Under operating condition of a 280 MW

the feasibility of mixedly burning lignitous coal into bituminous coal fired boiler no.6 at one power plant has been tested

the influence of proportioning ratio change for mixedly burning lignitous coal upon the operation mode of coal pulverizer

the temperature of discharged flue gas

the concentration of NOx emission

and the efficiency of boiler being studied.Results of test show that the output capacity of boiler has been certainly limited during mixedly burning ligitous coal;the temperature of discharged flue gas and the concentration of NOx emission have tendency of firstly increasing and then decreasing as the proportioning ratio of mixedly buring lignitous coal being increased;the thermal efficiency of boiler has a tendency of decrease.