In response to the national policy requirements

a 660 MW coal-fired generating unit completed ultralow emission reform. A low-temperature economizer was installed between the air preheater and the ESP

so the desulfurization absorber's spray layer and the demister was optimized. A WESP with rigid plate was installed behind the FGD absorber

at the same time

the induced draft fans and booster fans were combined

and the low nitrogen burner with high efficiency and the grading economizer technology were also employed. A cost evaluation model was built

based on the actual operating cost data

the influence of the reform on the power supply cost was obtained. By performance test and model analysis

the results show that the above-mentioned innovative technologies and equipments can significantly reduce the emission concentration of the flue gas pollutants. The cost of electricity is increased by 0.008 47 yuan/(k W·h) after the reform.