The invention relates to a boiler device (1) comprising: - a circulating fluidized bed boiler (5), in which a combustion is used for producing steam, - a high pressure turbine (2) in which enters the steam produced in the boiler (5), - a middle pressure turbine (3) in which is supplied steam from the high pressure turbine (2), characterized in that the device (1) further comprises a heat exchanger for transferring heat from steam flowing upstream the high pressure turbine (2) to steam flowing between the high pressure turbine (2) and the middle pressure turbine (3).
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