Abstract: According to the problem of high gas temperature of 300-MW CFB boilers, several innovations are made during overhauling. First, extended walls are added to the water-cooled walls. Second, the length of soot-blowers for high-temperature superheaters entering the furnace is shortened, and another group of soot-blowers is installed on the opposite side of the existing soot-blowers. Third, low-pressure economizer is installed, and finally, additional regenerative components are installed in the air preheater. After such modifications, the gas temperature is reduced by 16℃ with the heat consumption rate reduced by 42.31 kJ/(kW·h) and the gross coal consumption rate reduced by 1.6 g/(kW·h). The innovations yield excellent results in energy conservation.

Key words: 300-MW generating unit, CFB boiler, energy conservation, innovation