Several problems occurred in Fukang thermal power plant

such as high NOxemission

severe boiler coking and fouling

and insufficient drying capacity of pulverizing system

during the onversion to Zhundong coalfiring.To solve these problems

various measures were taken

like using deep air-staged combustion technology

arranging burners in small tangential forms

adding new soot blowers around the easy-coking and contaminated regions

enhancing the primary air temperature through high-temperature flue

an so on.After the retrofiting

with the NOxemission of below 200mg/m3

the boiler can run continually at high load by firing Zhundong coal only

and the boiler efficiency can reach up to 92.50%

about 0.8%higher than that before the retrofitting.