Experiments on unit safety

pulverizing system capacity

furnace slagging

boiler efficiency and unit load of a 300MW unit direct blowing bituminous coal fired boiler

after it burned the mixture fuel blended with lignite.The results show that:with an increase in lignite proportion

the auxiliary power consumption rate increased and the boiler efficiency dropped

but both within a small range;such countermeasures as changing the oxygen content

adjusting the burner angle

regulating the pulverizer blending mode

and reasonably soot blowing can enhance the unit efficiency and reduce the auxiliary power consumption rate after co-firing with lignite.Supposing the lignite proportion was 20%

the unit can save fuel cost of about 1.7×108 yuan per year

on the premise of no increase in maintenance cost.