The circulating fluidized bed(CFB) boiler of supercritical 600 MW unit of Romania Rovinari is designed to burn Pinoasa coal

Rosia coal and Tismana coal.In this study

the physical and chemical analysis of these three kinds of lignites are investigated

and the combustion characteristics

emission characteristics

coking characteristics and ash characteristics are also studied in the 3 MW CFB thermal test bench.The experimental results show that the three designed fuels are young lignites with high moisture

middle-and high-sulfur content

high volatile

low ash melting point and low calorific value.And the content of CaCO_3 in limestone is 96.8%.Besides

three kinds of fuels used in CFB combustion have great combustion stability and safety

and there is no risk of coking

slagging and contamination at the designed bed temperature.In addition

these fuels have strong burst properties

excellent ignition

great burnout characteristics and low pollutant emissions

which are very suitable for CFB combustion.