STEAM GENERATOR EQUIPPED WITH ECONOMIZER

PURPOSE:To increase the flow speed of feed water in the area of an economizer and improve heat transfer performance by arranging feed water flow speed increasing members between a plurality of heat transfer tubes in the area of the economizer. CONSTITUTION:Feed water flow speed increasing members 20 for increasing the flow speed of feed water 14 flowing through the area 9 of an economizer are arranged between heat transfer tubes 6 in the area 9 of the economizer. The feed water 14 flows through an annular passage 24, defined between the outer surfaces of respective heat transfer tubes 6 and the inner surface of a sleeve 21, as shown by an arrow sign 23 in a diagram and passes through the area 9 of the economizer to enter into boiling area. The flow speed of the feed water in the area of the economizer is increased by providing the flow speed increasing members between the heat transfer tubes in the area of the economizer in such a manner and, therefore, a heat transfer rate in secondary side is changed and a heat passing coefficient is increased whereby heat transfer performance may be improved.