Returning energy of steam, in exchanged form, to process, e.g. use of exhaust steam for drying solid fuel or plant

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Using steam or condensate extracted or exhausted from steam engine plant (for heating feed-water F01K7/34; returning condensate to boiler F22D ) > Returning energy of steam, in exchanged form, to process, e.g. use of exhaust steam for drying solid fuel or plant