercritical Boiler

The ignition stability and burnout behaviors of the blend coals to be used in the 2 × 680 MW ultra-supercritical boilers of second stage project of Xisaishan Power Generation Co. Ltd are analyzed by using the thermal gravimetric analyzer. The results showed that the ignition and combustion stability of the design coals were not nice and the coals were difficult to be burnt out. At the meantime, according to the combustion behavior of the blend coals, the primary suggestions for type selection of boiler equipments and the selection of operating parameters were proposed. Analysis of the combustion behaviors of the blend coals to be used in the boiler and adaptability of the boiler to coal rank variations indicated that the tangential firing is a better choice for the boiler.