| 摘要 |
A process and apparatus for operating a steam power plant having a coal-fired steam generator, in which at least two partial air streams are heated by means of the exchange of heat in at least one exhaust gas/air heat exchanger with hot exhaust gases that are obtained in the steam generator by the combustion of coal. The coal is dried in a milling-drying system with a first partial air stream of the heated air supplied as a primary air stream and a second partial air stream of the heated air is supplied to the steam generator as a secondary air stream for the combustion of the coal. The secondary air stream is preheated in an air/air heat exchanger upstream from the exhaust gas/air heat exchanger, with respect to the direction in which the secondary air stream flows, by the exchange of heat with the heated primary air stream.
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