FIELD: methods and devices for utilization of residual heat, in particular, excess heat in flue gas (5) that is not required for operation of desulfurization plant of flue gas 8 admitted to the air heater and electrostatic precipitator (7). SUBSTANCE: air heating is accomplished by two air heaters (3,4) located in the main line of flue gases before and past electrostatic precipitator (7), and a partial flow (5a, 5c) of flue gas (5) corresponding to excess heat and used for steam generation is abstracted at least from one air heater (3,4). EFFECT: facilitated procedure. 10 cl, 2 dwg
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