Directing against problems of high leakage rate on “three kind pipes”

as well as unstable combustion

corrosion and air leakage of heating surfaces

and low heat efficiency of boiler No.2 in thermal power plant under Qilu Petrochemical Company

technical retrofit of the waterwall

the economizer

and the air preheater has been carried out. After retrofitting

leakage problems of “three kind pipes” have been thoroughly resolved

enhancing heat efficiency of said boiler to 91%

annual comprehensive economic benefits reaching 10.22 million yuan (RMB).