Energy-saving retrofit of boiler economizer in power plant

Economizer retrofit was carried out in a power plant for flue gas temperature increasing and economy decreasing, which was caused by small heating surface design value. Heat transfer calculation and ash fouling coefficient selection of the economizer are demon-strated. Feasible advice had been put forward and carried into execution in retrofits such as replacing economizer and raising heating surface areas of the economizer to reduce exhaust temperature. Gas shock wave soot-blower was installed according to the characteristics of ash deposition in economizer. After retrofit, the exhaust temperature has drop to the design value, ash deposition has been greatly improved, the economy of the boiler has risen consumedly, the hidden trouble of the boiler tube burst has been eliminated thoroughly, and the safety and economy of units operation has been improved.