Abstract:

Abstract:Some problems occurred during the operation of a certain 600MW subcritical Wflame boiler, such as the higher attemperating water volume of boiler superheater, lower steam temperature of reheater and overtemperature of exhaust gas,etc.,which were compared with the design values.Through analyzing, it was discovered that main reasons of the problems are the structure characteristics of the boiler and the variation of coal quality.In addition,the heating surface transformation scheme was confirmed and evaluated by thermal performance checking calculation. After the transformation,the operation economy of the unit was improved on the basis of reliability.

Key words: Keywords:W flame boiler, superheater;reheater, attemperating water, temperature of exhaust gas, thermal performance checking calculation